watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz.8.457:7798] Modules linked in: irq event stamp: 12698491 hardirqs last enabled at (12698490): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:357 hardirqs last disabled at (12698491): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1049 softirqs last enabled at (12689934): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (12689934): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (12689934): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (12689937): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (12689937): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (12689937): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 7798 Comm: syz.8.457 Not tainted 6.15.0-rc4-syzkaller-gc8ce7db0ca83 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:217 [inline] RIP: 0010:unwind_next_frame+0x214/0x2390 arch/x86/kernel/unwind_orc.c:494 Code: ef 08 8b 15 be 45 25 0c 8d 42 ff 44 39 f8 0f 86 65 18 00 00 44 89 f8 4c 8d 2c 85 14 34 b8 90 4c 89 e8 48 c1 e8 03 0f b6 04 28 <84> c0 48 89 eb 0f 85 1c 1c 00 00 45 8b 6d 00 44 89 f8 ff c0 48 8d RSP: 0018:ffffc90000006778 EFLAGS: 00000a06 RAX: 0000000000000000 RBX: 0000000000000001 RCX: c9b1378bcb455d00 RDX: 00000000000a598b RSI: ffffffff8bc1d000 RDI: ffffffff8bc1cfc0 RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff817199f5 R12: ffffffff8b56bd31 R13: ffffffff90e18f08 R14: ffffc90000006848 R15: 00000000000a56bd FS: 00007f283dc366c0(0000) GS:ffff8881260cc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000564132f1e198 CR3: 000000005b48c000 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 mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4161 [inline] slab_alloc_node mm/slub.c:4210 [inline] kmem_cache_alloc_node_noprof+0x1bb/0x3c0 mm/slub.c:4262 kmalloc_reserve+0xbd/0x290 net/core/skbuff.c:577 __alloc_skb+0x142/0x2d0 net/core/skbuff.c:668 alloc_skb include/linux/skbuff.h:1340 [inline] __tcp_send_ack+0xaf/0x620 net/ipv4/tcp_output.c:4254 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+0x7d2/0x800 net/core/dev.c:5977 __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_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:raw_spin_rq_unlock_irq+0x13/0x90 kernel/sched/sched.h:1526 Code: cc e8 41 ec c2 09 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 41 56 53 66 90 e8 84 6f c5 09 e8 ef 51 34 00 fb 5b <41> 5e 41 5f c3 cc cc cc cc cc f3 0f 1e fa 49 be 00 00 00 00 00 fc RSP: 0018:ffffc900033af908 EFLAGS: 00000286 RAX: c9b1378bcb455d00 RBX: ffff888026196180 RCX: c9b1378bcb455d00 RDX: 0000000000000000 RSI: ffffffff8d74a4de RDI: ffffffff8bc1d020 RBP: ffffc900033afb30 R08: ffffffff8f7ed277 R09: 1ffffffff1efda4e R10: dffffc0000000000 R11: fffffbfff1efda4f R12: ffff888026195a00 R13: dffffc0000000000 R14: ffff888026195a00 R15: ffff8880b8839b40 __schedule+0x1932/0x4cd0 kernel/sched/core.c:6771 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7090 irqentry_exit+0x6f/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:percpu_ref_get_many+0x0/0x140 include/linux/percpu-refcount.h:199 Code: 89 f7 49 89 cd 44 89 c5 e8 9d 8b f7 ff 41 89 e8 4c 89 e9 eb 92 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <41> 57 41 56 41 54 53 49 89 f6 49 89 ff e8 fe 71 7d ff 48 8d 1d 00 RSP: 0018:ffffc900033afca0 EFLAGS: 00000206 RAX: 000000000000000a RBX: 0000000000000001 RCX: 000000000000000a RDX: 0000000078924e01 RSI: 0000000000000001 RDI: ffff88805d1d9900 RBP: 1ffffd40003cba87 R08: ffffc900033af74f R09: 0000000000000000 R10: ffffc900033af740 R11: ffffffffa0000994 R12: ffff88805d1d9900 R13: 0000000000000005 R14: ffffea0001e5d400 R15: dffffc0000000000 percpu_ref_get include/linux/percpu-refcount.h:222 [inline] obj_cgroup_get include/linux/memcontrol.h:760 [inline] __memcg_slab_post_alloc_hook+0x458/0x820 mm/memcontrol.c:3080 memcg_slab_post_alloc_hook mm/slub.c:2197 [inline] slab_post_alloc_hook mm/slub.c:4171 [inline] slab_alloc_node mm/slub.c:4210 [inline] kmem_cache_alloc_lru_noprof+0x2c7/0x3d0 mm/slub.c:4229 sock_alloc_inode+0x28/0xc0 net/socket.c:309 alloc_inode+0x67/0x1b0 fs/inode.c:346 new_inode_pseudo include/linux/fs.h:3309 [inline] sock_alloc net/socket.c:622 [inline] __sock_create+0x12d/0x9f0 net/socket.c:1505 sock_create net/socket.c:1599 [inline] __sys_socketpair+0x23a/0x560 net/socket.c:1750 __do_sys_socketpair net/socket.c:1799 [inline] __se_sys_socketpair net/socket.c:1796 [inline] __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1796 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: 0033:0x7f283cd8e969 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:00007f283dc36038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffda RBX: 00007f283cfb5fa0 RCX: 00007f283cd8e969 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 RBP: 00007f283ce10ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 00002000000000c0 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f283cfb5fa0 R15: 00007ffca340b058 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 7811 Comm: kworker/u8:16 Not tainted 6.15.0-rc4-syzkaller-gc8ce7db0ca83 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:check_kcov_mode kernel/kcov.c:194 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x70 kernel/kcov.c:217 Code: 08 40 75 92 65 8b 15 48 81 b5 10 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 3c 16 00 00 00 74 2c 8b 91 18 16 00 00 <83> fa 02 75 21 48 8b 91 20 16 00 00 48 8b 32 48 8d 7e 01 8b 89 1c RSP: 0000:ffffc90003f276f8 EFLAGS: 00000246 RAX: ffffffff81b45620 RBX: ffff8880b893ad40 RCX: ffff888029693c00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90003f27860 R08: ffffffff8f7ed277 R09: 1ffffffff1efda4e R10: dffffc0000000000 R11: fffffbfff1efda4f R12: 1ffff11017108245 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b8841228 FS: 0000000000000000(0000) GS:ffff8881261cc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6417ecd030 CR3: 000000000dd36000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: csd_lock_wait kernel/smp.c:340 [inline] smp_call_function_many_cond+0xe80/0x11c0 kernel/smp.c:885 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2455 [inline] text_poke_bp_batch+0x319/0x940 arch/x86/kernel/alternative.c:2665 text_poke_flush arch/x86/kernel/alternative.c:2856 [inline] text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2863 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x128/0x250 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate+0xad/0x240 mm/kfence/core.c:850 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245