syzbot
kernel BUG in __extent_writepage_io
Status:
fixed on 2024/05/18 00:35
Subsystems:
btrfs
[Documentation on labels]
Reported-by: syzbot+06006fc4a90bff8e8f17@syzkaller.appspotmail.com
Fix commit:
5571e41ec6e5
btrfs: don't drop extent_map for free space inode on write error
First crash: 1008d, last: 886d
Fix bisection:
the issue occurs on the latest tested release
(bisect log)
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Last patch testing requests (2)
Sample crash report:
assertion failed: block_start != EXTENT_MAP_HOLE, in fs/btrfs/extent_io.c:1356
------------[ cut here ]------------
kernel BUG at fs/btrfs/extent_io.c:1356!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 12 Comm: kworker/u4:1 Not tainted 6.7.0-rc5-syzkaller-00030-geaadbbaaff74 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Workqueue: writeback wb_workfn (flush-btrfs-137)
RIP: 0010:__extent_writepage_io+0xcd5/0xd00 fs/btrfs/extent_io.c:1356
Code: 77 07 90 0f 0b e8 fb 23 f1 fd 48 c7 c7 80 c5 ab 8b 48 c7 c6 80 d2 ab 8b 48 c7 c2 20 c5 ab 8b b9 4c 05 00 00 e8 7c 49 77 07 90 <0f> 0b e8 d4 23 f1 fd 48 8b 3c 24 e8 db 22 01 00 48 89 c7 48 c7 c6
RSP: 0018:ffffc90000116f40 EFLAGS: 00010246
RAX: 000000000000004e RBX: 0000000000000000 RCX: 759e2408fa89b300
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: fffffffffffffffd R08: ffffffff81713a3c R09: 1ffff92000022d3c
R10: dffffc0000000000 R11: fffff52000022d3d R12: 0000000000007000
R13: 0000000000007000 R14: ffffea00019cd168 R15: ffff888027a0b680
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f54a22c2723 CR3: 000000001d013000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__extent_writepage fs/btrfs/extent_io.c:1446 [inline]
extent_write_cache_pages fs/btrfs/extent_io.c:2108 [inline]
extent_writepages+0x1260/0x26a0 fs/btrfs/extent_io.c:2230
do_writepages+0x3a6/0x670 mm/page-writeback.c:2553
__writeback_single_inode+0x155/0xfc0 fs/fs-writeback.c:1625
writeback_sb_inodes+0x8e3/0x1220 fs/fs-writeback.c:1916
wb_writeback+0x44d/0xc70 fs/fs-writeback.c:2092
wb_do_writeback fs/fs-writeback.c:2239 [inline]
wb_workfn+0x400/0xfb0 fs/fs-writeback.c:2279
process_one_work kernel/workqueue.c:2627 [inline]
process_scheduled_works+0x90f/0x1420 kernel/workqueue.c:2700
worker_thread+0xa5f/0x1000 kernel/workqueue.c:2781
kthread+0x2d3/0x370 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__extent_writepage_io+0xcd5/0xd00 fs/btrfs/extent_io.c:1356
Code: 77 07 90 0f 0b e8 fb 23 f1 fd 48 c7 c7 80 c5 ab 8b 48 c7 c6 80 d2 ab 8b 48 c7 c2 20 c5 ab 8b b9 4c 05 00 00 e8 7c 49 77 07 90 <0f> 0b e8 d4 23 f1 fd 48 8b 3c 24 e8 db 22 01 00 48 89 c7 48 c7 c6
RSP: 0018:ffffc90000116f40 EFLAGS: 00010246
RAX: 000000000000004e RBX: 0000000000000000 RCX: 759e2408fa89b300
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: fffffffffffffffd R08: ffffffff81713a3c R09: 1ffff92000022d3c
R10: dffffc0000000000 R11: fffff52000022d3d R12: 0000000000007000
R13: 0000000000007000 R14: ffffea00019cd168 R15: ffff888027a0b680
FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fac72b5f000 CR3: 000000001d013000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
* Struck through repros no longer work on HEAD.