watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.5.1406:11529] Modules linked in: irq event stamp: 13934693 hardirqs last enabled at (13934692): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:214 hardirqs last disabled at (13934693): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1052 softirqs last enabled at (13658818): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (13658818): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (13658818): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (13658821): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (13658821): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (13658821): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 11529 Comm: syz.5.1406 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 RIP: 0010:rcu_read_unlock_special+0x87/0x4b0 kernel/rcu/tree_plugin.h:774 Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 52 8a a3 10 41 f7 c6 00 00 f0 00 74 49 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b RSP: 0018:ffffc90000007060 EFLAGS: 00000206 RAX: e555137316675900 RBX: 1ffff92000000e10 RCX: e555137316675900 RDX: 0000000000000003 RSI: ffffffff8d512c0f RDI: ffffffff8b9eea60 RBP: ffffc90000007138 R08: ffffffff8f5bed37 R09: 1ffffffff1eb7da6 R10: dffffc0000000000 R11: fffffbfff1eb7da7 R12: ffffffff8dd40400 R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001 FS: 00007f30481f66c0(0000) GS:ffff88812638a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f56277d5d58 CR3: 000000005fed0000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __rcu_read_unlock+0x84/0xe0 kernel/rcu/tree_plugin.h:438 rcu_read_unlock include/linux/rcupdate.h:873 [inline] class_rcu_destructor include/linux/rcupdate.h:1169 [inline] unwind_next_frame+0x19ae/0x2390 arch/x86/kernel/unwind_orc.c:680 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:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 unpoison_slab_object mm/kasan/common.c:342 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:368 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4946 [inline] slab_alloc_node mm/slub.c:5245 [inline] kmem_cache_alloc_node_noprof+0x433/0x710 mm/slub.c:5297 kmalloc_reserve+0xbd/0x290 net/core/skbuff.c:579 __alloc_skb+0x142/0x2d0 net/core/skbuff.c:670 napi_alloc_skb+0x84/0x7d0 net/core/skbuff.c:812 page_to_skb+0x288/0x930 drivers/net/virtio_net.c:889 receive_mergeable drivers/net/virtio_net.c:2495 [inline] receive_buf+0x45f/0x15e0 drivers/net/virtio_net.c:2633 virtnet_receive_packets drivers/net/virtio_net.c:2991 [inline] virtnet_receive drivers/net/virtio_net.c:3015 [inline] virtnet_poll+0x1fbc/0x2d80 drivers/net/virtio_net.c:3109 __napi_poll+0xc7/0x360 net/core/dev.c:7594 napi_poll net/core/dev.c:7657 [inline] net_rx_action+0x5f7/0xdf0 net/core/dev.c:7784 handle_softirqs+0x283/0x870 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:1052 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__is_kernel_text kernel/extable.c:95 [inline] RIP: 0010:is_kernel_text include/linux/kallsyms.h:29 [inline] RIP: 0010:core_kernel_text kernel/extable.c:68 [inline] RIP: 0010:kernel_text_address+0x5/0xe0 kernel/extable.c:99 Code: b6 c2 5b c3 cc cc cc cc cc 66 66 66 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 66 0f 1f 00 55 <41> 56 53 48 81 ff 00 00 00 81 0f 93 c0 48 81 ff 00 90 38 8b 0f 92 RSP: 0018:ffffc90003cdee08 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffffff81a538f7 RCX: e555137316675900 RDX: 0000000000000007 RSI: ffffffff8d512c0f RDI: ffffffff81a538f7 RBP: ffffc90003cdeed0 R08: ffffffff8f5bed37 R09: 1ffffffff1eb7da6 R10: dffffc0000000000 R11: fffffbfff1eb7da7 R12: ffff88802f098000 R13: 1ffff9200079be4c R14: dffffc0000000000 R15: 1ffff9200079bdd2 __kernel_text_address+0xd/0x40 kernel/extable.c:79 unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:369 arch_stack_walk+0xfc/0x150 arch/x86/kernel/stacktrace.c:26 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:3123 [inline] call_rcu+0x157/0x9c0 kernel/rcu/tree.c:3243 context_switch kernel/sched/core.c:5328 [inline] __schedule+0x17a0/0x4cc0 kernel/sched/core.c:6929 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7256 irqentry_exit+0x6f/0x90 kernel/entry/common.c:211 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:put_cpu_partial+0x234/0x2e0 mm/slub.c:3922 Code: 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 90 0f 0b 90 e9 e7 fe ff ff e8 79 32 1b 09 41 f7 c5 00 02 00 00 74 b2 fb 4d 85 ff <75> b1 eb ba e8 63 32 1b 09 e9 4f fe ff ff 90 0f 0b 90 e9 66 ff ff RSP: 0018:ffffc90003cdf6b0 EFLAGS: 00000246 RAX: e555137316675900 RBX: ffff88813fe27140 RCX: e555137316675900 RDX: 0000000000000007 RSI: ffffffff8d512c0f RDI: ffffffff8b9eea60 RBP: 0000000000000001 R08: ffffffff8f5bed37 R09: 1ffffffff1eb7da6 R10: dffffc0000000000 R11: fffffbfff1eb7da7 R12: 0000000000000000 R13: 0000000000000282 R14: ffff8880b883e810 R15: 0000000000000000 __slab_free+0x2b9/0x390 mm/slub.c:5882 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:352 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4946 [inline] slab_alloc_node mm/slub.c:5245 [inline] kmem_cache_alloc_node_noprof+0x433/0x710 mm/slub.c:5297 __alloc_skb+0x112/0x2d0 net/core/skbuff.c:660 alloc_skb include/linux/skbuff.h:1383 [inline] nlmsg_new include/net/netlink.h:1055 [inline] inet6_netconf_notify_devconf+0x10f/0x1d0 net/ipv6/addrconf.c:593 __addrconf_sysctl_register+0x451/0x4c0 net/ipv6/addrconf.c:7334 addrconf_sysctl_register+0x168/0x1c0 net/ipv6/addrconf.c:7371 ipv6_add_dev+0xd46/0x1370 net/ipv6/addrconf.c:460 addrconf_notify+0x794/0x1010 net/ipv6/addrconf.c:3650 notifier_call_chain+0x1b6/0x3e0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2267 [inline] call_netdevice_notifiers net/core/dev.c:2281 [inline] register_netdevice+0x1608/0x1ae0 net/core/dev.c:11332 tun_set_iff+0x844/0xf00 drivers/net/tun.c:2807 __tun_chr_ioctl+0x788/0x1df0 drivers/net/tun.c:3088 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 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: 0033:0x7f3049f8eec9 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:00007f30481f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f304a1e6090 RCX: 00007f3049f8eec9 RDX: 0000200000000040 RSI: 00000000400454ca RDI: 000000000000000b RBP: 00007f304a011f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f304a1e6128 R14: 00007f304a1e6090 R15: 00007fffae0fe478 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5160 Comm: kworker/u9:1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Workqueue: hci2 hci_cmd_timeout RIP: 0010:info_print_prefix+0x1fd/0x310 kernel/printk/printk.c:1385 Code: c7 c2 c0 81 4b 8b 45 89 e0 e8 7f ad 91 09 4c 89 f7 48 c7 c6 e0 81 4b 8b 48 89 da e8 5d b0 91 09 48 63 c8 49 8d 04 0f 48 ff c0 <49> 01 ce 4c 89 f1 48 c1 e9 03 49 bc 00 00 00 00 00 fc ff df 42 0f RSP: 0018:ffffc9000f547120 EFLAGS: 00000206 RAX: 0000000000000017 RBX: ffffc9000f547160 RCX: 0000000000000008 RDX: 0000000000000000 RSI: 000000007fffffff RDI: 0000000000000000 RBP: ffffc9000f5471d0 R08: ffffc9000f547275 R09: 1ffff92001ea8e4e R10: dffffc0000000000 R11: fffff52001ea8e4f R12: 0000000000000000 R13: ffffc9000f547260 R14: ffffc9000f54726e R15: 000000000000000e FS: 0000000000000000(0000) GS:ffff88812648a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555592a2b5c8 CR3: 0000000079a26000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: record_print_text+0x154/0x420 kernel/printk/printk.c:1429 printk_get_next_message+0x26d/0x7b0 kernel/printk/printk.c:2997 console_emit_next_record kernel/printk/printk.c:3065 [inline] console_flush_all+0x4ca/0xb10 kernel/printk/printk.c:3199 __console_flush_and_unlock kernel/printk/printk.c:3258 [inline] console_unlock+0xbb/0x190 kernel/printk/printk.c:3298 vprintk_emit+0x4c5/0x590 kernel/printk/printk.c:2423 _printk+0xcf/0x120 kernel/printk/printk.c:2448 bt_err+0x10b/0x160 net/bluetooth/lib.c:296 hci_cmd_timeout+0xd8/0x1e0 net/bluetooth/hci_core.c:1469 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3346 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427 kthread+0x70e/0x8a0 kernel/kthread.c:463 ret_from_fork+0x436/0x7d0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245