watchdog: BUG: soft lockup - CPU#1 stuck for 169s! [syz-executor:29581] Modules linked in: irq event stamp: 102073 hardirqs last enabled at (102072): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:210 [inline] hardirqs last enabled at (102072): [] _raw_spin_unlock_irqrestore+0x30/0x80 kernel/locking/spinlock.c:221 hardirqs last disabled at (102073): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1062 softirqs last enabled at (98176): [] __do_softirq kernel/softirq.c:703 [inline] softirqs last enabled at (98176): [] invoke_softirq kernel/softirq.c:542 [inline] softirqs last enabled at (98176): [] __irq_exit_rcu+0xc6/0x220 kernel/softirq.c:786 softirqs last disabled at (98195): [] __do_softirq kernel/softirq.c:703 [inline] softirqs last disabled at (98195): [] invoke_softirq kernel/softirq.c:542 [inline] softirqs last disabled at (98195): [] __irq_exit_rcu+0xc6/0x220 kernel/softirq.c:786 CPU: 1 UID: 0 PID: 29581 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026 RIP: 0010:in_softirq_really kernel/kcov.c:167 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:179 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x2e/0x80 kernel/kcov.c:223 Code: 48 8b 04 24 65 48 8b 0d 08 27 19 13 65 48 8b 15 08 27 19 13 f7 c2 00 01 00 ff 74 29 89 d6 81 e6 00 01 00 0f 81 fe 00 01 00 00 <40> 0f 95 c6 81 fa 00 00 00 10 0f 93 c2 40 08 f2 75 35 83 b9 44 17 RSP: 0018:ffffc90000a082e0 EFLAGS: 00000246 RAX: ffffffff820e1349 RBX: 0000000000000001 RCX: ffff888056135dc0 RDX: 0000000000000102 RSI: 0000000000000100 RDI: 0000000000000000 RBP: dffffc0000000000 R08: 0000000000000100 R09: 0000000000000000 R10: ffffc90000a08260 R11: ffffffffa0401320 R12: ffffe8ffff91d000 R13: ffffffff90025be0 R14: ffff8880b83337f8 R15: 0000000000000000 FS: 000055558bd72500(0000) GS:ffff8881234fd000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005654cd4a3950 CR3: 0000000057eea000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000008d24 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: perf_trace_run_bpf_submit+0xf9/0x170 kernel/events/core.c:11524 do_perf_trace_lock_acquire include/trace/events/lock.h:23 [inline] perf_trace_lock_acquire+0x346/0x440 include/trace/events/lock.h:23 __do_trace_lock_acquire include/trace/events/lock.h:23 [inline] trace_lock_acquire include/trace/events/lock.h:23 [inline] lock_acquire+0x303/0x350 kernel/locking/lockdep.c:5905 rcu_lock_acquire include/linux/rcupdate.h:309 [inline] rcu_read_lock include/linux/rcupdate.h:849 [inline] class_rcu_constructor include/linux/rcupdate.h:1216 [inline] unwind_next_frame+0xac/0x2550 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:351 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:377 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4720 [inline] slab_alloc_node mm/slub.c:5033 [inline] kmem_cache_alloc_noprof+0x2b4/0x600 mm/slub.c:5047 kmem_alloc_batch lib/debugobjects.c:371 [inline] fill_pool+0x163/0x610 lib/debugobjects.c:420 debug_objects_fill_pool lib/debugobjects.c:780 [inline] debug_object_assert_init+0x330/0x380 lib/debugobjects.c:1066 debug_timer_assert_init kernel/time/timer.c:804 [inline] debug_assert_init kernel/time/timer.c:849 [inline] __mod_timer+0x4b/0xed0 kernel/time/timer.c:1026 addrconf_mod_rs_timer+0x51/0xe0 net/ipv6/addrconf.c:332 addrconf_rs_timer+0x3d8/0x6c0 net/ipv6/addrconf.c:4108 call_timer_fn+0x18d/0x5f0 kernel/time/timer.c:1749 expire_timers kernel/time/timer.c:1800 [inline] __run_timers kernel/time/timer.c:2375 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2387 run_timer_base kernel/time/timer.c:2396 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2406 handle_softirqs+0x265/0x8d0 kernel/softirq.c:669 __do_softirq kernel/softirq.c:703 [inline] invoke_softirq kernel/softirq.c:542 [inline] __irq_exit_rcu+0xc6/0x220 kernel/softirq.c:786 irq_exit_rcu+0x9/0x30 kernel/softirq.c:809 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:lock_is_held_type+0x106/0x150 kernel/locking/lockdep.c:6021 Code: 1c 00 00 b8 ff ff ff ff 65 0f c1 05 8c 7e d8 08 83 f8 01 75 25 9c 58 a9 00 02 00 00 75 39 41 f7 c4 00 02 00 00 74 01 fb 89 d8 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 0b 10 03 00 cc 90 0f 0b 90 48 c7 RSP: 0018:ffffc900047b6d68 EFLAGS: 00000206 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000046 RDX: 0000000000000000 RSI: ffffffff8e9365c4 RDI: ffffffff8c8ead80 RBP: 00000000ffffffff R08: ffffffff82374d2c R09: 0000000000000000 R10: ffffc900047b6b60 R11: ffffffffa0401320 R12: 0000000000000246 R13: ffff888056135dc0 R14: ffffffff9015a360 R15: 0000000000000007 lock_is_held include/linux/lockdep.h:249 [inline] __might_resched+0x86/0x4c0 kernel/sched/core.c:9157 might_alloc include/linux/sched/mm.h:322 [inline] slab_pre_alloc_hook mm/slub.c:4673 [inline] slab_alloc_node mm/slub.c:5011 [inline] __do_kmalloc_node mm/slub.c:5530 [inline] __kmalloc_node_track_caller_noprof+0xec/0x720 mm/slub.c:5662 kvasprintf+0xeb/0x1a0 lib/kasprintf.c:25 kobject_set_name_vargs+0x61/0x110 lib/kobject.c:274 kobject_add_varg lib/kobject.c:368 [inline] kobject_init_and_add+0xee/0x1a0 lib/kobject.c:457 rx_queue_add_kobject net/core/net-sysfs.c:1274 [inline] net_rx_queue_update_kobjects+0x24d/0x780 net/core/net-sysfs.c:1336 register_queue_kobjects net/core/net-sysfs.c:2134 [inline] netdev_register_kobject+0x23e/0x350 net/core/net-sysfs.c:2385 register_netdevice+0x17be/0x2280 net/core/dev.c:11701 nsim_init_netdevsim drivers/net/netdevsim/netdev.c:1080 [inline] nsim_create+0xb25/0x1040 drivers/net/netdevsim/netdev.c:1162 __nsim_dev_port_add+0x7f8/0xcd0 drivers/net/netdevsim/dev.c:1434 nsim_dev_port_add_all+0x37/0xf0 drivers/net/netdevsim/dev.c:1495 nsim_drv_probe+0x8b0/0xbb0 drivers/net/netdevsim/dev.c:1656 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x254/0xae0 drivers/base/dd.c:707 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:869 driver_probe_device+0x4f/0x240 drivers/base/dd.c:899 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1027 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500 __device_attach+0x2bd/0x430 drivers/base/dd.c:1131 device_initial_probe+0x9c/0x100 drivers/base/dd.c:1190 __bus_probe_device+0x126/0x220 drivers/base/bus.c:614 device_add+0x7d7/0xb80 drivers/base/core.c:3778 nsim_bus_dev_new drivers/net/netdevsim/bus.c:468 [inline] new_device_store+0x3a4/0x6c0 drivers/net/netdevsim/bus.c:191 kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x612/0xba0 fs/read_write.c:687 ksys_write+0x150/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f582c96034e Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08 RSP: 002b:00007ffd403675e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000055558bd72500 RCX: 00007f582c96034e RDX: 0000000000000003 RSI: 00007ffd40367670 RDI: 0000000000000005 RBP: 00007f582ca3846b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 R13: 00007ffd40367670 R14: 00007ffd40367eb0 R15: 0000000000000003 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30016 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026 RIP: 0010:csd_lock_wait kernel/smp.c:389 [inline] RIP: 0010:csd_lock kernel/smp.c:422 [inline] RIP: 0010:smp_call_function_many_cond+0x61e/0x1500 kernel/smp.c:970 Code: b6 04 04 84 c0 0f 85 d5 03 00 00 44 8b 3b 44 89 fe 83 e6 01 31 ff e8 21 7a 0c 00 41 83 e7 01 75 07 e8 06 75 0c 00 eb 3f f3 90 <48> b8 00 00 00 00 00 fc ff df 41 0f b6 04 04 84 c0 75 0f f7 03 01 RSP: 0000:ffffc900040c7720 EFLAGS: 00000293 RAX: ffffffff81bc940e RBX: ffff8880b8342008 RCX: ffff88802976be80 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900040c7870 R08: ffff88802976d41f R09: 1ffff110052eda83 R10: dffffc0000000000 R11: ffffffff817a65a0 R12: 1ffff11017068401 R13: 0000000000000001 R14: ffff8880b8342000 R15: 0000000000000001 FS: 00007fd346e37880(0000) GS:ffff8881233fd000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005619cad39f28 CR3: 000000005b4a8000 CR4: 00000000003526f0 DR0: 0000200000000940 DR1: 0000000000000000 DR2: 0000000000008d24 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __flush_tlb_multi arch/x86/include/asm/paravirt.h:46 [inline] flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline] flush_tlb_mm_range+0x910/0x10b0 arch/x86/mm/tlb.c:1435 flush_tlb_page arch/x86/include/asm/tlbflush.h:352 [inline] ptep_clear_flush+0x120/0x170 mm/pgtable-generic.c:116 wp_page_copy mm/memory.c:4136 [inline] do_wp_page+0x3c3a/0x4b60 mm/memory.c:4535 handle_pte_fault mm/memory.c:6651 [inline] __handle_mm_fault mm/memory.c:6776 [inline] handle_mm_fault+0x15d7/0x3750 mm/memory.c:6943 do_user_addr_fault+0xb35/0x1480 arch/x86/mm/fault.c:1343 handle_page_fault arch/x86/mm/fault.c:1483 [inline] exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 RIP: 0033:0x7fd3466b5b69 Code: 10 48 81 f9 ff 03 00 00 76 28 48 8b 57 20 48 85 d2 74 1f 48 3b 7a 28 75 76 48 8b 4f 28 48 3b 79 20 75 6c 48 83 78 20 00 74 17 <48> 89 4a 28 48 89 51 20 48 83 c4 08 c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffedcc6fe80 EFLAGS: 00010206 RAX: 00007fd3467f2120 RBX: 0000000000000cd0 RCX: 00005619cad39f00 RDX: 00005619cad39f00 RSI: 00007fd3467f2120 RDI: 00005619cad39f00 RBP: 00007fd3467f1ac0 R08: 0000000000000cd0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00005619cad355d0 R13: 00007fd3467f1ac0 R14: 0000000000000cd0 R15: 00007fd3467f1ac0