rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=59e4/1/0x4000000000000000 softirq=60844/60851 fqs=11
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:        4         50           10
rcu: 	cputime:        0          7            0   ==> 105100(ms)
rcu: 	(detected by 0, t=10505 jiffies, g=98665, q=758 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 13994 Comm: syz.4.1948 Not tainted 6.10.0-rc6-syzkaller-00163-g661e504db04c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:__preempt_count_dec_and_test arch/x86/include/asm/preempt.h:94 [inline]
RIP: 0010:rcu_is_watching+0x79/0xc0 kernel/rcu/tree.c:725
Code: 00 00 00 fc ff df 48 89 da 48 c1 ea 03 0f b6 14 02 48 89 d8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 24 8b 03 c1 e8 02 83 e0 01 <65> ff 0d b8 a1 8f 7e 74 07 5b 5d c3 cc cc cc cc e8 02 6a 8c ff 5b
RSP: 0018:ffffc90000a184e0 EFLAGS: 00000002
RAX: 0000000000000001 RBX: ffff8880b9337ee8 RCX: ffffffff817b013e
RDX: 0000000000000000 RSI: ffffffff8b8ff600 RDI: ffffffff8d4ceb48
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff8880b932cac0
R13: ffff88801cab0340 R14: ffff8880b932c9c0 R15: ffffffff88f93790
FS:  0000000000000000(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f126bf76440 CR3: 000000000d97a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 trace_hrtimer_expire_entry include/trace/events/timer.h:259 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1686 [inline]
 __hrtimer_run_queues+0x9ea/0xcc0 kernel/time/hrtimer.c:1753
 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1815
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
 __sysvec_apic_timer_interrupt+0x10f/0x450 arch/x86/kernel/apic/apic.c:1049
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0x43/0xb0 arch/x86/kernel/apic/apic.c:1043
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:unwind_next_frame+0x5e4/0x23a0 arch/x86/kernel/unwind_orc.c:505
Code: 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 0f b6 04 02 4c 89 ea 83 e2 07 38 d0 7f 08 84 c0 0f 85 71 18 00 00 45 0f b6 74 24 05 <31> ff 41 83 e6 07 44 89 f6 e8 3e 02 51 00 45 84 f6 0f 84 ec fd ff
RSP: 0018:ffffc90000a18780 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90000a18800 RCX: ffffffff813ccc24
RDX: 0000000000000005 RSI: ffffffff813cdcb2 RDI: 0000000000000006
RBP: 0000000000000002 R08: 0000000000000006 R09: ffffffff845ffb64
R10: ffffffff845ff81c R11: 0000000000000000 R12: ffffffff90a98900
R13: ffffffff90a98905 R14: 0000000000000002 R15: ffffc90000a18835
 arch_stack_walk+0x100/0x170 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x95/0xd0 kernel/stacktrace.c:122
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579
 poison_slab_object+0xf7/0x160 mm/kasan/common.c:240
 __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2196 [inline]
 slab_free mm/slub.c:4438 [inline]
 kmem_cache_free+0x12f/0x3a0 mm/slub.c:4513
 mempool_free+0xe7/0x3b0 mm/mempool.c:548
 bvec_free+0xfb/0x120 block/bio.c:167
 bio_free+0xaa/0x130 block/bio.c:236
 bio_put_percpu_cache block/bio.c:800 [inline]
 bio_put+0x355/0x5b0 block/bio.c:819
 ext4_end_bio+0x2d7/0x590 fs/ext4/page-io.c:366
 bio_endio+0x644/0x760 block/bio.c:1636
 blk_update_request+0x704/0x1850 block/blk-mq.c:929
 scsi_end_request+0x7b/0x9b0 drivers/scsi/scsi_lib.c:631
 scsi_io_completion+0x17c/0x14c0 drivers/scsi/scsi_lib.c:1068
 scsi_complete+0x124/0x250 drivers/scsi/scsi_lib.c:1530
 blk_complete_reqs+0xae/0xf0 block/blk-mq.c:1132
 handle_softirqs+0x216/0x8f0 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu kernel/softirq.c:637 [inline]
 irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649
 common_interrupt+0xb0/0xd0 arch/x86/kernel/irq.c:278
 </IRQ>
 <TASK>
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 e6 c7 80 f6 48 89 df e8 ce 44 81 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 <bf> 01 00 00 00 e8 e5 86 72 f6 65 8b 05 b6 d3 18 75 85 c0 74 16 5b
RSP: 0018:ffffc900033c79e8 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffffffff94d52858 RCX: 1ffffffff1fc7f49
RDX: 0000000000000000 RSI: ffffffff8b2caf00 RDI: ffffffff8b8ff680
RBP: 0000000000000206 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8fe43cd7 R11: ffffffff8b2e3680 R12: 0000000000000001
R13: ffff888029de1c40 R14: 1ffff92000678f44 R15: ffffffff94d52850
 debug_object_activate+0x34d/0x540 lib/debugobjects.c:726
 debug_rcu_head_queue kernel/rcu/rcu.h:227 [inline]
 __call_rcu_common.constprop.0+0x2c/0x790 kernel/rcu/tree.c:3057
 task_work_run+0x14e/0x250 kernel/task_work.c:180
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xa9b/0x2ba0 kernel/exit.c:876
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1025
 get_signal+0x2616/0x2710 kernel/signal.c:2909
 arch_do_signal_or_restart+0x90/0x7e0 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+0x14a/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7593575bd9
Code: Unable to access opcode bytes at 0x7f7593575baf.
RSP: 002b:00007f759438b048 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: 000000000000000b RBX: 00007f7593703f60 RCX: 00007f7593575bd9
RDX: 0000000000000651 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00007f75935e4aa1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f7593703f60 R15: 00007ffe38651678
 </TASK>
rcu: rcu_preempt kthread starved for 10450 jiffies! g98665 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:27680 pid:17    tgid:17    ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5408 [inline]
 __schedule+0xf15/0x5d00 kernel/sched/core.c:6745
 __schedule_loop kernel/sched/core.c:6822 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6837
 schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2581
 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2000
 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2202
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 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: 0 PID: 11 Comm: kworker/u8:0 Not tainted 6.10.0-rc6-syzkaller-00163-g661e504db04c #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+0x4e7/0x1420 kernel/smp.c:855
Code: 0c 00 85 ed 74 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 4b 38 0c 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 f7 0c 00 00 8b 43 08 31
RSP: 0018:ffffc90000107908 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff8880b9344900 RCX: ffffffff8181ac6b
RDX: ffff8880172f3c00 RSI: ffffffff8181ac45 RDI: 0000000000000005
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000006 R12: ffffed1017268921
R13: 0000000000000001 R14: ffff8880b9344908 R15: ffff8880b923fd80
FS:  0000000000000000(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3791503ff8 CR3: 000000000d97a000 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:2069 [inline]
 text_poke_bp_batch+0x659/0x760 arch/x86/kernel/alternative.c:2279
 text_poke_flush arch/x86/kernel/alternative.c:2470 [inline]
 text_poke_flush arch/x86/kernel/alternative.c:2467 [inline]
 text_poke_finish+0x30/0x40 arch/x86/kernel/alternative.c:2477
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 jump_label_update+0x1d7/0x400 kernel/jump_label.c:882
 static_key_disable_cpuslocked+0x154/0x1c0 kernel/jump_label.c:235
 static_key_disable+0x1a/0x20 kernel/jump_label.c:243
 toggle_allocation_gate mm/kfence/core.c:831 [inline]
 toggle_allocation_gate+0x143/0x250 mm/kfence/core.c:818
 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3248
 process_scheduled_works kernel/workqueue.c:3329 [inline]
 worker_thread+0x6c8/0xf30 kernel/workqueue.c:3409
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>