[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 70.166313][ T26] audit: type=1800 audit(1565518838.721:25): pid=9983 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 70.205638][ T26] audit: type=1800 audit(1565518838.721:26): pid=9983 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 70.242054][ T26] audit: type=1800 audit(1565518838.721:27): pid=9983 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] 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 '10.128.0.177' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 77.751861][T10137] ================================================================== [ 77.760187][T10137] BUG: KASAN: null-ptr-deref in rxrpc_unuse_local+0x23/0x70 [ 77.767465][T10137] Write of size 4 at addr 0000000000000010 by task syz-executor387/10137 [ 77.775851][T10137] [ 77.778170][T10137] CPU: 1 PID: 10137 Comm: syz-executor387 Not tainted 5.3.0-rc3-next-20190809 #63 [ 77.787341][T10137] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.797472][T10137] Call Trace: [ 77.800768][T10137] dump_stack+0x172/0x1f0 [ 77.805083][T10137] ? rxrpc_unuse_local+0x23/0x70 [ 77.810200][T10137] ? rxrpc_unuse_local+0x23/0x70 [ 77.815118][T10137] __kasan_report.cold+0x5/0x36 [ 77.819957][T10137] ? _raw_read_unlock_irqrestore+0xd1/0xe0 [ 77.825739][T10137] ? rxrpc_unuse_local+0x23/0x70 [ 77.830654][T10137] kasan_report+0x12/0x17 [ 77.834967][T10137] check_memory_region+0x134/0x1a0 [ 77.840069][T10137] __kasan_check_write+0x14/0x20 [ 77.844986][T10137] rxrpc_unuse_local+0x23/0x70 [ 77.849754][T10137] rxrpc_release+0x47d/0x840 [ 77.854331][T10137] __sock_release+0xce/0x280 [ 77.858911][T10137] sock_close+0x1e/0x30 [ 77.863065][T10137] __fput+0x2ff/0x890 [ 77.867033][T10137] ? __sock_release+0x280/0x280 [ 77.871865][T10137] ____fput+0x16/0x20 [ 77.875831][T10137] task_work_run+0x145/0x1c0 [ 77.880407][T10137] do_exit+0x92f/0x2e50 [ 77.884558][T10137] ? __sanitizer_cov_trace_cmp1+0x11/0x20 [ 77.890262][T10137] ? mm_update_next_owner+0x640/0x640 [ 77.895627][T10137] ? fd_install+0x4d/0x60 [ 77.899940][T10137] ? __sys_socket+0x180/0x220 [ 77.904597][T10137] ? move_addr_to_kernel+0x80/0x80 [ 77.909694][T10137] ? __ia32_sys_fallocate+0xf0/0xf0 [ 77.914879][T10137] do_group_exit+0x135/0x360 [ 77.919449][T10137] __x64_sys_exit_group+0x44/0x50 [ 77.924455][T10137] do_syscall_64+0xfa/0x760 [ 77.928948][T10137] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 77.934817][T10137] RIP: 0033:0x43ed68 [ 77.938703][T10137] Code: Bad RIP value. [ 77.942752][T10137] RSP: 002b:00007fff114a4e28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 77.951147][T10137] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ed68 [ 77.959117][T10137] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 77.967071][T10137] RBP: 00000000004be568 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 77.975021][T10137] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000001 [ 77.982973][T10137] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 77.990931][T10137] ================================================================== [ 77.999467][T10137] Kernel panic - not syncing: panic_on_warn set ... [ 78.006070][T10137] CPU: 1 PID: 10137 Comm: syz-executor387 Tainted: G B 5.3.0-rc3-next-20190809 #63 [ 78.016632][T10137] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 78.026683][T10137] Call Trace: [ 78.029969][T10137] dump_stack+0x172/0x1f0 [ 78.034280][T10137] panic+0x2dc/0x755 [ 78.038163][T10137] ? add_taint.cold+0x16/0x16 [ 78.042831][T10137] ? rxrpc_unuse_local+0x23/0x70 [ 78.049204][T10137] ? preempt_schedule+0x4b/0x60 [ 78.054042][T10137] ? ___preempt_schedule+0x16/0x20 [ 78.059136][T10137] ? trace_hardirqs_on+0x5e/0x240 [ 78.064143][T10137] ? rxrpc_unuse_local+0x23/0x70 [ 78.069088][T10137] end_report+0x47/0x4f [ 78.073223][T10137] ? rxrpc_unuse_local+0x23/0x70 [ 78.078138][T10137] __kasan_report.cold+0xe/0x36 [ 78.082976][T10137] ? _raw_read_unlock_irqrestore+0xd1/0xe0 [ 78.088759][T10137] ? rxrpc_unuse_local+0x23/0x70 [ 78.093680][T10137] kasan_report+0x12/0x17 [ 78.097993][T10137] check_memory_region+0x134/0x1a0 [ 78.103087][T10137] __kasan_check_write+0x14/0x20 [ 78.108007][T10137] rxrpc_unuse_local+0x23/0x70 [ 78.112746][T10137] rxrpc_release+0x47d/0x840 [ 78.117343][T10137] __sock_release+0xce/0x280 [ 78.121916][T10137] sock_close+0x1e/0x30 [ 78.126051][T10137] __fput+0x2ff/0x890 [ 78.130024][T10137] ? __sock_release+0x280/0x280 [ 78.134860][T10137] ____fput+0x16/0x20 [ 78.138844][T10137] task_work_run+0x145/0x1c0 [ 78.143427][T10137] do_exit+0x92f/0x2e50 [ 78.147569][T10137] ? __sanitizer_cov_trace_cmp1+0x11/0x20 [ 78.153271][T10137] ? mm_update_next_owner+0x640/0x640 [ 78.158628][T10137] ? fd_install+0x4d/0x60 [ 78.162939][T10137] ? __sys_socket+0x180/0x220 [ 78.167616][T10137] ? move_addr_to_kernel+0x80/0x80 [ 78.172799][T10137] ? __ia32_sys_fallocate+0xf0/0xf0 [ 78.177979][T10137] do_group_exit+0x135/0x360 [ 78.182552][T10137] __x64_sys_exit_group+0x44/0x50 [ 78.187562][T10137] do_syscall_64+0xfa/0x760 [ 78.192048][T10137] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 78.197917][T10137] RIP: 0033:0x43ed68 [ 78.201796][T10137] Code: Bad RIP value. [ 78.205836][T10137] RSP: 002b:00007fff114a4e28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 78.214226][T10137] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ed68 [ 78.222175][T10137] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 78.230127][T10137] RBP: 00000000004be568 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 78.238082][T10137] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000001 [ 78.246034][T10137] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 78.255425][T10137] Kernel Offset: disabled [ 78.259755][T10137] Rebooting in 86400 seconds..