rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (3 ticks this GP) idle=d28c/1/0x4000000000000000 softirq=33076/33076 fqs=4 rcu: (detected by 1, t=10506 jiffies, g=28713, q=408 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 11459 Comm: syz.2.1564 Not tainted 6.14.0-syzkaller-05901-gf278b6d5bb46 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:__raw_spin_lock include/linux/spinlock_api_smp.h:134 [inline] RIP: 0010:_raw_spin_lock+0x36/0x40 kernel/locking/spinlock.c:154 Code: 00 e8 4e bd 69 f5 48 8d 7b 18 31 f6 31 d2 31 c9 41 b8 01 00 00 00 45 31 c9 ff 74 24 08 e8 22 20 78 f5 48 83 c4 08 48 89 df 5b e5 d4 78 f5 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90000007c68 EFLAGS: 00000096 RAX: c7969e5ec0ff2500 RBX: ffff888061ec8036 RCX: c7969e5ec0ff2500 RDX: 0000000000000001 RSI: ffffffff8e4dd585 RDI: ffff88803288f2e8 RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000002 R13: ffffffff8a1a71c0 R14: ffff88803288f340 R15: ffff88804c42e4d8 FS: 00007f84510326c0(0000) GS:ffff888124fea000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2cbfa5 CR3: 000000005b318000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: spin_lock include/linux/spinlock.h:351 [inline] advance_sched+0xab/0xca0 net/sched/sch_taprio.c:924 __run_hrtimer kernel/time/hrtimer.c:1791 [inline] __hrtimer_run_queues+0x5a6/0xd40 kernel/time/hrtimer.c:1855 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1917 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xd9/0x140 kernel/locking/spinlock.c:194 Code: 9c 8f 44 24 20 42 80 3c 2b 00 74 08 4c 89 f7 e8 cd cb 04 f6 f6 44 24 21 02 75 55 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 a2 ba 69 f5 65 8b 05 cb 7e 3c 07 85 c0 74 46 48 c7 04 24 0e 36 RSP: 0018:ffffc9001acdede0 EFLAGS: 00000206 RAX: c7969e5ec0ff2500 RBX: 1ffff9200359bdc0 RCX: 0000000000000002 RDX: 0000000000000002 RSI: ffffffff8e67a33b RDI: 0000000000000001 RBP: ffffc9001acdee70 R08: ffffffff905e4677 R09: 1ffffffff20bc8ce R10: dffffc0000000000 R11: fffffbfff20bc8cf R12: 1ffff9200359bdbc R13: dffffc0000000000 R14: ffffc9001acdee00 R15: 0000000000000246 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] taprio_change+0x350d/0x44f0 net/sched/sch_taprio.c:1972 taprio_init+0xa0f/0xcc0 net/sched/sch_taprio.c:2112 qdisc_create+0x70b/0xdf0 net/sched/sch_api.c:1332 __tc_modify_qdisc net/sched/sch_api.c:1757 [inline] tc_modify_qdisc+0x156d/0x2610 net/sched/sch_api.c:1821 rtnetlink_rcv_msg+0x7c2/0xd70 net/core/rtnetlink.c:6964 netlink_rcv_skb+0x208/0x480 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x7f8/0x9a0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8c3/0xcd0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:727 ____sys_sendmsg+0x523/0x860 net/socket.c:2566 ___sys_sendmsg net/socket.c:2620 [inline] __sys_sendmsg+0x271/0x360 net/socket.c:2652 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f845018d169 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8451032038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f84503a5fa0 RCX: 00007f845018d169 RDX: 0000000000000000 RSI: 00002000000007c0 RDI: 0000000000000004 RBP: 00007f845020e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f84503a5fa0 R15: 00007fffbe5e1588 rcu: rcu_preempt kthread starved for 10488 jiffies! g28713 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R running task stack:26688 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5366 [inline] __schedule+0x1b18/0x50e0 kernel/sched/core.c:6747 __schedule_loop kernel/sched/core.c:6824 [inline] schedule+0x163/0x360 kernel/sched/core.c:6839 schedule_timeout+0x15b/0x290 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x2e1/0x1340 kernel/rcu/tree.c:2046 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2248 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 rcu: Stack dump where RCU GP kthread last ran: CPU: 1 UID: 0 PID: 5834 Comm: syz-executor Not tainted 6.14.0-syzkaller-05901-gf278b6d5bb46 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline] RIP: 0010:smp_call_function_many_cond+0x1bac/0x2d40 kernel/smp.c:885 Code: 03 84 c0 75 7e 45 8b 65 00 44 89 e6 83 e6 01 31 ff e8 b8 02 0c 00 41 83 e4 01 4c 8b 64 24 68 75 07 e8 68 fe 0b 00 eb 41 f3 90 <48> b8 00 00 00 00 00 fc ff df 0f b6 04 03 84 c0 75 11 41 f7 45 00 RSP: 0018:ffffc90003f474c0 EFLAGS: 00000293 RAX: ffffffff81b7791d RBX: 1ffff110170c820d RCX: ffff888064aabc00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90003f476c0 R08: ffffffff81b778e8 R09: 1ffffffff20bc8ce R10: dffffc0000000000 R11: fffffbfff20bc8cf R12: ffff8880b873ad08 R13: ffff8880b8641068 R14: ffff8880b873ad00 R15: 0000000000000000 FS: 0000555576569500(0000) GS:ffff8881250ea000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000006527a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline] flush_tlb_multi arch/x86/mm/tlb.c:1275 [inline] flush_tlb_mm_range+0xb8d/0x13f0 arch/x86/mm/tlb.c:1365 dup_mmap kernel/fork.c:787 [inline] dup_mm kernel/fork.c:1700 [inline] copy_mm+0x18c5/0x2170 kernel/fork.c:1752 copy_process+0x17de/0x3d10 kernel/fork.c:2395 kernel_clone+0x242/0x930 kernel/fork.c:2810 __do_sys_clone kernel/fork.c:2953 [inline] __se_sys_clone kernel/fork.c:2937 [inline] __x64_sys_clone+0x268/0x2e0 kernel/fork.c:2937 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f76f8f839d3 Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00 RSP: 002b:00007ffe173881b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f76f8f839d3 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: 00005555765697d0 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000000927c0 R14: 000000000002b796 R15: 00007ffe17388350 hrtimer: interrupt took 114072970533 ns net_ratelimit: 12 callbacks suppressed batman_adv: batadv0: Local translation table size (72) exceeds maximum packet size (-320); Ignoring new local tt entry: aa:aa:aa:aa:aa:17