WARNING in ext4_discard_allocated

Date	Name	Commit	Repro	Result
2025/04/21	upstream (ToT)	9d7a0577c9db	C	[report] WARNING in ext4_discard_allocated_blocks

Date

Name

Commit

Repro

Result

2025/04/21

upstream (ToT)

9d7a0577c9db

[report] WARNING in ext4_discard_allocated_blocks

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-5.15	WARNING in ext4_discard_allocated_blocks missing-backport origin:upstream	syz			1	21d	182d	0/3	upstream: reported syz repro on 2024/12/25 21:07
upstream	WARNING in ext4_discard_allocated_blocks ext4	C	inconclusive	done	4	536d	653d	25/29	fixed on 2024/02/21 18:23

------------[ cut here ]------------ mb_load_buddy failed (-117) WARNING: CPU: 1 PID: 5957 at fs/ext4/mballoc.c:4313 ext4_discard_allocated_blocks+0x199/0x6d0 fs/ext4/mballoc.c:4313 Modules linked in: CPU: 1 PID: 5957 Comm: syz.0.99 Not tainted 6.1.134-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:ext4_discard_allocated_blocks+0x199/0x6d0 fs/ext4/mballoc.c:4313 Code: 0c 00 00 e8 39 27 ff ff 89 c3 31 ff 89 c6 e8 9e a3 4c ff 85 db 74 67 e8 35 a0 4c ff 48 c7 c7 80 9a 1f 8b 89 de e8 c7 e2 14 ff <0f> 0b e9 76 03 00 00 e8 1b a0 4c ff 49 83 c7 3c 4c 89 f8 48 c1 e8 RSP: 0018:ffffc900058ced20 EFLAGS: 00010246 RAX: edda4fb02316a300 RBX: 00000000ffffff8b RCX: ffff88802d4d8000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900058cee50 R08: ffffffff815291ce R09: ffffed10171e4f1c R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92000b19db0 R13: dffffc0000000000 R14: ffff8880745d75c4 R15: ffff8880745d7578 FS: 00007ff05f4996c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2284bffffc CR3: 000000005954d000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> ext4_mb_new_blocks+0x154e/0x4b80 fs/ext4/mballoc.c:-1 ext4_ext_map_blocks+0x1c1c/0x7ab0 fs/ext4/extents.c:4339 ext4_map_blocks+0xa2b/0x1cb0 fs/ext4/inode.c:678 _ext4_get_block+0x23b/0x660 fs/ext4/inode.c:821 ext4_block_write_begin+0x631/0x1400 fs/ext4/inode.c:1123 ext4_write_begin+0x638/0xf80 fs/ext4/ext4_jbd2.h:-1 ext4_da_write_begin+0x30a/0x9c0 fs/ext4/inode.c:2999 generic_perform_write+0x2fc/0x5e0 mm/filemap.c:3845 ext4_buffered_write_iter+0x122/0x3a0 fs/ext4/file.c:285 ext4_file_write_iter+0x1d7/0x1930 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+0x857/0xbc0 fs/read_write.c:584 ksys_write+0x19c/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0x80 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7ff05e58e169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff05f499038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ff05e7b5fa0 RCX: 00007ff05e58e169 RDX: 000000000000a000 RSI: 0000200000000780 RDI: 0000000000000005 RBP: 00007ff05e610a68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ff05e7b5fa0 R15: 00007ffc9ee22158 </TASK>

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2025/04/20 21:21	linux-6.1.y	420102835862	2a20f901	.config	console log	report	syz / log			[disk image] [vmlinux] [kernel image] [mounted in repro (clean fs)]	ci2-linux-6-1-kasan	WARNING in ext4_discard_allocated_blocks

Crashes (1):

Assets (help?)