rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (0 ticks this GP) idle=bf1/1/0x4000000000000000 softirq=92892/92892 fqs=40 (detected by 1, t=10502 jiffies, g=158173, q=321) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 6202 Comm: syz-executor.3 Not tainted 5.16.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lock_is_held_type+0x127/0x190 kernel/locking/lockdep.c:5682 Code: 48 c7 c7 40 17 6f 8a e8 e7 10 00 00 b8 ff ff ff ff 65 0f c1 05 ea 6c f0 75 83 f8 01 75 40 48 c7 04 24 00 00 00 00 9c 8f 04 24 04 24 00 02 00 00 75 46 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b RSP: 0018:ffffc90000007c18 EFLAGS: 00000046 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000010003 RDX: ffff888012019d00 RSI: 0000000000010003 RDI: 0000000000000000 RBP: 0000000000000002 R08: ffffffff8173b8f5 R09: fffffbfff1bfd18e R10: fffffbfff1bfd18e R11: 0000000000000000 R12: 0000000000000046 R13: ffff888012019d00 R14: 00000000ffffffff R15: ffffffff8cb1daa0 FS: 00007f6f3cbb6700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2d325000 CR3: 000000007e3d5000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_is_held include/linux/lockdep.h:283 [inline] rcu_read_lock_sched_held+0x89/0x130 kernel/rcu/update.c:125 trace_hrtimer_cancel+0xab/0x260 include/trace/events/timer.h:290 debug_deactivate kernel/time/hrtimer.c:482 [inline] __run_hrtimer kernel/time/hrtimer.c:1653 [inline] __hrtimer_run_queues+0x301/0xa60 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x3b3/0x1040 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0xf9/0x270 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xd4/0x130 kernel/locking/spinlock.c:194 Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 a2 a6 bb f7 f6 44 24 21 02 75 4e 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 47 70 45 f7 65 8b 05 58 ba ed 75 85 c0 74 3f 48 c7 04 24 0e 36 RSP: 0018:ffffc9000c067be0 EFLAGS: 00000206 RAX: 6ceacdecb32add00 RBX: 1ffff9200180cf80 RCX: ffffffff81667041 RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000001 RBP: ffffc9000c067c70 R08: dffffc0000000000 R09: fffffbfff1ff35dd R10: fffffbfff1ff35dd R11: 0000000000000000 R12: dffffc0000000000 R13: 1ffff9200180cf7c R14: ffffc9000c067c00 R15: 0000000000000246 clock_was_set+0x72d/0x940 kernel/time/hrtimer.c:970 do_settimeofday64+0x618/0x7a0 kernel/time/timekeeping.c:1327 __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+0x23d/0x280 kernel/time/posix-timers.c:1067 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f6f3f640ae9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6f3cbb6188 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3 RAX: ffffffffffffffda RBX: 00007f6f3f753f60 RCX: 00007f6f3f640ae9 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 00007f6f3f69af6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe99ecb66f R14: 00007f6f3cbb6300 R15: 0000000000022000 rcu: rcu_preempt kthread starved for 10422 jiffies! g158173 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 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:R running task stack:26576 pid: 14 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0xb72/0x1460 kernel/sched/core.c:6253 schedule+0x12b/0x1f0 kernel/sched/core.c:6326 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1881 rcu_gp_fqs_loop+0x1fd/0x770 kernel/rcu/tree.c:1955 rcu_gp_kthread+0xa5/0x350 kernel/rcu/tree.c:2128 kthread+0x468/0x490 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 rcu: Stack dump where RCU GP kthread last ran: NMI backtrace for cpu 1 CPU: 1 PID: 6195 Comm: syz-executor.3 Not tainted 5.16.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106 nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_check_gp_kthread_starvation+0x1ff/0x270 kernel/rcu/tree_stall.h:481 print_other_cpu_stall kernel/rcu/tree_stall.h:586 [inline] check_cpu_stall kernel/rcu/tree_stall.h:729 [inline] rcu_pending kernel/rcu/tree.c:3878 [inline] rcu_sched_clock_irq+0x23d5/0x2bc0 kernel/rcu/tree.c:2597 update_process_times+0x197/0x200 kernel/time/timer.c:1785 tick_sched_handle kernel/time/tick-sched.c:226 [inline] tick_sched_timer+0x27d/0x420 kernel/time/tick-sched.c:1421 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x4cb/0xa60 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x3b3/0x1040 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0xf9/0x270 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline] RIP: 0010:smp_call_function_single+0x2a7/0x570 kernel/smp.c:758 Code: 6f ce 0b 00 41 83 e5 01 75 19 e8 54 ca 0b 00 e9 16 01 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 f3 90 42 0f b6 04 23 <84> c0 75 15 f7 44 24 68 01 00 00 00 0f 84 e9 00 00 00 e8 22 ca 0b RSP: 0018:ffffc9000bfe7a20 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 1ffff920017fcf51 RCX: ffff88801b69ba00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000bfe7b30 R08: ffffffff8178bdd1 R09: ffffed10173474d1 R10: ffffed10173474d1 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000001 R14: 0000000000000000 R15: ffffc9000bfe7a88 task_function_call kernel/events/core.c:119 [inline] event_function_call+0x46b/0x6e0 kernel/events/core.c:288 perf_event_release_kernel+0x1ca/0x900 kernel/events/core.c:5105 perf_release+0x37/0x40 kernel/events/core.c:5201 __fput+0x3fc/0x870 fs/file_table.c:280 task_work_run+0x146/0x1c0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x209/0x220 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300 do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f6f3f5f372b Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007ffe99ecb6d0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007f6f3f5f372b RDX: 0000001b2c721ef0 RSI: ffffffff818838bf RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b2c721e78 R10: 00000000000006e5 R11: 0000000000000293 R12: 00007f6f3f754b60 R13: 00007f6f3f754b60 R14: 00007f6f3f753f60 R15: 000000000010c55c ---------------- Code disassembly (best guess): 0: 48 c7 c7 40 17 6f 8a mov $0xffffffff8a6f1740,%rdi 7: e8 e7 10 00 00 callq 0x10f3 c: b8 ff ff ff ff mov $0xffffffff,%eax 11: 65 0f c1 05 ea 6c f0 xadd %eax,%gs:0x75f06cea(%rip) # 0x75f06d03 18: 75 19: 83 f8 01 cmp $0x1,%eax 1c: 75 40 jne 0x5e 1e: 48 c7 04 24 00 00 00 movq $0x0,(%rsp) 25: 00 26: 9c pushfq 27: 8f 04 24 popq (%rsp) * 2a: f7 04 24 00 02 00 00 testl $0x200,(%rsp) <-- trapping instruction 31: 75 46 jne 0x79 33: 41 f7 c4 00 02 00 00 test $0x200,%r12d 3a: 74 01 je 0x3d 3c: fb sti 3d: 65 gs 3e: 48 rex.W 3f: 8b .byte 0x8b