[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 35.751770] random: sshd: uninitialized urandom read (32 bytes read) [ 36.103949] kauditd_printk_skb: 10 callbacks suppressed [ 36.103958] audit: type=1400 audit(1575495854.868:35): avc: denied { map } for pid=7039 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 [ 36.197472] random: sshd: uninitialized urandom read (32 bytes read) [ 36.793438] random: sshd: uninitialized urandom read (32 bytes read) [ 490.028461] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.53' (ECDSA) to the list of known hosts. [ 495.607413] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 495.723631] audit: type=1400 audit(1575496314.488:36): avc: denied { map } for pid=7051 comm="syz-executor453" path="/root/syz-executor453173428" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 508.964780] ================================================================== [ 508.972830] BUG: KASAN: use-after-free in n_tty_receive_buf_common+0x1feb/0x2410 [ 508.972842] Read of size 1 at addr ffff88809feda3c0 by task syz-executor453/9268 [ 508.972845] [ 508.972854] CPU: 0 PID: 9268 Comm: syz-executor453 Not tainted 4.14.157-syzkaller #0 [ 508.972859] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 508.972888] Call Trace: [ 508.972928] dump_stack+0x142/0x197 [ 509.013267] ? n_tty_receive_buf_common+0x1feb/0x2410 [ 509.013399] print_address_description.cold+0x7c/0x1dc [ 509.023797] ? n_tty_receive_buf_common+0x1feb/0x2410 [ 509.023807] kasan_report.cold+0xa9/0x2af [ 509.023816] __asan_report_load1_noabort+0x14/0x20 [ 509.023822] n_tty_receive_buf_common+0x1feb/0x2410 [ 509.023845] n_tty_receive_buf2+0x34/0x40 [ 509.023854] ? n_tty_receive_buf_common+0x2410/0x2410 [ 509.023860] tty_ldisc_receive_buf+0xa5/0x1a0 [ 509.023941] paste_selection+0x1e6/0x3f2 [ 509.023981] ? find_held_lock+0x35/0x130 [ 509.023992] ? set_selection+0xe30/0xe30 [ 509.024001] ? lock_downgrade+0x740/0x740 [ 509.024067] ? wake_up_q+0xf0/0xf0 [ 509.077384] tioclinux+0x10e/0x400 [ 509.077396] vt_ioctl+0x180c/0x2170 [ 509.084692] ? avc_has_extended_perms+0x8ec/0xe40 [ 509.084705] ? complete_change_console+0x360/0x360 [ 509.084713] ? avc_ss_reset+0x110/0x110 [ 509.084782] ? do_raw_spin_unlock+0x16b/0x260 [ 509.084792] ? tty_jobctrl_ioctl+0x44/0xc10 [ 509.107410] ? _raw_spin_unlock+0x2d/0x50 [ 509.107420] ? complete_change_console+0x360/0x360 [ 509.107432] tty_ioctl+0x841/0x1320 [ 509.107443] ? tty_vhangup+0x30/0x30 [ 509.124265] ? __might_sleep+0x93/0xb0 [ 509.124274] ? save_trace+0x290/0x290 [ 509.124290] ? tty_vhangup+0x30/0x30 [ 509.124378] do_vfs_ioctl+0x7ae/0x1060 [ 509.124421] ? selinux_file_mprotect+0x5d0/0x5d0 [ 509.124431] ? ioctl_preallocate+0x1c0/0x1c0 [ 509.124439] ? lock_downgrade+0x740/0x740 [ 509.124473] ? security_file_ioctl+0x7d/0xb0 [ 509.124482] ? security_file_ioctl+0x89/0xb0 [ 509.161833] SyS_ioctl+0x8f/0xc0 [ 509.161843] ? do_vfs_ioctl+0x1060/0x1060 [ 509.161853] do_syscall_64+0x1e8/0x640 [ 509.161860] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 509.161874] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 509.161882] RIP: 0033:0x4417b9 [ 509.161886] RSP: 002b:00007ffeb350ec98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 509.161895] RAX: ffffffffffffffda RBX: 000000000007c3e5 RCX: 00000000004417b9 [ 509.161900] RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000003 [ 509.161904] RBP: 0000000000000000 R08: 000000000000000d R09: 0000000000000000 [ 509.161908] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000016f [ 509.161912] R13: 0000000000402490 R14: 0000000000000000 R15: 0000000000000000 [ 509.161925] [ 509.162032] Allocated by task 9266: [ 509.162043] save_stack_trace+0x16/0x20 [ 509.239762] save_stack+0x45/0xd0 [ 509.239768] kasan_kmalloc+0xce/0xf0 [ 509.239773] __kmalloc+0x15d/0x7a0 [ 509.239780] set_selection+0x79a/0xe30 [ 509.239784] tioclinux+0xf7/0x400 [ 509.239788] vt_ioctl+0x180c/0x2170 [ 509.239794] tty_ioctl+0x841/0x1320 [ 509.239801] do_vfs_ioctl+0x7ae/0x1060 [ 509.239807] SyS_ioctl+0x8f/0xc0 [ 509.239815] do_syscall_64+0x1e8/0x640 [ 509.239824] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 509.239827] [ 509.239831] Freed by task 9267: [ 509.239839] save_stack_trace+0x16/0x20 [ 509.239844] save_stack+0x45/0xd0 [ 509.239850] kasan_slab_free+0x75/0xc0 [ 509.239854] kfree+0xcc/0x270 [ 509.239860] set_selection+0x7b7/0xe30 [ 509.239864] tioclinux+0xf7/0x400 [ 509.239869] vt_ioctl+0x180c/0x2170 [ 509.239874] tty_ioctl+0x841/0x1320 [ 509.239880] do_vfs_ioctl+0x7ae/0x1060 [ 509.239886] SyS_ioctl+0x8f/0xc0 [ 509.239891] do_syscall_64+0x1e8/0x640 [ 509.239898] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 509.331638] [ 509.331648] The buggy address belongs to the object at ffff88809feda3c0 [ 509.331648] which belongs to the cache kmalloc-32 of size 32 [ 509.331653] The buggy address is located 0 bytes inside of [ 509.331653] 32-byte region [ffff88809feda3c0, ffff88809feda3e0) [ 509.331656] The buggy address belongs to the page: [ 509.331662] page:ffffea00027fb680 count:1 mapcount:0 mapping:ffff88809feda000 index:0xffff88809fedafc1 [ 509.331669] flags: 0xfffe0000000100(slab) [ 509.331678] raw: 00fffe0000000100 ffff88809feda000 ffff88809fedafc1 000000010000003f [ 509.331685] raw: ffffea00027e0160 ffffea00027fce20 ffff8880aa8001c0 0000000000000000 [ 509.331688] page dumped because: kasan: bad access detected [ 509.331690] [ 509.331692] Memory state around the buggy address: [ 509.331697] ffff88809feda280: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 509.331702] ffff88809feda300: 00 00 01 fc fc fc fc fc fb fb fb fb fc fc fc fc [ 509.331706] >ffff88809feda380: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 509.331710] ^ [ 509.331714] ffff88809feda400: 00 00 01 fc fc fc fc fc fb fb fb fb fc fc fc fc [ 509.331719] ffff88809feda480: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 509.331722] ================================================================== [ 509.331725] Disabling lock debugging due to kernel taint [ 509.332441] Kernel panic - not syncing: panic_on_warn set ... [ 509.332441] [ 509.332451] CPU: 0 PID: 9268 Comm: syz-executor453 Tainted: G B 4.14.157-syzkaller #0 [ 509.332455] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 509.332458] Call Trace: [ 509.332472] dump_stack+0x142/0x197 [ 509.332484] ? n_tty_receive_buf_common+0x1feb/0x2410 [ 509.332564] panic+0x1f9/0x42d [ 509.332571] ? add_taint.cold+0x16/0x16 [ 509.332581] ? ___preempt_schedule+0x16/0x18 [ 509.332594] kasan_end_report+0x47/0x4f [ 509.332601] kasan_report.cold+0x130/0x2af [ 509.332609] __asan_report_load1_noabort+0x14/0x20 [ 509.332617] n_tty_receive_buf_common+0x1feb/0x2410 [ 509.332633] n_tty_receive_buf2+0x34/0x40 [ 509.332641] ? n_tty_receive_buf_common+0x2410/0x2410 [ 509.332647] tty_ldisc_receive_buf+0xa5/0x1a0 [ 509.332656] paste_selection+0x1e6/0x3f2 [ 509.332664] ? find_held_lock+0x35/0x130 [ 509.332672] ? set_selection+0xe30/0xe30 [ 509.332681] ? lock_downgrade+0x740/0x740 [ 509.332688] ? wake_up_q+0xf0/0xf0 [ 509.332698] tioclinux+0x10e/0x400 [ 509.332706] vt_ioctl+0x180c/0x2170 [ 509.332713] ? avc_has_extended_perms+0x8ec/0xe40 [ 509.332721] ? complete_change_console+0x360/0x360 [ 509.332728] ? avc_ss_reset+0x110/0x110 [ 509.332737] ? do_raw_spin_unlock+0x16b/0x260 [ 509.332745] ? tty_jobctrl_ioctl+0x44/0xc10 [ 509.332753] ? _raw_spin_unlock+0x2d/0x50 [ 509.332759] ? complete_change_console+0x360/0x360 [ 509.332766] tty_ioctl+0x841/0x1320 [ 509.332774] ? tty_vhangup+0x30/0x30 [ 509.332784] ? __might_sleep+0x93/0xb0 [ 509.332790] ? save_trace+0x290/0x290 [ 509.332800] ? tty_vhangup+0x30/0x30 [ 509.332809] do_vfs_ioctl+0x7ae/0x1060 [ 509.332818] ? selinux_file_mprotect+0x5d0/0x5d0 [ 509.332825] ? ioctl_preallocate+0x1c0/0x1c0 [ 509.332832] ? lock_downgrade+0x740/0x740 [ 509.332844] ? security_file_ioctl+0x7d/0xb0 [ 509.332850] ? security_file_ioctl+0x89/0xb0 [ 509.332858] SyS_ioctl+0x8f/0xc0 [ 509.332865] ? do_vfs_ioctl+0x1060/0x1060 [ 509.332872] do_syscall_64+0x1e8/0x640 [ 509.332879] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 509.332888] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 509.332894] RIP: 0033:0x4417b9 [ 509.332898] RSP: 002b:00007ffeb350ec98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 509.332906] RAX: ffffffffffffffda RBX: 000000000007c3e5 RCX: 00000000004417b9 [ 509.332911] RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000003 [ 509.332920] RBP: 0000000000000000 R08: 000000000000000d R09: 0000000000000000 [ 509.332924] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000016f [ 509.332928] R13: 0000000000402490 R14: 0000000000000000 R15: 0000000000000000 [ 509.334477] Kernel Offset: disabled [ 509.720757] Rebooting in 86400 seconds..