rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=29561, q=124 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 10496 (4294974303-4294963807), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10496 jiffies! g29561 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:27032 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:constant_test_bit arch/x86/include/asm/bitops.h:207 [inline] RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:239 [inline] RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline] RIP: 0010:test_ti_thread_flag include/linux/thread_info.h:118 [inline] RIP: 0010:need_resched include/linux/sched.h:2231 [inline] RIP: 0010:schedule+0xdb/0x180 kernel/sched/core.c:6636 Code: 00 00 e8 48 19 cb f6 31 ff e8 f1 b9 ff ff bf 01 00 00 00 e8 b7 1a cb f6 4c 89 e7 be 08 00 00 00 e8 fa cc 4e f7 42 80 3c 3b 00 <74> c7 4c 89 e7 e8 5b cb 4e f7 eb bd 4d 89 e6 49 83 c6 2c 4c 89 f0 RSP: 0018:ffffc90000157b98 EFLAGS: 00000246 RAX: 0000000000000001 RBX: 1ffff11027fddb28 RCX: ffffffff8a933926 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88813feed940 RBP: ffffc90000157cb0 R08: dffffc0000000000 R09: ffffed1027fddb29 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88813feed940 R13: 1ffff9200002af78 R14: ffff88813feeebb8 R15: dffffc0000000000 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: 0 PID: 7048 Comm: syz-executor.0 Not tainted 6.1.90-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 RIP: 0010:finish_task_switch+0x1d3/0x810 kernel/sched/core.c:5124 Code: 37 0b 00 48 83 c4 08 4c 89 f7 e8 98 30 00 00 0f 1f 44 00 00 4c 89 f7 e8 7b d0 35 09 e8 36 26 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:ffffc9000559f8a8 EFLAGS: 00000286 RAX: 9fbefa59e7adfe00 RBX: ffff8880186c8034 RCX: ffffffff91c93103 RDX: dffffc0000000000 RSI: ffffffff8aec01c0 RDI: ffff888072d6b3b8 RBP: ffffc9000559f8f0 R08: dffffc0000000000 R09: ffffed1017307541 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888072d69dc0 R13: 1ffff110173076eb R14: ffff8880b983aa00 R15: ffff8880b983b758 FS: 00007f7bb13ca6c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31f23000 CR3: 000000007d7fe000 CR4: 00000000003506f0 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 schedule+0xbf/0x180 kernel/sched/core.c:6634 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: 0033:0x7f7bb067dd69 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7bb13ca178 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007f7bb07ac058 RCX: 00007f7bb067dd69 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f7bb07ac058 RBP: 00007f7bb07ac050 R08: 00007f7bb13ca6c0 R09: 00007f7bb13ca6c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7bb07ac05c R13: 000000000000006e R14: 00007fffba9c06e0 R15: 00007fffba9c07c8