rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 GPs behind) idle=996c/1/0x4000000000000000 softirq=108734/108735 fqs=0
rcu: 	(detected by 1, t=10502 jiffies, g=163389, q=393 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 23545 Comm: syz.1.5066 Not tainted 6.10.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
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 98 d8 1f f6 4c 39 eb 0f 84 99 00 00 00 e8 2a d6 1f f6 49 8d 5e 08 49 89 df 49 c1 ef 03 41 80 3c 2f 00 <74> 08 48 89 df e8 c0 41 82 f6 4c 39 2b 74 07 e8 06 d6 1f f6 eb 25
RSP: 0018:ffffc90000007d28 EFLAGS: 00000046
RAX: ffffffff8b765096 RBX: ffff8880b942c9d8 RCX: ffff888019f08000
RDX: 0000000080010001 RSI: ffff888067f83340 RDI: 0000000000000001
RBP: dffffc0000000000 R08: ffffffff8b765088 R09: 1ffffffff1f583a5
R10: dffffc0000000000 R11: fffffbfff1f583a6 R12: 1ffff1100cff0668
R13: ffff888067f83340 R14: ffff8880b942c9d0 R15: 1ffff1101728593b
FS:  00007f673eae26c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33b10ff8 CR3: 000000006e586000 CR4: 00000000003506f0
DR0: 0004000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 __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+0x110/0x3f0 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:__outw arch/x86/include/asm/shared/io.h:23 [inline]
RIP: 0010:iowrite16+0x37/0x90 lib/iomap.c:213
Code: 28 e9 fc 48 81 fb 00 00 04 00 72 0a e8 c2 28 e9 fc 66 89 2b eb 59 48 81 fb 01 00 01 00 72 0d e8 af 28 e9 fc 89 e8 89 da 66 ef <eb> 43 8b 2d a1 d7 f5 09 31 ff 89 ee e8 d8 2c e9 fc 85 ed 74 2b e8
RSP: 0018:ffffc9000efaf928 EFLAGS: 00000287
RAX: 0000000000000000 RBX: 000000000001c0b0 RCX: 0000000000040000
RDX: 000000000001c0b0 RSI: 00000000000260ae RDI: 00000000000260af
RBP: 0000000000000000 R08: ffffffff851c89a0 R09: ffff88801f0f5198
R10: dffffc0000000000 R11: ffffffff851de0e0 R12: dffffc0000000000
R13: 0000000000002822 R14: dffffc0000000000 R15: ffff88801ea3f200
 vp_notify+0x57/0x80 drivers/virtio/virtio_pci_common.c:45
 virtqueue_notify drivers/virtio/virtio_ring.c:2370 [inline]
 virtqueue_kick+0x39b/0x5c0 drivers/virtio/virtio_ring.c:2393
 request_entropy drivers/char/hw_random/virtio-rng.c:63 [inline]
 copy_data+0x237/0x370 drivers/char/hw_random/virtio-rng.c:74
 virtio_read+0xcb/0x200 drivers/char/hw_random/virtio-rng.c:92
 rng_get_data drivers/char/hw_random/core.c:186 [inline]
 rng_dev_read+0x248/0x6d0 drivers/char/hw_random/core.c:224
 do_loop_readv_writev fs/read_write.c:761 [inline]
 vfs_readv+0x6c2/0xa90 fs/read_write.c:934
 do_preadv fs/read_write.c:1049 [inline]
 __do_sys_preadv fs/read_write.c:1099 [inline]
 __se_sys_preadv fs/read_write.c:1094 [inline]
 __x64_sys_preadv+0x1c7/0x2d0 fs/read_write.c:1094
 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: 0033:0x7f673dd75bd9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f673eae2048 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00007f673df04038 RCX: 00007f673dd75bd9
RDX: 0000000000000001 RSI: 0000000020000240 RDI: 0000000000000008
RBP: 00007f673dde4e60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f673df04038 R15: 00007ffcad79d7e8
 </TASK>
rcu: rcu_preempt kthread starved for 10502 jiffies! g163389 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:25840 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0x1796/0x49d0 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6837
 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2000
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2202
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/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 PID: 2820 Comm: kworker/u8:10 Not tainted 6.10.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:311 [inline]
RIP: 0010:smp_call_function_many_cond+0x1860/0x29d0 kernel/smp.c:855
Code: 45 8b 65 00 44 89 e6 83 e6 01 31 ff e8 c9 0c 0c 00 41 83 e4 01 49 bc 00 00 00 00 00 fc ff df 75 07 e8 74 08 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 58 08
RSP: 0018:ffffc90009617700 EFLAGS: 00000293
RAX: ffffffff818a1e68 RBX: 1ffff11017288c01 RCX: ffff88802b8cda00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900096178e0 R08: ffffffff818a1e37 R09: 1ffffffff25ee2b0
R10: dffffc0000000000 R11: fffffbfff25ee2b1 R12: dffffc0000000000
R13: ffff8880b9446008 R14: ffff8880b953f880 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe6a0637d60 CR3: 000000000e132000 CR4: 00000000003506f0
DR0: 0004000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
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:2069 [inline]
 text_poke_bp_batch+0x352/0xb30 arch/x86/kernel/alternative.c:2279
 text_poke_flush arch/x86/kernel/alternative.c:2470 [inline]
 text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2477
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 static_key_enable_cpuslocked+0x136/0x260 kernel/jump_label.c:205
 static_key_enable+0x1a/0x20 kernel/jump_label.c:218
 toggle_allocation_gate+0xb5/0x250 mm/kfence/core.c:826
 process_one_work kernel/workqueue.c:3248 [inline]
 process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3329
 worker_thread+0x86d/0xd50 kernel/workqueue.c:3409
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>