------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2747!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 656 Comm: syz.2.95 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:ext4_writepages+0x3069/0x3090 fs/ext4/inode.c:2746
Code: 00 00 00 e8 d9 2a 8e ff 84 db 75 2c e8 40 28 8e ff 49 bc 00 00 00 00 00 fc ff df 48 8b 5c 24 20 e9 8e f7 ff ff e8 27 28 8e ff <0f> 0b e8 20 28 8e ff e8 e7 d5 24 ff eb a2 e8 14 28 8e ff e8 db d5
RSP: 0018:ffffc90000b77700 EFLAGS: 00010293
RAX: ffffffff81dba319 RBX: 000000d410000000 RCX: ffff88810cba0000
RDX: 0000000000000000 RSI: 0000008000000000 RDI: 0000000000000000
RBP: ffffc90000b77a70 R08: ffff8881344d11df R09: 1ffff1102689a23b
R10: dffffc0000000000 R11: ffffed102689a23c R12: dffffc0000000000
R13: 0000000000000001 R14: 0000008000000000 R15: ffff8881344d1470
FS:  0000555563ce7500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000240 CR3: 000000012b10f000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_writepages+0x473/0x6c0 mm/page-writeback.c:2388
 filemap_fdatawrite_wbc+0x1f4/0x250 mm/filemap.c:409
 __filemap_fdatawrite_range mm/filemap.c:442 [inline]
 __filemap_fdatawrite mm/filemap.c:448 [inline]
 filemap_flush+0xd4/0x130 mm/filemap.c:475
 ext4_alloc_da_blocks+0x7a/0x190 fs/ext4/inode.c:3164
 ext4_release_file+0x84/0x320 fs/ext4/file.c:143
 __fput+0x20b/0x8b0 fs/file_table.c:311
 ____fput+0x15/0x20 fs/file_table.c:339
 task_work_run+0x127/0x190 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f0710f74799
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:00007ffecef51e58 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffecef51f40 RCX: 00007f0710f74799
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00000000000097a8 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b2d620000 R11: 0000000000000246 R12: 00007ffecef51f80
R13: 00007f07111ee09c R14: 000000000000981e R15: 00007f07111ee090
 </TASK>
Modules linked in:
---[ end trace 881bf8c8d8352b2b ]---
RIP: 0010:ext4_writepages+0x3069/0x3090 fs/ext4/inode.c:2746
Code: 00 00 00 e8 d9 2a 8e ff 84 db 75 2c e8 40 28 8e ff 49 bc 00 00 00 00 00 fc ff df 48 8b 5c 24 20 e9 8e f7 ff ff e8 27 28 8e ff <0f> 0b e8 20 28 8e ff e8 e7 d5 24 ff eb a2 e8 14 28 8e ff e8 db d5
RSP: 0018:ffffc90000b77700 EFLAGS: 00010293
RAX: ffffffff81dba319 RBX: 000000d410000000 RCX: ffff88810cba0000
RDX: 0000000000000000 RSI: 0000008000000000 RDI: 0000000000000000
RBP: ffffc90000b77a70 R08: ffff8881344d11df R09: 1ffff1102689a23b
R10: dffffc0000000000 R11: ffffed102689a23c R12: dffffc0000000000
R13: 0000000000000001 R14: 0000008000000000 R15: ffff8881344d1470
FS:  0000555563ce7500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3a534e0e80 CR3: 000000012b10f000 CR4: 00000000003526a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400