------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2778!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 4271 Comm: syz.2.1102 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:ext4_writepages+0x2e8c/0x2eb0 fs/ext4/inode.c:2777
Code: 00 00 00 e8 16 da 92 ff 84 db 75 2c e8 7d d7 92 ff 49 bc 00 00 00 00 00 fc ff df 4c 8b 7c 24 18 e9 cb d4 ff ff e8 64 d7 92 ff <0f> 0b e8 5d d7 92 ff e8 b4 91 2e ff eb 9d e8 51 d7 92 ff e8 a8 91
RSP: 0018:ffffc9000125f7c0 EFLAGS: 00010293
RAX: ffffffff81d1dbec RBX: 0000009c10000000 RCX: ffff88811e7fbb40
RDX: 0000000000000000 RSI: 0000008000000000 RDI: 0000000000000000
RBP: ffffc9000125fb30 R08: ffff88812971eaa7 R09: 1ffff110252e3d54
R10: dffffc0000000000 R11: ffffed10252e3d55 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000008000000000 R15: 1ffff9200024bf24
FS:  000055556868d500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fef0b1b8000 CR3: 0000000125232000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_writepages+0x128/0x280 mm/page-writeback.c:2380
 __filemap_fdatawrite_range+0x2a0/0x350 mm/filemap.c:427
 __filemap_fdatawrite mm/filemap.c:435 [inline]
 filemap_flush+0x23/0x30 mm/filemap.c:462
 ext4_alloc_da_blocks+0x7a/0x190 fs/ext4/inode.c:3250
 ext4_release_file+0x84/0x320 fs/ext4/file.c:144
 __fput+0x2fb/0x770 fs/file_table.c:281
 ____fput+0x15/0x20 fs/file_table.c:314
 task_work_run+0x127/0x190 kernel/task_work.c:189
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop+0xcb/0xe0 kernel/entry/common.c:172
 exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:199
 syscall_exit_to_user_mode+0x1d/0x40 kernel/entry/common.c:274
 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fbb657a4819
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:00007ffcf1e91a88 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fbb65a1fda0 RCX: 00007fbb657a4819
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fbb65a1fda0 R08: 00007fbb65a1e038 R09: 0000000000000000
R10: 000000000003fd34 R11: 0000000000000246 R12: 0000000000028f10
R13: 00007fbb65a1e18c R14: 0000000000028dfe R15: 00007fbb65a1e180
Modules linked in:
---[ end trace c456b7ea6a8b25cc ]---
RIP: 0010:ext4_writepages+0x2e8c/0x2eb0 fs/ext4/inode.c:2777
Code: 00 00 00 e8 16 da 92 ff 84 db 75 2c e8 7d d7 92 ff 49 bc 00 00 00 00 00 fc ff df 4c 8b 7c 24 18 e9 cb d4 ff ff e8 64 d7 92 ff <0f> 0b e8 5d d7 92 ff e8 b4 91 2e ff eb 9d e8 51 d7 92 ff e8 a8 91
RSP: 0018:ffffc9000125f7c0 EFLAGS: 00010293
RAX: ffffffff81d1dbec RBX: 0000009c10000000 RCX: ffff88811e7fbb40
RDX: 0000000000000000 RSI: 0000008000000000 RDI: 0000000000000000
RBP: ffffc9000125fb30 R08: ffff88812971eaa7 R09: 1ffff110252e3d54
R10: dffffc0000000000 R11: ffffed10252e3d55 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000008000000000 R15: 1ffff9200024bf24
FS:  000055556868d500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa130f90bd0 CR3: 0000000125232000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400