watchdog: BUG: soft lockup - CPU#0 stuck for 122s! [syz.3.4053:18882] Modules linked in: irq event stamp: 12371363 hardirqs last enabled at (12371362): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:310 hardirqs last disabled at (12371363): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050 softirqs last enabled at (2103132): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (2103132): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (2103132): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (2103135): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (2103135): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (2103135): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 18882 Comm: syz.3.4053 Not tainted 6.16.0-rc4-syzkaller-gbf4807c89d8f #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:debug_lockdep_rcu_enabled+0x23/0x40 kernel/rcu/update.c:321 Code: 90 90 90 90 90 90 90 f3 0f 1e fa 31 c0 83 3d 47 a8 32 04 00 74 1e 83 3d 6a d8 32 04 00 74 15 65 48 8b 0c 25 08 10 a0 92 31 c0 <83> b9 ec 0a 00 00 00 0f 94 c0 e9 be d2 02 00 cc cc cc cc cc cc cc RSP: 0018:ffffc90000006b78 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff888021798000 RDX: 0000000000000000 RSI: ffffffff8db84369 RDI: ffffffff8be28f40 RBP: ffffc90000006c78 R08: 0000000000000000 R09: ffffffff81cb8f07 R10: dffffc0000000000 R11: fffff91ffff9c205 R12: ffffe8ffffce1000 R13: 1ffff92000000d7c R14: ffffffff81cb8f07 R15: ffffffff8e00de60 FS: 00007fb7c904c6c0(0000) GS:ffff888125c1f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3720019ad4 CR3: 0000000034950000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300 DR3: 0000000000000000 DR6: 00000000ffff0ff4 DR7: 0000000000000600 Call Trace: rcu_read_lock include/linux/rcupdate.h:842 [inline] trace_call_bpf+0xdd/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:5834 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+0x3e/0x60 mm/kasan/common.c:47 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:548 __call_rcu_common kernel/rcu/tree.c:3094 [inline] call_rcu+0x157/0x9c0 kernel/rcu/tree.c:3214 refdst_drop include/net/dst.h:263 [inline] skb_dst_drop include/net/dst.h:275 [inline] __dev_queue_xmit+0x7f1/0x3a70 net/core/dev.c:4668 dev_queue_xmit include/linux/netdevice.h:3355 [inline] neigh_hh_output include/net/neighbour.h:523 [inline] neigh_output include/net/neighbour.h:537 [inline] ip6_finish_output2+0x11bc/0x16a0 net/ipv6/ip6_output.c:141 __ip6_finish_output net/ipv6/ip6_output.c:-1 [inline] ip6_finish_output+0x234/0x7d0 net/ipv6/ip6_output.c:226 NF_HOOK include/linux/netfilter.h:317 [inline] ndisc_send_skb+0xb47/0x1400 net/ipv6/ndisc.c:513 addrconf_rs_timer+0x369/0x670 net/ipv6/addrconf.c:4041 call_timer_fn+0x17e/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:check_preemption_disabled+0x6/0x120 lib/smp_processor_id.c:13 Code: c7 c6 20 8f e2 8b eb 1c 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 55 41 57 41 56 53 <48> 83 ec 10 65 48 8b 05 1e ce 30 07 48 89 44 24 08 65 8b 05 26 ce RSP: 0018:ffffc900053e6778 EFLAGS: 00000246 RAX: ffff888021798440 RBX: 1ffff110042f3088 RCX: dffffc0000000000 RDX: ffff888021798440 RSI: ffffffff8be28f20 RDI: ffffffff8be28ee0 RBP: ffffc900053e6890 R08: ffffc900053e692f R09: 0000000000000000 R10: ffffc900053e6920 R11: ffffffffa020178c R12: dffffc0000000000 R13: 1ffff92000a7ccfc R14: ffff888021798000 R15: ffff888021798420 migrate_enable+0x249/0x3c0 kernel/sched/core.c:2437 bpf_prog_run_array include/linux/bpf.h:2239 [inline] trace_call_bpf+0x4b9/0x850 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:5834 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 save_stack+0xf5/0x1f0 mm/page_owner.c:156 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:308 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1248 [inline] __free_frozen_pages+0xc71/0xe70 mm/page_alloc.c:2706 discard_slab mm/slub.c:2717 [inline] __put_partials+0x161/0x1c0 mm/slub.c:3186 put_cpu_partial+0x17c/0x250 mm/slub.c:3261 __slab_free+0x2f7/0x400 mm/slub.c:4513 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:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4148 [inline] slab_alloc_node mm/slub.c:4197 [inline] __do_kmalloc_node mm/slub.c:4327 [inline] __kvmalloc_node_noprof+0x2b0/0x5f0 mm/slub.c:5015 kvmalloc_array_node_noprof include/linux/slab.h:1065 [inline] check_cfg+0x105/0x1b00 kernel/bpf/verifier.c:17608 bpf_check+0x57e3/0x19c60 kernel/bpf/verifier.c:24048 bpf_prog_load+0x1318/0x1930 kernel/bpf/syscall.c:2972 __sys_bpf+0x5f1/0x860 kernel/bpf/syscall.c:5836 __do_sys_bpf kernel/bpf/syscall.c:5943 [inline] __se_sys_bpf kernel/bpf/syscall.c:5941 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5941 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: 0033:0x7fb7c818e929 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:00007fb7c904c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fb7c83b5fa0 RCX: 00007fb7c818e929 RDX: 0000000000000048 RSI: 0000200000000080 RDI: 0000000000000005 RBP: 00007fb7c8210b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fb7c83b5fa0 R15: 00007ffca09019f8 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc4-syzkaller-gbf4807c89d8f #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:bpf_prog_83d37dda6cf46a9a+0x0/0x23 Code: 41 5e c9 e9 36 eb 51 eb cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 40 00 00 00 cc cc cc cc cc cc cc cc 0f 1e fa 0f 1f 44 00 00 0f 1f 00 55 48 89 e5 f3 0f 1e fa 41 56 RSP: 0018:ffffc90000a08ad8 EFLAGS: 00000086 RAX: 1ffff92000ac6206 RBX: ffffc90005631048 RCX: dffffc0000000000 RDX: 0000000000010000 RSI: ffffc90005631048 RDI: ffffe8ffffde3000 RBP: ffffc90000a08bd8 R08: ffffc90000a08b6f R09: 0000000000000000 R10: ffffc90000a08b60 R11: ffffffffa020178c R12: ffffc90005631030 R13: ffff8880298bc518 R14: ffff8880298bc528 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888125d1f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f554cf01a90 CR3: 000000006fcf2000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: 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:5834 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xa7/0xf0 kernel/locking/spinlock.c:162 hrtimer_interrupt+0xfa/0xaa0 kernel/time/hrtimer.c:1868 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline] __sysvec_apic_timer_interrupt+0x10b/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 f1 63 1f 00 41 89 df 4d 85 f6 48 8b 1c 24 75 07 e8 e0 63 1f 00 eb 06 e8 d9 63 1f 00 fb 48 c7 c7 a0 30 13 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 b9 36 RSP: 0018:ffffc90000a77ae0 EFLAGS: 00000293 RAX: ffffffff81a0fac7 RBX: ffffffff81a0f984 RCX: ffff88801dafbc00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e1330a0 RBP: ffffc90000a77bf0 R08: ffffffff8fa1d6f7 R09: 1ffffffff1f43ade R10: dffffc0000000000 R11: fffffbfff1f43adf R12: dffffc0000000000 R13: 1ffff9200014ef60 R14: 0000000000000200 R15: 0000000000000041 _printk+0xcf/0x120 kernel/printk/printk.c:2475 check_hung_task kernel/hung_task.c:214 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:298 [inline] watchdog+0xb4f/0x1030 kernel/hung_task.c:470 kthread+0x70e/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