• David Jeffery's avatar
    libata: prevent HSM state change race between ISR and PIO · a06e5037
    David Jeffery authored
    commit ce751452 upstream.
    
    It is possible for ata_sff_flush_pio_task() to set ap->hsm_task_state to
    HSM_ST_IDLE in between the time __ata_sff_port_intr() checks for HSM_ST_IDLE
    and before it calls ata_sff_hsm_move() causing ata_sff_hsm_move() to BUG().
    
    This problem is hard to reproduce making this patch hard to verify, but this
    fix will prevent the race.
    
    I have not been able to reproduce the problem, but here is a crash dump from
    a 2.6.32 kernel.
    
    On examining the ata port's state, its hsm_task_state field has a value of HSM_ST_IDLE:
    
    crash> struct ata_port.hsm_task_state ffff881c1121c000
      hsm_task_state = 0
    
    Normally, this should not be possible as ata_sff_hsm_move() was called from ata_sff_host_intr(),
    which checks hsm_task_state and won't call ata_sff_hsm_move() if it has a HSM_ST_IDLE value.
    
    PID: 11053  TASK: ffff8816e846cae0  CPU: 0   COMMAND: "sshd"
     #0 [ffff88008ba03960] machine_kexec at ffffffff81038f3b
     #1 [ffff88008ba039c0] crash_kexec at ffffffff810c5d92
     #2 [ffff88008ba03a90] oops_end at ffffffff8152b510
     #3 [ffff88008ba03ac0] die at ffffffff81010e0b
     #4 [ffff88008ba03af0] do_trap at ffffffff8152ad74
     #5 [ffff88008ba03b50] do_invalid_op at ffffffff8100cf95
     #6 [ffff88008ba03bf0] invalid_op at ffffffff8100bf9b
        [exception RIP: ata_sff_hsm_move+317]
        RIP: ffffffff813a77ad  RSP: ffff88008ba03ca0  RFLAGS: 00010097
        RAX: 0000000000000000  RBX: ffff881c1121dc60  RCX: 0000000000000000
        RDX: ffff881c1121dd10  RSI: ffff881c1121dc60  RDI: ffff881c1121c000
        RBP: ffff88008ba03d00   R8: 0000000000000000   R9: 000000000000002e
        R10: 000000000001003f  R11: 000000000000009b  R12: ffff881c1121c000
        R13: 0000000000000000  R14: 0000000000000050  R15: ffff881c1121dd78
        ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
     #7 [ffff88008ba03d08] ata_sff_host_intr at ffffffff813a7fbd
     #8 [ffff88008ba03d38] ata_sff_interrupt at ffffffff813a821e
     #9 [ffff88008ba03d78] handle_IRQ_event at ffffffff810e6ec0
    >--- <IRQ stack> ---
        [exception RIP: pipe_poll+48]
        RIP: ffffffff81192780  RSP: ffff880f26d459b8  RFLAGS: 00000246
        RAX: 0000000000000000  RBX: ffff880f26d459c8  RCX: 0000000000000000
        RDX: 0000000000000001  RSI: 0000000000000000  RDI: ffff881a0539fa80
        RBP: ffffffff8100bb8e   R8: ffff8803b23324a0   R9: 0000000000000000
        R10: ffff880f26d45dd0  R11: 0000000000000008  R12: ffffffff8109b646
        R13: ffff880f26d45948  R14: 0000000000000246  R15: 0000000000000246
        ORIG_RAX: ffffffffffffff10  CS: 0010  SS: 0018
        RIP: 00007f26017435c3  RSP: 00007fffe020c420  RFLAGS: 00000206
        RAX: 0000000000000017  RBX: ffffffff8100b072  RCX: 00007fffe020c45c
        RDX: 00007f2604a3f120  RSI: 00007f2604a3f140  RDI: 000000000000000d
        RBP: 0000000000000000   R8: 00007fffe020e570   R9: 0101010101010101
        R10: 0000000000000000  R11: 0000000000000246  R12: 00007fffe020e5f0
        R13: 00007fffe020e5f4  R14: 00007f26045f373c  R15: 00007fffe020e5e0
        ORIG_RAX: 0000000000000017  CS: 0033  SS: 002b
    
    Somewhere between the ata_sff_hsm_move() check and the ata_sff_host_intr() check, the value changed.
    On examining the other cpus to see what else was running, another cpu was running the error handler
    routines:
    
    PID: 326    TASK: ffff881c11014aa0  CPU: 1   COMMAND: "scsi_eh_1"
     #0 [ffff88008ba27e90] crash_nmi_callback at ffffffff8102fee6
     #1 [ffff88008ba27ea0] notifier_call_chain at ffffffff8152d515
     #2 [ffff88008ba27ee0] atomic_notifier_call_chain at ffffffff8152d57a
     #3 [ffff88008ba27ef0] notify_die at ffffffff810a154e
     #4 [ffff88008ba27f20] do_nmi at ffffffff8152b1db
     #5 [ffff88008ba27f50] nmi at ffffffff8152aaa0
        [exception RIP: _spin_lock_irqsave+47]
        RIP: ffffffff8152a1ff  RSP: ffff881c11a73aa0  RFLAGS: 00000006
        RAX: 0000000000000001  RBX: ffff881c1121deb8  RCX: 0000000000000000
        RDX: 0000000000000246  RSI: 0000000000000020  RDI: ffff881c122612d8
        RBP: ffff881c11a73aa0   R8: ffff881c17083800   R9: 0000000000000000
        R10: 0000000000000000  R11: 0000000000000000  R12: ffff881c1121c000
        R13: 000000000000001f  R14: ffff881c1121dd50  R15: ffff881c1121dc60
        ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0000
    >--- <NMI exception stack> ---
     #6 [ffff881c11a73aa0] _spin_lock_irqsave at ffffffff8152a1ff
     #7 [ffff881c11a73aa8] ata_exec_internal_sg at ffffffff81396fb5
     #8 [ffff881c11a73b58] ata_exec_internal at ffffffff81397109
     #9 [ffff881c11a73bd8] atapi_eh_request_sense at ffffffff813a34eb
    
    Before it tried to acquire a spinlock, ata_exec_internal_sg() called ata_sff_flush_pio_task().
    This function will set ap->hsm_task_state to HSM_ST_IDLE, and has no locking around setting this
    value. ata_sff_flush_pio_task() can then race with the interrupt handler and potentially set
    HSM_ST_IDLE at a fatal moment, which will trigger a kernel BUG.
    
    v2: Fixup comment in ata_sff_flush_pio_task()
    
    tj: Further updated comment.  Use ap->lock instead of shost lock and
        use the [un]lock_irq variant instead of the irqsave/restore one.
    Signed-off-by: default avatarDavid Milburn <dmilburn@redhat.com>
    Signed-off-by: default avatarTejun Heo <tj@kernel.org>
    Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
    a06e5037
libata-sff.c 84.2 KB