BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 1 PID: 18847 Comm: syz-executor.2 Not tainted 4.14.232-syzkaller #0
EXT4-fs warning (device sda1): ext4_resize_begin:72: There are errors in the filesystem, so online resizing is not allowed
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+0x1b2/0x281 lib/dump_stack.c:58
 add_chain_cache kernel/locking/lockdep.c:2303 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:2415 [inline]
 validate_chain kernel/locking/lockdep.c:2435 [inline]
 __lock_acquire.cold+0x19a/0x97c kernel/locking/lockdep.c:3491
 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x8c/0xc0 kernel/locking/spinlock.c:160
 debug_object_assert_init lib/debugobjects.c:638 [inline]
 debug_object_assert_init+0xdd/0x2d0 lib/debugobjects.c:627
 debug_timer_assert_init kernel/time/timer.c:708 [inline]
 debug_assert_init kernel/time/timer.c:756 [inline]
 try_to_del_timer_sync+0x5d/0xe0 kernel/time/timer.c:1176
 del_timer_sync+0x17c/0x240 kernel/time/timer.c:1246
 gsm_dlci_free+0x22/0x170 drivers/tty/n_gsm.c:1703
 tty_port_destructor drivers/tty/tty_port.c:263 [inline]
 kref_put include/linux/kref.h:70 [inline]
 tty_port_put+0x117/0x160 drivers/tty/tty_port.c:271
 dlci_put drivers/tty/n_gsm.c:1718 [inline]
 gsm_dlci_release drivers/tty/n_gsm.c:1746 [inline]
 gsm_cleanup_mux drivers/tty/n_gsm.c:2108 [inline]
 gsm_cleanup_mux+0x24d/0x3c0 drivers/tty/n_gsm.c:2079
 gsmld_detach_gsm drivers/tty/n_gsm.c:2304 [inline]
 gsmld_close+0xbb/0x1f0 drivers/tty/n_gsm.c:2372
 tty_ldisc_close+0x8c/0xc0 drivers/tty/tty_ldisc.c:505
 tty_ldisc_kill drivers/tty/tty_ldisc.c:651 [inline]
 tty_ldisc_release+0xe8/0x400 drivers/tty/tty_ldisc.c:818
 tty_release_struct+0x20/0xe0 drivers/tty/tty_io.c:1603
 tty_release+0xb3f/0x10d0 drivers/tty/tty_io.c:1776
 __fput+0x25f/0x7a0 fs/file_table.c:210
 task_work_run+0x11f/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x41940b
RSP: 002b:00007ffe7cae6ad0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 000000000041940b
RDX: ffffffffffffffbc RSI: 00000000089075c3 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b2d0278ec
R10: 0000000000000000 R11: 0000000000000293 R12: 000000000056c9e0
R13: 000000000056c9e0 R14: 000000000056bf60 R15: 00000000000fb424
EXT4-fs warning (device sda1): ext4_resize_begin:72: There are errors in the filesystem, so online resizing is not allowed
print_req_error: I/O error, dev loop5, sector 0
IPVS: ftp: loaded support on port[0] = 21
xt_connbytes: cannot load conntrack support for proto=2
xt_connbytes: Forcing CT accounting to be enabled