rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (0 ticks this GP) idle=31a/1/0x4000000000000000 softirq=61294/61294 fqs=0 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): (detected by 1, t=10502 jiffies, g=112857, q=62) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 27030 Comm: syz-executor.4 Not tainted 5.10.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:91 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:108 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:134 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:165 [inline] RIP: 0010:check_memory_region_inline mm/kasan/generic.c:183 [inline] RIP: 0010:check_memory_region+0xde/0x180 mm/kasan/generic.c:192 Code: 74 f2 48 89 c2 b8 01 00 00 00 48 85 d2 75 56 5b 5d 41 5c c3 48 85 d2 74 5e 48 01 ea eb 09 48 83 c0 01 48 39 d0 74 50 80 38 00 <74> f2 eb d4 41 bc 08 00 00 00 48 89 ea 45 29 dc 4d 8d 1c 2c eb 0c RSP: 0018:ffffc90000007a80 EFLAGS: 00000046 RAX: fffffbfff1d776cc RBX: fffffbfff1d776cd RCX: ffffffff8155e0a3 RDX: fffffbfff1d776cd RSI: 0000000000000008 RDI: ffffffff8ebbb660 RBP: fffffbfff1d776cc R08: 0000000000000000 R09: ffffffff8ebbb667 R10: fffffbfff1d776cc R11: 0000000000000000 R12: ffff888027778df8 R13: 0000000000000000 R14: ffffffff8f11bbf8 R15: 0000000000044000 FS: 00007fa50c11e700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000007a4b2000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: instrument_atomic_read include/linux/instrumented.h:71 [inline] test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline] hlock_class kernel/locking/lockdep.c:196 [inline] check_wait_context kernel/locking/lockdep.c:4504 [inline] __lock_acquire+0x3e3/0x5c00 kernel/locking/lockdep.c:4780 lock_acquire kernel/locking/lockdep.c:5435 [inline] lock_acquire+0x2a3/0x8c0 kernel/locking/lockdep.c:5400 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:159 debug_object_activate+0x12e/0x3e0 lib/debugobjects.c:656 debug_hrtimer_activate kernel/time/hrtimer.c:420 [inline] debug_activate kernel/time/hrtimer.c:475 [inline] enqueue_hrtimer+0x23/0x3b0 kernel/time/hrtimer.c:964 __run_hrtimer kernel/time/hrtimer.c:1536 [inline] __hrtimer_run_queues+0xb54/0xea0 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1097 asm_call_irq_on_stack+0xf/0x20 __run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline] run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline] sysvec_apic_timer_interrupt+0xbd/0x100 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:_flat_send_IPI_mask+0x4d/0xc0 arch/x86/kernel/apic/apic_flat_64.c:58 Code: 00 00 00 fc ff df 48 8d 7d 60 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 04 3c 03 7e 5c 8b 55 60 89 df e8 06 04 ff ff 41 54 9d <48> 83 c4 08 5b 5d 41 5c c3 89 74 24 04 e8 01 f0 46 00 48 8b 2d 0a RSP: 0018:ffffc90002fb7ba0 EFLAGS: 00000286 RAX: 000000000000015b RBX: 0000000000000002 RCX: 1ffffffff19d93e9 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000000 RBP: ffffffff8ae379c0 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000286 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000008 __smp_call_single_queue kernel/smp.c:270 [inline] generic_exec_single+0x122/0x350 kernel/smp.c:303 smp_call_function_single+0x1a4/0x4b0 kernel/smp.c:509 smp_call_function_many_cond+0x25f/0x9d0 kernel/smp.c:648 smp_call_function_many kernel/smp.c:711 [inline] smp_call_function kernel/smp.c:733 [inline] on_each_cpu+0x4f/0x110 kernel/smp.c:832 clock_was_set+0x18/0x20 kernel/time/hrtimer.c:871 do_settimeofday64 kernel/time/timekeeping.c:1331 [inline] do_settimeofday64+0x39d/0x570 kernel/time/timekeeping.c:1297 do_sys_settimeofday64 kernel/time/time.c:195 [inline] do_sys_settimeofday64+0x1de/0x260 kernel/time/time.c:169 __do_sys_clock_settime kernel/time/posix-timers.c:1079 [inline] __se_sys_clock_settime kernel/time/posix-timers.c:1067 [inline] __x64_sys_clock_settime+0x1a1/0x280 kernel/time/posix-timers.c:1067 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45deb9 Code: 0d b4 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fa50c11dc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3 RAX: ffffffffffffffda RBX: 0000000000002000 RCX: 000000000045deb9 RDX: 0000000000000000 RSI: 0000000020000400 RDI: 0000000000000000 RBP: 000000000118bf58 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffedd98940f R14: 00007fa50c11e9c0 R15: 000000000118bf2c task:kworker/u4:2 state:R running task stack:23752 pid: 42 ppid: 2 flags:0x00004000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:3774 [inline] __schedule+0x893/0x2130 kernel/sched/core.c:4523 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:4784 irqentry_exit_cond_resched kernel/entry/common.c:357 [inline] irqentry_exit_cond_resched kernel/entry/common.c:349 [inline] irqentry_exit+0x7a/0xa0 kernel/entry/common.c:387 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:get_nulls_value include/linux/list_nulls.h:56 [inline] RIP: 0010:inet_twsk_purge+0x4ce/0x7b0 net/ipv4/inet_timewait_sock.c:297 Code: e8 a7 f4 ff ff e8 d2 5c 02 fa be 00 02 00 00 48 c7 c7 8c d4 6d 87 e8 51 a3 d4 f9 e9 0c fc ff ff e8 b7 5c 02 fa 48 8b 6c 24 20 <48> d1 eb 48 89 de 48 89 ef e8 94 54 02 fa 48 39 dd 0f 85 5f fc ff RSP: 0018:ffffc90000e97b48 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 00000000000cec83 RCX: ffffffff876dd179 RDX: ffff88801121e500 RSI: ffffffff876dd4b9 RDI: 0000000000000005 RBP: 0000000000067641 R08: 0000000000000000 R09: ffffffff8ebbb667 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff8cbc5e60 R13: ffffc90000e97ca8 R14: 000000000000000a R15: dffffc0000000000 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:190 cleanup_net+0x4ea/0xa00 net/core/net_namespace.c:604 process_one_work+0x933/0x15a0 kernel/workqueue.c:2272 worker_thread+0x64c/0x1120 kernel/workqueue.c:2418 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 rcu: rcu_preempt kthread starved for 10502 jiffies! g112857 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:I stack:28872 pid: 11 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:3774 [inline] __schedule+0x893/0x2130 kernel/sched/core.c:4523 schedule+0xcf/0x270 kernel/sched/core.c:4601 schedule_timeout+0x148/0x250 kernel/time/timer.c:1871 rcu_gp_fqs_loop kernel/rcu/tree.c:1925 [inline] rcu_gp_kthread+0xb4c/0x1c90 kernel/rcu/tree.c:2099 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296