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rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (1 GPs behind) idle=09f/1/0x4000000000000000 softirq=10871/10873 fqs=0 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P579/1:b..l (detected by 0, t=10506 jiffies, g=13569, q=54) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4601 Comm: syz-executor Not tainted 5.15.168-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:35 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline] RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:132 [inline] RIP: 0010:lock_acquire+0x225/0x4f0 kernel/locking/lockdep.c:5626 Code: 0f 85 a4 01 00 00 49 89 de 48 c1 eb 03 42 80 3c 2b 00 74 08 4c 89 f7 e8 a9 7e 67 00 48 c7 44 24 60 00 00 00 00 9c 8f 44 24 60 <42> 80 3c 2b 00 74 08 4c 89 f7 e8 0c 7e 67 00 f6 44 24 61 02 0f 85 RSP: 0018:ffffc90000dd0b60 EFLAGS: 00000046 RAX: 0000000000000001 RBX: 1ffff920001ba178 RCX: ffffffff81637942 RDX: dffffc0000000000 RSI: ffffffff8a8b3d20 RDI: ffffffff8ad90280 RBP: ffffc90000dd0ca8 R08: dffffc0000000000 R09: fffffbfff20ec622 R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff920001ba174 R13: dffffc0000000000 R14: ffffc90000dd0bc0 R15: 0000000000000046 FS: 0000555574ce5500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1d3a00dd38 CR3: 000000005b699000 CR4: 00000000003526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <IRQ> __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline] _raw_spin_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:170 __run_hrtimer kernel/time/hrtimer.c:1692 [inline] __hrtimer_run_queues+0x662/0xcf0 kernel/time/hrtimer.c:1752 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1814 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline] __sysvec_apic_timer_interrupt+0x139/0x470 arch/x86/kernel/apic/apic.c:1102 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1096 [inline] sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1096 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:__sanitizer_cov_trace_cmp8+0x0/0x80 kernel/kcov.c:273 Code: 39 d0 77 22 89 f8 89 f6 48 c7 44 0a 08 04 00 00 00 48 89 44 0a 10 48 89 74 0a 18 4c 89 44 0a 20 49 ff c1 4c 89 09 c3 0f 1f 00 <4c> 8b 04 24 65 48 8b 0d a4 fa 81 7e 65 8b 05 a5 fa 81 7e 25 00 01 RSP: 0018:ffffc900033f6f58 EFLAGS: 00000293 RAX: ffffffff840997c0 RBX: 00007ffc6544d974 RCX: ffff888021438000 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 00007ffc6544d974 RBP: 0000000000000004 R08: ffffffff84099771 R09: fffffbfff1bd2cbe R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000004 R13: 00007ffc6544d970 R14: ffff8880252de108 R15: 00007ffc6544d970 __chk_range_not_ok arch/x86/include/asm/uaccess.h:33 [inline] _copy_to_user+0xaf/0x130 lib/usercopy.c:38 copy_to_user include/linux/uaccess.h:200 [inline] xt_data_to_user net/netfilter/x_tables.c:316 [inline] xt_target_to_user+0x16e/0x280 net/netfilter/x_tables.c:344 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:877 [inline] get_entries net/ipv6/netfilter/ip6_tables.c:1041 [inline] do_ip6t_get_ctl+0x1123/0x1890 net/ipv6/netfilter/ip6_tables.c:1679 nf_getsockopt+0x28e/0x2b0 net/netfilter/nf_sockopt.c:116 ipv6_getsockopt+0x468/0x2ff0 net/ipv6/ipv6_sockglue.c:1492 tcp_getsockopt+0x25a/0x6fe0 net/ipv4/tcp.c:4313 __sys_getsockopt+0x2a6/0x550 net/socket.c:2247 __do_sys_getsockopt net/socket.c:2262 [inline] __se_sys_getsockopt net/socket.c:2259 [inline] __x64_sys_getsockopt+0xb1/0xc0 net/socket.c:2259 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f1d39e86d3a Code: ff c3 66 0f 1f 44 00 00 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb b8 0f 1f 44 00 00 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 a8 ff ff ff f7 RSP: 002b:00007ffc6544d7f8 EFLAGS: 00000216 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 00007ffc6544d880 RCX: 00007f1d39e86d3a RDX: 0000000000000041 RSI: 0000000000000029 RDI: 0000000000000003 RBP: 0000000000000003 R08: 00007ffc6544d81c R09: 0079746972756365 R10: 00007ffc6544d880 R11: 0000000000000216 R12: 00007f1d3a00e340 R13: 00007ffc6544d81c R14: 0000000000000000 R15: 00007f1d3a00fe40 </TASK> task:kworker/u4:3 state:R running task stack:18360 pid: 579 ppid: 2 flags:0x00004000 Workqueue: netns cleanup_net Call Trace: <TASK> context_switch kernel/sched/core.c:5027 [inline] __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373 preempt_schedule_notrace+0xf8/0x140 kernel/sched/core.c:6628 preempt_schedule_notrace_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35 rcu_is_watching+0x72/0xa0 kernel/rcu/tree.c:1124 rcu_read_unlock include/linux/rcupdate.h:768 [inline] inet_twsk_purge+0x8b5/0x9d0 net/ipv4/inet_timewait_sock.c:309 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x763/0xb60 net/core/net_namespace.c:599 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 </TASK> rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g13569 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=5075 rcu: rcu_preempt kthread starved for 10506 jiffies! g13569 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:26816 pid: 15 ppid: 2 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5027 [inline] __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373 schedule+0x11b/0x1f0 kernel/sched/core.c:6456 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1914 rcu_gp_fqs_loop+0x2bf/0x1080 kernel/rcu/tree.c:1972 rcu_gp_kthread+0xa4/0x360 kernel/rcu/tree.c:2145 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 </TASK> rcu: Stack dump where RCU GP kthread last ran: NMI backtrace for cpu 0 CPU: 0 PID: 4737 Comm: syz.0.402 Not tainted 5.15.168-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline] rcu_check_gp_kthread_starvation+0x1d2/0x240 kernel/rcu/tree_stall.h:487 print_other_cpu_stall+0x137a/0x14d0 kernel/rcu/tree_stall.h:592 check_cpu_stall kernel/rcu/tree_stall.h:745 [inline] rcu_pending kernel/rcu/tree.c:3932 [inline] rcu_sched_clock_irq+0xa38/0x1150 kernel/rcu/tree.c:2619 update_process_times+0x196/0x200 kernel/time/timer.c:1818 tick_sched_handle kernel/time/tick-sched.c:254 [inline] tick_sched_timer+0x386/0x550 kernel/time/tick-sched.c:1473 __run_hrtimer kernel/time/hrtimer.c:1688 [inline] __hrtimer_run_queues+0x55b/0xcf0 kernel/time/hrtimer.c:1752 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1814 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline] __sysvec_apic_timer_interrupt+0x139/0x470 arch/x86/kernel/apic/apic.c:1102 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1096 [inline] sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1096 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline] RIP: 0010:smp_call_function_many_cond+0xa93/0xd90 kernel/smp.c:969 Code: 04 03 84 c0 0f 85 84 00 00 00 45 8b 7d 00 44 89 fe 83 e6 01 31 ff e8 5c d5 0b 00 41 83 e7 01 75 07 e8 f1 d1 0b 00 eb 41 f3 90 <48> b8 00 00 00 00 00 fc ff df 0f b6 04 03 84 c0 75 11 41 f7 45 00 RSP: 0018:ffffc90003567780 EFLAGS: 00000246 RAX: ffffffff8174a164 RBX: 1ffff110172280b1 RCX: 0000000000040000 RDX: ffffc90003619000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: ffffc900035678c0 R08: ffffffff8174a134 R09: fffffbfff20ec621 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000001 R13: ffff8880b9140588 R14: ffff8880b903b380 R15: 0000000000000001 on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1135 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:1207 [inline] text_poke_bp_batch+0x2b4/0x930 arch/x86/kernel/alternative.c:1407 text_poke_flush arch/x86/kernel/alternative.c:1598 [inline] text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1605 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146 static_key_slow_inc_cpuslocked+0x12a/0x220 kernel/jump_label.c:144 static_key_slow_inc+0x16/0x20 kernel/jump_label.c:159 kvm_arch_vcpu_create+0x247/0x9b0 arch/x86/kvm/x86.c:11062 kvm_vm_ioctl_create_vcpu+0x2eb/0x810 virt/kvm/kvm_main.c:3724 kvm_vm_ioctl+0x60b/0xb60 virt/kvm/kvm_main.c:4473 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fa1802cdff9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa17e746038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fa180485f80 RCX: 00007fa1802cdff9 RDX: 0000000000000000 RSI: 000000000000ae41 RDI: 0000000000000004 RBP: 00007fa180340296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fa180485f80 R15: 00007ffd97a0e8e8 </TASK>
| Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2024/10/21 14:06 | linux-5.15.y | 584a40a22cb9 | f1e4447c | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-5-15-kasan | INFO: rcu detected stall in sys_getsockopt |