rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=8be4/1/0x4000000000000000 softirq=37826/37830 fqs=5237 rcu: hardirqs softirqs csw/system rcu: number: 16 0 0 rcu: cputime: 173 52316 8 ==> 52510(ms) rcu: (t=10503 jiffies g=30273 q=2556 ncpus=2) CPU: 0 UID: 0 PID: 10098 Comm: syz.1.1088 Not tainted 6.15.0-rc1-syzkaller-00178-gf0433eea4688 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:taprio_next_tc_txq net/sched/sch_taprio.c:763 [inline] RIP: 0010:taprio_dequeue_tc_priority+0x215/0x7a0 net/sched/sch_taprio.c:790 Code: 00 45 0f b7 37 4d 89 ef 49 c1 ef 03 43 0f b6 04 27 84 c0 0f 85 25 01 00 00 0f b7 db 41 8b 6d 00 ff c5 41 01 de 89 ef 44 89 f6 c6 86 9c f7 44 39 f5 0f 44 eb 43 0f b6 04 27 84 c0 0f 85 1a 01 RSP: 0018:ffffc90000007220 EFLAGS: 00000206 RAX: 0000000000000000 RBX: 0000000000000008 RCX: ffff88806e73da00 RDX: 0000000000000100 RSI: 000000000000000c RDI: 000000000000000a RBP: 000000000000000a R08: ffffffff8a26e71f R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff8a18a820 R12: dffffc0000000000 R13: ffff888061965394 R14: 000000000000000c R15: 1ffff1100c32ca72 FS: 0000000000000000(0000) GS:ffff888124f94000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f04be7a0440 CR3: 000000000eb38000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: taprio_dequeue+0x186/0x550 net/sched/sch_taprio.c:-1 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:4085 [inline] __dev_queue_xmit+0x10e2/0x3f60 net/core/dev.c:4593 neigh_output include/net/neighbour.h:539 [inline] ip6_finish_output2+0x1296/0x1750 net/ipv6/ip6_output.c:141 __ip6_finish_output net/ipv6/ip6_output.c:-1 [inline] ip6_finish_output+0x421/0x840 net/ipv6/ip6_output.c:226 NF_HOOK include/linux/netfilter.h:314 [inline] ndisc_send_skb+0xb58/0x1560 net/ipv6/ndisc.c:513 addrconf_rs_timer+0x380/0x680 net/ipv6/addrconf.c:4038 call_timer_fn+0x189/0x650 kernel/time/timer.c:1789 expire_timers kernel/time/timer.c:1840 [inline] __run_timers kernel/time/timer.c:2414 [inline] __run_timer_base+0x66e/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+0x2d6/0x9b0 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xfb/0x220 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 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:check_kcov_mode kernel/kcov.c:194 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x70 kernel/kcov.c:217 Code: 08 c0 68 93 65 8b 15 a8 5a a5 11 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 3c 16 00 00 00 74 2c 8b 91 18 16 00 00 <83> fa 02 75 21 48 8b 91 20 16 00 00 48 8b 32 48 8d 7e 01 8b 89 1c RSP: 0018:ffffc90019d47198 EFLAGS: 00000246 RAX: ffffffff822462d0 RBX: 0000000000000000 RCX: ffff88806e73da00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90019d47428 R08: ffffffff822462bc R09: 1ffffd4000376748 R10: dffffc0000000000 R11: fffff94000376749 R12: ffffc90019d47200 R13: 0000000000000032 R14: ffff888054c811a0 R15: dffffc0000000000 free_pages_and_swap_cache+0x260/0x6a0 mm/swap_state.c:262 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:397 [inline] tlb_flush_mmu+0x3a9/0x690 mm/mmu_gather.c:404 zap_pte_range mm/memory.c:1770 [inline] zap_pmd_range mm/memory.c:1823 [inline] zap_pud_range mm/memory.c:1852 [inline] zap_p4d_range mm/memory.c:1873 [inline] unmap_page_range+0x3a84/0x44d0 mm/memory.c:1894 unmap_vmas+0x3ce/0x5f0 mm/memory.c:1984 exit_mmap+0x2bc/0xde0 mm/mmap.c:1284 __mmput+0x115/0x420 kernel/fork.c:1379 exit_mm+0x221/0x310 kernel/exit.c:589 do_exit+0x994/0x27f0 kernel/exit.c:940 do_group_exit+0x207/0x2c0 kernel/exit.c:1102 __do_sys_exit_group kernel/exit.c:1113 [inline] __se_sys_exit_group kernel/exit.c:1111 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1111 x64_sys_call+0x26c3/0x26d0 arch/x86/include/generated/asm/syscalls_64.h:232 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: 0033:0x7f421b18d169 Code: Unable to access opcode bytes at 0x7f421b18d13f. RSP: 002b:00007ffc100d8a98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f421b18d169 RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007ffc100d8afc R08: 00000003100d8b8f R09: 00000000000927c0 R10: 0000000000000001 R11: 0000000000000246 R12: 00000000000000ef R13: 00000000000927c0 R14: 0000000000033239 R15: 00007ffc100d8b50 sched: DL replenish lagged too much