rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 0, t=10502 jiffies, g=19517, q=128 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294991767-4294981265), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10502 jiffies! g19517 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:28448 pid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5304 [inline] __schedule+0xc91/0x5770 kernel/sched/core.c:6622 schedule+0xde/0x1a0 kernel/sched/core.c:6698 schedule_timeout+0x14e/0x2b0 kernel/time/timer.c:2167 rcu_gp_fqs_loop+0x190/0x910 kernel/rcu/tree.c:1608 rcu_gp_kthread+0x23a/0x360 kernel/rcu/tree.c:1807 kthread+0x2e8/0x3a0 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: 8895 Comm: syz-executor.2 Not tainted 6.3.0-rc2-syzkaller-00462-g5cdfdd6da323 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 RIP: 0010:instrument_atomic_read include/linux/instrumented.h:72 [inline] RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] RIP: 0010:hlock_class kernel/locking/lockdep.c:228 [inline] RIP: 0010:__lock_acquire+0x16e5/0x5d40 kernel/locking/lockdep.c:5052 Code: 3c 03 0f 8e a0 2e 00 00 41 0f b7 5c 24 f8 66 81 e3 ff 1f 0f b7 db be 08 00 00 00 48 89 d8 48 c1 e8 06 48 8d 3c c5 80 9b 4d 91 86 93 6f 00 48 0f a3 1d ce 3a e9 0f 0f 83 2c 06 00 00 48 8d 1c RSP: 0018:ffffc900001e0ae8 EFLAGS: 00000013 RAX: 0000000000000001 RBX: 0000000000000065 RCX: ffffffff81645879 RDX: 1ffff1100fafdc48 RSI: 0000000000000008 RDI: ffffffff914d9b88 RBP: ffff88807d7ee26a R08: 0000000000000000 R09: ffffffff914d9b87 R10: fffffbfff229b370 R11: 0000000000000000 R12: ffff88807d7ee248 R13: ffff88807d7ed7c0 R14: 0000000000000000 R15: b68f5062fb0dcb72 FS: 00007f12ce434700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32622000 CR3: 000000006bdeb000 CR4: 0000000000350ee0 Call Trace: lock_acquire kernel/locking/lockdep.c:5669 [inline] lock_acquire+0x1af/0x520 kernel/locking/lockdep.c:5634 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3d/0x60 kernel/locking/spinlock.c:162 debug_object_deactivate lib/debugobjects.c:739 [inline] debug_object_deactivate+0x105/0x300 lib/debugobjects.c:727 debug_hrtimer_deactivate kernel/time/hrtimer.c:425 [inline] debug_deactivate kernel/time/hrtimer.c:481 [inline] __run_hrtimer kernel/time/hrtimer.c:1653 [inline] __hrtimer_run_queues+0x3f3/0xbe0 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x320/0x7b0 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1096 [inline] __sysvec_apic_timer_interrupt+0x14a/0x430 arch/x86/kernel/apic/apic.c:1113 sysvec_apic_timer_interrupt+0x92/0xc0 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+0x3c/0x70 kernel/locking/spinlock.c:194 Code: 74 24 10 e8 a6 70 5f f7 48 89 ef e8 3e dd 5f f7 81 e3 00 02 00 00 75 25 9c 58 f6 c4 02 75 2d 48 85 db 74 01 fb bf 01 00 00 00 cf 08 52 f7 65 8b 05 90 76 fe 75 85 c0 74 0a 5b 5d c3 e8 1c 2b RSP: 0018:ffffc90015e9fcb0 EFLAGS: 00000206 RAX: 0000000000000002 RBX: 0000000000000200 RCX: 1ffffffff229b48e RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 RBP: ffff8880b982b800 R08: 0000000000000001 R09: ffffffff914d9b87 R10: 0000000000000001 R11: 0000000000000002 R12: 0000000000000004 R13: 1bc16d00edaf876e R14: 0000000000000000 R15: dffffc0000000000 clock_was_set+0x610/0x810 kernel/time/hrtimer.c:970 do_settimeofday64 kernel/time/timekeeping.c:1345 [inline] do_settimeofday64+0x3c4/0x5d0 kernel/time/timekeeping.c:1312 do_sys_settimeofday64 kernel/time/time.c:195 [inline] do_sys_settimeofday64+0x1e2/0x270 kernel/time/time.c:169 __do_sys_clock_settime kernel/time/posix-timers.c:1088 [inline] __se_sys_clock_settime kernel/time/posix-timers.c:1076 [inline] __x64_sys_clock_settime+0x1a5/0x280 kernel/time/posix-timers.c:1076 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f12cd68c0f9 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:00007f12ce434168 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3 RAX: ffffffffffffffda RBX: 00007f12cd7abf80 RCX: 00007f12cd68c0f9 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 00007f12cd6e7b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffaa59171f R14: 00007f12ce434300 R15: 0000000000022000 vkms_vblank_simulate: vblank timer overrun