rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=7354/1/0x4000000000000000 softirq=59140/59148 fqs=1 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P17264/1:b..l rcu: (detected by 1, t=10502 jiffies, g=55809, q=686 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 17278 Comm: syz.7.3314 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__lock_release kernel/locking/lockdep.c:5514 [inline] RIP: 0010:lock_release+0xba/0x3b0 kernel/locking/lockdep.c:5889 Code: 02 00 00 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 48 8b 5c 24 20 fa 48 c7 c7 93 0a 78 8d e8 ed 03 ab 09 65 ff 05 36 d9 d8 10 44 24 20 01 00 00 00 83 3d 47 2f e2 0d 00 0f 84 90 01 00 00 41 RSP: 0018:ffffc90000007c18 EFLAGS: 00000002 RAX: 0000000000000000 RBX: 0000000000000006 RCX: bdd922227ef69700 RDX: ffff888030ddde10 RSI: ffffffff8d780a93 RDI: ffffffff8bbfc660 RBP: ffffc90000007d08 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52000000f74 R12: dffffc0000000000 R13: ffffffff81aef5fd R14: ffffffff99a15088 R15: ffff888029081e80 FS: 00007f0244ff66c0(0000) GS:ffff8881260b1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0244ff5f98 CR3: 000000007d5ee000 CR4: 00000000003526f0 Call Trace: __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline] _raw_spin_unlock_irqrestore+0x70/0x110 kernel/locking/spinlock.c:194 debug_hrtimer_deactivate kernel/time/hrtimer.c:443 [inline] debug_deactivate+0x1d/0x1e0 kernel/time/hrtimer.c:483 __run_hrtimer kernel/time/hrtimer.c:1745 [inline] __hrtimer_run_queues+0x2b0/0xc30 kernel/time/hrtimer.c:1841 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x102/0x3e0 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:80 [inline] RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:102 [inline] RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:227 [inline] RIP: 0010:unwind_next_frame+0x130e/0x2390 arch/x86/kernel/unwind_orc.c:494 Code: c1 e8 3f 48 01 c8 48 83 e0 fe 4c 8d 3c 45 00 00 00 00 49 01 ef 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 <84> c0 75 27 49 63 07 4c 01 f8 49 8d 4f 04 4c 39 e0 48 0f 46 e9 49 RSP: 0018:ffffc9000f37f7b8 EFLAGS: 00000a02 RAX: 0000000000000000 RBX: ffffffff8feff618 RCX: dffffc0000000000 RDX: ffffffff8feff5f8 RSI: ffffffff9096c76e RDI: ffffffff8bbfc600 RBP: ffffffff8feff5f8 R08: 0000000000000009 R09: ffffffff8df41cc0 R10: ffffc9000f37f8d8 R11: ffffffff81ad4ad0 R12: ffffffff891e4a4d R13: ffffffff8feff5f8 R14: ffffc9000f37f888 R15: ffffffff8feff608 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 unpoison_slab_object mm/kasan/common.c:342 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:368 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4948 [inline] slab_alloc_node mm/slub.c:5258 [inline] kmem_cache_alloc_noprof+0x367/0x6f0 mm/slub.c:5265 lsm_file_alloc security/security.c:169 [inline] security_file_alloc+0x34/0x330 security/security.c:2380 init_file+0x93/0x2f0 fs/file_table.c:159 alloc_empty_file+0x6e/0x1d0 fs/file_table.c:241 alloc_file fs/file_table.c:354 [inline] alloc_file_pseudo+0x13d/0x210 fs/file_table.c:383 sock_alloc_file+0xb8/0x2e0 net/socket.c:483 sock_map_fd net/socket.c:508 [inline] __sys_socket+0x13e/0x320 net/socket.c:1747 __do_sys_socket net/socket.c:1752 [inline] __se_sys_socket net/socket.c:1750 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1750 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0246d8f749 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:00007f0244ff6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007f0246fe6180 RCX: 00007f0246d8f749 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000010 RBP: 00007f0246e13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0246fe6218 R14: 00007f0246fe6180 R15: 00007ffc04a5afc8 task:syz.5.3311 state:R running task stack:27192 pid:17264 tgid:17259 ppid:7458 task_flags:0x400140 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5256 [inline] __schedule+0x14bc/0x5000 kernel/sched/core.c:6863 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7190 irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lock_release+0x2a6/0x3b0 kernel/locking/lockdep.c:5893 Code: 4d 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 75 52 f7 c3 00 02 00 00 74 01 fb 65 48 8b 05 fa 92 d8 10 <48> 3b 44 24 28 75 75 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d c3 RSP: 0018:ffffc9000f12f958 EFLAGS: 00000206 RAX: 8cfe30bf17fcb900 RBX: 0000000000000202 RCX: 8cfe30bf17fcb900 RDX: 0000000000000001 RSI: ffffffff8d9520e6 RDI: ffffffff8bbfc660 RBP: ffff88802f1b8b58 R08: ffff8880574fe783 R09: 1ffff1100ae9fcf0 R10: dffffc0000000000 R11: ffffed100ae9fcf1 R12: 0000000000000001 R13: 0000000000000001 R14: ffffffff8df41cc0 R15: ffff88802f1b8000 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:897 [inline] pte_unmap include/linux/pgtable.h:136 [inline] follow_page_pte+0xcfe/0x13e0 mm/gup.c:889 follow_pmd_mask mm/gup.c:-1 [inline] follow_pud_mask mm/gup.c:967 [inline] follow_p4d_mask mm/gup.c:984 [inline] follow_page_mask mm/gup.c:1023 [inline] __get_user_pages+0xa78/0x2a00 mm/gup.c:1426 populate_vma_page_range+0x29f/0x3a0 mm/gup.c:1860 __mm_populate+0x24c/0x380 mm/gup.c:1963 mm_populate include/linux/mm.h:3455 [inline] vm_mmap_pgoff+0x387/0x4d0 mm/util.c:586 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9f0db8f749 RSP: 002b:00007f9f0bdd5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f9f0dde6090 RCX: 00007f9f0db8f749 RDX: 0000000000000009 RSI: 0000000000c00000 RDI: 0000200000001000 RBP: 00007f9f0dc13f91 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000003032 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9f0dde6128 R14: 00007f9f0dde6090 R15: 00007fffefcb9b68 rcu: rcu_preempt kthread timer wakeup didn't happen for 10499 jiffies! g55809 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=22636 rcu: rcu_preempt kthread starved for 10500 jiffies! g55809 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:27272 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5256 [inline] __schedule+0x14bc/0x5000 kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0x165/0x360 kernel/sched/core.c:6960 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246