kernel BUG in ext4_split_extent

Date	Name	Commit	Repro	Result
2025/07/15	lts (merge base)	58485ff1a74f	C	[report] KASAN: use-after-free Read in ext4_find_extent
2025/07/15	upstream (ToT)	155a3c003e55	C	Didn't crash

Date

Name

Commit

Repro

Result

2025/07/15

lts (merge base)

58485ff1a74f

[report] KASAN: use-after-free Read in ext4_find_extent

2025/07/15

upstream (ToT)

155a3c003e55

Didn't crash

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	kernel BUG in ext4_split_extent_at ext4	-1				1	1259d	1255d	0/29	auto-closed as invalid on 2022/06/08 01:32
android-5-10	kernel BUG in ext4_split_extent_at	-1	C	error	error	10	14d	773d	0/2	upstream: reported C repro on 2023/06/09 00:07
upstream	kernel BUG in ext4_split_extent_at (2) ext4	-1	C	error	done	3	574d	769d	25/29	fixed on 2024/01/30 15:47
android-6-1	kernel BUG in ext4_split_extent_at missing-backport origin:upstream	-1	C	error	error	1	312d	773d	0/2	auto-obsoleted due to no activity on 2024/12/21 09:12
upstream	kernel BUG in ext4_split_extent_at (3) ext4	-1				3	9d13h	24d	0/29	upstream: reported on 2025/06/26 14:29
android-5-15	kernel BUG in ext4_split_extent_at missing-backport origin:lts	-1	C	error	error	2	33d	53d	0/2	upstream: reported C repro on 2025/05/29 02:28

------------[ cut here ]------------ kernel BUG at fs/ext4/extents.c:3186! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 304 Comm: syz-executor221 Not tainted 6.1.141-syzkaller-00038-ge2deb0b42a3a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:ext4_split_extent_at+0xf92/0xfb0 fs/ext4/extents.c:3186 Code: c9 fa ff ff 48 89 df 49 89 f7 e8 39 7c d0 ff 4c 89 fe e9 b6 fa ff ff e8 bc 22 8c ff 0f 0b e8 b5 22 8c ff 0f 0b e8 ae 22 8c ff <0f> 0b e8 a7 22 8c ff 0f 0b e8 a0 22 8c ff 0f 0b e8 99 22 8c ff 0f RSP: 0018:ffffc90000ee7920 EFLAGS: 00010293 RAX: ffffffff81e3d4c2 RBX: 0000000000000010 RCX: ffff88810df79440 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000010 RBP: ffffc90000ee7a90 R08: 0000000000000000 R09: 0000000050000028 R10: ffffed1021df822a R11: 1ffff11021df8228 R12: ffff88810efc1100 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f390a70d6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f250cd8d000 CR3: 000000012391f000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> ext4_force_split_extent_at fs/ext4/extents.c:338 [inline] ext4_ext_remove_space+0x349d/0x3fb0 fs/ext4/extents.c:2880 ext4_punch_hole+0x77c/0xbd0 fs/ext4/inode.c:4141 ext4_fallocate+0x2b6/0x1dd0 fs/ext4/extents.c:4760 vfs_fallocate+0x4c5/0x5a0 fs/open.c:324 ksys_fallocate fs/open.c:347 [inline] __do_sys_fallocate fs/open.c:355 [inline] __se_sys_fallocate fs/open.c:353 [inline] __x64_sys_fallocate+0xc0/0x110 fs/open.c:353 x64_sys_call+0x7fa/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:286 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f390a7508f9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 18 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f390a70d218 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f390a7e9608 RCX: 00007f390a7508f9 RDX: 0000000000000004 RSI: 0000000000000003 RDI: 0000000000000004 RBP: 00007f390a7e9600 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000010000 R11: 0000000000000246 R12: 00007f390a7b5b08 R13: 00007f390a7a40c0 R14: 0000200000010143 R15: 0000200000010140 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ext4_split_extent_at+0xf92/0xfb0 fs/ext4/extents.c:3186 Code: c9 fa ff ff 48 89 df 49 89 f7 e8 39 7c d0 ff 4c 89 fe e9 b6 fa ff ff e8 bc 22 8c ff 0f 0b e8 b5 22 8c ff 0f 0b e8 ae 22 8c ff <0f> 0b e8 a7 22 8c ff 0f 0b e8 a0 22 8c ff 0f 0b e8 99 22 8c ff 0f RSP: 0018:ffffc90000ee7920 EFLAGS: 00010293 RAX: ffffffff81e3d4c2 RBX: 0000000000000010 RCX: ffff88810df79440 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000010 RBP: ffffc90000ee7a90 R08: 0000000000000000 R09: 0000000050000028 R10: ffffed1021df822a R11: 1ffff11021df8228 R12: ffff88810efc1100 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f390a70d6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f250cd8d000 CR3: 000000012391f000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2025/07/14 23:14	android14-6.1	e2deb0b42a3a	d8fc7335	.config	strace 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	kernel BUG in ext4_split_extent_at

Crashes (1):

Assets (help?)