watchdog: BUG: soft lockup - CPU#1 stuck for 144s! [syz.0.40:6038] Modules linked in: irq event stamp: 22669173 hardirqs last enabled at (22669172): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:357 hardirqs last disabled at (22669173): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1049 softirqs last enabled at (22649296): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (22649296): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (22649296): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (22649299): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (22649299): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (22649299): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 1 UID: 0 PID: 6038 Comm: syz.0.40 Not tainted 6.15.0-rc4-syzkaller-g358b1c0f56eb #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202 Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 9a c1 45 f6 48 89 df e8 c2 58 46 f6 e8 cd e0 6e f6 fb bf 01 00 00 00 d2 62 38 f6 65 8b 05 bb e4 1c 07 85 c0 74 07 5b c3 cc cc cc cc RSP: 0018:ffffc90000a08c90 EFLAGS: 00000286 RAX: f8710f1198df8f00 RBX: ffff8880b8925540 RCX: f8710f1198df8f00 RDX: 0000000000000000 RSI: ffffffff8d749fcc RDI: 0000000000000001 RBP: ffffc90000a08e10 R08: ffffffff8f7ed377 R09: 1ffffffff1efda6e R10: dffffc0000000000 R11: fffffbfff1efda6f R12: ffff8880b8925540 R13: 1ffff920001411ac R14: ffff88805e6d8dc8 R15: ffffc90000a08d60 FS: 00007fa830f916c0(0000) GS:ffff8881261cc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000002f860000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: expire_timers kernel/time/timer.c:1839 [inline] __run_timers kernel/time/timer.c:2414 [inline] __run_timer_base+0x60a/0x860 kernel/time/timer.c:2426 run_timer_base kernel/time/timer.c:2435 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2445 handle_softirqs+0x283/0x870 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_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0xa3/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:738 RIP: 0010:finish_task_switch+0x26b/0x950 kernel/sched/core.c:5250 Code: 0f 84 3c 01 00 00 48 85 db 0f 85 63 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 ff 83 c6 09 e8 6a 66 35 00 fb 4c 8b 65 c0 <49> 8d bc 24 18 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 RSP: 0018:ffffc9000af2f798 EFLAGS: 00000282 RAX: f8710f1198df8f00 RBX: 0000000000000000 RCX: f8710f1198df8f00 RDX: 0000000000000000 RSI: ffffffff8d749fcc RDI: ffffffff8bc1cde0 RBP: ffffc9000af2f7f0 R08: ffffffff8f7ed377 R09: 1ffffffff1efda6e R10: dffffc0000000000 R11: fffffbfff1efda6f R12: ffff88802f709e00 R13: dffffc0000000000 R14: ffff88802f2cda00 R15: ffff8880b893a6d8 context_switch kernel/sched/core.c:5385 [inline] __schedule+0x16ea/0x4cd0 kernel/sched/core.c:6767 __schedule_loop kernel/sched/core.c:6845 [inline] schedule+0x165/0x360 kernel/sched/core.c:6860 futex_wait_queue+0x14b/0x200 kernel/futex/waitwake.c:369 __futex_wait+0x11e/0x2a0 kernel/futex/waitwake.c:668 futex_wait+0x104/0x360 kernel/futex/waitwake.c:696 do_futex+0x333/0x420 kernel/futex/syscalls.c:102 __do_sys_futex kernel/futex/syscalls.c:179 [inline] __se_sys_futex+0x36f/0x400 kernel/futex/syscalls.c:160 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa83018e969 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:00007fa830f910e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007fa8303b5fa8 RCX: 00007fa83018e969 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fa8303b5fa8 RBP: 00007fa8303b5fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa8303b5fac R13: 0000000000000000 R14: 00007ffe1b406860 R15: 00007ffe1b406948 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 6042 Comm: syz.3.44 Not tainted 6.15.0-rc4-syzkaller-g358b1c0f56eb #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 RIP: 0010:__this_cpu_preempt_check+0x0/0x20 lib/smp_processor_id.c:65 Code: b6 f0 dc f5 eb a7 e8 8f e3 ff ff 66 66 66 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 0f 1e fa 48 89 fe 48 c7 c7 e0 cd c1 8b e9 bd fe ff ff cc cc cc RSP: 0018:ffffc90000004a70 EFLAGS: 00000046 RAX: 4d4df099ab2b819a RBX: 0000000000000006 RCX: 3707b24cbf88f700 RDX: 0000000000000010 RSI: ffffffff8df3b860 RDI: ffffffff8d93512e RBP: ffff88802de32b70 R08: ffffc90000004a57 R09: 0000000000000000 R10: ffffc90000004a40 R11: fffff5200000094b R12: 0000000000000010 R13: 0000000000000010 R14: ffffffff8df3b860 R15: ffff88802de31e00 FS: 00007f9fdb3a36c0(0000) GS:ffff8881260cc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2b6f949095 CR3: 0000000030546000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lockdep_recursion_finish kernel/locking/lockdep.c:472 [inline] lock_release+0x27a/0x3e0 kernel/locking/lockdep.c:5889 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:871 [inline] __perf_event_output kernel/events/core.c:8364 [inline] perf_event_output_forward+0x37f/0x430 kernel/events/core.c:8373 __perf_event_overflow+0x7cc/0xe10 kernel/events/core.c:10249 perf_swevent_overflow kernel/events/core.c:10324 [inline] perf_swevent_event+0x2f4/0x5e0 kernel/events/core.c:-1 perf_tp_event+0x4f6/0x1380 kernel/events/core.c:10869 perf_trace_run_bpf_submit+0xee/0x170 kernel/events/core.c:10793 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x2f8/0x3b0 include/trace/events/lock.h:50 __do_trace_lock_release include/trace/events/lock.h:69 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x3b2/0x3e0 kernel/locking/lockdep.c:5877 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline] _raw_spin_unlock_irqrestore+0x70/0x110 kernel/locking/spinlock.c:194 __run_hrtimer kernel/time/hrtimer.c:1757 [inline] __hrtimer_run_queues+0x408/0xc60 kernel/time/hrtimer.c:1825 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_acquire+0x77/0x360 kernel/locking/lockdep.c:5831 Code: 00 89 c0 48 0f a3 05 58 c7 e0 0d 73 16 e8 e1 d9 08 00 84 c0 75 0d f6 05 f6 bd ca 0d 01 0f 84 d7 01 00 00 83 3d 19 f6 e0 0d 00 <0f> 84 f0 00 00 00 48 8b b4 24 90 00 00 00 4c 89 ef e8 d3 7c 83 00 RSP: 0018:ffffc90000005680 EFLAGS: 00000202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 3707b24cbf88f700 RDX: 0000000000000000 RSI: ffffffff8bc1cdc0 RDI: ffffffff8bc1cd80 RBP: ffffffff81eebadf R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffffff81eeba50 R12: 0000000000000002 R13: ffffffff8df3b860 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:841 [inline] __perf_event_output kernel/events/core.c:8350 [inline] perf_event_output_forward+0xb0/0x430 kernel/events/core.c:8373 __perf_event_overflow+0x7cc/0xe10 kernel/events/core.c:10249 perf_swevent_overflow kernel/events/core.c:10324 [inline] perf_swevent_event+0x2f4/0x5e0 kernel/events/core.c:-1 perf_tp_event+0x4f6/0x1380 kernel/events/core.c:10869 perf_trace_run_bpf_submit+0xee/0x170 kernel/events/core.c:10793 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x2f8/0x3b0 include/trace/events/lock.h:50 __do_trace_lock_release include/trace/events/lock.h:69 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x3b2/0x3e0 kernel/locking/lockdep.c:5877 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:871 [inline] class_rcu_destructor include/linux/rcupdate.h:1155 [inline] unwind_next_frame+0x19a9/0x2390 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: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:2398 [inline] slab_free mm/slub.c:4656 [inline] kmem_cache_free+0x192/0x3f0 mm/slub.c:4758 packet_rcv+0x175/0x1590 net/packet/af_packet.c:2277 dev_queue_xmit_nit+0xc35/0xcc0 net/core/dev.c:2533 xmit_one net/core/dev.c:3772 [inline] dev_hard_start_xmit+0x1d5/0x880 net/core/dev.c:3792 sch_direct_xmit+0x241/0x4b0 net/sched/sch_generic.c:343 __dev_xmit_skb net/core/dev.c:4018 [inline] __dev_queue_xmit+0x17b6/0x3a70 net/core/dev.c:4595 dev_queue_xmit include/linux/netdevice.h:3350 [inline] neigh_hh_output include/net/neighbour.h:523 [inline] neigh_output include/net/neighbour.h:537 [inline] ip_finish_output2+0xd03/0x1160 net/ipv4/ip_output.c:235 ip_local_out net/ipv4/ip_output.c:129 [inline] __ip_queue_xmit+0x1101/0x1b00 net/ipv4/ip_output.c:527 __tcp_transmit_skb+0x225c/0x36c0 net/ipv4/tcp_output.c:1479 tcp_rcv_established+0x12ff/0x1d10 net/ipv4/tcp_input.c:6275 tcp_v4_do_rcv+0xa23/0xce0 net/ipv4/tcp_ipv4.c:1925 tcp_v4_rcv+0x266e/0x2ef0 net/ipv4/tcp_ipv4.c:2363 ip_protocol_deliver_rcu+0x221/0x440 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x2fb/0x580 net/ipv4/ip_input.c:233 NF_HOOK+0x309/0x3a0 include/linux/netfilter.h:314 dst_input include/net/dst.h:469 [inline] ip_sublist_rcv_finish+0x21d/0x2a0 net/ipv4/ip_input.c:578 ip_list_rcv_finish net/ipv4/ip_input.c:627 [inline] ip_sublist_rcv+0x6e7/0x9b0 net/ipv4/ip_input.c:635 ip_list_rcv+0x3e2/0x430 net/ipv4/ip_input.c:669 __netif_receive_skb_list_ptype net/core/dev.c:5930 [inline] __netif_receive_skb_list_core+0x571/0x800 net/core/dev.c:5967 __netif_receive_skb_list net/core/dev.c:6029 [inline] netif_receive_skb_list_internal+0x975/0xcc0 net/core/dev.c:6120 gro_normal_list include/net/gro.h:532 [inline] napi_complete_done+0x2f2/0x7c0 net/core/dev.c:6490 virtqueue_napi_complete drivers/net/virtio_net.c:737 [inline] virtnet_poll+0x2385/0x2d70 drivers/net/virtio_net.c:3053 __napi_poll+0xc4/0x480 net/core/dev.c:7324 napi_poll net/core/dev.c:7388 [inline] net_rx_action+0x6ea/0xdf0 net/core/dev.c:7510 handle_softirqs+0x283/0x870 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:1049 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline] RIP: 0010:write_comp_data kernel/kcov.c:245 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x8/0x90 kernel/kcov.c:314 Code: 48 89 44 11 20 c3 cc cc cc cc cc 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 14 25 08 40 75 92 65 8b 0d 08 7d b5 10 81 e1 00 01 ff 00 RSP: 0018:ffffc9000b2876b8 EFLAGS: 00000282 RAX: ffffffff81c91d2f RBX: 000000000000002c RCX: 3707b24cbf88f700 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000008 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff825af84c R12: ffffffff8d96dc10 R13: dffffc0000000000 R14: 0000607ed9bd5000 R15: 0000000000000000 perf_trace_buf_alloc+0x18f/0x2a0 kernel/trace/trace_event_perf.c:416 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x18d/0x3b0 include/trace/events/lock.h:50 __do_trace_lock_release include/trace/events/lock.h:69 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x3b2/0x3e0 kernel/locking/lockdep.c:5877 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:871 [inline] class_rcu_destructor include/linux/rcupdate.h:1155 [inline] kernfs_root+0x1e5/0x230 fs/kernfs/kernfs-internal.h:78 kernfs_root_is_locked fs/kernfs/kernfs-internal.h:107 [inline] kernfs_rcu_name fs/kernfs/kernfs-internal.h:112 [inline] kernfs_sd_compare fs/kernfs/dir.c:349 [inline] kernfs_link_sibling+0xe6/0x3e0 fs/kernfs/dir.c:380 kernfs_add_one+0x1e0/0x520 fs/kernfs/dir.c:810 __kernfs_create_file+0x22b/0x2e0 fs/kernfs/file.c:1067 cgroup_add_file kernel/cgroup/cgroup.c:4290 [inline] cgroup_addrm_files+0x7f2/0xb20 kernel/cgroup/cgroup.c:4344 css_populate_dir+0x123/0x3c0 kernel/cgroup/cgroup.c:1774 cgroup_apply_control_enable+0x63c/0xb10 kernel/cgroup/cgroup.c:3290 cgroup_mkdir+0x9eb/0xbc0 kernel/cgroup/cgroup.c:5886 kernfs_iop_mkdir+0x20b/0x350 fs/kernfs/dir.c:1266 vfs_mkdir+0x303/0x510 fs/namei.c:4359 do_mkdirat+0x247/0x590 fs/namei.c:4392 __do_sys_mkdirat fs/namei.c:4409 [inline] __se_sys_mkdirat fs/namei.c:4407 [inline] __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4407 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9fda58e969 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:00007f9fdb3a3038 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f9fda7b5fa0 RCX: 00007f9fda58e969 RDX: 00000000000001ff RSI: 0000200000000000 RDI: ffffffffffffff9c RBP: 00007f9fda610ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f9fda7b5fa0 R15: 00007ffc5067ca58