[....] 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. [ 67.799423][ T24] kauditd_printk_skb: 7 callbacks suppressed [ 67.799434][ T24] audit: type=1800 audit(1565523508.086:29): pid=9725 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 67.827735][ T24] audit: type=1800 audit(1565523508.096:30): pid=9725 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.60' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 76.572813][ T9879] ================================================================== [ 76.581240][ T9879] BUG: KASAN: null-ptr-deref in rxrpc_unuse_local+0x23/0x70 [ 76.588496][ T9879] Write of size 4 at addr 0000000000000010 by task syz-executor659/9879 [ 76.596788][ T9879] [ 76.599098][ T9879] CPU: 1 PID: 9879 Comm: syz-executor659 Not tainted 5.3.0-rc3-next-20190809 #63 [ 76.608175][ T9879] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.618210][ T9879] Call Trace: [ 76.621489][ T9879] dump_stack+0x172/0x1f0 [ 76.625801][ T9879] ? rxrpc_unuse_local+0x23/0x70 [ 76.630712][ T9879] ? rxrpc_unuse_local+0x23/0x70 [ 76.635623][ T9879] __kasan_report.cold+0x5/0x36 [ 76.640472][ T9879] ? _raw_read_unlock_irqrestore+0xd1/0xe0 [ 76.646252][ T9879] ? rxrpc_unuse_local+0x23/0x70 [ 76.651167][ T9879] kasan_report+0x12/0x17 [ 76.655486][ T9879] check_memory_region+0x134/0x1a0 [ 76.660834][ T9879] __kasan_check_write+0x14/0x20 [ 76.665747][ T9879] rxrpc_unuse_local+0x23/0x70 [ 76.670487][ T9879] rxrpc_release+0x47d/0x840 [ 76.675059][ T9879] __sock_release+0xce/0x280 [ 76.679632][ T9879] sock_close+0x1e/0x30 [ 76.683769][ T9879] __fput+0x2ff/0x890 [ 76.687731][ T9879] ? __sock_release+0x280/0x280 [ 76.692560][ T9879] ____fput+0x16/0x20 [ 76.696539][ T9879] task_work_run+0x145/0x1c0 [ 76.701180][ T9879] do_exit+0x92f/0x2e50 [ 76.705323][ T9879] ? __sanitizer_cov_trace_cmp1+0x11/0x20 [ 76.711030][ T9879] ? mm_update_next_owner+0x640/0x640 [ 76.716407][ T9879] ? fd_install+0x4d/0x60 [ 76.720725][ T9879] ? __sys_socket+0x180/0x220 [ 76.725379][ T9879] ? move_addr_to_kernel+0x80/0x80 [ 76.730468][ T9879] ? __ia32_sys_fallocate+0xf0/0xf0 [ 76.735644][ T9879] do_group_exit+0x135/0x360 [ 76.740215][ T9879] __x64_sys_exit_group+0x44/0x50 [ 76.745216][ T9879] do_syscall_64+0xfa/0x760 [ 76.749703][ T9879] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 76.755569][ T9879] RIP: 0033:0x43ed68 [ 76.759468][ T9879] Code: Bad RIP value. [ 76.763514][ T9879] RSP: 002b:00007fff85b8f4d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 76.771933][ T9879] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ed68 [ 76.779886][ T9879] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 76.787837][ T9879] RBP: 00000000004be568 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 76.795785][ T9879] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000001 [ 76.803745][ T9879] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 76.811700][ T9879] ================================================================== [ 76.820445][ T9879] Kernel panic - not syncing: panic_on_warn set ... [ 76.827219][ T9879] CPU: 1 PID: 9879 Comm: syz-executor659 Tainted: G B 5.3.0-rc3-next-20190809 #63 [ 76.837705][ T9879] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.850444][ T9879] Call Trace: [ 76.853719][ T9879] dump_stack+0x172/0x1f0 [ 76.858025][ T9879] panic+0x2dc/0x755 [ 76.861897][ T9879] ? add_taint.cold+0x16/0x16 [ 76.866553][ T9879] ? rxrpc_unuse_local+0x23/0x70 [ 76.871468][ T9879] ? preempt_schedule+0x4b/0x60 [ 76.876291][ T9879] ? ___preempt_schedule+0x16/0x20 [ 76.881377][ T9879] ? trace_hardirqs_on+0x5e/0x240 [ 76.886377][ T9879] ? rxrpc_unuse_local+0x23/0x70 [ 76.891309][ T9879] end_report+0x47/0x4f [ 76.895441][ T9879] ? rxrpc_unuse_local+0x23/0x70 [ 76.900353][ T9879] __kasan_report.cold+0xe/0x36 [ 76.905180][ T9879] ? _raw_read_unlock_irqrestore+0xd1/0xe0 [ 76.910976][ T9879] ? rxrpc_unuse_local+0x23/0x70 [ 76.915892][ T9879] kasan_report+0x12/0x17 [ 76.920217][ T9879] check_memory_region+0x134/0x1a0 [ 76.925309][ T9879] __kasan_check_write+0x14/0x20 [ 76.930224][ T9879] rxrpc_unuse_local+0x23/0x70 [ 76.934963][ T9879] rxrpc_release+0x47d/0x840 [ 76.939721][ T9879] __sock_release+0xce/0x280 [ 76.944295][ T9879] sock_close+0x1e/0x30 [ 76.948427][ T9879] __fput+0x2ff/0x890 [ 76.952401][ T9879] ? __sock_release+0x280/0x280 [ 76.957228][ T9879] ____fput+0x16/0x20 [ 76.961207][ T9879] task_work_run+0x145/0x1c0 [ 76.965780][ T9879] do_exit+0x92f/0x2e50 [ 76.969913][ T9879] ? __sanitizer_cov_trace_cmp1+0x11/0x20 [ 76.975611][ T9879] ? mm_update_next_owner+0x640/0x640 [ 76.980963][ T9879] ? fd_install+0x4d/0x60 [ 76.985291][ T9879] ? __sys_socket+0x180/0x220 [ 76.989950][ T9879] ? move_addr_to_kernel+0x80/0x80 [ 76.995040][ T9879] ? __ia32_sys_fallocate+0xf0/0xf0 [ 77.000218][ T9879] do_group_exit+0x135/0x360 [ 77.004815][ T9879] __x64_sys_exit_group+0x44/0x50 [ 77.009832][ T9879] do_syscall_64+0xfa/0x760 [ 77.014312][ T9879] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 77.020181][ T9879] RIP: 0033:0x43ed68 [ 77.024060][ T9879] Code: Bad RIP value. [ 77.028099][ T9879] RSP: 002b:00007fff85b8f4d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 77.036492][ T9879] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ed68 [ 77.044451][ T9879] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 77.052397][ T9879] RBP: 00000000004be568 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 77.060361][ T9879] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000001 [ 77.068329][ T9879] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 77.078649][ T9879] Kernel Offset: disabled [ 77.082978][ T9879] Rebooting in 86400 seconds..