kernel BUG in ext4_ext_insert

Kernel	Title	Rank 🛈	Repro	Cause bisect	Count	Last	Reported	Patched	Status
upstream	kernel BUG in ext4_ext_insert_extent (2) ext4	-1	C	done	33	21d	283d	0/29	upstream: reported C repro on 2025/04/11 16:16
android-54	kernel BUG in ext4_ext_insert_extent	-1			1	1456d	1456d	0/2	auto-closed as invalid on 2022/05/24 20:39
upstream	kernel BUG in ext4_ext_insert_extent ext4	-1			1	1782d	1778d	0/29	auto-closed as invalid on 2021/06/02 20:11

Kernel

Title

Rank 🛈

upstream

kernel BUG in ext4_ext_insert_extent (2) ext4

-1

done

21d

283d

0/29

upstream: reported C repro on 2025/04/11 16:16

android-54

kernel BUG in ext4_ext_insert_extent

-1

1456d

0/2

auto-closed as invalid on 2022/05/24 20:39

upstream

kernel BUG in ext4_ext_insert_extent ext4

-1

1782d

1778d

0/29

auto-closed as invalid on 2021/06/02 20:11


Created	Duration	User	Repo	Result
2026/01/02 20:57	11m	retest repro	android13-5.10-lts	report log
2025/12/18 19:17	8m	retest repro	android13-5.10-lts	report log
2025/12/18 19:17	6m	retest repro	android13-5.10-lts	report log
2025/10/09 02:12	18m	retest repro	android13-5.10-lts	report log
2025/10/09 02:12	18m	retest repro	android13-5.10-lts	report log

EXT4-fs (loop5): dirty_blocks=0 EXT4-fs (loop5): Block reservation details EXT4-fs (loop5): i_reserved_data_blocks=0 ------------[ cut here ]------------ kernel BUG at fs/ext4/extents.c:2135! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 425 Comm: kworker/u4:5 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: ext4-rsv-conversion ext4_end_io_rsv_work RIP: 0010:ext4_ext_insert_extent+0x44fa/0x4530 fs/ext4/extents.c:2135 Code: ff ff 89 d9 80 e1 07 fe c1 38 c1 0f 8c 01 e9 ff ff 48 89 df e8 57 e2 d4 ff e9 f4 e8 ff ff e8 ed f3 9a ff 0f 0b e8 e6 f3 9a ff <0f> 0b e8 df f3 9a ff 0f 0b 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 43 RSP: 0018:ffffc90001177500 EFLAGS: 00010293 RAX: ffffffff81c8b09a RBX: ffff8881115e9400 RCX: ffff888112864f00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900011776b0 R08: dffffc0000000000 R09: ffffed102204ffa5 R10: ffffed102204ffa5 R11: 1ffff1102204ffa4 R12: 0000000000000000 R13: 1ffff11025e3cee8 R14: ffff8881115e9460 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f37f336e867 CR3: 000000010d2e0000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ext4_ext_map_blocks+0x17b5/0x5d80 fs/ext4/extents.c:4356 ext4_map_blocks+0x978/0x1bc0 fs/ext4/inode.c:674 ext4_convert_unwritten_extents+0x21c/0x3f0 fs/ext4/extents.c:4862 ext4_convert_unwritten_io_end_vec+0x103/0x180 fs/ext4/extents.c:4901 ext4_end_io_end fs/ext4/page-io.c:189 [inline] ext4_do_flush_completed_IO fs/ext4/page-io.c:262 [inline] ext4_end_io_rsv_work+0x2b9/0x600 fs/ext4/page-io.c:276 process_one_work+0x6e1/0xba0 kernel/workqueue.c:2301 worker_thread+0xa6a/0x13b0 kernel/workqueue.c:2447 kthread+0x346/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Modules linked in: ---[ end trace 4c9d1baebaa3481d ]--- RIP: 0010:ext4_ext_insert_extent+0x44fa/0x4530 fs/ext4/extents.c:2135 Code: ff ff 89 d9 80 e1 07 fe c1 38 c1 0f 8c 01 e9 ff ff 48 89 df e8 57 e2 d4 ff e9 f4 e8 ff ff e8 ed f3 9a ff 0f 0b e8 e6 f3 9a ff <0f> 0b e8 df f3 9a ff 0f 0b 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 43 RSP: 0018:ffffc90001177500 EFLAGS: 00010293 RAX: ffffffff81c8b09a RBX: ffff8881115e9400 RCX: ffff888112864f00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900011776b0 R08: dffffc0000000000 R09: ffffed102204ffa5 R10: ffffed102204ffa5 R11: 1ffff1102204ffa4 R12: 0000000000000000 R13: 1ffff11025e3cee8 R14: ffff8881115e9460 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f37f336e867 CR3: 000000010d0bb000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (3):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	Assets (help?)	Manager	Title
2025/12/19 12:24	android13-5.10-lts	e253c52bbdfc	d6526ea3	.config	console log	report	syz / log	[disk image] [vmlinux] [kernel image] [mounted in repro #1 (corrupt fs)] [mounted in repro #2 (corrupt fs)]	ci2-android-5-10	kernel BUG in ext4_ext_insert_extent
2025/09/23 23:01	android13-5.10-lts	911f602c2237	e667a34f	.config	console log	report	syz / log	[disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)]	ci2-android-5-10	kernel BUG in ext4_ext_insert_extent
2025/09/23 22:41	android13-5.10-lts	911f602c2237	e667a34f	.config	console log	report	syz / log	[disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)]	ci2-android-5-10	kernel BUG in ext4_ext_insert_extent

Crashes (3):

Assets (help?)