syzbot


WARNING in udf_process_sequence

Status: upstream: reported C repro on 2025/08/18 02:08
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+8b744cf90a7a14692145@syzkaller.appspotmail.com
First crash: 10d, last: 6d18h
Bug presence (2)
Date Name Commit Repro Result
2025/08/22 linux-6.6.y (ToT) bb9c90ab9c5a C [report] WARNING in udf_process_sequence
2025/08/22 upstream (ToT) 3957a5720157 C Didn't crash
Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in udf_process_sequence origin:lts-only -1 C 4 5d16h 11d 0/3 upstream: reported C repro on 2025/08/17 23:30
linux-5.15 WARNING in udf_process_sequence origin:lts-only -1 C 4 3d02h 10d 0/3 upstream: reported C repro on 2025/08/17 23:47
upstream WARNING in udf_process_sequence udf -1 C error 1 49d 48d 28/29 upstream: reported C repro on 2025/07/11 16:44

Sample crash report:
syz.0.17[5947]: memfd_create() called without MFD_EXEC or MFD_NOEXEC_SEAL set
loop0: detected capacity change from 0 to 2048
UDF-fs: error (device loop0): udf_read_tagged: tag checksum failed, block 98: 0x1f != 0x1e
UDF-fs: warning (device loop0): udf_verify_domain_identifier: Not OSTA UDF compliant logical volume descriptor.
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5947 at mm/page_alloc.c:4433 __alloc_pages+0x2de/0x460 mm/page_alloc.c:4433
Modules linked in:
CPU: 1 PID: 5947 Comm: syz.0.17 Not tainted 6.6.102-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__alloc_pages+0x2de/0x460 mm/page_alloc.c:4433
Code: 0c 25 28 00 00 00 48 3b 8c 24 a0 00 00 00 0f 85 a0 00 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 c6 05 75 33 64 0c 01 <0f> 0b eb a5 a9 00 00 08 00 8b 74 24 0c 75 3e 44 89 f1 81 e1 7f ff
RSP: 0018:ffffc90003257460 EFLAGS: 00010246
RAX: ffffc90003257400 RBX: 1ffff9200064ae90 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc900032574c8
RBP: ffffc90003257560 R08: ffffc900032574c7 R09: 0000000000000000
R10: ffffc900032574a0 R11: fffff5200064ae99 R12: 0000000000000013
R13: 0000000000000000 R14: 0000000000040dc0 R15: dffffc0000000000
FS:  0000555586da0500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e587b47788 CR3: 0000000078f7b000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 __alloc_pages_node include/linux/gfp.h:237 [inline]
 alloc_pages_node include/linux/gfp.h:260 [inline]
 __kmalloc_large_node+0x8c/0x1e0 mm/slab_common.c:1148
 __do_kmalloc_node mm/slab_common.c:995 [inline]
 __kmalloc+0x111/0x240 mm/slab_common.c:1020
 kmalloc_array include/linux/slab.h:637 [inline]
 kcalloc include/linux/slab.h:668 [inline]
 udf_sb_alloc_partition_maps fs/udf/super.c:256 [inline]
 udf_load_logicalvol fs/udf/super.c:1433 [inline]
 udf_process_sequence+0x1cb3/0x4660 fs/udf/super.c:1789
 udf_load_sequence fs/udf/super.c:1836 [inline]
 udf_check_anchor_block+0x28d/0x540 fs/udf/super.c:1871
 udf_scan_anchors fs/udf/super.c:1904 [inline]
 udf_load_vrs+0x593/0xf00 fs/udf/super.c:1985
 udf_fill_super+0x67d/0x1720 fs/udf/super.c:2163
 mount_bdev+0x22b/0x2d0 fs/super.c:1643
 legacy_get_tree+0xea/0x180 fs/fs_context.c:662
 vfs_get_tree+0x8c/0x280 fs/super.c:1764
 do_new_mount+0x24b/0xa40 fs/namespace.c:3371
 do_mount fs/namespace.c:3711 [inline]
 __do_sys_mount fs/namespace.c:3920 [inline]
 __se_sys_mount+0x2da/0x3c0 fs/namespace.c:3897
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f58e219038a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffcb50f678 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fffcb50f700 RCX: 00007f58e219038a
RDX: 0000200000000c40 RSI: 00002000000000c0 RDI: 00007fffcb50f6c0
RBP: 0000200000000c40 R08: 00007fffcb50f700 R09: 0000000001800801
R10: 0000000001800801 R11: 0000000000000246 R12: 00002000000000c0
R13: 00007fffcb50f6c0 R14: 0000000000000c6b R15: 0000200000000000
 </TASK>

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/08/18 02:38 linux-6.6.y bb9c90ab9c5a 1804e95e .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-6-6-kasan WARNING in udf_process_sequence
2025/08/18 02:10 linux-6.6.y bb9c90ab9c5a 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in udf_process_sequence
2025/08/18 02:07 linux-6.6.y bb9c90ab9c5a 1804e95e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan WARNING in udf_process_sequence
* Struck through repros no longer work on HEAD.