watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.8.137:7079] Modules linked in: irq event stamp: 15584283 hardirqs last enabled at (15584282): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:310 hardirqs last disabled at (15584283): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050 softirqs last enabled at (6586998): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (6586998): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (6586998): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (6587001): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (6587001): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (6587001): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 7079 Comm: syz.8.137 Not tainted 6.16.0-rc3-syzkaller-gee88bddf7f2f #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:unwind_next_frame+0x0/0x2390 arch/x86/kernel/unwind_orc.c:469 Code: cc cc 89 d9 80 e1 07 80 c1 03 38 c1 7c 92 48 89 df e8 c4 47 b1 00 eb 88 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 55 41 57 41 56 41 55 41 54 53 48 81 ec 98 00 00 00 49 RSP: 0018:ffffc900000075a0 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffffc90000007660 RCX: e5692ec33badd600 RDX: dffffc0000000000 RSI: ffffffff8b67d350 RDI: ffffc900000075a8 RBP: ffffc90000007630 R08: ffffc90000007670 R09: 0000000000000010 R10: dffffc0000000000 R11: ffffffff81ace6a0 R12: ffff88801c3abc00 R13: ffff888057811040 R14: ffffffff81ace6a0 R15: ffffc900000075a8 FS: 00007f84cabc56c0(0000) GS:ffff888125c51000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b33b0eff8 CR3: 0000000028fe0000 CR4: 00000000003526f0 DR0: 0100000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: 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 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4148 [inline] slab_alloc_node mm/slub.c:4197 [inline] kmem_cache_alloc_node_noprof+0x1bb/0x3c0 mm/slub.c:4249 kmalloc_reserve+0xbd/0x290 net/core/skbuff.c:579 __alloc_skb+0x142/0x2d0 net/core/skbuff.c:670 alloc_skb include/linux/skbuff.h:1336 [inline] ndisc_alloc_skb+0x9f/0x480 net/ipv6/ndisc.c:423 ndisc_send_rs+0x2b5/0x630 net/ipv6/ndisc.c:707 addrconf_rs_timer+0x369/0x670 net/ipv6/addrconf.c:4041 call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747 expire_timers kernel/time/timer.c:1798 [inline] __run_timers kernel/time/timer.c:2372 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384 run_timer_base kernel/time/timer.c:2393 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403 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_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0xa3/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:738 RIP: 0010:preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:7108 Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 4b ef 28 f6 e8 46 07 60 f6 fb bf 01 00 00 00 1b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24 RSP: 0018:ffffc90004a1f560 EFLAGS: 00000286 RAX: e5692ec33badd600 RBX: 0000000000000000 RCX: e5692ec33badd600 RDX: 0000000000000007 RSI: ffffffff8d9822ff RDI: 0000000000000001 RBP: ffffc90004a1f600 R08: ffffffff8fa10bf7 R09: 1ffffffff1f4217e R10: dffffc0000000000 R11: fffffbfff1f4217f R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000943eac 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:constant_test_bit arch/x86/include/asm/bitops.h:206 [inline] RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:238 [inline] RIP: 0010:tif_test_bit include/linux/thread_info.h:192 [inline] RIP: 0010:tif_need_resched include/linux/thread_info.h:208 [inline] RIP: 0010:need_resched include/linux/sched.h:2172 [inline] RIP: 0010:preempt_schedule_common+0x11/0xd0 kernel/sched/core.c:6973 Code: 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 41 56 53 49 bf 00 00 00 00 00 fc ff df eb 0d <48> f7 03 08 00 00 00 0f 84 9b 00 00 00 65 ff 05 6b 1f 35 07 65 8b RSP: 0018:ffffc90004a1f6c0 EFLAGS: 00000246 RAX: 1ffff11003875780 RBX: ffff88801c3abc00 RCX: e5692ec33badd600 RDX: 0000000000000000 RSI: ffffffff8be28d20 RDI: ffffffff8be28ce0 RBP: ffffc90004a1f758 R08: ffffffff8fa10bf7 R09: 1ffffffff1f4217e R10: dffffc0000000000 R11: fffffbfff1f4217f R12: dffffc0000000000 R13: ffffffff8e144240 R14: ffff88801c3ad0e0 R15: dffffc0000000000 preempt_schedule+0xae/0xc0 kernel/sched/core.c:6989 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0xfd/0x110 kernel/locking/spinlock.c:194 rcu_preempt_deferred_qs_irqrestore+0x851/0xc40 kernel/rcu/tree_plugin.h:-1 rcu_read_unlock_special+0x3fe/0x4c0 kernel/rcu/tree_plugin.h:693 __rcu_read_unlock+0x84/0xe0 kernel/rcu/tree_plugin.h:438 __reset_page_owner+0x85/0x1f0 mm/page_owner.c:309 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1248 [inline] __free_frozen_pages+0xc71/0xe70 mm/page_alloc.c:2706 __slab_free+0x326/0x400 mm/slub.c:4554 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4148 [inline] slab_alloc_node mm/slub.c:4197 [inline] kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4204 lsm_inode_alloc security/security.c:755 [inline] security_inode_alloc+0x39/0x330 security/security.c:1697 inode_init_always_gfp+0x9ed/0xdc0 fs/inode.c:306 inode_init_always include/linux/fs.h:3281 [inline] alloc_inode+0x82/0x1b0 fs/inode.c:353 new_inode_pseudo include/linux/fs.h:3364 [inline] sock_alloc net/socket.c:622 [inline] __sock_create+0x12d/0x9f0 net/socket.c:1505 sock_create net/socket.c:1599 [inline] __sys_socketpair+0x1c5/0x560 net/socket.c:1746 __do_sys_socketpair net/socket.c:1799 [inline] __se_sys_socketpair net/socket.c:1796 [inline] __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1796 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: 0033:0x7f84c9d8e929 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:00007f84cabc5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffda RBX: 00007f84c9fb5fa0 RCX: 00007f84c9d8e929 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 RBP: 00007f84c9e10b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000200000000680 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f84c9fb5fa0 R15: 00007ffda966f318 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 78 Comm: kworker/u8:4 Not tainted 6.16.0-rc3-syzkaller-gee88bddf7f2f #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: events_unbound toggle_allocation_gate 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 c0 79 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 6b 75 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 50 75 0b RSP: 0018:ffffc9000211f6a0 EFLAGS: 00000293 RAX: ffffffff81b4d920 RBX: ffff8880b873b1c0 RCX: ffff88801c303c00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000211f800 R08: ffffffff8fa10bf7 R09: 1ffffffff1f4217e R10: dffffc0000000000 R11: fffffbfff1f4217f R12: 1ffff110170c8385 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b8641c28 FS: 0000000000000000(0000) GS:ffff888125d51000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f00b9c594a6 CR3: 000000000df38000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052 on_each_cpu include/linux/smp.h:71 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2691 [inline] smp_text_poke_batch_finish+0x5e0/0x1100 arch/x86/kernel/alternative.c:2901 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_disable_cpuslocked+0xc5/0x1b0 kernel/jump_label.c:240 static_key_disable+0x1a/0x20 kernel/jump_label.c:248 toggle_allocation_gate+0x1a1/0x240 mm/kfence/core.c:855 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245