[BUG]rmmod null_blk lead to general protection fault on 3.19.0-rc6

[Jinpu Wang]

When rmmod null_blk lead to GPF below:

[   29.193712] IPv6: ADDRCONF(NETDEV_CHANGE): ib0: link becomes ready
[   62.216289] general protection fault: 0000 [#1] SMP DEBUG_PAGEALLOC
[   62.216586] Dumping ftrace buffer:
[   62.216660]    (ftrace buffer empty)
[   62.216730] Modules linked in: ib_ipoib ib_uverbs ib_umad mlx4_ib
mlx4_en rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core ib_addr null_blk(-)
mlx4_core
[   62.217755] CPU: 1 PID: 3928 Comm: rmmod Not tainted 3.19.0-rc6debug #1
[   62.217824] Hardware name: To be filled by O.E.M. To be filled by
O.E.M./M5A97 R2.0, BIOS 2501 04/07/2014
[   62.217900] task: ffff880233450000 ti: ffff8802289a8000 task.ti:
ffff8802289a8000
[   62.217966] RIP: 0010:[<ffffffff8138c293>]  [<ffffffff8138c293>]
blk_mq_tag_wakeup_all+0x13/0x90
[   62.218095] RSP: 0018:ffff8802289abe68  EFLAGS: 00010202
[   62.218170] RAX: ffff8800b534d480 RBX: 0000000000000000 RCX: 0000000000000001
[   62.218247] RDX: 000000006b6b6b6b RSI: 0000000000000001 RDI: 6b6b6b6b6b6b6b6b
[   62.218316] RBP: ffff8802289abe88 R08: 0000000000000038 R09: 0000000000000000
[   62.218969] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
[   62.219038] R13: ffff880232b20a20 R14: 00007f7cad118090 R15: 0000000000000800
[   62.219107] FS:  00007f7cac1ac700(0000) GS:ffff880235200000(0000)
knlGS:0000000000000000
[   62.219175] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   62.219288] CR2: 00007f11a69e4095 CR3: 0000000230d54000 CR4: 00000000000407e0
[   62.219401] Stack:
[   62.219514]  0000000000000000 ffff880232b20000 ffff880232b20a20
00007f7cad118090
[   62.219912]  ffff8802289abea8 ffffffff8138985e ffff880232b20000
ffff880232b20000
[   62.220333]  ffff8802289abec8 ffffffff8137cfd6 ffff880232b20000
ffff880232b20730
[   62.220724] Call Trace:
[   62.220834]  [<ffffffff8138985e>] blk_mq_wake_waiters+0x4e/0x80
[   62.220952]  [<ffffffff8137cfd6>] blk_set_queue_dying+0x26/0x90
[   62.221068]  [<ffffffff8137d075>] blk_cleanup_queue+0x35/0x2a0
[   62.221187]  [<ffffffffa004b7f4>] null_exit+0x57/0x8c [null_blk]
[   62.221308]  [<ffffffff81112a98>] SyS_delete_module+0x1b8/0x220
[   62.221456]  [<ffffffff817db3d2>] system_call_fastpath+0x12/0x17
[   62.221580] Code: 40 08 b8 01 00 00 00 5d c3 66 66 66 66 66 66 2e
0f 1f 84 00 00 00 00 00 66 66 66 66 90 55 48 89 e5 41 56 41 55 41 54
53 41 89 f4 <44> 8b 6f 28 48 89 fb 41 be 08 00 00 00 49 63 c5 48 c1 e0
07 48
[   62.227747] RIP  [<ffffffff8138c293>] blk_mq_tag_wakeup_all+0x13/0x90
[   62.227917]  RSP <ffff8802289abe68>
[   62.228138] ---[ end trace 349782d190908f70 ]---


-- 
Best Regards,

Jack Wang
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