rcu: INFO: rcu_sched detected stalls on CPUs/tasks: rcu: 1-...!: (1 ticks this GP) idle=336/1/0x4000000000000002 softirq=4442/4442 fqs=0 rcu: (detected by 0, t=10002 jiffies, g=1517, q=1798) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3443 Comm: syz-executor.0 Not tainted 5.1.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 RIP: 0010:lock_release+0x0/0x1c0 kernel/locking/lockdep.c:4220 Code: 41 5c 41 5d 41 5e 41 5f 5d c3 e8 3b e7 3f 00 eb c5 4c 89 fa 4c 89 f6 48 89 df e8 0b f6 ff ff eb b5 e8 d4 21 fb ff 0f 1f 40 00 <55> 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 10 65 48 8b 04 25 RSP: 0018:ffff888237b03e68 EFLAGS: 00000002 RAX: 0000000000000000 RBX: ffffffff8358f008 RCX: 0000000000000000 RDX: ffffffff81512809 RSI: 0000000000000001 RDI: ffffffff8358f020 RBP: ffff888237b03e80 R08: 000000002def083b R09: 0000000000000002 R10: 0000000000000000 R11: 0000000000000054 R12: 0000000000000006 R13: ffffffff82879a80 R14: ffffffff8358f008 R15: 0000000000000006 FS: 00007f443353f6c0(0000) GS:ffff888237b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f44349e8da8 CR3: 000000022ed15000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: debug_object_activate lib/debugobjects.c:498 [inline] debug_object_activate+0x159/0x1c0 lib/debugobjects.c:456 debug_hrtimer_activate kernel/time/hrtimer.c:407 [inline] debug_activate kernel/time/hrtimer.c:456 [inline] enqueue_hrtimer+0x20/0xb0 kernel/time/hrtimer.c:945 __run_hrtimer kernel/time/hrtimer.c:1404 [inline] __hrtimer_run_queues+0x281/0x2e0 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0xf1/0x200 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline] smp_apic_timer_interrupt+0x6d/0x160 arch/x86/kernel/apic/apic.c:1060 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:skb_clone+0x0/0xb0 net/core/skbuff.c:1304 Code: 41 5e 41 5f 5d c3 48 c7 c6 48 c2 58 82 e8 f8 17 82 ff 0f 0b 45 31 c9 e9 dc fe ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 <55> 48 85 ff 48 89 e5 41 54 41 89 f4 53 48 89 fb 74 13 8b 87 bc 00 RSP: 0018:ffffc90000e1b928 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000002 RBX: ffff88822f745d00 RCX: 0000000000000004 RDX: 00001ffffffffffe RSI: 0000000000000cc0 RDI: ffff88822f745d00 RBP: ffffc90000e1b950 R08: 0000000000000cc0 R09: 0000000000000000 R10: ffff88822f745d00 R11: 00000000000000d8 R12: 0000000000000d88 R13: 0000000000000cc0 R14: 00000000d40ad1c3 R15: ffff88822ecb8208 netlink_broadcast_filtered+0x35/0x400 net/netlink/af_netlink.c:1498 netlink_broadcast+0xe/0x10 net/netlink/af_netlink.c:1543 rtnetlink_send+0x40/0x80 net/core/rtnetlink.c:718 qdisc_notify.isra.13+0x91/0x120 net/sched/sch_api.c:983 tc_modify_qdisc+0x3cd/0x720 net/sched/sch_api.c:1629 rtnetlink_rcv_msg+0x2ed/0x3f0 net/core/rtnetlink.c:5214 netlink_rcv_skb+0x47/0x110 net/netlink/af_netlink.c:2486 rtnetlink_rcv+0x10/0x20 net/core/rtnetlink.c:5232 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline] netlink_unicast+0x1b0/0x250 net/netlink/af_netlink.c:1337 netlink_sendmsg+0x208/0x3b0 net/netlink/af_netlink.c:1926 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:661 [inline] sock_sendmsg+0x2e/0x40 net/socket.c:656 ___sys_sendmsg+0x285/0x2e0 net/socket.c:2280 __sys_sendmsg+0x57/0xa0 net/socket.c:2318 __do_sys_sendmsg net/socket.c:2327 [inline] __se_sys_sendmsg net/socket.c:2325 [inline] __x64_sys_sendmsg+0x1a/0x20 net/socket.c:2325 do_syscall_64+0x4f/0x140 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f44339bcbe9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f443353f0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f4433adbf80 RCX: 00007f44339bcbe9 RDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000006 RBP: 00007f4433a0847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000006 R14: 00007f4433adbf80 R15: 00007ffddd213d38 rcu: rcu_sched kthread starved for 10002 jiffies! g1517 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_sched I14864 10 2 0x80080000 Call Trace: context_switch kernel/sched/core.c:2877 [inline] __schedule+0x322/0x830 kernel/sched/core.c:3518 schedule+0x27/0x70 kernel/sched/core.c:3562 schedule_timeout+0x1f3/0x4a0 kernel/time/timer.c:1803 rcu_gp_fqs_loop kernel/rcu/tree.c:1971 [inline] rcu_gp_kthread+0x423/0x7f0 kernel/rcu/tree.c:2128 kthread+0x119/0x130 kernel/kthread.c:253 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352