rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 1, t=10502 jiffies, g=37181, q=2 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294983520-4294973018), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10502 jiffies! g37181 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:26144 pid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5245 [inline] __schedule+0x142d/0x4550 kernel/sched/core.c:6558 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6870 irqentry_exit+0x53/0x80 kernel/entry/common.c:439 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653 RIP: 0010:memory_is_nonzero mm/kasan/generic.c:101 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline] RIP: 0010:kasan_check_range+0x5f/0x290 mm/kasan/generic.c:189 Code: eb 03 49 b8 00 00 00 00 00 fc ff df 4e 8d 0c 03 4c 8d 54 37 ff 49 c1 ea 03 49 bb 01 00 00 00 00 fc ff df 4f 8d 34 1a 4c 89 f5 <4c> 29 cd 48 83 fd 10 7f 26 48 85 ed 0f 84 3a 01 00 00 49 f7 d2 49 RSP: 0018:ffffc90000157b70 EFLAGS: 00000a07 RAX: 0000000000000001 RBX: 1ffff11027fd8b28 RCX: ffffffff8a939aa6 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88813fec5940 RBP: ffffed1027fd8b29 R08: dffffc0000000000 R09: ffffed1027fd8b28 R10: 1ffff11027fd8b28 R11: dffffc0000000001 R12: ffff88813fec5940 R13: 1ffff9200002af78 R14: ffffed1027fd8b29 R15: dffffc0000000000 instrument_atomic_read include/linux/instrumented.h:72 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] test_ti_thread_flag include/linux/thread_info.h:118 [inline] need_resched include/linux/sched.h:2231 [inline] schedule+0xd6/0x180 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:308 rcu: Stack dump where RCU GP kthread last ran: CPU: 1 PID: 3546 Comm: syz-fuzzer Not tainted 6.1.94-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 RIP: 0010:finish_task_switch+0x1d3/0x810 kernel/sched/core.c:5124 Code: 2e 0b 00 48 83 c4 08 4c 89 f7 e8 98 30 00 00 e9 8f 04 00 00 4c 89 f7 e8 7b 23 36 09 e8 06 1e 32 00 fb 49 8d bc 24 f8 15 00 00 <48> 89 f8 48 c1 e8 03 49 bd 00 00 00 00 00 fc ff df 42 0f b6 04 28 RSP: 0018:ffffc90003a7f728 EFLAGS: 00000282 RAX: ce93112a268dd800 RBX: ffff8880b993b748 RCX: ffffffff91c95103 RDX: dffffc0000000000 RSI: ffffffff8aec0240 RDI: ffff88807e9395f8 RBP: ffffc90003a7f770 R08: dffffc0000000000 R09: ffffed1017307541 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88807e938000 R13: 1ffff110173276eb R14: ffff8880b983aa00 R15: ffff8880b993b758 FS: 000000c00005b890(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0563542fc0 CR3: 00000000779a3000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: context_switch kernel/sched/core.c:5248 [inline] __schedule+0x1435/0x4550 kernel/sched/core.c:6558 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6870 irqentry_exit+0x53/0x80 kernel/entry/common.c:439 asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:658 RIP: 0010:preempt_count_add+0x30/0x180 kernel/sched/core.c:5703 Code: fb 48 c7 c0 60 51 c9 91 48 c1 e8 03 49 bf 00 00 00 00 00 fc ff df 42 0f b6 04 38 84 c0 0f 85 e2 00 00 00 83 3d 60 f0 6a 10 00 <75> 07 65 8b 05 3f 0e a4 7e 65 01 1d 38 0e a4 7e 48 c7 c0 60 51 c9 RSP: 0018:ffffc90003a7fab0 EFLAGS: 00000246 RAX: 0000000000000004 RBX: 0000000000000001 RCX: ffffffff91c95103 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001 RBP: 1ffff1100fd272ed R08: dffffc0000000000 R09: ffffed100fd27001 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88807e938000 R13: ffffc90003a7fc68 R14: ffff88807e939278 R15: dffffc0000000000 schedule+0xb8/0x180 kernel/sched/core.c:6633 futex_wait_queue+0x149/0x1d0 kernel/futex/waitwake.c:355 futex_wait+0x203/0x5c0 kernel/futex/waitwake.c:656 do_futex+0x3b5/0x490 kernel/futex/syscalls.c:106 __do_sys_futex kernel/futex/syscalls.c:183 [inline] __se_sys_futex+0x3d7/0x460 kernel/futex/syscalls.c:164 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: 0033:0x473523 Code: 24 20 c3 cc cc cc cc 48 8b 7c 24 08 8b 74 24 10 8b 54 24 14 4c 8b 54 24 18 4c 8b 44 24 20 44 8b 4c 24 28 b8 ca 00 00 00 0f 05 <89> 44 24 30 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc RSP: 002b:000000c00008be58 EFLAGS: 00000286 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000473523 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000c00005b948 RBP: 000000c00008bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000444fa0 R13: 000000c000a517a4 R14: 000000c0000bd860 R15: 0000000000000000