watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz.2.70:598]
Modules linked in:
CPU: 0 PID: 598 Comm: syz.2.70 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:native_restore_fl arch/x86/include/asm/irqflags.h:41 [inline]
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline]
RIP: 0010:kvm_wait+0xce/0x130 arch/x86/kernel/kvm.c:926
Code: 38 f0 75 26 41 f7 c4 00 02 00 00 75 0f 0f 1f 44 00 00 0f 00 2d 33 1e b8 03 f4 eb 0e 0f 1f 44 00 00 0f 00 2d 24 1e b8 03 fb f4 <4c> 89 64 24 18 ff 74 24 18 9d 48 c7 44 24 20 0e 36 e0 45 4b c7 04
RSP: 0018:ffffc90000007ae0 EFLAGS: 00000246
RAX: 0000000000000003 RBX: ffff88811c220088 RCX: ffffffff814beb8a
RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffff88811c220088
RBP: ffffc90000007b90 R08: ffff88811c220088 R09: 1ffff11023844011
R10: dffffc0000000000 R11: ffffed1023844012 R12: 0000000000000246
R13: 1ffff11023844011 R14: dffffc0000000000 R15: 1ffff92000000f60
FS:  000055556ea49500(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000010000 CR3: 000000011cc99000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 pv_wait arch/x86/include/asm/paravirt.h:564 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x714/0xb70 kernel/locking/qspinlock.c:508
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:554 [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:184 [inline]
 __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_lock+0xe4/0xf0 kernel/locking/spinlock.c:151
 spin_lock include/linux/spinlock.h:355 [inline]
 tcp_write_timer+0x24/0x1d0 net/ipv4/tcp_timer.c:673
 call_timer_fn+0x38/0x290 kernel/time/timer.c:1450
 expire_timers kernel/time/timer.c:1495 [inline]
 __run_timers+0x650/0x9e0 kernel/time/timer.c:1789
 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1802
 __do_softirq+0x255/0x563 kernel/softirq.c:309
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0x60/0x80 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:405 [inline]
 __irq_exit_rcu+0x128/0x150 kernel/softirq.c:435
 irq_exit_rcu+0x9/0x10 kernel/softirq.c:447
 sysvec_apic_timer_interrupt+0xbf/0xe0 arch/x86/kernel/apic/apic.c:1106
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635
RIP: 0010:__sanitizer_cov_trace_pc+0x5c/0x60 kernel/kcov.c:207
Code: b8 0a 00 00 83 fa 02 75 21 48 8b 91 c0 0a 00 00 48 8b 32 48 8d 7e 01 8b 89 bc 0a 00 00 48 39 cf 73 08 48 89 44 f2 08 48 89 3a <5d> c3 66 90 55 48 89 e5 48 8b 45 08 65 48 8b 15 20 ba 9d 7e 65 8b
RSP: 0018:ffffc90000e677d0 EFLAGS: 00000293
RAX: ffffffff815a2ebc RBX: 0000000000000000 RCX: ffff88811b1e3b40
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000e677d0 R08: ffff8881f7157647 R09: 1ffff1103ee2aec8
R10: dffffc0000000000 R11: ffffed103ee2aec9 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff920001ccf00
 csd_lock_wait kernel/smp.c:229 [inline]
 smp_call_function_single+0x21c/0x490 kernel/smp.c:517
 smp_call_function_many_cond+0x90a/0xa00 kernel/smp.c:653
 smp_call_function_many kernel/smp.c:716 [inline]
 smp_call_function kernel/smp.c:738 [inline]
 on_each_cpu+0xab/0x180 kernel/smp.c:837
 text_poke_sync arch/x86/kernel/alternative.c:1568 [inline]
 text_poke_bp_batch+0x1cb/0x5f0 arch/x86/kernel/alternative.c:1768
 text_poke_flush arch/x86/kernel/alternative.c:1959 [inline]
 text_poke_finish+0x1a/0x30 arch/x86/kernel/alternative.c:1966
 arch_jump_label_transform_apply+0x15/0x30 arch/x86/kernel/jump_label.c:126
 __jump_label_update+0x37c/0x3a0 kernel/jump_label.c:459
 jump_label_update+0x34c/0x3e0 kernel/jump_label.c:825
 static_key_disable_cpuslocked+0xc5/0x1a0 kernel/jump_label.c:207
 static_key_disable+0x1a/0x30 kernel/jump_label.c:215
 tracepoint_remove_func kernel/tracepoint.c:438 [inline]
 tracepoint_probe_unregister+0x6e4/0x990 kernel/tracepoint.c:572
 bpf_probe_unregister+0x61/0x70 kernel/trace/bpf_trace.c:2135
 bpf_raw_tp_link_release+0x63/0x90 kernel/bpf/syscall.c:2762
 bpf_link_free kernel/bpf/syscall.c:2351 [inline]
 bpf_link_put+0x1f6/0x280 kernel/bpf/syscall.c:2377
 bpf_link_release+0x3b/0x40 kernel/bpf/syscall.c:2385
 __fput+0x2fb/0x770 fs/file_table.c:281
 ____fput+0x15/0x20 fs/file_table.c:314
 task_work_run+0x127/0x190 kernel/task_work.c:189
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop+0xcb/0xe0 kernel/entry/common.c:172
 exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:199
 syscall_exit_to_user_mode+0x1d/0x40 kernel/entry/common.c:274
 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f583814d079
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:00007fff17b540b8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fff17b541a0 RCX: 00007f583814d079
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000000c480 R08: 0000000000000001 R09: 0000000000000000
R10: 00007f5837fb3000 R11: 0000000000000246 R12: 00007fff17b541e0
R13: 00007f5838378fac R14: 000000000000c4cc R15: 00007f5838378fa0
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 402 Comm: syz-execprog Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:native_halt arch/x86/include/asm/irqflags.h:66 [inline]
RIP: 0010:halt arch/x86/include/asm/irqflags.h:112 [inline]
RIP: 0010:kvm_wait+0xbe/0x130 arch/x86/kernel/kvm.c:921
Code: c1 e8 03 42 0f b6 04 30 84 c0 75 6d 0f b6 07 40 38 f0 75 26 41 f7 c4 00 02 00 00 75 0f 0f 1f 44 00 00 0f 00 2d 33 1e b8 03 f4 <eb> 0e 0f 1f 44 00 00 0f 00 2d 24 1e b8 03 fb f4 4c 89 64 24 18 ff
RSP: 0018:ffffc9000016fc40 EFLAGS: 00000046
RAX: 0000000000000003 RBX: ffff8881f7147840 RCX: ffffffff814beb8a
RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffff8881f7147840
RBP: ffffc9000016fcf0 R08: ffff8881f7147840 R09: 1ffff1103ee28f08
R10: dffffc0000000000 R11: ffffed103ee28f09 R12: 0000000000000046
R13: 1ffff1103ee28f08 R14: dffffc0000000000 R15: 1ffff9200002df8c
FS:  00001a3ee4d49890(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5838003140 CR3: 000000012647a000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 pv_wait arch/x86/include/asm/paravirt.h:564 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x714/0xb70 kernel/locking/qspinlock.c:508
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:554 [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_flags include/linux/spinlock.h:196 [inline]
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:119 [inline]
 _raw_spin_lock_irqsave+0x120/0x130 kernel/locking/spinlock.c:159
 lock_timer_base+0x127/0x270 kernel/time/timer.c:952
 __mod_timer+0x109/0xb50 kernel/time/timer.c:1025
 add_timer+0x68/0x80 kernel/time/timer.c:1165
 __queue_delayed_work+0x173/0x200 kernel/workqueue.c:1683
 queue_delayed_work_on+0xf2/0x140 kernel/workqueue.c:1708
 queue_delayed_work include/linux/workqueue.h:530 [inline]
 schedule_delayed_work include/linux/workqueue.h:634 [inline]
 kvfree_call_rcu+0x423/0x650 kernel/rcu/tree.c:3568
 trie_delete_elem+0x57a/0x710 kernel/bpf/lpm_trie.c:-1
 bpf_prog_2c29ac5cdc6b1842+0x3a/0xfe8
 bpf_dispatcher_nop_func include/linux/bpf.h:669 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2061 [inline]
 bpf_trace_run3+0xda/0x280 kernel/trace/bpf_trace.c:2099
 __bpf_trace_timer_start+0x2b/0x40 include/trace/events/timer.h:52
 trace_timer_start include/trace/events/timer.h:52 [inline]
 enqueue_timer+0x337/0x480 kernel/time/timer.c:592
 __mod_timer+0x7cb/0xb50 kernel/time/timer.c:-1
 mod_timer+0x1f/0x30 kernel/time/timer.c:1119
 sk_reset_timer+0x22/0xb0 net/core/sock.c:3011
 tcp_send_delayed_ack+0x30a/0x400 net/ipv4/tcp_output.c:3979
 __tcp_ack_snd_check+0x420/0x8f0 net/ipv4/tcp_input.c:5543
 tcp_rcv_established+0x11d9/0x19f0 net/ipv4/tcp_input.c:5973
 tcp_v4_do_rcv+0x4c1/0x7c0 net/ipv4/tcp_ipv4.c:1698
 tcp_v4_rcv+0x21b3/0x2720 net/ipv4/tcp_ipv4.c:2094
 ip_protocol_deliver_rcu+0x2f0/0x640 net/ipv4/ip_input.c:204
 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline]
 NF_HOOK include/linux/netfilter.h:299 [inline]
 ip_local_deliver+0x2e2/0x570 net/ipv4/ip_input.c:252
 dst_input include/net/dst.h:461 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:436 [inline]
 NF_HOOK include/linux/netfilter.h:299 [inline]
 ip_rcv+0x156/0x290 net/ipv4/ip_input.c:547
 __netif_receive_skb_one_core net/core/dev.c:5415 [inline]
 __netif_receive_skb+0xc8/0x280 net/core/dev.c:5529
 process_backlog+0x368/0x600 net/core/dev.c:6436
 napi_poll net/core/dev.c:6887 [inline]
 net_rx_action+0x44d/0xe00 net/core/dev.c:6957
 __do_softirq+0x255/0x563 kernel/softirq.c:309
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0x60/0x80 arch/x86/kernel/irq_64.c:77
 do_softirq+0xb0/0xf0 kernel/softirq.c:358
 __local_bh_enable_ip+0x70/0x80 kernel/softirq.c:194
 local_bh_enable+0x1f/0x30 include/linux/bottom_half.h:32
 rcu_read_unlock_bh include/linux/rcupdate.h:807 [inline]
 ip_finish_output2+0xaed/0xee0 net/ipv4/ip_output.c:238
 __ip_finish_output+0x3fb/0x720 net/ipv4/ip_output.c:-1
 ip_finish_output+0x33/0x1f0 net/ipv4/ip_output.c:325
 NF_HOOK_COND include/linux/netfilter.h:288 [inline]
 ip_output+0x1e5/0x390 net/ipv4/ip_output.c:439
 dst_output include/net/dst.h:451 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 __ip_queue_xmit+0x1076/0x1c70 net/ipv4/ip_output.c:541
 ip_queue_xmit+0x4d/0x70 net/ipv4/ip_output.c:555
 __tcp_transmit_skb+0x1c2b/0x3300 net/ipv4/tcp_output.c:1403
 tcp_transmit_skb net/ipv4/tcp_output.c:1421 [inline]
 tcp_write_xmit+0x15a1/0x5c10 net/ipv4/tcp_output.c:2714
 __tcp_push_pending_frames+0x9c/0x300 net/ipv4/tcp_output.c:2895
 tcp_push+0x464/0x610 net/ipv4/tcp.c:736
 tcp_sendmsg_locked+0x2fc5/0x3500 net/ipv4/tcp.c:1417
 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1447
 inet6_sendmsg+0xa5/0xc0 net/ipv6/af_inet6.c:663
 sock_sendmsg_nosec net/socket.c:652 [inline]
 __sock_sendmsg net/socket.c:664 [inline]
 sock_write_iter+0x2a6/0x3a0 net/socket.c:1018
 call_write_iter include/linux/fs.h:2066 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x758/0xdc0 fs/read_write.c:605
 ksys_write+0x149/0x250 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:667
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x40d3ce
Code: ff 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 49 89 f2 48 89 fa 48 89 ce 48 89 df 0f 05 <48> 3d 01 f0 ff ff 76 15 48 f7 d8 48 89 c1 48 c7 c0 ff ff ff ff 48
RSP: 002b:00001a3ee68d13b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 000000000040d3ce
RDX: 0000000000000560 RSI: 00001a3ee7f70fa0 RDI: 0000000000000006
RBP: 00001a3ee68d13f8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 00001a3ee68d1528
R13: 0000000000000550 R14: 00001a3ee68b4780 R15: 0000000000000542