Re: port-alpha/56197: ATF lib/libc/sys/t_ptrace_wait bytes_transfer_eof_pt_read_d hard hang on Alpha under Qemu

[Jason Thorpe <thorpej%me.com@localhost>]

The following reply was made to PR port-alpha/56197; it has been noted by GNATS.

From: Jason Thorpe <thorpej%me.com@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: port-alpha/56197: ATF lib/libc/sys/t_ptrace_wait
 bytes_transfer_eof_pt_read_d hard hang on Alpha under Qemu
Date: Sat, 22 May 2021 11:24:08 -0700

 Ok, it looks like we=E2=80=99re endlessly tight-looping in MM faults.  =
 Got a somewhat useful backtrace here:
 
 db{0}>=20
 cpu_Debugger() at netbsd:cpu_Debugger+0x4
 comintr.part.0() at netbsd:comintr.part.0+0xb74
 alpha_shared_intr_wrapper() at netbsd:alpha_shared_intr_wrapper+0x38
 alpha_shared_intr_dispatch() at netbsd:alpha_shared_intr_dispatch+0x5c
 sio_iointr() at netbsd:sio_iointr+0x44
 interrupt() at netbsd:interrupt+0x258
 XentInt() at netbsd:XentInt+0x1c
 --- interrupt (from ipl 0) ---
 uvm_map_lookup_entry() at netbsd:uvm_map_lookup_entry
 uvm_fault_internal() at netbsd:uvm_fault_internal+0x130
 trap() at netbsd:trap+0x51c
 XentMM() at netbsd:XentMM+0x20
 --- memory management fault ---
 kcopyerr() at netbsd:kcopyerr+0xc
 kcopy() at netbsd:kcopy+0x40
 copyout_vmspace() at netbsd:copyout_vmspace+0x84
 uiomove() at netbsd:uiomove+0xbc
 uvm_io() at netbsd:uvm_io+0x148
 process_domem() at netbsd:process_domem+0xc0
 ptrace_doio() at netbsd:ptrace_doio+0xe4
 do_ptrace() at netbsd:do_ptrace+0x6e0
 sys_ptrace() at netbsd:sys_ptrace+0x40
 syscall() at netbsd:syscall+0x1f0
 XentSys() at netbsd:XentSys+0x5c
 --- syscall (26) ---
 --- user mode ---
 db{0}>
 
 -- thorpej