worker_thread+0xa59/0x1200 kernel/workqueue.c:2472
kthread+0x411/0x500 kernel/kthread.c:337
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
watchdog: BUG: soft lockup - CPU#0 stuck for 225s! [kworker/0:0:6]
Modules linked in:
CPU: 0 PID: 6 Comm: kworker/0:0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: events pcpu_balance_workfn
RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline]
RIP: 0010:smp_call_function_many_cond+0x8e3/0xa10 kernel/smp.c:969
Code: 84 c0 0f 85 9d 00 00 00 41 8b 1f 89 de 83 e6 01 31 ff e8 e0 4e 0a 00 83 e3 01 48 8b 5c 24 10 75 07 e8 21 4b 0a 00 eb 42 f3 90 <48> b8 00 00 00 00 00 fc ff df 41 0f b6 44 05 00 84 c0 75 10 41 f7
RSP: 0018:ffffc90000067b00 EFLAGS: 00000293
RAX: ffffffff815f7df5 RBX: ffff8881f7038e80 RCX: ffff8881002662c0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000067c18 R08: ffffc90000067a4f R09: ffffc90000067a40
R10: dffffc0000000000 R11: fffff5200000cf4a R12: 1ffff1103ee071d0
R13: 1ffff1103ee2784d R14: 0000000000000001 R15: ffff8881f713c268
FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000006e4000 CR3: 000000012a2c0000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
on_each_cpu_cond_mask+0x43/0x80 kernel/smp.c:1134
on_each_cpu include/linux/smp.h:71 [inline]
flush_tlb_kernel_range+0x43/0x240 arch/x86/mm/tlb.c:1074
pcpu_post_unmap_tlb_flush mm/percpu-vm.c:188 [inline]
pcpu_reclaim_populated mm/percpu.c:2211 [inline]
pcpu_balance_workfn+0x544/0x1180 mm/percpu.c:2247
process_one_work+0x6be/0xba0 kernel/workqueue.c:2325
worker_thread+0xa59/0x1200 kernel/workqueue.c:2472
kthread+0x411/0x500 kernel/kthread.c:337
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 435 Comm: syz.1.24 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:native_halt arch/x86/include/asm/irqflags.h:57 [inline]
RIP: 0010:halt arch/x86/include/asm/irqflags.h:98 [inline]
RIP: 0010:kvm_wait+0xdf/0x150 arch/x86/kernel/kvm.c:912
Code: 43 c6 44 37 04 f8 75 24 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 48 0f b6 07 40 38 f0 75 93 66 90 0f 00 2d 92 21 d6 03 f4 87 fa 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 3f 0f b6 07
RSP: 0018:ffffc900011175a0 EFLAGS: 00000046
RAX: 0000000000000003 RBX: ffff8881002fd7ec RCX: ffffffff815004c9
RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffff8881002fd7ec
RBP: ffffc90001117630 R08: ffff8881002fd7ec R09: 1ffff1102005fafd
R10: dffffc0000000000 R11: ffffed102005fafe R12: 1ffff1103ee20001
R13: ffff8881f7138ad4 R14: dffffc0000000000 R15: 1ffff92000222eb4
FS: 00007f24af2c96c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e917ff8 CR3: 000000012bf63000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
pv_wait arch/x86/include/asm/paravirt.h:597 [inline]
pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
__pv_queued_spin_lock_slowpath+0x60f/0x9c0 kernel/locking/qspinlock.c:508
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline]
queued_spin_lock_slowpath+0x47/0x50 arch/x86/include/asm/qspinlock.h:51
queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
do_raw_spin_lock include/linux/spinlock.h:188 [inline]
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:129 [inline]
_raw_spin_lock_irq+0xe5/0xf0 kernel/locking/spinlock.c:170
get_wchan kernel/sched/core.c:2021 [inline]
perf_trace_sched_blocked_reason+0x24f/0x4b0 include/trace/events/sched.h:490
trace_sched_blocked_reason include/trace/events/sched.h:490 [inline]
try_to_wake_up+0xea1/0x1160 kernel/sched/core.c:4190
wake_up_process+0x10/0x20 kernel/sched/core.c:4348
swake_up_locked kernel/sched/swait.c:30 [inline]
swake_up_one+0x6a/0x150 kernel/sched/swait.c:53
__rcu_report_exp_rnp+0x1aa/0x1b0 kernel/rcu/tree_exp.h:201
rcu_report_exp_rnp kernel/rcu/tree_exp.h:223 [inline]
rcu_preempt_deferred_qs_irqrestore+0x6f4/0x9d0 kernel/rcu/tree_plugin.h:562
rcu_read_unlock_special+0xb2/0x420 kernel/rcu/tree_plugin.h:673
__rcu_read_unlock+0x5e/0xa0 kernel/rcu/tree_plugin.h:422
rcu_read_unlock include/linux/rcupdate.h:781 [inline]
bpf_percpu_hash_update+0x9d/0xd0 kernel/bpf/hashtab.c:2245
bpf_map_update_value+0x214/0x3e0 kernel/bpf/syscall.c:198
generic_map_update_batch+0x501/0x760 kernel/bpf/syscall.c:1404
bpf_map_do_batch+0x463/0x5f0 kernel/bpf/syscall.c:-1
__sys_bpf+0x65c/0x7d0 kernel/bpf/syscall.c:-1
__do_sys_bpf kernel/bpf/syscall.c:4737 [inline]
__se_sys_bpf kernel/bpf/syscall.c:4735 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:4735
x64_sys_call+0x4b9/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f24b086ceb9
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:00007f24af2c9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f24b0ae7fa0 RCX: 00007f24b086ceb9
RDX: 0000000000000038 RSI: 0000200000000340 RDI: 000000000000001a
RBP: 00007f24b08dac1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f24b0ae8038 R14: 00007f24b0ae7fa0 R15: 00007ffff426bca8