syzbot

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kernel BUG at fs/ext4/inode.c:2605!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 11 Comm: kworker/u4:0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: writeback wb_workfn (flush-7:2)
RIP: 0010:ext4_do_writepages+0x398e/0x3990 fs/ext4/inode.c:2604
Code: c1 03 38 c1 0f 8c 7d fd ff ff 4c 89 e7 e8 0a a2 ab ff e9 70 fd ff ff e8 f0 6a 53 ff 0f 0b e8 e9 6a 53 ff 0f 0b e8 e2 6a 53 ff <0f> 0b 66 0f 1f 00 55 41 57 41 56 41 54 53 48 89 fb 49 bf 00 00 00
RSP: 0018:ffffc90000106e80 EFLAGS: 00010293
RAX: ffffffff8233b71e RBX: 0000006210000000 RCX: ffff88801a273c00
RDX: 0000000000000000 RSI: 0000004000000000 RDI: 0000000000000000
RBP: ffffc900001071f0 R08: ffff88806c2a2857 R09: 1ffff1100d85450a
R10: dffffc0000000000 R11: ffffed100d85450b R12: 0000000000000001
R13: ffff88806c2a2ab0 R14: 0000004000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0a59c9b368 CR3: 0000000072262000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 ext4_writepages+0x1dd/0x350 fs/ext4/inode.c:2809
 do_writepages+0x3b3/0x630 mm/page-writeback.c:2575
 __writeback_single_inode+0x153/0xec0 fs/fs-writeback.c:1635
 writeback_sb_inodes+0x7cd/0xf50 fs/fs-writeback.c:1926
 wb_writeback+0x46a/0xbf0 fs/fs-writeback.c:2105
 wb_do_writeback fs/fs-writeback.c:2252 [inline]
 wb_workfn+0x400/0xe60 fs/fs-writeback.c:2292
 process_one_work kernel/workqueue.c:2653 [inline]
 process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_do_writepages+0x398e/0x3990 fs/ext4/inode.c:2604
Code: c1 03 38 c1 0f 8c 7d fd ff ff 4c 89 e7 e8 0a a2 ab ff e9 70 fd ff ff e8 f0 6a 53 ff 0f 0b e8 e9 6a 53 ff 0f 0b e8 e2 6a 53 ff <0f> 0b 66 0f 1f 00 55 41 57 41 56 41 54 53 48 89 fb 49 bf 00 00 00
RSP: 0018:ffffc90000106e80 EFLAGS: 00010293
RAX: ffffffff8233b71e RBX: 0000006210000000 RCX: ffff88801a273c00
RDX: 0000000000000000 RSI: 0000004000000000 RDI: 0000000000000000
RBP: ffffc900001071f0 R08: ffff88806c2a2857 R09: 1ffff1100d85450a
R10: dffffc0000000000 R11: ffffed100d85450b R12: 0000000000000001
R13: ffff88806c2a2ab0 R14: 0000004000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005578640cfbe0 CR3: 0000000072262000 CR4: 00000000003506f0