------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2747!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 4563 Comm: syz.5.1370 Tainted: G        W         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 79 2a 8e ff 84 db 75 2c e8 e0 27 8e ff 49 bc 00 00 00 00 00 fc ff df 48 8b 5c 24 20 e9 8e f7 ff ff e8 c7 27 8e ff <0f> 0b e8 c0 27 8e ff e8 e7 d9 24 ff eb a2 e8 b4 27 8e ff e8 db d9
RSP: 0018:ffffc90000bf7700 EFLAGS: 00010293
RAX: ffffffff81db9f19 RBX: 0000009c10000000 RCX: ffff888117aa8000
RDX: 0000000000000000 RSI: 0000008000000000 RDI: 0000000000000000
RBP: ffffc90000bf7a70 R08: ffff888144c95227 R09: 1ffff11028992a44
R10: dffffc0000000000 R11: ffffed1028992a45 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000008000000000 R15: ffff888144c954b8
FS:  000055556df3d500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f92d5625f00 CR3: 000000011e45c000 CR4: 00000000003526a0
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: 0033:0x7f92d55d8819
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:00007ffc7d52d028 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f92d5853da0 RCX: 00007f92d55d8819
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f92d5853da0 R08: 00007f92d5852218 R09: 0000000000000000
R10: 000000000003fc6c R11: 0000000000000246 R12: 00000000000260ab
R13: 00007f92d585209c R14: 0000000000025e82 R15: 00007f92d5852090
 </TASK>
Modules linked in:
---[ end trace a51012ba82d416ef ]---
RIP: 0010:ext4_writepages+0x3069/0x3090 fs/ext4/inode.c:2746
Code: 00 00 00 e8 79 2a 8e ff 84 db 75 2c e8 e0 27 8e ff 49 bc 00 00 00 00 00 fc ff df 48 8b 5c 24 20 e9 8e f7 ff ff e8 c7 27 8e ff <0f> 0b e8 c0 27 8e ff e8 e7 d9 24 ff eb a2 e8 b4 27 8e ff e8 db d9
RSP: 0018:ffffc90000bf7700 EFLAGS: 00010293
RAX: ffffffff81db9f19 RBX: 0000009c10000000 RCX: ffff888117aa8000
RDX: 0000000000000000 RSI: 0000008000000000 RDI: 0000000000000000
RBP: ffffc90000bf7a70 R08: ffff888144c95227 R09: 1ffff11028992a44
R10: dffffc0000000000 R11: ffffed1028992a45 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000008000000000 R15: ffff888144c954b8
FS:  000055556df3d500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f92d5625f00 CR3: 000000011e45c000 CR4: 00000000003526a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400