rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P4257/1:b..l P8989/1:b..l
(detected by 0, t=10502 jiffies, g=45969, q=767 ncpus=2)
task:syz.8.1114 state:R running task stack:24728 pid:8989 ppid:7208 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5243 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6560
preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6872
irqentry_exit+0x53/0x80 kernel/entry/common.c:439
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:820 [inline]
RIP: 0010:count_memcg_event_mm+0x330/0x410 include/linux/memcontrol.h:1099
Code: a6 af bd ff 4c 8b 6c 24 18 eb 1f e8 9a af bd ff e8 a5 87 e4 08 4d 85 f6 74 84 e8 8b af bd ff fb 49 be 00 00 00 00 00 fc ff df 4b 8d e4 08 89 c3 31 ff 89 c6 e8 d0 b2 bd ff 85 db 74 10 e8 97
RSP: 0018:ffffc900046e77e0 EFLAGS: 00000246
RAX: ffffffff81ccfa35 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc900122f0000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc900046e78b0 R08: ffffffff81ccf9a5 R09: fffffbfff2257253
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000046
R13: ffffffff81ccf7a0 R14: dffffc0000000000 R15: 1ffff920008dcf00
handle_mm_fault+0x15b/0x5340 mm/memory.c:5272
faultin_page mm/gup.c:1026 [inline]
__get_user_pages+0x4f3/0x1190 mm/gup.c:1250
populate_vma_page_range+0x217/0x2b0 mm/gup.c:1607
__mm_populate+0x275/0x440 mm/gup.c:1721
mm_populate include/linux/mm.h:2823 [inline]
vm_mmap_pgoff+0x22b/0x2d0 mm/util.c:525
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3846f8d169
RSP: 002b:00007f3847e3f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f38471a5fa0 RCX: 00007f3846f8d169
RDX: b635773f06ebbeef RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007f384700e2a0 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f38471a5fa0 R15: 00007ffea657e388
task:syz-executor state:R running task stack:20016 pid:4257 ppid:4246 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5243 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6560
preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6872
irqentry_exit+0x53/0x80 kernel/entry/common.c:439
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:lock_acquire+0x26f/0x5a0 kernel/locking/lockdep.c:5666
Code: 2b 00 74 08 4c 89 f7 e8 4f 55 77 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:ffffc900041a7400 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 1ffff92000834e8c RCX: 1ffff92000834e2c
RDX: dffffc0000000000 RSI: ffffffff8b0c2ec0 RDI: ffffffff8b5f6f80
RBP: ffffc900041a7558 R08: dffffc0000000000 R09: fffffbfff225724d
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff92000834e88
R13: dffffc0000000000 R14: ffffc900041a7460 R15: 0000000000000246
rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
rcu_read_lock include/linux/rcupdate.h:791 [inline]
page_ext_get+0x39/0x2a0 mm/page_ext.c:157
__reset_page_owner+0x32/0x1a0 mm/page_owner.c:144
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1459 [inline]
free_pcp_prepare mm/page_alloc.c:1509 [inline]
free_unref_page_prepare+0x12a6/0x15b0 mm/page_alloc.c:3384
free_unref_page_list+0x663/0x900 mm/page_alloc.c:3525
release_pages+0x24c4/0x27a0 mm/swap.c:1035
__pagevec_release+0x80/0xf0 mm/swap.c:1055
pagevec_release include/linux/pagevec.h:71 [inline]
folio_batch_release include/linux/pagevec.h:135 [inline]
shmem_undo_range+0x865/0x2390 mm/shmem.c:946
shmem_truncate_range mm/shmem.c:1062 [inline]
shmem_evict_inode+0x265/0xa60 mm/shmem.c:1171
evict+0x529/0x930 fs/inode.c:705
do_unlinkat+0x509/0x820 fs/namei.c:4397
__do_sys_unlink fs/namei.c:4438 [inline]
__se_sys_unlink fs/namei.c:4436 [inline]
__x64_sys_unlink+0x45/0x50 fs/namei.c:4436
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f5ea078c717
RSP: 002b:00007ffdcedeee08 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5ea078c717
RDX: 00007ffdcedeee30 RSI: 00007ffdcedeeec0 RDI: 00007ffdcedeeec0
RBP: 00007ffdcedeeec0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffdcedeff50
R13: 00007f5ea080e08c R14: 00000000000745bd R15: 00007ffdcedeff90
rcu: rcu_preempt kthread timer wakeup didn't happen for 10405 jiffies! g45969 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=34252
rcu: rcu_preempt kthread starved for 10406 jiffies! g45969 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:25880 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5243 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6560
schedule+0xbf/0x180 kernel/sched/core.c:6636
schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1965
rcu_gp_fqs_loop+0x2d2/0x1150 kernel/rcu/tree.c:1706
rcu_gp_kthread+0xa3/0x3b0 kernel/rcu/tree.c:1905
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.1.131-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:22 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:130 [inline]
RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:112 [inline]
RIP: 0010:acpi_idle_do_entry+0x10f/0x340 drivers/acpi/processor_idle.c:567
Code: ba ce f6 48 83 e3 08 0f 85 0b 01 00 00 4c 8d 74 24 20 e8 f4 76 d5 f6 0f 1f 44 00 00 e8 1a b6 ce f6 0f 00 2d 73 c4 ad 00 fb f4 <4c> 89 f3 48 c1 eb 03 42 80 3c 3b 00 74 08 4c 89 f7 e8 bb 17 26 f7
RSP: 0018:ffffffff8d007b20 EFLAGS: 000002d3
RAX: ffffffff8abbf3a6 RBX: 0000000000000000 RCX: ffffffff8d0bd980
RDX: 0000000000000000 RSI: ffffffff8b0c1d40 RDI: ffffffff8b5f6f80
RBP: ffffffff8d007bb0 R08: ffffffff8abbf388 R09: fffffbfff1a17b31
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffffffff1a00f64
R13: ffff88801d6e7804 R14: ffffffff8d007b40 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc86ad5eb8 CR3: 0000000079efc000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
acpi_idle_enter+0x352/0x4f0 drivers/acpi/processor_idle.c:704
cpuidle_enter_state+0x516/0xf80 drivers/cpuidle/cpuidle.c:239
cpuidle_enter+0x59/0x90 drivers/cpuidle/cpuidle.c:356
call_cpuidle kernel/sched/idle.c:155 [inline]
cpuidle_idle_call kernel/sched/idle.c:236 [inline]
do_idle+0x3ce/0x680 kernel/sched/idle.c:303
cpu_startup_entry+0x3d/0x60 kernel/sched/idle.c:401
rest_init+0x2da/0x300 init/main.c:733
arch_call_rest_init+0xa/0xa init/main.c:893
start_kernel+0x496/0x53f init/main.c:1140
secondary_startup_64_no_verify+0xcf/0xdb