rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (0 ticks this GP) idle=1fd4/1/0x4000000000000000 softirq=99413/99413 fqs=0 rcu: (detected by 1, t=10502 jiffies, g=150089, q=188 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 25581 Comm: syz-executor.2 Not tainted 6.5.0-rc7-next-20230824-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 RIP: 0010:should_change_schedules net/sched/sch_taprio.c:895 [inline] RIP: 0010:advance_sched+0x4da/0xc60 net/sched/sch_taprio.c:979 Code: 28 01 00 00 48 8b 98 50 01 00 00 e9 0b fe ff ff 4c 8b 6c 24 60 4c 8b 7c 24 08 4c 8b 74 24 68 e8 5c 16 23 f9 48 83 7c 24 18 00 <0f> 84 b6 05 00 00 e8 4b 16 23 f9 48 8b 44 24 18 48 8d b8 40 01 00 RSP: 0018:ffffc90000007d90 EFLAGS: 00000046 RAX: 0000000080010002 RBX: 18e3badfaa34a620 RCX: 0000000000000000 RDX: ffff88808c129dc0 RSI: ffffffff8864bc14 RDI: 0000000000000004 RBP: ffff888019ef5810 R08: 0000000000000004 R09: 0000000000000002 R10: 0000000000000002 R11: ffffc90000007ff8 R12: 0000000000000002 R13: ffff888019ef5800 R14: ffff88802dbb5340 R15: ffff888019ef7000 FS: 0000555556422480(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555564238f8 CR3: 0000000078346000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __run_hrtimer kernel/time/hrtimer.c:1688 [inline] __hrtimer_run_queues+0x203/0xc10 kernel/time/hrtimer.c:1752 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1063 [inline] __sysvec_apic_timer_interrupt+0x105/0x3f0 arch/x86/kernel/apic/apic.c:1080 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1074 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:unwind_next_frame+0x1221/0x2390 arch/x86/kernel/unwind_orc.c:665 Code: 8b 6b 10 4c 39 ed 73 36 e8 fc 78 4d 00 4c 8d 75 08 4d 39 f4 73 28 e8 ee 78 4d 00 4d 39 f5 72 1e e8 e4 78 4d 00 4c 8b 7c 24 18 <48> 89 ee 4c 89 ff e8 e4 73 4d 00 49 39 ef 0f 83 50 0a 00 00 e8 c6 RSP: 0018:ffffc900050cf0b0 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffffc900050cf130 RCX: 0000000000000000 RDX: ffff88808c129dc0 RSI: ffffffff813a598c RDI: ffffc900050cf140 RBP: ffffc900050cfd90 R08: 0000000000000004 R09: 0000000000000001 R10: 0000000000000001 R11: dffffc0000000000 R12: ffffc900050c8000 R13: ffffc900050d0000 R14: ffffc900050cfd98 R15: ffffc900050cfc78 arch_stack_walk+0xfa/0x170 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x96/0xd0 kernel/stacktrace.c:122 save_stack+0x160/0x1f0 mm/page_owner.c:128 __set_page_owner+0x1f/0x60 mm/page_owner.c:192 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1530 prep_new_page mm/page_alloc.c:1537 [inline] get_page_from_freelist+0x10d7/0x31b0 mm/page_alloc.c:3213 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4469 alloc_pages+0x1a9/0x270 mm/mempolicy.c:2298 __get_free_pages+0xc/0x40 mm/page_alloc.c:4520 kasan_populate_vmalloc_pte+0x29/0x160 mm/kasan/shadow.c:323 apply_to_pte_range mm/memory.c:2589 [inline] apply_to_pmd_range mm/memory.c:2633 [inline] apply_to_pud_range mm/memory.c:2669 [inline] apply_to_p4d_range mm/memory.c:2705 [inline] __apply_to_page_range+0x5ed/0xdb0 mm/memory.c:2739 alloc_vmap_area+0x85f/0x2060 mm/vmalloc.c:1641 __get_vm_area_node+0x132/0x3d0 mm/vmalloc.c:2595 __vmalloc_node_range+0x27a/0x1540 mm/vmalloc.c:3280 alloc_thread_stack_node kernel/fork.c:309 [inline] dup_task_struct kernel/fork.c:1121 [inline] copy_process+0x13f1/0x7400 kernel/fork.c:2334 kernel_clone+0xfd/0x930 kernel/fork.c:2916 __do_sys_clone3+0x1f1/0x260 kernel/fork.c:3217 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fbed96a88d9 Code: ff ff eb d2 e8 f8 62 fd ff 0f 1f 84 00 00 00 00 00 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:00007ffed1c8f088 EFLAGS: 00000206 ORIG_RAX: 00000000000001b3 RAX: ffffffffffffffda RBX: 00007fbed9650fc0 RCX: 00007fbed96a88d9 RDX: 00007fbed9650fc0 RSI: 0000000000000058 RDI: 00007ffed1c8f0d0 RBP: 00007fbeda3996c0 R08: 00007fbeda3996c0 R09: 00007ffed1c8f1b7 R10: 0000000000000008 R11: 0000000000000206 R12: ffffffffffffffb0 R13: 000000000000000b R14: 00007ffed1c8f0d0 R15: 00007ffed1c8f1b8 rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g150089 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=153486 rcu: rcu_preempt kthread starved for 10502 jiffies! g150089 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 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:I stack:28648 pid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5382 [inline] __schedule+0xee1/0x59f0 kernel/sched/core.c:6695 schedule+0xe7/0x1b0 kernel/sched/core.c:6771 schedule_timeout+0x157/0x2c0 kernel/time/timer.c:2167 rcu_gp_fqs_loop+0x1ec/0xa50 kernel/rcu/tree.c:1613 rcu_gp_kthread+0x249/0x380 kernel/rcu/tree.c:1812 kthread+0x33a/0x430 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:304 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 25581 Comm: syz-executor.2 Not tainted 6.5.0-rc7-next-20230824-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:778 [inline] RIP: 0010:advance_sched+0x6ab/0xc60 net/sched/sch_taprio.c:998 Code: d9 01 31 ff 89 c3 89 c6 e8 12 10 23 f9 85 db 58 0f 85 78 02 00 00 e8 94 14 23 f9 48 8b 7c 24 20 e8 da 4f cb ff e8 25 ab d9 01 <31> ff 89 c3 89 c6 e8 ea 0f 23 f9 85 db 0f 85 d1 01 00 00 e8 6d 14 RSP: 0018:ffffc90000007d90 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88808c129dc0 RSI: ffffffff8864bde6 RDI: 0000000000000001 RBP: ffff888019ef5810 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: ffffc90000007ff8 R12: 0000000000000002 R13: ffff888019ef5800 R14: ffff88802dbb5340 R15: ffff888019ef7000 FS: 0000555556422480(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555564238f8 CR3: 0000000078346000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __run_hrtimer kernel/time/hrtimer.c:1688 [inline] __hrtimer_run_queues+0x203/0xc10 kernel/time/hrtimer.c:1752 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1063 [inline] __sysvec_apic_timer_interrupt+0x105/0x3f0 arch/x86/kernel/apic/apic.c:1080 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1074 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:unwind_next_frame+0x1221/0x2390 arch/x86/kernel/unwind_orc.c:665 Code: 8b 6b 10 4c 39 ed 73 36 e8 fc 78 4d 00 4c 8d 75 08 4d 39 f4 73 28 e8 ee 78 4d 00 4d 39 f5 72 1e e8 e4 78 4d 00 4c 8b 7c 24 18 <48> 89 ee 4c 89 ff e8 e4 73 4d 00 49 39 ef 0f 83 50 0a 00 00 e8 c6 RSP: 0018:ffffc900050cf0b0 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffffc900050cf130 RCX: 0000000000000000 RDX: ffff88808c129dc0 RSI: ffffffff813a598c RDI: ffffc900050cf140 RBP: ffffc900050cfd90 R08: 0000000000000004 R09: 0000000000000001 R10: 0000000000000001 R11: dffffc0000000000 R12: ffffc900050c8000 R13: ffffc900050d0000 R14: ffffc900050cfd98 R15: ffffc900050cfc78 arch_stack_walk+0xfa/0x170 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x96/0xd0 kernel/stacktrace.c:122 save_stack+0x160/0x1f0 mm/page_owner.c:128 __set_page_owner+0x1f/0x60 mm/page_owner.c:192 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1530 prep_new_page mm/page_alloc.c:1537 [inline] get_page_from_freelist+0x10d7/0x31b0 mm/page_alloc.c:3213 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4469 alloc_pages+0x1a9/0x270 mm/mempolicy.c:2298 __get_free_pages+0xc/0x40 mm/page_alloc.c:4520 kasan_populate_vmalloc_pte+0x29/0x160 mm/kasan/shadow.c:323 apply_to_pte_range mm/memory.c:2589 [inline] apply_to_pmd_range mm/memory.c:2633 [inline] apply_to_pud_range mm/memory.c:2669 [inline] apply_to_p4d_range mm/memory.c:2705 [inline] __apply_to_page_range+0x5ed/0xdb0 mm/memory.c:2739 alloc_vmap_area+0x85f/0x2060 mm/vmalloc.c:1641 __get_vm_area_node+0x132/0x3d0 mm/vmalloc.c:2595 __vmalloc_node_range+0x27a/0x1540 mm/vmalloc.c:3280 alloc_thread_stack_node kernel/fork.c:309 [inline] dup_task_struct kernel/fork.c:1121 [inline] copy_process+0x13f1/0x7400 kernel/fork.c:2334 kernel_clone+0xfd/0x930 kernel/fork.c:2916 __do_sys_clone3+0x1f1/0x260 kernel/fork.c:3217 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fbed96a88d9 Code: ff ff eb d2 e8 f8 62 fd ff 0f 1f 84 00 00 00 00 00 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:00007ffed1c8f088 EFLAGS: 00000206 ORIG_RAX: 00000000000001b3 RAX: ffffffffffffffda RBX: 00007fbed9650fc0 RCX: 00007fbed96a88d9 RDX: 00007fbed9650fc0 RSI: 0000000000000058 RDI: 00007ffed1c8f0d0 RBP: 00007fbeda3996c0 R08: 00007fbeda3996c0 R09: 00007ffed1c8f1b7 R10: 0000000000000008 R11: 0000000000000206 R12: ffffffffffffffb0 R13: 000000000000000b R14: 00007ffed1c8f0d0 R15: 00007ffed1c8f1b8