rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=bb44/1/0x4000000000000000 softirq=44792/44793 fqs=12 rcu: (detected by 1, t=10505 jiffies, g=85569, q=290 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 15746 Comm: syz-executor.2 Not tainted 6.6.0-rc6-next-20231018-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 RIP: 0010:taprio_set_budgets+0x1e8/0x310 net/sched/sch_taprio.c:677 Code: 44 89 33 44 8b 74 24 0c 89 ee 48 83 c5 01 83 c6 01 49 83 c5 08 48 83 c3 04 44 89 f7 e8 81 ad 1b f9 41 39 ee 7e 65 89 6c 24 08 83 b2 1b f9 48 63 f5 48 83 fe 0f 0f 87 a6 00 00 00 4c 89 e8 48 RSP: 0018:ffffc90000007d10 EFLAGS: 00000806 RAX: 1ffff1100501485c RBX: ffff888017282c80 RCX: ffffffff886d188a RDX: ffff8880266dbb80 RSI: 0000000000000000 RDI: ffff8880280a42e0 RBP: 0000000000000000 R08: ffff888017281530 R09: 0000000000000000 R10: 0000000000000002 R11: ffffc90000007ff8 R12: 0000000000000002 R13: ffff888017282c00 R14: ffff8880280a4340 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31721000 CR3: 0000000049b6e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: advance_sched+0x5de/0xc60 net/sched/sch_taprio.c:988 __run_hrtimer kernel/time/hrtimer.c:1688 [inline] __hrtimer_run_queues+0x20e/0xc00 kernel/time/hrtimer.c:1752 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline] __sysvec_apic_timer_interrupt+0x10c/0x400 arch/x86/kernel/apic/apic.c:1082 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1076 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:__page_table_check_pte_clear+0x6/0x5a0 mm/page_table_check.c:153 Code: ef e8 8e 59 f5 ff e9 cc fb ff ff 4c 89 e7 e8 81 59 f5 ff e9 4d fc ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 41 56 <41> 55 41 54 49 bc 00 00 00 00 00 fc ff df 55 48 89 fd 53 48 83 ec RSP: 0018:ffffc90008fbf8e8 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff81c9afb8 RDX: ffff8880266dbb80 RSI: 8000000055dc7007 RDI: ffff888029214280 RBP: 8000000055dc7007 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: dffffc0000000000 R12: 0000000000000001 R13: ffff888017302280 R14: dffffc0000000000 R15: ffffea00015771c0 page_table_check_pte_clear include/linux/page_table_check.h:49 [inline] ptep_get_and_clear_full arch/x86/include/asm/pgtable.h:1301 [inline] zap_pte_range mm/memory.c:1440 [inline] zap_pmd_range mm/memory.c:1582 [inline] zap_pud_range mm/memory.c:1611 [inline] zap_p4d_range mm/memory.c:1632 [inline] unmap_page_range+0x18dc/0x2c00 mm/memory.c:1653 unmap_single_vma+0x194/0x2b0 mm/memory.c:1699 unmap_vmas+0x229/0x470 mm/memory.c:1743 exit_mmap+0x1ad/0xa70 mm/mmap.c:3308 __mmput+0x12a/0x4d0 kernel/fork.c:1349 mmput+0x62/0x70 kernel/fork.c:1371 exit_mm kernel/exit.c:567 [inline] do_exit+0x9ad/0x2ae0 kernel/exit.c:858 do_group_exit+0xd4/0x2a0 kernel/exit.c:1021 __do_sys_exit_group kernel/exit.c:1032 [inline] __se_sys_exit_group kernel/exit.c:1030 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1030 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f8f6c27cae9 Code: Unable to access opcode bytes at 0x7f8f6c27cabf. RSP: 002b:00007fff7dda8458 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00007f8f6c27cae9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000001 R08: 00000000000000d4 R09: 0000000000000000 R10: 0000001b31b20000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001 rcu: rcu_preempt kthread starved for 10445 jiffies! g85569 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:26464 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0xee4/0x5a10 kernel/sched/core.c:6680 __schedule_loop kernel/sched/core.c:6757 [inline] schedule+0xe7/0x270 kernel/sched/core.c:6772 schedule_timeout+0x157/0x2c0 kernel/time/timer.c:2167 rcu_gp_fqs_loop+0x1ec/0xb10 kernel/rcu/tree.c:1626 rcu_gp_kthread+0x249/0x380 kernel/rcu/tree.c:1825 kthread+0x33c/0x440 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 rcu: Stack dump where RCU GP kthread last ran: CPU: 1 PID: 15765 Comm: syz-executor.1 Not tainted 6.6.0-rc6-next-20231018-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 RIP: 0010:csd_lock_wait kernel/smp.c:311 [inline] RIP: 0010:smp_call_function_many_cond+0x4c1/0x1560 kernel/smp.c:855 Code: 0b 00 85 ed 74 4d 48 b8 00 00 00 00 00 fc ff df 4d 89 f4 4c 89 f5 49 c1 ec 03 83 e5 07 49 01 c4 83 c5 03 e8 71 c5 0b 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 4b 0e 00 00 8b 43 08 31 RSP: 0018:ffffc900091af6b0 EFLAGS: 00000246 RAX: 0000000000040000 RBX: ffff8880b98441e0 RCX: ffffc9000b982000 RDX: 0000000000040000 RSI: ffffffff817d06bf RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 000000000000007b R12: ffffed101730883d R13: 0000000000000001 R14: ffff8880b98441e8 R15: ffff8880b993d900 FS: 00007f865bf8f6c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc306575198 CR3: 000000007c05d000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1023 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2006 [inline] text_poke_bp_batch+0x2ce/0x960 arch/x86/kernel/alternative.c:2216 text_poke_flush arch/x86/kernel/alternative.c:2407 [inline] text_poke_flush arch/x86/kernel/alternative.c:2404 [inline] text_poke_finish+0x30/0x40 arch/x86/kernel/alternative.c:2414 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 jump_label_update+0x32e/0x410 kernel/jump_label.c:829 static_key_slow_inc_cpuslocked+0xe1/0x190 kernel/jump_label.c:165 static_key_slow_inc+0x1a/0x30 kernel/jump_label.c:186 tcp_md5_do_add+0x28a/0x420 net/ipv4/tcp_ipv4.c:1251 tcp_v4_parse_md5_keys+0x231/0x6a0 net/ipv4/tcp_ipv4.c:1378 do_tcp_setsockopt+0x1f29/0x2830 net/ipv4/tcp.c:3597 tcp_setsockopt+0xd4/0x100 net/ipv4/tcp.c:3673 __sys_setsockopt+0x2cd/0x5b0 net/socket.c:2325 __do_sys_setsockopt net/socket.c:2336 [inline] __se_sys_setsockopt net/socket.c:2333 [inline] __x64_sys_setsockopt+0xbd/0x150 net/socket.c:2333 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f865b27cae9 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:00007f865bf8f0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f865b39c2c0 RCX: 00007f865b27cae9 RDX: 000000000000000e RSI: 0000000000000006 RDI: 0000000000000008 RBP: 00007f865b2c847a R08: 00000000000000d8 R09: 0000000000000000 R10: 00000000200004c0 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f865b39c2c0 R15: 00007fffc8b97508