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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: 1151d, last: 3h43m
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 C inconclusive 295 11h03m 567d 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 C unreliable 448 13d 835d 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 C 574 8h55m 564d 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 OK 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:
EXT4-fs (loop2): Ignoring removed nobh option
================================================================================
UBSAN: shift-out-of-bounds in fs/ext4/super.c:2493:15
shift exponent 2537464646 is too large for 32-bit type 'int'
CPU: 1 PID: 447 Comm: syz.2.40 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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+0x37c/0x400 lib/ubsan.c:321
 parse_options+0x23fb/0x2480 fs/ext4/super.c:2493
 ext4_fill_super+0x1d32/0x8bd0 fs/ext4/super.c:4208
 mount_bdev+0x2ae/0x3e0 fs/super.c:1400
 ext4_mount+0x34/0x40 fs/ext4/super.c:6648
 legacy_get_tree+0xed/0x190 fs/fs_context.c:611
 vfs_get_tree+0x89/0x260 fs/super.c:1530
 do_new_mount+0x25a/0xa20 fs/namespace.c:3034
 path_mount+0x659/0xff0 fs/namespace.c:3364
 do_mount fs/namespace.c:3377 [inline]
 __do_sys_mount fs/namespace.c:3585 [inline]
 __se_sys_mount+0x320/0x390 fs/namespace.c:3562
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3562
 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: 0033:0x7fb8faa4f8ca
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb8fa8b0e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fb8fa8b0ee0 RCX: 00007fb8faa4f8ca
RDX: 0000200000000400 RSI: 0000200000000440 RDI: 00007fb8fa8b0ea0
RBP: 0000200000000400 R08: 00007fb8fa8b0ee0 R09: 0000000000000050
R10: 0000000000000050 R11: 0000000000000246 R12: 0000200000000440
R13: 00007fb8fa8b0ea0 R14: 00000000000003eb R15: 0000200000000280
 </TASK>
================================================================================
EXT4-fs (loop2): Encoding requested by superblock is unknown

Crashes (1504):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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
2026/03/04 16:01 android13-5.15-lts e714749f59d3 e6b6b96b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/03/04 10:56 android13-5.15-lts e714749f59d3 4180d919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/03/04 05:36 android13-5.15-lts e714749f59d3 4180d919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/03/03 22:31 android13-5.15-lts e714749f59d3 4180d919 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/03/03 00:05 android13-5.15-lts e714749f59d3 b9dd6534 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/03/02 20:32 android13-5.15-lts e714749f59d3 b9dd6534 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/03/02 11:35 android13-5.15-lts e714749f59d3 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/03/02 09:35 android13-5.15-lts e714749f59d3 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/03/02 08:31 android13-5.15-lts e714749f59d3 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/03/02 05:42 android13-5.15-lts e714749f59d3 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/03/02 03:34 android13-5.15-lts e714749f59d3 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/03/01 23:13 android13-5.15-lts e714749f59d3 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/03/01 22:04 android13-5.15-lts e714749f59d3 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/03/01 17:04 android13-5.15-lts e714749f59d3 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/03/01 15:26 android13-5.15-lts e714749f59d3 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/03/01 09:23 android13-5.15-lts e714749f59d3 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/03/01 06:58 android13-5.15-lts e714749f59d3 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/03/01 04:17 android13-5.15-lts e714749f59d3 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/03/01 00:37 android13-5.15-lts e714749f59d3 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/28 18:19 android13-5.15-lts e714749f59d3 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/28 16:28 android13-5.15-lts e714749f59d3 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/28 13:08 android13-5.15-lts e714749f59d3 43249bac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/27 23:09 android13-5.15-lts e714749f59d3 2cf092b8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/27 13:56 android13-5.15-lts e714749f59d3 a2f13f71 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/27 10:57 android13-5.15-lts e714749f59d3 a2f13f71 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/27 05:55 android13-5.15-lts e714749f59d3 a2f13f71 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/26 10:02 android13-5.15-lts 13d6d33696ef e0f78d93 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/26 03:33 android13-5.15-lts 13d6d33696ef e0f78d93 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/25 08:09 android13-5.15-lts 13d6d33696ef 787dfb7c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/25 05:24 android13-5.15-lts 13d6d33696ef 787dfb7c .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/24 17:54 android13-5.15-lts 13d6d33696ef 96b1aa46 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/24 08:31 android13-5.15-lts 13d6d33696ef 41d2fa6a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/24 07:25 android13-5.15-lts 13d6d33696ef 41d2fa6a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/24 03:07 android13-5.15-lts 13d6d33696ef 41d2fa6a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/23 18:40 android13-5.15-lts 13d6d33696ef 6beca497 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/23 17:50 android13-5.15-lts 13d6d33696ef 6beca497 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/23 08:12 android13-5.15-lts 13d6d33696ef 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/23 04:44 android13-5.15-lts 13d6d33696ef 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/23 00:05 android13-5.15-lts 13d6d33696ef 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/22 21:28 android13-5.15-lts 13d6d33696ef 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/22 18:45 android13-5.15-lts 13d6d33696ef 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/22 12:25 android13-5.15-lts 13d6d33696ef 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/22 10:37 android13-5.15-lts 13d6d33696ef 6e7b5511 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 UBSAN: shift-out-of-bounds in parse_options
2026/02/22 08:30 android13-5.15-lts 13d6d33696ef 6e7b5511 .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.