[ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 15.547343][ C0] random: crng init done [ 15.551643][ C0] random: 7 urandom warning(s) missed due to ratelimiting Warning: Permanently added '10.128.0.78' (ECDSA) to the list of known hosts. 2020/04/21 05:06:11 parsed 1 programs 2020/04/21 05:06:12 executed programs: 0 [ 1020.814899][ T398] cgroup: Unknown subsys name 'perf_event' [ 1020.821399][ T398] cgroup: Unknown subsys name 'net_cls' [ 1022.809805][ T361] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 1022.899478][ T361] usb 1-1: Using ep0 maxpacket: 8 [ 1023.019331][ T361] usb 1-1: config 118 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 [ 1023.030722][ T361] usb 1-1: New USB device found, idVendor=0400, idProduct=4200, bcdDevice=42.ef [ 1023.040003][ T361] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 1023.091913][ T361] hub 1-1:118.0: bad descriptor, ignoring hub [ 1023.098921][ T361] hub: probe of 1-1:118.0 failed with error -5 [ 1023.110238][ T361] cdc_wdm 1-1:118.0: cdc-wdm0: USB WDM device [ 1024.050381][ T362] usb 1-1: USB disconnect, device number 2 [ 1024.079223][ T846] cdc_wdm 1-1:118.0: Error in flush path: -71 [ 1024.848971][ T362] usb 1-1: new high-speed USB device number 3 using dummy_hcd [ 1024.939021][ T362] usb 1-1: Using ep0 maxpacket: 8 [ 1025.059017][ T362] usb 1-1: config 118 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 [ 1025.070219][ T362] usb 1-1: New USB device found, idVendor=0400, idProduct=4200, bcdDevice=42.ef [ 1025.079732][ T362] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 1025.129485][ T362] hub 1-1:118.0: bad descriptor, ignoring hub [ 1025.135811][ T362] hub: probe of 1-1:118.0 failed with error -5 [ 1025.143912][ T362] cdc_wdm 1-1:118.0: cdc-wdm0: USB WDM device [ 1025.849611][ T95] usb 1-1: reset high-speed USB device number 3 using dummy_hcd [ 1025.938927][ T95] usb 1-1: Using ep0 maxpacket: 8 [ 1027.020334][ T17] usb 1-1: USB disconnect, device number 3 [ 1027.038767][ T867] cdc_wdm 1-1:118.0: Error in flush path: -71 [ 1027.818646][ T95] usb 1-1: new high-speed USB device number 4 using dummy_hcd [ 1027.908702][ T95] usb 1-1: Using ep0 maxpacket: 8 [ 1028.028694][ T95] usb 1-1: config 118 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 [ 1028.040271][ T95] usb 1-1: New USB device found, idVendor=0400, idProduct=4200, bcdDevice=42.ef [ 1028.049643][ T95] usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 1028.099105][ T95] hub 1-1:118.0: bad descriptor, ignoring hub [ 1028.105296][ T95] hub: probe of 1-1:118.0 failed with error -5 [ 1028.113902][ T95] cdc_wdm 1-1:118.0: cdc-wdm0: USB WDM device 2020/04/21 05:07:17 executed programs: 2 2020/04/21 05:07:17 result: hanged=false err=executor 0: failed to write control pipe: write |1: broken pipe [ 1085.678826][ T882] cgroup: Unknown subsys name 'perf_event' [ 1085.685466][ T882] cgroup: Unknown subsys name 'net_cls' [ 1087.501432][ T1331] udc-core: couldn't find an available UDC or it's busy [ 1087.509375][ T1331] misc raw-gadget: fail, usb_gadget_probe_driver returned -16 2020/04/21 05:08:19 executed programs: 4 2020/04/21 05:08:19 result: hanged=false err=executor 0: failed to write control pipe: write |1: broken pipe [ 1147.501801][ T1336] cgroup: Unknown subsys name 'perf_event' [ 1147.508139][ T1336] cgroup: Unknown subsys name 'net_cls' [ 1149.279993][ T1784] udc-core: couldn't find an available UDC or it's busy [ 1149.287159][ T1784] misc raw-gadget: fail, usb_gadget_probe_driver returned -16 [ 1189.863488][ T23] INFO: task syz-executor.0:868 blocked for more than 143 seconds. [ 1189.873334][ T23] Not tainted 5.6.0-rc7-syzkaller #0 [ 1189.879673][ T23] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1189.889625][ T23] syz-executor.0 D25984 868 398 0x80004006 [ 1189.896868][ T23] Call Trace: [ 1189.900442][ T23] ? __schedule+0x892/0x1d80 [ 1189.905328][ T23] ? __sched_text_start+0x8/0x8 [ 1189.910249][ T23] ? prepare_to_wait_event+0x129/0x650 [ 1189.915953][ T23] ? _raw_spin_unlock_irqrestore+0x39/0x40 [ 1189.922068][ T23] schedule+0xcd/0x2b0 [ 1189.926331][ T23] wdm_flush+0x2ea/0x3c0 [ 1189.931228][ T23] ? wdm_poll+0x280/0x280 [ 1189.936640][ T23] ? __kasan_slab_free+0x12e/0x160 [ 1189.942304][ T23] ? finish_wait+0x260/0x260 [ 1189.948068][ T23] ? task_work_add+0x97/0x120 [ 1189.953031][ T23] ? wdm_poll+0x280/0x280 [ 1189.957842][ T23] filp_close+0xb4/0x160 [ 1189.963199][ T23] put_files_struct+0x1d8/0x2e0 [ 1189.969363][ T23] exit_files+0x7e/0xa0 [ 1189.974165][ T23] do_exit+0xb36/0x2c80 [ 1189.978760][ T23] ? find_held_lock+0x2d/0x110 [ 1189.984580][ T23] ? mm_update_next_owner+0x7a0/0x7a0 [ 1189.992168][ T23] ? lock_downgrade+0x6e0/0x6e0 [ 1189.997441][ T23] do_group_exit+0x125/0x340 [ 1190.002879][ T23] get_signal+0x480/0x2470 [ 1190.008212][ T23] ? wdm_write+0x1c2/0xe24 [ 1190.012640][ T23] do_signal+0x88/0x1490 [ 1190.016942][ T23] ? __fget_files+0x32d/0x500 [ 1190.021729][ T23] ? setup_sigcontext+0x820/0x820 [ 1190.027115][ T23] ? wdm_probe+0x2d0/0x2d0 [ 1190.031559][ T23] ? __vfs_write+0x7e/0x100 [ 1190.036242][ T23] ? vfs_write+0x15b/0x5c0 [ 1190.040844][ T23] ? fput_many+0x2f/0x1a0 [ 1190.045353][ T23] ? ksys_write+0x19f/0x250 [ 1190.049996][ T23] ? __ia32_sys_read+0xb0/0xb0 [ 1190.055801][ T23] exit_to_usermode_loop+0x1a2/0x200 [ 1190.061119][ T23] do_syscall_64+0x4e0/0x5a0 [ 1190.065906][ T23] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1190.072247][ T23] RIP: 0033:0x45c829 [ 1190.077834][ T23] Code: 48 89 5c 24 08 48 c7 44 24 10 00 00 00 00 e8 5e a4 fa ff 8b 05 18 b8 70 01 48 8b 4c 24 18 85 c0 0f 85 19 01 00 00 48 8b 84 24 00 00 00 48 89 48 18 48 8d 7c 24 68 0f 57 c0 48 8d 7f e0 48 89 [ 1190.100027][ T23] RSP: 002b:00007f28a9019c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 1190.109067][ T23] RAX: 0000000000000000 RBX: 000000000050c480 RCX: 000000000045c829 [ 1190.117116][ T23] RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000004 [ 1190.125171][ T23] RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 [ 1190.133145][ T23] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff [ 1190.141220][ T23] R13: 0000000000000ce7 R14: 00000000004cf129 R15: 00007f28a901a6d4 [ 1190.149330][ T23] [ 1190.149330][ T23] Showing all locks held in the system: [ 1190.157208][ T23] 1 lock held by khungtaskd/23: [ 1190.162069][ T23] #0: ffffffff87108b60 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x264 [ 1190.171624][ T23] 2 locks held by in:imklog/267: [ 1190.176731][ T23] #0: ffff8881ca8e8fe0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 [ 1190.185728][ T23] #1: ffffffff871958e0 (fs_reclaim){+.+.}, at: do_syslog+0x791/0x1380 [ 1190.194068][ T23] [ 1190.196393][ T23] ============================================= [ 1190.196393][ T23] [ 1190.204864][ T23] NMI backtrace for cpu 1 [ 1190.209320][ T23] CPU: 1 PID: 23 Comm: khungtaskd Not tainted 5.6.0-rc7-syzkaller #0 [ 1190.217890][ T23] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1190.229327][ T23] Call Trace: [ 1190.232722][ T23] dump_stack+0xef/0x16e [ 1190.236984][ T23] ? lapic_can_unplug_cpu.cold+0xc/0x3b [ 1190.242549][ T23] nmi_cpu_backtrace.cold+0x70/0xb1 [ 1190.247838][ T23] ? lapic_can_unplug_cpu.cold+0x3b/0x3b [ 1190.253464][ T23] nmi_trigger_cpumask_backtrace+0x1db/0x207 [ 1190.259531][ T23] watchdog+0xa99/0xfd0 [ 1190.263864][ T23] ? reset_hung_task_detector+0x30/0x30 [ 1190.269657][ T23] kthread+0x318/0x420 [ 1190.274425][ T23] ? kthread_create_on_node+0xf0/0xf0 [ 1190.279795][ T23] ret_from_fork+0x24/0x30 [ 1190.284288][ T23] Sending NMI from CPU 1 to CPUs 0: [ 1190.289788][ C0] NMI backtrace for cpu 0 skipped: idling at default_idle+0x28/0x300 [ 1190.290726][ T23] Kernel panic - not syncing: hung_task: blocked tasks [ 1190.306265][ T23] CPU: 1 PID: 23 Comm: khungtaskd Not tainted 5.6.0-rc7-syzkaller #0 [ 1190.318554][ T23] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1190.328813][ T23] Call Trace: [ 1190.332158][ T23] dump_stack+0xef/0x16e [ 1190.336484][ T23] panic+0x2aa/0x6e1 [ 1190.340922][ T23] ? add_taint.cold+0x16/0x16 [ 1190.345598][ T23] ? cpumask_next+0x3c/0x40 [ 1190.350088][ T23] ? printk_safe_flush+0xd9/0x120 [ 1190.355093][ T23] ? watchdog+0xa99/0xfd0 [ 1190.359403][ T23] ? nmi_trigger_cpumask_backtrace+0x1b3/0x207 [ 1190.365603][ T23] watchdog+0xaaa/0xfd0 [ 1190.369919][ T23] ? reset_hung_task_detector+0x30/0x30 [ 1190.376335][ T23] kthread+0x318/0x420 [ 1190.380846][ T23] ? kthread_create_on_node+0xf0/0xf0 [ 1190.386615][ T23] ret_from_fork+0x24/0x30 [ 1190.392874][ T23] Kernel Offset: disabled [ 1190.397257][ T23] Rebooting in 86400 seconds..