WARNING in udf_free_blocks (2)

Status: upstream: reported C repro on 2025/01/12 10:23
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+eee8568c73f195a7d8fa@syzkaller.appspotmail.com
First crash: 581d, last: 11h53m
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2025/01/12 upstream (ToT) b62cef9a5c67 C [report] KASAN: use-after-free Read in udf_unlink
▶ ▼ Similar bugs (6)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in udf_free_blocks -1 1 588d 588d 0/3 auto-obsoleted due to no activity on 2025/04/15 10:15
linux-5.15 WARNING in udf_free_blocks -1 1 826d 826d 0/3 auto-obsoleted due to no activity on 2024/08/21 03:04
upstream WARNING in udf_free_blocks (2) udf -1 1 971d 969d 0/29 auto-obsoleted due to no activity on 2024/03/29 02:59
upstream WARNING in udf_free_blocks (3) prio:high udf -1 syz, C error 5 54d 58d 2/29 upstream: reported C repro on 2026/06/20 03:58
upstream WARNING in udf_free_blocks udf -1 6 1100d 1219d 0/29 auto-obsoleted due to no activity on 2023/11/20 09:23
linux-6.1 WARNING in udf_free_blocks (2) origin:upstream -1 syz, C error 20 70d 420d 0/3 upstream: reported C repro on 2025/06/22 21:08
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2026/08/06 01:21 15m retest repro linux-5.15.y report log
2026/08/06 01:21 17m retest repro linux-5.15.y report log
2026/08/06 01:21 17m retest repro linux-5.15.y report log
2026/08/06 01:21 15m retest repro linux-5.15.y report log
2026/08/06 01:21 25m retest repro linux-5.15.y report log
2026/07/19 15:31 16m retest repro linux-5.15.y report log
2026/07/19 15:31 17m retest repro linux-5.15.y report log
2026/07/19 15:31 17m retest repro linux-5.15.y report log
2026/07/19 15:31 15m retest repro linux-5.15.y report log
2026/07/19 15:31 17m retest repro linux-5.15.y report log
▶ ▼ Fix bisection attempts (1)
Created Duration User Patch Repo Result
2025/07/30 17:00 2h47m bisect fix linux-5.15.y OK (0) job log log

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4309 at fs/udf/udfdecl.h:127 udf_updated_lvid fs/udf/udfdecl.h:125 [inline]
WARNING: CPU: 0 PID: 4309 at fs/udf/udfdecl.h:127 udf_add_free_space fs/udf/balloc.c:138 [inline]
WARNING: CPU: 0 PID: 4309 at fs/udf/udfdecl.h:127 udf_table_free_blocks fs/udf/balloc.c:398 [inline]
WARNING: CPU: 0 PID: 4309 at fs/udf/udfdecl.h:127 udf_free_blocks+0x1543/0x1810 fs/udf/balloc.c:687
Modules linked in:
CPU: 0 PID: 4309 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:udf_updated_lvid fs/udf/udfdecl.h:125 [inline]
RIP: 0010:udf_add_free_space fs/udf/balloc.c:138 [inline]
RIP: 0010:udf_table_free_blocks fs/udf/balloc.c:398 [inline]
RIP: 0010:udf_free_blocks+0x1543/0x1810 fs/udf/balloc.c:687
Code: 03 61 b2 fe 48 8b 9c 24 70 01 00 00 48 85 db 74 0a e8 f1 60 b2 fe e9 29 ff ff ff e8 e7 60 b2 fe e9 2e ff ff ff e8 dd 60 b2 fe <0f> 0b e9 c9 f5 ff ff 44 89 f1 80 e1 07 fe c1 38 c1 0f 8c 79 eb ff
RSP: 0018:ffffc900012ff6c0 EFLAGS: 00010293
RAX: ffffffff82c69bd3 RBX: 1ffff9200025ff54 RCX: ffff88801e238000
RDX: 0000000000000000 RSI: 000000002d1e460e RDI: 0000000000000000
RBP: ffffc900012ff8d0 R08: ffffc900012ff487 R09: 1ffff9200025fe90
R10: dffffc0000000000 R11: fffff5200025fe91 R12: dffffc0000000000
R13: 1ffff9200025fef4 R14: 000000002d1e460e R15: ffff88806a1a001f
FS:  0000555591144500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8f7e715000 CR3: 000000007b72b000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 extent_trunc+0x329/0x420 fs/udf/truncate.c:56
 udf_truncate_extents+0x326/0xdc0 fs/udf/truncate.c:212
 udf_setsize+0xd6a/0x10c0 fs/udf/inode.c:1183
 udf_evict_inode+0x74/0x3e0 fs/udf/inode.c:145
 evict+0x4b6/0x8b0 fs/inode.c:647
 do_unlinkat+0x3e7/0x710 fs/namei.c:4363
 __do_sys_unlink fs/namei.c:4404 [inline]
 __se_sys_unlink fs/namei.c:4402 [inline]
 __x64_sys_unlink+0x45/0x50 fs/namei.c:4402
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f7c44efa1c7
Code: 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffec10c71a8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7c44efa1c7
RDX: 00007ffec10c71d0 RSI: 00007ffec10c7260 RDI: 00007ffec10c7260
RBP: 00007ffec10c7260 R08: 00007ffec10c8260 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffec10c8350
R13: 00007f7c44f91474 R14: 000000000001263f R15: 00007ffec10ca510
 </TASK>

Crashes (39):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/16 21:26 linux-5.15.y aabd761612db 746171ee .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2026/08/16 20:34 linux-5.15.y aabd761612db 746171ee .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2026/08/16 19:50 linux-5.15.y aabd761612db 746171ee .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2026/05/31 12:03 linux-5.15.y 241d66fa280c 6b4a8443 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2 (corrupt fs)] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2026/03/08 09:54 linux-5.15.y 91d48252ad4b 5cb44a80 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2 (clean fs)] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2026/03/08 09:16 linux-5.15.y 91d48252ad4b 5cb44a80 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2 (clean fs)] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2026/03/08 08:36 linux-5.15.y 91d48252ad4b 5cb44a80 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2 (clean fs)] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2026/03/08 07:53 linux-5.15.y 91d48252ad4b 5cb44a80 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2 (clean fs)] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2026/01/01 18:30 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2 (corrupt fs)] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/12/25 05:38 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/12/19 13:04 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2 (clean fs)] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/09/17 12:06 linux-5.15.y 43bb85222e53 e2beed91 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1 (corrupt fs)] [mounted in repro #2] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/09/17 11:01 linux-5.15.y 43bb85222e53 e2beed91 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1 (corrupt fs)] [mounted in repro #2] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/09/17 09:50 linux-5.15.y 43bb85222e53 e2beed91 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1 (corrupt fs)] [mounted in repro #2] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/09/17 08:45 linux-5.15.y 43bb85222e53 e2beed91 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1 (corrupt fs)] [mounted in repro #2] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/09/04 01:04 linux-5.15.y 01879f56bdde 96a211bc .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/08/31 16:25 linux-5.15.y 01879f56bdde 807a3b61 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/08/31 14:50 linux-5.15.y 01879f56bdde 807a3b61 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/08/31 13:38 linux-5.15.y 01879f56bdde 807a3b61 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/05/29 16:44 linux-5.15.y 98f47d0e9b8c 3d2f584d .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/03/16 03:05 linux-5.15.y 0c935c049b5c e2826670 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/02/27 13:34 linux-5.15.y c16c81c81336 6a8fcbc4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/02/26 12:41 linux-5.15.y c16c81c81336 d34966d1 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/01/12 11:46 linux-5.15.y 4735586da88e 6dbc6a9b .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/01/12 11:06 linux-5.15.y 4735586da88e 6dbc6a9b .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/01/12 10:23 linux-5.15.y 4735586da88e 6dbc6a9b .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2026/02/15 17:10 linux-5.15.y e45d5d41c134 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2026/01/08 15:49 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/12/15 00:26 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/12/05 20:19 linux-5.15.y cc5ec8769306 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/11/01 06:16 linux-5.15.y cc5ec8769306 2c50b6a9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/10/24 12:17 linux-5.15.y ac56c046adf4 c0460fcd .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/10/12 23:35 linux-5.15.y 29e53a5b1c4f ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/09/17 14:52 linux-5.15.y 43bb85222e53 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/06/30 11:58 linux-5.15.y 3dea0e7f549e fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/04/30 18:35 linux-5.15.y f7347f400572 85a5a23f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/04/30 18:34 linux-5.15.y f7347f400572 85a5a23f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/04/30 18:34 linux-5.15.y f7347f400572 85a5a23f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in udf_free_blocks
2025/02/22 20:57 linux-5.15.y c16c81c81336 d34966d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in udf_free_blocks
* Struck through repros no longer work on HEAD.