watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz.1.62:6132] Modules linked in: irq event stamp: 19415677 hardirqs last enabled at (19415676): [] irqentry_exit+0x63/0x90 kernel/entry/common.c:357 hardirqs last disabled at (19415677): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1049 softirqs last enabled at (3076298): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (3076298): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (3076298): [] __irq_exit_rcu+0xfb/0x220 kernel/softirq.c:680 softirqs last disabled at (3076301): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (3076301): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (3076301): [] __irq_exit_rcu+0xfb/0x220 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 6132 Comm: syz.1.62 Not tainted 6.15.0-rc2-syzkaller-g1a1d569a75f3 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:unwind_get_return_address+0x6/0x90 arch/x86/kernel/unwind_orc.c:365 Code: 7c 24 40 8b 74 24 14 e9 da fe ff ff e8 53 c7 c2 0a 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 <41> 56 53 48 89 fb 49 be 00 00 00 00 00 fc ff df 48 89 f8 48 c1 e8 RSP: 0018:ffffc900000074b0 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffffc900000074c0 RCX: ffffffff9368d020 RDX: dffffc0000000000 RSI: ffffffff8e69d047 RDI: ffffc900000074c0 RBP: ffffc90000007550 R08: ffffffff905fe177 R09: 1ffffffff20bfc2e R10: dffffc0000000000 R11: fffffbfff20bfc2f R12: ffff888026128000 R13: ffffffff81aee8b0 R14: ffffc900000075a0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888124f93000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005615cd4c1bd8 CR3: 0000000024bc0000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: arch_stack_walk+0xff/0x150 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0x11a/0x1d0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4151 [inline] slab_alloc_node mm/slub.c:4200 [inline] kmem_cache_alloc_node_noprof+0x1f2/0x3b0 mm/slub.c:4252 kmalloc_reserve+0xa8/0x2a0 net/core/skbuff.c:577 __alloc_skb+0x1f2/0x480 net/core/skbuff.c:668 alloc_skb include/linux/skbuff.h:1340 [inline] ndisc_alloc_skb+0xa2/0x480 net/ipv6/ndisc.c:423 ndisc_send_rs+0x241/0x5c0 net/ipv6/ndisc.c:707 addrconf_rs_timer+0x380/0x680 net/ipv6/addrconf.c:4038 call_timer_fn+0x189/0x650 kernel/time/timer.c:1789 expire_timers kernel/time/timer.c:1840 [inline] __run_timers kernel/time/timer.c:2414 [inline] __run_timer_base+0x66e/0x8e0 kernel/time/timer.c:2426 run_timer_base kernel/time/timer.c:2435 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2445 handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xfb/0x220 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+0xf9/0x1c0 kernel/sched/core.c:7090 Code: 89 fe 49 c1 ee 03 eb 0d 48 f7 03 08 00 00 00 0f 84 89 00 00 00 bf 01 00 00 00 e8 82 94 5e f5 e8 3d 53 99 f5 fb bf 01 00 00 00 32 a5 ff ff 43 80 3c 26 00 74 08 4c 89 ff e8 23 9b fb f5 48 c7 RSP: 0018:ffffc9000b3f6c60 EFLAGS: 00000282 RAX: 62cc240e7bef6800 RBX: 1ffff9200167ed94 RCX: 0000000000000007 RDX: 0000000000000007 RSI: ffffffff8e69d047 RDI: 0000000000000001 RBP: ffffc9000b3f6d10 R08: ffffffff905fe177 R09: 1ffffffff20bfc2e R10: dffffc0000000000 R11: fffffbfff20bfc2f R12: dffffc0000000000 R13: 1ffff9200167ed8c R14: 1ffff9200167ed90 R15: ffffc9000b3f6c80 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:write_comp_data kernel/kcov.c:246 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x11/0x90 kernel/kcov.c:321 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 f3 0f 1e fa 4c 8b 04 24 65 48 8b 0c 25 08 d0 68 93 <65> 8b 05 08 76 a5 11 25 00 01 ff 00 74 10 3d 00 01 00 00 75 57 83 RSP: 0018:ffffc9000b3f6dd8 EFLAGS: 00000286 RAX: ffffffff82027f83 RBX: 0000000000000012 RCX: ffff888026128000 RDX: 0000000000000000 RSI: 0000000000000012 RDI: 000000000000001f RBP: ffffc9000b3f6f10 R08: ffffffff82027c35 R09: 1ffffd400038630e R10: dffffc0000000000 R11: fffff9400038630f R12: ffffc9000b3f6f80 R13: dffffc0000000000 R14: ffffc9000b3f7018 R15: 0000000000000013 folios_put_refs+0x175/0x800 mm/swap.c:948 free_pages_and_swap_cache+0x2ea/0x6a0 mm/swap_state.c:267 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:397 [inline] tlb_flush_mmu+0x3a9/0x690 mm/mmu_gather.c:404 zap_pte_range mm/memory.c:1770 [inline] zap_pmd_range mm/memory.c:1823 [inline] zap_pud_range mm/memory.c:1852 [inline] zap_p4d_range mm/memory.c:1873 [inline] unmap_page_range+0x3a84/0x44d0 mm/memory.c:1894 unmap_vmas+0x3ce/0x5f0 mm/memory.c:1984 exit_mmap+0x2bc/0xde0 mm/mmap.c:1284 __mmput+0x115/0x420 kernel/fork.c:1379 exit_mm+0x221/0x310 kernel/exit.c:589 do_exit+0x994/0x27f0 kernel/exit.c:940 do_group_exit+0x207/0x2c0 kernel/exit.c:1102 get_signal+0x1696/0x1730 kernel/signal.c:3034 arch_do_signal_or_restart+0x98/0x840 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fef2f98e169 Code: Unable to access opcode bytes at 0x7fef2f98e13f. RSP: 002b:00007fef307a70e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 00007fef2fbb5fa8 RCX: 00007fef2f98e169 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fef2fbb5fac RBP: 00007fef2fbb5fa0 R08: 7fffffffffffffff R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000246 R12: 00007fef2fbb5fac R13: 0000000000000000 R14: 00007ffe1d0538d0 R15: 00007ffe1d0539b8 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 1098 Comm: kworker/u8:5 Not tainted 6.15.0-rc2-syzkaller-g1a1d569a75f3 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline] RIP: 0010:smp_call_function_many_cond+0x1bba/0x2d40 kernel/smp.c:885 Code: 01 31 ff e8 18 e3 0b 00 41 83 e4 01 4c 8b 64 24 68 75 07 e8 c8 de 0b 00 eb 41 f3 90 48 b8 00 00 00 00 00 fc ff df 0f b6 04 03 <84> c0 75 11 41 f7 45 00 01 00 00 00 74 1e e8 a3 de 0b 00 eb db 44 RSP: 0018:ffffc9000396f640 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 1ffff110170c823d RCX: ffff888027468000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000396f840 R08: ffffffff81b77658 R09: 1ffffffff20bfc2e R10: dffffc0000000000 R11: fffffbfff20bfc2f R12: ffff8880b873ad08 R13: ffff8880b86411e8 R14: ffff8880b873ad00 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125093000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffad8a4a4f7 CR3: 000000000eb38000 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] text_poke_sync arch/x86/kernel/alternative.c:2455 [inline] text_poke_bp_batch+0x354/0xb30 arch/x86/kernel/alternative.c:2665 text_poke_flush arch/x86/kernel/alternative.c:2856 [inline] text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2863 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_disable_cpuslocked+0xd2/0x1c0 kernel/jump_label.c:240 static_key_disable+0x1a/0x20 kernel/jump_label.c:248 toggle_allocation_gate+0x1b1/0x250 mm/kfence/core.c:855 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319 worker_thread+0x870/0xd50 kernel/workqueue.c:3400 kthread+0x7b7/0x940 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245