[....] 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. [ 64.674416][ T27] kauditd_printk_skb: 7 callbacks suppressed [ 64.674426][ T27] audit: type=1800 audit(1565571701.971:29): pid=9693 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 [ 64.707672][ T27] audit: type=1800 audit(1565571701.971:30): pid=9693 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 '10.128.0.31' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 74.920948][ T9847] ================================================================== [ 74.929196][ T9847] BUG: KASAN: null-ptr-deref in rxrpc_unuse_local+0x23/0x70 [ 74.936468][ T9847] Write of size 4 at addr 0000000000000010 by task syz-executor660/9847 [ 74.944820][ T9847] [ 74.947138][ T9847] CPU: 0 PID: 9847 Comm: syz-executor660 Not tainted 5.3.0-rc3+ #158 [ 74.955174][ T9847] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.965276][ T9847] Call Trace: [ 74.968560][ T9847] dump_stack+0x172/0x1f0 [ 74.972873][ T9847] ? rxrpc_unuse_local+0x23/0x70 [ 74.977789][ T9847] ? rxrpc_unuse_local+0x23/0x70 [ 74.982738][ T9847] __kasan_report.cold+0x5/0x36 [ 74.987578][ T9847] ? _raw_read_unlock_irqrestore+0xc1/0xe0 [ 74.993509][ T9847] ? rxrpc_unuse_local+0x23/0x70 [ 74.998429][ T9847] kasan_report+0x12/0x17 [ 75.002740][ T9847] check_memory_region+0x134/0x1a0 [ 75.007855][ T9847] __kasan_check_write+0x14/0x20 [ 75.012777][ T9847] rxrpc_unuse_local+0x23/0x70 [ 75.017583][ T9847] rxrpc_release+0x47d/0x840 [ 75.022172][ T9847] __sock_release+0xce/0x280 [ 75.026796][ T9847] sock_close+0x1e/0x30 [ 75.030941][ T9847] __fput+0x2ff/0x890 [ 75.034967][ T9847] ? __sock_release+0x280/0x280 [ 75.039804][ T9847] ____fput+0x16/0x20 [ 75.043778][ T9847] task_work_run+0x145/0x1c0 [ 75.048358][ T9847] do_exit+0x92f/0x2e50 [ 75.052655][ T9847] ? __sanitizer_cov_trace_const_cmp4+0x11/0x20 [ 75.058891][ T9847] ? mm_update_next_owner+0x640/0x640 [ 75.064425][ T9847] ? fd_install+0x4d/0x60 [ 75.068740][ T9847] ? __sys_socket+0x180/0x220 [ 75.073396][ T9847] ? move_addr_to_kernel+0x80/0x80 [ 75.078486][ T9847] ? __ia32_sys_fallocate+0xf0/0xf0 [ 75.083723][ T9847] do_group_exit+0x135/0x360 [ 75.088295][ T9847] __x64_sys_exit_group+0x44/0x50 [ 75.093295][ T9847] do_syscall_64+0xfd/0x6a0 [ 75.097775][ T9847] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 75.103653][ T9847] RIP: 0033:0x43ed68 [ 75.107558][ T9847] Code: Bad RIP value. [ 75.111608][ T9847] RSP: 002b:00007ffdc3cfddb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 75.120058][ T9847] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ed68 [ 75.128085][ T9847] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 75.136097][ T9847] RBP: 00000000004be568 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 75.144117][ T9847] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000001 [ 75.152084][ T9847] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 75.160052][ T9847] ================================================================== [ 75.168437][ T9847] Kernel panic - not syncing: panic_on_warn set ... [ 75.175231][ T9847] CPU: 0 PID: 9847 Comm: syz-executor660 Tainted: G B 5.3.0-rc3+ #158 [ 75.184899][ T9847] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 75.195095][ T9847] Call Trace: [ 75.198388][ T9847] dump_stack+0x172/0x1f0 [ 75.202708][ T9847] panic+0x2dc/0x755 [ 75.206580][ T9847] ? add_taint.cold+0x16/0x16 [ 75.211234][ T9847] ? rxrpc_unuse_local+0x23/0x70 [ 75.216161][ T9847] ? preempt_schedule+0x4b/0x60 [ 75.220989][ T9847] ? ___preempt_schedule+0x16/0x20 [ 75.226089][ T9847] ? trace_hardirqs_on+0x5e/0x240 [ 75.231102][ T9847] ? rxrpc_unuse_local+0x23/0x70 [ 75.236024][ T9847] end_report+0x47/0x4f [ 75.240209][ T9847] ? rxrpc_unuse_local+0x23/0x70 [ 75.245138][ T9847] __kasan_report.cold+0xe/0x36 [ 75.250015][ T9847] ? _raw_read_unlock_irqrestore+0xc1/0xe0 [ 75.255880][ T9847] ? rxrpc_unuse_local+0x23/0x70 [ 75.260907][ T9847] kasan_report+0x12/0x17 [ 75.265216][ T9847] check_memory_region+0x134/0x1a0 [ 75.270306][ T9847] __kasan_check_write+0x14/0x20 [ 75.275226][ T9847] rxrpc_unuse_local+0x23/0x70 [ 75.279974][ T9847] rxrpc_release+0x47d/0x840 [ 75.284561][ T9847] __sock_release+0xce/0x280 [ 75.289204][ T9847] sock_close+0x1e/0x30 [ 75.293340][ T9847] __fput+0x2ff/0x890 [ 75.297429][ T9847] ? __sock_release+0x280/0x280 [ 75.302266][ T9847] ____fput+0x16/0x20 [ 75.306319][ T9847] task_work_run+0x145/0x1c0 [ 75.310887][ T9847] do_exit+0x92f/0x2e50 [ 75.315044][ T9847] ? __sanitizer_cov_trace_const_cmp4+0x11/0x20 [ 75.321305][ T9847] ? mm_update_next_owner+0x640/0x640 [ 75.326762][ T9847] ? fd_install+0x4d/0x60 [ 75.331087][ T9847] ? __sys_socket+0x180/0x220 [ 75.335761][ T9847] ? move_addr_to_kernel+0x80/0x80 [ 75.340845][ T9847] ? __ia32_sys_fallocate+0xf0/0xf0 [ 75.346078][ T9847] do_group_exit+0x135/0x360 [ 75.350665][ T9847] __x64_sys_exit_group+0x44/0x50 [ 75.355666][ T9847] do_syscall_64+0xfd/0x6a0 [ 75.360166][ T9847] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 75.366034][ T9847] RIP: 0033:0x43ed68 [ 75.369961][ T9847] Code: Bad RIP value. [ 75.374008][ T9847] RSP: 002b:00007ffdc3cfddb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 75.382405][ T9847] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ed68 [ 75.390367][ T9847] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 75.398327][ T9847] RBP: 00000000004be568 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 75.406285][ T9847] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000001 [ 75.414284][ T9847] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 75.423401][ T9847] Kernel Offset: disabled [ 75.427726][ T9847] Rebooting in 86400 seconds..