syzbot


general protection fault in timerqueue_add (2)

Status: closed as dup on 2019/01/04 16:41
Reported-by: syzbot+0bdf4106024c4d67538b@syzkaller.appspotmail.com
First crash: 1606d, last: 1603d
Duplicate of
Title Repro Cause bisect Fix bisect Count Last Reported
kernel panic: stack is corrupted in udp4_lib_lookup2 net 11 1609d 1606d
Discussions (1)
Title Replies (including bot) Last reply
general protection fault in timerqueue_add (2) 1 (2) 2019/01/04 16:41
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in timerqueue_add (4) reiserfs C error 2 22d 91d 0/24 upstream: reported C repro on 2023/02/26 03:51
upstream general protection fault in timerqueue_add (3) 1 1370d 1370d 0/24 auto-closed as invalid on 2019/11/25 13:35
upstream general protection fault in timerqueue_add kernel C 2 1888d 1888d 6/24 fixed on 2018/04/06 16:37

Sample crash report:
kasan: CONFIG_KASAN_INLINE enabled
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 12722 Comm: syz-executor4 Not tainted 4.20.0+ #12
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:timerqueue_add+0xf2/0x320 lib/timerqueue.c:52
Code: 48 c1 ea 03 42 80 3c 2a 00 0f 85 bc 01 00 00 49 8b 17 48 85 d2 74 3d 48 89 d3 e8 c9 ee 92 f9 48 8d 7b 18 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 a3 01 00 00 4c 8b 7b 18 4c 89 f7 4c 89 fe e8
RSP: 0018:ffff8880ae707b68 EFLAGS: 00010007
RAX: 0000000000001022 RBX: 00000000000080fe RCX: ffffffff87ef09ec
RDX: 0000000000010000 RSI: ffffffff87ef09c7 RDI: 0000000000008116
RBP: ffff8880ae707b98 R08: ffff8880a7dc4700 R09: ffffed1015ce5b90
R10: ffffed1015ce5b8f R11: ffff8880ae72dc7b R12: ffff888083075018
R13: dffffc0000000000 R14: 000000300e95abab R15: ffff88808d0165d0
FS:  00007fdc9dd8c700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020008378 CR3: 000000008988d000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 enqueue_hrtimer+0x1ae/0x570 kernel/time/hrtimer.c:951
 __run_hrtimer kernel/time/hrtimer.c:1404 [inline]
 __hrtimer_run_queues+0xc39/0x1050 kernel/time/hrtimer.c:1451
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline]
 smp_apic_timer_interrupt+0x18d/0x760 arch/x86/kernel/apic/apic.c:1060
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
 </IRQ>
RIP: 0010:update_stack_state+0x502/0x680 arch/x86/kernel/unwind_frame.c:261
Code: ff 48 b8 00 00 00 00 00 fc ff df 41 c6 04 04 f8 e9 6c fe ff ff 49 8d 7f 38 48 b8 00 00 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 <80> 3c 01 00 0f 85 26 01 00 00 48 8b 85 50 ff ff ff 49 c7 47 50 00
RSP: 0018:ffff8880a1196810 EFLAGS: 00000a06 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: ffff8880a1197e30 RCX: 1ffff11014232d47
RDX: ffff8880a1190000 RSI: 1ffff11014232d00 RDI: ffff8880a1196a38
RBP: ffff8880a11968f8 R08: 0000000000000001 R09: ffff8880a1196a50
R10: ffff8880a1196a28 R11: ffff8880a1196a38 R12: ffff8880a11969f0
R13: dffffc0000000000 R14: ffff8880a1196a40 R15: ffff8880a1196a00
 unwind_next_frame.part.0+0x1ae/0xa90 arch/x86/kernel/unwind_frame.c:329
 unwind_next_frame+0x3b/0x50 arch/x86/kernel/unwind_frame.c:287
 __save_stack_trace+0x7a/0xf0 arch/x86/kernel/stacktrace.c:44
 save_stack_trace+0x1a/0x20 arch/x86/kernel/stacktrace.c:60
 save_stack+0x45/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 kasan_kmalloc mm/kasan/common.c:482 [inline]
 kasan_kmalloc+0xcf/0xe0 mm/kasan/common.c:455
 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:397
 kmem_cache_alloc_node+0x144/0x710 mm/slab.c:3631
 __alloc_skb+0xf4/0x730 net/core/skbuff.c:196
 alloc_skb include/linux/skbuff.h:1011 [inline]
 alloc_skb_with_frags+0x13a/0x770 net/core/skbuff.c:5288
 sock_alloc_send_pskb+0x8c9/0xad0 net/core/sock.c:2091
 sock_alloc_send_skb+0x32/0x40 net/core/sock.c:2108
 __ip6_append_data.isra.0+0x2556/0x3f20 net/ipv6/ip6_output.c:1443
 ip6_make_skb+0x391/0x5f0 net/ipv6/ip6_output.c:1806
 udpv6_sendmsg+0x2b58/0x3550 net/ipv6/udp.c:1460
 inet_sendmsg+0x1af/0x740 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg+0xdd/0x130 net/socket.c:631
 ___sys_sendmsg+0x409/0x910 net/socket.c:2116
 __sys_sendmmsg+0x246/0x730 net/socket.c:2211
 __do_sys_sendmmsg net/socket.c:2240 [inline]
 __se_sys_sendmmsg net/socket.c:2237 [inline]
 __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2237
 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457ec9
Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fdc9dd8bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457ec9
RDX: 08000000000000fc RSI: 0000000020005fc0 RDI: 0000000000000003
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000008000000 R11: 0000000000000246 R12: 00007fdc9dd8c6d4
R13: 00000000004c4ce5 R14: 00000000004d85d8 R15: 00000000ffffffff
Modules linked in:

======================================================
WARNING: possible circular locking dependency detected
4.20.0+ #12 Not tainted
------------------------------------------------------
syz-executor4/12722 is trying to acquire lock:
00000000bccce462 ((console_sem).lock){-.-.}, at: down_trylock+0x13/0x70 kernel/locking/semaphore.c:136

but task is already holding lock:
000000004834bd23 (hrtimer_bases.lock){-.-.}, at: __run_hrtimer kernel/time/hrtimer.c:1391 [inline]
000000004834bd23 (hrtimer_bases.lock){-.-.}, at: __hrtimer_run_queues+0x40f/0x1050 kernel/time/hrtimer.c:1451

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #4 (hrtimer_bases.lock){-.-.}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
       lock_hrtimer_base.isra.0+0x75/0x130 kernel/time/hrtimer.c:165
       hrtimer_start_range_ns+0x120/0xda0 kernel/time/hrtimer.c:1104
       hrtimer_start_expires include/linux/hrtimer.h:409 [inline]
       start_rt_bandwidth kernel/sched/rt.c:70 [inline]
       inc_rt_group kernel/sched/rt.c:1147 [inline]
       inc_rt_tasks kernel/sched/rt.c:1191 [inline]
       __enqueue_rt_entity kernel/sched/rt.c:1261 [inline]
       enqueue_rt_entity kernel/sched/rt.c:1305 [inline]
       enqueue_task_rt+0x95b/0x1010 kernel/sched/rt.c:1335
       enqueue_task+0xb9/0x380 kernel/sched/core.c:730
       __sched_setscheduler+0xe32/0x1fe0 kernel/sched/core.c:4336
       _sched_setscheduler+0x218/0x340 kernel/sched/core.c:4373
       sched_setscheduler+0xe/0x10 kernel/sched/core.c:4388
       watchdog_dev_init+0x109/0x1db drivers/watchdog/watchdog_dev.c:1144
       watchdog_init+0x81/0x294 drivers/watchdog/watchdog_core.c:355
       do_one_initcall+0x129/0x937 init/main.c:888
       do_initcall_level init/main.c:956 [inline]
       do_initcalls init/main.c:964 [inline]
       do_basic_setup init/main.c:982 [inline]
       kernel_init_freeable+0x4db/0x5ca init/main.c:1135
       kernel_init+0x12/0x1c5 init/main.c:1055
       ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

-> #3 (&rt_b->rt_runtime_lock){-.-.}:
       __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
       _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
       __enable_runtime kernel/sched/rt.c:786 [inline]
       rq_online_rt+0xb4/0x390 kernel/sched/rt.c:2178
       set_rq_online.part.0+0xe7/0x140 kernel/sched/core.c:5666
       set_rq_online kernel/sched/core.c:5772 [inline]
       sched_cpu_activate+0x29e/0x430 kernel/sched/core.c:5765
       cpuhp_invoke_callback+0x2f6/0x2110 kernel/cpu.c:168
       cpuhp_thread_fun+0x496/0x8a0 kernel/cpu.c:685
       smpboot_thread_fn+0x6ab/0xa10 kernel/smpboot.c:164
       kthread+0x357/0x430 kernel/kthread.c:246
       ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

-> #2 (&rq->lock){-.-.}:
       __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
       _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
       rq_lock kernel/sched/sched.h:1149 [inline]
       task_fork_fair+0xb5/0x7a0 kernel/sched/fair.c:10058
       sched_fork+0x437/0xb90 kernel/sched/core.c:2359
       copy_process+0x1ff6/0x8730 kernel/fork.c:1888
       _do_fork+0x1a9/0x1170 kernel/fork.c:2217
       kernel_thread+0x34/0x40 kernel/fork.c:2276
       rest_init+0x28/0x37b init/main.c:408
       arch_call_rest_init+0xe/0x1b
       start_kernel+0x882/0x8bd init/main.c:740
       x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:470
       x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:451
       secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243

-> #1 (&p->pi_lock){-.-.}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
       try_to_wake_up+0xb9/0x1480 kernel/sched/core.c:1965
       wake_up_process+0x10/0x20 kernel/sched/core.c:2129
       __up.isra.0+0x1c0/0x2a0 kernel/locking/semaphore.c:262
       up+0x13e/0x1c0 kernel/locking/semaphore.c:187
       __up_console_sem+0xb7/0x1c0 kernel/printk/printk.c:236
       console_unlock+0x778/0x11e0 kernel/printk/printk.c:2426
       vprintk_emit+0x370/0x960 kernel/printk/printk.c:1931
       vprintk_default+0x28/0x30 kernel/printk/printk.c:1958
       vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398
       printk+0xba/0xed kernel/printk/printk.c:1991
       kauditd_printk_skb kernel/audit.c:545 [inline]
       kauditd_hold_skb.cold+0x3f/0x4e kernel/audit.c:578
       kauditd_send_queue+0x133/0x170 kernel/audit.c:741
       kauditd_thread+0x808/0xb80 kernel/audit.c:867
       kthread+0x357/0x430 kernel/kthread.c:246
       ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352

-> #0 ((console_sem).lock){-.-.}:
       lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
       down_trylock+0x13/0x70 kernel/locking/semaphore.c:136
       __down_trylock_console_sem+0xa8/0x210 kernel/printk/printk.c:219
       console_trylock+0x15/0xa0 kernel/printk/printk.c:2242
       console_trylock_spinning kernel/printk/printk.c:1662 [inline]
       vprintk_emit+0x351/0x960 kernel/printk/printk.c:1930
       vprintk_default+0x28/0x30 kernel/printk/printk.c:1958
       vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398
       printk+0xba/0xed kernel/printk/printk.c:1991
       kasan_die_handler arch/x86/mm/kasan_init_64.c:252 [inline]
       kasan_die_handler.cold+0x11/0x23 arch/x86/mm/kasan_init_64.c:247
       notifier_call_chain+0x179/0x380 kernel/notifier.c:93
       __atomic_notifier_call_chain kernel/notifier.c:183 [inline]
       atomic_notifier_call_chain+0x96/0x190 kernel/notifier.c:193
       notify_die+0x1b2/0x270 kernel/notifier.c:549
       do_general_protection+0x13d/0x300 arch/x86/kernel/traps.c:557
       general_protection+0x1e/0x30 arch/x86/entry/entry_64.S:1142
       timerqueue_add+0xf2/0x320 lib/timerqueue.c:52
       enqueue_hrtimer+0x1ae/0x570 kernel/time/hrtimer.c:951
       __run_hrtimer kernel/time/hrtimer.c:1404 [inline]
       __hrtimer_run_queues+0xc39/0x1050 kernel/time/hrtimer.c:1451
       hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
       local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline]
       smp_apic_timer_interrupt+0x18d/0x760 arch/x86/kernel/apic/apic.c:1060
       apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
       update_stack_state+0x502/0x680 arch/x86/kernel/unwind_frame.c:261
       unwind_next_frame.part.0+0x1ae/0xa90 arch/x86/kernel/unwind_frame.c:329
       unwind_next_frame+0x3b/0x50 arch/x86/kernel/unwind_frame.c:287
       __save_stack_trace+0x7a/0xf0 arch/x86/kernel/stacktrace.c:44
       save_stack_trace+0x1a/0x20 arch/x86/kernel/stacktrace.c:60
       save_stack+0x45/0xd0 mm/kasan/common.c:73
       set_track mm/kasan/common.c:85 [inline]
       kasan_kmalloc mm/kasan/common.c:482 [inline]
       kasan_kmalloc+0xcf/0xe0 mm/kasan/common.c:455
       kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:397
       kmem_cache_alloc_node+0x144/0x710 mm/slab.c:3631
       __alloc_skb+0xf4/0x730 net/core/skbuff.c:196
       alloc_skb include/linux/skbuff.h:1011 [inline]
       alloc_skb_with_frags+0x13a/0x770 net/core/skbuff.c:5288
       sock_alloc_send_pskb+0x8c9/0xad0 net/core/sock.c:2091
       sock_alloc_send_skb+0x32/0x40 net/core/sock.c:2108
       __ip6_append_data.isra.0+0x2556/0x3f20 net/ipv6/ip6_output.c:1443
       ip6_make_skb+0x391/0x5f0 net/ipv6/ip6_output.c:1806
       udpv6_sendmsg+0x2b58/0x3550 net/ipv6/udp.c:1460
       inet_sendmsg+0x1af/0x740 net/ipv4/af_inet.c:798
       sock_sendmsg_nosec net/socket.c:621 [inline]
       sock_sendmsg+0xdd/0x130 net/socket.c:631
       ___sys_sendmsg+0x409/0x910 net/socket.c:2116
       __sys_sendmmsg+0x246/0x730 net/socket.c:2211
       __do_sys_sendmmsg net/socket.c:2240 [inline]
       __se_sys_sendmmsg net/socket.c:2237 [inline]
       __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2237
       do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

other info that might help us debug this:

Chain exists of:
  (console_sem).lock --> &rt_b->rt_runtime_lock --> hrtimer_bases.lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(hrtimer_bases.lock);
                               lock(&rt_b->rt_runtime_lock);
                               lock(hrtimer_bases.lock);
  lock((console_sem).lock);

 *** DEADLOCK ***

2 locks held by syz-executor4/12722:
 #0: 000000004834bd23 (hrtimer_bases.lock){-.-.}, at: __run_hrtimer kernel/time/hrtimer.c:1391 [inline]
 #0: 000000004834bd23 (hrtimer_bases.lock){-.-.}, at: __hrtimer_run_queues+0x40f/0x1050 kernel/time/hrtimer.c:1451
 #1: 00000000ef41a80c (rcu_read_lock){....}, at: atomic_notifier_call_chain+0x0/0x190 kernel/notifier.c:329

stack backtrace:
CPU: 1 PID: 12722 Comm: syz-executor4 Not tainted 4.20.0+ #12
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1db/0x2d0 lib/dump_stack.c:113
 print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1224
 check_prev_add kernel/locking/lockdep.c:1866 [inline]
 check_prevs_add kernel/locking/lockdep.c:1979 [inline]
 validate_chain kernel/locking/lockdep.c:2350 [inline]
 __lock_acquire+0x3014/0x4a30 kernel/locking/lockdep.c:3338
 lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
 down_trylock+0x13/0x70 kernel/locking/semaphore.c:136
 __down_trylock_console_sem+0xa8/0x210 kernel/printk/printk.c:219
 console_trylock+0x15/0xa0 kernel/printk/printk.c:2242
 console_trylock_spinning kernel/printk/printk.c:1662 [inline]
 vprintk_emit+0x351/0x960 kernel/printk/printk.c:1930
 vprintk_default+0x28/0x30 kernel/printk/printk.c:1958
 vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398
 printk+0xba/0xed kernel/printk/printk.c:1991
 kasan_die_handler arch/x86/mm/kasan_init_64.c:252 [inline]
 kasan_die_handler.cold+0x11/0x23 arch/x86/mm/kasan_init_64.c:247
 notifier_call_chain+0x179/0x380 kernel/notifier.c:93
 __atomic_notifier_call_chain kernel/notifier.c:183 [inline]
 atomic_notifier_call_chain+0x96/0x190 kernel/notifier.c:193
 notify_die+0x1b2/0x270 kernel/notifier.c:549
 do_general_protection+0x13d/0x300 arch/x86/kernel/traps.c:557
 general_protection+0x1e/0x30 arch/x86/entry/entry_64.S:1142
RIP: 0010:timerqueue_add+0xf2/0x320 lib/timerqueue.c:52
Code: 48 c1 ea 03 42 80 3c 2a 00 0f 85 bc 01 00 00 49 8b 17 48 85 d2 74 3d 48 89 d3 e8 c9 ee 92 f9 48 8d 7b 18 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 a3 01 00 00 4c 8b 7b 18 4c 89 f7 4c 89 fe e8
RSP: 0018:ffff8880ae707b68 EFLAGS: 00010007
RAX: 0000000000001022 RBX: 00000000000080fe RCX: ffffffff87ef09ec
RDX: 0000000000010000 RSI: ffffffff87ef09c7 RDI: 0000000000008116
RBP: ffff8880ae707b98 R08: ffff8880a7dc4700 R09: ffffed1015ce5b90
R10: ffffed1015ce5b8f R11: ffff8880ae72dc7b R12: ffff888083075018
R13: dffffc0000000000 R14: 000000300e95abab R15: ffff88808d0165d0
 enqueue_hrtimer+0x1ae/0x570 kernel/time/hrtimer.c:951
 __run_hrtimer kernel/time/hrtimer.c:1404 [inline]
 __hrtimer_run_queues+0xc39/0x1050 kernel/time/hrtimer.c:1451
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline]
 smp_apic_timer_interrupt+0x18d/0x760 arch/x86/kernel/apic/apic.c:1060
 ? trace_hardirqs
Lost 141 message(s)!
---[ end trace a3aaebb0a9f09542 ]---
general protection fault: 0000 [#2] PREEMPT SMP KASAN
CPU: 0 PID: -1487577976 Comm:  Tainted: G      D           4.20.0+ #12
RIP: 0010:timerqueue_add+0xf2/0x320 lib/timerqueue.c:52
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Code: 48 c1 ea 03 42 80 3c 2a 00 0f 85 bc 01 00 00 49 8b 17 48 85 d2 74 3d 48 89 d3 e8 c9 ee 92 f9 48 8d 7b 18 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 a3 01 00 00 4c 8b 7b 18 4c 89 f7 4c 89 fe e8
RIP: 0010:__read_once_size include/linux/compiler.h:191 [inline]
RIP: 0010:get_running_cputimer include/linux/sched/cputime.h:85 [inline]
RIP: 0010:account_group_system_time include/linux/sched/cputime.h:149 [inline]
RIP: 0010:account_system_index_time+0xe8/0x5f0 kernel/sched/cputime.c:168
RSP: 0018:ffff8880ae707b68 EFLAGS: 00010007
Code: 04 00 00 49 8b 84 24 00 07 00 00 48 ba 00 00 00 00 00 fc ff df 48 8d b8 40 01 00 00 48 8d 88 28 01 00 00 48 89 fe 48 c1 ee 03 <0f> b6 14 16 48 89 fe 83 e6 07 40 38 f2 7f 08 84 d2 0f 85 93 03 00
RAX: 0000000000001022 RBX: 00000000000080fe RCX: ffffffff87ef09ec
RSP: 0018:ffff8880ae607a80 EFLAGS: 00010006
RDX: 0000000000010000 RSI: ffffffff87ef09c7 RDI: 0000000000008116
RAX: 0000000000000000 RBX: 1ffff11015cc0f54 RCX: 0000000000000128
RBP: ffff8880ae707b98 R08: ffff8880a7dc4700 R09: ffffed1015ce5b90
RDX: dffffc0000000000 RSI: 0000000000000028 RDI: 0000000000000140
R10: ffffed1015ce5b8f R11: ffff8880ae72dc7b R12: ffff888083075018
RBP: ffff8880ae607b48 R08: ffff8880ae61f5f0 R09: fffffbfff1336415
R13: dffffc0000000000 R14: 000000300e95abab R15: ffff88808d0165d0
R10: fffffbfff1301b45 R11: ffffffff899b20a3 R12: ffff8880a947a240
FS:  00007fdc9dd8c700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
R13: 0000000000981849 R14: 0000000000000003 R15: ffff8880ae607b20
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CR2: 0000000020008378 CR3: 000000008988d000 CR4: 00000000001406e0
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
CR2: 0000000000000068 CR3: 0000000095f28000 CR4: 00000000001406f0
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Manager Title
2019/01/06 10:39 upstream b5aef86e089a 53be0a37 .config console log report ci-upstream-kasan-gce-selinux-root
2019/01/03 22:20 upstream 645ff1e8e704 66fcd29b .config console log report ci-upstream-kasan-gce
* Struck through repros no longer work on HEAD.