EXT4-fs error (device loop0): ext4_mb_release_inode_pa:4375: group 0, free 0, pa_free 1
------------[ cut here ]------------
kernel BUG at fs/ext4/mballoc.c:3729!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 4316 Comm: syz.0.1078 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:ext4_mb_normalize_request+0x1291/0x12e0 fs/ext4/mballoc.c:3729
Code: ff ff 48 8b 7d a8 e8 ae 27 cb ff e9 6b fc ff ff e8 b4 a6 90 ff 0f 0b e8 ad a6 90 ff 0f 0b e8 a6 a6 90 ff 0f 0b e8 9f a6 90 ff <0f> 0b e8 98 a6 90 ff 0f 0b e8 91 a6 90 ff 48 8b 85 78 ff ff ff 42
RSP: 0018:ffffc90000dded30 EFLAGS: 00010287
RAX: ffffffff81d40fb1 RBX: 00000000000000b0 RCX: 0000000000080000
RDX: ffffc9000192c000 RSI: 0000000000054d32 RDI: 0000000000054d33
RBP: ffffc90000ddee10 R08: ffff8881338eef2f R09: 1ffff1102671dde5
R10: dffffc0000000000 R11: ffffed102671dde6 R12: ffff8881339a68e8
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000018
FS:  00007f3c743836c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000001b0bf CR3: 00000001275e8000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ext4_mb_new_blocks+0xc31/0x4340 fs/ext4/mballoc.c:5249
 ext4_ext_map_blocks+0x1679/0x5dd0 fs/ext4/extents.c:4335
 ext4_map_blocks+0x985/0x1bd0 fs/ext4/inode.c:674
 mpage_map_one_extent fs/ext4/inode.c:2452 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2505 [inline]
 ext4_writepages+0x136a/0x2eb0 fs/ext4/inode.c:2873
 do_writepages+0x128/0x280 mm/page-writeback.c:2380
 __filemap_fdatawrite_range+0x2a0/0x350 mm/filemap.c:427
 file_write_and_wait_range+0x8c/0x110 mm/filemap.c:766
 ext4_sync_file+0x1a9/0x9f0 fs/ext4/fsync.c:151
 vfs_fsync_range+0x190/0x1a0 fs/sync.c:202
 generic_write_sync include/linux/fs.h:2920 [inline]
 ext4_buffered_write_iter+0x59b/0x640 fs/ext4/file.c:278
 ext4_file_write_iter+0x53f/0x1980 fs/ext4/file.c:-1
 call_write_iter include/linux/fs.h:2066 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x758/0xdc0 fs/read_write.c:605
 ksys_pwrite64 fs/read_write.c:712 [inline]
 __do_sys_pwrite64 fs/read_write.c:722 [inline]
 __se_sys_pwrite64 fs/read_write.c:719 [inline]
 __x64_sys_pwrite64+0x197/0x220 fs/read_write.c:719
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f3c75928799
Code: ff c3 66 2e 0f 1f 84 00 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
RSP: 002b:00007f3c74383028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f3c75ba1fa0 RCX: 00007f3c75928799
RDX: 00000000200000c1 RSI: 00002000000000c0 RDI: 0000000000000006
RBP: 00007f3c759bebd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000009000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3c75ba2038 R14: 00007f3c75ba1fa0 R15: 00007fff47bf23d8
Modules linked in:
---[ end trace 6f5ef26ebfca47c7 ]---
RIP: 0010:ext4_mb_normalize_request+0x1291/0x12e0 fs/ext4/mballoc.c:3729
Code: ff ff 48 8b 7d a8 e8 ae 27 cb ff e9 6b fc ff ff e8 b4 a6 90 ff 0f 0b e8 ad a6 90 ff 0f 0b e8 a6 a6 90 ff 0f 0b e8 9f a6 90 ff <0f> 0b e8 98 a6 90 ff 0f 0b e8 91 a6 90 ff 48 8b 85 78 ff ff ff 42
RSP: 0018:ffffc90000dded30 EFLAGS: 00010287
RAX: ffffffff81d40fb1 RBX: 00000000000000b0 RCX: 0000000000080000
RDX: ffffc9000192c000 RSI: 0000000000054d32 RDI: 0000000000054d33
RBP: ffffc90000ddee10 R08: ffff8881338eef2f R09: 1ffff1102671dde5
R10: dffffc0000000000 R11: ffffed102671dde6 R12: ffff8881339a68e8
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000018
FS:  00007f3c743836c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6d953cf000 CR3: 00000001275e8000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400