syzbot


WARNING in udf_open_lvid

Status: upstream: reported on 2026/05/18 11:56
Subsystems: udf
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+0306b38d9ed6ef71467d@syzkaller.appspotmail.com
First crash: 28d, last: 1d13h
✨ AI Jobs (1)
ID Workflow Result Correct Ext Bug ID Bug Created Started Finished Revision Error
e848db50-8889-464c-8c1a-a8180ed47fc7 assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ✅ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ WARNING in udf_open_lvid 2026/05/30 11:51 2026/05/30 11:51 2026/05/30 12:48 6b4a844333e83556da95d61d7f207e7ef5cd4bc6
Discussions (1)
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[syzbot] [udf?] WARNING in udf_open_lvid 0 (1) 2026/05/18 11:56

Sample crash report:
Buffer I/O error on dev loop0, logical block 128, lost sync page write
------------[ cut here ]------------
!buffer_uptodate(bh)
WARNING: fs/buffer.c:1087 at mark_buffer_dirty+0x299/0x410 fs/buffer.c:1087, CPU#0: syz.0.0/5332
Modules linked in:
CPU: 0 UID: 0 PID: 5332 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:mark_buffer_dirty+0x299/0x410 fs/buffer.c:1087
Code: 4c 89 f7 e8 79 66 da ff 49 8b 3e be 40 00 00 00 5b 41 5c 41 5e 41 5f 5d e9 64 63 fb ff e8 0f 81 6d ff eb 8c e8 08 81 6d ff 90 <0f> 0b 90 e9 a5 fd ff ff e8 fa 80 6d ff 90 0f 0b 90 e9 cf fd ff ff
RSP: 0018:ffffc9000e06fbb0 EFLAGS: 00010287
RAX: ffffffff82584608 RBX: ffff888046e20910 RCX: 0000000000100000
RDX: ffffc90020001000 RSI: 0000000000000432 RDI: 0000000000000433
RBP: ffffc9000e06fc01 R08: ffff888046e20917 R09: 1ffff11008dc4122
R10: dffffc0000000000 R11: ffffed1008dc4123 R12: ffff888054c9a009
R13: 1ffff92001c0df84 R14: dffffc0000000000 R15: ffff888046e20910
FS:  00007f88949d46c0(0000) GS:ffff88808c894000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f88889ff000 CR3: 000000003fbe3000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 udf_open_lvid+0x38a/0x5d0 fs/udf/super.c:2078
 udf_reconfigure+0x336/0x540 fs/udf/super.c:679
 reconfigure_super+0x227/0x8a0 fs/super.c:1080
 vfs_cmd_reconfigure fs/fsopen.c:268 [inline]
 vfs_fsconfig_locked+0x171/0x320 fs/fsopen.c:297
 __do_sys_fsconfig fs/fsopen.c:463 [inline]
 __se_sys_fsconfig+0x6c9/0x820 fs/fsopen.c:350
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8893b9ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f88949d3fe8 EFLAGS: 00000246 ORIG_RAX: 00000000000001af
RAX: ffffffffffffffda RBX: 00007f8893e16090 RCX: 00007f8893b9ce59
RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000009
RBP: 00007f8893c32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8893e16128 R14: 00007f8893e16090 R15: 00007fffa5e58348
 </TASK>

Crashes (14):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/06/10 09:59 upstream 685441a6d3f1 34dab4be .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in udf_open_lvid
2026/06/10 08:03 upstream 685441a6d3f1 34dab4be .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in udf_open_lvid
2026/06/07 04:02 upstream 8e65320d91cd cc095639 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in udf_open_lvid
2026/06/07 00:32 upstream 8e65320d91cd cc095639 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in udf_open_lvid
2026/06/04 13:06 upstream ba3e43a9e601 197909be .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in udf_open_lvid
2026/06/04 10:44 upstream ba3e43a9e601 197909be .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in udf_open_lvid
2026/06/02 02:55 upstream e43ffb69e043 1095583b .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in udf_open_lvid
2026/05/30 21:55 upstream f5e5d3509bff 6b4a8443 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in udf_open_lvid
2026/05/30 01:58 upstream 9215e74f228f 6b4a8443 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in udf_open_lvid
2026/05/28 16:19 upstream eb3f4b7426cf 9a5a7e5e .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in udf_open_lvid
2026/05/23 07:09 upstream cca95436be15 c69befb3 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in udf_open_lvid
2026/05/17 07:39 upstream 6916d5703ddf de5aae85 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in udf_open_lvid
2026/05/15 06:35 upstream 66182ca873a4 6ccb967e .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in udf_open_lvid
2026/05/14 11:47 upstream e1914add2799 6ccb967e .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in udf_open_lvid
* Struck through repros no longer work on HEAD.