watchdog: BUG: soft lockup - CPU#1 stuck for 120s! [syz.8.422:7788] Modules linked in: irq event stamp: 6331 hardirqs last enabled at (6330): [] __local_bh_enable_ip+0xd6/0x140 kernel/softirq.c:478 hardirqs last disabled at (6331): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1062 softirqs last enabled at (0): [] rcu_lock_acquire include/linux/rcupdate.h:309 [inline] softirqs last enabled at (0): [] rcu_read_lock include/linux/rcupdate.h:849 [inline] softirqs last enabled at (0): [] copy_process+0xd17/0x4510 kernel/fork.c:2185 softirqs last disabled at (139): [] __do_softirq kernel/softirq.c:703 [inline] softirqs last disabled at (139): [] invoke_softirq kernel/softirq.c:542 [inline] softirqs last disabled at (139): [] __irq_exit_rcu+0xc6/0x220 kernel/softirq.c:786 CPU: 1 UID: 0 PID: 7788 Comm: syz.8.422 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 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 ee dc 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:ffffc90000a08168 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000102 RDX: ffff88807f689f40 RSI: ffffffff8e933c05 RDI: ffffffff8c8e9d80 RBP: 00000000ffffffff R08: 0000000000000100 R09: 0000000000000000 R10: ffffc90000a08220 R11: fffff52000141046 R12: 0000000000000246 R13: ffff88807f689f40 R14: ffffffff9015a2a0 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888123510000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe63c264ff8 CR3: 000000000ff48000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: bpf_prog_run_array include/linux/bpf.h:2789 [inline] trace_call_bpf+0x1f3/0xb80 kernel/trace/bpf_trace.c:147 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:11524 do_perf_trace_lock include/trace/events/lock.h:49 [inline] perf_trace_lock+0x32e/0x410 include/trace/events/lock.h:49 __do_trace_lock_release include/trace/events/lock.h:68 [inline] trace_lock_release include/trace/events/lock.h:68 [inline] lock_release+0x396/0x3c0 kernel/locking/lockdep.c:5954 rcu_lock_release include/linux/rcupdate.h:319 [inline] rcu_read_unlock include/linux/rcupdate.h:880 [inline] class_rcu_destructor include/linux/rcupdate.h:1216 [inline] unwind_next_frame+0x1baa/0x2550 arch/x86/kernel/unwind_orc.c:709 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 dst_alloc+0x105/0x170 net/core/dst.c:90 ip6_dst_alloc net/ipv6/route.c:351 [inline] icmp6_dst_alloc+0x72/0x430 net/ipv6/route.c:3324 ndisc_send_skb+0x42f/0x1650 net/ipv6/ndisc.c:492 addrconf_rs_timer+0x2d2/0x6c0 net/ipv6/addrconf.c:4098 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:__tlb_remove_folio_pages_size+0x1fb/0x590 mm/mmu_gather.c:202 Code: 2b 66 9f ff 41 80 3c 1e 00 4c 8b 34 24 74 08 4c 89 f7 e8 08 a6 16 00 4d 89 26 49 8d 7c 24 08 48 89 f8 48 c1 e8 03 0f b6 04 18 <84> c0 0f 85 74 02 00 00 41 8b 6c 24 08 49 83 c4 0c 4c 89 e0 48 c1 RSP: 0018:ffffc9000230f5f0 EFLAGS: 00000a02 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff88807f689f40 RDX: 0000000000000000 RSI: 00000000000001fd RDI: ffff88805c5e1008 RBP: 000000000000010d R08: ffffea00013bbdf3 R09: 1ffffd40002777be R10: dffffc0000000000 R11: fffff940002777bf R12: ffff88805c5e1000 R13: 00000000000001fd R14: 1ffff92000461f69 R15: ffffc9000230fb20 zap_present_folio_ptes mm/memory.c:1771 [inline] zap_present_ptes mm/memory.c:1824 [inline] do_zap_pte_range mm/memory.c:1926 [inline] zap_pte_range mm/memory.c:2028 [inline] zap_pmd_range mm/memory.c:2114 [inline] zap_pud_range mm/memory.c:2142 [inline] zap_p4d_range mm/memory.c:2163 [inline] __zap_vma_range+0x2423/0x4f70 mm/memory.c:2203 unmap_vmas+0x38b/0x550 mm/memory.c:2272 exit_mmap+0x290/0xa40 mm/mmap.c:1315 __mmput+0x118/0x420 kernel/fork.c:1192 exit_mm+0x18e/0x240 kernel/exit.c:586 do_exit+0x6a8/0x2360 kernel/exit.c:967 __do_sys_exit kernel/exit.c:1090 [inline] __se_sys_exit kernel/exit.c:1088 [inline] __x64_sys_exit+0x40/0x40 kernel/exit.c:1088 x64_sys_call+0x18b4/0x18d0 arch/x86/include/generated/asm/syscalls_64.h:61 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: 0033:0x7f7500b9fb19 Code: Unable to access opcode bytes at 0x7f7500b9faef. RSP: 002b:00007f7501acefd8 EFLAGS: 00000246 ORIG_RAX: 000000000000003c RAX: ffffffffffffffda RBX: 00007f7500e25fa0 RCX: 00007f7500b9fb19 RDX: 00007f7501acf9c8 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f7500c37b70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7500e26038 R14: 00007f7500e25fa0 R15: 00007ffda361e738 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 7790 Comm: syz.9.424 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 RIP: 0010:csd_lock_wait kernel/smp.c:389 [inline] RIP: 0010:smp_call_function_many_cond+0x1132/0x1500 kernel/smp.c:1028 Code: 78 44 8b 2b 44 89 ee 83 e6 01 31 ff e8 17 6f 0c 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 f2 69 0c 00 eb 35 f3 90 <43> 0f b6 04 2c 84 c0 75 0f f7 03 01 00 00 00 74 1d e8 d8 69 0c 00 RSP: 0000:ffffc900037a7720 EFLAGS: 00000293 RAX: ffffffff81bca5c8 RBX: ffff8880b8342008 RCX: ffff888072460000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900037a7870 R08: ffffffff91bdeebf R09: 1ffffffff237bdd7 R10: dffffc0000000000 R11: fffffbfff237bdd8 R12: 1ffff11017068401 R13: dffffc0000000000 R14: 1ffff1100e48c2b3 R15: 0000000000000001 FS: 000055557fe8e500(0000) GS:ffff888123410000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffb0e26b42a CR3: 0000000076b34000 CR4: 00000000003526f0 DR0: 0000200000000500 DR1: 0000000000000000 DR2: 0000000000000000 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: 0033:0x7fe63b2528fc Code: 23 83 c0 01 44 39 d0 75 dc 48 89 f0 25 ff 1f 00 00 49 89 34 c1 41 88 3c 00 31 c0 c3 66 90 41 38 3c 10 74 0b 41 88 3c 10 31 c0 <49> 89 34 d1 c3 b8 01 00 00 00 c3 66 0f 1f 84 00 00 00 00 00 48 83 RSP: 002b:00007ffe7122d9c8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffffff81d55471 RCX: 0000000000000000 RDX: 0000000000001471 RSI: ffffffff81d55471 RDI: 0000000000000000 RBP: 0000000000000000 R08: 00007fe63b610000 R09: 00007fe63b612000 R10: 0000000081d55475 R11: 0000000000000000 R12: 00007fe63b626038 R13: 0000000000000014 R14: ffffffff81d55b5c R15: 00007fe63c155720