rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (0 ticks this GP) idle=d924/1/0x4000000000000000 softirq=134837/134837 fqs=0 (detected by 0, t=10505 jiffies, g=162445, q=35 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 16594 Comm: syz-executor.0 Not tainted 6.0.0-syzkaller-09589-g55be6084c8e0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 RIP: 0010:div64_u64 include/linux/math64.h:69 [inline] RIP: 0010:taprio_set_budget net/sched/sch_taprio.c:550 [inline] RIP: 0010:advance_sched+0x5e2/0x8c0 net/sched/sch_taprio.c:745 Code: ef be 08 00 00 00 e8 5d 0a 6b f9 48 89 e8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 ef e8 a7 08 6b f9 4c 89 f0 31 d2 48 f7 75 00 <48> 89 c5 48 89 df be 04 00 00 00 e8 3e 0a 6b f9 48 89 d8 48 c1 e8 RSP: 0018:ffffc900001f0c80 EFLAGS: 00000046 RAX: 0000000000028000 RBX: ffff888075f1dda0 RCX: ffffffff8871fbb3 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8880276192e0 RBP: ffff8880276192e0 R08: dffffc0000000000 R09: ffffed1004ec325d R10: ffffed1004ec325d R11: 1ffff11004ec325c R12: dffffc0000000000 R13: ffff888027619340 R14: 0000000003e80000 R15: 171deb6ed49f0000 FS: 00007fcc702b7700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9ade780558 CR3: 0000000021ba2000 CR4: 00000000003506e0 Call Trace: __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x50b/0xa60 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x3a6/0xfd0 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1096 [inline] __sysvec_apic_timer_interrupt+0xf9/0x280 arch/x86/kernel/apic/apic.c:1113 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1107 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649 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 42 b6 99 f7 f6 44 24 21 02 75 4e 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 27 0a 19 f7 65 8b 05 b8 20 bf 75 85 c0 74 3f 48 c7 04 24 0e 36 RSP: 0018:ffffc900084378a0 EFLAGS: 00000206 RAX: 8d5835792f769500 RBX: 1ffff92001086f18 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffffc90008437940 R08: dffffc0000000000 R09: ffffed1010538d92 R10: ffffed1010538d92 R11: 1ffff11010538d91 R12: dffffc0000000000 R13: 1ffff92001086f14 R14: ffffc900084378c0 R15: 0000000000000246 spin_unlock_irqrestore include/linux/spinlock.h:405 [inline] timerfd_clock_was_set+0x1d3/0x2b0 fs/timerfd.c:113 clock_was_set+0x8bd/0x930 kernel/time/hrtimer.c:980 timekeeping_inject_offset+0xa4e/0xae0 kernel/time/timekeeping.c:1395 do_adjtimex+0x4bb/0xb00 kernel/time/timekeeping.c:2444 do_clock_adjtime kernel/time/posix-timers.c:1118 [inline] __do_sys_clock_adjtime kernel/time/posix-timers.c:1130 [inline] __se_sys_clock_adjtime kernel/time/posix-timers.c:1121 [inline] __x64_sys_clock_adjtime+0x1ec/0x2a0 kernel/time/posix-timers.c:1121 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fcc6f08b5a9 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fcc702b7168 EFLAGS: 00000246 ORIG_RAX: 0000000000000131 RAX: ffffffffffffffda RBX: 00007fcc6f1ac050 RCX: 00007fcc6f08b5a9 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000000 RBP: 00007fcc6f0e6580 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdd725f12f R14: 00007fcc702b7300 R15: 0000000000022000 rcu: rcu_preempt kthread timer wakeup didn't happen for 10504 jiffies! g162445 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=98558 rcu: rcu_preempt kthread starved for 10505 jiffies! g162445 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:26936 pid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5178 [inline] __schedule+0x8f3/0xd90 kernel/sched/core.c:6490 schedule+0xcb/0x190 kernel/sched/core.c:6566 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1935 rcu_gp_fqs_loop+0x309/0x1070 kernel/rcu/tree.c:1658 rcu_gp_kthread+0xa5/0x390 kernel/rcu/tree.c:1857 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 16594 Comm: syz-executor.0 Not tainted 6.0.0-syzkaller-09589-g55be6084c8e0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 RIP: 0010:rcu_read_unlock_sched_notrace include/linux/rcupdate.h:860 [inline] RIP: 0010:trace_lock_release+0x86/0x1a0 include/trace/events/lock.h:69 Code: df 80 3c 08 00 74 0c 48 c7 c7 08 cc 12 8e e8 d1 b4 74 00 48 8b 05 62 7c aa 0c e8 25 bc 07 00 85 c0 74 11 65 ff 0d 52 1f 9a 7e <74> 42 5b 41 5c 41 5e 41 5f c3 e8 bb e7 d1 08 85 c0 74 e6 80 3d a5 RSP: 0018:ffffc900001f0b18 EFLAGS: 00000082 RAX: 0000000000000001 RBX: 0000000000000001 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8e26e428 RBP: ffffc900001f0c70 R08: dffffc0000000000 R09: fffffbfff1c4dc86 R10: fffffbfff1c4dc86 R11: 1ffffffff1c4dc85 R12: dffffc0000000000 R13: ffffffff8177f337 R14: ffffc900001f0ca0 R15: 1ffff9200003e174 FS: 00007fcc702b7700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9ade780558 CR3: 0000000021ba2000 CR4: 00000000003506e0 Call Trace: lock_release+0x81/0x870 kernel/locking/lockdep.c:5679 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline] _raw_spin_unlock_irqrestore+0x75/0x130 kernel/locking/spinlock.c:194 __run_hrtimer kernel/time/hrtimer.c:1681 [inline] __hrtimer_run_queues+0x487/0xa60 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x3a6/0xfd0 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1096 [inline] __sysvec_apic_timer_interrupt+0xf9/0x280 arch/x86/kernel/apic/apic.c:1113 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1107 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649 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 42 b6 99 f7 f6 44 24 21 02 75 4e 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 27 0a 19 f7 65 8b 05 b8 20 bf 75 85 c0 74 3f 48 c7 04 24 0e 36 RSP: 0018:ffffc900084378a0 EFLAGS: 00000206 RAX: 8d5835792f769500 RBX: 1ffff92001086f18 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffffc90008437940 R08: dffffc0000000000 R09: ffffed1010538d92 R10: ffffed1010538d92 R11: 1ffff11010538d91 R12: dffffc0000000000 R13: 1ffff92001086f14 R14: ffffc900084378c0 R15: 0000000000000246 spin_unlock_irqrestore include/linux/spinlock.h:405 [inline] timerfd_clock_was_set+0x1d3/0x2b0 fs/timerfd.c:113 clock_was_set+0x8bd/0x930 kernel/time/hrtimer.c:980 timekeeping_inject_offset+0xa4e/0xae0 kernel/time/timekeeping.c:1395 do_adjtimex+0x4bb/0xb00 kernel/time/timekeeping.c:2444 do_clock_adjtime kernel/time/posix-timers.c:1118 [inline] __do_sys_clock_adjtime kernel/time/posix-timers.c:1130 [inline] __se_sys_clock_adjtime kernel/time/posix-timers.c:1121 [inline] __x64_sys_clock_adjtime+0x1ec/0x2a0 kernel/time/posix-timers.c:1121 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fcc6f08b5a9 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fcc702b7168 EFLAGS: 00000246 ORIG_RAX: 0000000000000131 RAX: ffffffffffffffda RBX: 00007fcc6f1ac050 RCX: 00007fcc6f08b5a9 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000000 RBP: 00007fcc6f0e6580 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdd725f12f R14: 00007fcc702b7300 R15: 0000000000022000