[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.633192] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.987691] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 23.399062] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 24.135241] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) [ 28.078894] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) Warning: Permanently added '10.128.0.9' (ECDSA) to the list of known hosts. [ 33.751349] random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 57.051167] random: nonblocking pool is initialized executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 85.147779] ================================================================== [ 85.155163] BUG: KASAN: use-after-free in l2tp_session_queue_purge+0xf4/0x100 [ 85.162422] Read of size 4 at addr ffff8801cc742500 by task syz-executor140/13902 [ 85.170013] [ 85.171617] CPU: 0 PID: 13902 Comm: syz-executor140 Not tainted 4.4.147-ga5fc665 #16 [ 85.179467] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 85.188803] 0000000000000000 d5266a9a559b3533 ffff8800aeb4fc78 ffffffff81e12a4d [ 85.196800] ffffea000731d080 ffff8801cc742500 0000000000000000 ffff8801cc742500 [ 85.204775] ffffffff82f1f9a0 ffff8800aeb4fcb0 ffffffff81517fd6 ffff8801cc742500 [ 85.212751] Call Trace: [ 85.215382] [] dump_stack+0xc1/0x124 [ 85.220736] [] ? sock_release+0x1c0/0x1c0 [ 85.226526] [] print_address_description+0x6c/0x216 [ 85.233176] [] ? sock_release+0x1c0/0x1c0 [ 85.238956] [] kasan_report.cold.7+0x175/0x2f7 [ 85.245163] [] ? l2tp_session_queue_purge+0xf4/0x100 [ 85.251960] [] __asan_report_load4_noabort+0x14/0x20 [ 85.258694] [] l2tp_session_queue_purge+0xf4/0x100 [ 85.265268] [] ? sock_release+0x1c0/0x1c0 [ 85.271046] [] pppol2tp_release+0x1ff/0x310 [ 85.276996] [] sock_release+0x96/0x1c0 [ 85.282505] [] sock_close+0x16/0x20 [ 85.287756] [] __fput+0x235/0x6f0 [ 85.292833] [] ____fput+0x15/0x20 [ 85.297942] [] task_work_run+0x10f/0x190 [ 85.303625] [] exit_to_usermode_loop+0x13d/0x160 [ 85.310006] [] do_fast_syscall_32+0x61e/0x8b0 [ 85.316124] [] sysenter_flags_fixed+0xd/0x1a [ 85.322163] [ 85.323763] Allocated by task 13903: [ 85.327453] [] save_stack_trace+0x26/0x50 [ 85.333346] [] save_stack+0x43/0xd0 [ 85.338737] [] kasan_kmalloc+0xc7/0xe0 [ 85.344431] [] __kmalloc+0x124/0x310 [ 85.349890] [] l2tp_session_create+0x39/0x1030 [ 85.356333] [] pppol2tp_connect+0x10f0/0x1910 [ 85.362586] [] SYSC_connect+0x1b8/0x300 [ 85.368573] [] SyS_connect+0x24/0x30 [ 85.374033] [] do_fast_syscall_32+0x324/0x8b0 [ 85.380265] [] sysenter_flags_fixed+0xd/0x1a [ 85.386413] [ 85.388034] Freed by task 13865: [ 85.391367] [] save_stack_trace+0x26/0x50 [ 85.397256] [] save_stack+0x43/0xd0 [ 85.402660] [] kasan_slab_free+0x72/0xc0 [ 85.408471] [] kfree+0xf4/0x310 [ 85.413498] [] l2tp_session_free+0x170/0x200 [ 85.419654] [] l2tp_tunnel_closeall+0x2b9/0x350 [ 85.426074] [] l2tp_udp_encap_destroy+0x8b/0xf0 [ 85.432514] [] udpv6_destroy_sock+0xb1/0xd0 [ 85.438575] [] sk_common_release+0x6d/0x300 [ 85.444661] [] udp_lib_close+0x15/0x20 [ 85.450300] [] inet_release+0xff/0x1d0 [ 85.455929] [] inet6_release+0x50/0x70 [ 85.461558] [] sock_release+0x96/0x1c0 [ 85.467188] [] sock_close+0x16/0x20 [ 85.472584] [] __fput+0x235/0x6f0 [ 85.477878] [] ____fput+0x15/0x20 [ 85.483194] [] task_work_run+0x10f/0x190 [ 85.489007] [] do_exit+0x9e5/0x26b0 [ 85.494380] [] do_group_exit+0x111/0x330 [ 85.500186] [] get_signal+0x4ec/0x14b0 [ 85.505817] [] do_signal+0x8b/0x1d30 [ 85.511289] [] exit_to_usermode_loop+0x11a/0x160 [ 85.517788] [] prepare_exit_to_usermode+0xe3/0x100 [ 85.524545] [] retint_user+0x8/0x3c [ 85.529925] [ 85.531530] The buggy address belongs to the object at ffff8801cc742500 [ 85.531530] which belongs to the cache kmalloc-512 of size 512 [ 85.544159] The buggy address is located 0 bytes inside of [ 85.544159] 512-byte region [ffff8801cc742500, ffff8801cc742700) [ 85.555831] The buggy address belongs to the page: [ 85.561242] kasan: CONFIG_KASAN_INLINE enabled [ 85.565677] kasan: GPF could be caused by NULL-ptr deref or user memory accesskasan: CONFIG_KASAN_INLINE enabled [ 85.573249] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 85.573250] ------------[ cut here ]------------ [ 85.573275] WARNING: CPU: 1 PID: -2085966496 at kernel/rcu/update.c:211 __rcu_read_unlock+0x140/0x1a0() [ 85.573278] Kernel panic - not syncing: panic_on_warn set ... [ 85.573278] [ 85.573283] CPU: 1 PID: -2085966496 Comm: Not tainted 4.4.147-ga5fc665 #16 [ 85.573286] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 85.573296] 0000000000000000 4d5c9f70f60781d4 ffff8801db307930 ffffffff81e12a4d [ 85.573300] ffffffff83a44d40 ffff8800ae529800 ffffffff83a67000 0000000000000009 [ 85.573305] 00000000000000d3 ffff8801db3079f0 ffffffff8140c6a4 0000000041b58ab3 [ 85.573307] Call Trace: [ 85.573317] [] dump_stack+0xc1/0x124 [ 85.573323] [] panic+0x19e/0x38d [ 85.573327] [] ? add_taint.cold.4+0x16/0x16 [ 85.573333] [] ? check_preemption_disabled+0x3b/0x170 [ 85.573337] [] ? warn_slowpath_common.cold.6+0x5/0x20 [ 85.573342] [] warn_slowpath_common.cold.6+0x20/0x20 [ 85.573345] [] ? __rcu_read_unlock+0x140/0x1a0 [ 85.573366] [] warn_slowpath_null+0x29/0x30 [ 85.573369] [] __rcu_read_unlock+0x140/0x1a0 [ 85.573389] [] atomic_notifier_call_chain+0xa2/0x140 [ 85.573393] [] ? blocking_notifier_call_chain+0xa0/0xa0 [ 85.573397] [] notify_die+0xdf/0x160 [ 85.573402] [] ? atomic_notifier_call_chain+0x140/0x140 [ 85.573408] [] ? cpuacct_account_field+0xad/0x2f0 [ 85.573413] [] ? search_exception_tables+0x31/0x40 [ 85.573419] [] do_general_protection+0x20a/0x2b0 [ 85.573427] [] general_protection+0x28/0x30 [ 85.573431] [] ? cpuacct_account_field+0xad/0x2f0 [ 85.573435] [] ? cpuacct_charge+0x380/0x380 [ 85.573440] [] account_system_time+0x1a6/0x4c0 [ 85.573444] [] account_process_tick+0xdc/0x310 [ 85.573450] [] ? kvm_clock_read+0x23/0x40 [ 85.573455] [] update_process_times+0x23/0x70 [ 85.573461] [] tick_sched_handle.isra.15+0x55/0xf0 [ 85.573464] [] tick_sched_timer+0x72/0x120 [ 85.573468] [] ? tick_sched_do_timer+0xa0/0xa0 [ 85.573472] [] __hrtimer_run_queues+0x3ad/0x1000 [ 85.573476] [] ? retrigger_next_event+0x1c0/0x1c0 [ 85.573480] [] ? kvm_clock_read+0x23/0x40 [ 85.573484] [] ? kvm_clock_get_cycles+0x9/0x10 [ 85.573487] [] ? hrtimer_interrupt+0x12d/0x430 [ 85.573491] [] hrtimer_interrupt+0x1b1/0x430 [ 85.573496] [] local_apic_timer_interrupt+0x74/0xa0 [ 85.573501] [] smp_apic_timer_interrupt+0x7c/0xa0 [ 85.573504] [] apic_timer_interrupt+0xa0/0xb0 [ 86.716155] [ 86.716156] Shutting down cpus with NMI [ 86.716417] Dumping ftrace buffer: [ 86.716419] (ftrace buffer empty) [ 86.716421] Kernel Offset: disabled [ 86.716423] ------------[ cut here ]------------ [ 86.716439] WARNING: CPU: 1 PID: -2085966496 at kernel/rcu/update.c:211 __rcu_read_unlock+0x140/0x1a0() [ 86.716442] Modules linked in: [ 86.716447] CPU: 1 PID: -2085966496 Comm: Not tainted 4.4.147-ga5fc665 #16 [ 86.716449] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 86.716456] 0000000000000000 4d5c9f70f60781d4 ffff8801db307880 ffffffff81e12a4d [ 86.716460] 0000000000000000 ffff8800ae529800 ffffffff83a67000 0000000000000009 [ 86.716465] 00000000000000d3 ffff8801db3078c0 ffffffff811320ed ffffffff81279b70 [ 86.716467] Call Trace: [ 86.716477] [] dump_stack+0xc1/0x124 [ 86.716484] [] warn_slowpath_common+0xdd/0x120 [ 86.716488] [] ? __rcu_read_unlock+0x140/0x1a0 [ 86.716492] [] warn_slowpath_null+0x29/0x30 [ 86.716496] [] __rcu_read_unlock+0x140/0x1a0 [ 86.716503] [] atomic_notifier_call_chain+0xa2/0x140 [ 86.716507] [] ? blocking_notifier_call_chain+0xa0/0xa0 [ 86.716513] [] panic+0x202/0x38d [ 86.716517] [] ? add_taint.cold.4+0x16/0x16 [ 86.716524] [] ? check_preemption_disabled+0x3b/0x170 [ 86.716528] [] ? warn_slowpath_common.cold.6+0x5/0x20 [ 86.716532] [] warn_slowpath_common.cold.6+0x20/0x20 [ 86.716535] [] ? __rcu_read_unlock+0x140/0x1a0 [ 86.716539] [] warn_slowpath_null+0x29/0x30 [ 86.716543] [] __rcu_read_unlock+0x140/0x1a0 [ 86.716547] [] atomic_notifier_call_chain+0xa2/0x140 [ 86.716552] [] ? blocking_notifier_call_chain+0xa0/0xa0 [ 86.716556] [] notify_die+0xdf/0x160 [ 86.716561] [] ? atomic_notifier_call_chain+0x140/0x140 [ 86.716567] [] ? cpuacct_account_field+0xad/0x2f0 [ 86.716572] [] ? search_exception_tables+0x31/0x40 [ 86.716578] [] do_general_protection+0x20a/0x2b0 [ 86.716584] [] general_protection+0x28/0x30 [ 86.716588] [] ? cpuacct_account_field+0xad/0x2f0 [ 86.716592] [] ? cpuacct_charge+0x380/0x380 [ 86.716597] [] account_system_time+0x1a6/0x4c0 [ 86.716602] [] account_process_tick+0xdc/0x310 [ 86.716609] [] ? kvm_clock_read+0x23/0x40 [ 86.716614] [] update_process_times+0x23/0x70 [ 86.716620] [] tick_sched_handle.isra.15+0x55/0xf0 [ 86.716624] [] tick_sched_timer+0x72/0x120 [ 86.716628] [] ? tick_sched_do_timer+0xa0/0xa0 [ 86.716632] [] __hrtimer_run_queues+0x3ad/0x1000 [ 86.716636] [] ? retrigger_next_event+0x1c0/0x1c0 [ 86.716640] [] ? kvm_clock_read+0x23/0x40 [ 86.716644] [] ? kvm_clock_get_cycles+0x9/0x10 [ 86.716648] [] ? hrtimer_interrupt+0x12d/0x430 [ 86.716652] [] hrtimer_interrupt+0x1b1/0x430 [ 86.716658] [] local_apic_timer_interrupt+0x74/0xa0 [ 86.716663] [] smp_apic_timer_interrupt+0x7c/0xa0 [ 86.716666] [] apic_timer_interrupt+0xa0/0xb0 [ 86.716669] [ 86.716670] ---[ end trace 5d69e692c9c40e7c ]--- [ 87.356015] Rebooting in 86400 seconds..