rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 0, t=10506 jiffies, g=127621, q=70 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295141833-4295131331), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10502 jiffies! g127621 f0x2 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:26552 pid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5304 [inline] __schedule+0x179d/0x4690 kernel/sched/core.c:6622 schedule+0xc3/0x180 kernel/sched/core.c:6698 schedule_timeout+0x1bd/0x310 kernel/time/timer.c:2167 rcu_gp_fqs_loop+0x2c6/0x1010 kernel/rcu/tree.c:1608 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:1807 kthread+0x270/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 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: 29025 Comm: syz-executor.4 Not tainted 6.3.0-rc2-syzkaller-00006-gfc89d7fb499b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 RIP: 0010:check_wait_context kernel/locking/lockdep.c:4738 [inline] RIP: 0010:__lock_acquire+0x600/0x1f80 kernel/locking/lockdep.c:5006 Code: 0f 84 f9 03 00 00 0f b6 1b 41 0f b6 04 17 84 c0 0f 85 21 12 00 00 41 f6 46 01 80 0f 85 de 03 00 00 84 db 40 0f b6 c5 0f b6 cb <0f> 44 c8 89 4c 24 3c 48 8b 44 24 28 0f b6 04 10 84 c0 0f 85 9d 13 RSP: 0018:ffffc900001e0a00 EFLAGS: 00000046 RAX: 0000000000000002 RBX: 0000000000000000 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: ffff88801ff0e1f8 RDI: ffffffff902dc1c0 RBP: 0000000000000002 R08: dffffc0000000000 R09: fffffbfff205b839 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88801ff0e1f0 R13: ffff88801ff0d7c0 R14: ffff88801ff0e268 R15: 1ffff11003fe1c4d FS: 00007f3458a11700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3458a10d38 CR3: 0000000030954000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x223/0x5b0 kernel/locking/lockdep.c:5669 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 debug_object_deactivate+0x65/0x420 lib/debugobjects.c:739 debug_hrtimer_deactivate kernel/time/hrtimer.c:425 [inline] debug_deactivate+0x1b/0x2d0 kernel/time/hrtimer.c:481 __run_hrtimer kernel/time/hrtimer.c:1653 [inline] __hrtimer_run_queues+0x321/0xec0 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x396/0x980 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1096 [inline] __sysvec_apic_timer_interrupt+0x181/0x590 arch/x86/kernel/apic/apic.c:1113 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1107 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194 Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 ce de 29 f7 f6 44 24 21 02 75 4e 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 f3 84 a7 f6 65 8b 05 94 58 4c 75 85 c0 74 3f 48 c7 04 24 0e 36 RSP: 0018:ffffc9000504f900 EFLAGS: 00000206 RAX: 1c1444ab28254c00 RBX: 1ffff92000a09f24 RCX: ffffffff816b2b6a RDX: dffffc0000000000 RSI: ffffffff8aea8aa0 RDI: 0000000000000001 RBP: ffffc9000504f990 R08: dffffc0000000000 R09: fffffbfff205b839 R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000 R13: 1ffff92000a09f20 R14: ffffc9000504f920 R15: 0000000000000246 clock_was_set+0x6a1/0x830 kernel/time/hrtimer.c:970 timekeeping_inject_offset+0x663/0x710 kernel/time/timekeeping.c:1395 do_adjtimex+0x515/0xab0 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+0x1e0/0x290 kernel/time/posix-timers.c:1121 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f3457c8c0f9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3458a11168 EFLAGS: 00000246 ORIG_RAX: 0000000000000131 RAX: ffffffffffffffda RBX: 00007f3457dabf80 RCX: 00007f3457c8c0f9 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000000 RBP: 00007f3457ce7b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc76d5f40f R14: 00007f3458a11300 R15: 0000000000022000