[....] 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. [ 65.815712][ T26] kauditd_printk_skb: 7 callbacks suppressed [ 65.815723][ T26] audit: type=1800 audit(1565566490.202:29): pid=9757 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 [ 65.842977][ T26] audit: type=1800 audit(1565566490.202:30): pid=9757 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 '10.128.1.34' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 75.835674][ T9912] ================================================================== [ 75.843767][ T9912] BUG: KASAN: null-ptr-deref in rxrpc_unuse_local+0x23/0x70 [ 75.851093][ T9912] Write of size 4 at addr 0000000000000010 by task syz-executor837/9912 [ 75.859383][ T9912] [ 75.861693][ T9912] CPU: 0 PID: 9912 Comm: syz-executor837 Not tainted 5.3.0-rc3-next-20190809 #63 [ 75.870783][ T9912] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 75.880812][ T9912] Call Trace: [ 75.884087][ T9912] dump_stack+0x172/0x1f0 [ 75.888391][ T9912] ? rxrpc_unuse_local+0x23/0x70 [ 75.893302][ T9912] ? rxrpc_unuse_local+0x23/0x70 [ 75.898213][ T9912] __kasan_report.cold+0x5/0x36 [ 75.903298][ T9912] ? _raw_read_unlock_irqrestore+0xd1/0xe0 [ 75.909078][ T9912] ? rxrpc_unuse_local+0x23/0x70 [ 75.913988][ T9912] kasan_report+0x12/0x17 [ 75.918292][ T9912] check_memory_region+0x134/0x1a0 [ 75.923378][ T9912] __kasan_check_write+0x14/0x20 [ 75.928306][ T9912] rxrpc_unuse_local+0x23/0x70 [ 75.933058][ T9912] rxrpc_release+0x47d/0x840 [ 75.942064][ T9912] __sock_release+0xce/0x280 [ 75.946633][ T9912] sock_close+0x1e/0x30 [ 75.950763][ T9912] __fput+0x2ff/0x890 [ 75.954719][ T9912] ? __sock_release+0x280/0x280 [ 75.959542][ T9912] ____fput+0x16/0x20 [ 75.963508][ T9912] task_work_run+0x145/0x1c0 [ 75.968079][ T9912] do_exit+0x92f/0x2e50 [ 75.972225][ T9912] ? __sanitizer_cov_trace_cmp1+0x11/0x20 [ 75.977921][ T9912] ? mm_update_next_owner+0x640/0x640 [ 75.983266][ T9912] ? fd_install+0x4d/0x60 [ 75.987570][ T9912] ? __sys_socket+0x180/0x220 [ 75.992236][ T9912] ? move_addr_to_kernel+0x80/0x80 [ 75.997320][ T9912] ? __ia32_sys_fallocate+0xf0/0xf0 [ 76.002494][ T9912] do_group_exit+0x135/0x360 [ 76.007090][ T9912] __x64_sys_exit_group+0x44/0x50 [ 76.012099][ T9912] do_syscall_64+0xfa/0x760 [ 76.016582][ T9912] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 76.022445][ T9912] RIP: 0033:0x43ed68 [ 76.026324][ T9912] Code: Bad RIP value. [ 76.030377][ T9912] RSP: 002b:00007ffcc7bc8d88 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 76.038763][ T9912] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ed68 [ 76.046708][ T9912] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 76.054651][ T9912] RBP: 00000000004be568 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 76.062595][ T9912] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000001 [ 76.070542][ T9912] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 76.078495][ T9912] ================================================================== [ 76.086968][ T9912] Kernel panic - not syncing: panic_on_warn set ... [ 76.093564][ T9912] CPU: 0 PID: 9912 Comm: syz-executor837 Tainted: G B 5.3.0-rc3-next-20190809 #63 [ 76.104050][ T9912] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.114174][ T9912] Call Trace: [ 76.117444][ T9912] dump_stack+0x172/0x1f0 [ 76.121748][ T9912] panic+0x2dc/0x755 [ 76.125618][ T9912] ? add_taint.cold+0x16/0x16 [ 76.130279][ T9912] ? rxrpc_unuse_local+0x23/0x70 [ 76.135201][ T9912] ? preempt_schedule+0x4b/0x60 [ 76.140055][ T9912] ? ___preempt_schedule+0x16/0x20 [ 76.145146][ T9912] ? trace_hardirqs_on+0x5e/0x240 [ 76.150145][ T9912] ? rxrpc_unuse_local+0x23/0x70 [ 76.155073][ T9912] end_report+0x47/0x4f [ 76.159201][ T9912] ? rxrpc_unuse_local+0x23/0x70 [ 76.164112][ T9912] __kasan_report.cold+0xe/0x36 [ 76.168944][ T9912] ? _raw_read_unlock_irqrestore+0xd1/0xe0 [ 76.174732][ T9912] ? rxrpc_unuse_local+0x23/0x70 [ 76.179645][ T9912] kasan_report+0x12/0x17 [ 76.183962][ T9912] check_memory_region+0x134/0x1a0 [ 76.189049][ T9912] __kasan_check_write+0x14/0x20 [ 76.193957][ T9912] rxrpc_unuse_local+0x23/0x70 [ 76.198707][ T9912] rxrpc_release+0x47d/0x840 [ 76.203279][ T9912] __sock_release+0xce/0x280 [ 76.207863][ T9912] sock_close+0x1e/0x30 [ 76.212079][ T9912] __fput+0x2ff/0x890 [ 76.216044][ T9912] ? __sock_release+0x280/0x280 [ 76.220866][ T9912] ____fput+0x16/0x20 [ 76.224820][ T9912] task_work_run+0x145/0x1c0 [ 76.229413][ T9912] do_exit+0x92f/0x2e50 [ 76.233561][ T9912] ? __sanitizer_cov_trace_cmp1+0x11/0x20 [ 76.239257][ T9912] ? mm_update_next_owner+0x640/0x640 [ 76.244600][ T9912] ? fd_install+0x4d/0x60 [ 76.248902][ T9912] ? __sys_socket+0x180/0x220 [ 76.253551][ T9912] ? move_addr_to_kernel+0x80/0x80 [ 76.258635][ T9912] ? __ia32_sys_fallocate+0xf0/0xf0 [ 76.263808][ T9912] do_group_exit+0x135/0x360 [ 76.268379][ T9912] __x64_sys_exit_group+0x44/0x50 [ 76.273378][ T9912] do_syscall_64+0xfa/0x760 [ 76.277860][ T9912] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 76.283727][ T9912] RIP: 0033:0x43ed68 [ 76.287606][ T9912] Code: Bad RIP value. [ 76.291644][ T9912] RSP: 002b:00007ffcc7bc8d88 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 76.300054][ T9912] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ed68 [ 76.308012][ T9912] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 76.315957][ T9912] RBP: 00000000004be568 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 76.323901][ T9912] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000001 [ 76.331848][ T9912] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 76.341255][ T9912] Kernel Offset: disabled [ 76.345582][ T9912] Rebooting in 86400 seconds..