rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 1-...!: (1 GPs behind) idle=09c4/1/0x4000000000000002 softirq=90298/90299 fqs=1
(detected by 0, t=10502 jiffies, g=135717, q=16 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 22308 Comm: syz.2.5507 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:check_wait_context kernel/locking/lockdep.c:-1 [inline]
RIP: 0010:__lock_acquire+0xb9a/0x7c40 kernel/locking/lockdep.c:5013
Code: 8e 80 e1 07 80 c1 03 38 c1 0f 8c c1 fe ff ff 48 c7 c7 a8 3f 21 8e e8 d5 50 6f 00 49 b8 00 00 00 00 00 fc ff df e9 a6 fe ff ff <8b> 84 24 80 00 00 00 38 44 24 30 4c 8b 74 24 20 4c 8b 7c 24 08 76
RSP: 0018:ffffc900001e0260 EFLAGS: 00000046
RAX: 0000000000000003 RBX: 0000000000000003 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90b10240
RBP: ffffc900001e0490 R08: dffffc0000000000 R09: 1ffffffff2162048
R10: dffffc0000000000 R11: fffffbfff2162049 R12: ffff888080bac6d8
R13: ffff888080bac778 R14: ffffffff9049a37a R15: ffff888080bac778
FS: 00007fa8635f66c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa8635d4ff8 CR3: 0000000053b7c000 CR4: 00000000003506e0
DR0: 0000200000000300 DR1: 00002000000000c0 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676
rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
rcu_read_lock_sched include/linux/rcupdate.h:883 [inline]
pfn_valid include/linux/mmzone.h:1857 [inline]
__virt_addr_valid+0x1a5/0x540 arch/x86/mm/physaddr.c:65
kasan_addr_to_slab+0x9/0xc0 mm/kasan/common.c:36
__kasan_record_aux_stack+0xf/0xc0 mm/kasan/generic.c:471
irq_work_queue_on+0x10f/0x260 kernel/irq_work.c:140
rcu_read_unlock_special+0x3c9/0x510 kernel/rcu/tree_plugin.h:678
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
trace_call_bpf+0x5bb/0x6b0 kernel/trace/bpf_trace.c:137
perf_trace_run_bpf_submit+0x79/0x1c0 kernel/events/core.c:10027
perf_trace_preemptirq_template+0x268/0x320 include/trace/events/preemptirq.h:14
trace_irq_enable_rcuidle+0xd3/0x140 include/trace/events/preemptirq.h:40
trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 a2 7c 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc900001e0ae0 EFLAGS: 00000206
RAX: dae1ee0b075c3300 RBX: 1ffff9200003c164 RCX: dae1ee0b075c3300
RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: ffffffff8adf5de0
RBP: ffffc900001e0bd0 R08: ffffffff90b1025f R09: 1ffffffff216204b
R10: dffffc0000000000 R11: fffffbfff216204c R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8f3bb00 R15: 0000000000000002
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
ieee80211_iterate_active_interfaces_atomic+0x156/0x170 net/mac80211/util.c:826
mac80211_hwsim_beacon+0xb7/0x1b0 drivers/net/wireless/mac80211_hwsim.c:2147
__run_hrtimer kernel/time/hrtimer.c:1751 [inline]
__hrtimer_run_queues+0x522/0xc90 kernel/time/hrtimer.c:1815
hrtimer_run_softirq+0x173/0x290 kernel/time/hrtimer.c:1832
handle_softirqs+0x291/0x910 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:alloc_fd+0x140/0x640 fs/file.c:501
Code: 38 84 c0 0f 85 89 01 00 00 48 8d 85 00 01 00 00 44 8b 20 8b 44 24 1c 44 39 e0 44 0f 47 e0 4c 89 f0 48 c1 e8 03 42 0f b6 04 38 <84> c0 0f 85 86 01 00 00 45 8b 3e 44 89 e7 44 89 fe e8 4a 0e 99 ff
RSP: 0018:ffffc9000373fe38 EFLAGS: 00000a02
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000080000
RDX: ffffc9000f3e3000 RSI: 0000000000002786 RDI: 0000000000002787
RBP: ffff8880797712c0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff520006e7fb8 R12: 000000000000000a
R13: ffff888079771318 R14: ffff88803a93ad80 R15: dffffc0000000000
sock_map_fd net/socket.c:485 [inline]
__sys_socket+0x10d/0x190 net/socket.c:1679
__do_sys_socket net/socket.c:1684 [inline]
__se_sys_socket net/socket.c:1682 [inline]
__x64_sys_socket+0x76/0x80 net/socket.c:1682
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa86539e019
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa8635f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007fa865625fa0 RCX: 00007fa86539e019
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000010
RBP: 00007fa86543500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa865626038 R14: 00007fa865625fa0 R15: 00007ffdd0d42188
rcu: rcu_preempt kthread starved for 10500 jiffies! g135717 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:26928 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5246 [inline]
__schedule+0x107f/0x4030 kernel/sched/core.c:6563
schedule+0xb9/0x180 kernel/sched/core.c:6639
schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168
rcu_gp_fqs_loop+0x303/0x1350 kernel/rcu/tree.c:1706
rcu_gp_kthread+0x99/0x3b0 kernel/rcu/tree.c:1905
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 22314 Comm: syz.2.5507 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
RIP: 0010:kvm_wait+0x159/0x1b0 arch/x86/kernel/kvm.c:1064
Code: 89 df 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 4b 0f b6 1f e8 87 0f 50 00 44 38 e3 75 10 66 90 0f 00 2d c9 f3 50 09 fb f4 16 ff ff ff fb e9 10 ff ff ff e8 67 94 f7 08 89 f9 80 e1 07 38
RSP: 0018:ffffc9000364fba0 EFLAGS: 00000246
RAX: 9f263bd18a9e3500 RBX: 0000000000000003 RCX: 9f263bd18a9e3500
RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: ffffffff8adf5de0
RBP: ffffc9000364fc50 R08: ffffffff90b1025f R09: 1ffffffff216204b
R10: dffffc0000000000 R11: fffffbfff216204c R12: 0000000000000003
R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffff920006c9f74
FS: 00007fa8635d56c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000053b7c000 CR4: 00000000003506f0
DR0: fffffffffffffffc DR1: 00002000000000c0 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
pv_wait arch/x86/include/asm/paravirt.h:603 [inline]
pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
__pv_queued_spin_lock_slowpath+0x60f/0x9c0 kernel/locking/qspinlock.c:511
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline]
queued_spin_lock_slowpath+0x43/0x50 arch/x86/include/asm/qspinlock.h:51
queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
do_raw_spin_lock+0x265/0x2f0 kernel/locking/spinlock_debug.c:115
spin_lock include/linux/spinlock.h:351 [inline]
alloc_fd+0x62/0x640 fs/file.c:494
sock_map_fd net/socket.c:485 [inline]
__sys_socket+0x10d/0x190 net/socket.c:1679
__do_sys_socket net/socket.c:1684 [inline]
__se_sys_socket net/socket.c:1682 [inline]
__x64_sys_socket+0x76/0x80 net/socket.c:1682
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa86539e019
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa8635d5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007fa865626090 RCX: 00007fa86539e019
RDX: 0000000000000010 RSI: 0000000000000002 RDI: 0000000000000010
RBP: 00007fa86543500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa865626128 R14: 00007fa865626090 R15: 00007ffdd0d42188