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Subject: Re: btrfs btree_ctree_super fault
To: Chris Cui <chris.wei.cui@gmail.com>, <linux-btrfs@vger.kernel.org>
References: <CANx2UGGLP_jSNZ038H2Wd0bTwqSu=1VQKDaZ=sKr8ARg_Fgv4A@mail.gmail.com>
From: Chris Mason <clm@fb.com>
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Date: Thu, 17 Nov 2016 10:34:29 -0500
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On 11/17/2016 12:39 AM, Chris Cui wrote:
> We have just encountered the same bug on 4.9.0-rc2.  Any solution now?
>
>> kernel BUG at fs/btrfs/ctree.c:3172!
>> invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
>> CPU: 0 PID: 22702 Comm: trinity-c40 Not tainted 4.9.0-rc4-think+ #1
>> task: ffff8804ffde37c0 task.stack: ffffc90002188000
>> RIP: 0010:[<ffffffffa00576b9>]
>>   [<ffffffffa00576b9>] btrfs_set_item_key_safe+0x179/0x190 [btrfs]
>> RSP: 0000:ffffc9000218b8a8  EFLAGS: 00010246
>> RAX: 0000000000000000 RBX: ffff8804fddcf348 RCX: 0000000000001000
>> RDX: 0000000000000000 RSI: ffffc9000218b9ce RDI: ffffc9000218b8c7
>> RBP: ffffc9000218b908 R08: 0000000000004000 R09: ffffc9000218b8c8
>> R10: 0000000000000000 R11: 0000000000000001 R12: ffffc9000218b8b6
>> R13: ffffc9000218b9ce R14: 0000000000000001 R15: ffff880480684a88
>> FS:  00007f7c7f998b40(0000) GS:ffff880507800000(0000) knlGS:0000000000000000
>> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> CR2: 0000000000000000 CR3: 000000044f15f000 CR4: 00000000001406f0
>> DR0: 00007f4ce439d000 DR1: 0000000000000000 DR2: 0000000000000000
>> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
>> Stack:
>>  ffff880501430000 d305ffffa00a2245 006c000000000002 0500000000000010
>>  6c000000000002d3 0000000000001000 000000006427eebb ffff880480684a88
>>  0000000000000000 ffff8804fddcf348 0000000000002000 0000000000000000
>> Call Trace:
>>  [<ffffffffa009cff0>] __btrfs_drop_extents+0xb00/0xe30 [btrfs]

We're going to bash on Josef's patch and probably send it with the next 
merge window (queued for stable as well).

https://patchwork.kernel.org/patch/9431679/

-chris