------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2760!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 19437 Comm: syz.7.3863 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:ext4_writepages+0x2f34/0x2f40 fs/ext4/inode.c:2759
Code: c1 03 38 c1 0f 8c ac fd ff ff 4c 89 e7 e8 14 8e ac ff e9 9f fd ff ff e8 6a a2 5b ff 0f 0b e8 63 a2 5b ff 0f 0b e8 5c a2 5b ff <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 55 41 57 41 56 41 54 53 48 89
RSP: 0018:ffffc90005e276c0 EFLAGS: 00010293
RAX: ffffffff8226d154 RBX: 0000009410000000 RCX: ffff888026e45940
RDX: 0000000000000000 RSI: 0000008000000000 RDI: 0000000000000000
RBP: ffffc90005e27a30 R08: ffff88807dcb8a5f R09: 1ffff1100fb9714b
R10: dffffc0000000000 R11: ffffed100fb9714c R12: 1ffff92000bc4f84
R13: dffffc0000000000 R14: 0000008000000000 R15: ffff88804078e000
FS:  0000555580c9f500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c40f9e6 CR3: 000000001fb1c000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_writepages+0x3ba/0x640 mm/page-writeback.c:2491
 filemap_fdatawrite_wbc+0x11e/0x180 mm/filemap.c:388
 __filemap_fdatawrite_range mm/filemap.c:421 [inline]
 __filemap_fdatawrite mm/filemap.c:427 [inline]
 filemap_flush+0xe0/0x140 mm/filemap.c:454
 ext4_release_file+0x7e/0x300 fs/ext4/file.c:158
 __fput+0x22c/0x920 fs/file_table.c:320
 task_work_run+0x1d0/0x260 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f27cfb9aeb9
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:00007fffbfb09488 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f27cfe17da0 RCX: 00007f27cfb9aeb9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f27cfe17da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f27cfe17cb0 R11: 0000000000000246 R12: 0000000000178df3
R13: 00007f27cfe1618c R14: 0000000000178c49 R15: 00007f27cfe16180
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_writepages+0x2f34/0x2f40 fs/ext4/inode.c:2759
Code: c1 03 38 c1 0f 8c ac fd ff ff 4c 89 e7 e8 14 8e ac ff e9 9f fd ff ff e8 6a a2 5b ff 0f 0b e8 63 a2 5b ff 0f 0b e8 5c a2 5b ff <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 55 41 57 41 56 41 54 53 48 89
RSP: 0018:ffffc90005e276c0 EFLAGS: 00010293
RAX: ffffffff8226d154 RBX: 0000009410000000 RCX: ffff888026e45940
RDX: 0000000000000000 RSI: 0000008000000000 RDI: 0000000000000000
RBP: ffffc90005e27a30 R08: ffff88807dcb8a5f R09: 1ffff1100fb9714b
R10: dffffc0000000000 R11: ffffed100fb9714c R12: 1ffff92000bc4f84
R13: dffffc0000000000 R14: 0000008000000000 R15: ffff88804078e000
FS:  0000555580c9f500(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe04fecdb0 CR3: 000000001fb1c000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400