rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (0 ticks this GP) idle=e15c/1/0x4000000000000000 softirq=30671/30671 fqs=0 rcu: (detected by 1, t=10502 jiffies, g=26653, q=332 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 5816 Comm: syz-executor Not tainted 6.14.0-rc1-syzkaller-00028-g5c8c229261f1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 RIP: 0010:__preempt_count_sub arch/x86/include/asm/preempt.h:84 [inline] RIP: 0010:preempt_count_sub+0x5a/0x160 kernel/sched/core.c:5894 Code: 85 df 00 00 00 8b 0d 95 64 03 19 85 c9 75 1b 65 8b 05 32 e5 7b 7e 89 c2 81 e2 ff ff ff 7f 39 d3 7f 17 81 fb fe 00 00 00 76 71 db 65 01 1d 15 e5 7b 7e 5b c3 cc cc cc cc 90 e8 b1 34 39 03 85 RSP: 0018:ffffc90000007d18 EFLAGS: 00000002 RAX: 0000000080010002 RBX: 0000000000000001 RCX: 0000000000000000 RDX: 0000000000010002 RSI: 0000000000000004 RDI: 0000000000000001 RBP: 0000000000000002 R08: 0000000000000000 R09: fffffbfff355b448 R10: ffffffff9aada243 R11: 0000000000000001 R12: 0000000000000001 R13: dffffc0000000000 R14: ffff8880320c5340 R15: 1ffff92000000faa FS: 000055558f8fe500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7e09d762d8 CR3: 000000006158a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0x3b/0x80 kernel/locking/spinlock.c:194 debug_object_deactivate+0x1ef/0x370 lib/debugobjects.c:888 debug_hrtimer_deactivate kernel/time/hrtimer.c:460 [inline] debug_deactivate kernel/time/hrtimer.c:502 [inline] __run_hrtimer kernel/time/hrtimer.c:1769 [inline] __hrtimer_run_queues+0x47c/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 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:stack_trace_save+0x5d/0xd0 kernel/stacktrace.c:114 Code: 10 40 9a a5 81 48 01 c3 c7 03 f1 f1 f1 f1 c7 43 04 00 00 00 f3 c7 43 08 f3 f3 f3 f3 65 48 8b 04 25 28 00 00 00 48 89 44 24 78 <31> c0 8d 42 01 48 89 7c 24 20 48 c7 c7 40 97 a5 81 48 c7 44 24 30 RSP: 0018:ffffc900037e79d8 EFLAGS: 00000282 RAX: 2f573cc225434900 RBX: fffff520006fcf3b RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000040 RDI: ffffc900037e7a68 RBP: 0000000000000cc0 R08: 0000000000000002 R09: 0000000000000000 R10: ffff88807943afe8 R11: 00000000ffffffff R12: 0000000000000001 R13: 0000000000000cc0 R14: 0000000000000138 R15: 0000000000000001 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4115 [inline] slab_alloc_node mm/slub.c:4164 [inline] kmem_cache_alloc_lru_noprof+0x226/0x3d0 mm/slub.c:4183 __d_alloc+0x31/0xaa0 fs/dcache.c:1664 d_alloc_pseudo+0x1c/0xc0 fs/dcache.c:1795 alloc_path_pseudo fs/file_table.c:354 [inline] alloc_file_pseudo+0xd0/0x1f0 fs/file_table.c:370 sock_alloc_file+0x50/0x1d0 net/socket.c:470 sock_map_fd net/socket.c:495 [inline] __sys_socket+0x1c2/0x260 net/socket.c:1694 __do_sys_socket net/socket.c:1699 [inline] __se_sys_socket net/socket.c:1697 [inline] __x64_sys_socket+0x72/0xb0 net/socket.c:1697 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: 0033:0x7f7e09b8ed07 Code: f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 b8 29 00 00 00 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:00007ffdf993cde8 EFLAGS: 00000206 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007f7e09b8ed07 RDX: 0000000000000006 RSI: 0000000000000001 RDI: 000000000000000a RBP: 00007ffdf993d51c R08: 00007ffdf993ce0c R09: 0079746972756365 R10: 00007ffdf993ce70 R11: 0000000000000206 R12: 00007f7e09d77c80 R13: 00000000000927c0 R14: 00000000000279c7 R15: 00007f7e09d79e40 rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g26653 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=9280 rcu: rcu_preempt kthread starved for 10502 jiffies! g26653 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:27456 pid:17 tgid:17 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5377 [inline] __schedule+0xf43/0x5890 kernel/sched/core.c:6764 __schedule_loop kernel/sched/core.c:6841 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6856 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