- 08 Nov, 2016 40 commits
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Richard Weinberger authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit 23654188 upstream. When Fastmap is used we can face here an -EBADMSG since Fastmap cannot know about unmaps. If the erasure was interrupted the PEB may show ECC errors and UBI would go to ro-mode as it assumes that the PEB was check during attach time, which is not the case with Fastmap. Fixes: dbb7d2a8 ("UBI: Add fastmap core") Signed-off-by:
Richard Weinberger <richard@nod.at> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by:
Tim Gardner <tim.gardner@canonical.com>
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Gavin Shan authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit 5adaf862 upstream. This fixes the warnings reported from sparse: pci.c:312:33: warning: restricted __be64 degrades to integer pci.c:313:33: warning: restricted __be64 degrades to integer Fixes: cee72d5b ("powerpc/powernv: Display diag data on p7ioc EEH errors") Signed-off-by:
Gavin Shan <gwshan@linux.vnet.ibm.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Signed-off-by:
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Gavin Shan authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit a7032132 upstream. The hub diag-data type is filled with big-endian data by OPAL call opal_pci_get_hub_diag_data(). We need convert it to CPU-endian value before using it. The issue is reported by sparse as pointed by Michael Ellerman: eeh-powernv.c:1309:21: warning: restricted __be16 degrades to integer This converts hub diag-data type to CPU-endian before using it in pnv_eeh_get_and_dump_hub_diag(). Fixes: 2a485ad7 ("powerpc/powernv: Drop PHB operation next_error()") Suggested-by:
Russell Currey <ruscur@russell.cc> Signed-off-by:
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Gavin Shan authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit d63e51b3 upstream. The PE number (@frozen_pe_no), filled by opal_pci_next_error() is in big-endian format. It should be converted to CPU-endian before it is passed to opal_pci_eeh_freeze_clear() when clearing the frozen state if the PE is invalid one. As Michael Ellerman pointed out, the issue is also detected by sparse: eeh-powernv.c:1541:41: warning: incorrect type in argument 2 (different base types) This passes CPU-endian PE number to opal_pci_eeh_freeze_clear() and it should be part of commit <0f36db77> ("powerpc/eeh: Fix wrong printed PE number"), which was merged to 4.3 kernel. Fixes: 71b540ad ("powerpc/powernv: Don't escalate non-existing frozen PE") Suggested-by:
Paul Mackerras <paulus@samba.org> Signed-off-by:
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Anton Blanchard authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit 5045ea37 upstream. __kernel_get_syscall_map() and __kernel_clock_getres() use cmpli to check if the passed in pointer is non zero. cmpli maps to a 32 bit compare on binutils, so we ignore the top 32 bits. A simple test case can be created by passing in a bogus pointer with the bottom 32 bits clear. Using a clk_id that is handled by the VDSO, then one that is handled by the kernel shows the problem: printf("%d\n", clock_getres(CLOCK_REALTIME, (void *)0x100000000)); printf("%d\n", clock_getres(CLOCK_BOOTTIME, (void *)0x100000000)); And we get: 0 -1 The bigger issue is if we pass a valid pointer with the bottom 32 bits clear, in this case we will return success but won't write any data to the pointer. I stumbled across this issue because the LLVM integrated assembler doesn't accept cmpli with 3 arguments. Fix this by converting them to cmpldi. Fixes: a7f290da ("[PATCH] powerpc: Merge vdso's and add vdso support to 32 bits kernel") Signed-off-by:
Anton Blanchard <anton@samba.org> Signed-off-by:
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Rabin Vincent authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit f659b100 upstream. As the documentation for kthread_stop() says, "if threadfn() may call do_exit() itself, the caller must ensure task_struct can't go away". dm-crypt does not ensure this and therefore crashes when crypt_dtr() calls kthread_stop(). The crash is trivially reproducible by adding a delay before the call to kthread_stop() and just opening and closing a dm-crypt device. general protection fault: 0000 [#1] PREEMPT SMP CPU: 0 PID: 533 Comm: cryptsetup Not tainted 4.8.0-rc7+ #7 task: ffff88003bd0df40 task.stack: ffff8800375b4000 RIP: 0010: kthread_stop+0x52/0x300 Call Trace: crypt_dtr+0x77/0x120 dm_table_destroy+0x6f/0x120 __dm_destroy+0x130/0x250 dm_destroy+0x13/0x20 dev_remove+0xe6/0x120 ? dev_suspend+0x250/0x250 ctl_ioctl+0x1fc/0x530 ? __lock_acquire+0x24f/0x1b10 dm_ctl_ioctl+0x13/0x20 do_vfs_ioctl+0x91/0x6a0 ? ____fput+0xe/0x10 ? entry_SYSCALL_64_fastpath+0x5/0xbd ? trace_hardirqs_on_caller+0x151/0x1e0 SyS_ioctl+0x41/0x70 entry_SYSCALL_64_fastpath+0x1f/0xbd This problem was introduced by bcbd94ff ("dm crypt: fix a possible hang due to race condition on exit"). Looking at the description of that patch (excerpted below), it seems like the problem it addresses can be solved by just using set_current_state instead of __set_current_state, since we obviously need the memory barrier. | dm crypt: fix a possible hang due to race condition on exit | | A kernel thread executes __set_current_state(TASK_INTERRUPTIBLE), | __add_wait_queue, spin_unlock_irq and then tests kthread_should_stop(). | It is possible that the processor reorders memory accesses so that | kthread_should_stop() is executed before __set_current_state(). If | such reordering happens, there is a possible race on thread | termination: [...] So this patch just reverts the aforementioned patch and changes the __set_current_state(TASK_INTERRUPTIBLE) to set_current_state(...). This fixes the crash and should also fix the potential hang. Fixes: bcbd94ff ("dm crypt: fix a possible hang due to race condition on exit") Cc: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by:
Rabin Vincent <rabinv@axis.com> Signed-off-by:
Mike Snitzer <snitzer@redhat.com> Signed-off-by:
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Mike Snitzer authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit f10e06b7 upstream. If pg_init_retries is set and a request is queued against a multipath device with all underlying block device request_queues in the "dying" state then an infinite loop is triggered because activate_path() never succeeds and hence never calls pg_init_done(). This change avoids that device removal triggers an infinite loop by failing the activate_path() which causes the "dying" path to be failed. Reported-by:
Bart Van Assche <bart.vanassche@sandisk.com> Signed-off-by:
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Minfei Huang authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit 8dc23658 upstream. dm_resume() will return success (0) rather than -EINVAL if !dm_suspended_md() upon retry within dm_resume(). Reset the error code at the start of dm_resume()'s retry loop. Also, remove a useless assignment at the end of dm_resume(). Fixes: ffcc3936 ("dm: enhance internal suspend and resume interface") Signed-off-by:
Minfei Huang <mnghuan@gmail.com> Signed-off-by:
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Bart Van Assche authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit 3b785fbc upstream. This avoids that new requests are queued while __dm_destroy() is in progress. Signed-off-by:
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Adrian Hunter authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit 3bccbe20 upstream. The MTC packet provides a 8-bit slice of CTC which is related to TSC by the TMA packet, however the TMA packet only provides the lower 16 bits of CTC. If mtc_shift > 8 then some of the MTC bits are not in the CTC provided by the TMA packet. Fix-up the last_mtc calculated from the TMA packet by copying the missing bits from the current MTC assuming the least difference between the two, and that the current MTC comes after last_mtc. Signed-off-by:
Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Link: http://lkml.kernel.org/r/1475062896-22274-2-git-send-email-adrian.hunter@intel.comSigned-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by:
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Adrian Hunter authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit 51ee6481 upstream. In cycle-accurate mode, timestamps can be calculated from CYC packets. The decoder also estimates timestamps based on the number of instructions since the last timestamp. For that to work in cycle-accurate mode, the instruction count needs to be reset to zero when a timestamp is calculated from a CYC packet, but that wasn't happening, so fix it. Signed-off-by:
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Adrian Hunter authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit 810c398b upstream. Fix occasional decoder errors decoding trace data collected in snapshot mode. Snapshot mode can take successive snapshots of trace which might overlap. The decoder checks whether there is an overlap but only looks at the current and previous buffer. However buffers that do not contain synchronization (i.e. PSB) packets cannot be decoded or used for overlap checking. That means the decoder actually needs to check overlaps between the current buffer and the previous buffer that contained usable data. Make that change. Signed-off-by:
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Andrew Bresticker authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit d771fdf9 upstream. The ramoops buffer may be mapped as either I/O memory or uncached memory. On ARM64, this results in a device-type (strongly-ordered) mapping. Since unnaligned accesses to device-type memory will generate an alignment fault (regardless of whether or not strict alignment checking is enabled), it is not safe to use memcpy(). memcpy_fromio() is guaranteed to only use aligned accesses, so use that instead. Signed-off-by:
Andrew Bresticker <abrestic@chromium.org> Signed-off-by:
Enric Balletbo Serra <enric.balletbo@collabora.com> Reviewed-by:
Puneet Kumar <puneetster@chromium.org> Signed-off-by:
Kees Cook <keescook@chromium.org> Signed-off-by:
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Furquan Shaikh authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit 7e75678d upstream. persistent_ram_update uses vmap / iomap based on whether the buffer is in memory region or reserved region. However, both map it as non-cacheable memory. For armv8 specifically, non-cacheable mapping requests use a memory type that has to be accessed aligned to the request size. memcpy() doesn't guarantee that. Signed-off-by:
Furquan Shaikh <furquan@google.com> Signed-off-by:
Aaron Durbin <adurbin@chromium.org> Reviewed-by:
Olof Johansson <olofj@chromium.org> Tested-by:
Furquan Shaikh <furquan@chromium.org> Signed-off-by:
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Sebastian Andrzej Siewior authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit d5a9bf0b upstream. I have here a FPGA behind PCIe which exports SRAM which I use for pstore. Now it seems that the FPGA no longer supports cmpxchg based updates and writes back 0xff…ff and returns the same. This leads to crash during crash rendering pstore useless. Since I doubt that there is much benefit from using cmpxchg() here, I am dropping this atomic access and use the spinlock based version. Cc: Anton Vorontsov <anton@enomsg.org> Cc: Colin Cross <ccross@android.com> Cc: Kees Cook <keescook@chromium.org> Cc: Tony Luck <tony.luck@intel.com> Cc: Rabin Vincent <rabinv@axis.com> Tested-by:
Sebastian Andrzej Siewior <bigeasy@linutronix.de> Reviewed-by:
Guenter Roeck <linux@roeck-us.net> [kees: remove "_locked" suffix since it's the only option now] Signed-off-by:
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Sebastian Andrzej Siewior authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit 4407de74 upstream. A basic rmmod ramoops segfaults. Let's see why. Since commit 34f0ec82 ("pstore: Correct the max_dump_cnt clearing of ramoops") sets ->max_dump_cnt to zero before looping over ->przs but we didn't use it before that either. And since commit ee1d2674 ("pstore: add pstore unregister") we free that memory on rmmod. But even then, we looped until a NULL pointer or ERR. I don't see where it is ensured that the last member is NULL. Let's try this instead: simply error recovery and free. Clean up in error case where resources were allocated. And then, in the free path, rely on ->max_dump_cnt in the free path. Cc: Anton Vorontsov <anton@enomsg.org> Cc: Colin Cross <ccross@android.com> Cc: Kees Cook <keescook@chromium.org> Cc: Tony Luck <tony.luck@intel.com> Cc: Namhyung Kim <namhyung@kernel.org> Acked-by:
Namhyung Kim <namhyung@kernel.org> Signed-off-by:
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Helge Deller authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit 65bf34f5 upstream. Increase the initial kernel default page mapping size for 64-bit kernels to 64 MB and for 32-bit kernels to 32 MB. Due to the additional support of ftrace, tracepoint and huge pages the kernel size can exceed the sizes we used up to now. Signed-off-by:
Helge Deller <deller@gmx.de> Signed-off-by:
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Helge Deller authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit f8850abb upstream. Architecturally we need to keep __gp below 0x1000000. But because of ftrace and tracepoint support, the RO_DATA_SECTION now gets much bigger than it was before. By moving the linkage tables before RO_DATA_SECTION we can avoid that __gp gets positioned at a too high address. Signed-off-by:
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Helge Deller authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit 690d097c upstream. Increase the initial kernel default page mapping size for SMP kernels to 32MB and add a runtime check which panics early if the kernel is bigger than the initial mapping size. This fixes boot crashes of 32bit SMP kernels. Due to the introduction of huge page support in kernel 4.4 and it's required initial kernel layout in memory, a 32bit SMP kernel usually got bigger (in layout, not size) than 16MB. Signed-off-by:
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Srinivas Pandruvada authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit f9f4872d upstream. This is a requirement that MSR MSR_PM_ENABLE must be set to 0x01 before reading MSR_HWP_CAPABILITIES on a given CPU. If cpufreq init() is scheduled on a CPU which is not same as policy->cpu or migrates to a different CPU before calling msr read for MSR_HWP_CAPABILITIES, it is possible that MSR_PM_ENABLE was not to set to 0x01 on that CPU. This will cause GP fault. So like other places in this path rdmsrl_on_cpu should be used instead of rdmsrl. Moreover the scope of MSR_HWP_CAPABILITIES is on per thread basis, so it should be read from the same CPU, for which MSR MSR_HWP_REQUEST is getting set. dmesg dump or warning: [ 22.014488] WARNING: CPU: 139 PID: 1 at arch/x86/mm/extable.c:50 ex_handler_rdmsr_unsafe+0x68/0x70 [ 22.014492] unchecked MSR access error: RDMSR from 0x771 [ 22.014493] Modules linked in: [ 22.014507] CPU: 139 PID: 1 Comm: swapper/0 Not tainted 4.7.5+ #1 ... ... [ 22.014516] Call Trace: [ 22.014542] [<ffffffff813d7dd1>] dump_stack+0x63/0x82 [ 22.014558] [<ffffffff8107bc8b>] __warn+0xcb/0xf0 [ 22.014561] [<ffffffff8107bcff>] warn_slowpath_fmt+0x4f/0x60 [ 22.014563] [<ffffffff810676f8>] ex_handler_rdmsr_unsafe+0x68/0x70 [ 22.014564] [<ffffffff810677d9>] fixup_exception+0x39/0x50 [ 22.014604] [<ffffffff8102e400>] do_general_protection+0x80/0x150 [ 22.014610] [<ffffffff817f9ec8>] general_protection+0x28/0x30 [ 22.014635] [<ffffffff81687940>] ? get_target_pstate_use_performance+0xb0/0xb0 [ 22.014642] [<ffffffff810600c7>] ? native_read_msr+0x7/0x40 [ 22.014657] [<ffffffff81688123>] intel_pstate_hwp_set+0x23/0x130 [ 22.014660] [<ffffffff81688406>] intel_pstate_set_policy+0x1b6/0x340 [ 22.014662] [<ffffffff816829bb>] cpufreq_set_policy+0xeb/0x2c0 [ 22.014664] [<ffffffff81682f39>] cpufreq_init_policy+0x79/0xe0 [ 22.014666] [<ffffffff81682cb0>] ? cpufreq_update_policy+0x120/0x120 [ 22.014669] [<ffffffff816833a6>] cpufreq_online+0x406/0x820 [ 22.014671] [<ffffffff8168381f>] cpufreq_add_dev+0x5f/0x90 [ 22.014717] [<ffffffff81530ac8>] subsys_interface_register+0xb8/0x100 [ 22.014719] [<ffffffff816821bc>] cpufreq_register_driver+0x14c/0x210 [ 22.014749] [<ffffffff81fe1d90>] intel_pstate_init+0x39d/0x4d5 [ 22.014751] [<ffffffff81fe13f2>] ? cpufreq_gov_dbs_init+0x12/0x12 Signed-off-by:
Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by:
Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by:
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Sergei Shtylyov authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit e330b9a6 upstream. of_irq_get[_byname]() return 0 iff irq_create_of_mapping() call fails. Returning both error code and 0 on failure is a sign of a misdesigned API, it makes the failure check unnecessarily complex and error prone. We should rely on the platform IRQ resource in this case, not return 0, especially as 0 can be a valid IRQ resource too... Fixes: aff008ad ("platform_get_irq: Revert to platform_get_resource if of_irq_get fails") Signed-off-by:
Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Signed-off-by:
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Maik Broemme authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit 8e2e0317 upstream. Similar to the AR93xx and the AR94xx series, the AR95xx also have the same quirk for the Bus Reset. It will lead to instant system reset if the device is assigned via VFIO to a KVM VM. I've been able reproduce this behavior with a MikroTik R11e-2HnD. Fixes: c3e59ee4 ("PCI: Mark Atheros AR93xx to avoid bus reset") Signed-off-by:
Maik Broemme <mbroemme@libmpq.org> Signed-off-by:
Bjorn Helgaas <bhelgaas@google.com> Signed-off-by:
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Haibo Chen authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit 02265cd6 upstream. Potentially overflowing expression 1000000 * data->timeout_clks with type unsigned int is evaluated using 32-bit arithmetic, and then used in a context that expects an expression of type unsigned long long. To avoid overflow, cast 1000000U to type unsigned long long. Special thanks to Coverity. Fixes: 7f05538a ("mmc: sdhci: fix data timeout (part 2)") Signed-off-by:
Haibo Chen <haibo.chen@nxp.com> Acked-by:
Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by:
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Daniel Glöckner authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit 0ed50abb upstream. CMD23 aka SET_BLOCK_COUNT was introduced with MMC v3.1. Older versions of the specification allowed to terminate multi-block transfers only with CMD12. The patch fixes the following problem: mmc0: new MMC card at address 0001 mmcblk0: mmc0:0001 SDMB-16 15.3 MiB mmcblk0: timed out sending SET_BLOCK_COUNT command, card status 0x400900 ... blk_update_request: I/O error, dev mmcblk0, sector 0 Buffer I/O error on dev mmcblk0, logical block 0, async page read mmcblk0: unable to read partition table Signed-off-by:
Daniel Glöckner <dg@emlix.com> Signed-off-by:
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Larry Finger authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit 0c9d3491 upstream. Some RTL8821AE devices sold in Great Britain have the country code of 0x25 encoded in their EEPROM. This value is not tested in the routine that establishes the regulatory info for the chip. The fix is to set this code to have the same capabilities as the EU countries. In addition, the channels allowed for COUNTRY_CODE_ETSI were more properly suited for China and Israel, not the EU. This problem has also been fixed. Signed-off-by:
Larry Finger <Larry.Finger@lwfinger.net> Signed-off-by:
Kalle Valo <kvalo@codeaurora.org> Signed-off-by:
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Lin Huang authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit c8a9a6da upstream. there define two devfreq_event_get_drvdata() function in devfreq-event.h when disable CONFIG_PM_DEVFREQ_EVENT, it will lead to build fail. So remove devfreq_event_get_drvdata() function. Fixes: f262f28c ("PM / devfreq: event: Add devfreq_event class") Signed-off-by:
Lin Huang <hl@rock-chips.com> Signed-off-by:
Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by:
MyungJoo Ham <myungjoo.ham@samsung.com> Signed-off-by:
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Lucas Stach authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit d8846023 upstream. Initialize the GPU clock muxes to sane inputs. Until now they have not been changed from their default values, which means that both GPU3D shader and GPU2D core were fed by clock inputs whose rates exceed the maximium allowed frequency of the cores by as much as 200MHz. This fixes a severe GPU stability issue on i.MX6DL. Signed-off-by:
Lucas Stach <l.stach@pengutronix.de> Acked-by:
Shawn Guo <shawnguo@kernel.org> Signed-off-by:
Stephen Boyd <sboyd@codeaurora.org> Signed-off-by:
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Jan Remmet authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit 8f9165c9 upstream. http://www.ti.com/lit/pdf/SWCZ010: DCDC o/p voltage can go higher than programmed value Impact: VDDI, VDD2, and VIO output programmed voltage level can go higher than expected or crash, when coming out of PFM to PWM mode or using DVFS. Description: When DCDC CLK SYNC bits are 11/01: * VIO 3-MHz oscillator is the source clock of the digital core and input clock of VDD1 and VDD2 * Turn-on of VDD1 and VDD2 HSD PFETis synchronized or at a constant phase shift * Current pulled though VCC1+VCC2 is Iload(VDD1) + Iload(VDD2) * The 3 HSD PFET will be turned-on at the same time, causing the highest possible switching noise on the application. This noise level depends on the layout, the VBAT level, and the load current. The noise level increases with improper layout. When DCDC CLK SYNC bits are 00: * VIO 3-MHz oscillator is the source clock of digital core * VDD1 and VDD2 are running on their own 3-MHz oscillator * Current pulled though VCC1+VCC2 average of Iload(VDD1) + Iload(VDD2) * The switching noise of the 3 SMPS will be randomly spread over time, causing lower overall switching noise. Workaround: Set DCDCCTRL_REG[1:0]= 00. Signed-off-by:
Jan Remmet <j.remmet@phytec.de> Signed-off-by:
Mark Brown <broonie@kernel.org> Signed-off-by:
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Alexander Usyskin authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit ac182e8a upstream. Add device ids for Intel Kabypoint PCH (Kabylake) Signed-off-by:
Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by:
Tomas Winkler <tomas.winkler@intel.com> Signed-off-by:
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Liu Gang authored
BugLink: http://bugs.launchpad.net/bugs/1637510 commit d71cf15b upstream. From the beginning of the gpio-mpc8xxx.c, the "handle_level_irq" has being used to handle GPIO interrupts in the PowerPC/Layerscape platforms. But actually, almost all PowerPC/Layerscape platforms assert an interrupt request upon either a high-to-low change or any change on the state of the signal. So the "handle_level_irq" is not reasonable for PowerPC/Layerscape GPIO interrupt, it should be "handle_edge_irq". Otherwise the system may lost some interrupts from the PIN's state changes. Signed-off-by:
Liu Gang <Gang.Liu@nxp.com> Signed-off-by:
Linus Walleij <linus.walleij@linaro.org> Signed-off-by:
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Greg Kroah-Hartman authored
BugLink: http://bugs.launchpad.net/bugs/1637501Signed-off-by:
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Glauber Costa authored
BugLink: http://bugs.launchpad.net/bugs/1637501 commit 3932a86b upstream. While debugging timeouts happening in my application workload (ScyllaDB), I have observed calls to open() taking a long time, ranging everywhere from 2 seconds - the first ones that are enough to time out my application - to more than 30 seconds. The problem seems to happen because XFS may block on pending metadata updates under certain circumnstances, and that's confirmed with the following backtrace taken by the offcputime tool (iovisor/bcc): ffffffffb90c57b1 finish_task_switch ffffffffb97dffb5 schedule ffffffffb97e310c schedule_timeout ffffffffb97e1f12 __down ffffffffb90ea821 down ffffffffc046a9dc xfs_buf_lock ffffffffc046abfb _xfs_buf_find ffffffffc046ae4a xfs_buf_get_map ffffffffc046babd xfs_buf_read_map ffffffffc0499931 xfs_trans_read_buf_map ffffffffc044a561 xfs_da_read_buf ffffffffc0451390 xfs_dir3_leaf_read.constprop.16 ffffffffc0452b90 xfs_dir2_leaf_lookup_int ffffffffc0452e0f xfs_dir2_leaf_lookup ffffffffc044d9d3 xfs_dir_lookup ffffffffc047d1d9 xfs_lookup ffffffffc0479e53 xfs_vn_lookup ffffffffb925347a path_openat ffffffffb9254a71 do_filp_open ffffffffb9242a94 do_sys_open ffffffffb9242b9e sys_open ffffffffb97e42b2 entry_SYSCALL_64_fastpath 00007fb0698162ed [unknown] Inspecting my run with blktrace, I can see that the xfsaild kthread exhibit very high "Dispatch wait" times, on the dozens of seconds range and consistent with the open() times I have saw in that run. Still from the blktrace output, we can after searching a bit, identify the request that wasn't dispatched: 8,0 11 152 81.092472813 804 A WM 141698288 + 8 <- (8,1) 141696240 8,0 11 153 81.092472889 804 Q WM 141698288 + 8 [xfsaild/sda1] 8,0 11 154 81.092473207 804 G WM 141698288 + 8 [xfsaild/sda1] 8,0 11 206 81.092496118 804 I WM 141698288 + 8 ( 22911) [xfsaild/sda1] <==== 'I' means Inserted (into the IO scheduler) ===================================> 8,0 0 289372 96.718761435 0 D WM 141698288 + 8 (15626265317) [swapper/0] <==== Only 15s later the CFQ scheduler dispatches the request ======================> As we can see above, in this particular example CFQ took 15 seconds to dispatch this request. Going back to the full trace, we can see that the xfsaild queue had plenty of opportunity to run, and it was selected as the active queue many times. It would just always be preempted by something else (example): 8,0 1 0 81.117912979 0 m N cfq1618SN / insert_request 8,0 1 0 81.117913419 0 m N cfq1618SN / add_to_rr 8,0 1 0 81.117914044 0 m N cfq1618SN / preempt 8,0 1 0 81.117914398 0 m N cfq767A / slice expired t=1 8,0 1 0 81.117914755 0 m N cfq767A / resid=40 8,0 1 0 81.117915340 0 m N / served: vt=1948520448 min_vt=1948520448 8,0 1 0 81.117915858 0 m N cfq767A / sl_used=1 disp=0 charge=0 iops=1 sect=0 where cfq767 is the xfsaild queue and cfq1618 corresponds to one of the ScyllaDB IO dispatchers. The requests preempting the xfsaild queue are synchronous requests. That's a characteristic of ScyllaDB workloads, as we only ever issue O_DIRECT requests. While it can be argued that preempting ASYNC requests in favor of SYNC is part of the CFQ logic, I don't believe that doing so for 15+ seconds is anyone's goal. Moreover, unless I am misunderstanding something, that breaks the expectation set by the "fifo_expire_async" tunable, which in my system is set to the default. Looking at the code, it seems to me that the issue is that after we make an async queue active, there is no guarantee that it will execute any request. When the queue itself tests if it cfq_may_dispatch() it can bail if it sees SYNC requests in flight. An incoming request from another queue can also preempt it in such situation before we have the chance to execute anything (as seen in the trace above). This patch sets the must_dispatch flag if we notice that we have requests that are already fifo_expired. This flag is always cleared after cfq_dispatch_request() returns from cfq_dispatch_requests(), so it won't pin the queue for subsequent requests (unless they are themselves expired) Care is taken during preempt to still allow rt requests to preempt us regardless. Testing my workload with this patch applied produces much better results. From the application side I see no timeouts, and the open() latency histogram generated by systemtap looks much better, with the worst outlier at 131ms: Latency histogram of xfs_buf_lock acquisition (microseconds): value |-------------------------------------------------- count 0 | 11 1 |@@@@ 161 2 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 1966 4 |@ 54 8 | 36 16 | 7 32 | 0 64 | 0 ~ 1024 | 0 2048 | 0 4096 | 1 8192 | 1 16384 | 2 32768 | 0 65536 | 0 131072 | 1 262144 | 0 524288 | 0 Signed-off-by:
Glauber Costa <glauber@scylladb.com> CC: Jens Axboe <axboe@kernel.dk> CC: linux-block@vger.kernel.org CC: linux-kernel@vger.kernel.org Signed-off-by:
Jens Axboe <axboe@fb.com> Signed-off-by:
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Miklos Szeredi authored
BugLink: http://bugs.launchpad.net/bugs/1637501 commit f2b20f6e upstream. This fixes a bug where the permission was not properly checked in overlayfs. The testcase is ltp/utimensat01. It is also cleaner and safer to do the permission checking in the vfs helper instead of the caller. This patch introduces an additional ia_valid flag ATTR_TOUCH (since touch(1) is the most obvious user of utimes(NULL)) that is passed into notify_change whenever the conditions for this special permission checking mode are met. Reported-by:
Aihua Zhang <zhangaihua1@huawei.com> Signed-off-by:
Miklos Szeredi <mszeredi@redhat.com> Tested-by:
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Marcelo Ricardo Leitner authored
BugLink: http://bugs.launchpad.net/bugs/1637501 commit 3a8db798 upstream. After backporting commit ee44b4bc ("dlm: use sctp 1-to-1 API") series to a kernel with an older workqueue which didn't use RCU yet, it was noticed that we are freeing the workqueues in dlm_lowcomms_stop() too early as free_conn() will try to access that memory for canceling the queued works if any. This issue was introduced by commit 0d737a8c as before it such attempt to cancel the queued works wasn't performed, so the issue was not present. This patch fixes it by simply inverting the free order. Fixes: 0d737a8c ("dlm: fix race while closing connections") Signed-off-by:
Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by:
David Teigland <teigland@redhat.com> Signed-off-by:
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gmail authored
BugLink: http://bugs.launchpad.net/bugs/1637501 commit e81d4477 upstream. The commit 6050d47a: "ext4: bail out from make_indexed_dir() on first error" could end up leaking bh2 in the error path. [ Also avoid renaming bh2 to bh, which just confuses things --tytso ] Signed-off-by:
yangsheng <yngsion@gmail.com> Signed-off-by:
Theodore Ts'o <tytso@mit.edu> Signed-off-by:
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Ross Zwisler authored
BugLink: http://bugs.launchpad.net/bugs/1637501 commit cca32b7e upstream. Currently when doing a DAX hole punch with ext4 we fail to do a writeback. This is because the logic around filemap_write_and_wait_range() in ext4_punch_hole() only looks for dirty page cache pages in the radix tree, not for dirty DAX exceptional entries. Signed-off-by:
Ross Zwisler <ross.zwisler@linux.intel.com> Reviewed-by:
Jan Kara <jack@suse.cz> Signed-off-by:
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Fabian Frederick authored
BugLink: http://bugs.launchpad.net/bugs/1637501 commit edf15aa1 upstream. Running xfstests generic/013 with kmemleak gives the following: unreferenced object 0xffff8801d3d27de0 (size 96): comm "fsstress", pid 4941, jiffies 4294860168 (age 53.485s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 01 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<ffffffff818eaaf3>] kmemleak_alloc+0x23/0x40 [<ffffffff81179805>] __kmalloc+0xf5/0x1d0 [<ffffffff8122ef5c>] ext4_find_extent+0x1ec/0x2f0 [<ffffffff8123530c>] ext4_insert_range+0x34c/0x4a0 [<ffffffff81235942>] ext4_fallocate+0x4e2/0x8b0 [<ffffffff81181334>] vfs_fallocate+0x134/0x210 [<ffffffff8118203f>] SyS_fallocate+0x3f/0x60 [<ffffffff818efa9b>] entry_SYSCALL_64_fastpath+0x13/0x8f [<ffffffffffffffff>] 0xffffffffffffffff Problem seems mitigated by dropping refs and freeing path when there's no path[depth].p_ext Signed-off-by:
Fabian Frederick <fabf@skynet.be> Signed-off-by:
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Daeho Jeong authored
BugLink: http://bugs.launchpad.net/bugs/1637501 commit 93e3b4e6 upstream. Now, ext4_do_update_inode() clears high 16-bit fields of uid/gid of deleted and evicted inode to fix up interoperability with old kernels. However, it checks only i_dtime of an inode to determine whether the inode was deleted and evicted, and this is very risky, because i_dtime can be used for the pointer maintaining orphan inode list, too. We need to further check whether the i_dtime is being used for the orphan inode list even if the i_dtime is not NULL. We found that high 16-bit fields of uid/gid of inode are unintentionally and permanently cleared when the inode truncation is just triggered, but not finished, and the inode metadata, whose high uid/gid bits are cleared, is written on disk, and the sudden power-off follows that in order. Signed-off-by:
Daeho Jeong <daeho.jeong@samsung.com> Signed-off-by:
Hobin Woo <hobin.woo@samsung.com> Signed-off-by:
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Eric Whitney authored
BugLink: http://bugs.launchpad.net/bugs/1637501 commit 14fbd4aa upstream. Online defragging of encrypted files is not currently implemented. However, the move extent ioctl can still return successfully when called. For example, this occurs when xfstest ext4/020 is run on an encrypted file system, resulting in a corrupted test file and a corresponding test failure. Until the proper functionality is implemented, fail the move extent ioctl if either the original or donor file is encrypted. Signed-off-by:
Eric Whitney <enwlinux@gmail.com> Signed-off-by:
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Borislav Petkov authored
BugLink: http://bugs.launchpad.net/bugs/1637501 commit 4bd173c3 upstream. Do the user_len check first and then the ver_addr allocation so that we can save us the kfree() on the error path when user_len is > ARCMSR_API_DATA_BUFLEN. Signed-off-by:
Borislav Petkov <bp@suse.de> Cc: Marco Grassi <marco.gra@gmail.com> Cc: Dan Carpenter <dan.carpenter@oracle.com> Cc: Tomas Henzl <thenzl@redhat.com> Cc: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by:
Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by:
Tomas Henzl <thenzl@redhat.com> Signed-off-by:
Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by:
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