watchdog: BUG: soft lockup - CPU#1 stuck for 246s! [syz.7.3380:13384] Modules linked in: CPU: 1 PID: 13384 Comm: syz.7.3380 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:csd_lock_wait kernel/smp.c:453 [inline] RIP: 0010:smp_call_function_single+0x1f5/0x470 kernel/smp.c:787 Code: 48 44 89 f6 83 e6 01 31 ff e8 37 77 09 00 41 83 e6 01 49 bc 00 00 00 00 00 fc ff df 75 0a e8 02 73 09 00 e9 a9 00 00 00 f3 90 44 24 48 01 00 00 00 0f 84 94 00 00 00 e8 e8 72 09 00 eb e9 e8 RSP: 0018:ffffc9000d9a7580 EFLAGS: 00000246 RAX: ffffffff8166b798 RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc90002132000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc9000d9a7668 R08: dffffc0000000000 R09: fffff52001b34e89 R10: 0000000000000000 R11: ffffffff81343830 R12: dffffc0000000000 R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff92001b34eb4 FS: 00007f934f6b76c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff43ecadf8 CR3: 00000001527a1000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rcu_barrier+0x32e/0x600 kernel/rcu/tree.c:4126 netdev_run_todo+0x10a/0xc00 net/core/dev.c:10447 rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:147 sit_exit_batch_net+0x60f/0x650 net/ipv6/sit.c:1889 ops_exit_list net/core/net_namespace.c:177 [inline] setup_net+0x8cb/0xcb0 net/core/net_namespace.c:358 copy_net_ns+0x355/0x5c0 net/core/net_namespace.c:481 create_new_namespaces+0x3a2/0x660 kernel/nsproxy.c:110 copy_namespaces+0x1d1/0x220 kernel/nsproxy.c:178 copy_process+0x12e0/0x34a0 kernel/fork.c:2478 kernel_clone+0x23a/0x810 kernel/fork.c:2890 __do_sys_clone kernel/fork.c:3033 [inline] __se_sys_clone kernel/fork.c:3017 [inline] __x64_sys_clone+0x168/0x1b0 kernel/fork.c:3017 x64_sys_call+0x990/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:57 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f934e78f749 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:00007f934f6b6fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f934e9e5fa0 RCX: 00007f934e78f749 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000044208400 RBP: 00007f934e813f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007f934e9e6038 R14: 00007f934e9e5fa0 R15: 00007ffd53b39ec8 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 13422 Comm: syz.9.3390 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+0xcc/0x140 arch/x86/kernel/kvm.c:1058 Code: 20 f6 44 24 21 02 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 a6 66 90 0f 00 2d 55 96 13 04 f4 9a fa 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 3f 0f b6 07 RSP: 0018:ffffc90000d96b40 EFLAGS: 00000046 RAX: 0000000000000003 RBX: ffff88812fb3fd40 RCX: ffffffff84f48de2 RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff88812fb3fd40 RBP: ffffc90000d96bd0 R08: dffffc0000000000 R09: ffffed1025f67fa9 R10: ffffed1025f67fa9 R11: 1ffff11025f67fa8 R12: 1ffff1103ee00001 R13: ffff8881f7038cf4 R14: dffffc0000000000 R15: 1ffff920001b2d68 FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000100000000 CR3: 0000000006e0f000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300 DR3: 0000200000000300 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+0x690/0xc40 kernel/locking/qspinlock.c:511 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline] queued_spin_lock_slowpath+0x47/0x50 arch/x86/include/asm/qspinlock.h:51 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock include/linux/spinlock.h:187 [inline] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline] _raw_spin_lock_irqsave+0x108/0x110 kernel/locking/spinlock.c:162 queue_stack_map_push_elem+0x14d/0x530 kernel/bpf/queue_stack_maps.c:214 bpf_prog_b0e2dcbfde9dbc23+0x3a/0x3e bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline] __bpf_prog_run include/linux/filter.h:603 [inline] bpf_prog_run include/linux/filter.h:610 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2283 [inline] bpf_trace_run2+0xff/0x250 kernel/trace/bpf_trace.c:2322 __bpf_trace_contention_end+0xb/0x10 include/trace/events/lock.h:122 trace_contention_end include/trace/events/lock.h:122 [inline] __pv_queued_spin_lock_slowpath+0xbff/0xc40 kernel/locking/qspinlock.c:560 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline] queued_spin_lock_slowpath+0x47/0x50 arch/x86/include/asm/qspinlock.h:51 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock include/linux/spinlock.h:187 [inline] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline] _raw_spin_lock_irqsave+0x108/0x110 kernel/locking/spinlock.c:162 queue_stack_map_push_elem+0x14d/0x530 kernel/bpf/queue_stack_maps.c:214 bpf_prog_b0e2dcbfde9dbc23+0x3a/0x3e bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline] __bpf_prog_run include/linux/filter.h:603 [inline] bpf_prog_run include/linux/filter.h:610 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2283 [inline] bpf_trace_run3+0x113/0x270 kernel/trace/bpf_trace.c:2323 __bpf_trace_rss_stat+0x98/0xc0 include/trace/events/kmem.h:463 trace_rss_stat include/trace/events/kmem.h:463 [inline] mm_trace_rss_stat mm/memory.c:174 [inline] add_mm_counter include/linux/mm.h:2456 [inline] add_mm_rss_vec+0x1bc/0x220 mm/memory.c:526 zap_pte_range mm/memory.c:1531 [inline] zap_pmd_range mm/memory.c:1596 [inline] zap_pud_range mm/memory.c:1625 [inline] zap_p4d_range mm/memory.c:1646 [inline] unmap_page_range+0x208a/0x2310 mm/memory.c:1667 unmap_single_vma mm/memory.c:1713 [inline] unmap_vmas+0x31c/0x430 mm/memory.c:1753 exit_mmap+0x263/0xbb0 mm/mmap.c:3371 __mmput+0x93/0x360 kernel/fork.c:1309 mmput+0x4b/0x150 kernel/fork.c:1333 exit_mm kernel/exit.c:568 [inline] do_exit+0x981/0x2650 kernel/exit.c:873 do_group_exit+0x210/0x2d0 kernel/exit.c:1028 get_signal+0x13b5/0x1520 kernel/signal.c:2889 arch_do_signal_or_restart+0xb0/0x1030 arch/x86/kernel/signal.c:871 exit_to_user_mode_loop+0x7a/0xb0 kernel/entry/common.c:174 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f336438f749 Code: Unable to access opcode bytes at 0x7f336438f71f. RSP: 002b:00007f33652980e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 00007f33645e5fa8 RCX: 00007f336438f749 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f33645e5fac RBP: 00007f33645e5fa0 R08: 00059af28b8059a6 R09: 0000000000000000 R10: 000000000000000e R11: 0000000000000246 R12: 0000000000000000 R13: 00007f33645e6038 R14: 00007ffedd2af690 R15: 00007ffedd2af778