rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (2 ticks this GP) idle=b93c/1/0x4000000000000000 softirq=54129/54129 fqs=0
rcu: 	(detected by 0, t=10502 jiffies, g=34717, q=1971 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 10086 Comm: syz.0.1314 Not tainted 6.15.0-syzkaller-11796-g5abc7438f1e9 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:srso_alias_safe_ret+0x5/0x7 arch/x86/lib/retpoline.S:175
Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 48 8d 64 24 08 <c3> cc e8 f4 ff ff ff 0f 0b cc cc cc cc cc cc cc cc cc cc cc cc cc
RSP: 0018:ffffc90000a08d00 EFLAGS: 00000006
RAX: ffffffff81aea10f RBX: ffff88802992c340 RCX: 0000000000010000
RDX: ffff888025d29e00 RSI: 0000000000000001 RDI: 0000000000000007
RBP: 0000000000000000 R08: ffffffff99cae79b R09: 1ffffffff3395cf3
R10: dffffc0000000000 R11: fffffbfff3395cf4 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff8880b8727c40 R15: 0000000000000001
FS:  00007ff2fc09a6c0(0000) GS:ffff888125d5c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000811030 CR3: 0000000032a37000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 cpu_max_bits_warn include/linux/cpumask.h:135 [inline]
 cpumask_check include/linux/cpumask.h:142 [inline]
 cpumask_test_cpu include/linux/cpumask.h:638 [inline]
 cpu_online include/linux/cpumask.h:1197 [inline]
 trace_hrtimer_start include/trace/events/timer.h:222 [inline]
 debug_activate kernel/time/hrtimer.c:485 [inline]
 enqueue_hrtimer+0x4f/0x3a0 kernel/time/hrtimer.c:1088
 __run_hrtimer kernel/time/hrtimer.c:1778 [inline]
 __hrtimer_run_queues+0x656/0xc60 kernel/time/hrtimer.c:1825
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1056
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__might_fault+0x72/0x130 mm/memory.c:6989
Code: 3f 31 ff 44 89 fe e8 0d 16 b4 ff 45 85 ff 74 15 e8 c3 11 b4 ff 5b 41 5c 41 5d 41 5e 41 5f 5d e9 4f f6 03 ff cc 4c 89 f7 89 ee <e8> 79 31 86 ff 48 81 c3 58 05 00 00 49 89 dd 49 c1 ed 03 43 80 7c
RSP: 0018:ffffc9000e3d79e8 EFLAGS: 00000246
RAX: ffffffff820c4aa3 RBX: ffff888025d29e00 RCX: 0000000000000002
RDX: ffff888025d29e00 RSI: 00000000000000a2 RDI: ffffffff8be22a00
RBP: 00000000000000a2 R08: ffffc9000e3d7ad7 R09: ffffc9000e3d7aa0
R10: dffffc0000000000 R11: fffff52001c7af5b R12: dffffc0000000000
R13: dffffc0000000000 R14: ffffffff8be22a00 R15: 0000000000000000
 _inline_copy_from_user include/linux/uaccess.h:162 [inline]
 _copy_from_user+0x28/0xb0 lib/usercopy.c:18
 copy_from_user include/linux/uaccess.h:212 [inline]
 copy_msghdr_from_user net/socket.c:2496 [inline]
 recvmsg_copy_msghdr net/socket.c:2752 [inline]
 ___sys_recvmsg+0x12e/0x510 net/socket.c:2824
 do_recvmmsg+0x307/0x770 net/socket.c:2923
 __sys_recvmmsg net/socket.c:2997 [inline]
 __do_sys_recvmmsg net/socket.c:3020 [inline]
 __se_sys_recvmmsg net/socket.c:3013 [inline]
 __x64_sys_recvmmsg+0x190/0x240 net/socket.c:3013
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff2fb18e969
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:00007ff2fc09a038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007ff2fb3b6080 RCX: 00007ff2fb18e969
RDX: 03fffffffffffcb5 RSI: 00002000000000c0 RDI: 0000000000000005
RBP: 00007ff2fb210ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007ff2fb3b6080 R15: 00007fff82049d98
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g34717 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=22159
rcu: rcu_preempt kthread starved for 10502 jiffies! g34717 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:27320 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5396 [inline]
 __schedule+0x16f5/0x4d00 kernel/sched/core.c:6785
 __schedule_loop kernel/sched/core.c:6863 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6878
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2054
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256
 kthread+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>