Date: Tue, 16 Jun 2020 20:23:37 -0700 From: Mark Millard <marklmi@yahoo.com> To: Justin Hibbits <chmeeedalf@gmail.com> Cc: FreeBSD PowerPC ML <freebsd-ppc@freebsd.org>, Brandon Bergren <bdragon@FreeBSD.org> Subject: Re: svn commit: r360233 - in head: contrib/jemalloc . . . : This partially breaks a 2-socket 32-bit powerpc (old PowerMac G4) based on head -r360311 Message-ID: <E1B78D50-D62E-43A1-9360-8C9F4B32A50F@yahoo.com> In-Reply-To: <20200616213205.05f365dd@titan.knownspace> References: <C24EE1A1-FAED-42C2-8204-CA7B1D20A369@yahoo.com> <18E62746-80DB-4195-977D-4FF32D0129EE@yahoo.com> <F5953A6B-56CE-4D1C-8C18-58D44B639881@yahoo.com> <D0C483E5-3F6A-4816-A6BA-3D2C82C24F8E@yahoo.com> <C440956F-139E-4EF7-A68E-FE35D9934BD3@yahoo.com> <9562EEE4-62EF-4164-91C0-948CC0432984@yahoo.com> <9B68839B-AEC8-43EE-B3B6-B696A4A57DAE@yahoo.com> <359C9C7D-4106-42B5-AAB5-08EF995B8100@yahoo.com> <20200513105632.06db9e21@titan.knownspace> <B1225914-43BC-44EF-A73E-D06B890229C6@yahoo.com> <20200611155545.55526f7c@ralga.knownspace> <5542B85D-1C3A-41D8-98CE-3C02E990C3EB@yahoo.com> <20200611164216.47f82775@ralga.knownspace> <DEA9A860-5DEE-49EE-97F1-DBDB39D5C0A3@yahoo.com> <DCB0BC72-1666-49F3-A838-B2A0D653A0C2@yahoo.com> <20200611212532.59f677be@ralga.knownspace> <1EDCA498-0B67-4374-B7CA-1ECDA8EE32AD@yahoo.com> <3605089E-7B5D-4FBA-B0D1-14B789BDF09B@yahoo.com> <CE56E7B6-7189-41BD-9384-6E492FEA85F3@yahoo.com> <F27CB198-2169-4FB2-AA67-F8244C7D39C5@yahoo.com> <20200616213205.05f365dd@titan.knownspace>
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On 2020-Jun-16, at 19:32, Justin Hibbits <chmeeedalf@gmail.com> wrote:
> (Removing hackers and current, too many cross-lists already, and those
> interested in reading this are probably already on ppc@)
>=20
> Mark,
>=20
> Can you try this updated patch? Again, I've only compiled it, I
> haven't tested it, so it may also explode. However, it more closely
> mimics exactly what moea64 does.
Sure . . . But no luck.
Same crash, same backtrace related information,
other than the "in page" figure and the "time"
figure:
panic: vm_page_free_prep: mapping flags set in page 0xd0300fc0
cpuid =3D 0
time =3D 1592362496
KDB: stack backtrace:
0xd2dc4340: at kdb_backtrace+0x64
0xd2dc43a0: at vpanic+0x208
0xd2dc4410: at panic+0x64
0xd2dc4450: at vm_page_free_prep+0x348
0xd2dc4470: at vm_page_free_toq+0x3c
0xd2dc4490: at vm_page_free+0x20
0xd2dc44a0: at vm_object_collapse+0x4ac
0xd2dc4510: at vm_object_deallocate+0x430
0xd2dc4550: at vm_map_process_deferred+0xec
0xd2dc4570: at vm_map_remove+0x12c
0xd2dc4590: at exec_new_vmspace+0x20c
0xd2dc45f0: at exec_elf32_imgact+0xa70
0xd2dc46a0: at kern_execve+0x600
0xd2dc4910: at sys_execve+0x84
0xd2dc4970: at trap+0x748
0xd2dc4a10: at powerpc_interrupt+0x178
0xd2dc4a40: user SC trap by 0x100d71f8: srr1=3D0xf032
r1=3D0xffffd810 cr=3D0x82000280 xer=3D0 ctr=3D0x10173810 =
frame=3D0xd2dc4a48
KDB: enter: panic
/wrkdirs/usr/ports/devel/gdb/work-py37/gdb-9.1/gdb/inferior.c:283: =
internal-error: struct inferior *find_inferior_pid(int): Assertion `pid =
!=3D 0' failed.
FYI . . .
(m->a.flags & (PGA_EXECUTABLE | PGA_WRITEABLE)) =3D=3D 0
is failing when (m->oflags & VPO_UNMANAGED) =3D=3D 0 holds in
vm_page_free_prep. See the last KASSERT in the code
quoted below. Does this suggest the lack of someplace
not clearing some flags in m->a.flags that should be
doing so?
static bool
vm_page_free_prep(vm_page_t m)
{
=20
/*
* Synchronize with threads that have dropped a reference to =
this
* page.
*/
atomic_thread_fence_acq();
=20
#if defined(DIAGNOSTIC) && defined(PHYS_TO_DMAP)
if (PMAP_HAS_DMAP && (m->flags & PG_ZERO) !=3D 0) {
uint64_t *p;
int i;
p =3D (uint64_t *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(m));
for (i =3D 0; i < PAGE_SIZE / sizeof(uint64_t); i++, =
p++)
KASSERT(*p =3D=3D 0, ("vm_page_free_prep %p =
PG_ZERO %d %jx",
m, i, (uintmax_t)*p));
}
#endif
if ((m->oflags & VPO_UNMANAGED) =3D=3D 0) {
KASSERT(!pmap_page_is_mapped(m),
("vm_page_free_prep: freeing mapped page %p", m));
KASSERT((m->a.flags & (PGA_EXECUTABLE | PGA_WRITEABLE)) =
=3D=3D 0,
("vm_page_free_prep: mapping flags set in page %p", =
m));
} else {
. . .
=3D=3D=3D
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)
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