watchdog: BUG: soft lockup - CPU#0 stuck for 121s! [syz.2.46:6125] Modules linked in: irq event stamp: 27721149 hardirqs last enabled at (27721148): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:310 hardirqs last disabled at (27721149): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050 softirqs last enabled at (27455032): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (27455032): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (27455032): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (27455037): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (27455037): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (27455037): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 6125 Comm: syz.2.46 Not tainted 6.15.0-syzkaller-ge41079f53e87 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:ieee80211_tasklet_handler+0x0/0x20 net/mac80211/main.c:457 Code: 89 f3 e8 83 b7 ec f6 48 81 c3 a0 f8 ff ff 48 89 df 5b e9 13 99 ff ff 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 53 48 89 fb e8 53 b7 ec f6 48 81 c3 38 f8 ff ff 48 89 RSP: 0018:ffffc90000007d38 EFLAGS: 00000202 RAX: dffffc0000000000 RBX: ffff88807bed1620 RCX: a47ae6339c420800 RDX: 0000000000000000 RSI: ffffffff8be28420 RDI: ffff88807bed1608 RBP: ffffc90000007e30 R08: ffffffff8fa101f7 R09: 1ffffffff1f4203e R10: dffffc0000000000 R11: ffffffff8ad3a470 R12: ffff88807bed1610 R13: 1ffff1100f7da2c4 R14: ffff8880b8623d08 R15: ffff88807bed1608 FS: 0000000000000000(0000) GS:ffff888125c55000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbd1d65cc53 CR3: 000000007e760000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000200000000300 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: tasklet_action_common+0x36c/0x580 kernel/softirq.c:829 handle_softirqs+0x286/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:call_rcu+0x719/0x990 kernel/rcu/tree.c:3211 Code: 00 00 f6 84 24 81 00 00 00 02 75 5f f7 44 24 38 00 02 00 00 49 bc 00 00 00 00 00 fc ff df 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 66 43 c7 44 25 09 00 00 43 c6 44 25 0b RSP: 0018:ffffc90005706fa0 EFLAGS: 00000206 RAX: a47ae6339c420800 RBX: ffff88801fb35390 RCX: a47ae6339c420800 RDX: 0000000000000000 RSI: ffffffff8d97cb93 RDI: ffffffff8be28440 RBP: ffffc900057070b0 R08: ffffffff8fa101f7 R09: 1ffffffff1f4203e R10: dffffc0000000000 R11: fffffbfff1f4203f R12: dffffc0000000000 R13: 1ffff92000ae0e00 R14: 1ffff110170c793e R15: 00000000000003c5 context_switch kernel/sched/core.c:5399 [inline] __schedule+0x16fd/0x4d00 kernel/sched/core.c:6785 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7108 irqentry_exit+0x6f/0x90 kernel/entry/common.c:307 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:217 [inline] RIP: 0010:unwind_next_frame+0x214/0x2390 arch/x86/kernel/unwind_orc.c:494 Code: ef 08 8b 15 1e 82 47 0c 8d 42 ff 44 39 f8 0f 86 65 18 00 00 44 89 f8 4c 8d 2c 85 d4 f8 db 90 4c 89 e8 48 c1 e8 03 0f b6 04 28 <84> c0 48 89 eb 0f 85 1c 1c 00 00 45 8b 6d 00 44 89 f8 ff c0 48 8d RSP: 0018:ffffc90005707458 EFLAGS: 00000a03 RAX: 0000000000000000 RBX: 0000000000000001 RCX: a47ae6339c420800 RDX: 00000000000a6963 RSI: ffffffff8be28420 RDI: ffffffff8be283e0 RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffffff81729de5 R10: ffffc90005707578 R11: ffffffff81acf670 R12: ffffffff818d3e30 R13: ffffffff90de2dcc R14: ffffc90005707528 R15: 0000000000008d3e arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2381 [inline] slab_free mm/slub.c:4643 [inline] kmem_cache_free+0x18f/0x400 mm/slub.c:4745 __dentry_kill+0x4d2/0x660 fs/dcache.c:688 dput+0x19f/0x2b0 fs/dcache.c:911 __fput+0x68e/0xa70 fs/file_table.c:473 task_work_run+0x1d1/0x260 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x6ad/0x22e0 kernel/exit.c:955 do_group_exit+0x21c/0x2d0 kernel/exit.c:1104 get_signal+0x1286/0x1340 kernel/signal.c:3034 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:111 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4a08b8e929 Code: Unable to access opcode bytes at 0x7f4a08b8e8ff. RSP: 002b:00007f4a09a41038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: 0000000000000009 RBX: 00007f4a08db5fa0 RCX: 00007f4a08b8e929 RDX: 0000000000000018 RSI: 0000200000000140 RDI: 0000000000000011 RBP: 00007f4a08c10b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f4a08db5fa0 R15: 00007fffe64d0fb8 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6245 Comm: dhcpcd Not tainted 6.15.0-syzkaller-ge41079f53e87 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline] RIP: 0010:smp_call_function_many_cond+0xf69/0x12d0 kernel/smp.c:885 Code: 00 45 8b 2f 44 89 ee 83 e6 01 31 ff e8 60 78 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 0b 74 0b 00 eb 37 f3 90 <43> 0f b6 04 2c 84 c0 75 10 41 f7 07 01 00 00 00 74 1e e8 f0 73 0b RSP: 0018:ffffc90003d9f5a0 EFLAGS: 00000293 RAX: ffffffff81b4e7e0 RBX: ffff8880b873cb40 RCX: ffff88802f391e00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90003d9f700 R08: ffffffff8fa101f7 R09: 1ffffffff1f4203e R10: dffffc0000000000 R11: fffffbfff1f4203f R12: 1ffff110170c86b5 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b86435a8 FS: 0000000000000000(0000) GS:ffff888125d55000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055eee4225660 CR3: 000000000df38000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline] flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline] flush_tlb_mm_range+0x6b1/0x12c0 arch/x86/mm/tlb.c:1451 tlb_flush arch/x86/include/asm/tlb.h:23 [inline] tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:490 [inline] tlb_flush_mmu+0x1a7/0x680 mm/mmu_gather.c:403 tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:497 free_ldt_pgtables+0x17b/0x320 arch/x86/kernel/ldt.c:411 arch_exit_mmap arch/x86/include/asm/mmu_context.h:234 [inline] exit_mmap+0x17c/0xb50 mm/mmap.c:1270 __mmput+0x118/0x420 kernel/fork.c:1121 exit_mm+0x1da/0x2c0 kernel/exit.c:581 do_exit+0x640/0x22e0 kernel/exit.c:943 do_group_exit+0x21c/0x2d0 kernel/exit.c:1104 __do_sys_exit_group kernel/exit.c:1115 [inline] __se_sys_exit_group kernel/exit.c:1113 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1113 x64_sys_call+0x21ba/0x21c0 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9faf73e6c5 Code: Unable to access opcode bytes at 0x7f9faf73e69b. RSP: 002b:00007ffe1b98cca8 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f9faf73e6c5 RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000001 RBP: 00007ffe1b98d2b8 R08: 000055ef0d5bf2c0 R09: 0000000000000002 R10: 00000000000000e0 R11: 0000000000000206 R12: 00007ffe1b98ccf0 R13: 000055ef0d5c0950 R14: 00007ffe1b98cf30 R15: 00007ffe1b98cce0