rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-...!: (10499 ticks this GP) idle=3ca/1/0x4000000000000002 softirq=10801/10801 fqs=1
(t=10501 jiffies g=6701 q=68)
rcu: rcu_preempt kthread starved for 10499 jiffies! g6701 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt R running task 29032 10 2 0x80004000
Call Trace:
context_switch kernel/sched/core.c:3385 [inline]
__schedule+0x9a0/0xcc0 kernel/sched/core.c:4081
schedule+0x181/0x210 kernel/sched/core.c:4155
schedule_timeout+0x14f/0x240 kernel/time/timer.c:1895
rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline]
rcu_gp_kthread+0xed8/0x1770 kernel/rcu/tree.c:1821
kthread+0x332/0x350 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 0
CPU: 0 PID: 8142 Comm: rsyslogd Not tainted 5.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fb/0x318 lib/dump_stack.c:118
nmi_cpu_backtrace+0xaf/0x1a0 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x174/0x290 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x15a/0x220 kernel/rcu/tree_stall.h:254
print_cpu_stall kernel/rcu/tree_stall.h:455 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:529 [inline]
rcu_pending kernel/rcu/tree.c:2827 [inline]
rcu_sched_clock_irq+0xe25/0x1ad0 kernel/rcu/tree.c:2271
update_process_times+0x12d/0x180 kernel/time/timer.c:1726
tick_sched_handle kernel/time/tick-sched.c:167 [inline]
tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1310
__run_hrtimer kernel/time/hrtimer.c:1514 [inline]
__hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1576
hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1638
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:35 [inline]
RIP: 0010:memcg_kmem_enabled include/linux/memcontrol.h:1389 [inline]
RIP: 0010:memcg_kmem_uncharge include/linux/memcontrol.h:1401 [inline]
RIP: 0010:free_thread_stack+0x11f/0x590 kernel/fork.c:284
Code: 3e e8 e5 96 ee ff 48 c1 e8 06 48 83 e0 c0 48 bf 00 00 00 00 00 ea ff ff 48 01 c7 be 03 00 00 00 e8 06 a2 60 00 e9 5d 04 00 00 5c 2d 2e 00 48 89 df 31 f6 e8 42 af 6e 00 43 80 3c 2e 00 74 08
RSP: 0018:ffffc900019e7a60 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 1ffff11012411f01 RBX: ffffea00023ef980 RCX: ffff8880a765e040
RDX: 0000000000000000 RSI: 00000000fffffffc RDI: ffffea00023ef980
RBP: ffffc900019e7a98 R08: dffffc0000000000 R09: fffffbfff1287025
R10: fffffbfff1287025 R11: 0000000000000000 R12: ffff88809208f8a0
R13: dffffc0000000000 R14: 1ffff11012411f14 R15: ffff8880a8cc7528
release_task_stack kernel/fork.c:440 [inline]
put_task_stack+0xa3/0x130 kernel/fork.c:451
finish_task_switch+0x3f1/0x550 kernel/sched/core.c:3256
context_switch kernel/sched/core.c:3388 [inline]
__schedule+0x9a8/0xcc0 kernel/sched/core.c:4081
schedule+0x181/0x210 kernel/sched/core.c:4155
do_syslog+0xdc7/0x1740 kernel/printk/printk.c:1525
kmsg_read+0x94/0xd0 fs/proc/kmsg.c:40
proc_reg_read+0x1e2/0x2d0 fs/proc/inode.c:223
__vfs_read+0xb8/0x730 fs/read_write.c:425
vfs_read+0x1dd/0x420 fs/read_write.c:461
ksys_read+0x117/0x220 fs/read_write.c:587
__do_sys_read fs/read_write.c:597 [inline]
__se_sys_read fs/read_write.c:595 [inline]
__x64_sys_read+0x7b/0x90 fs/read_write.c:595
do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f438f8f21fd
Code: d1 20 00 00 75 10 b8 00 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 5e fa ff ff 48 89 04 24 b8 00 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 a7 fa ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007f438ce91e30 EFLAGS: 00000293 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00000000014c0650 RCX: 00007f438f8f21fd
RDX: 0000000000000fff RSI: 00007f438e6c65a0 RDI: 0000000000000004
RBP: 0000000000000000 R08: 00000000014ab260 R09: 0000000004000001
R10: 0000000000000001 R11: 0000000000000293 R12: 000000000065e420
R13: 00007f438ce929c0 R14: 00007f438ff37040 R15: 0000000000000003