[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 77.576464][ T27] audit: type=1800 audit(1576731947.661:25): pid=9074 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 77.608861][ T27] audit: type=1800 audit(1576731947.661:26): pid=9074 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 77.661014][ T27] audit: type=1800 audit(1576731947.661:27): pid=9074 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] 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 '10.128.0.23' (ECDSA) to the list of known hosts. syzkaller login: [ 1032.624681][ T9238] IPVS: ftp: loaded support on port[0] = 21 [ 1032.637035][ T9241] IPVS: ftp: loaded support on port[0] = 21 [ 1032.638507][ T9242] IPVS: ftp: loaded support on port[0] = 21 [ 1032.643862][ T9239] IPVS: ftp: loaded support on port[0] = 21 [ 1032.651422][ T9240] IPVS: ftp: loaded support on port[0] = 21 [ 1032.675885][ T9243] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 1432.525618][T18543] ================================================================== [ 1432.525809][T18543] BUG: KASAN: global-out-of-bounds in bit_putcs+0xd5d/0xf10 [ 1432.525823][T18543] Read of size 1 at addr ffffffff8872bb44 by task syz-executor850/18543 [ 1432.525827][T18543] [ 1432.525844][T18543] CPU: 0 PID: 18543 Comm: syz-executor850 Not tainted 5.5.0-rc2-next-20191218-syzkaller #0 [ 1432.525853][T18543] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1432.525889][T18543] Call Trace: [ 1432.525951][T18543] dump_stack+0x197/0x210 [ 1432.525968][T18543] ? bit_putcs+0xd5d/0xf10 [ 1432.526032][T18543] print_address_description.constprop.0.cold+0x5/0x30b [ 1432.526046][T18543] ? bit_putcs+0xd5d/0xf10 [ 1432.526060][T18543] ? bit_putcs+0xd5d/0xf10 [ 1432.526076][T18543] __kasan_report.cold+0x1b/0x41 [ 1432.526115][T18543] ? fb_get_color_depth.part.0+0x60/0x200 [ 1432.526128][T18543] ? bit_putcs+0xd5d/0xf10 [ 1432.526145][T18543] kasan_report+0x12/0x20 [ 1432.526162][T18543] __asan_report_load1_noabort+0x14/0x20 [ 1432.526176][T18543] bit_putcs+0xd5d/0xf10 [ 1432.526212][T18543] ? bit_cursor+0x1a60/0x1a60 [ 1432.526274][T18543] ? write_comp_data+0x51/0x70 [ 1432.526292][T18543] ? fb_get_color_depth.part.0+0xcf/0x200 [ 1432.526313][T18543] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 1432.526333][T18543] fbcon_putcs+0x33c/0x3e0 [ 1432.526349][T18543] ? bit_cursor+0x1a60/0x1a60 [ 1432.526363][T18543] ? fb_flashcursor+0x3e0/0x3e0 [ 1432.526401][T18543] do_con_write.part.0+0xebd/0x1ef0 [ 1432.526435][T18543] ? do_con_trol+0x61b0/0x61b0 [ 1432.526476][T18543] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 1432.526511][T18543] ? add_wait_queue+0x112/0x170 [ 1432.526525][T18543] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 1432.526548][T18543] con_write+0x46/0xd0 [ 1432.526585][T18543] n_tty_write+0x40e/0x1080 [ 1432.526616][T18543] ? n_tty_read+0x1bf0/0x1bf0 [ 1432.526634][T18543] ? prepare_to_wait_exclusive+0x320/0x320 [ 1432.526664][T18543] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 1432.526719][T18543] ? _copy_from_user+0x12c/0x1a0 [ 1432.526739][T18543] tty_write+0x496/0x7f0 [ 1432.526760][T18543] ? n_tty_read+0x1bf0/0x1bf0 [ 1432.526803][T18543] __vfs_write+0x8a/0x110 [ 1432.526819][T18543] ? hung_up_tty_compat_ioctl+0x40/0x40 [ 1432.526838][T18543] vfs_write+0x268/0x5d0 [ 1432.526859][T18543] ksys_write+0x14f/0x290 [ 1432.526878][T18543] ? __ia32_sys_read+0xb0/0xb0 [ 1432.526920][T18543] ? do_syscall_64+0x26/0x790 [ 1432.526938][T18543] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1432.526954][T18543] ? do_syscall_64+0x26/0x790 [ 1432.526976][T18543] __x64_sys_write+0x73/0xb0 [ 1432.526995][T18543] do_syscall_64+0xfa/0x790 [ 1432.527016][T18543] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1432.527030][T18543] RIP: 0033:0x447d39 [ 1432.527048][T18543] Code: e8 1c e6 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 0f 83 8b 06 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 1432.527056][T18543] RSP: 002b:00007fe6827abce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 1432.527072][T18543] RAX: ffffffffffffffda RBX: 00000000006ddc68 RCX: 0000000000447d39 [ 1432.527081][T18543] RDX: 00000000fffffe4d RSI: 0000000020000340 RDI: 0000000000000003 [ 1432.527090][T18543] RBP: 00000000006ddc60 R08: 00007fe6827ac700 R09: 0000000000000000 [ 1432.527099][T18543] R10: 00007fe6827ac700 R11: 0000000000000246 R12: 00000000006ddc6c [ 1432.527108][T18543] R13: 00007ffd499e6fdf R14: 00007fe6827ac9c0 R15: 0000000000000001 [ 1432.527130][T18543] [ 1432.527135][T18543] The buggy address belongs to the variable: [ 1432.527172][T18543] __func__.44397+0x104/0x1c0 [ 1432.527176][T18543] [ 1432.527181][T18543] Memory state around the buggy address: [ 1432.527196][T18543] ffffffff8872ba00: 00 00 00 00 fa fa fa fa 00 03 fa fa fa fa fa fa [ 1432.527207][T18543] ffffffff8872ba80: 00 01 fa fa fa fa fa fa 04 fa fa fa fa fa fa fa [ 1432.527219][T18543] >ffffffff8872bb00: 04 fa fa fa fa fa fa fa 04 fa fa fa fa fa fa fa [ 1432.527226][T18543] ^ [ 1432.527238][T18543] ffffffff8872bb80: 04 fa fa fa fa fa fa fa 07 fa fa fa fa fa fa fa [ 1432.527250][T18543] ffffffff8872bc00: 04 fa fa fa fa fa fa fa 00 00 01 fa fa fa fa fa [ 1432.527255][T18543] ================================================================== [ 1432.527261][T18543] Disabling lock debugging due to kernel taint [ 1432.527269][T18543] Kernel panic - not syncing: panic_on_warn set ... [ 1432.527286][T18543] CPU: 0 PID: 18543 Comm: syz-executor850 Tainted: G B 5.5.0-rc2-next-20191218-syzkaller #0 [ 1432.527294][T18543] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1432.527298][T18543] Call Trace: [ 1432.527314][T18543] dump_stack+0x197/0x210 [ 1432.527366][T18543] panic+0x2e3/0x75c [ 1432.527381][T18543] ? add_taint.cold+0x16/0x16 [ 1432.527439][T18543] ? trace_hardirqs_on+0x67/0x240 [ 1432.527454][T18543] ? trace_hardirqs_on+0x5e/0x240 [ 1432.527471][T18543] ? bit_putcs+0xd5d/0xf10 [ 1432.527484][T18543] end_report+0x47/0x4f [ 1432.527496][T18543] ? bit_putcs+0xd5d/0xf10 [ 1432.527507][T18543] __kasan_report.cold+0xe/0x41 [ 1432.527521][T18543] ? fb_get_color_depth.part.0+0x60/0x200 [ 1432.527531][T18543] ? bit_putcs+0xd5d/0xf10 [ 1432.527544][T18543] kasan_report+0x12/0x20 [ 1432.527558][T18543] __asan_report_load1_noabort+0x14/0x20 [ 1432.527569][T18543] bit_putcs+0xd5d/0xf10 [ 1432.527593][T18543] ? bit_cursor+0x1a60/0x1a60 [ 1432.527608][T18543] ? write_comp_data+0x51/0x70 [ 1432.527622][T18543] ? fb_get_color_depth.part.0+0xcf/0x200 [ 1432.527638][T18543] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 1432.527660][T18543] fbcon_putcs+0x33c/0x3e0 [ 1432.527674][T18543] ? bit_cursor+0x1a60/0x1a60 [ 1432.527686][T18543] ? fb_flashcursor+0x3e0/0x3e0 [ 1432.527701][T18543] do_con_write.part.0+0xebd/0x1ef0 [ 1432.527722][T18543] ? do_con_trol+0x61b0/0x61b0 [ 1432.527737][T18543] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 1432.527748][T18543] ? add_wait_queue+0x112/0x170 [ 1432.527762][T18543] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 1432.527780][T18543] con_write+0x46/0xd0 [ 1432.527797][T18543] n_tty_write+0x40e/0x1080 [ 1432.527820][T18543] ? n_tty_read+0x1bf0/0x1bf0 [ 1432.527834][T18543] ? prepare_to_wait_exclusive+0x320/0x320 [ 1432.527852][T18543] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 1432.527867][T18543] ? _copy_from_user+0x12c/0x1a0 [ 1432.527882][T18543] tty_write+0x496/0x7f0 [ 1432.527899][T18543] ? n_tty_read+0x1bf0/0x1bf0 [ 1432.527914][T18543] __vfs_write+0x8a/0x110 [ 1432.527928][T18543] ? hung_up_tty_compat_ioctl+0x40/0x40 [ 1432.527943][T18543] vfs_write+0x268/0x5d0 [ 1432.527957][T18543] ksys_write+0x14f/0x290 [ 1432.527972][T18543] ? __ia32_sys_read+0xb0/0xb0 [ 1432.527988][T18543] ? do_syscall_64+0x26/0x790 [ 1432.528003][T18543] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1432.528017][T18543] ? do_syscall_64+0x26/0x790 [ 1432.528033][T18543] __x64_sys_write+0x73/0xb0 [ 1432.528048][T18543] do_syscall_64+0xfa/0x790 [ 1432.528066][T18543] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1432.528075][T18543] RIP: 0033:0x447d39 [ 1432.528089][T18543] Code: e8 1c e6 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 0f 83 8b 06 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 1432.528096][T18543] RSP: 002b:00007fe6827abce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 1432.528108][T18543] RAX: ffffffffffffffda RBX: 00000000006ddc68 RCX: 0000000000447d39 [ 1432.528115][T18543] RDX: 00000000fffffe4d RSI: 0000000020000340 RDI: 0000000000000003 [ 1432.528123][T18543] RBP: 00000000006ddc60 R08: 00007fe6827ac700 R09: 0000000000000000 [ 1432.528131][T18543] R10: 00007fe6827ac700 R11: 0000000000000246 R12: 00000000006ddc6c [ 1432.528139][T18543] R13: 00007ffd499e6fdf R14: 00007fe6827ac9c0 R15: 0000000000000001 [ 1432.529723][T18543] Kernel Offset: disabled [ 1433.286307][T18543] Rebooting in 86400 seconds..