rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 1, t=10502 jiffies, g=65453, q=143) rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294996685-4294986183), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.2 R running task 26016 29438 6616 0x0000000c Call Trace: sched_show_task.cold+0x334/0x395 kernel/sched/core.c:5338 print_other_cpu_stall kernel/rcu/tree.c:1430 [inline] check_cpu_stall kernel/rcu/tree.c:1557 [inline] __rcu_pending kernel/rcu/tree.c:3293 [inline] rcu_pending kernel/rcu/tree.c:3336 [inline] rcu_check_callbacks.cold+0xaf0/0xddc kernel/rcu/tree.c:2682 update_process_times+0x2a/0x70 kernel/time/timer.c:1638 tick_sched_handle.isra.0+0x91/0x180 kernel/time/tick-sched.c:168 tick_sched_timer+0x44/0x130 kernel/time/tick-sched.c:1278 __run_hrtimer kernel/time/hrtimer.c:1401 [inline] __hrtimer_run_queues+0x2ec/0xd20 kernel/time/hrtimer.c:1463 hrtimer_interrupt+0x312/0x770 kernel/time/hrtimer.c:1521 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline] smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1092 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:deref_stack_reg+0x2a/0xe0 arch/x86/kernel/unwind_orc.c:337 Code: 41 55 49 bd 00 00 00 00 00 fc ff df 41 54 49 89 d4 ba 08 00 00 00 55 48 89 f5 53 48 83 ec 60 48 89 e3 48 c7 04 24 b3 8a b5 41 <48> c7 44 24 08 0a 61 68 88 48 c1 eb 03 48 c7 44 24 10 40 f5 2d 81 RSP: 0018:ffff8880ae707698 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: ffff8880ae707698 RCX: ffffffff8a4493d2 RDX: 0000000000000008 RSI: ffff8880ae707cd8 RDI: ffff8880ae7077f8 RBP: ffff8880ae707cd8 R08: 0000000000000001 R09: 0000000000000001 R10: 00000000000f5ff3 R11: 0000000000064061 R12: ffff8880ae707838 R13: dffffc0000000000 R14: ffff8880ae707830 R15: ffff8880ae7077f8 unwind_next_frame+0x1129/0x1b10 arch/x86/kernel/unwind_orc.c:559 __save_stack_trace+0x83/0x100 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc.part.0+0x4f/0xd0 mm/kasan/kasan.c:553 kmem_cache_alloc_node_trace+0x151/0x3b0 mm/slab.c:3668 __do_kmalloc_node mm/slab.c:3688 [inline] __kmalloc_node_track_caller+0x38/0x70 mm/slab.c:3703 __kmalloc_reserve.isra.0+0x39/0xe0 net/core/skbuff.c:137 __alloc_skb+0xef/0x5b0 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:995 [inline] mrp_pdu_init net/802/mrp.c:303 [inline] mrp_pdu_append_vecattr_event+0x76d/0xf60 net/802/mrp.c:402 mrp_attr_event+0x15d/0x220 net/802/mrp.c:497 mrp_mad_event+0x47/0x60 net/802/mrp.c:577 mrp_join_timer+0x33/0x78 net/802/mrp.c:594 call_timer_fn+0x177/0x700 kernel/time/timer.c:1326 expire_timers+0x24f/0x4f0 kernel/time/timer.c:1363 __run_timers kernel/time/timer.c:1684 [inline] run_timer_softirq+0x218/0x660 kernel/time/timer.c:1697 __do_softirq+0x26c/0x93d kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x17b/0x1c0 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:544 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 kernel/kcov.c:97 Code: 48 c7 c7 c0 2d 6e 87 4c 89 25 9c 92 06 0a 41 bc f4 ff ff ff e8 1a a4 eb ff 48 c7 05 86 92 06 0a 00 00 00 00 e9 24 ec ff ff 90 <48> 8b 34 24 65 48 8b 04 25 40 ee 01 00 65 8b 15 fc 52 9a 7e 81 e2 RSP: 0018:ffff8880498a72f0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000002 RBX: ffff888050a13a80 RCX: ffffffff85cd3fb8 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000000 R08: ffff888056c905c0 R09: ffffed1015ce473b R10: ffffed1015ce473a R11: ffff8880ae7239d3 R12: 1ffff11009314e62 R13: ffffffff89654740 R14: ffff888050a13a80 R15: ffff88809170ce58 nf_ct_deliver_cached_events+0x491/0x650 net/netfilter/nf_conntrack_ecache.c:190 nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:64 [inline] ipv4_confirm+0x10a/0x3e0 net/netfilter/nf_conntrack_proto.c:451 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline] nf_hook_slow+0xc5/0x1e0 net/netfilter/core.c:511 nf_hook include/linux/netfilter.h:244 [inline] NF_HOOK_COND include/linux/netfilter.h:277 [inline] ip_output+0x36a/0x5f0 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:447 [inline] ip_local_out+0xaf/0x170 net/ipv4/ip_output.c:124 __ip_queue_xmit+0x85a/0x1b50 net/ipv4/ip_output.c:505 __tcp_transmit_skb+0x1bdb/0x34b0 net/ipv4/tcp_output.c:1146 tcp_transmit_skb net/ipv4/tcp_output.c:1162 [inline] tcp_write_xmit+0x1403/0x4f70 net/ipv4/tcp_output.c:2387 __tcp_push_pending_frames+0xae/0x280 net/ipv4/tcp_output.c:2563 tcp_push_pending_frames include/net/tcp.h:1772 [inline] tcp_data_snd_check net/ipv4/tcp_input.c:5160 [inline] tcp_rcv_established+0x7d1/0x1c30 net/ipv4/tcp_input.c:5652 tcp_v4_do_rcv+0x605/0x8b0 net/ipv4/tcp_ipv4.c:1535 sk_backlog_rcv include/net/sock.h:946 [inline] __release_sock+0x134/0x3a0 net/core/sock.c:2342 __sk_flush_backlog+0x22/0x30 net/core/sock.c:2362 sk_flush_backlog include/net/sock.h:1033 [inline] tcp_sendmsg_locked+0x2657/0x2f90 net/ipv4/tcp.c:1304 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1460 inet_sendmsg+0x12e/0x590 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:632 sock_write_iter+0x283/0x3c0 net/socket.c:901 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x512/0x760 fs/read_write.c:487 vfs_write+0x1f3/0x540 fs/read_write.c:549 ksys_write+0x12b/0x2a0 fs/read_write.c:599 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ca69 Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f5d65d68c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000050d440 RCX: 000000000045ca69 RDX: 00000000c63b9e35 RSI: 00000000200000c0 RDI: 0000000000000006 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000d09 R14: 00000000004cf610 R15: 00007f5d65d696d4