rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (0 ticks this GP) idle=b41/1/0x4000000000000000 softirq=36778/36778 fqs=0 (detected by 0, t=10502 jiffies, g=57201, q=812) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9255 Comm: syz-executor.4 Not tainted 5.15.109-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 RIP: 0010:__lock_acquire+0x383/0x1ff0 kernel/locking/lockdep.c:4948 Code: 48 8b 0c 24 48 ba 00 00 00 00 00 fc ff df 48 8b 44 24 08 48 89 03 4d 89 f5 4a 8d 5c f1 18 48 89 d8 48 c1 e8 03 48 89 44 24 78 <80> 3c 10 00 48 8b 6c 24 18 74 12 48 89 df e8 aa d4 66 00 48 ba 00 RSP: 0018:ffffc90000dd0a80 EFLAGS: 00000802 RAX: 1ffff1100375288c RBX: ffff88801ba94460 RCX: ffff88801ba94420 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff8880b9b2a218 RBP: 000000000000005e R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: dffffc0000000001 R12: 000000000000005e R13: 0000000000000005 R14: 0000000000000005 R15: 0000000000000000 FS: 00007f70e525b700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30424000 CR3: 0000000026a23000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __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:1689 [inline] __hrtimer_run_queues+0x662/0xcf0 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0x139/0x470 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+0x16/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [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 72 c7 a8 f7 f6 44 24 21 02 75 4e 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 37 a6 36 f7 65 8b 05 78 22 e2 75 85 c0 74 3f 48 c7 04 24 0e 36 RSP: 0018:ffffc900050278c0 EFLAGS: 00000206 RAX: f0a079787bb5eb00 RBX: 1ffff92000a04f1c RCX: ffffffff913adf03 RDX: dffffc0000000000 RSI: ffffffff8a8af0e0 RDI: 0000000000000001 RBP: ffffc90005027960 R08: ffffffff81862ae0 R09: ffffed100f2d6892 R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000 R13: 1ffff92000a04f18 R14: ffffc900050278e0 R15: 0000000000000246 spin_unlock_irqrestore include/linux/spinlock.h:418 [inline] timerfd_clock_was_set+0x1b3/0x2a0 fs/timerfd.c:113 clock_was_set+0x7e8/0x880 kernel/time/hrtimer.c:980 timekeeping_inject_offset+0x65f/0x710 kernel/time/timekeeping.c:1378 do_adjtimex+0x511/0xaa0 kernel/time/timekeeping.c:2427 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+0x1dc/0x290 kernel/time/posix-timers.c:1121 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f70e6d0a169 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:00007f70e525b168 EFLAGS: 00000246 ORIG_RAX: 0000000000000131 RAX: ffffffffffffffda RBX: 00007f70e6e2a050 RCX: 00007f70e6d0a169 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000000 RBP: 00007f70e6d65ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffde4ebc5f R14: 00007f70e525b300 R15: 0000000000022000 rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g57201 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=37739 rcu: rcu_preempt kthread starved for 10502 jiffies! g57201 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:27008 pid: 15 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5026 [inline] __schedule+0x12c4/0x4590 kernel/sched/core.c:6372 schedule+0x11b/0x1f0 kernel/sched/core.c:6455 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1884 rcu_gp_fqs_loop+0x2af/0xf70 kernel/rcu/tree.c:1958 rcu_gp_kthread+0xa4/0x360 kernel/rcu/tree.c:2131 kthread+0x3f6/0x4f0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 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: 9255 Comm: syz-executor.4 Not tainted 5.15.109-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 RIP: 0010:mark_lock+0xd6/0x340 kernel/locking/lockdep.c:4568 Code: 98 a0 bf 8a 8f eb 23 48 c7 c0 a0 df 3a 91 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 0f 02 00 00 83 3d 1e 3b d8 0f 00 74 39 31 db <48> 83 c3 50 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 RSP: 0018:ffffc90000dd0a18 EFLAGS: 00000002 RAX: 00000000000b2380 RBX: ffffffff8f95e320 RCX: ffffffff8162a448 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8fbb6278 RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff1f76c50 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000001 R13: dffffc0000000000 R14: 0000000000000001 R15: ffff88801ba94448 FS: 00007f70e525b700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30424000 CR3: 0000000026a23000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mark_usage kernel/locking/lockdep.c:4482 [inline] __lock_acquire+0xb5c/0x1ff0 kernel/locking/lockdep.c:4965 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:363 [inline] advance_sched+0x47/0x940 net/sched/sch_taprio.c:716 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x598/0xcf0 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0x139/0x470 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+0x16/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [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 72 c7 a8 f7 f6 44 24 21 02 75 4e 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 37 a6 36 f7 65 8b 05 78 22 e2 75 85 c0 74 3f 48 c7 04 24 0e 36 RSP: 0018:ffffc900050278c0 EFLAGS: 00000206 RAX: f0a079787bb5eb00 RBX: 1ffff92000a04f1c RCX: ffffffff913adf03 RDX: dffffc0000000000 RSI: ffffffff8a8af0e0 RDI: 0000000000000001 RBP: ffffc90005027960 R08: ffffffff81862ae0 R09: ffffed100f2d6892 R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000 R13: 1ffff92000a04f18 R14: ffffc900050278e0 R15: 0000000000000246 spin_unlock_irqrestore include/linux/spinlock.h:418 [inline] timerfd_clock_was_set+0x1b3/0x2a0 fs/timerfd.c:113 clock_was_set+0x7e8/0x880 kernel/time/hrtimer.c:980 timekeeping_inject_offset+0x65f/0x710 kernel/time/timekeeping.c:1378 do_adjtimex+0x511/0xaa0 kernel/time/timekeeping.c:2427 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+0x1dc/0x290 kernel/time/posix-timers.c:1121 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f70e6d0a169 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:00007f70e525b168 EFLAGS: 00000246 ORIG_RAX: 0000000000000131 RAX: ffffffffffffffda RBX: 00007f70e6e2a050 RCX: 00007f70e6d0a169 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000000 RBP: 00007f70e6d65ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffde4ebc5f R14: 00007f70e525b300 R15: 0000000000022000