kernel BUG in ext4_split_extent

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	kernel BUG in ext4_split_extent_at ext4	-1				1	1499d	1495d	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	21	7d01h	1013d	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	814d	1009d	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	552d	1013d	0/2	auto-obsoleted due to no activity on 2024/12/21 09:12
android-6-1	kernel BUG in ext4_split_extent_at (2) origin:lts	-1	C		done	1	246d	246d	0/2	auto-obsoleted due to no activity on 2025/10/22 23:15
upstream	kernel BUG in ext4_split_extent_at (3) ext4	-1				3	249d	264d	0/29	auto-obsoleted due to no activity on 2025/10/19 20:03
linux-6.1	kernel BUG in ext4_split_extent_at	-1	C			2	7d02h	7d06h	0/3	upstream: reported C repro on 2026/03/11 06:35
android-5-15	kernel BUG in ext4_split_extent_at missing-backport origin:upstream	-1	C	error	error	11	11d	293d	0/2	upstream: reported C repro on 2025/05/29 02:28

------------[ cut here ]------------ kernel BUG at fs/ext4/extents.c:3187! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 1445 Comm: syz.6.291 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:ext4_split_extent_at+0xf50/0xf70 fs/ext4/extents.c:3187 Code: ff ff 44 89 f1 80 e1 07 fe c1 38 c1 0f 8c 45 fb ff ff 4c 89 f7 49 89 f7 e8 3d bc cf ff 4c 89 fe e9 32 fb ff ff e8 10 8a 8a ff <0f> 0b e8 09 8a 8a ff 0f 0b e8 02 8a 8a ff 0f 0b e8 fb 89 8a ff 0f RSP: 0018:ffffc90000dee360 EFLAGS: 00010293 RAX: ffffffff81e6e2f0 RBX: 0000000000000008 RCX: ffff888121866540 RDX: 0000000000000000 RSI: 0000000000000019 RDI: 00000000000000b0 RBP: ffffc90000dee4d8 R08: 0000000000000010 R09: 000000000000043b R10: dffffc0000000000 R11: ffffed102945fe4a R12: dffffc0000000000 R13: 0000000000000011 R14: 0000000000000010 R15: ffff88814a2ff200 FS: 00007eff0c4836c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000032000 CR3: 000000012a683000 CR4: 00000000003526b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> ext4_split_extent+0x363/0x4c0 fs/ext4/extents.c:3385 ext4_split_convert_extents fs/ext4/extents.c:3715 [inline] ext4_ext_handle_unwritten_extents fs/ext4/extents.c:3876 [inline] ext4_ext_map_blocks+0x10e5/0x61d0 fs/ext4/extents.c:4231 ext4_map_blocks+0x9d8/0x1b70 fs/ext4/inode.c:679 mpage_map_one_extent fs/ext4/inode.c:2435 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2488 [inline] ext4_writepages+0x1409/0x30e0 fs/ext4/inode.c:2856 do_writepages+0x3a4/0x5f0 mm/page-writeback.c:2494 filemap_fdatawrite_wbc+0x128/0x190 mm/filemap.c:408 __filemap_fdatawrite_range mm/filemap.c:441 [inline] file_write_and_wait_range+0x159/0x230 mm/filemap.c:794 ext4_sync_file+0x1a9/0xa10 fs/ext4/fsync.c:151 vfs_fsync_range+0x1a1/0x1b0 fs/sync.c:188 generic_write_sync include/linux/fs.h:2980 [inline] ext4_buffered_write_iter+0x573/0x630 fs/ext4/file.c:292 ext4_file_write_iter+0x191/0x1500 fs/ext4/file.c:-1 __kernel_write_iter+0x296/0x660 fs/read_write.c:517 dump_emit_page fs/coredump.c:886 [inline] dump_user_range+0x40b/0x660 fs/coredump.c:913 elf_core_dump+0x2b52/0x3060 fs/binfmt_elf.c:2354 do_coredump+0x15d3/0x2240 fs/coredump.c:760 get_signal+0x11db/0x1520 kernel/signal.c:2877 arch_do_signal_or_restart+0xd1/0x1140 arch/x86/kernel/signal.c:871 exit_to_user_mode_loop+0x7a/0xb0 kernel/entry/common.c:174 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210 irqentry_exit_to_user_mode+0x9/0x10 kernel/entry/common.c:316 irqentry_exit+0x12/0x40 kernel/entry/common.c:419 exc_page_fault+0x5e/0xb0 arch/x86/mm/fault.c:1520 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:608 RIP: 0033:0x7eff0b59c7a1 Code: 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 83 c8 ff c3 66 2e 0f 1f RSP: 002b:fffffffffffffe70 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007eff0b815fa0 RCX: 00007eff0b59c799 RDX: 0000000000000000 RSI: fffffffffffffe70 RDI: 0000000000008000 RBP: 00007eff0b632bd9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007eff0b816038 R14: 00007eff0b815fa0 R15: 00007ffc1627ab18 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ext4_split_extent_at+0xf50/0xf70 fs/ext4/extents.c:3187 Code: ff ff 44 89 f1 80 e1 07 fe c1 38 c1 0f 8c 45 fb ff ff 4c 89 f7 49 89 f7 e8 3d bc cf ff 4c 89 fe e9 32 fb ff ff e8 10 8a 8a ff <0f> 0b e8 09 8a 8a ff 0f 0b e8 02 8a 8a ff 0f 0b e8 fb 89 8a ff 0f RSP: 0018:ffffc90000dee360 EFLAGS: 00010293 RAX: ffffffff81e6e2f0 RBX: 0000000000000008 RCX: ffff888121866540 RDX: 0000000000000000 RSI: 0000000000000019 RDI: 00000000000000b0 RBP: ffffc90000dee4d8 R08: 0000000000000010 R09: 000000000000043b R10: dffffc0000000000 R11: ffffed102945fe4a R12: dffffc0000000000 R13: 0000000000000011 R14: 0000000000000010 R15: ffff88814a2ff200 FS: 00007eff0c4836c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff9c997ea4 CR3: 000000012a683000 CR4: 00000000003526a0 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
2026/03/09 11:35	android14-6.1	6bfa51973214	5cb44a80	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-android-6-1	kernel BUG in ext4_split_extent_at

Crashes (1):

Assets (help?)