rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=dbec/1/0x4000000000000000 softirq=44826/44827 fqs=0
rcu: 	(detected by 0, t=10506 jiffies, g=41237, q=273 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 13557 Comm: syz.0.3437 Not tainted 6.14.0-rc7-syzkaller-00074-ga7f2e10ecd8f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:kasan_mem_to_shadow include/linux/kasan.h:64 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x39/0x1a0 mm/kasan/generic.c:189
Code: f8 41 54 44 0f b6 c2 48 01 f0 55 53 0f 82 c6 00 00 00 48 b8 ff ff ff ff ff 7f ff ff 48 39 f8 0f 83 b3 00 00 00 4c 8d 54 37 ff <48> 89 fd 48 b8 00 00 00 00 00 fc ff df 4d 89 d1 48 c1 ed 03 49 c1
RSP: 0018:ffffc90000a28c00 EFLAGS: 00000083
RAX: ffff7fffffffffff RBX: 1ffff92000145186 RCX: ffffffff8196b369
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90626a10
RBP: 0000000000000001 R08: 0000000000000000 R09: fffff5200014518e
R10: ffffffff90626a17 R11: 0000000000000001 R12: ffffffff9ab4e3d8
R13: ffff888032ea4340 R14: 1ffff920001451a4 R15: ffffffff9ab4e3b8
FS:  0000555595531500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000240 CR3: 00000000288f8000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 cpumask_test_cpu include/linux/cpumask.h:570 [inline]
 cpu_online include/linux/cpumask.h:1116 [inline]
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0xa9/0x6f0 kernel/locking/lockdep.c:5862
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline]
 _raw_spin_unlock_irqrestore+0x1a/0x80 kernel/locking/spinlock.c:194
 debug_object_activate+0x2e6/0x4a0 lib/debugobjects.c:836
 debug_hrtimer_activate kernel/time/hrtimer.c:455 [inline]
 debug_activate kernel/time/hrtimer.c:496 [inline]
 enqueue_hrtimer+0x25/0x3c0 kernel/time/hrtimer.c:1100
 __run_hrtimer kernel/time/hrtimer.c:1818 [inline]
 __hrtimer_run_queues+0x903/0xae0 kernel/time/hrtimer.c:1865
 hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1927
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:finish_task_switch.isra.0+0x220/0xcc0 kernel/sched/core.c:5252
Code: a9 0a 00 00 44 8b 0d b3 e4 d9 0e 45 85 c9 0f 85 c0 01 00 00 48 89 df e8 ae f8 ff ff e8 a9 f2 38 00 fb 65 48 8b 1d a0 20 7b 7e <48> 8d bb 08 16 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1
RSP: 0018:ffffc90004b17a48 EFLAGS: 00000206
RAX: 0000000000000cb1 RBX: ffff888026700000 RCX: 1ffffffff20c44d1
RDX: 0000000000000000 RSI: ffffffff8b6cfc80 RDI: ffffffff8bd369a0
RBP: ffffc90004b17a90 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90626a17 R11: 0000000000000000 R12: ffff8880b873fa30
R13: ffff8880668b2440 R14: 0000000000000000 R15: ffff8880b873ec00
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0xf4b/0x5890 kernel/sched/core.c:6765
 __schedule_loop kernel/sched/core.c:6842 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6857
 do_nanosleep+0x216/0x510 kernel/time/hrtimer.c:2141
 hrtimer_nanosleep+0x158/0x380 kernel/time/hrtimer.c:2188
 common_nsleep+0xa1/0xd0 kernel/time/posix-timers.c:1356
 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1402 [inline]
 __se_sys_clock_nanosleep kernel/time/posix-timers.c:1379 [inline]
 __x64_sys_clock_nanosleep+0x344/0x4a0 kernel/time/posix-timers.c:1379
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f95e7dbfa25
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 f6 54 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 4f 55 ff ff 48 8b 04 24 48 83 c4 28 f7 d8
RSP: 002b:00007ffdc5888400 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 00007f95e7fa5fa0 RCX: 00007f95e7dbfa25
RDX: 00007ffdc5888440 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f95e7fa7ba0 R08: 0000000000000000 R09: 00007f95e8c46000
R10: 0000000000000000 R11: 0000000000000293 R12: 000000000003a6e4
R13: 00007f95e7fa5fa0 R14: ffffffffffffffff R15: 00007ffdc5888580
 </TASK>
rcu: rcu_preempt kthread starved for 10506 jiffies! g41237 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:28248 pid:18    tgid:18    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5378 [inline]
 __schedule+0xf43/0x5890 kernel/sched/core.c:6765
 __schedule_loop kernel/sched/core.c:6842 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6857
 schedule_timeout+0x124/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2024
 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2226
 kthread+0x3af/0x750 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 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 UID: 0 PID: 13565 Comm: syz.0.3437 Not tainted 6.14.0-rc7-syzkaller-00074-ga7f2e10ecd8f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0x4c6/0x12c0 kernel/smp.c:885
Code: 0c 00 85 ed 74 4d 48 b8 00 00 00 00 00 fc ff df 4d 89 fc 4c 89 fd 49 c1 ec 03 83 e5 07 49 01 c4 83 c5 03 e8 ac 0e 0c 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 e8 0b 00 00 8b 43 08 31
RSP: 0018:ffffc90004c16e98 EFLAGS: 00000246
RAX: 0000000000080000 RBX: ffff8880b8744a80 RCX: ffffc9000cbda000
RDX: 0000000000080000 RSI: ffffffff81ade444 RDI: 0000000000000005
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000002 R12: ffffed10170e8951
R13: 0000000000000001 R14: ffff8880b863fe80 R15: ffff8880b8744a88
FS:  00007f95e8c246c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000006680 CR3: 00000000288f8000 CR4: 00000000003526f0
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:1052
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:966 [inline]
 arch_tlbbatch_flush+0x246/0x320 arch/x86/mm/tlb.c:1287
 try_to_unmap_flush mm/rmap.c:650 [inline]
 try_to_unmap_flush_dirty+0xb9/0x140 mm/rmap.c:661
 shrink_folio_list+0x2f66/0x40c0 mm/vmscan.c:1401
 reclaim_folio_list+0xd8/0x5e0 mm/vmscan.c:2183
 reclaim_pages+0x481/0x650 mm/vmscan.c:2220
 madvise_cold_or_pageout_pte_range+0x13ae/0x20d0 mm/madvise.c:558
 walk_pmd_range mm/pagewalk.c:130 [inline]
 walk_pud_range mm/pagewalk.c:226 [inline]
 walk_p4d_range mm/pagewalk.c:264 [inline]
 walk_pgd_range+0xc7b/0x1a70 mm/pagewalk.c:305
 __walk_page_range+0x161/0x820 mm/pagewalk.c:412
 walk_page_range_mm+0x55a/0x940 mm/pagewalk.c:505
 walk_page_range+0x63/0x90 mm/pagewalk.c:584
 madvise_pageout_page_range mm/madvise.c:617 [inline]
 madvise_pageout+0x326/0x820 mm/madvise.c:644
 madvise_vma_behavior+0x452/0x1de0 mm/madvise.c:1275
 madvise_walk_vmas+0x1cf/0x2c0 mm/madvise.c:1511
 do_madvise+0x366/0x7c0 mm/madvise.c:1698
 __do_sys_madvise mm/madvise.c:1714 [inline]
 __se_sys_madvise mm/madvise.c:1712 [inline]
 __x64_sys_madvise+0xa9/0x110 mm/madvise.c:1712
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f95e7d8d169
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:00007f95e8c24038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f95e7fa6080 RCX: 00007f95e7d8d169
RDX: 0000000000000015 RSI: 0000000000600000 RDI: 0000200000000000
RBP: 00007f95e7e0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f95e7fa6080 R15: 00007ffdc5888308
 </TASK>
vkms_vblank_simulate: vblank timer overrun