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[Bug 1046989] null pointer dereference in 4.11.7-1 - block device cleanup on umount
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Mon, 03 Jul 2017 13:04:54 +0000
  • Message-id: <bug-1046989-21960-1GWH8GW0XT@http.bugzilla.suse.com/>
http://bugzilla.suse.com/show_bug.cgi?id=1046989
http://bugzilla.suse.com/show_bug.cgi?id=1046989#c2

Michal Kubeček <mkubecek@xxxxxxxx> changed:

What |Removed |Added
----------------------------------------------------------------------------
CC| |mkubecek@xxxxxxxx

--- Comment #2 from Michal Kubeček <mkubecek@xxxxxxxx> ---
Adding myself to Cc after all, I might have just hit something similar:

[348136.259438] CPU: 1 PID: 22516 Comm: kworker/1:2 Tainted: G O
4.12.0-rc7-99.1-default #1
[348136.259516] Hardware name: MSI MS-7640/990FXA-GD65 (MS-7640), BIOS V19.9
10/08/2012
[348136.259584] Workqueue: events __blk_release_queue
[348136.259626] task: ffff88a152ad2000 task.stack: ffffa37607c60000
[348136.259678] RIP: 0010:kmem_cache_free+0x14/0x150
[348136.259719] RSP: 0018:ffffa37607c63e08 EFLAGS: 00010202
[348136.259765] RAX: ffffffffb5581c80 RBX: ffff88a59d702600 RCX:
fffff8655fec869f
[348136.259826] RDX: 0000000000000003 RSI: ffff88a59d702600 RDI:
0000000000000000
[348136.259888] RBP: 0000000000000000 R08: 00013ca0ca02ec00 R09:
00000000000000bf
[348136.259950] R10: ffffa37607c63d10 R11: 0000000000000001 R12:
ffff88a5bec5fe00
[348136.260011] R13: 0000000000000000 R14: ffff88a416e12f00 R15:
ffff88a59b4fd870
[348136.260073] FS: 0000000000000000(0000) GS:ffff88a5bec40000(0000)
knlGS:0000000000000000
[348136.260142] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[348136.260191] CR2: 0000000000000021 CR3: 000000081d80e000 CR4:
00000000000406e0
[348136.260252] Call Trace:
[348136.260282] free_request_size+0x1d/0x30
[348136.260319] mempool_destroy+0x31/0x70
[348136.260354] blk_exit_rl+0x1e/0x40
[348136.260386] __blk_release_queue+0x7c/0x130
[348136.260425] process_one_work+0x17c/0x3b0
[348136.260462] worker_thread+0x4a/0x390
[348136.260497] ? process_one_work+0x3b0/0x3b0
[348136.260536] kthread+0x118/0x130
[348136.260567] ? kthread_create_on_node+0x40/0x40
[348136.260610] ret_from_fork+0x25/0x30
[348136.260643] Code: 05 72 2e c0 00 e9 a5 fd ff ff 0f 1f 00 66 2e 0f 1f 84 00
00 00 00 00 0f 1f 44 00 00 41 54 55 48 89 fd 53 48 89 f3 0f 1f 44 00 00 <f6> 47
21 01 75 3f 48 85 ed 74 35 9c 58 0f 1f 44 00 00 49 89 c4
[348136.260829] RIP: kmem_cache_free+0x14/0x150 RSP: ffffa37607c63e08
[348136.260882] CR2: 0000000000000021

This is a self-built kernel (with DEBUG_VM enabled and e44699d2c280
cherry-picked)
so I'll have to find debuginfo for it first.

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