------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2809!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 3814 Comm: kworker/u9:5 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:ext4_do_writepages+0x4607/0x4610 fs/ext4/inode.c:2808
Code: c6 00 62 5e 8b e8 19 92 b5 fe 90 0f 0b e8 e1 c2 4b ff 4c 89 f7 48 c7 c6 e0 65 5e 8b e8 02 92 b5 fe 90 0f 0b e8 ca c2 4b ff 90 <0f> 0b 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900019decc0 EFLAGS: 00010293
RAX: ffffffff82725356 RBX: 0000004210000000 RCX: ffff8880214d5640
RDX: 0000000000000000 RSI: 0000004000000000 RDI: 0000000000000000
RBP: ffffc900019df0f0 R08: ffff888119a30057 R09: 1ffff1102334600a
R10: dffffc0000000000 R11: ffffed102334600b R12: 0000000000000001
R13: ffffc900019df140 R14: 0000004000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b8d7e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055558f1b15c8 CR3: 00000000267c6000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 ext4_writepages+0x205/0x350 fs/ext4/inode.c:3025
 do_writepages+0x32e/0x550 mm/page-writeback.c:2634
 __writeback_single_inode+0x145/0xff0 fs/fs-writeback.c:1719
 writeback_sb_inodes+0x6c7/0x1010 fs/fs-writeback.c:2015
 wb_writeback+0x43b/0xaf0 fs/fs-writeback.c:2195
 wb_do_writeback fs/fs-writeback.c:2342 [inline]
 wb_workfn+0x409/0xef0 fs/fs-writeback.c:2382
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x439/0x7d0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_do_writepages+0x4607/0x4610 fs/ext4/inode.c:2808
Code: c6 00 62 5e 8b e8 19 92 b5 fe 90 0f 0b e8 e1 c2 4b ff 4c 89 f7 48 c7 c6 e0 65 5e 8b e8 02 92 b5 fe 90 0f 0b e8 ca c2 4b ff 90 <0f> 0b 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900019decc0 EFLAGS: 00010293
RAX: ffffffff82725356 RBX: 0000004210000000 RCX: ffff8880214d5640
RDX: 0000000000000000 RSI: 0000004000000000 RDI: 0000000000000000
RBP: ffffc900019df0f0 R08: ffff888119a30057 R09: 1ffff1102334600a
R10: dffffc0000000000 R11: ffffed102334600b R12: 0000000000000001
R13: ffffc900019df140 R14: 0000004000000000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881a417e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2d23573420 CR3: 00000000267de000 CR4: 00000000000006f0
