rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (1 GPs behind) idle=5ba/1/0x4000000000000002 softirq=10930/10938 fqs=137 (t=10500 jiffies g=6329 q=105) rcu: rcu_preempt kthread starved for 10206 jiffies! g6329 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: 8116 Comm: modprobe 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:mod_memcg_page_state+0xb/0x190 include/linux/memcontrol.h:652 Code: 0b 29 2e 00 eb 05 e8 04 29 2e 00 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 41 54 53 <41> 89 f6 48 89 fb e8 da 28 2e 00 48 83 c3 38 48 89 d8 48 c1 e8 03 RSP: 0018:ffffc900024575f8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffff110152db141 RBX: ffff8880a96d8a08 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 00000000fffffffc RDI: ffffea000268bb40 RBP: ffffc90002457618 R08: 000000000003a768 R09: ffffed10150fbeaf R10: ffffed10150fbeaf R11: 0000000000000000 R12: ffff88809a927220 R13: dffffc0000000000 R14: 1ffff11013524e44 R15: ffff8880a87df568 free_thread_stack+0x168/0x590 kernel/fork.c:280 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 preempt_schedule_irq+0xc1/0x140 kernel/sched/core.c:4338 retint_kernel+0x1b/0x2b RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] RIP: 0010:slab_alloc mm/slab.c:3313 [inline] RIP: 0010:__do_kmalloc mm/slab.c:3654 [inline] RIP: 0010:__kmalloc+0x1d3/0x340 mm/slab.c:3665 Code: 00 48 89 df 57 9d 0f 1f 44 00 00 e8 87 9d ca ff eb 1d e8 20 9b ca ff 48 83 3d 80 fc 58 07 00 0f 84 66 01 00 00 48 89 df 57 9d <0f> 1f 44 00 00 48 8b 7d d0 41 0f 18 0f e9 26 00 00 00 44 89 f0 c1 RSP: 0018:ffffc90002457870 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: ffff88809434ccd4 RBX: 0000000000000286 RCX: ffffffff815c0597 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000286 RBP: ffffc900024578b0 R08: ffff88809434cc98 R09: fffffbfff13c8521 R10: fffffbfff13c8521 R11: 0000000000000000 R12: 0000000000001000 R13: ffff8880aa802000 R14: 0000000000000c40 R15: ffff88806c600000 kmalloc include/linux/slab.h:561 [inline] tomoyo_realpath_from_path+0xdc/0x7c0 security/tomoyo/realpath.c:277 tomoyo_init_log+0xf04/0x1e70 security/tomoyo/audit.c:263 tomoyo_supervisor+0x2c7/0x1330 security/tomoyo/common.c:2095 tomoyo_audit_env_log security/tomoyo/environ.c:36 [inline] tomoyo_env_perm+0x121/0x1a0 security/tomoyo/environ.c:63 tomoyo_environ security/tomoyo/domain.c:670 [inline] tomoyo_find_next_domain+0x1685/0x1ca0 security/tomoyo/domain.c:876 tomoyo_bprm_check_security+0xe3/0x130 security/tomoyo/tomoyo.c:107 security_bprm_check+0x55/0xb0 security/security.c:784 search_binary_handler+0x6a/0x660 fs/exec.c:1645 exec_binprm fs/exec.c:1701 [inline] __do_execve_file+0x1573/0x1cd0 fs/exec.c:1821 do_execveat_common fs/exec.c:1867 [inline] do_execve fs/exec.c:1884 [inline] __do_sys_execve fs/exec.c:1960 [inline] __se_sys_execve fs/exec.c:1955 [inline] __x64_sys_execve+0x94/0xb0 fs/exec.c:1955 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fd765946207 Code: 77 19 f4 48 89 d7 44 89 c0 0f 05 48 3d 00 f0 ff ff 76 e0 f7 d8 64 41 89 01 eb d8 f7 d8 64 41 89 01 eb df b8 3b 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 02 f3 c3 48 8b 15 00 8c 2d 00 f7 d8 64 89 02 RSP: 002b:00007ffdf0546048 EFLAGS: 00000207 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd765946207 RDX: 00005615536a7c80 RSI: 00007ffdf0546170 RDI: 00007fd7659e65c3 RBP: 00007ffdf05460f0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000207 R12: 00005615536a7c60 R13: 00005615536a47b4 R14: 0000000000000000 R15: 0000000000000000