rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=fa74/1/0x4000000000000000 softirq=88531/88531 fqs=0
rcu: 	(detected by 1, t=10506 jiffies, g=76013, q=255 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 27440 Comm: syz.6.3272 Not tainted 6.14.0-rc1-syzkaller-00235-g9946eaf552b1 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:mark_lock+0x120/0xc60 kernel/locking/lockdep.c:4772
Code: 00 00 00 00 c7 40 08 00 00 00 00 48 c7 40 10 00 00 00 00 48 8b 84 24 08 01 00 00 65 48 2b 04 25 28 00 00 00 0f 85 56 09 00 00 <48> 8d 65 d8 89 d0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc 48
RSP: 0018:ffffc90000007aa0 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff888028198b18 RCX: 1ffffffff2dd86ff
RDX: 0000000000000001 RSI: 0000000000000100 RDI: ffffffff96ec37f8
RBP: ffffc90000007bd8 R08: 0000000000000000 R09: fffffbfff2dd7b99
R10: ffffffff96ebdccf R11: 0000000000000001 R12: ffff888028198000
R13: 0000000000000100 R14: 0000000000000008 R15: 1ffff92000000f5a
FS:  00007f0488dd56c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000647fc000 CR4: 00000000003526f0
DR0: 0000000000000007 DR1: 000000000000000b DR2: 0000000000000002
DR3: 0000000000000008 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 mark_usage kernel/locking/lockdep.c:4672 [inline]
 __lock_acquire+0x9f1/0x3c40 kernel/locking/lockdep.c:5182
 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
 _raw_spin_lock_irq+0x36/0x50 kernel/locking/spinlock.c:170
 __run_hrtimer kernel/time/hrtimer.c:1805 [inline]
 __hrtimer_run_queues+0x2be/0xae0 kernel/time/hrtimer.c:1865
 hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1927
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 26 a8 3d f6 48 89 df e8 7e 27 3e f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 <bf> 01 00 00 00 e8 35 fe 2e f6 65 8b 05 a6 e3 aa 74 85 c0 74 16 5b
RSP: 0018:ffffc9000471f818 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffff8880293cc900 RCX: 1ffffffff2de120f
RDX: 0000000000000000 RSI: ffffffff8b6ced20 RDI: ffffffff8bd34e00
RBP: 0000000000000286 R08: 0000000000000001 R09: fffffbfff2dd7baf
R10: ffffffff96ebdd7f R11: 0000000000000004 R12: 0000000000000002
R13: ffff8880293cc940 R14: ffff8880293cc2e8 R15: ffff8880293cc768
 __unix_dgram_recvmsg+0x32a/0xe50 net/unix/af_unix.c:2456
 unix_dgram_recvmsg+0xd0/0x110 net/unix/af_unix.c:2531
 sock_recvmsg_nosec net/socket.c:1023 [inline]
 ____sys_recvmsg+0x5f8/0x6b0 net/socket.c:2791
 ___sys_recvmsg+0x115/0x1a0 net/socket.c:2835
 do_recvmmsg+0x2f8/0x740 net/socket.c:2930
 __sys_recvmmsg net/socket.c:3004 [inline]
 __do_sys_recvmmsg net/socket.c:3027 [inline]
 __se_sys_recvmmsg net/socket.c:3020 [inline]
 __x64_sys_recvmmsg+0x239/0x290 net/socket.c:3020
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f048af8cde9
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0488dd5038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f048b1a6080 RCX: 00007f048af8cde9
RDX: 0000000000010106 RSI: 00004000000000c0 RDI: 0000000000000007
RBP: 00007f048b00e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f048b1a6080 R15: 00007ffdec2819e8
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10505 jiffies! g76013 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=74002
rcu: rcu_preempt kthread starved for 10506 jiffies! g76013 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
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:28344 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5377 [inline]
 __schedule+0xf43/0x5890 kernel/sched/core.c:6764
 __schedule_loop kernel/sched/core.c:6841 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6856
 schedule_timeout+0x124/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2024
 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2226
 kthread+0x3af/0x750 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>