rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=16a/1/0x4000000000000000 softirq=91934/91935 fqs=17 (t=10502 jiffies g=173069 q=158) NMI backtrace for cpu 0 CPU: 0 PID: 18710 Comm: syz-executor.2 Not tainted 5.8.0-rc4-next-20200710-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+0x18f/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:165 [inline] rcu_dump_cpu_stacks+0x194/0x1cf kernel/rcu/tree_stall.h:318 print_cpu_stall kernel/rcu/tree_stall.h:551 [inline] check_cpu_stall kernel/rcu/tree_stall.h:625 [inline] rcu_pending kernel/rcu/tree.c:3626 [inline] rcu_sched_clock_irq.cold+0x5b3/0xcbd kernel/rcu/tree.c:2509 update_process_times+0x25/0x60 kernel/time/timer.c:1726 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176 tick_sched_timer+0x108/0x290 kernel/time/tick-sched.c:1328 __run_hrtimer kernel/time/hrtimer.c:1520 [inline] __hrtimer_run_queues+0x1d5/0xfc0 kernel/time/hrtimer.c:1584 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1646 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1079 [inline] __sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1096 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline] sysvec_apic_timer_interrupt+0x4f/0x120 arch/x86/kernel/apic/apic.c:1090 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:587 RIP: 0010:skb_set_queue_mapping include/linux/skbuff.h:4313 [inline] RIP: 0010:netdev_core_pick_tx+0x1e0/0x2e0 net/core/dev.c:4032 Code: e8 c5 f9 3b fb 4d 63 e4 4f 8d 24 64 49 c1 e4 07 e8 b5 f9 3b fb 48 8d 7d 7c 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 9f RSP: 0018:ffffc90000007b50 EFLAGS: 00000a07 RAX: dffffc0000000000 RBX: ffff8880a8816000 RCX: ffffffff8637f5a2 RDX: 1ffff11012e731cf RSI: ffffffff8637f67b RDI: ffff888097398e7c RBP: ffff888097398e00 R08: 0000000000000000 R09: ffffffff8c5b0a3f R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8880a881640c R14: 0000000000000000 R15: 0000000000000000 __dev_queue_xmit+0x7a3/0x2d60 net/core/dev.c:4101 mrp_queue_xmit net/802/mrp.c:351 [inline] mrp_join_timer+0x8a/0xc0 net/802/mrp.c:595 call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers.part.0+0x54c/0xa20 kernel/time/timer.c:1773 __run_timers kernel/time/timer.c:1745 [inline] run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1786 __do_softirq+0x34c/0xa60 kernel/softirq.c:292 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] do_softirq_own_stack+0x111/0x170 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:387 [inline] __irq_exit_rcu kernel/softirq.c:417 [inline] irq_exit_rcu+0x229/0x270 kernel/softirq.c:429 sysvec_apic_timer_interrupt+0x54/0x120 arch/x86/kernel/apic/apic.c:1090 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:587 RIP: 0010:__sanitizer_cov_trace_pc+0x4e/0x60 kernel/kcov.c:204 Code: 00 00 85 c0 74 2b 8b 82 e8 13 00 00 83 f8 02 75 20 48 8b 8a f0 13 00 00 8b 92 ec 13 00 00 48 8b 01 48 83 c0 01 48 39 c2 76 07 <48> 89 34 c1 48 89 01 c3 66 2e 0f 1f 84 00 00 00 00 00 41 55 41 54 RSP: 0018:ffffc90004bf7818 EFLAGS: 00000212 RAX: 000000000000560e RBX: 0000000000000007 RCX: ffffc9000d8da000 RDX: 0000000000040000 RSI: ffffffff83644e9a RDI: 0000000000000005 RBP: ffff8880a2a9a500 R08: 0000000000000001 R09: ffffffff8cadaea7 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000010 R13: 00000000000000c3 R14: dffffc0000000000 R15: 0000000000000000 tomoyo_domain_quota_is_ok+0x31a/0x550 security/tomoyo/util.c:1070 tomoyo_supervisor+0x2d4/0xeb0 security/tomoyo/common.c:2089 tomoyo_audit_mount_log security/tomoyo/mount.c:32 [inline] tomoyo_mount_acl+0x524/0x840 security/tomoyo/mount.c:166 tomoyo_mount_permission+0x151/0x3f0 security/tomoyo/mount.c:237 security_sb_mount+0x66/0xc0 security/security.c:916 do_mount+0x1bf/0x1df0 fs/namespace.c:3190 __do_sys_mount fs/namespace.c:3458 [inline] __se_sys_mount fs/namespace.c:3435 [inline] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3435 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45f5fa Code: Bad RIP value. RSP: 002b:00007f7dfcb72a68 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000050b580 RCX: 000000000045f5fa RDX: 00007f7dfcb72ae0 RSI: 0000000020000240 RDI: 00007f7dfcb72b00 RBP: 000000000078bf00 R08: 00007f7dfcb72b40 R09: 00007f7dfcb72ae0 R10: 0000000000000000 R11: 0000000000000206 R12: 00000000ffffffff R13: 0000000000000c62 R14: 00000000004cea93 R15: 00007f7dfcb736d4