rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (0 ticks this GP) idle=a54c/1/0x4000000000000000 softirq=128700/128700 fqs=0
rcu: 	(detected by 0, t=10503 jiffies, g=196941, q=146 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4625 Comm: syz-executor.3 Not tainted 6.6.0-rc4-syzkaller-00008-g8f1b4600373f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
RIP: 0010:rb_erase_cached include/linux/rbtree.h:123 [inline]
RIP: 0010:timerqueue_del+0x66/0x100 lib/timerqueue.c:57
Code: 00 48 89 df 4c 89 ee e8 18 b5 c6 f6 4c 39 eb 0f 84 95 00 00 00 e8 fa b2 c6 f6 49 8d 5e 08 49 89 df 49 c1 ef 03 41 80 3c 2f 00 <74> 08 48 89 df e8 f0 2e 21 f7 4c 39 2b 74 07 e8 d6 b2 c6 f6 eb 25
RSP: 0018:ffffc900001f0d28 EFLAGS: 00000046
RAX: ffffffff8ac758b6 RBX: ffff8880b992b998 RCX: ffff888044cb1dc0
RDX: 0000000000010002 RSI: ffff888014293340 RDI: 0000000000000001
RBP: dffffc0000000000 R08: ffffffff8ac758a8 R09: 1ffffffff1d34fc5
R10: dffffc0000000000 R11: fffffbfff1d34fc6 R12: 1ffff11002852668
R13: ffff888014293340 R14: ffff8880b992b990 R15: 1ffff11017325733
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000440 CR3: 000000000d130000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 __remove_hrtimer kernel/time/hrtimer.c:1119 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1668 [inline]
 __hrtimer_run_queues+0x3ed/0xd10 kernel/time/hrtimer.c:1752
 hrtimer_interrupt+0x396/0x980 kernel/time/hrtimer.c:1814
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1063 [inline]
 __sysvec_apic_timer_interrupt+0x104/0x390 arch/x86/kernel/apic/apic.c:1080
 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1074
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:lock_acquire+0x25a/0x520 kernel/locking/lockdep.c:5757
Code: 2b 00 74 08 4c 89 f7 e8 34 95 7b 00 f6 44 24 61 02 0f 85 84 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc9000bddf4c0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff920017bbea4 RCX: ffffffff816d0917
RDX: 0000000000000000 RSI: ffffffff8b0ab620 RDI: ffffffff8b599ca0
RBP: ffffc9000bddf618 R08: dffffc0000000000 R09: 1ffffffff20df670
R10: dffffc0000000000 R11: fffffbfff20df671 R12: 1ffff920017bbea0
R13: dffffc0000000000 R14: ffffc9000bddf520 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:303 [inline]
 rcu_read_lock include/linux/rcupdate.h:749 [inline]
 page_ext_get+0x3d/0x2a0 mm/page_ext.c:508
 page_table_check_clear+0x1df/0x840 mm/page_table_check.c:72
 zap_pte_range mm/memory.c:1431 [inline]
 zap_pmd_range mm/memory.c:1573 [inline]
 zap_pud_range mm/memory.c:1602 [inline]
 zap_p4d_range mm/memory.c:1623 [inline]
 unmap_page_range+0x1d58/0x3320 mm/memory.c:1644
 unmap_vmas+0x2b8/0x460 mm/memory.c:1731
 exit_mmap+0x297/0xc50 mm/mmap.c:3210
 __mmput+0x115/0x3c0 kernel/fork.c:1349
 exit_mm+0x21f/0x300 kernel/exit.c:567
 do_exit+0x9af/0x2650 kernel/exit.c:861
 do_group_exit+0x206/0x2c0 kernel/exit.c:1024
 __do_sys_exit_group kernel/exit.c:1035 [inline]
 __se_sys_exit_group kernel/exit.c:1033 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1033
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f3a1007cae9
Code: Unable to access opcode bytes at 0x7f3a1007cabf.
RSP: 002b:00007ffed6cb9fb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00007f3a1007cae9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: 000000000000001e R09: 0000000000000000
R10: 0000001b31f20000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10502 jiffies! g196941 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=221299
rcu: rcu_preempt kthread starved for 10503 jiffies! g196941 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:25608 pid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x196c/0x4af0 kernel/sched/core.c:6695
 schedule+0xc3/0x180 kernel/sched/core.c:6771
 schedule_timeout+0x1bd/0x300 kernel/time/timer.c:2167
 rcu_gp_fqs_loop+0x2c6/0x1010 kernel/rcu/tree.c:1613
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:1812
 kthread+0x2d3/0x370 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4625 Comm: syz-executor.3 Not tainted 6.6.0-rc4-syzkaller-00008-g8f1b4600373f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]
RIP: 0010:raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:444 [inline]
RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline]
RIP: 0010:queued_spin_is_locked include/asm-generic/qspinlock.h:57 [inline]
RIP: 0010:debug_spin_unlock kernel/locking/spinlock_debug.c:100 [inline]
RIP: 0010:do_raw_spin_unlock+0x5f/0x8b0 kernel/locking/spinlock_debug.c:140
Code: 48 89 14 24 0f 85 2d 04 00 00 81 3a ad 4e ad de 0f 85 00 01 00 00 4c 89 ff be 04 00 00 00 e8 f8 22 7a 00 4c 89 f8 48 c1 e8 03 <0f> b6 04 18 84 c0 0f 85 23 04 00 00 41 83 3f 00 0f 84 99 01 00 00
RSP: 0018:ffffc900001f0b00 EFLAGS: 00000806
RAX: 1ffffffff24159fc RBX: dffffc0000000000 RCX: ffffffff816e6688
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff920acfe0
RBP: ffffc900001f0bf0 R08: ffffffff920acfe3 R09: 1ffffffff24159fc
R10: dffffc0000000000 R11: fffffbfff24159fd R12: dffffc0000000000
R13: 1ffff9200003e16c R14: ffffc900001f0b80 R15: ffffffff920acfe0
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000440 CR3: 000000000d130000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:150 [inline]
 _raw_spin_unlock_irqrestore+0x81/0x140 kernel/locking/spinlock.c:194
 debug_object_activate+0x3c4/0x530 lib/debugobjects.c:745
 debug_hrtimer_activate kernel/time/hrtimer.c:422 [inline]
 debug_activate kernel/time/hrtimer.c:477 [inline]
 enqueue_hrtimer+0x30/0x310 kernel/time/hrtimer.c:1087
 __run_hrtimer kernel/time/hrtimer.c:1705 [inline]
 __hrtimer_run_queues+0x6c0/0xd10 kernel/time/hrtimer.c:1752
 hrtimer_interrupt+0x396/0x980 kernel/time/hrtimer.c:1814
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1063 [inline]
 __sysvec_apic_timer_interrupt+0x104/0x390 arch/x86/kernel/apic/apic.c:1080
 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1074
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:lock_acquire+0x25a/0x520 kernel/locking/lockdep.c:5757
Code: 2b 00 74 08 4c 89 f7 e8 34 95 7b 00 f6 44 24 61 02 0f 85 84 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25
RSP: 0018:ffffc9000bddf4c0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff920017bbea4 RCX: ffffffff816d0917
RDX: 0000000000000000 RSI: ffffffff8b0ab620 RDI: ffffffff8b599ca0
RBP: ffffc9000bddf618 R08: dffffc0000000000 R09: 1ffffffff20df670
R10: dffffc0000000000 R11: fffffbfff20df671 R12: 1ffff920017bbea0
R13: dffffc0000000000 R14: ffffc9000bddf520 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:303 [inline]
 rcu_read_lock include/linux/rcupdate.h:749 [inline]
 page_ext_get+0x3d/0x2a0 mm/page_ext.c:508
 page_table_check_clear+0x1df/0x840 mm/page_table_check.c:72
 zap_pte_range mm/memory.c:1431 [inline]
 zap_pmd_range mm/memory.c:1573 [inline]
 zap_pud_range mm/memory.c:1602 [inline]
 zap_p4d_range mm/memory.c:1623 [inline]
 unmap_page_range+0x1d58/0x3320 mm/memory.c:1644
 unmap_vmas+0x2b8/0x460 mm/memory.c:1731
 exit_mmap+0x297/0xc50 mm/mmap.c:3210
 __mmput+0x115/0x3c0 kernel/fork.c:1349
 exit_mm+0x21f/0x300 kernel/exit.c:567
 do_exit+0x9af/0x2650 kernel/exit.c:861
 do_group_exit+0x206/0x2c0 kernel/exit.c:1024
 __do_sys_exit_group kernel/exit.c:1035 [inline]
 __se_sys_exit_group kernel/exit.c:1033 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1033
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f3a1007cae9
Code: Unable to access opcode bytes at 0x7f3a1007cabf.
RSP: 002b:00007ffed6cb9fb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00007f3a1007cae9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: 000000000000001e R09: 0000000000000000
R10: 0000001b31f20000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001
 </TASK>