watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.6.3061:21089] Modules linked in: irq event stamp: 9013531 hardirqs last enabled at (9013530): [] irqentry_exit+0x59c/0x620 kernel/entry/common.c:219 hardirqs last disabled at (9013531): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (802): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (802): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (802): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (1441): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (1441): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (1441): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 21089 Comm: syz.6.3061 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:98 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:133 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:140 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:172 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:191 [inline] RIP: 0010:kasan_check_range+0x1b9/0x2c0 mm/kasan/generic.c:200 Code: 08 41 ff cd 75 ee 4d 89 cc 4d 29 dc 4d 29 f4 49 01 dc 4d 01 f3 49 8d 5c 24 07 4d 85 e4 49 0f 49 dc 48 83 e3 f8 49 29 dc 74 0e <41> 80 3b 00 75 7c 49 ff c3 49 ff cc 75 f2 5b 41 5c 41 5d 41 5e 41 RSP: 0018:ffffc90000007120 EFLAGS: 00000202 RAX: 1ffff1100b258a01 RBX: 0000000000000000 RCX: ffffffff8b10e91c RDX: 0000000000000001 RSI: 0000000000000088 RDI: ffffc90000007260 RBP: 0000000000000004 R08: ffffc900000072e7 R09: 1ffff92000000e5c R10: dffffc0000000000 R11: fffff52000000e5c R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000008 R15: 0000000000000000 FS: 00007f5c320456c0(0000) GS:ffff8881256f5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000100000002 CR3: 0000000077baa000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __asan_memset+0x22/0x50 mm/kasan/shadow.c:84 ieee80211_tx_prepare+0x5c/0x16e0 net/mac80211/tx.c:1219 ieee80211_tx+0x141/0x4b0 net/mac80211/tx.c:1949 __ieee80211_subif_start_xmit+0xd12/0x1660 net/mac80211/tx.c:4346 ieee80211_subif_start_xmit+0xf3/0x570 net/mac80211/tx.c:4542 __netdev_start_xmit include/linux/netdevice.h:5273 [inline] netdev_start_xmit include/linux/netdevice.h:5282 [inline] xmit_one net/core/dev.c:3866 [inline] dev_hard_start_xmit+0x2cd/0x7f0 net/core/dev.c:3882 __dev_queue_xmit+0x168f/0x3850 net/core/dev.c:4832 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x340/0x550 net/ipv6/ip6_output.c:247 NF_HOOK include/linux/netfilter.h:318 [inline] ndisc_send_skb+0xbaa/0x14e0 net/ipv6/ndisc.c:512 addrconf_rs_timer+0x395/0x6d0 net/ipv6/addrconf.c:4037 call_timer_fn+0x192/0x5a0 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__sanitizer_cov_trace_pc+0x45/0x70 kernel/kcov.c:222 Code: ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 6c 16 00 00 00 74 2c 8b 91 48 16 00 00 83 fa 02 75 21 48 8b 91 50 16 00 00 48 8b 32 <48> 8d 7e 01 8b 89 4c 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 RSP: 0018:ffffc9000adafba0 EFLAGS: 00000246 RAX: ffffffff81b829cd RBX: ffff888075915b80 RCX: ffff8880253b9e80 RDX: ffffc90015c5a000 RSI: 0000000000005e45 RDI: 000000007ffffffe RBP: ffff888075915ba8 R08: ffff888075915bab R09: 1ffff1100eb22b75 R10: dffffc0000000000 R11: ffffed100eb22b76 R12: ffffc9000489faa0 R13: ffff888075915ba8 R14: dffffc0000000000 R15: ffffc9000adafc80 __refcount_add include/linux/refcount.h:290 [inline] __refcount_inc include/linux/refcount.h:366 [inline] refcount_inc include/linux/refcount.h:383 [inline] get_task_struct include/linux/sched/task.h:116 [inline] futex_wake_mark+0x8d/0x1f0 kernel/futex/waitwake.c:138 futex_wake+0x39b/0x580 kernel/futex/waitwake.c:191 do_futex+0x395/0x420 kernel/futex/syscalls.c:135 __do_sys_futex kernel/futex/syscalls.c:207 [inline] __se_sys_futex+0x3a8/0x450 kernel/futex/syscalls.c:188 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5c3119aeb9 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:00007f5c320450e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007f5c31416188 RCX: 00007f5c3119aeb9 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f5c3141618c RBP: 00007f5c31416180 R08: 3fffffffffffffff R09: 0000000000000000 R10: 000000000000000d R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5c31416218 R14: 00007ffce6be7d90 R15: 00007ffce6be7e78 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5489 Comm: dhcpcd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xcea/0x1270 kernel/smp.c:877 Code: 89 ee 83 e6 01 31 ff e8 c4 db 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 6f d7 0b 00 eb 38 f3 90 42 0f b6 04 2b <84> c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 53 d7 0b 00 eb e4 44 RSP: 0018:ffffc9000392f600 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 1ffff110170c856d RCX: ffff88802f0b3d00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000392f740 R08: ffffffff8fef1a77 R09: 1ffffffff1fde34e R10: dffffc0000000000 R11: fffffbfff1fde34f R12: ffff8880b8642b68 R13: dffffc0000000000 R14: ffff8880b873bb00 R15: 0000000000000000 FS: 00007f17a4baf740(0000) GS:ffff8881257f5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f643f403d58 CR3: 000000002f00c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline] flush_tlb_multi arch/x86/mm/tlb.c:1382 [inline] flush_tlb_mm_range+0x5c3/0x10c0 arch/x86/mm/tlb.c:1472 tlb_flush arch/x86/include/asm/tlb.h:23 [inline] tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:506 [inline] tlb_flush_mmu+0x1af/0xa30 mm/mmu_gather.c:404 tlb_finish_mmu+0xf9/0x230 mm/mmu_gather.c:530 vms_clear_ptes+0x44d/0x570 mm/vma.c:1278 vms_complete_munmap_vmas+0x205/0x890 mm/vma.c:1320 do_vmi_align_munmap+0x3b7/0x4b0 mm/vma.c:1579 do_vmi_munmap+0x252/0x2d0 mm/vma.c:1627 __vm_munmap+0x22c/0x3d0 mm/vma.c:3247 __do_sys_munmap mm/mmap.c:1077 [inline] __se_sys_munmap mm/mmap.c:1074 [inline] __x64_sys_munmap+0x60/0x70 mm/mmap.c:1074 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f17a4cb0097 Code: 73 01 c3 48 8b 0d 61 2d 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 0b 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 31 2d 0d 00 f7 d8 64 89 01 48 RSP: 002b:00007fff6b2548c8 EFLAGS: 00000202 ORIG_RAX: 000000000000000b RAX: ffffffffffffffda RBX: 0000000000009000 RCX: 00007f17a4cb0097 RDX: 00007f17a4c9ddd0 RSI: 0000000000009000 RDI: 00007f17a4ae5000 RBP: 00007f17a4ae5000 R08: 0000000000005263 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000202 R12: 0000000000000000 R13: 00007fff6b254900 R14: 0000000000000001 R15: 00007f17a4c9ddd0