Warning: Permanently added '10.128.0.167' (ED25519) to the list of known hosts. executing program executing program executing program executing program executing program syzkaller login: [ 177.508089][ C1] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: [ 177.515313][ C1] (detected by 1, t=10502 jiffies, g=5685, q=23) [ 177.521753][ C1] rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294954868-4294944366), jiffies_till_next_fqs=1, root ->qsmask 0x0 [ 177.535163][ C1] rcu: rcu_preempt kthread starved for 10502 jiffies! g5685 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 [ 177.546459][ C1] rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. [ 177.556461][ C1] rcu: RCU grace-period kthread stack dump: [ 177.562384][ C1] task:rcu_preempt state:R running task stack:27848 pid: 15 ppid: 2 flags:0x00004000 [ 177.573404][ C1] Call Trace: [ 177.576706][ C1] [ 177.579660][ C1] __schedule+0x11bb/0x4390 [ 177.584224][ C1] ? _raw_spin_lock_irqsave+0x7f/0xf0 [ 177.589626][ C1] ? _raw_spin_unlock_irqrestore+0x82/0x100 [ 177.595569][ C1] ? _raw_spin_unlock_irqrestore+0xaa/0x100 [ 177.601527][ C1] ? _raw_spin_unlock+0x40/0x40 [ 177.606458][ C1] ? rcu_is_watching+0x11/0xa0 [ 177.611257][ C1] ? release_firmware_map_entry+0x190/0x190 [ 177.617281][ C1] schedule+0x11b/0x1e0 [ 177.621470][ C1] schedule_timeout+0x15c/0x280 [ 177.626352][ C1] ? console_conditional_schedule+0x40/0x40 [ 177.632281][ C1] ? update_process_times+0x200/0x200 [ 177.637709][ C1] ? prepare_to_swait_event+0x331/0x350 [ 177.643312][ C1] rcu_gp_fqs_loop+0x29e/0x11b0 [ 177.648207][ C1] ? lockdep_hardirqs_on+0x94/0x140 [ 177.653785][ C1] ? rcu_gp_init+0xd58/0x10e0 [ 177.658493][ C1] ? rcu_gp_init+0x10e0/0x10e0 [ 177.663290][ C1] ? _raw_spin_unlock_irq+0x1f/0x40 [ 177.668558][ C1] ? lockdep_hardirqs_on+0x94/0x140 [ 177.674433][ C1] rcu_gp_kthread+0x98/0x350 [ 177.679069][ C1] ? rcu_report_qs_rsp+0x1a0/0x1a0 [ 177.684207][ C1] ? _raw_spin_unlock_irqrestore+0xaa/0x100 [ 177.690246][ C1] ? __kthread_parkme+0x157/0x1b0 [ 177.695311][ C1] kthread+0x436/0x520 [ 177.699413][ C1] ? rcu_report_qs_rsp+0x1a0/0x1a0 [ 177.704569][ C1] ? kthread_blkcg+0xd0/0xd0 [ 177.709180][ C1] ret_from_fork+0x1f/0x30 [ 177.713693][ C1] [ 177.716733][ C1] rcu: Stack dump where RCU GP kthread last ran: [ 177.723073][ C1] Sending NMI from CPU 1 to CPUs 0: [ 177.728299][ C0] NMI backtrace for cpu 0 [ 177.728328][ C0] CPU: 0 PID: 4197 Comm: syz-executor163 Not tainted syzkaller #0 [ 177.728346][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 [ 177.728360][ C0] RIP: 0010:__lock_task_sighand+0x268/0x290 [ 177.728390][ C0] Code: 8e 7e 2d 00 eb 24 e8 87 7e 2d 00 c6 05 fc 87 0b 0c 01 48 c7 c7 20 3c 0a 8a be 01 03 00 00 48 c7 c2 c0 3c 0a 8a e8 a8 39 54 08 e3 0e 1a 00 e8 be 60 01 00 4c 89 f8 48 83 c4 08 5b 41 5c 41 5d [ 177.728404][ C0] RSP: 0018:ffffc90000007c20 EFLAGS: 00000006 [ 177.728419][ C0] RAX: ffffffff814a4b90 RBX: 0000000000000001 RCX: ffff88801a5dbb80 [ 177.728432][ C0] RDX: 0000000000010000 RSI: ffffffff8a59a4a0 RDI: ffffffff8a59a460 [ 177.728444][ C0] RBP: dffffc0000000000 R08: 0000000000000004 R09: 0000000000000003 [ 177.728454][ C0] R10: fffff52000000f60 R11: 1ffff92000000f60 R12: ffff888077368940 [ 177.728467][ C0] R13: ffff88801a7b8928 R14: 1ffff110034f7125 R15: ffff888077368940 [ 177.728480][ C0] FS: 00007f9c5131a6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 [ 177.728495][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 177.728506][ C0] CR2: 00007f9c51319d80 CR3: 000000007825f000 CR4: 00000000003506f0 [ 177.728521][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 177.728531][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 177.728541][ C0] Call Trace: [ 177.728556][ C0] [ 177.728564][ C0] send_sigqueue+0x177/0x620 [ 177.728584][ C0] posix_timer_fn+0x16a/0x3d0 [ 177.728606][ C0] __hrtimer_run_queues+0x53d/0xc40 [ 177.728629][ C0] ? common_timer_wait_running+0x10/0x10 [ 177.728653][ C0] ? hrtimer_interrupt+0x8d0/0x8d0 [ 177.728671][ C0] ? ktime_get_update_offsets_now+0x3ce/0x3e0 [ 177.728700][ C0] hrtimer_interrupt+0x3bb/0x8d0 [ 177.728729][ C0] __sysvec_apic_timer_interrupt+0x137/0x4a0 [ 177.728747][ C0] sysvec_apic_timer_interrupt+0x9b/0xc0 [ 177.728766][ C0] [ 177.728771][ C0] [ 177.728776][ C0] asm_sysvec_apic_timer_interrupt+0x16/0x20 [ 177.728804][ C0] RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 [ 177.728820][ C0] Code: f6 ff 0f 1f 00 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 ae dc a9 f7 48 89 df e8 76 b1 aa f7 e8 11 4b cb f7 fb bf 01 00 00 00 b6 d4 9e f7 65 8b 05 97 d2 4f 76 85 c0 74 02 5b c3 e8 44 dd 4d [ 177.728833][ C0] RSP: 0018:ffffc900022c7bc0 EFLAGS: 00000282 [ 177.728846][ C0] RAX: b43ac49e0b0fb700 RBX: ffff888077368940 RCX: b43ac49e0b0fb700 [ 177.728859][ C0] RDX: dffffc0000000000 RSI: ffffffff8a0b1820 RDI: 0000000000000001 [ 177.728870][ C0] RBP: 0000000000000000 R08: dffffc0000000000 R09: ffffed100ee6d129 [ 177.728882][ C0] R10: ffffed100ee6d129 R11: 1ffff1100ee6d128 R12: ffff888077368940 [ 177.728898][ C0] R13: 0000000000000021 R14: dffffc0000000000 R15: 000000001c000004 [ 177.728918][ C0] get_signal+0x11d6/0x12c0 [ 177.728942][ C0] arch_do_signal_or_restart+0xc1/0x1300 [ 177.728962][ C0] ? _copy_from_user+0x111/0x170 [ 177.728979][ C0] ? __ia32_sys_rt_sigreturn+0x660/0x790 [ 177.729001][ C0] ? load_gs_index+0x120/0x120 [ 177.729020][ C0] ? get_sigframe_size+0x10/0x10 [ 177.729048][ C0] ? exit_to_user_mode_loop+0x3b/0x130 [ 177.729075][ C0] exit_to_user_mode_loop+0x9e/0x130 [ 177.729094][ C0] exit_to_user_mode_prepare+0xee/0x180 [ 177.729113][ C0] syscall_exit_to_user_mode+0x16/0x40 [ 177.729131][ C0] do_syscall_64+0x58/0xa0 [ 177.729145][ C0] ? clear_bhb_loop+0x30/0x80 [ 177.729160][ C0] ? clear_bhb_loop+0x30/0x80 [ 177.729176][ C0] entry_SYSCALL_64_after_hwframe+0x66/0xd0 [ 177.729192][ C0] RIP: 0033:0x7f9c5135a4c7 [ 177.729207][ C0] Code: 14 25 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 18 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 [ 177.729219][ C0] RSP: 002b:00007f9c5131a178 EFLAGS: 00000246 [ 177.729231][ C0] RAX: 00000000000000ca RBX: 00007f9c513e43c8 RCX: 00007f9c5135a4c9 [ 177.729242][ C0] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f9c513e43c8 [ 177.729253][ C0] RBP: 00007f9c513e43c0 R08: 00007f9c5131a6c0 R09: 00007f9c5131a6c0 [ 177.729264][ C0] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9c513e43cc [ 177.729275][ C0] R13: 0000000000000000 R14: 00007ffd3669d240 R15: 00007ffd3669d328 [ 177.729293][ C0]