rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (0 ticks this GP) idle=ca2c/1/0x4000000000000000 softirq=68807/68807 fqs=0 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P12325/1:b..l rcu: (detected by 1, t=10502 jiffies, g=58189, q=382 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 13832 Comm: syz.7.2789 Not tainted 6.16.0-rc2-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:__kasan_check_byte+0x2f/0x40 mm/kasan/common.c:561 Code: 56 53 48 89 f3 49 89 fe e8 5e 14 00 00 84 c0 75 16 be 01 00 00 00 4c 89 f7 31 d2 48 89 d9 89 c3 e8 c6 03 00 00 89 d8 5b 41 5e a7 90 ec fe cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 RSP: 0018:ffffc90000007b38 EFLAGS: 00000002 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 1610e9b663f47b00 RDX: 0000000000000000 RSI: ffffffff8b68d927 RDI: 1ffffffff3391205 RBP: ffffffff84c7a26b R08: 0000000000000001 R09: 0000000000000000 R10: dffffc0000000000 R11: fffff52000000f96 R12: 0000000000000000 R13: ffffffff99c89028 R14: 0000000000000000 R15: 0000000000000001 FS: 00007fb59e5346c0(0000) GS:ffff888125c51000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa8d50e56c0 CR3: 000000004bfe7000 CR4: 0000000000350ef0 Call Trace: kasan_check_byte include/linux/kasan.h:399 [inline] lock_acquire+0x8d/0x360 kernel/locking/lockdep.c:5845 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xa7/0xf0 kernel/locking/spinlock.c:162 debug_object_activate+0xbb/0x420 lib/debugobjects.c:818 debug_hrtimer_activate kernel/time/hrtimer.c:445 [inline] debug_activate kernel/time/hrtimer.c:484 [inline] enqueue_hrtimer+0x30/0x3a0 kernel/time/hrtimer.c:1088 __run_hrtimer kernel/time/hrtimer.c:1778 [inline] __hrtimer_run_queues+0x656/0xc60 kernel/time/hrtimer.c:1825 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline] __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1056 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline] RIP: 0010:write_comp_data kernel/kcov.c:245 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp1+0x8/0x90 kernel/kcov.c:300 Code: 20 e9 e7 e1 4f ff cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 14 25 08 f0 9c 92 65 8b 0d d8 90 dc 10 81 e1 00 01 ff 00 RSP: 0018:ffffc9000506f598 EFLAGS: 00000246 RAX: ffffffff81fbf1a2 RBX: 0000000000000000 RCX: 0000000000000002 RDX: ffff88802bf93c00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000506f690 R08: ffffea00010d3277 R09: 1ffffd400021a64e R10: dffffc0000000000 R11: fffff9400021a64f R12: 0000000000000000 R13: ffffea00010d3240 R14: 0000000000000001 R15: 0200000000000000 folios_put_refs+0x252/0x640 mm/swap.c:964 folios_put include/linux/mm.h:1415 [inline] folio_batch_move_lru+0x319/0x3a0 mm/swap.c:175 __folio_batch_add_and_move+0x5ad/0xd20 mm/swap.c:196 shmem_alloc_and_add_folio+0xcb3/0xf60 mm/shmem.c:1949 shmem_get_folio_gfp+0x59d/0x1660 mm/shmem.c:2532 shmem_get_folio mm/shmem.c:2638 [inline] shmem_write_begin+0xf7/0x2b0 mm/shmem.c:3288 generic_perform_write+0x2c7/0x910 mm/filemap.c:4112 shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3463 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x54b/0xa90 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb59d78d3df Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48 RSP: 002b:00007fb59e533df0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00000000013bd7ef RCX: 00007fb59d78d3df RDX: 00000000013bd7ef RSI: 00007fb593000000 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000005542 R10: 00002000000058c2 R11: 0000000000000293 R12: 0000000000000003 R13: 00007fb59e533ef0 R14: 00007fb59e533eb0 R15: 00007fb593000000 task:syz-executor state:R running task stack:18984 pid:12325 tgid:12325 ppid:12316 task_flags:0x400140 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5396 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6785 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7108 irqentry_exit+0x6f/0x90 kernel/entry/common.c:307 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:406 [inline] RIP: 0010:unwind_next_frame+0xc52/0x2390 arch/x86/kernel/unwind_orc.c:585 Code: 96 c0 20 c8 3c 01 0f 85 df 0c 00 00 48 89 df e8 84 23 00 00 48 89 c3 48 bd 00 00 00 00 00 fc ff df 48 8b 44 24 30 80 3c 28 00 <4c> 8b 7c 24 18 74 08 4c 89 ff e8 9f 34 b1 00 49 89 1f 48 8b 44 24 RSP: 0018:ffffc90003a5f1d8 EFLAGS: 00000246 RAX: 1ffff9200074be5e RBX: ffffffff82134c88 RCX: 1ffff9200074be01 RDX: ffffffff903c39e0 RSI: 0000000000000002 RDI: ffffc90003a5f760 RBP: dffffc0000000000 R08: 0000000000000001 R09: ffffffff81729af5 R10: dffffc0000000000 R11: ffffffff81acf690 R12: ffffc90003a60000 R13: 1ffff9200074be57 R14: ffffc90003a5f2a8 R15: ffffc90003a58000 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 save_stack+0xf5/0x1f0 mm/page_owner.c:156 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:308 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1248 [inline] __free_frozen_pages+0xc71/0xe70 mm/page_alloc.c:2706 ___free_pages_bulk mm/kasan/shadow.c:332 [inline] __kasan_populate_vmalloc mm/kasan/shadow.c:375 [inline] kasan_populate_vmalloc+0x118/0x1a0 mm/kasan/shadow.c:417 alloc_vmap_area+0xd51/0x1490 mm/vmalloc.c:2084 __get_vm_area_node+0x1f8/0x300 mm/vmalloc.c:3179 __vmalloc_node_range_noprof+0x301/0x12f0 mm/vmalloc.c:3845 __vmalloc_node_noprof+0xc2/0x110 mm/vmalloc.c:3948 alloc_thread_stack_node kernel/fork.c:317 [inline] dup_task_struct+0x3e7/0x860 kernel/fork.c:877 copy_process+0x54b/0x3c00 kernel/fork.c:1999 kernel_clone+0x21e/0x870 kernel/fork.c:2599 __do_sys_clone kernel/fork.c:2742 [inline] __se_sys_clone kernel/fork.c:2726 [inline] __x64_sys_clone+0x18b/0x1e0 kernel/fork.c:2726 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa8d4385193 RSP: 002b:00007ffec08effd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa8d4385193 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: 0000555564b3c7d0 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000000927c0 R14: 0000000000070a2e R15: 00007ffec08f0170 rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g58189 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=31632 rcu: rcu_preempt kthread starved for 10502 jiffies! g58189 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:27080 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5396 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6785 __schedule_loop kernel/sched/core.c:6863 [inline] schedule+0x165/0x360 kernel/sched/core.c:6878 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2054 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2256 kthread+0x711/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245