[info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 15.597524][ C1] random: crng init done [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.4' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 23.744836][ T95] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 23.984806][ T95] usb 1-1: Using ep0 maxpacket: 32 [ 24.104924][ T95] usb 1-1: config 0 has an invalid descriptor of length 0, skipping remainder of the config [ 24.274910][ T95] usb 1-1: New USB device found, idVendor=18cd, idProduct=cafe, bcdDevice=99.e3 [ 24.284023][ T95] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 24.292220][ T95] usb 1-1: Product: syz [ 24.296438][ T95] usb 1-1: Manufacturer: syz [ 24.301019][ T95] usb 1-1: SerialNumber: syz [ 24.307040][ T95] usb 1-1: config 0 descriptor?? [ 24.346376][ T95] uvcvideo: Found UVC 0.00 device syz (18cd:cafe) [ 24.352885][ T95] ------------[ cut here ]------------ [ 24.358429][ T95] list_add double add: new=ffff8881cfef1010, prev=ffff8881cfef1010, next=ffff8881d4fd5c18. [ 24.368727][ T95] WARNING: CPU: 0 PID: 95 at lib/list_debug.c:29 __list_add_valid+0xb4/0xf0 [ 24.377745][ T95] Kernel panic - not syncing: panic_on_warn set ... [ 24.384316][ T95] CPU: 0 PID: 95 Comm: kworker/0:2 Not tainted 5.5.0-rc3-syzkaller #0 [ 24.392454][ T95] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.402504][ T95] Workqueue: usb_hub_wq hub_event [ 24.407542][ T95] Call Trace: [ 24.410821][ T95] dump_stack+0xef/0x16e [ 24.415079][ T95] ? __list_add_valid+0x20/0xf0 [ 24.419927][ T95] panic+0x2aa/0x6e1 [ 24.423807][ T95] ? add_taint.cold+0x16/0x16 [ 24.428465][ T95] ? __probe_kernel_read+0x188/0x1d0 [ 24.433742][ T95] ? __warn.cold+0x14/0x30 [ 24.438140][ T95] ? __warn+0xd5/0x1c8 [ 24.442253][ T95] ? __list_add_valid+0xb4/0xf0 [ 24.447094][ T95] __warn.cold+0x2f/0x30 [ 24.451326][ T95] ? __list_add_valid+0xb4/0xf0 [ 24.456226][ T95] report_bug+0x27b/0x2f0 [ 24.460566][ T95] do_error_trap+0x12b/0x1e0 [ 24.465139][ T95] ? __list_add_valid+0xb4/0xf0 [ 24.470030][ T95] do_invalid_op+0x32/0x40 [ 24.474444][ T95] ? __list_add_valid+0xb4/0xf0 [ 24.479327][ T95] invalid_op+0x23/0x30 [ 24.483778][ T95] RIP: 0010:__list_add_valid+0xb4/0xf0 [ 24.489231][ T95] Code: 48 c7 c7 20 ef da 85 4c 89 e6 e8 2f b5 2b ff 0f 0b 31 c0 eb c5 48 89 f2 4c 89 e1 48 89 ee 48 c7 c7 a0 ef da 85 e8 14 b5 2b ff <0f> 0b 31 c0 eb aa 48 89 34 24 e8 ed 1f 7f ff 48 8b 34 24 e9 60 ff [ 24.509062][ T95] RSP: 0018:ffff8881d6177080 EFLAGS: 00010286 [ 24.515135][ T95] RAX: 0000000000000000 RBX: ffff8881cfef1010 RCX: 0000000000000000 [ 24.523100][ T95] RDX: 0000000000000000 RSI: ffffffff812956dd RDI: ffffed103ac2ee02 [ 24.531064][ T95] RBP: ffff8881cfef1010 R08: ffff8881d755c980 R09: ffffed103b686210 [ 24.539546][ T95] R10: ffffed103b68620f R11: ffff8881db43107f R12: ffff8881d4fd5c18 [ 24.547503][ T95] R13: ffff8881cfef1000 R14: dffffc0000000000 R15: ffff8881d4fd5c18 [ 24.555472][ T95] ? vprintk_func+0x7d/0x113 [ 24.560053][ T95] uvc_scan_chain_forward.isra.0+0x4df/0x637 [ 24.566018][ T95] uvc_probe.cold+0x1aee/0x29de [ 24.570939][ T95] ? mark_lock+0xbc/0x1160 [ 24.575419][ T95] ? mark_lock+0xbc/0x1160 [ 24.579811][ T95] ? mark_held_locks+0x9f/0xe0 [ 24.584581][ T95] ? usb_probe_interface+0x305/0x7a0 [ 24.589853][ T95] usb_probe_interface+0x305/0x7a0 [ 24.594940][ T95] ? usb_probe_device+0x100/0x100 [ 24.599943][ T95] really_probe+0x281/0x6d0 [ 24.604424][ T95] driver_probe_device+0x104/0x210 [ 24.609523][ T95] __device_attach_driver+0x1c2/0x220 [ 24.614870][ T95] ? driver_allows_async_probing+0x160/0x160 [ 24.620832][ T95] bus_for_each_drv+0x162/0x1e0 [ 24.625659][ T95] ? bus_rescan_devices+0x20/0x20 [ 24.630680][ T95] ? _raw_spin_unlock_irqrestore+0x39/0x40 [ 24.636480][ T95] ? lockdep_hardirqs_on+0x382/0x580 [ 24.641749][ T95] __device_attach+0x217/0x360 [ 24.646680][ T95] ? device_bind_driver+0xd0/0xd0 [ 24.651869][ T95] bus_probe_device+0x1e4/0x290 [ 24.656719][ T95] device_add+0x141f/0x1bc0 [ 24.661221][ T95] ? wait_for_completion+0x3c0/0x3c0 [ 24.666549][ T95] ? device_links_flush_sync_list+0x350/0x350 [ 24.672640][ T95] ? _raw_spin_unlock_irqrestore+0x39/0x40 [ 24.678431][ T95] usb_set_configuration+0xe38/0x16c0 [ 24.683784][ T95] generic_probe+0x9d/0xd5 [ 24.688180][ T95] usb_probe_device+0x99/0x100 [ 24.692935][ T95] ? usb_suspend+0x620/0x620 [ 24.697500][ T95] really_probe+0x281/0x6d0 [ 24.701982][ T95] driver_probe_device+0x104/0x210 [ 24.707066][ T95] __device_attach_driver+0x1c2/0x220 [ 24.712427][ T95] ? driver_allows_async_probing+0x160/0x160 [ 24.718421][ T95] bus_for_each_drv+0x162/0x1e0 [ 24.723248][ T95] ? bus_rescan_devices+0x20/0x20 [ 24.728257][ T95] ? _raw_spin_unlock_irqrestore+0x39/0x40 [ 24.734042][ T95] ? lockdep_hardirqs_on+0x382/0x580 [ 24.739312][ T95] __device_attach+0x217/0x360 [ 24.744060][ T95] ? device_bind_driver+0xd0/0xd0 [ 24.749066][ T95] bus_probe_device+0x1e4/0x290 [ 24.753893][ T95] device_add+0x141f/0x1bc0 [ 24.758388][ T95] ? device_links_flush_sync_list+0x350/0x350 [ 24.764432][ T95] usb_new_device.cold+0x6a4/0xe79 [ 24.769521][ T95] hub_event+0x1e59/0x3860 [ 24.773914][ T95] ? hub_port_debounce+0x260/0x260 [ 24.779087][ T95] ? find_held_lock+0x2d/0x110 [ 24.783853][ T95] ? mark_held_locks+0xe0/0xe0 [ 24.788639][ T95] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 24.794195][ T95] ? rcu_read_lock_bh_held+0xb0/0xb0 [ 24.799486][ T95] process_one_work+0x92b/0x1530 [ 24.804413][ T95] ? pwq_dec_nr_in_flight+0x310/0x310 [ 24.809770][ T95] ? do_raw_spin_lock+0x129/0x290 [ 24.814833][ T95] worker_thread+0x96/0xe20 [ 24.819407][ T95] ? process_one_work+0x1530/0x1530 [ 24.824599][ T95] kthread+0x318/0x420 [ 24.828660][ T95] ? kthread_create_on_node+0xf0/0xf0 [ 24.834022][ T95] ret_from_fork+0x24/0x30 [ 24.839373][ T95] Kernel Offset: disabled [ 24.843838][ T95] Rebooting in 86400 seconds..