syzbot

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kernel BUG at fs/ext4/inode.c:2760!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 9050 Comm: syz.0.922 Not tainted 6.1.148-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:ext4_writepages+0x2e41/0x2e50 fs/ext4/inode.c:2759
Code: c1 03 38 c1 0f 8c ac fd ff ff 4c 89 e7 e8 a7 97 ad ff e9 9f fd ff ff e8 0d 7b 5d ff 0f 0b e8 06 7b 5d ff 0f 0b e8 ff 7a 5d ff <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 55 41 57 41 56 41 54
RSP: 0018:ffffc9000e0176c0 EFLAGS: 00010293

RAX: ffffffff82234361 RBX: 000000d410000000 RCX: ffff88801a7e9dc0
RDX: 0000000000000000 RSI: 0000008000000000 RDI: 0000000000000000
RBP: ffffc9000e017a30 R08: dffffc0000000000 R09: ffffed100ad2550f
R10: ffffed100ad2550f R11: 1ffff1100ad2550e R12: 1ffff92001c02f84
R13: dffffc0000000000 R14: 0000008000000000 R15: ffff88805ddf6000
FS:  00007f29b9ba46c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f73cd2fe000 CR3: 000000002f536000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_writepages+0x3b7/0x610 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+0xc1/0x110 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+0x1ca/0x250 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+0xb1/0x140 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:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f29b8d8ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f29b9ba4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000021
RAX: 0000000000000004 RBX: 00007f29b8fb6090 RCX: 00007f29b8d8ebe9
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000006
RBP: 00007f29b8e11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f29b8fb6128 R14: 00007f29b8fb6090 R15: 00007ffceef73b68
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_writepages+0x2e41/0x2e50 fs/ext4/inode.c:2759
Code: c1 03 38 c1 0f 8c ac fd ff ff 4c 89 e7 e8 a7 97 ad ff e9 9f fd ff ff e8 0d 7b 5d ff 0f 0b e8 06 7b 5d ff 0f 0b e8 ff 7a 5d ff <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 55 41 57 41 56 41 54
RSP: 0018:ffffc9000e0176c0 EFLAGS: 00010293
RAX: ffffffff82234361 RBX: 000000d410000000 RCX: ffff88801a7e9dc0
RDX: 0000000000000000 RSI: 0000008000000000 RDI: 0000000000000000
RBP: ffffc9000e017a30 R08: dffffc0000000000 R09: ffffed100ad2550f
R10: ffffed100ad2550f R11: 1ffff1100ad2550e R12: 1ffff92001c02f84
R13: dffffc0000000000 R14: 0000008000000000 R15: ffff88805ddf6000
FS:  00007f29b9ba46c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f73d6da9f98 CR3: 000000002f536000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400