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    • Mikulas Patocka's avatar
      crash in md-raid1 and md-raid10 due to incorrect list manipulation · a452744b
      Mikulas Patocka authored
      The commit 55ce74d4 (md/raid1: ensure
      device failure recorded before write request returns) is causing crash in
      the LVM2 testsuite test shell/lvchange-raid.sh. For me the crash is 100%
      reproducible.
      
      The reason for the crash is that the newly added code in raid1d moves the
      list from conf->bio_end_io_list to tmp, then tests if tmp is non-empty and
      then incorrectly pops the bio from conf->bio_end_io_list (which is empty
      because the list was alrady moved).
      
      Raid-10 has a similar bug.
      
      Kernel Fault: Code=15 regs=000000006ccb8640 (Addr=0000000100000000)
      CPU: 3 PID: 1930 Comm: mdX_raid1 Not tainted 4.2.0-rc5-bisect+ #35
      task: 000000006cc1f258 ti: 000000006ccb8000 task.ti: 000000006ccb8000
      
           YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI
      PSW: 00001000000001001111111000001111 Not tainted
      r00-03  000000ff0804fe0f 000000001059d000 000000001059f818 000000007f16be38
      r04-07  000000001059d000 000000007f16be08 0000000000200200 0000000000000001
      r08-11  000000006ccb8260 000000007b7934d0 0000000000000001 0000000000000000
      r12-15  000000004056f320 0000000000000000 0000000000013dd0 0000000000000000
      r16-19  00000000f0d00ae0 0000000000000000 0000000000000000 0000000000000001
      r20-23  000000000800000f 0000000042200390 0000000000000000 0000000000000000
      r24-27  0000000000000001 000000000800000f 000000007f16be08 000000001059d000
      r28-31  0000000100000000 000000006ccb8560 000000006ccb8640 0000000000000000
      sr00-03  0000000000249800 0000000000000000 0000000000000000 0000000000249800
      sr04-07  0000000000000000 0000000000000000 0000000000000000 0000000000000000
      
      IASQ: 0000000000000000 0000000000000000 IAOQ: 000000001059f61c 000000001059f620
       IIR: 0f8010c6    ISR: 0000000000000000  IOR: 0000000100000000
       CPU:        3   CR30: 000000006ccb8000 CR31: 0000000000000000
       ORIG_R28: 000000001059d000
       IAOQ[0]: call_bio_endio+0x34/0x1a8 [raid1]
       IAOQ[1]: call_bio_endio+0x38/0x1a8 [raid1]
       RP(r2): raid_end_bio_io+0x88/0x168 [raid1]
      Backtrace:
       [<000000001059f818>] raid_end_bio_io+0x88/0x168 [raid1]
       [<00000000105a4f64>] raid1d+0x144/0x1640 [raid1]
       [<000000004017fd5c>] kthread+0x144/0x160
      Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
      Fixes: 55ce74d4 ("md/raid1: ensure device failure recorded before write request returns.")
      Fixes: 95af587e ("md/raid10: ensure device failure recorded before write request returns.")
      Signed-off-by: default avatarNeilBrown <neilb@suse.com>
      a452744b