INFO: rcu_preempt self-detected stall on CPU 1-...: (1 GPs behind) idle=60e/140000000000002/0 softirq=12171/12173 fqs=0 (t=10500 jiffies g=1953 c=1952 q=605) rcu_preempt kthread starved for 10500 jiffies! g1953 c1952 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 rcu_preempt R running task 29920 8 2 0x80000000 Call Trace: schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_timeout+0x43c/0xe40 kernel/time/timer.c:1746 rcu_gp_kthread+0xb8e/0x1ce0 kernel/rcu/tree.c:2255 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 NMI backtrace for cpu 1 CPU: 1 PID: 7901 Comm: syz-executor.3 Not tainted 4.14.173-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+0x13e/0x194 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x139/0x17e lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:158 [inline] rcu_dump_cpu_stacks+0x16d/0x1b8 kernel/rcu/tree.c:1396 print_cpu_stall kernel/rcu/tree.c:1542 [inline] check_cpu_stall kernel/rcu/tree.c:1610 [inline] __rcu_pending kernel/rcu/tree.c:3390 [inline] rcu_pending kernel/rcu/tree.c:3452 [inline] rcu_check_callbacks.cold+0x490/0xdaa kernel/rcu/tree.c:2792 update_process_times+0x29/0x60 kernel/time/timer.c:1590 tick_sched_handle+0x7d/0x150 kernel/time/tick-sched.c:165 tick_sched_timer+0x3e/0x120 kernel/time/tick-sched.c:1223 __run_hrtimer kernel/time/hrtimer.c:1223 [inline] __hrtimer_run_queues+0x25c/0xbb0 kernel/time/hrtimer.c:1287 hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline] smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1100 apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:unwind_next_frame+0xec3/0x17a0 arch/x86/kernel/unwind_orc.c:474 RSP: 0018:ffff8880aeb071b8 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff10 RAX: ffffffff890d7885 RBX: ffff8880aeb07268 RCX: 0000000000000000 RDX: ffff8880aeb072a8 RSI: 0000000000000000 RDI: ffffffff890d7884 RBP: 1ffff11015d60e3e R08: 0000000000000004 R09: ffff8880aeb07750 R10: ffff8880aeb0729d R11: 0000000000058071 R12: ffffffff890d7882 R13: ffff8880aeb072a0 R14: ffff8880aeb07760 R15: 0000000000000002 __save_stack_trace+0x6b/0xd0 arch/x86/kernel/stacktrace.c:44 save_stack+0x32/0xa0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:529 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc mm/slab.c:3390 [inline] kmem_cache_alloc+0x114/0x770 mm/slab.c:3550 kmem_cache_zalloc include/linux/slab.h:651 [inline] fill_pool lib/debugobjects.c:110 [inline] __debug_object_init+0x5b7/0x830 lib/debugobjects.c:341 debug_object_init lib/debugobjects.c:393 [inline] debug_object_activate+0x274/0x450 lib/debugobjects.c:474 debug_rcu_head_queue kernel/rcu/rcu.h:152 [inline] __call_rcu.constprop.0+0x31/0x7e0 kernel/rcu/tree.c:3050 dst_release+0x56/0x80 net/core/dst.c:188 refdst_drop include/net/dst.h:286 [inline] skb_dst_drop include/net/dst.h:298 [inline] __dev_queue_xmit+0x17df/0x25c0 net/core/dev.c:3484 neigh_hh_output include/net/neighbour.h:490 [inline] neigh_output include/net/neighbour.h:498 [inline] ip6_finish_output2+0x1085/0x2150 net/ipv6/ip6_output.c:120 ip6_finish_output+0x4d9/0xaf0 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:239 [inline] ip6_output+0x1c9/0x650 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:462 [inline] NF_HOOK include/linux/netfilter.h:250 [inline] ndisc_send_skb+0xb56/0x11e0 net/ipv6/ndisc.c:483 ndisc_send_rs+0x125/0x630 net/ipv6/ndisc.c:677 addrconf_rs_timer+0x289/0x5a0 net/ipv6/addrconf.c:3757 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1279 expire_timers kernel/time/timer.c:1318 [inline] __run_timers kernel/time/timer.c:1636 [inline] __run_timers kernel/time/timer.c:1604 [inline] run_timer_softirq+0x52a/0x1390 kernel/time/timer.c:1649 __do_softirq+0x254/0x9bf kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x15b/0x1a0 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:rcu_is_watching+0x1/0xb0 kernel/rcu/tree.c:1126 RSP: 0018:ffff888051d1f670 EFLAGS: 00000212 ORIG_RAX: ffffffffffffff10 RAX: 0000000000040000 RBX: 1ffff1100a3a3ed1 RCX: ffffc90009222000 RDX: 000000000003b44a RSI: ffffffff85492a10 RDI: ffff888051d14ebc RBP: ffff88805c814180 R08: 0000000000000000 R09: 0000000000020012 R10: ffff888051d14f10 R11: ffff888051d14640 R12: ffff88808a1f3b28 R13: 0000607f51274720 R14: ffff888055970a80 R15: ffff88805a0a65c0 rcu_read_lock include/linux/rcupdate.h:630 [inline] nf_hook include/linux/netfilter.h:197 [inline] NF_HOOK_COND include/linux/netfilter.h:238 [inline] ip_output+0x425/0x520 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:462 [inline] ip_local_out+0x93/0x170 net/ipv4/ip_output.c:124 ip_queue_xmit+0x7b2/0x1b20 net/ipv4/ip_output.c:504 __tcp_transmit_skb+0x1654/0x2dd0 net/ipv4/tcp_output.c:1131 tcp_transmit_skb net/ipv4/tcp_output.c:1147 [inline] tcp_write_xmit+0x56a/0x4a60 net/ipv4/tcp_output.c:2391 tcp_sendmsg_locked+0x14da/0x2fd0 net/ipv4/tcp.c:1406 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1457 inet_sendmsg+0x116/0x4d0 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xc5/0x100 net/socket.c:656 sock_write_iter+0x22c/0x370 net/socket.c:925 call_write_iter include/linux/fs.h:1777 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x44e/0x630 fs/read_write.c:482 vfs_write+0x192/0x4e0 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xf2/0x210 fs/read_write.c:582 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c849 RSP: 002b:00007fe38998ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fe38998b6d4 RCX: 000000000045c849 RDX: 00000001000001bd RSI: 0000000020002300 RDI: 0000000000000004 RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000cdd R14: 00000000004cf031 R15: 000000000076bf0c libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error ceph: No mds server is up or the cluster is laggy libceph: mon1 [::6]:6789 socket closed (con state CONNECTING) libceph: mon1 [::6]:6789 socket closed (con state CONNECTING)