watchdog: BUG: soft lockup - CPU#0 stuck for 144s! [syz.0.425:8192] Modules linked in: irq event stamp: 14014797 hardirqs last enabled at (14014796): [] irqentry_exit+0x5dd/0x660 kernel/entry/common.c:219 hardirqs last disabled at (14014797): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (13307760): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (13307760): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (13307760): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (13307763): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (13307763): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (13307763): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 8192 Comm: syz.0.425 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:80 [inline] RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:102 [inline] RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:227 [inline] RIP: 0010:unwind_next_frame+0x1315/0x2390 arch/x86/kernel/unwind_orc.c:494 Code: 83 e0 fe 4c 8d 3c 45 00 00 00 00 49 01 ef 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 75 27 49 63 07 <4c> 01 f8 49 8d 4f 04 4c 39 e0 48 0f 46 e9 49 8d 47 fc 48 0f 47 d8 RSP: 0018:ffffc90000006ed8 EFLAGS: 00000246 RAX: fffffffff1eafe4c RBX: ffffffff8f985340 RCX: dffffc0000000000 RDX: ffffffff8f98533c RSI: ffffffff90135380 RDI: ffffffff8bbfc600 RBP: ffffffff8f98533c R08: 0000000000000006 R09: ffffffff8df41cc0 R10: ffffc90000006ac8 R11: fffff52000000d5b R12: ffffffff8183530a R13: ffffffff8f98533c R14: ffffc90000006fa8 R15: ffffffff8f98533c FS: 00007fe6f1b076c0(0000) GS:ffff8881260b1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32314ff8 CR3: 00000000623ea000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 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+0x3e/0x60 mm/kasan/common.c:56 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:559 __call_rcu_common kernel/rcu/tree.c:3119 [inline] call_rcu+0x157/0x9c0 kernel/rcu/tree.c:3239 refdst_drop include/net/dst.h:266 [inline] skb_dst_drop include/net/dst.h:278 [inline] __dev_queue_xmit+0x4ac/0x3140 net/core/dev.c:4772 neigh_output include/net/neighbour.h:556 [inline] ip6_finish_output2+0xfb3/0x1480 net/ipv6/ip6_output.c:136 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip6_output+0x340/0x550 net/ipv6/ip6_output.c:247 NF_HOOK include/linux/netfilter.h:318 [inline] ndisc_send_skb+0xbce/0x1510 net/ipv6/ndisc.c:512 addrconf_rs_timer+0x369/0x670 net/ipv6/addrconf.c:4037 call_timer_fn+0x16e/0x590 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2404 handle_softirqs+0x27d/0x850 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lock_is_held_type+0x137/0x190 kernel/locking/lockdep.c:5945 Code: 01 75 44 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 4c 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b 05 a9 aa 2d 07 <48> 3b 44 24 08 75 43 89 d8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f RSP: 0018:ffffc900025fe8d8 EFLAGS: 00000206 RAX: 5df781c5c8931a00 RBX: 0000000000000000 RCX: 5df781c5c8931a00 RDX: 0000000000000000 RSI: ffffffff8d952009 RDI: ffffffff8bbfc660 RBP: 00000000ffffffff R08: ffffffff8f805a77 R09: 1ffffffff1f00b4e R10: dffffc0000000000 R11: fffffbfff1f00b4f R12: 0000000000000246 R13: ffff888033998000 R14: ffffffff8df41d80 R15: 0000000000000005 lock_is_held include/linux/lockdep.h:249 [inline] schedule_debug kernel/sched/core.c:5835 [inline] __schedule+0x278/0x5000 kernel/sched/core.c:6740 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7190 irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:rcu_read_lock include/linux/rcupdate.h:868 [inline] RIP: 0010:class_rcu_constructor include/linux/rcupdate.h:1195 [inline] RIP: 0010:unwind_next_frame+0xc6/0x2390 arch/x86/kernel/unwind_orc.c:479 Code: 34 00 4c 8d 3d 00 00 00 00 48 c7 c7 c0 1c f4 8d 31 f6 31 d2 b9 02 00 00 00 45 31 c0 45 31 c9 41 57 e8 5e 3a 2a 00 48 83 c4 08 b5 58 d5 09 85 c0 74 3a e8 bc 55 33 00 84 c0 75 31 e8 a3 58 d5 RSP: 0018:ffffc900025fecf8 EFLAGS: 00000282 RAX: 5df781c5c8931a00 RBX: ffffffff820f0ce0 RCX: 5df781c5c8931a00 RDX: 0000000001026ed2 RSI: ffffffff8d952009 RDI: ffffffff8bbfc660 RBP: dffffc0000000000 R08: ffffffff8173ef25 R09: ffffffff8df41cc0 R10: ffffc900025fe8c8 R11: fffff520004bfd1b R12: 1ffff920004bfdb9 R13: ffffc900025fee00 R14: ffffc900025fedc8 R15: ffffffff8173ef25 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 save_stack+0xf5/0x1f0 mm/page_owner.c:156 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:311 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1394 [inline] __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2901 discard_slab mm/slub.c:3346 [inline] __put_partials+0x146/0x170 mm/slub.c:3886 put_cpu_partial+0x1f2/0x2d0 mm/slub.c:3961 __slab_free+0x288/0x2a0 mm/slub.c:5947 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:352 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4948 [inline] slab_alloc_node mm/slub.c:5258 [inline] kmem_cache_alloc_noprof+0x367/0x6f0 mm/slub.c:5265 ptlock_alloc+0x20/0x70 mm/memory.c:7332 ptlock_init include/linux/mm.h:3034 [inline] pagetable_pte_ctor include/linux/mm.h:3088 [inline] __pte_alloc_one_noprof include/asm-generic/pgalloc.h:78 [inline] pte_alloc_one+0x7a/0x310 arch/x86/mm/pgtable.c:18 __pte_alloc+0x25/0x1a0 mm/memory.c:453 copy_pte_range mm/memory.c:1236 [inline] copy_pmd_range+0x7805/0x7f00 mm/memory.c:1390 copy_pud_range mm/memory.c:1427 [inline] copy_p4d_range mm/memory.c:1451 [inline] copy_page_range+0xc14/0x1270 mm/memory.c:1539 dup_mmap+0xf4c/0x1b10 mm/mmap.c:1834 dup_mm kernel/fork.c:1486 [inline] copy_mm+0x13c/0x4b0 kernel/fork.c:1538 copy_process+0x165d/0x3950 kernel/fork.c:2178 kernel_clone+0x21e/0x820 kernel/fork.c:2608 __do_sys_clone kernel/fork.c:2749 [inline] __se_sys_clone kernel/fork.c:2733 [inline] __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2733 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe6f0b8f749 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:00007fe6f1b06fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fe6f0de5fa0 RCX: 00007fe6f0b8f749 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fe6f0c13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe6f0de6038 R14: 00007fe6f0de5fa0 R15: 00007ffd84d80b58 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5841 Comm: kworker/u9:2 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: hci5 hci_cmd_timeout RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210 Code: 89 fb e8 23 00 00 00 48 8b 3d b4 7b d7 0b 48 89 de 5b e9 13 d2 5a 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 08 f0 76 92 65 8b 15 b8 a5 RSP: 0018:ffffc9000406f2f0 EFLAGS: 00000046 RAX: 1ffffffff336ee9f RBX: 0000000000000200 RCX: ffff888020fc8000 RDX: 0000000000000000 RSI: ffffffff998639e0 RDI: ffffffff99b77200 RBP: ffffc9000406f4b0 R08: ffffffff81a13551 R09: ffffffff8df35ca0 R10: dffffc0000000000 R11: ffffffff8514faa0 R12: 0000000000000000 R13: dffffc0000000000 R14: ffffffff99b774f8 R15: ffffffff99b77200 FS: 0000000000000000(0000) GS:ffff8881261b1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055557f22b5c8 CR3: 0000000028956000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: arch_touch_nmi_watchdog+0x9/0x20 kernel/watchdog.c:137 touch_nmi_watchdog include/linux/nmi.h:147 [inline] serial8250_console_write+0xd2/0x1ba0 drivers/tty/serial/8250/8250_port.c:3296 console_emit_next_record kernel/printk/printk.c:3129 [inline] console_flush_one_record kernel/printk/printk.c:3215 [inline] console_flush_all+0x745/0xb60 kernel/printk/printk.c:3289 __console_flush_and_unlock kernel/printk/printk.c:3319 [inline] console_unlock+0xbb/0x190 kernel/printk/printk.c:3359 vprintk_emit+0x4f8/0x5f0 kernel/printk/printk.c:2426 _printk+0xcf/0x120 kernel/printk/printk.c:2451 bt_err+0x10b/0x160 net/bluetooth/lib.c:296 hci_cmd_timeout+0xff/0x1e0 net/bluetooth/hci_core.c:1473 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246