EXT4-fs error (device loop0): ext4_validate_block_bitmap:441: comm syz.0.3604: bg 0: block 40: padding at end of block bitmap is not set
------------[ cut here ]------------
WARNING: kernel/trace/blktrace.c:368 at __blk_add_trace+0x79c/0x8d0 kernel/trace/blktrace.c:367, CPU#1: syz.0.3604/19915
Modules linked in:
CPU: 1 UID: 0 PID: 19915 Comm: syz.0.3604 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:__blk_add_trace+0x79c/0x8d0 kernel/trace/blktrace.c:367
Code: ff 4d 85 e4 75 4f e8 83 0e f8 ff e9 fb fd ff ff e8 79 0e f8 ff e9 ec fd ff ff e8 6f 0e f8 ff e9 d8 fd ff ff e8 65 0e f8 ff 90 <0f> 0b 90 e9 ca fd ff ff e8 57 0e f8 ff 48 8b 7c 24 30 e8 cd 51 00
RSP: 0018:ffffc900041eea80 EFLAGS: 00010287
RAX: ffffffff81c81b4b RBX: 0000000000000001 RCX: 0000000000080000
RDX: ffffc900108bb000 RSI: 0000000000028f16 RDI: 0000000000028f17
RBP: ffffc900041eeb88 R08: ffff888026bb5ac0 R09: 0000000000000009
R10: 0000000000000011 R11: 0000000000000002 R12: 000000008000ffff
R13: ffff88807bda2400 R14: 00000000801a0001 R15: 0000000000000001
FS:  00007fc8cde746c0(0000) GS:ffff888126022000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7e1328ad58 CR3: 000000007d116000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000420
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 blk_add_trace_bio+0x2ab/0x2f0 kernel/trace/blktrace.c:1056
 __do_trace_block_bio_queue include/trace/events/block.h:391 [inline]
 trace_block_bio_queue include/trace/events/block.h:391 [inline]
 submit_bio_noacct_nocheck+0x9e2/0xa50 block/blk-core.c:735
 ext4_commit_super+0x2d2/0x430 fs/ext4/super.c:6234
 ext4_handle_error+0x672/0x960 fs/ext4/super.c:718
 __ext4_error+0x26a/0x380 fs/ext4/super.c:829
 ext4_validate_block_bitmap+0x64e/0x6c0 fs/ext4/balloc.c:-1
 ext4_mb_init_cache+0x55e/0x1490 fs/ext4/mballoc.c:1421
 ext4_mb_init_group+0x3a5/0x6b0 fs/ext4/mballoc.c:1612
 ext4_mb_load_buddy_gfp+0xca0/0xec0 fs/ext4/mballoc.c:1682
 ext4_mb_clear_bb fs/ext4/mballoc.c:6568 [inline]
 ext4_free_blocks+0xb49/0x1bf0 fs/ext4/mballoc.c:6770
 ext4_remove_blocks fs/ext4/extents.c:2551 [inline]
 ext4_ext_rm_leaf fs/ext4/extents.c:2716 [inline]
 ext4_ext_remove_space+0x1f87/0x42f0 fs/ext4/extents.c:2965
 ext4_ext_truncate+0x17e/0x300 fs/ext4/extents.c:4484
 ext4_truncate+0xb4f/0x12e0 fs/ext4/inode.c:4614
 ext4_process_orphan+0x1cb/0x300 fs/ext4/orphan.c:335
 ext4_orphan_cleanup+0xc20/0x1460 fs/ext4/orphan.c:470
 __ext4_fill_super fs/ext4/super.c:5617 [inline]
 ext4_fill_super+0x5920/0x61e0 fs/ext4/super.c:5736
 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1691
 vfs_get_tree+0x92/0x2b0 fs/super.c:1751
 fc_mount fs/namespace.c:1208 [inline]
 do_new_mount_fc fs/namespace.c:3651 [inline]
 do_new_mount+0x302/0xa10 fs/namespace.c:3727
 do_mount fs/namespace.c:4050 [inline]
 __do_sys_mount fs/namespace.c:4238 [inline]
 __se_sys_mount+0x313/0x410 fs/namespace.c:4215
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc8ccf9076a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007fc8cde73e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fc8cde73ef0 RCX: 00007fc8ccf9076a
RDX: 0000200000000080 RSI: 0000200000000000 RDI: 00007fc8cde73eb0
RBP: 0000200000000080 R08: 00007fc8cde73ef0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000000
R13: 00007fc8cde73eb0 R14: 00000000000004f2 R15: 0000200000000040
 </TASK>