------------[ cut here ]------------ kernel BUG at fs/ext4/inode.c:2810! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 4604 Comm: kworker/u4:24 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: writeback wb_workfn (flush-7:0) RIP: 0010:ext4_do_writepages+0x44fe/0x4500 fs/ext4/inode.c:2809 Code: c6 c0 2c 9f 8b e8 52 e0 ab fe 90 0f 0b e8 3a 98 45 ff 4c 89 f7 48 c7 c6 a0 30 9f 8b e8 3b e0 ab fe 90 0f 0b e8 23 98 45 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:ffffc90002c1ec20 EFLAGS: 00010293 RAX: ffffffff827c282d RBX: 0000004210000000 RCX: ffff888031ad4980 RDX: 0000000000000000 RSI: 0000004000000000 RDI: 0000000000000000 RBP: ffffc90002c1f030 R08: ffff8880126489f7 R09: 1ffff110024c913e R10: dffffc0000000000 R11: ffffed10024c913f R12: dffffc0000000000 R13: 0000000000000001 R14: 0000004000000000 R15: 1ffff11006ebf0c7 FS: 0000000000000000(0000) GS:ffff88808d22f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7a91152000 CR3: 0000000037213000 CR4: 0000000000352ef0 Call Trace: 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 __writeback_inodes_wb+0x111/0x240 fs/fs-writeback.c:2107 wb_writeback+0x43f/0xaa0 fs/fs-writeback.c:2218 wb_check_start_all fs/fs-writeback.c:2344 [inline] wb_do_writeback fs/fs-writeback.c:2370 [inline] wb_workfn+0x8ee/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 Modules linked in: ---[ end trace 0000000000000000 ]---