[ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.235' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing 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executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 1258.778222][ T6523] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-... } 10507 jiffies s: 47213 root: 0x2/. [ 1258.791084][ T6523] rcu: blocking rcu_node structures (internal RCU debug): [ 1258.798277][ T6523] Task dump for CPU 1: [ 1258.802351][ T6523] task:ksoftirqd/1 state:R running task stack:25592 pid: 19 ppid: 2 flags:0x00004008 [ 1258.813323][ T6523] Call Trace: [ 1258.816619][ T6523] ? delayed_put_task_struct+0x1f6/0x340 [ 1258.822588][ T6523] ? rcu_core+0x7ab/0x1470 [ 1258.827070][ T6523] ? perf_trace_preemptirq_template+0x1b1/0x460 [ 1258.833579][ T6523] ? trace_rcu_stall_warning+0x1b0/0x1b0 [ 1258.839283][ T6523] ? __do_softirq+0x29b/0x9c2 [ 1258.844080][ T6523] ? __irq_exit_rcu+0x180/0x180 [ 1258.849099][ T6523] ? run_ksoftirqd+0x2d/0x60 [ 1258.853709][ T6523] ? smpboot_thread_fn+0x645/0x9c0 [ 1258.860715][ T6523] ? __smpboot_create_thread.part.0+0x370/0x370 [ 1258.866998][ T6523] ? kthread+0x3e5/0x4d0 [ 1258.871979][ T6523] ? set_kthread_struct+0x130/0x130 [ 1258.877205][ T6523] ? ret_from_fork+0x1f/0x30 [ 1263.827553][ C0] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: [ 1263.834558][ C0] rcu: 1-....: (0 ticks this GP) idle=819/1/0x4000000000000000 softirq=23812/23814 fqs=5249 [ 1263.845278][ C0] (detected by 0, t=10502 jiffies, g=45241, q=61) [ 1263.851836][ C0] Sending NMI from CPU 0 to CPUs 1: [ 1263.857042][ C1] NMI backtrace for cpu 1 [ 1263.857053][ C1] CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.15.0-rc6-syzkaller #0 [ 1263.857077][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1263.857090][ C1] RIP: 0010:lockdep_hardirqs_on_prepare+0xff/0x400 [ 1263.857200][ C1] Code: 00 0f 85 de 02 00 00 48 8d bb f8 09 00 00 48 8b ab 10 0a 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 bf 02 00 00 48 89 ab f8 09 00 00 48 c7 c7 a0 ff 8b 89 e8 98 [ 1263.857226][ C1] RSP: 0018:ffffc90000d97ba0 EFLAGS: 00000046 [ 1263.857244][ C1] RAX: dffffc0000000000 RBX: ffff888011f25580 RCX: 1ffffffff1adc989 [ 1263.857261][ C1] RDX: 1ffff110023e4bef RSI: 0000000000000000 RDI: ffff888011f25f78 [ 1263.857276][ C1] RBP: dd54574de8e51b8c R08: 0000000000000000 R09: 0000000000000001 [ 1263.857291][ C1] R10: ffffffff817d0842 R11: 0000000000000000 R12: 0000000000000001 [ 1263.857305][ C1] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 1263.857320][ C1] FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 1263.857342][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1263.857358][ C1] CR2: 0000000000000004 CR3: 000000001d0f6000 CR4: 00000000003506e0 [ 1263.857373][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1263.857386][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 1263.857401][ C1] Call Trace: [ 1263.857409][ C1] ? asm_sysvec_irq_work+0x12/0x20 [ 1263.857438][ C1] trace_hardirqs_on+0x5b/0x1c0 [ 1263.857467][ C1] asm_sysvec_irq_work+0x12/0x20 [ 1263.857494][ C1] RIP: 0010:__rcu_read_unlock+0xc4/0x570 [ 1263.857523][ C1] Code: b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e b6 01 00 00 8b 85 00 04 00 00 85 c0 75 54 <65> 48 8b 1c 25 40 f0 01 00 48 8d bb fc 03 00 00 48 b8 00 00 00 00 [ 1263.857544][ C1] RSP: 0018:ffffc90000d97c80 EFLAGS: 00000206 [ 1263.857562][ C1] RAX: 0000000000000006 RBX: ffff8880b9d328c0 RCX: 1ffffffff1adc989 [ 1263.857577][ C1] RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000000 [ 1263.857590][ C1] RBP: ffffffff8b98a880 R08: 0000000000000001 R09: 0000000000000001 [ 1263.857605][ C1] R10: ffffffff817d0842 R11: 0000000000000000 R12: 0000000000000001 [ 1263.857619][ C1] R13: ffff88807ba99c00 R14: 0000000000000200 R15: ffff88807ba9b150 [ 1263.857637][ C1] ? trace_hardirqs_on+0x182/0x1c0 [ 1263.857670][ C1] atomic_notifier_call_chain+0x95/0x180 [ 1263.857695][ C1] profile_handoff_task+0x1c/0x40 [ 1263.857721][ C1] __put_task_struct+0x250/0x400 [ 1263.857769][ C1] delayed_put_task_struct+0x1f6/0x340 [ 1263.857797][ C1] rcu_core+0x7ab/0x1470 [ 1263.857821][ C1] ? perf_trace_preemptirq_template+0x1b1/0x460 [ 1263.857854][ C1] ? trace_rcu_stall_warning+0x1b0/0x1b0 [ 1263.857888][ C1] __do_softirq+0x29b/0x9c2 [ 1263.857918][ C1] ? __irq_exit_rcu+0x180/0x180 [ 1263.857944][ C1] run_ksoftirqd+0x2d/0x60 [ 1263.857969][ C1] smpboot_thread_fn+0x645/0x9c0 [ 1263.857995][ C1] ? __smpboot_create_thread.part.0+0x370/0x370 [ 1263.858023][ C1] kthread+0x3e5/0x4d0 [ 1263.858048][ C1] ? set_kthread_struct+0x130/0x130 [ 1263.858076][ C1] ret_from_fork+0x1f/0x30