rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10506 jiffies, g=99209, q=228 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10506 (4295006768-4294996262), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10506 jiffies! g99209 f0x2 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:24944 pid:18    tgid:18    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5378 [inline]
 __schedule+0x18bc/0x4c40 kernel/sched/core.c:6765
 __schedule_loop kernel/sched/core.c:6842 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6857
 schedule_timeout+0x15a/0x290 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2024
 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2226
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/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:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 27630 Comm: syz.5.7944 Not tainted 6.14.0-rc6-syzkaller-00016-g0fed89a961ea #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__lock_acquire+0x1265/0x2100 kernel/locking/lockdep.c:5224
Code: 40 b5 2a 8c e8 3c b0 e4 ff 48 bf 00 00 00 00 00 fc ff df 90 0f 0b 90 90 90 31 db 48 83 c3 40 48 89 d8 48 c1 e8 03 80 3c 38 00 <74> 12 48 89 df e8 a1 b2 89 00 48 bf 00 00 00 00 00 fc ff df 48 83
RSP: 0018:ffffc90000a28a50 EFLAGS: 00000046
RAX: 1ffffffff27d4a2b RBX: ffffffff93ea5158 RCX: ffffffff819ce7a5
RDX: 0000000000000000 RSI: 0000000000000008 RDI: dffffc0000000000
RBP: 35a08aec8a9222e9 R08: ffffffff94517877 R09: 1ffffffff28a2f0e
R10: dffffc0000000000 R11: fffffbfff28a2f0f R12: ffff88802acc5a00
R13: ffff88802acc5a00 R14: 1ffff11005598ca7 R15: 0000000000000001
FS:  00007f63c1f316c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000400000000300 CR3: 00000000515d0000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
 _raw_spin_lock_irq+0xd3/0x120 kernel/locking/spinlock.c:170
 __run_hrtimer kernel/time/hrtimer.c:1805 [inline]
 __hrtimer_run_queues+0x670/0xd30 kernel/time/hrtimer.c:1865
 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1927
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x110/0x420 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 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:check_kcov_mode kernel/kcov.c:194 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x70 kernel/kcov.c:217
Code: 00 d5 03 00 65 8b 15 40 f6 41 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 2c 16 00 00 00 74 2c 8b 91 08 16 00 00 <83> fa 02 75 21 48 8b 91 10 16 00 00 48 8b 32 48 8d 7e 01 8b 89 0c
RSP: 0018:ffffc90004e9f178 EFLAGS: 00000246
RAX: ffffffff82032019 RBX: 00000000000001cb RCX: ffff88802acc5a00
RDX: 0000000000000002 RSI: ffff888062d713e0 RDI: ffff88802bb7f088
RBP: 00000000000001cb R08: 0000000000000000 R09: ffffffff82032cd9
R10: 0000000000000002 R11: ffff88802acc5a00 R12: ffff888062d713e0
R13: 1ffff920009d3e54 R14: 0000000000000000 R15: ffff888062d713e0
 shmem_allowable_huge_orders+0x29/0x420 mm/shmem.c:1756
 shmem_get_folio_gfp+0x564/0x1840 mm/shmem.c:2527
 shmem_fault+0x220/0x5b0 mm/shmem.c:2746
 __do_fault+0x135/0x390 mm/memory.c:4990
 do_read_fault mm/memory.c:5410 [inline]
 do_fault mm/memory.c:5544 [inline]
 do_pte_missing mm/memory.c:4060 [inline]
 handle_pte_fault mm/memory.c:5907 [inline]
 __handle_mm_fault+0x4c44/0x70f0 mm/memory.c:6050
 handle_mm_fault+0x2c1/0x7e0 mm/memory.c:6219
 faultin_page mm/gup.c:1196 [inline]
 __get_user_pages+0x1a92/0x4140 mm/gup.c:1491
 populate_vma_page_range+0x264/0x330 mm/gup.c:1929
 __mm_populate+0x27a/0x460 mm/gup.c:2032
 mm_populate include/linux/mm.h:3386 [inline]
 vm_mmap_pgoff+0x303/0x430 mm/util.c:580
 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: 0033:0x7f63c118d169
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:00007f63c1f31038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f63c13a5fa0 RCX: 00007f63c118d169
RDX: 0000000000000002 RSI: 0000000000b36000 RDI: 0000400000000000
RBP: 00007f63c120e2a0 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f63c13a5fa0 R15: 00007fff17c2b5a8
 </TASK>
vkms_vblank_simulate: vblank timer overrun