rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 ticks this GP) idle=1a3c/1/0x4000000000000000 softirq=65408/65409 fqs=1
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P20749/1:b..l
rcu: 	(detected by 1, t=10502 jiffies, g=105001, q=143 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 20746 Comm: syz.0.5982 Not tainted 6.11.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:__rb_erase_augmented include/linux/rbtree_augmented.h:240 [inline]
RIP: 0010:rb_erase+0xee/0xe70 lib/rbtree.c:443
Code: 68 10 48 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 d2 48 89 ef e8 7b 74 4b f6 eb c8 48 89 d8 48 c1 e8 03 <49> bd 00 00 00 00 00 fc ff df 42 80 3c 28 00 74 08 48 89 df e8 59
RSP: 0018:ffffc90000007cc8 EFLAGS: 00000012
RAX: 1ffff1100b939e68 RBX: ffff88805c9cf340 RCX: dffffc0000000000
RDX: 0000000000010000 RSI: ffff8880b922c9d0 RDI: ffff88805c9cf348
RBP: dffffc0000000000 R08: ffffffff8bafebf8 R09: 1ffffffff202fefd
R10: dffffc0000000000 R11: fffffbfff202fefe R12: 0000000000000000
R13: 1ffff1100b939e6a R14: 0000000000000000 R15: ffff88805c9cf350
FS:  0000000000000000(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2dc1dff8 CR3: 000000007c890000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 rb_erase_cached include/linux/rbtree.h:126 [inline]
 timerqueue_del+0xac/0x100 lib/timerqueue.c:57
 __remove_hrtimer kernel/time/hrtimer.c:1118 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1669 [inline]
 __hrtimer_run_queues+0x3d0/0xd50 kernel/time/hrtimer.c:1753
 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1815
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
 __sysvec_apic_timer_interrupt+0x112/0x3f0 arch/x86/kernel/apic/apic.c:1049
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1043
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:trace_lock_acquire include/trace/events/lock.h:24 [inline]
RIP: 0010:lock_acquire+0xdc/0x550 kernel/locking/lockdep.c:5730
Code: 08 0f 83 f4 02 00 00 89 c3 48 89 d8 48 c1 e8 06 48 8d 3c c5 e8 f7 17 90 be 08 00 00 00 e8 ec 03 8b 00 48 0f a3 1d 7c 29 a8 0e <73> 16 e8 cd f5 09 00 84 c0 75 0d 80 3d a0 f6 91 0e 00 0f 84 f9 02
RSP: 0018:ffffc9000be273c0 EFLAGS: 00000257
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff816fce64
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff9017f7e8
RBP: ffffc9000be27518 R08: ffffffff9017f7ef R09: 1ffffffff202fefd
R10: dffffc0000000000 R11: fffffbfff202fefe R12: 1ffff920017c4e80
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffea0001e5e7c0
 rcu_lock_acquire include/linux/rcupdate.h:326 [inline]
 rcu_read_lock include/linux/rcupdate.h:838 [inline]
 page_ext_get+0x3d/0x2a0 mm/page_ext.c:525
 page_table_check_clear+0x4b/0x550 mm/page_table_check.c:74
 get_and_clear_full_ptes include/linux/pgtable.h:678 [inline]
 zap_present_folio_ptes mm/memory.c:1493 [inline]
 zap_present_ptes mm/memory.c:1576 [inline]
 zap_pte_range mm/memory.c:1618 [inline]
 zap_pmd_range mm/memory.c:1736 [inline]
 zap_pud_range mm/memory.c:1765 [inline]
 zap_p4d_range mm/memory.c:1786 [inline]
 unmap_page_range+0x2b48/0x42c0 mm/memory.c:1807
 unmap_vmas+0x3cc/0x5f0 mm/memory.c:1897
 exit_mmap+0x264/0xc80 mm/mmap.c:3412
 __mmput+0x115/0x390 kernel/fork.c:1345
 exit_mm+0x220/0x310 kernel/exit.c:571
 do_exit+0x9b2/0x27f0 kernel/exit.c:869
 do_group_exit+0x207/0x2c0 kernel/exit.c:1031
 __do_sys_exit_group kernel/exit.c:1042 [inline]
 __se_sys_exit_group kernel/exit.c:1040 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1040
 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb253379e79
Code: Unable to access opcode bytes at 0x7fb253379e4f.
RSP: 002b:00007ffebabef4f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb253379e79
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffebabef54c R08: 00007ffebabef5df R09: 00000000000b0158
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000032
R13: 00000000000b0158 R14: 00000000000b00cf R15: 00007ffebabef5a0
 </TASK>
task:syz.1.5984      state:R  running task     stack:24576 pid:20749 tgid:20747 ppid:19820  flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x1800/0x4a60 kernel/sched/core.c:6529
 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6708
 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6732
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 zap_pte_range mm/memory.c:1688 [inline]
 zap_pmd_range mm/memory.c:1736 [inline]
 zap_pud_range mm/memory.c:1765 [inline]
 zap_p4d_range mm/memory.c:1786 [inline]
 unmap_page_range+0x3818/0x42c0 mm/memory.c:1807
 unmap_vmas+0x3cc/0x5f0 mm/memory.c:1897
 exit_mmap+0x264/0xc80 mm/mmap.c:3412
 __mmput+0x115/0x390 kernel/fork.c:1345
 exit_mm+0x220/0x310 kernel/exit.c:571
 do_exit+0x9b2/0x27f0 kernel/exit.c:869
 do_group_exit+0x207/0x2c0 kernel/exit.c:1031
 get_signal+0x16a1/0x1740 kernel/signal.c:2917
 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc30eb79e79
RSP: 002b:00007fc30f8d90e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fc30ed15f88 RCX: 00007fc30eb79e79
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fc30ed15f88
RBP: 00007fc30ed15f80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc30ed15f8c
R13: 0000000000000000 R14: 00007ffda9de50b0 R15: 00007ffda9de5198
 </TASK>
rcu: rcu_preempt kthread starved for 10500 jiffies! g105001 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:25656 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5188 [inline]
 __schedule+0x1800/0x4a60 kernel/sched/core.c:6529
 __schedule_loop kernel/sched/core.c:6606 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6621
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2034
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2236
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 2549 Comm: kworker/u8:8 Not tainted 6.11.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:312 [inline]
RIP: 0010:smp_call_function_many_cond+0x1865/0x29d0 kernel/smp.c:856
Code: 89 e6 83 e6 01 31 ff e8 39 18 0c 00 41 83 e4 01 49 bc 00 00 00 00 00 fc ff df 75 07 e8 e4 13 0c 00 eb 38 f3 90 42 0f b6 04 23 <84> c0 75 11 41 f7 45 00 01 00 00 00 74 1e e8 c8 13 0c 00 eb e4 44
RSP: 0018:ffffc90008c47700 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 1ffff11017248c59 RCX: ffff88802a5f9e00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90008c478e0 R08: ffffffff81877a17 R09: 1ffffffff26e6908
R10: dffffc0000000000 R11: fffffbfff26e6909 R12: dffffc0000000000
R13: ffff8880b92462c8 R14: ffff8880b933fb40 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002000f000 CR3: 000000000e734000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1023
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:2085 [inline]
 text_poke_bp_batch+0x352/0xb30 arch/x86/kernel/alternative.c:2295
 text_poke_flush arch/x86/kernel/alternative.c:2486 [inline]
 text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2493
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 static_key_enable_cpuslocked+0x136/0x260 kernel/jump_label.c:210
 static_key_enable+0x1a/0x20 kernel/jump_label.c:223
 toggle_allocation_gate+0xb5/0x250 mm/kfence/core.c:833
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2e/0x1830 kernel/workqueue.c:3312
 worker_thread+0x86d/0xd10 kernel/workqueue.c:3389
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>