rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=6917, q=118) rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294953982-4294943479), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.4 R running task 24552 8568 8565 0x0000400a Call Trace: sched_show_task+0x40f/0x560 kernel/sched/core.c:5954 print_other_cpu_stall kernel/rcu/tree_stall.h:410 [inline] check_cpu_stall kernel/rcu/tree_stall.h:538 [inline] rcu_pending kernel/rcu/tree.c:2827 [inline] rcu_sched_clock_irq+0x1861/0x1ad0 kernel/rcu/tree.c:2271 update_process_times+0x12d/0x180 kernel/time/timer.c:1726 tick_sched_handle kernel/time/tick-sched.c:167 [inline] tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1310 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1641 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:free_thread_stack+0x151/0x590 kernel/fork.c:280 Code: 31 f6 e8 02 8d 6f 00 43 80 3c 2e 00 74 08 4c 89 e7 e8 73 94 6a 00 49 8b 1c 24 48 83 c3 08 48 89 d8 48 c1 e8 03 42 80 3c 28 00 <74> 08 48 89 df e8 55 94 6a 00 48 8b 3b be fc ff ff ff e8 28 04 00 RSP: 0018:ffffc900020165e8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffff110146b3731 RBX: ffff8880a359b988 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffea00028cd140 RBP: ffffc90002016620 R08: 000000000003a728 R09: ffffed1014db5341 R10: ffffed1014db5341 R11: 0000000000000000 R12: ffff8880a359ba20 R13: dffffc0000000000 R14: 1ffff110146b3744 R15: ffff8880a6da99f8 release_task_stack kernel/fork.c:440 [inline] put_task_stack+0xa3/0x130 kernel/fork.c:451 finish_task_switch+0x3f1/0x550 kernel/sched/core.c:3256 context_switch kernel/sched/core.c:3388 [inline] __schedule+0x9a8/0xcc0 kernel/sched/core.c:4081 preempt_schedule_irq+0xc1/0x140 kernel/sched/core.c:4338 retint_kernel+0x1b/0x2b RIP: 0010:stack_trace_consume_entry+0x165/0x260 kernel/stacktrace.c:94 Code: 80 3c 20 00 74 08 48 89 df e8 a7 64 4d 00 48 8b 45 b0 48 89 03 45 8b 7d 00 48 b8 00 00 00 00 00 fc ff df 48 8b 4d b8 8a 04 01 <84> c0 0f 85 c7 00 00 00 48 8b 45 c0 8b 18 44 89 ff 89 de e8 f3 fc RSP: 0018:ffffc90002016830 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffffc90002016a60 RCX: 1ffff92000402d27 RDX: 0000000000000018 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90002016880 R08: ffffffff8165c225 R09: ffffc90002016890 R10: fffff52000402d1e R11: 0000000000000000 R12: dffffc0000000000 R13: ffffc90002016940 R14: 0000000000000018 R15: 0000000000000019 arch_stack_walk+0xa8/0xe0 arch/x86/kernel/stacktrace.c:27 stack_trace_save+0xb6/0x150 kernel/stacktrace.c:123 save_stack mm/kasan/common.c:72 [inline] set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc+0x11c/0x1b0 mm/kasan/common.c:513 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527 __do_kmalloc_node mm/slab.c:3616 [inline] __kmalloc_node_track_caller+0x4d/0x60 mm/slab.c:3630 __kmalloc_reserve net/core/skbuff.c:141 [inline] pskb_expand_head+0x117/0x1120 net/core/skbuff.c:1628 netlink_trim+0x1ad/0x250 net/netlink/af_netlink.c:1284 netlink_broadcast_filtered+0x77/0x1170 net/netlink/af_netlink.c:1489 netlink_broadcast net/netlink/af_netlink.c:1534 [inline] nlmsg_multicast include/net/netlink.h:968 [inline] nlmsg_notify+0xfc/0x1f0 net/netlink/af_netlink.c:2520 rtnl_notify+0x9b/0xc0 net/core/rtnetlink.c:737 rtmsg_fib+0x631/0x9c0 net/ipv4/fib_semantics.c:524 fib_table_insert+0x1902/0x1f10 net/ipv4/fib_trie.c:1285 fib_magic+0x438/0x5e0 net/ipv4/fib_frontend.c:1082 fib_add_ifaddr+0x3ea/0x590 net/ipv4/fib_frontend.c:1126 fib_netdev_event+0x75d/0x8b0 net/ipv4/fib_frontend.c:1463 notifier_call_chain kernel/notifier.c:83 [inline] __raw_notifier_call_chain kernel/notifier.c:361 [inline] raw_notifier_call_chain+0xec/0x190 kernel/notifier.c:368 __dev_notify_flags+0x24d/0x4d0 net/core/dev.c:1893 dev_change_flags+0xec/0x190 net/core/dev.c:8179 do_setlink+0xb2e/0x3960 net/core/rtnetlink.c:2591 __rtnl_newlink net/core/rtnetlink.c:3238 [inline] rtnl_newlink+0x14dd/0x1bd0 net/core/rtnetlink.c:3363 rtnetlink_rcv_msg+0x889/0xd40 net/core/rtnetlink.c:5424 netlink_rcv_skb+0x19e/0x3d0 net/netlink/af_netlink.c:2477 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5442 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x767/0x920 net/netlink/af_netlink.c:1328 netlink_sendmsg+0xa31/0xd50 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:639 [inline] sock_sendmsg net/socket.c:659 [inline] __sys_sendto+0x442/0x5e0 net/socket.c:1985 __do_sys_sendto net/socket.c:1997 [inline] __se_sys_sendto net/socket.c:1993 [inline] __x64_sys_sendto+0xe5/0x100 net/socket.c:1993 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x414c43 Code: ff 0f 83 b0 19 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d 2d 38 66 00 00 75 17 49 89 ca b8 2c 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 81 19 00 00 c3 48 83 ec 08 e8 87 fa ff ff RSP: 002b:00007ffff487cb58 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000a72200 RCX: 0000000000414c43 RDX: 000000000000002c RSI: 0000000000a72250 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffff487cb60 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000a72250 R15: 0000000000000003 rcu: rcu_preempt kthread starved for 10580 jiffies! g6917 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 28864 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x9a0/0xcc0 kernel/sched/core.c:4081 schedule+0x181/0x210 kernel/sched/core.c:4155 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1895 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline] rcu_gp_kthread+0xed8/0x1770 kernel/rcu/tree.c:1821 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352