[....] 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. [ 65.343184][ T24] kauditd_printk_skb: 7 callbacks suppressed [ 65.343195][ T24] audit: type=1800 audit(1565554899.592:29): pid=9744 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 [ 65.377183][ T24] audit: type=1800 audit(1565554899.592:30): pid=9744 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 '10.128.1.5' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 90.290775][ T9897] ================================================================== [ 90.298879][ T9897] BUG: KASAN: null-ptr-deref in rxrpc_unuse_local+0x23/0x70 [ 90.306258][ T9897] Write of size 4 at addr 0000000000000010 by task syz-executor793/9897 [ 90.314671][ T9897] [ 90.316990][ T9897] CPU: 1 PID: 9897 Comm: syz-executor793 Not tainted 5.3.0-rc3+ #157 [ 90.325554][ T9897] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 90.335599][ T9897] Call Trace: [ 90.338876][ T9897] dump_stack+0x172/0x1f0 [ 90.343258][ T9897] ? rxrpc_unuse_local+0x23/0x70 [ 90.348216][ T9897] ? rxrpc_unuse_local+0x23/0x70 [ 90.353139][ T9897] __kasan_report.cold+0x5/0x36 [ 90.358052][ T9897] ? _raw_read_unlock_irqrestore+0xc1/0xe0 [ 90.363860][ T9897] ? rxrpc_unuse_local+0x23/0x70 [ 90.368915][ T9897] kasan_report+0x12/0x17 [ 90.373367][ T9897] check_memory_region+0x134/0x1a0 [ 90.378585][ T9897] __kasan_check_write+0x14/0x20 [ 90.383871][ T9897] rxrpc_unuse_local+0x23/0x70 [ 90.388619][ T9897] rxrpc_release+0x47d/0x840 [ 90.393191][ T9897] __sock_release+0xce/0x280 [ 90.397762][ T9897] sock_close+0x1e/0x30 [ 90.401948][ T9897] __fput+0x2ff/0x890 [ 90.406148][ T9897] ? __sock_release+0x280/0x280 [ 90.411111][ T9897] ____fput+0x16/0x20 [ 90.415113][ T9897] task_work_run+0x145/0x1c0 [ 90.419924][ T9897] do_exit+0x92f/0x2e50 [ 90.424385][ T9897] ? __sanitizer_cov_trace_const_cmp4+0x1/0x20 [ 90.430523][ T9897] ? mm_update_next_owner+0x640/0x640 [ 90.436998][ T9897] ? fd_install+0x4d/0x60 [ 90.441576][ T9897] ? __sys_socket+0x180/0x220 [ 90.446352][ T9897] ? move_addr_to_kernel+0x80/0x80 [ 90.451598][ T9897] ? __ia32_sys_fallocate+0xf0/0xf0 [ 90.456998][ T9897] do_group_exit+0x135/0x360 [ 90.461754][ T9897] __x64_sys_exit_group+0x44/0x50 [ 90.466976][ T9897] do_syscall_64+0xfd/0x6a0 [ 90.471488][ T9897] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 90.477363][ T9897] RIP: 0033:0x43ed68 [ 90.481242][ T9897] Code: Bad RIP value. [ 90.485300][ T9897] RSP: 002b:00007ffdb96be2e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 90.493701][ T9897] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ed68 [ 90.501841][ T9897] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 90.509822][ T9897] RBP: 00000000004be568 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 90.517993][ T9897] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000001 [ 90.525958][ T9897] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 90.534050][ T9897] ================================================================== [ 90.542662][ T9897] Kernel panic - not syncing: panic_on_warn set ... [ 90.549254][ T9897] CPU: 1 PID: 9897 Comm: syz-executor793 Tainted: G B 5.3.0-rc3+ #157 [ 90.558683][ T9897] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 90.568713][ T9897] Call Trace: [ 90.571985][ T9897] dump_stack+0x172/0x1f0 [ 90.576295][ T9897] panic+0x2dc/0x755 [ 90.580172][ T9897] ? add_taint.cold+0x16/0x16 [ 90.584828][ T9897] ? rxrpc_unuse_local+0x23/0x70 [ 90.589827][ T9897] ? preempt_schedule+0x4b/0x60 [ 90.594680][ T9897] ? ___preempt_schedule+0x16/0x20 [ 90.599847][ T9897] ? trace_hardirqs_on+0x5e/0x240 [ 90.604878][ T9897] ? rxrpc_unuse_local+0x23/0x70 [ 90.609953][ T9897] end_report+0x47/0x4f [ 90.614146][ T9897] ? rxrpc_unuse_local+0x23/0x70 [ 90.619137][ T9897] __kasan_report.cold+0xe/0x36 [ 90.624063][ T9897] ? _raw_read_unlock_irqrestore+0xc1/0xe0 [ 90.629990][ T9897] ? rxrpc_unuse_local+0x23/0x70 [ 90.635089][ T9897] kasan_report+0x12/0x17 [ 90.639415][ T9897] check_memory_region+0x134/0x1a0 [ 90.644511][ T9897] __kasan_check_write+0x14/0x20 [ 90.649429][ T9897] rxrpc_unuse_local+0x23/0x70 [ 90.654173][ T9897] rxrpc_release+0x47d/0x840 [ 90.658900][ T9897] __sock_release+0xce/0x280 [ 90.663474][ T9897] sock_close+0x1e/0x30 [ 90.667639][ T9897] __fput+0x2ff/0x890 [ 90.671762][ T9897] ? __sock_release+0x280/0x280 [ 90.676685][ T9897] ____fput+0x16/0x20 [ 90.680672][ T9897] task_work_run+0x145/0x1c0 [ 90.685267][ T9897] do_exit+0x92f/0x2e50 [ 90.689483][ T9897] ? __sanitizer_cov_trace_const_cmp4+0x1/0x20 [ 90.695789][ T9897] ? mm_update_next_owner+0x640/0x640 [ 90.701228][ T9897] ? fd_install+0x4d/0x60 [ 90.705555][ T9897] ? __sys_socket+0x180/0x220 [ 90.710219][ T9897] ? move_addr_to_kernel+0x80/0x80 [ 90.715421][ T9897] ? __ia32_sys_fallocate+0xf0/0xf0 [ 90.720616][ T9897] do_group_exit+0x135/0x360 [ 90.725316][ T9897] __x64_sys_exit_group+0x44/0x50 [ 90.730332][ T9897] do_syscall_64+0xfd/0x6a0 [ 90.734821][ T9897] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 90.740695][ T9897] RIP: 0033:0x43ed68 [ 90.744576][ T9897] Code: Bad RIP value. [ 90.748681][ T9897] RSP: 002b:00007ffdb96be2e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 90.757150][ T9897] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ed68 [ 90.765176][ T9897] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 90.773156][ T9897] RBP: 00000000004be568 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 90.781177][ T9897] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000001 [ 90.789143][ T9897] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 90.798388][ T9897] Kernel Offset: disabled [ 90.802774][ T9897] Rebooting in 86400 seconds..