watchdog: BUG: soft lockup - CPU#0 stuck for 141s! [syz.8.3367:18522] Modules linked in: irq event stamp: 11596373 hardirqs last enabled at (11596372): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:199 hardirqs last disabled at (11596373): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050 softirqs last enabled at (394906): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (394906): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (394906): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (394909): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (394909): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (394909): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 18522 Comm: syz.8.3367 Not tainted 6.16.0-syzkaller-ge8d780dcd957 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline] RIP: 0010:rcu_is_watching+0x35/0xb0 kernel/rcu/tree.c:751 Code: 05 d0 be f3 10 e8 bb 90 c9 09 89 c3 83 f8 08 73 65 49 bf 00 00 00 00 00 fc ff df 4c 8d 34 dd d0 ec b9 8d 4c 89 f0 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 f7 e8 5c 76 7c 00 48 c7 c3 58 4f 9b 92 RSP: 0018:ffffc900000068f0 EFLAGS: 00000a06 RAX: 1ffffffff1b73d9a RBX: 0000000000000000 RCX: fec9eabb9cd87900 RDX: ffff88802ff51e00 RSI: ffffffff8be30a60 RDI: ffffffff8be30a20 RBP: ffffc90000006a18 R08: 0000000000000000 R09: ffffffff81caeb27 R10: dffffc0000000000 R11: fffff91ffff962f3 R12: 0000000000000001 R13: 1ffff92000000d30 R14: ffffffff8db9ecd0 R15: dffffc0000000000 FS: 00007fdf2a2326c0(0000) GS:ffff888125c7e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb00c846d58 CR3: 000000001dec6000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rcu_read_unlock+0x1f/0xa0 include/linux/rcupdate.h:869 trace_call_bpf+0x7dd/0x850 kernel/trace/bpf_trace.c:125 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:10891 do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0x335/0x410 include/trace/events/lock.h:24 __do_trace_lock_acquire include/trace/events/lock.h:24 [inline] trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x311/0x360 kernel/locking/lockdep.c:5831 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:841 [inline] class_rcu_constructor include/linux/rcupdate.h:1155 [inline] unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479 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 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2416 [inline] slab_free mm/slub.c:4679 [inline] kmem_cache_free+0x18f/0x400 mm/slub.c:4781 skb_release_data+0x62d/0x7c0 net/core/skbuff.c:1086 skb_release_all net/core/skbuff.c:1151 [inline] __kfree_skb net/core/skbuff.c:1165 [inline] consume_skb+0x9e/0xf0 net/core/skbuff.c:1397 geneve_xmit+0x20d6/0x2b70 drivers/net/geneve.c:1055 __netdev_start_xmit include/linux/netdevice.h:5219 [inline] netdev_start_xmit include/linux/netdevice.h:5228 [inline] xmit_one net/core/dev.c:3827 [inline] dev_hard_start_xmit+0x2d4/0x830 net/core/dev.c:3843 __dev_queue_xmit+0x1b8d/0x3b50 net/core/dev.c:4713 dev_queue_xmit include/linux/netdevice.h:3358 [inline] neigh_hh_output include/net/neighbour.h:531 [inline] neigh_output include/net/neighbour.h:545 [inline] ip6_finish_output2+0x11bc/0x16a0 net/ipv6/ip6_output.c:141 NF_HOOK include/linux/netfilter.h:318 [inline] ndisc_send_skb+0xb54/0x1440 net/ipv6/ndisc.c:512 addrconf_rs_timer+0x369/0x670 net/ipv6/addrconf.c:4037 call_timer_fn+0x17b/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_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_acquire+0x175/0x360 kernel/locking/lockdep.c:5872 Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 ab ae fc 10 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e RSP: 0018:ffffc9000420f020 EFLAGS: 00000206 RAX: fec9eabb9cd87900 RBX: 0000000000000000 RCX: fec9eabb9cd87900 RDX: 0000000000000000 RSI: ffffffff8db664b4 RDI: ffffffff8be30a80 RBP: ffffffff81caeb27 R08: 0000000000000000 R09: ffffffff81caeb27 R10: dffffc0000000000 R11: fffff91ffff8f30a R12: 0000000000000002 R13: ffffffff8e13c5a0 R14: 0000000000000000 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:841 [inline] trace_call_bpf+0xd4/0x850 kernel/trace/bpf_trace.c:-1 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:10891 do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0x335/0x410 include/trace/events/lock.h:24 __do_trace_lock_acquire include/trace/events/lock.h:24 [inline] trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x311/0x360 kernel/locking/lockdep.c:5831 __might_fault+0xcc/0x130 mm/memory.c:6989 _copy_to_iter+0xf3/0x16f0 lib/iov_iter.c:184 copy_to_iter include/linux/uio.h:220 [inline] simple_copy_to_iter net/core/datagram.c:521 [inline] __skb_datagram_iter+0xf8/0x990 net/core/datagram.c:402 skb_copy_datagram_iter+0xc5/0x230 net/core/datagram.c:535 skb_copy_datagram_msg include/linux/skbuff.h:4144 [inline] unix_stream_read_actor+0x6c/0xb0 net/unix/af_unix.c:3135 unix_stream_read_generic+0xac3/0x2480 net/unix/af_unix.c:3058 unix_stream_recvmsg+0x15d/0x1b0 net/unix/af_unix.c:3172 sock_recvmsg_nosec net/socket.c:1065 [inline] sock_recvmsg+0x22c/0x270 net/socket.c:1087 ____sys_recvmsg+0x1c9/0x460 net/socket.c:2834 ___sys_recvmsg+0x1b5/0x510 net/socket.c:2876 __sys_recvmsg net/socket.c:2909 [inline] __do_sys_recvmsg net/socket.c:2915 [inline] __se_sys_recvmsg net/socket.c:2912 [inline] __x64_sys_recvmsg+0x198/0x260 net/socket.c:2912 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: 0033:0x7fdf2938e9a9 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:00007fdf2a232038 EFLAGS: 00000246 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 00007fdf295b5fa0 RCX: 00007fdf2938e9a9 RDX: 0000000040002002 RSI: 0000200000000000 RDI: 0000000000000007 RBP: 00007fdf29410d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fdf295b5fa0 R15: 00007fff02aaf6d8 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 18540 Comm: kworker/u9:1 Not tainted 6.16.0-syzkaller-ge8d780dcd957 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Workqueue: hci3 hci_cmd_timeout RIP: 0010:__lock_is_held kernel/locking/lockdep.c:5601 [inline] RIP: 0010:lock_is_held_type+0xa8/0x190 kernel/locking/lockdep.c:5940 Code: 2a 07 41 83 bd e8 0a 00 00 00 7e 48 4c 89 eb 48 81 c3 f0 0a 00 00 45 31 ff 49 83 ff 31 73 24 48 89 df 4c 89 f6 e8 78 02 00 00 <85> c0 75 2a 49 ff c7 49 63 85 e8 0a 00 00 48 83 c3 28 49 39 c7 7c RSP: 0018:ffffc90000a089f8 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff88802b368af0 RCX: d4ccb317abde7100 RDX: ffff88802b368000 RSI: ffffffff8e13c5a0 RDI: ffff88802b368af0 RBP: 00000000ffffffff R08: 0000000000000000 R09: ffffffff81caeb27 R10: 3e2d735f5f5f5f26 R11: 746e756f63716573 R12: 0000000000000046 R13: ffff88802b368000 R14: ffffffff8e13c5a0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125d7e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efc25177000 CR3: 000000005d4c4000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: trace_call_bpf+0x1ad/0x850 kernel/trace/bpf_trace.c:146 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:10891 do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0x335/0x410 include/trace/events/lock.h:24 __do_trace_lock_acquire include/trace/events/lock.h:24 [inline] trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x311/0x360 kernel/locking/lockdep.c:5831 seqcount_lockdep_reader_access+0xc9/0x1c0 include/linux/seqlock.h:72 ktime_get_update_offsets_now+0x60/0x3d0 kernel/time/timekeeping.c:2550 hrtimer_update_base kernel/time/hrtimer.c:640 [inline] hrtimer_interrupt+0x132/0xaa0 kernel/time/hrtimer.c:1869 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline] __sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1056 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2061 [inline] RIP: 0010:vprintk_emit+0x58f/0x7a0 kernel/printk/printk.c:2449 Code: 85 32 01 00 00 e8 31 7d 1f 00 41 89 df 4d 85 f6 48 8b 1c 24 75 07 e8 20 7d 1f 00 eb 06 e8 19 7d 1f 00 fb 48 c7 c7 40 08 13 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 e9 36 RSP: 0018:ffffc900042cf720 EFLAGS: 00000293 RAX: ffffffff81a038f7 RBX: ffffffff81a037b4 RCX: ffff88802b368000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e130840 RBP: ffffc900042cf830 R08: ffffffff8fa08df7 R09: 1ffffffff1f411be R10: dffffc0000000000 R11: fffffbfff1f411bf R12: dffffc0000000000 R13: 1ffff92000859ee8 R14: 0000000000000200 R15: 0000000000000023 _printk+0xcf/0x120 kernel/printk/printk.c:2475 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:3238 [inline] process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x711/0x8a0 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