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Xiaoguang Wang authored
When running liburing test case 'accept', I got below warning: RED: Invalid credentials RED: At include/linux/cred.h:285 RED: Specified credentials: 00000000d02474a0 RED: ->magic=4b, put_addr=000000005b4f46e9 RED: ->usage=-1699227648, subscr=-25693 RED: ->*uid = { 256,-25693,-25693,65534 } RED: ->*gid = { 0,-1925859360,-1789740800,-1827028688 } RED: ->security is 00000000258c136e eneral protection fault, probably for non-canonical address 0xdead4ead00000000: 0000 [#1] SMP PTI PU: 21 PID: 2037 Comm: accept Not tainted 5.6.0+ #318 ardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.11.1-0-g0551a4be2c-prebuilt.qemu-project.org 04/01/2014 IP: 0010:dump_invalid_creds+0x16f/0x184 ode: 48 8b 83 88 00 00 00 48 3d ff 0f 00 00 76 29 48 89 c2 81 e2 00 ff ff ff 48 81 fa 00 6b 6b 6b 74 17 5b 48 c7 c7 4b b1 10 8e 5d <8b> 50 04 41 5c 8b 30 41 5d e9 67 e3 04 00 5b 5d 41 5c 41 5d c3 0f SP: 0018:ffffacc1039dfb38 EFLAGS: 00010087 AX: dead4ead00000000 RBX: ffff9ba39319c100 RCX: 0000000000000007 DX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e10b14b BP: ffffffff8e108476 R08: 0000000000000000 R09: 0000000000000001 10: 0000000000000000 R11: ffffacc1039df9e5 R12: 000000009552b900 13: 000000009319c130 R14: ffff9ba39319c100 R15: 0000000000000246 S: 00007f96b2bfc4c0(0000) GS:ffff9ba39f340000(0000) knlGS:0000000000000000 S: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 R2: 0000000000401870 CR3: 00000007db7a4000 CR4: 00000000000006e0 all Trace: __invalid_creds+0x48/0x4a __io_req_aux_free+0x2e8/0x3b0 ? io_poll_remove_one+0x2a/0x1d0 __io_free_req+0x18/0x200 io_free_req+0x31/0x350 io_poll_remove_one+0x17f/0x1d0 io_poll_cancel.isra.80+0x6c/0x80 io_async_find_and_cancel+0x111/0x120 io_issue_sqe+0x181/0x10e0 ? __lock_acquire+0x552/0xae0 ? lock_acquire+0x8e/0x310 ? fs_reclaim_acquire.part.97+0x5/0x30 __io_queue_sqe.part.100+0xc4/0x580 ? io_submit_sqes+0x751/0xbd0 ? rcu_read_lock_sched_held+0x32/0x40 io_submit_sqes+0x9ba/0xbd0 ? __x64_sys_io_uring_enter+0x2b2/0x460 ? __x64_sys_io_uring_enter+0xaf/0x460 ? find_held_lock+0x2d/0x90 ? __x64_sys_io_uring_enter+0x111/0x460 __x64_sys_io_uring_enter+0x2d7/0x460 do_syscall_64+0x5a/0x230 entry_SYSCALL_64_after_hwframe+0x49/0xb3 After looking into codes, it turns out that this issue is because we didn't restore the req->work, which is changed in io_arm_poll_handler(), req->work is a union with below struct: struct { struct callback_head task_work; struct hlist_node hash_node; struct async_poll *apoll; }; If we forget to restore, members in struct io_wq_work would be invalid, restore the req->work to fix this issue. Signed-off-by:
Xiaoguang Wang <xiaoguang.wang@linux.alibaba.com> Get rid of not needed 'need_restore' variable. Signed-off-by:
Jens Axboe <axboe@kernel.dk>
b1f573bd