Re: 4.15.6 crash: BUG at fs/btrfs/ctree.c:1862

[Marc MERLIN]

On Tue, May 15, 2018 at 09:36:11AM +0100, Filipe Manana wrote:
> We got a fix for this recently:  https://patchwork.kernel.org/patch/10396523/

Thanks very much for the notice, sorry that I missed it.

Marc
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Re: 4.15.6 crash: BUG at fs/btrfs/ctree.c:1862

[Filipe Manana]

On Tue, May 15, 2018 at 12:10 AM, Marc MERLIN  wrote:
> static noinline struct extent_buffer *
> read_node_slot(struct btrfs_fs_info *fs_info, struct extent_buffer *parent,
>int slot)
> {
> int level = btrfs_header_level(parent);
> struct extent_buffer *eb;
>
> if (slot < 0 || slot >= btrfs_header_nritems(parent))
> return ERR_PTR(-ENOENT);
>
> BUG_ON(level == 0);
>
>
>
> BTRFS info (device dm-2): relocating block group 13404622290944 flags data
> BTRFS info (device dm-2): found 9959 extents
> BTRFS info (device dm-2): found 9959 extents
> BTRFS info (device dm-2): relocating block group 13403548549120 flags data
> [ cut here ]
> kernel BUG at fs/btrfs/ctree.c:1862!
> invalid opcode:  [#1] PREEMPT SMP PTI
> CPU: 5 PID: 8103 Comm: btrfs Tainted: G U   
> 4.15.6-amd64-preempt-sysrq-20171018 #3
> Hardware name: System manufacturer System Product Name/P8H67-M PRO, BIOS 3904 
> 04/27/2013
> RIP: 0010:read_node_slot+0x3c/0x9e
> RSP: 0018:becfaa0b7b58 EFLAGS: 00210246
> RAX: 00a0 RBX: 000c RCX: 0003
> RDX: 000c RSI: 9a60e9d9de78 RDI: 00052f6e
> RBP: 9a60e9d9de78 R08: 0001 R09: becfaa0b7bf6
> R10: 9a64988bd7e9 R11: 9a64988bd7c8 R12: e003d4bdb800
> R13: 9a64a481 R14:  R15: 
> FS:  7fba34c9c8c0() GS:9a64de34() knlGS:
> CS:  0010 DS:  ES:  CR0: 80050033
> CR2: 5a8b9c9a CR3: 0001446c6004 CR4: 001606e0
> Call Trace:
>  tree_advance+0xb1/0x11e
>  btrfs_compare_trees+0x1c2/0x4d6
>  ? process_extent+0xdcf/0xdcf
>  btrfs_ioctl_send+0x81e/0xc70
>  ? __kmalloc_track_caller+0xfb/0x10f
>  _btrfs_ioctl_send+0xbc/0xe6
>  ? paravirt_sched_clock+0x5/0x8
>  ? set_task_rq+0x2f/0x80
>  ? task_rq_unlock+0x22/0x36
>  btrfs_ioctl+0x162f/0x1dc8
>  ? select_task_rq_fair+0xb65/0xb7a
>  ? update_load_avg+0x16d/0x442
>  ? list_add+0x15/0x2e
>  ? cfs_rq_throttled.isra.30+0x9/0x18
>  ? vfs_ioctl+0x1b/0x28
>  vfs_ioctl+0x1b/0x28
>  do_vfs_ioctl+0x4f4/0x53f
>  ? __audit_syscall_entry+0xbf/0xe3
>  SyS_ioctl+0x52/0x76
>  do_syscall_64+0x72/0x81
>  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
> RIP: 0033:0x7fba34d835e7
> RSP: 002b:7ffc32cf4cb8 EFLAGS: 0202 ORIG_RAX: 0010
> RAX: ffda RBX: 523f RCX: 7fba34d835e7
> RDX: 7ffc32cf4d40 RSI: 40489426 RDI: 0004
> RBP: 0004 R08:  R09: 7fba34c9b700
> R10: 7fba34c9b9d0 R11: 0202 R12: 0003
> R13: 563a30b87020 R14: 0001 R15: 0001
> Code: f5 53 4c 8b a6 98 00 00 00 89 d3 4c 89 e7 e8 67 fd ff ff 85 db 78 63 4c 
> 89 e7 41 88 c6 e8 92 fb ff ff 39 d8 76 54 45 84 f6 75 02 <0f> 0b 89 de 48 89 
> ef e8 2e ff ff ff 89 de 49 89 c4 48 89 ef e8
> RIP: read_node_slot+0x3c/0x9e RSP: becfaa0b7b58
> ---[ end trace a24e7de6b77b5cb1 ]---
> Kernel panic - not syncing: Fatal exception
> Kernel Offset: 0x1900 from 0x8100 (relocation range: 
> 0x8000-0xbfff)

We got a fix for this recently:  https://patchwork.kernel.org/patch/10396523/


>
> --
> "A mouse is a device used to point at the xterm you want to type in" - A.S.R.
> Microsoft is to operating systems 
>    what McDonalds is to gourmet 
> cooking
> Home page: http://marc.merlins.org/   | PGP 
> 7F55D5F27AAF9D08
> --
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-- 
Filipe David Manana,

“Whether you think you can, or you think you can't — you're right.”
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