[....] 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. [ 62.099661][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 62.099670][ T26] audit: type=1800 audit(1565524838.576:29): pid=9612 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 [ 62.126390][ T26] audit: type=1800 audit(1565524838.586:30): pid=9612 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 '10.128.15.198' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 78.217832][ T9761] ================================================================== [ 78.226230][ T9761] BUG: KASAN: null-ptr-deref in rxrpc_unuse_local+0x23/0x70 [ 78.233499][ T9761] Write of size 4 at addr 0000000000000010 by task syz-executor431/9761 [ 78.241795][ T9761] [ 78.244252][ T9761] CPU: 0 PID: 9761 Comm: syz-executor431 Not tainted 5.3.0-rc3+ #157 [ 78.252405][ T9761] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 78.262462][ T9761] Call Trace: [ 78.265758][ T9761] dump_stack+0x172/0x1f0 [ 78.270086][ T9761] ? rxrpc_unuse_local+0x23/0x70 [ 78.275013][ T9761] ? rxrpc_unuse_local+0x23/0x70 [ 78.279954][ T9761] __kasan_report.cold+0x5/0x36 [ 78.284923][ T9761] ? _raw_read_unlock_irqrestore+0xc1/0xe0 [ 78.290738][ T9761] ? rxrpc_unuse_local+0x23/0x70 [ 78.295792][ T9761] kasan_report+0x12/0x17 [ 78.300130][ T9761] check_memory_region+0x134/0x1a0 [ 78.305444][ T9761] __kasan_check_write+0x14/0x20 [ 78.310376][ T9761] rxrpc_unuse_local+0x23/0x70 [ 78.315530][ T9761] rxrpc_release+0x47d/0x840 [ 78.320222][ T9761] __sock_release+0xce/0x280 [ 78.324936][ T9761] sock_close+0x1e/0x30 [ 78.329192][ T9761] __fput+0x2ff/0x890 [ 78.333353][ T9761] ? __sock_release+0x280/0x280 [ 78.338236][ T9761] ____fput+0x16/0x20 [ 78.342324][ T9761] task_work_run+0x145/0x1c0 [ 78.347197][ T9761] do_exit+0x92f/0x2e50 [ 78.351354][ T9761] ? __sanitizer_cov_trace_const_cmp4+0x1/0x20 [ 78.357506][ T9761] ? mm_update_next_owner+0x640/0x640 [ 78.363013][ T9761] ? fd_install+0x4d/0x60 [ 78.367452][ T9761] ? __sys_socket+0x180/0x220 [ 78.372116][ T9761] ? move_addr_to_kernel+0x80/0x80 [ 78.377499][ T9761] ? __ia32_sys_fallocate+0xf0/0xf0 [ 78.382697][ T9761] do_group_exit+0x135/0x360 [ 78.387385][ T9761] __x64_sys_exit_group+0x44/0x50 [ 78.392486][ T9761] do_syscall_64+0xfd/0x6a0 [ 78.397123][ T9761] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 78.403321][ T9761] RIP: 0033:0x43ed68 [ 78.407209][ T9761] Code: Bad RIP value. [ 78.411373][ T9761] RSP: 002b:00007ffc58b38898 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 78.419869][ T9761] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ed68 [ 78.427829][ T9761] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 78.435931][ T9761] RBP: 00000000004be568 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 78.443951][ T9761] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000001 [ 78.452100][ T9761] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 78.460195][ T9761] ================================================================== [ 78.468384][ T9761] Kernel panic - not syncing: panic_on_warn set ... [ 78.475105][ T9761] CPU: 0 PID: 9761 Comm: syz-executor431 Tainted: G B 5.3.0-rc3+ #157 [ 78.484638][ T9761] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 78.494775][ T9761] Call Trace: [ 78.498066][ T9761] dump_stack+0x172/0x1f0 [ 78.502516][ T9761] panic+0x2dc/0x755 [ 78.506601][ T9761] ? add_taint.cold+0x16/0x16 [ 78.511287][ T9761] ? rxrpc_unuse_local+0x23/0x70 [ 78.516338][ T9761] ? preempt_schedule+0x4b/0x60 [ 78.521292][ T9761] ? ___preempt_schedule+0x16/0x20 [ 78.526649][ T9761] ? trace_hardirqs_on+0x5e/0x240 [ 78.531668][ T9761] ? rxrpc_unuse_local+0x23/0x70 [ 78.536598][ T9761] end_report+0x47/0x4f [ 78.540759][ T9761] ? rxrpc_unuse_local+0x23/0x70 [ 78.545690][ T9761] __kasan_report.cold+0xe/0x36 [ 78.550523][ T9761] ? _raw_read_unlock_irqrestore+0xc1/0xe0 [ 78.556437][ T9761] ? rxrpc_unuse_local+0x23/0x70 [ 78.561412][ T9761] kasan_report+0x12/0x17 [ 78.565734][ T9761] check_memory_region+0x134/0x1a0 [ 78.570962][ T9761] __kasan_check_write+0x14/0x20 [ 78.576007][ T9761] rxrpc_unuse_local+0x23/0x70 [ 78.580762][ T9761] rxrpc_release+0x47d/0x840 [ 78.585345][ T9761] __sock_release+0xce/0x280 [ 78.589921][ T9761] sock_close+0x1e/0x30 [ 78.594080][ T9761] __fput+0x2ff/0x890 [ 78.598059][ T9761] ? __sock_release+0x280/0x280 [ 78.603015][ T9761] ____fput+0x16/0x20 [ 78.606991][ T9761] task_work_run+0x145/0x1c0 [ 78.611564][ T9761] do_exit+0x92f/0x2e50 [ 78.615786][ T9761] ? __sanitizer_cov_trace_const_cmp4+0x1/0x20 [ 78.622156][ T9761] ? mm_update_next_owner+0x640/0x640 [ 78.627635][ T9761] ? fd_install+0x4d/0x60 [ 78.631950][ T9761] ? __sys_socket+0x180/0x220 [ 78.636617][ T9761] ? move_addr_to_kernel+0x80/0x80 [ 78.641713][ T9761] ? __ia32_sys_fallocate+0xf0/0xf0 [ 78.646972][ T9761] do_group_exit+0x135/0x360 [ 78.651765][ T9761] __x64_sys_exit_group+0x44/0x50 [ 78.656820][ T9761] do_syscall_64+0xfd/0x6a0 [ 78.661326][ T9761] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 78.667213][ T9761] RIP: 0033:0x43ed68 [ 78.671216][ T9761] Code: Bad RIP value. [ 78.675264][ T9761] RSP: 002b:00007ffc58b38898 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 78.683659][ T9761] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ed68 [ 78.691789][ T9761] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 78.699847][ T9761] RBP: 00000000004be568 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 78.707972][ T9761] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000001 [ 78.716005][ T9761] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 78.725767][ T9761] Kernel Offset: disabled [ 78.730164][ T9761] Rebooting in 86400 seconds..