syzbot


kernel BUG in __block_commit_write

Status: auto-obsoleted due to no activity on 2023/12/12 18:06
Reported-by: syzbot+b6b3207f83da4a0b485b@syzkaller.appspotmail.com
First crash: 257d, last: 257d
Cause bisection: failed (error log, bisect log)
  
Fix bisection: failed (error log, bisect log)
  
Bug presence (2)
Date Name Commit Repro Result
2023/09/13 lts (merge base) b1644a0031cf C Didn't crash
2023/09/13 upstream (ToT) 3669558bdf35 C Didn't crash
Similar bugs (7)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel BUG at fs/buffer.c:LINE! nilfs C done error 567 49d 2230d 26/26 fixed on 2024/04/10 03:59
android-6-1 kernel BUG in __block_commit_write (2) origin:upstream C error 1 13d 130d 0/2 upstream: reported C repro on 2024/01/19 10:04
linux-4.14 kernel BUG at fs/buffer.c:LINE! C error 59 463d 1857d 0/1 upstream: reported C repro on 2019/04/27 19:47
android-5-10 kernel BUG in __block_commit_write 1 258d 258d 0/2 auto-obsoleted due to no activity on 2023/12/12 11:41
linux-4.19 kernel BUG at fs/buffer.c:LINE! (2) udf ext4 C error 31 470d 1284d 0/1 upstream: reported C repro on 2020/11/21 07:48
android-54 kernel BUG at fs/buffer.c:LINE! ext4 C 547 12h45m 1589d 0/2 upstream: reported C repro on 2020/01/21 13:12
android-5-10 kernel BUG in __block_commit_write (2) syz error 2 69d 132d 0/2 premoderation: reported syz repro on 2024/01/17 04:07

Sample crash report:
------------[ cut here ]------------
kernel BUG at fs/buffer.c:2097!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 345 Comm: syz-executor.1 Not tainted 6.1.25-syzkaller-00005-g7579b22626ff #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
RIP: 0010:__block_commit_write+0x27d/0x280 fs/buffer.c:2097
Code: ff 48 8b 5d b8 48 89 df be 08 00 00 00 e8 bb 16 e7 ff f0 80 0b 04 48 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 e3 bd a0 ff <0f> 0b 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 28 4c 89
RSP: 0018:ffffc90001347170 EFLAGS: 00010293
RAX: ffffffff81d4211d RBX: 0000000000000000 RCX: ffff88810f2b5100
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900013471c0 R08: ffffffff81d41f02 R09: fffff940009111b1
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000001
R13: 00000000000000d7 R14: 4800000000000057 R15: ffffea0004888d80
FS:  00007fc94fb546c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f261adc0d00 CR3: 0000000125170000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 block_write_end+0x47/0x90 fs/buffer.c:2187
 ext4_write_end+0x218/0x910 fs/ext4/inode.c:1323
 ext4_da_write_end+0x88/0x970 fs/ext4/inode.c:3071
 generic_perform_write+0x3e6/0x5c0 mm/filemap.c:3777
 ext4_buffered_write_iter+0x360/0x640 fs/ext4/file.c:285
 ext4_file_write_iter+0x194/0x1cf0
 do_iter_write+0x6e6/0xc50 fs/read_write.c:861
 vfs_iter_write+0x7c/0xa0 fs/read_write.c:902
 iter_file_splice_write+0x7f8/0xf90 fs/splice.c:686
 do_splice_from fs/splice.c:764 [inline]
 direct_splice_actor+0xff/0x130 fs/splice.c:931
 splice_direct_to_actor+0x4b4/0xbb0 fs/splice.c:886
 do_splice_direct+0x27f/0x3c0 fs/splice.c:974
 do_sendfile+0x616/0xfe0 fs/read_write.c:1255
 __do_sys_sendfile64 fs/read_write.c:1323 [inline]
 __se_sys_sendfile64 fs/read_write.c:1309 [inline]
 __x64_sys_sendfile64+0x1ce/0x230 fs/read_write.c:1309
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fc94ee7cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc94fb540c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fc94ef9bf80 RCX: 00007fc94ee7cae9
RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000006
RBP: 00007fc94eec847a R08: 0000000000000000 R09: 0000000000000000
R10: 000080001d00c0d0 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fc94ef9bf80 R15: 00007ffed735f7d8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__block_commit_write+0x27d/0x280 fs/buffer.c:2097
Code: ff 48 8b 5d b8 48 89 df be 08 00 00 00 e8 bb 16 e7 ff f0 80 0b 04 48 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 e3 bd a0 ff <0f> 0b 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 28 4c 89
RSP: 0018:ffffc90001347170 EFLAGS: 00010293
RAX: ffffffff81d4211d RBX: 0000000000000000 RCX: ffff88810f2b5100
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900013471c0 R08: ffffffff81d41f02 R09: fffff940009111b1
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000001
R13: 00000000000000d7 R14: 4800000000000057 R15: ffffea0004888d80
FS:  00007fc94fb546c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0c46cd7086 CR3: 0000000125170000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/09/13 18:06 android14-6.1 7579b22626ff 0b6a67ac .config console log report syz [mounted in repro] ci2-android-6-1 kernel BUG in __block_commit_write
* Struck through repros no longer work on HEAD.