syzbot

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=10021, q=65 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10497 (4294967686-4294957189), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10498 jiffies! g10021 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:25920 pid:16    tgid:16    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5409 [inline]
 __schedule+0xf15/0x5d00 kernel/sched/core.c:6746
 __schedule_loop kernel/sched/core.c:6823 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6838
 schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2582
 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:1663
 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:1862
 kthread+0x2c1/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
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: 5121 Comm: syz-executor283 Not tainted 6.9.0-rc6-syzkaller-00290-gb9158815de52 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:__this_cpu_preempt_check+0x0/0x20 lib/smp_processor_id.c:65
Code: c6 60 56 6f 8b 48 c7 c7 a0 56 6f 8b e9 f9 fe ff ff 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 89 fe 48 c7 c7 e0 56 6f 8b e9 cd fe ff ff 66 2e 0f
RSP: 0018:ffffc90000a08b50 EFLAGS: 00000046
RAX: 0000000000000007 RBX: ffffffff8f9f8998 RCX: ffffffff816be109
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8b0cb0c0
RBP: 1ffff9200014116d R08: 0000000000000000 R09: fffffbfff1f3eaba
R10: ffffffff8f9f55d7 R11: 0000000000000002 R12: ffffffff929ee3a8
R13: 0000000000000001 R14: ffff88802afd8000 R15: 0000000000000000
FS:  000055556a7603c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002006b000 CR3: 000000002a188000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 lockdep_recursion_inc kernel/locking/lockdep.c:462 [inline]
 lock_release+0x15e/0x6c0 kernel/locking/lockdep.c:5773
 do_write_seqcount_end include/linux/seqlock.h:515 [inline]
 update_pvclock_gtod arch/x86/kvm/x86.c:2297 [inline]
 pvclock_gtod_notify+0x3ba/0x550 arch/x86/kvm/x86.c:9634
 notifier_call_chain+0xb9/0x410 kernel/notifier.c:93
 update_pvclock_gtod kernel/time/timekeeping.c:672 [inline]
 timekeeping_update+0x2b4/0x4c0 kernel/time/timekeeping.c:768
 timekeeping_advance+0x918/0xf20 kernel/time/timekeeping.c:2216
 update_wall_time+0x11/0x40 kernel/time/timekeeping.c:2232
 tick_do_update_jiffies64 kernel/time/tick-sched.c:149 [inline]
 tick_do_update_jiffies64+0x22e/0x380 kernel/time/tick-sched.c:57
 tick_sched_do_timer kernel/time/tick-sched.c:232 [inline]
 tick_nohz_handler+0x3bd/0x530 kernel/time/tick-sched.c:290
 __run_hrtimer kernel/time/hrtimer.c:1692 [inline]
 __hrtimer_run_queues+0x657/0xcc0 kernel/time/hrtimer.c:1756
 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1818
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
 __sysvec_apic_timer_interrupt+0x10f/0x450 arch/x86/kernel/apic/apic.c:1049
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__sanitizer_cov_trace_pc+0x18/0x60 kernel/kcov.c:203
Code: 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 48 8b 15 44 11 76 7e 65 8b 05 45 11 76 7e a9 00 01 ff 00 <48> 8b 34 24 74 0f f6 c4 01 74 35 8b 82 14 16 00 00 85 c0 74 2b 8b
RSP: 0018:ffffc9000334fcf8 EFLAGS: 00000246
RAX: 0000000080000000 RBX: 0000000000000000 RCX: ffffffff81bdbb5e
RDX: ffff88802afd8000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffffc9000334fdf8 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88802afd8000
R13: ffffc9000334ff58 R14: 0000000000000000 R15: 00007f43e7f6ce79
 rseq_ip_fixup kernel/rseq.c:330 [inline]
 __rseq_handle_notify_resume+0x4cc/0x1090 kernel/rseq.c:329
 rseq_handle_notify_resume include/linux/rseq.h:38 [inline]
 rseq_signal_deliver include/linux/rseq.h:47 [inline]
 setup_rt_frame arch/x86/kernel/signal.c:212 [inline]
 handle_signal arch/x86/kernel/signal.c:267 [inline]
 arch_do_signal_or_restart+0x42c/0x7e0 arch/x86/kernel/signal.c:312
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x14a/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xdc/0x260 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f43e7f6ce79
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 18 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcfc3f3ab8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f43e7f6ce79
RDX: 000000002006b000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000000f4240 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000031215
R13: 00007ffcfc3f3ad8 R14: 00007ffcfc3f3b30 R15: 00007ffcfc3f3b20
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.468 msecs