kern/54735: sparc64 locks up in ptrace tests

[martin%NetBSD.org@localhost]

>Number:         54735
>Category:       kern
>Synopsis:       sparc64 locks up in ptrace tests
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Dec 04 09:10:00 +0000 2019
>Originator:     Martin Husemann
>Release:        NetBSD 9.99.19
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD thirdstage.duskware.de 9.99.19 NetBSD 9.99.19 (MODULAR) #257: Tue Dec 3 20:05:37 CET 2019 martin%thirdstage.duskware.de@localhost:/usr/src/sys/arch/sparc64/compile/MODULAR sparc64
Architecture: sparc64
Machine: sparc64
>Description:

Running atf tests on sparc64 locks up:


lib/libc/sys/t_ptrace_waitid (312/836): 358 test cases
    access_fpregs1: [0.047662s] Passed.
    access_fpregs2: [0.046871s] Passed.
    access_regs1: [0.046805s] Passed.
    access_regs2: [0.046726s] Passed.
    access_regs3: [0.046700s] Passed.
    access_regs4: [0.046769s] Passed.
    access_regs5: [0.047698s] Passed.
    access_regs6: [0.050041s] Passed.
    attach_lwpinfo0: [0.052279s] Passed.
    attach_lwpinfo1: [0.061252s] Passed.
    attach_lwpinfo2: 

and here the console is dead.

Can break into ddb:
db{0}> ps
PID    LID S CPU     FLAGS       STRUCT LWP *               NAME WAIT
20155    1 3   1        80          104cb76a0    t_ptrace_waitid pipe_rd
3127 >   4 7   0         0          1053df6c0    t_ptrace_waitid
3127 >   3 7   1         0          10f38cd60    t_ptrace_waitid
3127     1 3   0        80          10efbd9c0    t_ptrace_waitid pipe_rd
19683    1 2   0         0          10f3615c0    t_ptrace_waitid
[..]

but I get no usefull backtraces for either on-proc lwp.

>How-To-Repeat:
s/a

>Fix:
n/a