rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=4f5c/1/0x4000000000000000 softirq=64597/64599 fqs=0
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P30151/1:b..l
rcu: 	(detected by 0, t=10505 jiffies, g=111881, q=107 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 30150 Comm: syz-executor.4 Not tainted 6.7.0-rc4-next-20231207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:netdev_get_num_tc include/linux/netdevice.h:2519 [inline]
RIP: 0010:taprio_set_budgets+0x88/0x310 net/sched/sch_taprio.c:672
Code: 03 80 3c 02 00 0f 85 88 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 6d 40 48 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 5c 02 00 00 <48> b8 00 00 00 00 00 fc ff df 48 8b 6d 00 48 8d 7d 2e 48 89 fa 48
RSP: 0018:ffffc900001f0d10 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffff88823bd92ac0 RCX: ffffffff88a9b36f
RDX: 1ffff1100f890000 RSI: ffffffff88a8d962 RDI: ffff88823bd92840
RBP: ffff88807c480000 R08: 0000000000000004 R09: 0000000000000002
R10: 0000000000000002 R11: 0000000000000000 R12: 0000000000000002
R13: ffff888079cefc00 R14: ffff88823bd92b40 R15: ffff888020e0d000
FS:  00007f5130b8d6c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31c21000 CR3: 000000006a20e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 advance_sched+0x5e1/0xc60 net/sched/sch_taprio.c:988
 __run_hrtimer kernel/time/hrtimer.c:1688 [inline]
 __hrtimer_run_queues+0x20c/0xc20 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/0x410 arch/x86/kernel/apic/apic.c:1082
 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1076
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:__sanitizer_cov_trace_switch+0x77/0x90 kernel/kcov.c:326
Code: 24 28 e8 2c fe ff ff 49 39 de 75 e2 5b 5d 41 5c 41 5d 41 5e c3 48 83 f8 40 41 bd 07 00 00 00 74 c2 5b 5d 41 5c 41 5d 41 5e c3 <41> bd 01 00 00 00 eb b1 41 bd 05 00 00 00 eb a9 66 0f 1f 84 00 00
RSP: 0018:ffffc9000ac4f638 EFLAGS: 00000246
RAX: 0000000000000008 RBX: ffffc9000ac4f6e8 RCX: 0000000000000001
RDX: ffff888023b75940 RSI: ffffffff8ac9cc00 RDI: 0000000000000002
RBP: ffffffff8ac9cc00 R08: 0000000000000001 R09: 0000000000000009
R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000002
R13: ffffc9000ac4fc08 R14: ffffffff8fc91e94 R15: 0000000000000002
 unwind_next_frame+0x77d/0x2390 arch/x86/kernel/unwind_orc.c:581
 arch_stack_walk+0xfa/0x170 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
 kasan_save_stack+0x33/0x50 mm/kasan/common.c:47
 kasan_set_track+0x24/0x30 mm/kasan/common.c:61
 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:556
 ____kasan_slab_free mm/kasan/common.c:237 [inline]
 ____kasan_slab_free+0x15b/0x1b0 mm/kasan/common.c:201
 kasan_slab_free include/linux/kasan.h:164 [inline]
 slab_free_hook mm/slub.c:2121 [inline]
 slab_free mm/slub.c:4303 [inline]
 kmem_cache_free+0x12e/0x360 mm/slub.c:4367
 __sigqueue_free kernel/signal.c:450 [inline]
 __sigqueue_free kernel/signal.c:442 [inline]
 sigqueue_free+0x1b4/0x220 kernel/signal.c:1955
 posix_timer_free kernel/time/posix-timers.c:425 [inline]
 posix_timer_unhash_and_free+0x11d/0x170 kernel/time/posix-timers.c:434
 itimer_delete kernel/time/posix-timers.c:1085 [inline]
 exit_itimers+0x3e7/0x560 kernel/time/posix-timers.c:1109
 do_exit+0x629/0x2ad0 kernel/exit.c:845
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1021
 get_signal+0x2395/0x2770 kernel/signal.c:2893
 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:309
 exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
 exit_to_user_mode_prepare+0x11e/0x240 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x1e/0x60 kernel/entry/common.c:296
 do_syscall_64+0x4d/0x110 arch/x86/entry/common.c:88
 entry_SYSCALL_64_after_hwframe+0x62/0x6a
RIP: 0033:0x7f512fe7cba9
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:00007f5130b8d178 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f512ff9bf88 RCX: 00007f512fe7cba9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f512ff9bf88
RBP: 00007f512ff9bf80 R08: 00007f5130b8d6c0 R09: 00007f5130b8d6c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f512ff9bf8c
R13: 000000000000000b R14: 00007ffc36318e00 R15: 00007ffc36318ee8
 </TASK>
task:syz-executor.0  state:R  running task     stack:26864 pid:30151 tgid:30151 ppid:5102   flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5399 [inline]
 __schedule+0xf15/0x5c80 kernel/sched/core.c:6726
 preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6903
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:45
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3a/0x40 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 zap_pte_range mm/memory.c:1544 [inline]
 zap_pmd_range mm/memory.c:1592 [inline]
 zap_pud_range mm/memory.c:1621 [inline]
 zap_p4d_range mm/memory.c:1642 [inline]
 unmap_page_range+0x1aca/0x2b60 mm/memory.c:1663
 unmap_single_vma+0x194/0x2b0 mm/memory.c:1709
 unmap_vmas+0x22f/0x490 mm/memory.c:1753
 exit_mmap+0x1c1/0xb60 mm/mmap.c:3274
 __mmput+0x12a/0x4d0 kernel/fork.c:1341
 mmput+0x62/0x70 kernel/fork.c:1363
 exit_mm kernel/exit.c:567 [inline]
 do_exit+0x9a1/0x2ad0 kernel/exit.c:858
 do_group_exit+0xd3/0x2a0 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+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x62/0x6a
RIP: 0033:0x7fad1107cba9
RSP: 002b:00007ffd780d1f58 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00007fad1107cba9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: 000000000000003c R09: 0000000000000000
R10: 0000001b31c20000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
rcu: rcu_preempt kthread starved for 10505 jiffies! g111881 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:26192 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5399 [inline]
 __schedule+0xf15/0x5c80 kernel/sched/core.c:6726
 __schedule_loop kernel/sched/core.c:6801 [inline]
 schedule+0xe7/0x270 kernel/sched/core.c:6816
 schedule_timeout+0x136/0x290 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:1631
 rcu_gp_kthread+0x245/0x380 kernel/rcu/tree.c:1830
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 24796 Comm: kworker/u4:21 Not tainted 6.7.0-rc4-next-20231207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:311 [inline]
RIP: 0010:smp_call_function_many_cond+0x4e9/0x1570 kernel/smp.c:855
Code: 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 3e c5 0b 00 f3 90 41 0f b6 04 24 <40> 38 c5 7c 08 84 c0 0f 85 44 0e 00 00 8b 43 08 31 ff 83 e0 01 41
RSP: 0018:ffffc9000a7c7920 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff8880b9941a60 RCX: ffffffff817c4dc8
RDX: ffff88807a93bb80 RSI: ffffffff817c4da2 RDI: 0000000000000005
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000006 R12: ffffed101732834d
R13: 0000000000000001 R14: ffff8880b9941a68 R15: ffff8880b983d8c0
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8be80ffd83 CR3: 000000000cf78000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 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:2007 [inline]
 text_poke_bp_batch+0x22b/0x750 arch/x86/kernel/alternative.c:2217
 text_poke_flush arch/x86/kernel/alternative.c:2408 [inline]
 text_poke_flush arch/x86/kernel/alternative.c:2405 [inline]
 text_poke_finish+0x30/0x40 arch/x86/kernel/alternative.c:2415
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 jump_label_update+0x1d7/0x400 kernel/jump_label.c:829
 static_key_enable_cpuslocked+0x1b7/0x270 kernel/jump_label.c:205
 static_key_enable+0x1a/0x20 kernel/jump_label.c:218
 toggle_allocation_gate mm/kfence/core.c:826 [inline]
 toggle_allocation_gate+0xf4/0x250 mm/kfence/core.c:818
 process_one_work+0x8a4/0x15f0 kernel/workqueue.c:2633
 process_scheduled_works kernel/workqueue.c:2706 [inline]
 worker_thread+0x8b6/0x1290 kernel/workqueue.c:2787
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>