rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (1 GPs behind) idle=0c1c/1/0x4000000000000000 softirq=50564/50566 fqs=0 rcu: (detected by 0, t=10506 jiffies, g=43081, q=238 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 11073 Comm: syz.1.1275 Not tainted 6.17.0-rc1-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210 Code: 16 c8 55 00 48 89 df 5b e9 ed 4e 5b 00 be 03 00 00 00 5b e9 12 a8 27 03 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 8b 34 24 65 48 8b 15 e8 9c 1a 12 65 8b 05 f9 9c 1a RSP: 0018:ffffc90000a08d88 EFLAGS: 00000002 RAX: 0000000080010000 RBX: 0000000000000001 RCX: ffffffff89a754c7 RDX: ffff888029160000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffff888056e20c00 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 18692c1418000000 R13: 18692c1418000000 R14: 0000000000000000 R15: ffff888056e3f800 FS: 000055556d7e3500(0000) GS:ffff8881247bd000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2e393b6080 CR3: 0000000075a7a000 CR4: 00000000003526f0 Call Trace: advance_sched+0x6b7/0xc80 net/sched/sch_taprio.c:991 __run_hrtimer kernel/time/hrtimer.c:1761 [inline] __hrtimer_run_queues+0x202/0xad0 kernel/time/hrtimer.c:1825 hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1887 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline] __sysvec_apic_timer_interrupt+0x10b/0x3f0 arch/x86/kernel/apic/apic.c:1056 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0x9f/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:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216 Code: e9 ed 4e 5b 00 be 03 00 00 00 5b e9 12 a8 27 03 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 34 24 <65> 48 8b 15 e8 9c 1a 12 65 8b 05 f9 9c 1a 12 a9 00 01 ff 00 74 1d RSP: 0018:ffffc9000e307bd0 EFLAGS: 00000282 RAX: fffff52001c60fa1 RBX: ffffc9000e307cd0 RCX: ffffc9000e307d08 RDX: ffff888029160000 RSI: ffffffff81a82523 RDI: ffffc9000e307cd0 RBP: ffffc9000e307cd0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000e307cd0 R13: 0000000000000002 R14: dffffc0000000000 R15: 00007f32d25b5fac hrtimer_active+0x103/0x240 kernel/time/hrtimer.c:1686 hrtimer_try_to_cancel+0x25/0x2f0 kernel/time/hrtimer.c:1359 hrtimer_cancel+0x16/0x40 kernel/time/hrtimer.c:1488 futex_wait+0xfd/0x380 kernel/futex/waitwake.c:721 do_futex+0x229/0x350 kernel/futex/syscalls.c:102 __do_sys_futex kernel/futex/syscalls.c:179 [inline] __se_sys_futex kernel/futex/syscalls.c:160 [inline] __x64_sys_futex+0x1e0/0x4c0 kernel/futex/syscalls.c:160 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f32d238ebe9 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:00007ffdd4b848b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00000000000616f3 RCX: 00007f32d238ebe9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f32d25b5fac RBP: 0000000000000032 R08: 00007f32d32a1000 R09: 0000000fd4b84baf R10: 00007ffdd4b849b0 R11: 0000000000000246 R12: 00007f32d25b5fac R13: 00007ffdd4b849b0 R14: 0000000000061725 R15: 00007ffdd4b849d0 rcu: rcu_preempt kthread starved for 10506 jiffies! g43081 f0x0 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:28760 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1190/0x5de0 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:7058 schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2083 rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2285 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 UID: 0 PID: 11075 Comm: syz.4.1277 Not tainted 6.17.0-rc1-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_single+0x1f4/0x6b0 kernel/smp.c:687 Code: 00 00 00 66 44 89 ac 24 ce 00 00 00 48 89 de e8 82 fa ff ff 41 89 c5 0f 1f 44 00 00 e8 f5 ef 0b 00 eb 07 e8 ee ef 0b 00 f3 90 <8b> 9c 24 c8 00 00 00 31 ff 83 e3 01 89 de e8 19 eb 0b 00 85 db 75 RSP: 0018:ffffc9000c98fb40 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff81afa347 RDX: ffff88802e894880 RSI: ffffffff81afa332 RDI: 0000000000000005 RBP: ffffc9000c98fc90 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 1ffff92001931f70 R13: 0000000000000000 R14: 0000000000000001 R15: dffffc0000000000 FS: 00005555642e2500(0000) GS:ffff8881246bd000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c26b1dc CR3: 0000000035d8e000 CR4: 00000000003526f0 DR0: 0000000000000060 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: rcu_barrier kernel/rcu/tree.c:3867 [inline] rcu_barrier+0x28d/0x6e0 kernel/rcu/tree.c:3804 kvm_mmu_uninit_vm+0x85/0x90 arch/x86/kvm/mmu/mmu.c:6777 kvm_arch_destroy_vm+0x207/0x2f0 arch/x86/kvm/x86.c:12868 kvm_destroy_vm virt/kvm/kvm_main.c:1308 [inline] kvm_put_kvm+0x4f2/0xb40 virt/kvm/kvm_main.c:1344 kvm_vm_release+0x3c/0x50 virt/kvm/kvm_main.c:1367 __fput+0x3ff/0xb70 fs/file_table.c:468 task_work_run+0x150/0x240 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xeb/0x110 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x3f6/0x4c0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f812518ebe9 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:00007ffeb4dcbba8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00000000000616ef RCX: 00007f812518ebe9 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f81253b7da0 R08: 0000000000000001 R09: 00000009b4dcbe9f R10: 0000001b31120000 R11: 0000000000000246 R12: 00007f81253b5fac R13: 00007f81253b5fa0 R14: ffffffffffffffff R15: 00007ffeb4dcbcc0