INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] 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 'ci-upstream-net-kasan-gce-8,10.128.0.46' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 executing program syzkaller login: [ 33.997572] ------------[ cut here ]------------ [ 34.002488] WARNING: CPU: 1 PID: 2982 at drivers/net/tun.c:1744 tun_get_user+0x2de3/0x36d0 [ 34.011098] Kernel panic - not syncing: panic_on_warn set ... [ 34.011098] [ 34.018439] CPU: 1 PID: 2982 Comm: syzkaller365748 Not tainted 4.14.0-rc4+ #80 [ 34.025766] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.035090] Call Trace: [ 34.037650] dump_stack+0x194/0x257 [ 34.041254] ? arch_local_irq_restore+0x53/0x53 [ 34.045904] panic+0x1e4/0x417 [ 34.049070] ? __warn+0x1d9/0x1d9 [ 34.052495] ? show_regs_print_info+0x65/0x65 [ 34.056975] ? tun_get_user+0x2de3/0x36d0 [ 34.061093] __warn+0x1c4/0x1d9 [ 34.064343] ? tun_get_user+0x2de3/0x36d0 [ 34.068464] report_bug+0x211/0x2d0 [ 34.072066] fixup_bug+0x40/0x90 [ 34.075404] do_trap+0x260/0x390 [ 34.078746] do_error_trap+0x120/0x390 [ 34.082606] ? kfree_skbmem+0xe2/0x1d0 [ 34.086471] ? do_trap+0x390/0x390 [ 34.089985] ? __mutex_unlock_slowpath+0xe9/0xac0 [ 34.094800] ? tun_get_user+0x2de3/0x36d0 [ 34.098920] ? wait_for_completion+0x7b0/0x7b0 [ 34.103481] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.108301] do_invalid_op+0x1b/0x20 [ 34.111985] invalid_op+0x18/0x20 [ 34.115409] RIP: 0010:tun_get_user+0x2de3/0x36d0 [ 34.120133] RSP: 0018:ffff8801ce6af730 EFLAGS: 00010286 [ 34.125469] RAX: dffffc0000000000 RBX: ffff8801ce23d698 RCX: dffffc0000000000 [ 34.132708] RDX: ffffffff87062d20 RSI: 0000000000000000 RDI: ffffed0039cd5ea8 [ 34.139946] RBP: ffff8801ce6afae0 R08: 0000000000000090 R09: 0000000000000000 [ 34.147188] R10: ffffffff870aaea0 R11: 0000000000000000 R12: ffff8801cde45300 [ 34.154427] R13: ffff8801ce23d708 R14: 0000000000000000 R15: ffff8801ce2e0dc0 [ 34.161710] ? tun_build_skb.isra.48+0x16e0/0x16e0 [ 34.166614] ? mmap_region+0x7ee/0x15a0 [ 34.170589] ? tun_chr_close+0x60/0x60 [ 34.174463] ? lock_release+0xd70/0xd70 [ 34.178410] ? __lock_is_held+0xbc/0x140 [ 34.182452] ? tun_get+0x1d4/0x2e0 [ 34.185963] ? tun_chr_close+0x60/0x60 [ 34.189819] ? __check_object_size+0x25d/0x4f0 [ 34.194379] tun_chr_write_iter+0xbf/0x160 [ 34.198586] do_iter_readv_writev+0x531/0x7f0 [ 34.203056] ? vfs_dedupe_file_range+0x900/0x900 [ 34.207795] ? rw_verify_area+0xe5/0x2b0 [ 34.211832] do_iter_write+0x15a/0x540 [ 34.215688] ? dup_iter+0x260/0x260 [ 34.219294] vfs_writev+0x18a/0x340 [ 34.222888] ? __fget_light+0x29d/0x390 [ 34.226834] ? vfs_iter_write+0xb0/0xb0 [ 34.230778] ? up_read+0x1a/0x40 [ 34.234117] ? __do_page_fault+0x3d6/0xd60 [ 34.238320] ? security_mmap_file+0x143/0x180 [ 34.242791] ? mm_fault_error+0x2c0/0x2c0 [ 34.246917] ? __fdget_pos+0x136/0x1a0 [ 34.250775] ? __fdget_raw+0x20/0x20 [ 34.254459] ? __do_page_fault+0xd60/0xd60 [ 34.258676] do_writev+0xfc/0x2a0 [ 34.262100] ? do_writev+0xfc/0x2a0 [ 34.265702] ? vfs_writev+0x340/0x340 [ 34.269475] ? entry_SYSCALL_64_fastpath+0x5/0xbe [ 34.274289] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 34.279281] SyS_writev+0x27/0x30 [ 34.282710] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 34.287434] RIP: 0033:0x444bb0 [ 34.290592] RSP: 002b:00007ffe306e3668 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 [ 34.298271] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000444bb0 [ 34.305512] RDX: 0000000000000002 RSI: 00007ffe306e3670 RDI: 0000000000000003 [ 34.312753] RBP: 0000000000000086 R08: 0000000000000066 R09: 0000000000000004 [ 34.319997] R10: 00000000bbbbbbbb R11: 0000000000000246 R12: 00000000004022c0 [ 34.327234] R13: 0000000000402350 R14: 0000000000000000 R15: 0000000000000000 [ 34.334939] Dumping ftrace buffer: [ 34.338517] (ftrace buffer empty) [ 34.342201] Kernel Offset: disabled [ 34.345804] Rebooting in 86400 seconds..