Warning: Permanently added 'ci-android-49-kasan-gce-4,10.128.0.24' (ECDSA) to the list of known hosts. executing program serialport: Connected to syzkaller.us-central1-c.ci-android-49-kasan-gce-4 port 1 (session ID: 4f314e6b40515a0a598d6e0ae9cc5c6802bd15fed39502e74d042b5001ccde15, active connections: 1). executing program INIT: Entering runlevel: 2 [[36minfo[39;49m] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 31.639610] keychord: using input dev AT Translated Set 2 keyboard for fevent [ 31.648365] keychord: using input dev AT Translated Set 2 keyboard for fevent [ 31.717693] keychord: using input dev AT Translated Set 2 keyboard for fevent executing program [ 31.803081] keychord: using input dev AT Translated Set 2 keyboard for fevent [ 31.810568] keychord: using input dev AT Translated Set 2 keyboard for fevent [ 31.819219] keychord: using input dev AT Translated Set 2 keyboard for fevent executing program [ 31.888653] keychord: using input dev AT Translated Set 2 keyboard for fevent executing program [ 31.973063] keychord: using input dev AT Translated Set 2 keyboard for fevent [ 31.980426] keychord: using input dev AT Translated Set 2 keyboard for fevent [ 31.987787] ------------[ cut here ]------------ [ 31.992556] WARNING: CPU: 0 PID: 3358 at lib/list_debug.c:36 __list_add+0x169/0x1c0 [ 32.000405] list_add double add: new=ffff8801c6314968, prev=ffff8801c6314968, next=ffffffff84876140. [ 32.009707] Kernel panic - not syncing: panic_on_warn set ... [ 32.009707] [ 32.017038] CPU: 0 PID: 3358 Comm: syzkaller268134 Not tainted 4.9.39-ga1e4c795 #8 [ 32.024708] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.034026] ffff8801c95d79f8 ffffffff81eacd59 ffffffff83a48d40 ffff8801c95d7ad0 [ 32.041972] ffffffff83c3a600 ffffffff81f13829 0000000000000009 ffff8801c95d7ac0 [ 32.049919] ffffffff814265a6 0000000041b58ab3 ffffffff84169b8d ffffffff814263f2 [ 32.057857] Call Trace: [ 32.060413] [] dump_stack+0xc1/0x128 [ 32.065741] [] ? __list_add+0x169/0x1c0 [ 32.071328] [] panic+0x1b4/0x3a0 [ 32.076313] [] ? percpu_up_read_preempt_enable.constprop.42+0xd7/0xd7 [ 32.084504] [] ? vprintk_emit+0x3ad/0x750 [ 32.090266] [] ? __list_add+0x169/0x1c0 [ 32.095855] [] __warn+0x1c4/0x1e0 [ 32.100922] [] warn_slowpath_fmt+0xae/0xe0 [ 32.106768] [] ? __warn+0x1e0/0x1e0 [ 32.112009] [] ? mutex_lock_nested+0x830/0x830 [ 32.118294] [] __list_add+0x169/0x1c0 [ 32.123715] [] input_register_handler+0xa0/0x150 [ 32.130087] [] keychord_write+0x575/0x810 [ 32.135849] [] ? keychord_read+0x4f0/0x4f0 [ 32.141699] [] __vfs_write+0xfb/0x660 [ 32.147113] [] ? do_huge_pmd_anonymous_page+0x2ed/0xfd0 [ 32.154103] [] ? default_llseek+0x290/0x290 [ 32.160046] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 32.166764] [] ? common_file_perm+0x14f/0x390 [ 32.172870] [] ? apparmor_file_permission+0x22/0x30 [ 32.179510] [] ? security_file_permission+0x89/0x1e0 [ 32.186229] [] ? rw_verify_area+0xe5/0x2b0 [ 32.192076] [] vfs_write+0x170/0x4e0 [ 32.197403] [] SyS_write+0xd4/0x1a0 [ 32.202644] [] ? SyS_read+0x1a0/0x1a0 [ 32.208062] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 32.214873] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 32.221417] [] entry_SYSCALL_64_fastpath+0x23/0xc6 [ 32.228461] Dumping ftrace buffer: [ 32.232004] (ftrace buffer empty) [ 32.235680] Kernel Offset: disabled [ 32.239289] Rebooting in 86400 seconds..