UBSAN: shift-out-of-bounds in parse_options

Status: upstream: reported C repro on 2023/01/08 05:56
Bug presence: origin:lts
Subsystems: ext4
[Documentation on labels]
Reported-by: syzbot+298c1c62e38088db169c@syzkaller.appspotmail.com
First crash: 1374d, last: 10h34m
Cause bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2023/10/28 lts (merge base) 12952a23a5da C [report] UBSAN: shift-out-of-bounds in parse_options
2023/10/28 upstream (ToT) 56567a20b22b C Didn't crash
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 UBSAN: shift-out-of-bounds in parse_options origin:lts-only -1 syz, C inconclusive 397 2d22h 790d 0/3 upstream: reported C repro on 2024/08/13 23:52
linux-5.15 UBSAN: shift-out-of-bounds in parse_options origin:lts-only -1 syz, C unreliable 485 4d09h 1058d 0/3 upstream: reported C repro on 2023/11/19 20:08
android-6-1 UBSAN: shift-out-of-bounds in parse_options origin:lts -1 syz, C 1198 1d03h 787d 0/2 upstream: reported C repro on 2024/08/17 08:59
▶ ▼ Last patch testing requests (2)
Created Duration User Patch Repo Result
2023/04/12 05:56 22m tudor.ambarus@linaro.org git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev no crash log
2023/04/07 11:02 12m tudor.ambarus@linaro.org git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git linux-5.15.y report log
▶ ▼ Fix bisection attempts (8)
Created Duration User Patch Repo Result
2024/06/03 21:48 50m bisect fix android13-5.15-lts OK (0) job log log
2023/12/16 15:24 36m bisect fix android13-5.15-lts OK (0) job log log
2023/10/28 01:39 34m bisect fix android13-5.15-lts OK (0) job log log
2023/06/09 23:50 16m bisect fix android13-5.15-lts OK (0) job log log
2023/05/10 18:57 41m bisect fix android13-5.15-lts OK (0) job log log
2023/04/09 01:19 22m bisect fix android13-5.15-lts OK (0) job log log
2023/03/09 18:29 45m bisect fix android13-5.15-lts OK (0) job log log
2023/02/07 17:54 18m bisect fix android13-5.15-lts OK (0) job log log

Sample crash report:
F2FS-fs (loop0): Invalid log_blocksize (64), supports only 12
F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock
================================================================================
UBSAN: shift-out-of-bounds in fs/f2fs/super.c:934:5
shift exponent 140 is too large for 32-bit type 'int'
CPU: 1 PID: 303 Comm: syz-executor252 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 dump_stack+0x15/0x20 lib/dump_stack.c:113
 ubsan_epilogue+0xe/0x40 lib/ubsan.c:151
 __ubsan_handle_shift_out_of_bounds+0x364/0x3f0 lib/ubsan.c:321
 parse_options+0x476a/0x4790 fs/f2fs/super.c:935
 f2fs_fill_super+0x1f09/0x6dd0 fs/f2fs/super.c:4247
 mount_bdev+0x28d/0x3c0 fs/super.c:1411
 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4713
 legacy_get_tree+0xed/0x190 fs/fs_context.c:611
 vfs_get_tree+0x89/0x260 fs/super.c:1541
 do_new_mount+0x251/0xb40 fs/namespace.c:3037
 path_mount+0x640/0xff0 fs/namespace.c:3367
 do_mount fs/namespace.c:3380 [inline]
 __do_sys_mount fs/namespace.c:3588 [inline]
 __se_sys_mount+0x320/0x390 fs/namespace.c:3565
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3565
 x64_sys_call+0x6bf/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166
 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: 0033:0x7f9cdc46979a
Code: 56 53 b8 9d 00 00 00 0f 05 83 f8 ea 75 a2 c7 05 f4 32 09 00 00 00 00 00 eb 96 e8 61 05 00 00 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff9202f778 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fff9202f790 RCX: 00007f9cdc46979a
RDX: 0000200000000140 RSI: 0000200000000240 RDI: 00007fff9202f790
RBP: 0000200000000240 R08: 00007fff9202f7d0 R09: 0000000000000000
R10: 0000000001800004 R11: 0000000000000286 R12: 0000200000000140
R13: 00007fff9202f7d0 R14: 0000000000000003 R15: 0000000001800004
 </TASK>
================================================================================
F2FS-fs (loop0): Not support 4096, larger than 256

Crashes (2463):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/08 23:27 android13-5.15-lts d6c8aee048e0 b2734a59 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/06 09:30 android13-5.15-lts f5eaed2bbe33 f7710056 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/06/28 05:28 android13-5.15-lts c85054db4618 fb92f11c .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/06/27 01:08 android13-5.15-lts c85054db4618 fb92f11c .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/05/16 19:15 android13-5.15-lts 7f4b368e0410 a15a64a6 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/05/11 17:40 android13-5.15-lts 5628bb722180 845acb1c .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1 (corrupt fs)] [mounted in repro #2 (corrupt fs)] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/04/29 01:44 android13-5.15-lts e63ebedc51b2 95008c03 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/04/15 06:18 android13-5.15-lts 7fad219d720d e2e976a8 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/03/19 18:22 android13-5.15-lts 60dba25bf158 bd6dcb30 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/22 06:38 android13-5.15-lts 13d6d33696ef 6e7b5511 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1 (clean fs)] [mounted in repro #2 (corrupt fs)] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/14 00:35 android13-5.15-lts 13d6d33696ef 1e62d198 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/01/07 11:15 android13-5.15-lts 050dc55b0457 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2025/12/01 16:59 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1 (clean fs)] [mounted in repro #2 (clean fs)] [mounted in repro #3 (corrupt fs)] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2025/11/26 16:45 android13-5.15-lts 057fdbf6d3c7 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2025/11/22 01:42 android13-5.15-lts 057fdbf6d3c7 4fb8ef37 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2025/09/16 05:16 android13-5.15-lts 8d934e0056f7 e2beed91 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2025/08/10 03:44 android13-5.15-lts f32b52534f1d 32a0e5ed .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2025/06/21 16:31 android13-5.15-lts e678c93d43cc d6cdfb8a .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2025/05/19 16:09 android13-5.15-lts 57725b368731 b84f0537 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2025/04/01 11:08 android13-5.15-lts 5e1b899f19c3 36d76a97 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2025/02/02 04:51 android13-5.15-lts d1a25a6a4b3b 568559e4 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2025/02/01 02:51 android13-5.15-lts d1a25a6a4b3b aa47157c .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2025/01/30 06:53 android13-5.15-lts d1a25a6a4b3b afe4eff5 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2024/12/15 03:15 android13-5.15-lts 6f0de8f8a165 7cbfbb3a .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2024/10/17 14:28 android13-5.15-lts 5e4635681cf1 666f77ed .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2024/07/07 14:28 android13-5.15-lts 9044d25b8ff5 2a40360c .config strace log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro #1] [mounted in repro #2] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2023/12/28 08:08 android13-5.15-lts 28e3f5851a99 fb427a07 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2023/11/02 05:55 android13-5.15-lts 61cfd264993d 69904c9f .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2023/07/03 09:57 android13-5.15-lts 241da2ad5601 bfc47836 .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2023/01/08 05:54 android13-5.15-lts c73b4619ad86 1dac8c7a .config strace log report syz C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2025/07/30 10:24 android13-5.15-lts f32b52534f1d f8f2b4da .config console log report syz / log [disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/12 23:35 android13-5.15-lts d6c8aee048e0 745a967f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/12 21:41 android13-5.15-lts d6c8aee048e0 745a967f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/12 03:56 android13-5.15-lts d6c8aee048e0 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/11 23:59 android13-5.15-lts d6c8aee048e0 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/11 10:56 android13-5.15-lts d6c8aee048e0 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/11 09:01 android13-5.15-lts d6c8aee048e0 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/10 22:25 android13-5.15-lts d6c8aee048e0 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/10 15:26 android13-5.15-lts d6c8aee048e0 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/10 09:39 android13-5.15-lts d6c8aee048e0 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/10 04:55 android13-5.15-lts d6c8aee048e0 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/09 14:04 android13-5.15-lts d6c8aee048e0 b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/08 18:58 android13-5.15-lts d6c8aee048e0 b2734a59 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/07 23:10 android13-5.15-lts d6c8aee048e0 6520ecdb .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/07 16:17 android13-5.15-lts d6c8aee048e0 6520ecdb .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/07 14:19 android13-5.15-lts d6c8aee048e0 6520ecdb .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/07 05:49 android13-5.15-lts f5eaed2bbe33 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/06 23:04 android13-5.15-lts f5eaed2bbe33 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/06 16:12 android13-5.15-lts f5eaed2bbe33 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/06 09:06 android13-5.15-lts f5eaed2bbe33 f7710056 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/05 07:22 android13-5.15-lts f5eaed2bbe33 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/05 05:44 android13-5.15-lts f5eaed2bbe33 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/04 23:46 android13-5.15-lts f5eaed2bbe33 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/04 17:56 android13-5.15-lts f5eaed2bbe33 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/04 12:05 android13-5.15-lts f5eaed2bbe33 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/03 18:27 android13-5.15-lts f5eaed2bbe33 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/03 13:47 android13-5.15-lts f5eaed2bbe33 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/03 11:32 android13-5.15-lts f5eaed2bbe33 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/03 09:40 android13-5.15-lts f5eaed2bbe33 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/03 03:14 android13-5.15-lts f5eaed2bbe33 57bbd979 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/10/01 08:54 android13-5.15-lts 17730f38b70b 38f7f0d1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/09/29 13:33 android13-5.15-lts 64205e2c7d13 7bf4ea23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/09/29 06:15 android13-5.15-lts 64205e2c7d13 7bf4ea23 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/09/27 20:05 android13-5.15-lts 776976664f31 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/09/27 16:26 android13-5.15-lts 776976664f31 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/09/27 08:54 android13-5.15-lts 776976664f31 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/09/27 07:43 android13-5.15-lts 776976664f31 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/09/27 02:26 android13-5.15-lts 776976664f31 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/09/27 00:35 android13-5.15-lts 776976664f31 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/09/26 12:01 android13-5.15-lts 776976664f31 a3c7249d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/09/24 19:07 android13-5.15-lts 5bfe2b8c1439 3c3cdf19 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/09/23 23:27 android13-5.15-lts 5bfe2b8c1439 abce1216 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/09/23 12:27 android13-5.15-lts 5bfe2b8c1439 abce1216 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/09/22 12:17 android13-5.15-lts 5bfe2b8c1439 e12281bd .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/09/22 04:07 android13-5.15-lts 5bfe2b8c1439 853b104b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
* Struck through repros no longer work on HEAD.