[dm-devel] BUG: unable to handle kernel paging request

[Casey Chen]

Hi,

It is unclear to me whether the issue has been solved or not from previous discussions.
We found a similar crash on v4.4.262. The crash happened at the exact line of code as
described by Igor. I wonder what's the fix and possible ways to test the fix. Thanks!

[14501930.727650,06] BUG: unable to handle kernel paging request at ffffc901aed4d048
[14501930.730983,06] IP: [<ffffffff816612cf>] dm_softirq_done+0x8f/0x270
[14501930.732776,06] PGD 18fcbb067 PUD 2e3b7b067 PMD 2cab08067 PTE 0
[14501930.734640,06] Oops: 0000 [#1] SMP
[14501930.736507,06] Dumping ftrace buffer:
...
[14501930.818509,06] CPU: 6 PID: 14767 Comm: <masked off> Tainted: P        W  O    4.4.262+
...
[14501930.938477,06] Call Trace:
[14501930.941301,06]  <IRQ>
[14501930.941351,06]  [<ffffffff8130b6c3>] __blk_mq_complete_request+0x83/0xf0
[14501930.946847,06]  [<ffffffff8130b74c>] blk_mq_complete_request+0x1c/0x20
[14501930.949574,06]  [<ffffffff81660494>] dm_complete_request+0x34/0x50
[14501930.952256,06]  [<ffffffff816604df>] end_clone_request+0x2f/0x50
[14501930.954883,06]  [<ffffffff8130a7cd>] blk_mq_end_request+0x3d/0x70
[14501930.957460,06]  [<ffffffffa028484c>] nvme_rdma_complete_rq+0x4c/0x210 [nvme_rdma]
[14501930.962447,06]  [<ffffffff810760ac>] ? __local_bh_enable+0x3c/0x70
[14501930.964972,06]  [<ffffffff813097f0>] ? blkdev_issue_zeroout+0x260/0x260
[14501930.967459,06]  [<ffffffff81309809>] __blk_mq_complete_request_remote+0x19/0x20
[14501930.972291,06]  [<ffffffff810ef099>] flush_smp_call_function_queue+0xa9/0x170
[14501930.977138,06]  [<ffffffff810efaa3>] generic_smp_call_function_single_interrupt+0x13/0x60
[14501930.982005,06]  [<ffffffff810495bd>] smp_call_function_interrupt+0x2d/0x40
[14501930.984492,06]  [<ffffffff810496be>] smp_call_function_single_interrupt+0xe/0x10
[14501930.989316,06]  [<ffffffff817d0221>] call_function_single_interrupt+0x91/0xa0
[14501930.994301,06]  <EOI>
[14501930.994350,06]  [<ffffffff810031a0>] ? exit_to_usermode_loop+0x50/0xb0
[14501930.999364,06]  [<ffffffff81003199>] ? exit_to_usermode_loop+0x49/0xb0
[14501931.001829,06]  [<ffffffff81003b62>] prepare_exit_to_usermode+0x32/0x40
[14501931.004261,06]  [<ffffffff817cf979>] retint_user+0x8/0x20
[14501931.006626,06] Code: 16 41 83 fc 02 0f 85 df 01 00 00 49 8b 76 10 49 8b 3e e8 05 fe ff ff 5b 41 5c 41 5d 41 5e 41 5f 5d c3 49 8b 7e 08 48 85 ff 74 bd <48> 8b 47 08 48 8b 40 60 48 85 c0 74 b0 44 89 e2 49 8d 4e 48 4c
[14501931.014038,06] RIP  [<ffffffff816612cf>] dm_softirq_done+0x8f/0x270
[14501931.016532,06]  RSP <ffff8817e0ac3e28>
[14501931.018971,06] CR2: ffffc901aed4d048
[14501931.021382,06] ---[ end trace 67b8f26e34c76805 ]---

Regards,
Casey