UBSAN: shift-out-of-bounds in ext4_check_opt

Date	Name	Commit	Repro	Result
2026/01/06	lts (merge base)	f6e38ae624cf	C	[report] UBSAN: shift-out-of-bounds in ext4_check_opt_consistency
2026/01/06	upstream (ToT)	7f98ab9da046	C	Didn't crash

Date

Name

Commit

Repro

Result

2026/01/06

lts (merge base)

f6e38ae624cf

[report] UBSAN: shift-out-of-bounds in ext4_check_opt_consistency

2026/01/06

upstream (ToT)

7f98ab9da046

Didn't crash


Created	Duration	User	Repo	Result
2026/04/02 02:54	6m	retest repro	android14-6.1	report log
2026/04/02 02:54	7m	retest repro	android14-6.1	report log
2026/04/02 02:52	5m	retest repro	android14-6.1	report log
2026/02/28 20:10	8m	retest repro	android14-6.1	report log
2026/01/22 02:40	6m	retest repro	android14-6.1	report log
2026/01/22 02:40	6m	retest repro	android14-6.1	report log
2026/01/22 02:40	6m	retest repro	android14-6.1	report log

loop2: detected capacity change from 0 to 2048 EXT4-fs (loop2): mounted filesystem without journal. Quota mode: none. ================================================================================ UBSAN: shift-out-of-bounds in fs/ext4/super.c:2706:15 shift exponent 1953789044 is too large for 32-bit type 'int' CPU: 0 PID: 363 Comm: syz.2.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: <TASK> __dump_stack+0x21/0x24 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 dump_stack+0x15/0x24 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 ext4_check_opt_consistency+0x138d/0x1720 fs/ext4/super.c:2706 ext4_reconfigure+0xca/0x2830 fs/ext4/super.c:6675 reconfigure_super+0x228/0x8a0 fs/super.c:982 do_remount fs/namespace.c:2742 [inline] path_mount+0xdb5/0xfc0 fs/namespace.c:3403 do_mount fs/namespace.c:3424 [inline] __do_sys_mount fs/namespace.c:3632 [inline] __se_sys_mount+0x320/0x390 fs/namespace.c:3609 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3609 x64_sys_call+0x65d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f8a12b9c819 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:00007fff8a8feb38 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f8a12e15fa0 RCX: 00007f8a12b9c819 RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000000 RBP: 00007f8a12c32c91 R08: 0000200000000000 R09: 0000000000000000 R10: 0000000002200020 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8a12e15fac R14: 00007f8a12e15fa0 R15: 00007f8a12e15fa0 </TASK> ================================================================================ EXT4-fs: test_dummy_encryption requires encrypt feature

Crashes (6):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/04/04 09:03	android14-6.1	9ab204675a62	4440e7c2	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image] [mounted in repro #1 (clean fs)] [mounted in repro #2 (clean fs)]	ci2-android-6-1	UBSAN: shift-out-of-bounds in ext4_check_opt_consistency
2026/02/14 14:51	android14-6.1	edbe3e111301	1e62d198	.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-6-1	UBSAN: shift-out-of-bounds in ext4_check_opt_consistency
2026/01/05 07:07	android14-6.1	5e6db7045704	d6526ea3	.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-6-1	UBSAN: shift-out-of-bounds in ext4_check_opt_consistency
2026/01/05 06:38	android14-6.1	5e6db7045704	d6526ea3	.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-6-1	UBSAN: shift-out-of-bounds in ext4_check_opt_consistency
2026/01/05 06:09	android14-6.1	5e6db7045704	d6526ea3	.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-6-1	UBSAN: shift-out-of-bounds in ext4_check_opt_consistency
2026/01/05 05:37	android14-6.1	5e6db7045704	d6526ea3	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-android-6-1	UBSAN: shift-out-of-bounds in ext4_check_opt_consistency

Crashes (6):

Assets (help?)