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bin/56974: 'amq -i' dumps core

>Number:         56974
>Category:       bin
>Synopsis:       'amq -i' dumps core with sigsev
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Aug 21 18:50:01 +0000 2022
>Originator:     Hauke Fath
>Release:        NetBSD 9.2_STABLE
System: NetBSD Smallpad 9.2_STABLE NetBSD 9.2_STABLE (X61) #9: Sat Jul 30 15:53:30 CEST 2022 hauke@pizza:/var/obj/netbsd-build-objects/9/amd64/sys/arch/amd64/compile/X61 amd64
Architecture: x86_64
Machine: amd64

	Invoking 'amq -i', to obtain information about amd(8) mount
	maps, SIGSEVs on both netbsd-9 and -current.


	Set up amd(8) on a system, then run 'amq -i'.

[hauke@Smallpad] /<5>bsd/am-utils > gdb bin/amq/amq
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Reading symbols from bin/amq/amq...
(gdb) set args -i
(gdb) run
Starting program: /local/source/netbsd-9/src/external/bsd/am-utils/bin/amq/amq -i
Name               Wild                                          Flags    Refcnt  Entries Reloads Stat Modified

Program received signal SIGSEGV, Segmentation fault.
0x00000001c7c023a0 in time_print (tt=0x61e410ff) at /local/source/netbsd-9/src/external/bsd/am-utils/dist/amq/amq.c:84
84        time_t t = (time_t)*tt;
(gdb) bt
#0  0x00000001c7c023a0 in time_print (tt=0x61e410ff) at /local/source/netbsd-9/src/external/bsd/am-utils/dist/amq/amq.c:84
#1  0x00000001c7c02dd7 in show_mapinfo (ml=0x1c7e05290 <res>, e=Full, nwid=0x7f7fff9421f4, wwid=0x7f7fff9421f0)
    at /local/source/netbsd-9/src/external/bsd/am-utils/dist/amq/amq.c:294
#2  0x00000001c7c0399d in main (argc=2, argv=0x7f7fff942388) at /local/source/netbsd-9/src/external/bsd/am-utils/dist/amq/amq.c:727
(gdb) frame 1
#1  0x00000001c7c02dd7 in show_mapinfo (ml=0x1c7e05290 <res>, e=Full, nwid=0x7f7fff9421f4, wwid=0x7f7fff9421f0)
    at /local/source/netbsd-9/src/external/bsd/am-utils/dist/amq/amq.c:294
294             time_print(mi->mi_modify);
(gdb) print mi->mi_modify
$1 = (time_type) 0x61e410ff
(gdb) print *mi->mi_modify
Cannot access memory at address 0x61e410ff

	The mi_modify field is set in amq_xdr.c::xdr_amq_map_info(),
	and that's about my current level of understanding.


	Yes, please.



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