[ 72.334082][ T26] audit: type=1800 audit(1565548944.951:26): pid=10198 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 72.357766][ T26] audit: type=1800 audit(1565548944.961:27): pid=10198 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 72.390400][ T26] audit: type=1800 audit(1565548944.961:28): pid=10198 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 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. [ 73.270087][ T26] audit: type=1800 audit(1565548945.931:29): pid=10198 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 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.36' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 85.989739][T10351] ================================================================== [ 85.997986][T10351] BUG: KASAN: null-ptr-deref in rxrpc_unuse_local+0x23/0x70 [ 86.005252][T10351] Write of size 4 at addr 0000000000000010 by task syz-executor126/10351 [ 86.013643][T10351] [ 86.015959][T10351] CPU: 1 PID: 10351 Comm: syz-executor126 Not tainted 5.3.0-rc3+ #157 [ 86.024210][T10351] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 86.034302][T10351] Call Trace: [ 86.037610][T10351] dump_stack+0x172/0x1f0 [ 86.041947][T10351] ? rxrpc_unuse_local+0x23/0x70 [ 86.046893][T10351] ? rxrpc_unuse_local+0x23/0x70 [ 86.051829][T10351] __kasan_report.cold+0x5/0x36 [ 86.056690][T10351] ? _raw_read_unlock_irqrestore+0xc1/0xe0 [ 86.062569][T10351] ? rxrpc_unuse_local+0x23/0x70 [ 86.067519][T10351] kasan_report+0x12/0x17 [ 86.072297][T10351] check_memory_region+0x134/0x1a0 [ 86.077516][T10351] __kasan_check_write+0x14/0x20 [ 86.082579][T10351] rxrpc_unuse_local+0x23/0x70 [ 86.087588][T10351] rxrpc_release+0x47d/0x840 [ 86.092183][T10351] __sock_release+0xce/0x280 [ 86.096862][T10351] sock_close+0x1e/0x30 [ 86.101146][T10351] __fput+0x2ff/0x890 [ 86.105118][T10351] ? __sock_release+0x280/0x280 [ 86.109957][T10351] ____fput+0x16/0x20 [ 86.114038][T10351] task_work_run+0x145/0x1c0 [ 86.118639][T10351] do_exit+0x92f/0x2e50 [ 86.122804][T10351] ? __sanitizer_cov_trace_const_cmp4+0x1/0x20 [ 86.129077][T10351] ? mm_update_next_owner+0x640/0x640 [ 86.134454][T10351] ? fd_install+0x4d/0x60 [ 86.138920][T10351] ? __sys_socket+0x180/0x220 [ 86.143640][T10351] ? move_addr_to_kernel+0x80/0x80 [ 86.148751][T10351] ? __ia32_sys_fallocate+0xf0/0xf0 [ 86.153956][T10351] do_group_exit+0x135/0x360 [ 86.158553][T10351] __x64_sys_exit_group+0x44/0x50 [ 86.163671][T10351] do_syscall_64+0xfd/0x6a0 [ 86.168275][T10351] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 86.174215][T10351] RIP: 0033:0x43ed68 [ 86.178118][T10351] Code: Bad RIP value. [ 86.182324][T10351] RSP: 002b:00007ffe99f24718 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 86.190830][T10351] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ed68 [ 86.198900][T10351] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 86.206981][T10351] RBP: 00000000004be568 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 86.215007][T10351] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000001 [ 86.223025][T10351] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 86.231110][T10351] ================================================================== [ 86.239477][T10351] Kernel panic - not syncing: panic_on_warn set ... [ 86.246198][T10351] CPU: 1 PID: 10351 Comm: syz-executor126 Tainted: G B 5.3.0-rc3+ #157 [ 86.255772][T10351] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 86.265918][T10351] Call Trace: [ 86.269215][T10351] dump_stack+0x172/0x1f0 [ 86.273599][T10351] panic+0x2dc/0x755 [ 86.277734][T10351] ? add_taint.cold+0x16/0x16 [ 86.282416][T10351] ? rxrpc_unuse_local+0x23/0x70 [ 86.287372][T10351] ? preempt_schedule+0x4b/0x60 [ 86.292224][T10351] ? ___preempt_schedule+0x16/0x20 [ 86.297453][T10351] ? trace_hardirqs_on+0x5e/0x240 [ 86.302556][T10351] ? rxrpc_unuse_local+0x23/0x70 [ 86.307629][T10351] end_report+0x47/0x4f [ 86.311803][T10351] ? rxrpc_unuse_local+0x23/0x70 [ 86.316867][T10351] __kasan_report.cold+0xe/0x36 [ 86.321715][T10351] ? _raw_read_unlock_irqrestore+0xc1/0xe0 [ 86.327522][T10351] ? rxrpc_unuse_local+0x23/0x70 [ 86.332489][T10351] kasan_report+0x12/0x17 [ 86.336817][T10351] check_memory_region+0x134/0x1a0 [ 86.341926][T10351] __kasan_check_write+0x14/0x20 [ 86.346856][T10351] rxrpc_unuse_local+0x23/0x70 [ 86.351606][T10351] rxrpc_release+0x47d/0x840 [ 86.356181][T10351] __sock_release+0xce/0x280 [ 86.360762][T10351] sock_close+0x1e/0x30 [ 86.364951][T10351] __fput+0x2ff/0x890 [ 86.368923][T10351] ? __sock_release+0x280/0x280 [ 86.373760][T10351] ____fput+0x16/0x20 [ 86.377726][T10351] task_work_run+0x145/0x1c0 [ 86.382526][T10351] do_exit+0x92f/0x2e50 [ 86.386731][T10351] ? __sanitizer_cov_trace_const_cmp4+0x1/0x20 [ 86.393759][T10351] ? mm_update_next_owner+0x640/0x640 [ 86.399133][T10351] ? fd_install+0x4d/0x60 [ 86.403460][T10351] ? __sys_socket+0x180/0x220 [ 86.408133][T10351] ? move_addr_to_kernel+0x80/0x80 [ 86.413327][T10351] ? __ia32_sys_fallocate+0xf0/0xf0 [ 86.418551][T10351] do_group_exit+0x135/0x360 [ 86.423134][T10351] __x64_sys_exit_group+0x44/0x50 [ 86.428142][T10351] do_syscall_64+0xfd/0x6a0 [ 86.432634][T10351] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 86.438557][T10351] RIP: 0033:0x43ed68 [ 86.442445][T10351] Code: Bad RIP value. [ 86.446494][T10351] RSP: 002b:00007ffe99f24718 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 86.454961][T10351] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ed68 [ 86.463028][T10351] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 86.471012][T10351] RBP: 00000000004be568 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 86.478983][T10351] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000001 [ 86.486950][T10351] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 86.495923][T10351] Kernel Offset: disabled [ 86.500328][T10351] Rebooting in 86400 seconds..