rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=2064/1/0x4000000000000000 softirq=58898/58903 fqs=4
rcu: 	(detected by 1, t=10502 jiffies, g=56937, q=391 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 13912 Comm: syz.9.2927 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:lock_acquire+0xb9/0x360 kernel/locking/lockdep.c:5844
Code: ac cb df 0d 00 0f 84 fa 00 00 00 65 8b 05 7f 3e d1 10 85 c0 0f 85 eb 00 00 00 65 48 8b 04 25 08 50 6e 92 83 b8 2c 0b 00 00 00 <0f> 85 d5 00 00 00 48 c7 44 24 30 00 00 00 00 9c 8f 44 24 30 4c 89
RSP: 0018:ffffc90000007bd0 EFLAGS: 00000046
RAX: ffff88807a9adac0 RBX: 0000000000000000 RCX: 3ce55821de179900
RDX: 0000000000000000 RSI: ffffffff89602494 RDI: 1ffffffff1be7adc
RBP: ffffffff89602478 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1005fe305e R12: 0000000000000002
R13: ffffffff8df3d6e0 R14: 0000000000000000 R15: 0000000000000000
FS:  000055556c3ed500(0000) GS:ffff88812613b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3dc029 CR3: 000000005c63d000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 rcu_read_lock include/linux/rcupdate.h:867 [inline]
 advance_sched+0xa14/0xc90 net/sched/sch_taprio.c:990
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x52c/0xc60 kernel/time/hrtimer.c:1841
 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
 __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1058
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 5b ab 7e f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 83 d9 46 f6 65 8b 05 dc 38 25 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc9000ea3fb00 EFLAGS: 00000206
RAX: 3ce55821de179900 RBX: 0000000000000212 RCX: 3ce55821de179900
RDX: 0000000000000000 RSI: ffffffff8d70e34e RDI: 0000000000000001
RBP: ffffc9000ea3fb80 R08: ffffffff8f7ced77 R09: 1ffffffff1ef9dae
R10: dffffc0000000000 R11: fffffbfff1ef9daf R12: dffffc0000000000
R13: 0000000000000002 R14: ffffffff999c5c10 R15: 1ffff92001d47f60
 debug_hrtimer_init_on_stack kernel/time/hrtimer.c:432 [inline]
 debug_setup_on_stack kernel/time/hrtimer.c:470 [inline]
 hrtimer_setup_sleeper_on_stack+0x24/0x80 kernel/time/hrtimer.c:2083
 futex_setup_timer+0x48/0xd0 kernel/futex/core.c:469
 futex_wait+0xe8/0x360 kernel/futex/waitwake.c:712
 do_futex+0x333/0x420 kernel/futex/syscalls.c:130
 __do_sys_futex kernel/futex/syscalls.c:207 [inline]
 __se_sys_futex+0x36f/0x400 kernel/futex/syscalls.c:188
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8cc7b8f6c9
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:00007fff61235d08 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 0000000000060682 RCX: 00007f8cc7b8f6c9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f8cc7de5fac
RBP: 0000000000000032 R08: 3fffffffffffffff R09: 0000000361235fff
R10: 00007fff61235e00 R11: 0000000000000246 R12: 00007f8cc7de5fac
R13: 00007fff61235e00 R14: 00000000000606b4 R15: 00007fff61235e20
 </TASK>
rcu: rcu_preempt kthread starved for 10494 jiffies! g56937 f0x0 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:27288 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
 __schedule_loop kernel/sched/core.c:7011 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7026
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 5837 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:arch_static_branch mm/slub.c:6723 [inline]
RIP: 0010:__slub_debug_enabled mm/slab.h:492 [inline]
RIP: 0010:kmem_cache_debug_flags mm/slab.h:513 [inline]
RIP: 0010:cache_from_obj+0x2/0x140 mm/slub.c:6727
Code: ff 48 ff c8 49 89 c5 e9 18 fa ff ff 90 0f 0b 90 e9 29 ff ff ff 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 <41> 56 53 66 90 48 89 f8 5b 41 5e 41 5f e9 27 ab f5 fe cc f3 0f 1e
RSP: 0018:ffffc90000a08a58 EFLAGS: 00000292
RAX: f2fac7a1b34c0f00 RBX: ffff88807bd28680 RCX: ffff888027335ac0
RDX: 0000000000000100 RSI: ffff88807bd28680 RDI: ffff888141294b40
RBP: ffff88807bd28808 R08: ffffffff8f7ced77 R09: 1ffffffff1ef9dae
R10: dffffc0000000000 R11: fffffbfff1ef9daf R12: ffff88807bd28802
R13: 1ffff1100891d4e1 R14: 0000000000000000 R15: ffff8880448ea640
FS:  0000555568692500(0000) GS:ffff88812623b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fda13e6b000 CR3: 0000000058483000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 kmem_cache_free+0x27/0x690 mm/slub.c:6748
 skb_release_data+0x62d/0x7c0 net/core/skbuff.c:1087
 skb_release_all net/core/skbuff.c:1152 [inline]
 __kfree_skb net/core/skbuff.c:1166 [inline]
 consume_skb+0x9e/0xf0 net/core/skbuff.c:1398
 mac80211_hwsim_beacon_tx+0x3f0/0x860 drivers/net/wireless/virtual/mac80211_hwsim.c:2365
 __iterate_interfaces+0x2ab/0x590 net/mac80211/util.c:761
 ieee80211_iterate_active_interfaces_atomic+0xdb/0x180 net/mac80211/util.c:797
 mac80211_hwsim_beacon+0xbb/0x180 drivers/net/wireless/virtual/mac80211_hwsim.c:2395
 __run_hrtimer kernel/time/hrtimer.c:1777 [inline]
 __hrtimer_run_queues+0x52c/0xc60 kernel/time/hrtimer.c:1841
 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1858
 handle_softirqs+0x286/0x870 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216
Code: 8b 3d 54 e2 d2 0b 48 89 de 5b e9 83 8b 5a 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0c 25 08 50 6e 92 65 8b 15 58 4c ae 10 81 e2 00 01 ff 00
RSP: 0018:ffffc90004057538 EFLAGS: 00000202
RAX: ffffffff81b4944b RBX: 1ffff11017108441 RCX: ffff888027335ac0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900040576c0 R08: ffffffff8f7ced77 R09: 1ffffffff1ef9dae
R10: dffffc0000000000 R11: fffffbfff1ef9daf R12: ffff8880b8842208
R13: dffffc0000000000 R14: ffff8880b893b240 R15: 0000000000000000
 csd_lock_wait kernel/smp.c:342 [inline]
 smp_call_function_many_cond+0xd4b/0x12d0 kernel/smp.c:877
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1381 [inline]
 flush_tlb_mm_range+0x6b1/0x12d0 arch/x86/mm/tlb.c:1471
 dup_mmap+0x1594/0x1b10 mm/mmap.c:1873
 dup_mm kernel/fork.c:1489 [inline]
 copy_mm+0x13c/0x4b0 kernel/fork.c:1541
 copy_process+0x1706/0x3c00 kernel/fork.c:2181
 kernel_clone+0x21e/0x840 kernel/fork.c:2609
 __do_sys_clone kernel/fork.c:2750 [inline]
 __se_sys_clone kernel/fork.c:2734 [inline]
 __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2734
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff616f85e13
Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffd398ac378 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff616f85e13
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 00005555686927d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 00000000000605d2 R15: 00007ffd398ac510
 </TASK>