rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=cc5c/1/0x4000000000000000 softirq=29931/29932 fqs=2000 rcu: hardirqs softirqs csw/system rcu: number: 0 0 0 rcu: cputime: 137 45601 8 ==> 45750(ms) rcu: (t=10502 jiffies g=27585 q=3168 ncpus=2) CPU: 0 UID: 0 PID: 10029 Comm: syz.4.1017 Not tainted 6.14.0-rc6-syzkaller-01216-gbfc6c67ec2d6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:__sanitizer_cov_trace_cmp4+0x0/0x90 kernel/kcov.c:287 Code: 10 48 89 74 0a 18 4c 89 44 0a 20 c3 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 4c 8b 04 24 65 48 8b 14 25 c0 d6 03 00 65 8b 05 70 e5 RSP: 0018:ffffc90000006ed8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888029281e00 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90000007140 R08: ffffffff8a01f7cc R09: 1ffffffff28aa939 R10: dffffc0000000000 R11: ffffffff816193c0 R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880562198d0 FS: 0000555580ed7500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb201d88d58 CR3: 000000005c566000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: cake_dequeue+0x5d6/0x4bf0 net/sched/sch_cake.c:2012 dequeue_skb net/sched/sch_generic.c:293 [inline] qdisc_restart net/sched/sch_generic.c:398 [inline] __qdisc_run+0x272/0x2180 net/sched/sch_generic.c:416 __dev_xmit_skb net/core/dev.c:4093 [inline] __dev_queue_xmit+0x10dd/0x3f40 net/core/dev.c:4601 dev_queue_xmit include/linux/netdevice.h:3330 [inline] neigh_hh_output include/net/neighbour.h:523 [inline] neigh_output include/net/neighbour.h:537 [inline] ip_finish_output2+0xcd3/0x12e0 net/ipv4/ip_output.c:236 ip_local_out net/ipv4/ip_output.c:130 [inline] ip_send_skb net/ipv4/ip_output.c:1502 [inline] ip_push_pending_frames+0xbf/0x150 net/ipv4/ip_output.c:1522 __icmp_send+0x12aa/0x17e0 net/ipv4/icmp.c:781 ipv4_send_dest_unreach net/ipv4/route.c:1242 [inline] ipv4_link_failure+0x699/0xaa0 net/ipv4/route.c:1249 dst_link_failure include/net/dst.h:429 [inline] arp_error_report+0x114/0x160 net/ipv4/arp.c:296 neigh_invalidate+0x247/0x470 net/core/neighbour.c:1008 neigh_timer_handler+0x8a5/0xfe0 net/core/neighbour.c:1095 call_timer_fn+0x187/0x650 kernel/time/timer.c:1789 expire_timers kernel/time/timer.c:1840 [inline] __run_timers kernel/time/timer.c:2414 [inline] __run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2426 run_timer_base kernel/time/timer.c:2435 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2445 handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561 __do_softirq kernel/softirq.c:595 [inline] invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0xf7/0x220 kernel/softirq.c:662 irq_exit_rcu+0x9/0x30 kernel/softirq.c:678 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5855 Code: 2b 00 74 08 4c 89 f7 e8 2a 5a 8c 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25 RSP: 0018:ffffc900059a7720 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 1ffff92000b34ef0 RCX: ffff8880292828e8 RDX: dffffc0000000000 RSI: ffffffff8c2ac600 RDI: ffffffff8c810060 RBP: ffffc900059a7880 R08: ffffffff9455484f R09: 1ffffffff28aa909 R10: dffffc0000000000 R11: fffffbfff28aa90a R12: 1ffff92000b34eec R13: dffffc0000000000 R14: ffffc900059a7780 R15: 0000000000000246 local_lock_acquire include/linux/local_lock_internal.h:29 [inline] __radix_tree_preload+0x99/0x860 lib/radix-tree.c:334 idr_preload+0x1b/0x210 lib/radix-tree.c:1471 alloc_pid+0x29d/0xa90 kernel/pid.c:213 copy_process+0x1c43/0x3cf0 kernel/fork.c:2419 kernel_clone+0x226/0x8e0 kernel/fork.c:2815 __do_sys_clone3 kernel/fork.c:3119 [inline] __se_sys_clone3+0x2ee/0x380 kernel/fork.c:3098 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb200fc19c9 Code: ab 08 00 48 8d 3d 5c ab 08 00 e8 02 29 f6 ff 66 90 b8 ea ff ff ff 48 85 ff 74 2c 48 85 d2 74 27 49 89 c8 b8 b3 01 00 00 0f 05 <48> 85 c0 7c 18 74 01 c3 31 ed 48 83 e4 f0 4c 89 c7 ff d2 48 89 c7 RSP: 002b:00007ffe8af2b3a8 EFLAGS: 00000202 ORIG_RAX: 00000000000001b3 RAX: ffffffffffffffda RBX: 00007fb200f43dd0 RCX: 00007fb200fc19c9 RDX: 00007fb200f43dd0 RSI: 0000000000000058 RDI: 00007ffe8af2b3f0 RBP: 00007fb201d886c0 R08: 00007fb201d886c0 R09: 00007ffe8af2b4d7 R10: 0000000000000008 R11: 0000000000000202 R12: ffffffffffffffa8 R13: 000000000000006e R14: 00007ffe8af2b3f0 R15: 00007ffe8af2b4d8