kernel BUG in ext4_mb_use_inode

Date	Name	Commit	Repro	Result
2026/03/11	upstream (ToT)	b29fb8829bff	syz	Failed due to an error; will retry later

Date

Name

Commit

Repro

Result

2026/03/11

upstream (ToT)

b29fb8829bff

syz

Failed due to an error; will retry later

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
android-5-10	kernel BUG in ext4_mb_use_inode_pa	-1	syz			2	8d20h	8d21h	0/2	premoderation: reported syz repro on 2026/03/09 22:43
upstream	kernel BUG in ext4_mb_use_inode_pa ext4	-1	C	error	done	2	1261d	1261d	22/29	fixed on 2023/02/24 13:50
upstream	kernel BUG in ext4_mb_use_inode_pa (2) ext4	-1	C	error		280	21d	587d	0/29	upstream: reported C repro on 2024/08/08 04:33
android-5-15	kernel BUG in ext4_mb_use_inode_pa origin:lts	-1	C			5	8d04h	24d	0/2	upstream: reported C repro on 2026/02/22 04:22

------------[ cut here ]------------ kernel BUG at fs/ext4/mballoc.c:4360! Internal error: Oops - BUG: 00000000f2000800 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 5593 Comm: syz.1.237 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026 pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : ext4_mb_use_inode_pa+0x550/0x5a0 fs/ext4/mballoc.c:4360 lr : ext4_mb_use_inode_pa+0x550/0x5a0 fs/ext4/mballoc.c:4360 sp : ffff800023de6b40 x29: ffff800023de6b90 x28: ffff0000f68ebaa0 x27: 0000000000000003 x26: 0000000000000201 x25: ffff0000f68eba64 x24: 1fffe0001ed1d74c x23: dfff800000000000 x22: 00000000ffffffff x21: 1fffe0001c0b1249 x20: 0000000000000002 x19: ffff0000e0589248 x18: ffff800011b8bf60 x17: 1fffe00033ea877e x16: ffff8000082ee970 x15: 0000000000000000 x14: 0000000000000001 x13: 1fffe0001c0b1246 x12: 0000000000ff0100 x11: ff00800008dbeef4 x10: 0000000000000000 x9 : ffff800008dbeef4 x8 : ffff0000d4cdb780 x7 : ffff800008dac99c x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff0000f68eba5c x2 : ffff0000f68eba60 x1 : 0000000000000003 x0 : 0000000000000002 Call trace: ext4_mb_use_inode_pa+0x550/0x5a0 fs/ext4/mballoc.c:4360 ext4_mb_use_preallocated+0xc00/0xe34 fs/ext4/mballoc.c:4458 ext4_mb_new_blocks+0x5e4/0x4338 fs/ext4/mballoc.c:5765 ext4_ext_map_blocks+0x1394/0x56f4 fs/ext4/extents.c:4346 ext4_map_blocks+0x860/0x1778 fs/ext4/inode.c:679 _ext4_get_block+0x19c/0x4d8 fs/ext4/inode.c:822 ext4_get_block_unwritten+0x3c/0x110 fs/ext4/inode.c:855 ext4_block_write_begin+0x50c/0x10e4 fs/ext4/inode.c:1124 ext4_write_begin+0x5f4/0x131c fs/ext4/ext4_jbd2.h:-1 ext4_da_write_begin+0x348/0x990 fs/ext4/inode.c:3000 generic_perform_write+0x234/0x4f4 mm/filemap.c:3862 ext4_buffered_write_iter+0x2c4/0x528 fs/ext4/file.c:285 ext4_file_write_iter+0x18c/0x1574 fs/ext4/file.c:-1 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x3ec/0x7f0 fs/read_write.c:584 ksys_pwrite64 fs/read_write.c:699 [inline] __do_sys_pwrite64 fs/read_write.c:709 [inline] __se_sys_pwrite64 fs/read_write.c:706 [inline] __arm64_sys_pwrite64+0x174/0x20c fs/read_write.c:706 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Code: d4210000 97dbb0f4 d4210000 97dbb0f2 (d4210000) ---[ end trace 0000000000000000 ]---

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/03/11 09:28	linux-6.1.y	f2ddafa93a25	86914af9	.config	console log	report	syz / log			[disk image] [vmlinux] [kernel image] [mounted in repro (corrupt fs)]	ci2-linux-6-1-kasan-arm64	kernel BUG in ext4_mb_use_inode_pa

Crashes (1):

Assets (help?)