------------[ cut here ]------------ kernel BUG at fs/ext4/inode.c:2805! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 2952 Comm: kworker/u4:13 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+0x45b0/0x45c0 fs/ext4/inode.c:2804 Code: c6 80 1c 7f 8b e8 e0 55 ad fe 90 0f 0b e8 c8 ad 46 ff 4c 89 f7 48 c7 c6 60 20 7f 8b e8 c9 55 ad fe 90 0f 0b e8 b1 ad 46 ff 90 <0f> 0b 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 RSP: 0018:ffffc9000d436c00 EFLAGS: 00010293 RAX: ffffffff827aac4f RBX: 0000004210000000 RCX: ffff888031e5c980 RDX: 0000000000000000 RSI: 0000004000000000 RDI: 0000000000000000 RBP: ffffc9000d437030 R08: ffff8880437009e7 R09: 1ffff110086e013c R10: dffffc0000000000 R11: ffffed10086e013d R12: 0000000000000001 R13: ffffc9000d437080 R14: 0000004000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88808d69f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa5a2ba8ad8 CR3: 0000000011e47000 CR4: 0000000000352ef0 Call Trace: ext4_writepages+0x205/0x350 fs/ext4/inode.c:3021 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 ]---