syzbot

wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50
wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50
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kernel BUG at fs/ext4/inode.c:2810!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 1 UID: 0 PID: 3895 Comm: kworker/u8:13 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: writeback wb_workfn (flush-7:1)
RIP: 0010:ext4_do_writepages+0x44fe/0x4500 fs/ext4/inode.c:2809
Code: c6 00 1b 7f 8b e8 b2 7a ad fe 90 0f 0b e8 6a 23 47 ff 4c 89 f7 48 c7 c6 e0 1e 7f 8b e8 9b 7a ad fe 90 0f 0b e8 53 23 47 ff 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6
RSP: 0018:ffffc9000d1f6ca0 EFLAGS: 00010293
RAX: ffffffff827a8d5d RBX: 0000006210000000 RCX: ffff888031bc5b80
RDX: 0000000000000000 RSI: 0000004000000000 RDI: 0000000000000000
RBP: ffffc9000d1f70b0 R08: ffff888055820057 R09: 1ffff1100ab0400a
R10: dffffc0000000000 R11: ffffed100ab0400b R12: dffffc0000000000
R13: 0000000000000001 R14: 0000004000000000 R15: 1ffff1100f8d80c7
FS:  0000000000000000(0000) GS:ffff888125f3a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1b0f957000 CR3: 00000000733ae000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 ext4_writepages+0x203/0x350 fs/ext4/inode.c:3026
 do_writepages+0x32e/0x550 mm/page-writeback.c:2598
 __writeback_single_inode+0x133/0x1240 fs/fs-writeback.c:1737
 writeback_sb_inodes+0x93a/0x1870 fs/fs-writeback.c:2030
 wb_writeback+0x42b/0xaa0 fs/fs-writeback.c:2216
 wb_do_writeback fs/fs-writeback.c:2363 [inline]
 wb_workfn+0x3f9/0xed0 fs/fs-writeback.c:2403
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_do_writepages+0x44fe/0x4500 fs/ext4/inode.c:2809
Code: c6 00 1b 7f 8b e8 b2 7a ad fe 90 0f 0b e8 6a 23 47 ff 4c 89 f7 48 c7 c6 e0 1e 7f 8b e8 9b 7a ad fe 90 0f 0b e8 53 23 47 ff 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6
RSP: 0018:ffffc9000d1f6ca0 EFLAGS: 00010293

RAX: ffffffff827a8d5d RBX: 0000006210000000 RCX: ffff888031bc5b80
RDX: 0000000000000000 RSI: 0000004000000000 RDI: 0000000000000000
RBP: ffffc9000d1f70b0 R08: ffff888055820057 R09: 1ffff1100ab0400a
R10: dffffc0000000000 R11: ffffed100ab0400b R12: dffffc0000000000
R13: 0000000000000001 R14: 0000004000000000 R15: 1ffff1100f8d80c7
FS:  0000000000000000(0000) GS:ffff888125f3a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1b0f957000 CR3: 0000000030d4d000 CR4: 0000000000350ef0