rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10500 ticks this GP) idle=73e/1/0x4000000000000004 softirq=423843/423843 fqs=5226 (t=10500 jiffies g=496345 q=1968) NMI backtrace for cpu 0 CPU: 0 PID: 782 Comm: syz-executor.3 Not tainted 5.3.0-rc8+ #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+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x183/0x1cf 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:2736 [inline] rcu_sched_clock_irq.cold+0x4dd/0xc13 kernel/rcu/tree.c:2183 update_process_times+0x32/0x80 kernel/time/timer.c:1639 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1296 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:pie_timer+0x5d/0x830 net/sched/sch_pie.c:447 Code: 3c 02 00 0f 85 ac 07 00 00 48 8b 45 d0 48 8b 58 48 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 40 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 7b 07 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 63 40 49 8d RSP: 0018:ffff8880ae809c78 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffff88808788b240 RCX: ffffffff81625d35 RDX: 1ffff11010f11650 RSI: ffffffff85c6aadd RDI: ffff88808788b280 RBP: ffff8880ae809d00 R08: ffff888050b6a180 R09: fffffbfff134afc0 R10: fffffbfff134afbf R11: ffffffff89a57dff R12: 0000000000000100 R13: ffff8880ae809db0 R14: 0000000000000000 R15: dffffc0000000000 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers kernel/time/timer.c:1685 [inline] __run_timers kernel/time/timer.c:1653 [inline] run_timer_softirq+0x697/0x17a0 kernel/time/timer.c:1698 __do_softirq+0x262/0x98c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:537 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:__write_once_size include/linux/compiler.h:226 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x48/0x50 kernel/kcov.c:110 Code: 75 2b 8b 90 f0 12 00 00 83 fa 02 75 20 48 8b 88 f8 12 00 00 8b 80 f4 12 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 <48> 89 11 5d c3 0f 1f 00 65 4c 8b 04 25 40 fe 01 00 65 8b 05 a8 78 RSP: 0018:ffff8880247bf780 EFLAGS: 00000212 ORIG_RAX: ffffffffffffff13 RAX: 0000000000040000 RBX: 000000000000000e RCX: ffffc90012a36000 RDX: 0000000000013faf RSI: ffffffff830635b5 RDI: 0000000000000005 RBP: ffff8880247bf780 R08: ffff888050b6a180 R09: ffffed10048f7f07 R10: ffffed10048f7f06 R11: 0000000000000000 R12: ffff88809fe09900 R13: 0000000000000062 R14: 0000000000000362 R15: 0000000000000000 tomoyo_domain_quota_is_ok+0x325/0x540 security/tomoyo/util.c:1068 tomoyo_supervisor+0x2e8/0xef0 security/tomoyo/common.c:2087 tomoyo_audit_mount_log security/tomoyo/mount.c:32 [inline] tomoyo_mount_acl+0x51d/0x840 security/tomoyo/mount.c:166 tomoyo_mount_permission+0x16a/0x410 security/tomoyo/mount.c:237 tomoyo_sb_mount+0x35/0x40 security/tomoyo/tomoyo.c:400 security_sb_mount+0x87/0xd0 security/security.c:826 do_mount+0x1d4/0x1c30 fs/namespace.c:3053 ksys_mount+0xdb/0x150 fs/namespace.c:3320 __do_sys_mount fs/namespace.c:3334 [inline] __se_sys_mount fs/namespace.c:3331 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3331 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4598e9 Code: fd 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f7ef8391c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000004598e9 RDX: 0000000020000440 RSI: 0000000020000080 RDI: 0000000000000000 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7ef83926d4 R13: 00000000004c5ef0 R14: 00000000004da998 R15: 00000000ffffffff