IPVS: ftp: loaded support on port[0] = 21
NILFS (loop0): broken superblock, retrying with spare superblock (blocksize = 1024)
NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds
------------[ cut here ]------------
WARNING: CPU: 1 PID: 8034 at include/linux/backing-dev.h:334 inode_to_wb include/linux/backing-dev.h:334 [inline]
WARNING: CPU: 1 PID: 8034 at include/linux/backing-dev.h:334 account_page_dirtied+0x7c7/0xa20 mm/page-writeback.c:2437
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 8034 Comm: segctord Not tainted 4.14.204-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 panic+0x1f9/0x42d kernel/panic.c:183
 __warn.cold+0x20/0x4b kernel/panic.c:547
 report_bug+0x208/0x249 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964
RIP: 0010:inode_to_wb include/linux/backing-dev.h:334 [inline]
RIP: 0010:account_page_dirtied+0x7c7/0xa20 mm/page-writeback.c:2437
RSP: 0018:ffff8880b35d7908 EFLAGS: 00010097
RAX: ffff8880b2b0c300 RBX: ffff8880af390340 RCX: 1ffffffff1279f18
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000082
RBP: ffff88808df7eb58 R08: ffffffff8ba4519c R09: 0000000000001d6e
R10: 0000000000000001 R11: ffff8880b2b0c300 R12: ffffea0002aa8700
R13: ffff88808df7e9c8 R14: ffff88808df7e9c8 R15: ffffea0002aa8720
 __set_page_dirty+0x77/0x2a0 fs/buffer.c:634
 mark_buffer_dirty+0x307/0x480 fs/buffer.c:1173
 nilfs_btree_propagate_p fs/nilfs2/btree.c:1899 [inline]
 nilfs_btree_propagate+0x3a3/0xc20 fs/nilfs2/btree.c:2095
 nilfs_bmap_propagate+0x73/0x160 fs/nilfs2/bmap.c:346
 nilfs_collect_dat_data+0x41/0xb0 fs/nilfs2/segment.c:639
 nilfs_segctor_apply_buffers+0x191/0x450 fs/nilfs2/segment.c:1027
 nilfs_segctor_scan_file+0x366/0x630 fs/nilfs2/segment.c:1076
 nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1238 [inline]
 nilfs_segctor_collect fs/nilfs2/segment.c:1507 [inline]
 nilfs_segctor_do_construct+0x1426/0x7910 fs/nilfs2/segment.c:2049
 nilfs_segctor_construct+0x6db/0x8e0 fs/nilfs2/segment.c:2385
 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2493 [inline]
 nilfs_segctor_thread+0x3ad/0xdb0 fs/nilfs2/segment.c:2577
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Kernel Offset: disabled
Rebooting in 86400 seconds..