watchdog: BUG: soft lockup - CPU#0 stuck for 26s! [syz-executor.4:5320] Modules linked in: irq event stamp: 2258249 hardirqs last enabled at (2258248): [] asm_sysvec_apic_timer_interrupt+0x1a/0x20 hardirqs last disabled at (2258249): [] sysvec_apic_timer_interrupt+0xf/0x90 softirqs last enabled at (6220): [] irq_exit_rcu+0x93/0xc0 softirqs last disabled at (6223): [] irq_exit_rcu+0x93/0xc0 CPU: 0 PID: 5320 Comm: syz-executor.4 Not tainted 6.5.0-rc1-next-20230714 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:___slab_alloc+0x227/0x1190 Code: 85 88 06 00 00 49 c7 46 28 00 00 00 00 48 c7 c6 22 20 81 81 4c 89 f7 e8 e7 a2 ac ff 48 83 bd 68 ff ff ff 00 0f 85 e1 01 00 00 <49> 83 7f 18 00 0f 84 5d 03 00 00 9c 5b fa 81 e3 00 02 00 00 0f 85 RSP: 0018:ffff88806ce085b0 EFLAGS: 00000206 RAX: 0000000000216dfa RBX: 0000000000000000 RCX: ffffffff812d209f RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8181222d RBP: ffff88806ce08670 R08: 0000000000000001 R09: fffffbfff0efa772 R10: ffffffff877d3b97 R11: 0000000000000001 R12: ffff88800844f780 R13: 0000000000000000 R14: ffff88806ce3de60 R15: ffff88806ce3de40 FS: 00007fbfc3385700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000100000000 CR3: 0000000043d5c000 CR4: 0000000000350ef0 Call Trace: kmem_cache_alloc+0x367/0x390 __create_object+0x3c/0xc90 kmem_cache_alloc+0x21f/0x390 skb_clone+0x172/0x3c0 dev_queue_xmit_nit+0x39c/0xbb0 dev_hard_start_xmit+0xa7/0x6b0 sch_direct_xmit+0x263/0x800 __dev_queue_xmit+0x142d/0x36c0 ip_finish_output2+0x143f/0x20f0 __ip_finish_output.part.0+0x566/0xd20 ip_output+0x2e5/0x8e0 ip_local_out+0x357/0x4c0 __ip_queue_xmit+0x876/0x1ae0 __tcp_transmit_skb+0x2c02/0x3760 __tcp_retransmit_skb+0x657/0x2490 tcp_retransmit_skb+0x2c/0x240 tcp_xmit_retransmit_queue.part.0+0x3fa/0x940 tcp_xmit_retransmit_queue+0x5b/0x70 tcp_xmit_recovery+0x86/0x180 tcp_ack+0x269f/0x54b0 tcp_rcv_established+0x1806/0x1f80 tcp_v4_do_rcv+0x6c8/0xb40 tcp_v4_rcv+0x2bbd/0x3350 ip_protocol_deliver_rcu+0xba/0x490 ip_local_deliver_finish+0x2f2/0x510 ip_local_deliver+0x1bb/0x210 ip_sublist_rcv_finish+0x274/0x570 ip_list_rcv_finish.constprop.0+0x3ab/0x530 ip_list_rcv+0x2bd/0x3b0 __netif_receive_skb_list_core+0x695/0x8d0 netif_receive_skb_list_internal+0x6d0/0xce0 napi_gro_receive+0x836/0xa20 e1000_clean_rx_irq+0x5f8/0x1130 e1000_clean+0x968/0x2510 __napi_poll+0xbd/0x6b0 net_rx_action+0x8a3/0xc40 __do_softirq+0x1b7/0x7d4 irq_exit_rcu+0x93/0xc0 sysvec_apic_timer_interrupt+0x6e/0x90 asm_sysvec_apic_timer_interrupt+0x1a/0x20 RIP: 0010:generic_exec_single+0x90/0x540 Code: 76 95 92 04 0f 92 c3 31 ff 89 de e8 1a e2 0a 00 84 db 0f 84 f4 03 00 00 e8 cd e6 0a 00 4c 89 e6 89 ef 45 31 e4 e8 10 fb ff ff bb e6 0a 00 44 89 e0 5b 5d 41 5c 41 5d 41 5e e9 eb 4c 14 03 e8 RSP: 0018:ffff8880368a7b10 EFLAGS: 00000202 RAX: 000000000000053d RBX: 0000000000000200 RCX: ffffffff812d209f RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff81419347 RBP: 0000000000000001 R08: 0000000000000001 R09: fffffbfff0efa776 R10: ffffffff877d3bb7 R11: 0000000000000001 R12: 0000000000000000 R13: ffff8880368a7c38 R14: ffff8880368a7b88 R15: ffff8880447db694 smp_call_function_single+0x327/0x410 task_function_call+0xe5/0x180 perf_install_in_context+0x2cb/0x570 __do_sys_perf_event_open+0x18bf/0x2a60 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 RIP: 0033:0x7fbfc5e0fb19 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fbfc3385188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007fbfc5f22f60 RCX: 00007fbfc5e0fb19 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000000020000580 RBP: 00007fbfc5e69f6d R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff7997a7bf R14: 00007fbfc3385300 R15: 0000000000022000 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at default_idle+0xf/0x20 loop6: detected capacity change from 0 to 4 EXT4-fs (loop6): unsupported inode size: 0 EXT4-fs (loop6): blocksize: 1024 ---------------- Code disassembly (best guess): 0: 85 88 06 00 00 49 test %ecx,0x49000006(%rax) 6: c7 46 28 00 00 00 00 movl $0x0,0x28(%rsi) d: 48 c7 c6 22 20 81 81 mov $0xffffffff81812022,%rsi 14: 4c 89 f7 mov %r14,%rdi 17: e8 e7 a2 ac ff callq 0xffaca303 1c: 48 83 bd 68 ff ff ff cmpq $0x0,-0x98(%rbp) 23: 00 24: 0f 85 e1 01 00 00 jne 0x20b * 2a: 49 83 7f 18 00 cmpq $0x0,0x18(%r15) <-- trapping instruction 2f: 0f 84 5d 03 00 00 je 0x392 35: 9c pushfq 36: 5b pop %rbx 37: fa cli 38: 81 e3 00 02 00 00 and $0x200,%ebx 3e: 0f .byte 0xf 3f: 85 .byte 0x85