rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (1 GPs behind) idle=9d6/1/0x4000000000000004 softirq=171569/171570 fqs=15 rcu: (t=10500 jiffies g=256229 q=530) rcu: rcu_preempt kthread starved for 10393 jiffies! g256229 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29136 10 2 0x80000000 Call Trace: schedule+0x8d/0x1b0 kernel/sched/core.c:3559 schedule_timeout+0x4d1/0xf20 kernel/time/timer.c:1806 rcu_gp_kthread+0xcee/0x2060 kernel/rcu/tree.c:2202 kthread+0x34a/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 NMI backtrace for cpu 1 CPU: 1 PID: 5332 Comm: syz-executor.0 Not tainted 4.19.118-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+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x170/0x1bb kernel/rcu/tree.c:1340 print_cpu_stall kernel/rcu/tree.c:1478 [inline] check_cpu_stall kernel/rcu/tree.c:1550 [inline] __rcu_pending kernel/rcu/tree.c:3293 [inline] rcu_pending kernel/rcu/tree.c:3336 [inline] rcu_check_callbacks.cold+0x634/0xddc kernel/rcu/tree.c:2682 update_process_times+0x2a/0x70 kernel/time/timer.c:1638 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168 tick_sched_timer+0x42/0x130 kernel/time/tick-sched.c:1278 __run_hrtimer kernel/time/hrtimer.c:1401 [inline] __hrtimer_run_queues+0x2fc/0xd50 kernel/time/hrtimer.c:1463 hrtimer_interrupt+0x312/0x770 kernel/time/hrtimer.c:1521 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline] smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1092 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:lock_acquire+0x1ec/0x400 kernel/locking/lockdep.c:3910 Code: 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 cd 01 00 00 48 83 3d 69 9e 82 07 00 0f 84 38 01 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 83 c4 20 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65 8b RSP: 0018:ffff8880ae707cb0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff11a4ac9 RBX: ffff88809b64e440 RCX: 00000000504b7e83 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000286 RBP: ffff888084b29b78 R08: 000000000000160e R09: 0000000000000003 R10: ffff88809b64ed40 R11: ffffffff8b3bb7f0 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffff888094fa42d0 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] mrp_join_timer+0x26/0x80 net/802/mrp.c:593 call_timer_fn+0x177/0x700 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers kernel/time/timer.c:1684 [inline] __run_timers kernel/time/timer.c:1652 [inline] run_timer_softirq+0x5d0/0x1540 kernel/time/timer.c:1697 __do_softirq+0x26c/0x93c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x17b/0x1c0 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:544 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893 RIP: 0010:check_memory_region_inline mm/kasan/kasan.c:251 [inline] RIP: 0010:check_memory_region+0x9/0x180 mm/kasan/kasan.c:267 Code: 48 8d 47 0f 48 89 c6 48 c1 ee 03 0f b6 14 16 84 d2 74 d8 83 e0 07 38 c2 40 0f 9e c6 eb c8 0f 1f 00 48 85 f6 0f 84 55 01 00 00 <48> b8 ff ff ff ff ff 7f ff ff 0f b6 d2 48 39 c7 0f 86 f9 00 00 00 RSP: 0018:ffff888055faf6a8 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: ffff8880ae723980 RCX: ffffffff8156809c RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880ae723990 RBP: ffff8880ae723990 R08: ffff88809b64e440 R09: 0000000000000001 R10: ffff88809b64ecf0 R11: 000000003ae04d1e R12: ffffea000227b288 R13: 0000000000000000 R14: 0000000000000000 R15: dead000000000100 atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] rcu_dynticks_curr_cpu_in_eqs+0x4c/0xa0 kernel/rcu/tree.c:350 rcu_is_watching+0xc/0x20 kernel/rcu/tree.c:1025 rcu_read_lock include/linux/rcupdate.h:628 [inline] lock_page_memcg+0x135/0x230 mm/memcontrol.c:1908 page_remove_file_rmap mm/rmap.c:1215 [inline] page_remove_rmap+0x523/0x1260 mm/rmap.c:1300 zap_pte_range mm/memory.c:1338 [inline] zap_pmd_range mm/memory.c:1440 [inline] zap_pud_range mm/memory.c:1469 [inline] zap_p4d_range mm/memory.c:1490 [inline] unmap_page_range+0xcec/0x1de0 mm/memory.c:1511 unmap_single_vma+0x196/0x300 mm/memory.c:1556 unmap_vmas+0xa9/0x180 mm/memory.c:1586 exit_mmap+0x2b2/0x510 mm/mmap.c:3091 __mmput kernel/fork.c:1015 [inline] mmput+0x14e/0x4a0 kernel/fork.c:1036 exit_mm kernel/exit.c:546 [inline] do_exit+0xac8/0x2f30 kernel/exit.c:867 do_group_exit+0x125/0x350 kernel/exit.c:983 get_signal+0x3ec/0x1f90 kernel/signal.c:2588 do_signal+0x8f/0x1710 arch/x86/kernel/signal.c:821 exit_to_usermode_loop+0x22b/0x2b0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c829 Code: Bad RIP value. RSP: 002b:00007f9d9c031c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: 0000000000000004 RBX: 0000000000506880 RCX: 000000000045c829 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000000a RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000b77 R14: 00000000004cda8d R15: 00007f9d9c0326d4 systemd[1]: systemd-journald.service: Main process exited, code=killed, status=6/ABRT systemd[1]: systemd-journald.service: Unit entered failed state. systemd[1]: systemd-journald.service: Failed with result 'watchdog'. systemd[1]: systemd-journald.service: Service has no hold-off time, scheduling restart. systemd[1]: Stopped Flush Journal to Persistent Storage. systemd[1]: Stopping Flush Journal to Persistent Storage... systemd[1]: Stopped Journal Service. systemd[1]: Starting Journal Service... systemd-journald[5382]: File /run/log/journal/64dd78f1a75445a997c532444ad0f085/system.journal corrupted or uncleanly shut down, renaming and replacing. systemd[1]: Started Journal Service.