watchdog: BUG: soft lockup - CPU#1 stuck for 246s! [syz.3.838:3562]
Modules linked in:
CPU: 1 PID: 3562 Comm: syz.3.838 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_many_cond+0x872/0x960 kernel/smp.c:998
Code: 41 8b 1f 89 de 83 e6 01 31 ff e8 99 65 09 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 0a e8 65 61 09 00 e9 38 ff ff ff f3 90 <41> 0f b6 44 1d 00 84 c0 75 14 41 f7 07 01 00 00 00 0f 84 1a ff ff
RSP: 0000:ffffc90000c377e0 EFLAGS: 00000293
RAX: ffffffff8166c87e RBX: dffffc0000000000 RCX: ffff88811dff1440
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000c37920 R08: dffffc0000000000 R09: ffffed1022cae1a5
R10: ffffed1022cae1a5 R11: 1ffff11022cae1a4 R12: 1ffff1103ee27218
R13: 1ffff1103ee07ae1 R14: 0000000000000000 R15: ffff8881f703d708
FS:  000055557c31b500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2179be2000 CR3: 0000000132834000 CR4: 00000000003506a0
DR0: 00000000000000fd DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x43/0x80 kernel/smp.c:1165
 native_flush_tlb_multi+0x144/0x210 arch/x86/mm/tlb.c:-1
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:87 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:970 [inline]
 flush_tlb_mm_range+0x36a/0x470 arch/x86/mm/tlb.c:1058
 flush_tlb_page arch/x86/include/asm/tlbflush.h:241 [inline]
 ptep_clear_flush+0x111/0x150 mm/pgtable-generic.c:99
 wp_page_copy+0xca3/0x15b0 mm/memory.c:3278
 do_wp_page+0x9f2/0xfc0 mm/memory.c:-1
 handle_pte_fault mm/memory.c:5189 [inline]
 __handle_mm_fault mm/memory.c:5313 [inline]
 handle_mm_fault+0x10e4/0x2640 mm/memory.c:5453
 do_user_addr_fault+0x905/0x1050 arch/x86/mm/fault.c:1323
 handle_page_fault arch/x86/mm/fault.c:1466 [inline]
 exc_page_fault+0x51/0xb0 arch/x86/mm/fault.c:1522
 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f21798612e8
Code: 80 3d 3b 0d 38 00 00 89 7c 24 0c 88 54 24 10 48 89 74 24 28 0f 85 c8 09 00 00 80 3d 06 44 eb 00 00 48 89 f5 41 89 d4 41 89 cd <c6> 05 11 0d 38 00 01 0f 85 23 04 00 00 80 3d d4 43 eb 00 00 0f 85
RSP: 002b:00007ffe2d617f60 EFLAGS: 00010202
RAX: 00007f2179be6180 RBX: 000000000001dbc6 RCX: 0000000000000002
RDX: 0000000000000003 RSI: 00007f2179be6218 RDI: 0000000000000018
RBP: 00007f2179be6218 R08: 0000000000000000 R09: 0000000000000002
R10: 00007ffe2d618110 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000002 R14: 000000000001dbf8 R15: 00007ffe2d618130
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3563 Comm: syz.3.838 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 95 96 13 04 f4 <eb> 9a fa 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 3f 0f b6 07
RSP: 0018:ffffc90000c46d40 EFLAGS: 00000046
RAX: 0000000000000003 RBX: ffffc90000ce9080 RCX: ffffffff84f48de2
RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffffc90000ce9080
RBP: ffffc90000c46dd0 R08: dffffc0000000000 R09: fffff5200019d211
R10: fffff5200019d211 R11: 1ffff9200019d210 R12: 1ffff1103ee00001
R13: ffff8881f7038cf4 R14: dffffc0000000000 R15: 1ffff92000188da8
FS:  00007f217a89f6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000005294a5008 CR3: 0000000132834000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 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
 __bpf_ringbuf_reserve+0x19c/0x500 kernel/bpf/ringbuf.c:413
 ____bpf_ringbuf_output kernel/bpf/ringbuf.c:539 [inline]
 bpf_ringbuf_output+0x68/0x1e0 kernel/bpf/ringbuf.c:529
 bpf_prog_7bf929eaf7943e2f+0x42/0x46
 bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline]
 __bpf_prog_run include/linux/filter.h:596 [inline]
 bpf_prog_run include/linux/filter.h:610 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2283 [inline]
 bpf_trace_run2+0x1a7/0x250 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
 __bpf_ringbuf_reserve+0x19c/0x500 kernel/bpf/ringbuf.c:413
 ____bpf_ringbuf_output kernel/bpf/ringbuf.c:539 [inline]
 bpf_ringbuf_output+0x68/0x1e0 kernel/bpf/ringbuf.c:529
 bpf_prog_7bf929eaf7943e2f+0x42/0x46
 bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline]
 __bpf_prog_run include/linux/filter.h:596 [inline]
 bpf_prog_run include/linux/filter.h:610 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2283 [inline]
 bpf_trace_run10+0x21e/0x2d0 kernel/trace/bpf_trace.c:2330
 __bpf_trace_percpu_alloc_percpu+0x4f/0x60 include/trace/events/percpu.h:11
 trace_percpu_alloc_percpu include/trace/events/percpu.h:11 [inline]
 pcpu_alloc+0x1548/0x1690 mm/percpu.c:1887
 __alloc_percpu+0x24/0x30 mm/percpu.c:1950
 alloc_vfsmnt+0x106/0x4a0 fs/namespace.c:223
 clone_mnt+0x6d/0xd10 fs/namespace.c:1109
 copy_tree+0x3e9/0x7e0 fs/namespace.c:1928
 copy_mnt_ns+0x17d/0x8f0 fs/namespace.c:3518
 create_new_namespaces+0xcf/0x660 kernel/nsproxy.c:78
 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: 0033:0x7f217998f749
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:00007f217a89efe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f2179be5fa0 RCX: 00007f217998f749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000041064400
RBP: 00007f2179a13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f2179be6038 R14: 00007f2179be5fa0 R15: 00007ffe2d617eb8
 </TASK>