watchdog: BUG: soft lockup - CPU#1 stuck for 245s! [syz.2.526:1620]
Modules linked in:
CPU: 1 PID: 1620 Comm: syz.2.526 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline]
RIP: 0010:smp_call_function_many_cond+0x8c3/0x9f0 kernel/smp.c:969
Code: 84 c0 0f 85 9d 00 00 00 41 8b 1f 89 de 83 e6 01 31 ff e8 90 37 0a 00 83 e3 01 48 8b 5c 24 10 75 07 e8 d1 33 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:ffffc90000b8f220 EFLAGS: 00000246
RAX: ffffffff815e8b65 RBX: ffff8881f7138e80 RCX: 0000000000080000
RDX: ffffc9000170c000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90000b8f328 R08: dffffc0000000000 R09: ffffc90000b8f160
R10: fffff52000171e2e R11: 1ffff92000171e2c R12: 1ffff1103ee271d0
R13: 1ffff1103ee07af9 R14: 0000000000000000 R15: ffff8881f703d7c8
FS:  00007fa811db76c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e623ffc CR3: 000000012bc7e000 CR4: 00000000003506a0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x43/0x80 kernel/smp.c:1135
 on_each_cpu include/linux/smp.h:71 [inline]
 flush_tlb_kernel_range+0x43/0x240 arch/x86/mm/tlb.c:1074
 __purge_vmap_area_lazy+0x1ad/0x1840 mm/vmalloc.c:1702
 _vm_unmap_aliases+0x2fd/0x380 mm/vmalloc.c:2126
 vm_unmap_aliases+0x19/0x20 mm/vmalloc.c:2149
 change_page_attr_set_clr+0x311/0xc10 arch/x86/mm/pat/set_memory.c:1740
 change_page_attr_clear arch/x86/mm/pat/set_memory.c:1797 [inline]
 set_memory_ro+0x89/0xd0 arch/x86/mm/pat/set_memory.c:1943
 bpf_jit_binary_lock_ro include/linux/filter.h:899 [inline]
 bpf_int_jit_compile+0xc493/0xcc60 arch/x86/net/bpf_jit_comp.c:2478
 bpf_prog_select_runtime+0x6f1/0x9f0 kernel/bpf/core.c:1934
 bpf_prog_load+0x106d/0x1550 kernel/bpf/syscall.c:2332
 __sys_bpf+0x4c3/0x730 kernel/bpf/syscall.c:4633
 __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: 0033:0x7fa81334efc9
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:00007fa811db7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fa8135a5fa0 RCX: 00007fa81334efc9
RDX: 0000000000000027 RSI: 0000200000000280 RDI: 0000000000000005
RBP: 00007fa8133d1f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa8135a6038 R14: 00007fa8135a5fa0 R15: 00007ffcc1792068
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 1614 Comm: syz.0.525 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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:912
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 85 91 d6 03 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:ffffc90000007820 EFLAGS: 00000046
RAX: 0000000000000003 RBX: ffff88810031306c RCX: ffffffff814f42b9
RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffff88810031306c
RBP: ffffc900000078b0 R08: dffffc0000000000 R09: ffffed102006260e
R10: ffffed102006260e R11: 1ffff1102006260d R12: 1ffff1103ee00001
R13: ffff8881f7038ad4 R14: dffffc0000000000 R15: 1ffff92000000f04
FS:  00007f73ec9c46c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2961e6 CR3: 000000012f2e0000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 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:187 [inline]
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:129 [inline]
 _raw_spin_lock_irq+0xd9/0xe0 kernel/locking/spinlock.c:170
 get_wchan kernel/sched/core.c:2021 [inline]
 perf_trace_sched_blocked_reason+0x243/0x4a0 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+0x60/0x120 kernel/sched/swait.c:30
 complete+0x5e/0xb0 kernel/sched/completion.c:36
 rcu_barrier_callback+0x47/0x50 kernel/rcu/tree.c:4033
 rcu_do_batch+0x51d/0xba0 kernel/rcu/tree.c:2523
 rcu_core+0x5e4/0xf80 kernel/rcu/tree.c:2763
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2776
 handle_softirqs+0x250/0x560 kernel/softirq.c:583
 __do_softirq kernel/softirq.c:621 [inline]
 invoke_softirq kernel/softirq.c:443 [inline]
 __irq_exit_rcu+0x52/0xf0 kernel/softirq.c:670
 irq_exit_rcu+0x9/0x10 kernel/softirq.c:682
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:schedule_debug kernel/sched/core.c:5743 [inline]
RIP: 0010:__schedule+0xfe/0x14c0 kernel/sched/core.c:6428
Code: 3e 4d 8d 77 20 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 61 a0 ff fc 4d 8b 36 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 <74> 08 4c 89 f7 e8 48 a0 ff fc 49 81 3e 9d 6e ac 57 0f 85 43 0c 00
RSP: 0018:ffffc90000b57440 EFLAGS: 00000246
RAX: 1ffff9200016a000 RBX: ffff8881f7000000 RCX: 56679c41bbce2d00
RDX: 0000000000400140 RSI: ffffffff856340e0 RDI: ffffffff856340a0
RBP: ffffc90000b57530 R08: ffffffff870bf008 R09: ffffffff870bf018
R10: ffffffff870bf003 R11: 1ffffffff0e17e00 R12: dffffc0000000000
R13: 0000000000000001 R14: ffffc90000b50000 R15: ffff888115c42780
 preempt_schedule_irq+0x9b/0x110 kernel/sched/core.c:6942
 irqentry_exit_cond_resched+0x29/0x30 kernel/entry/common.c:398
 irqentry_exit+0x37/0x40 kernel/entry/common.c:432
 sysvec_apic_timer_interrupt+0x64/0xc0 arch/x86/kernel/apic/apic.c:1108
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:mnt_add_count fs/namespace.c:169 [inline]
RIP: 0010:mntget+0x42/0x60 fs/namespace.c:1243
Code: ff 4c 8d 73 50 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 f7 e8 94 bc f0 ff 49 8b 06 65 ff 00 <eb> 05 e8 b7 3d b2 ff 48 89 d8 5b 41 5e 5d c3 66 2e 0f 1f 84 00 00
RSP: 0018:ffffc90000b576c0 EFLAGS: 00000206
RAX: 000000000003cc3c RBX: ffff8881001c61e0 RCX: dffffc0000000000
RDX: ffffc9000130b000 RSI: 0000000000000b46 RDI: 0000000000000b47
RBP: ffffc90000b576d0 R08: dffffc0000000000 R09: ffffed1023f37a10
R10: ffffed1023f37a10 R11: 1ffff11023f37a0f R12: ffffc90000b577a0
R13: ffff888111856aa0 R14: ffff8881001c6230 R15: dffffc0000000000
 __ns_get_path+0xda/0x470 fs/nsfs.c:75
 ns_get_path_cb fs/nsfs.c:118 [inline]
 ns_get_path+0x54/0x90 fs/nsfs.c:144
 proc_ns_get_link+0xf3/0x200 fs/proc/namespaces.c:61
 pick_link+0x6d4/0xe00 fs/namei.c:-1
 step_into+0xaec/0xd10 fs/namei.c:1832
 open_last_lookups fs/namei.c:3555 [inline]
 path_openat+0x1629/0x2f10 fs/namei.c:3739
 do_filp_open+0x1b3/0x3e0 fs/namei.c:3769
 do_sys_openat2+0x14c/0x7b0 fs/open.c:1234
 do_sys_open fs/open.c:1250 [inline]
 __do_sys_openat fs/open.c:1266 [inline]
 __se_sys_openat fs/open.c:1261 [inline]
 __x64_sys_openat+0x136/0x160 fs/open.c:1261
 x64_sys_call+0x219/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258
 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: 0033:0x7f73edf5a810
Code: 48 89 44 24 20 75 93 44 89 54 24 0c e8 69 95 02 00 44 8b 54 24 0c 89 da 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 38 44 89 c7 89 44 24 0c e8 bc 95 02 00 8b 44
RSP: 002b:00007f73ec9c3f10 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f73edf5a810
RDX: 0000000000000000 RSI: 00007f73ec9c3fa0 RDI: 00000000ffffff9c
RBP: 00007f73ec9c3fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007f73ee1b3038 R14: 00007f73ee1b2fa0 R15: 00007fff25dd8728
 </TASK>