Hi,
One of my i386 test machines crashed during make build. Kernel is
GENERIC.MP built from current sources.
panic: uvm_fault(0xd59b2424, 0xcf800000, 0, 1) -> e
Stopped at db_enter+0x4: popl %ebp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*435945 40779 21 0x2 0 5 llvm-tblgen
212835 13904 21 0x2 0 3 llvm-tblgen
150086 44694 21 0x2 0 11 llvm-tblgen
332575 10539 21 0x2 0 10 llvm-tblgen
385473 77182 21 0x2 0 8 llvm-tblgen
104320 19436 0 0x14000 0x200 1 aiodoned
db_enter() at db_enter+0x4
panic(d0cbc6b7) at panic+0x7a
kpageflttrap(f86b5c94,cf800000) at kpageflttrap+0x133
trap(f86b5c94) at trap+0x255
calltrap() at calltrap+0xc
pmap_remove_ptes_pae(d0f6fda0,0,cf800000,0,1000,0,f86b5d1c) at
pmap_remove_ptes_pae+0x4f
pmap_do_remove_pae(d0f6fda0,0,1000,0) at pmap_do_remove_pae+0x120
pmap_remove(d0f6fda0,0,1000) at pmap_remove+0x18
uvm_pagermapout(0,1) at uvm_pagermapout+0x1a
uvn_io(d655b5b4,f86b5de8,1,202,0) at uvn_io+0x289
uvn_get(d655b5b4,4e000,0,f86b5e40,f86b5e3c,0,1,0) at uvn_get+0x16d
uvm_fault_lower_io(f86b5ee0,f86b5eb4,f86b5e84,f86b5e80) at
uvm_fault_lower_io+0x221
uvm_fault_lower(f86b5ee0,f86b5eb4,f86b5efc) at uvm_fault_lower+0x283
uvm_fault(d59b2424,44e000,0,1) at uvm_fault+0x1a1
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports. Insufficient info makes it difficult to find and fix bugs.
ddb{5}> x/s version
version: OpenBSD 7.7-current (GENERIC.MP) #0: Thu Aug 28 23:09:35 CEST
2025\012
[email protected]:/usr/src/sys/arch/i386/compile/GENERIC.MP\012
ddb{5}> show panic
*cpu5: uvm_fault(0xd59b2424, 0xcf800000, 0, 1) -> e
ddb{5}> trace
db_enter() at db_enter+0x4
panic(d0cbc6b7) at panic+0x7a
kpageflttrap(f86b5c94,cf800000) at kpageflttrap+0x133
trap(f86b5c94) at trap+0x255
calltrap() at calltrap+0xc
pmap_remove_ptes_pae(d0f6fda0,0,cf800000,0,1000,0,f86b5d1c) at
pmap_remove_ptes_pae+0x4f
pmap_do_remove_pae(d0f6fda0,0,1000,0) at pmap_do_remove_pae+0x120
pmap_remove(d0f6fda0,0,1000) at pmap_remove+0x18
uvm_pagermapout(0,1) at uvm_pagermapout+0x1a
uvn_io(d655b5b4,f86b5de8,1,202,0) at uvn_io+0x289
uvn_get(d655b5b4,4e000,0,f86b5e40,f86b5e3c,0,1,0) at uvn_get+0x16d
uvm_fault_lower_io(f86b5ee0,f86b5eb4,f86b5e84,f86b5e80) at
uvm_fault_lower_io+0x221
uvm_fault_lower(f86b5ee0,f86b5eb4,f86b5efc) at uvm_fault_lower+0x283
uvm_fault(d59b2424,44e000,0,1) at uvm_fault+0x1a1
upageflttrap(f86b5ff0,44ea0d) at upageflttrap+0x55
trap(f86b5ff0) at trap+0x1e9
calltrap() at calltrap+0xc
end of kernel
ddb{5}> show register
ds 0x10
es 0x10
fs 0x20
gs 0
edi 0xd0cbc6b7 gen12_xcs_offsets+0xf1e8
esi 0
ebp 0xf86b5c0c
ebx 0xf654f618
edx 0x10
ecx 0xa83af42b
eax 0x34
eip 0xd041c974 db_enter+0x4
cs 0x8
eflags 0x202
esp 0xf86b5c0c
ss 0x10
db_enter+0x4: popl %ebp
ddb{5}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
*40779 435945 23897 21 7 0x2 llvm-tblgen
23897 138229 57914 21 3 0x10008a sigsusp sh
49931 369222 57914 21 3 0x2 biowait llvm-tblgen
38357 6862 57914 21 3 0x2 flt_pmfail1 llvm-tblgen
32101 460407 9912 21 3 0x2 flt_pmfail1 llvm-tblgen
756 422844 57914 21 3 0x2 flt_noram3 llvm-tblgen
13904 212835 57914 21 7 0x2 llvm-tblgen
69850 77517 57914 21 3 0x2 flt_noram1 llvm-tblgen
27460 162562 57914 21 3 0x2 biowait llvm-tblgen
44694 150086 57914 21 7 0x2 llvm-tblgen
24447 263270 57914 21 3 0x2 flt_pmfail1 llvm-tblgen
9912 283403 57914 21 3 0x10008a sigsusp sh
10539 332575 57914 21 7 0x2 llvm-tblgen
77182 385473 57914 21 7 0x2 llvm-tblgen
99319 384756 57914 21 3 0x2 biowait llvm-tblgen
57914 20160 25644 21 3 0x10008a sigsusp make
25644 438306 89227 21 3 0x10008a sigsusp sh
89227 126930 20598 21 3 0x10008a sigsusp make
20598 83226 45856 21 3 0x10008a sigsusp sh
45856 95319 508 21 3 0x10008a sigsusp make
508 515009 8199 21 3 0x10008a sigsusp sh
8199 521600 50234 21 3 0x10008a sigsusp make
50234 308362 79552 21 3 0x10008a sigsusp sh
79552 277314 18529 21 3 0x10008a sigsusp make
18529 406475 52080 0 3 0x10008a sigsusp sh
52080 388122 97675 0 3 0x10008a sigsusp make
97675 389755 63098 0 3 0x10008a sigsusp make
63098 420707 83275 0 3 0x10008a sigsusp ksh
83275 318844 44263 0 3 0x98 kqread sshd-session
44263 187234 11977 0 3 0x92 kqread sshd-session
42159 283177 1 0 3 0x100080 sbwait nonxt-reflect
98501 362680 1 0 3 0x100080 sbwait nonxt-reflect
87574 17810 1 0 3 0x100080 sbwait nonxt-reflect
53851 466456 1 0 3 0x100080 sbwait nonxt-reflect
34512 263570 1 0 3 0x100080 sbwait nonxt-reflect
3236 23468 1 0 3 0x100080 sbwait nonxt-reflect
4691 182606 1 0 3 0x100080 sbwait nonxt-reflect
60428 462552 1 0 3 0x100080 sbwait nonxt-reflect
31133 127314 1 0 3 0x100080 sbwait nonxt-reflect
58086 438079 1 0 3 0x100080 sbwait nonxt-reflect
59196 207657 1 0 3 0x100080 sbwait nonxt-reflect
31569 221372 1 0 3 0x100080 sbwait nonxt-reflect
60078 510051 1 0 3 0x100080 sbwait nonxt-reflect
18126 216430 1 0 3 0x100080 sbwait nonxt-reflect
56562 400324 1 0 3 0x100080 sbwait nonxt-reflect
12636 119878 1 0 3 0x100080 sbwait nonxt-reflect
45572 441128 1 0 3 0x100080 sbwait nonxt-reflect
98692 251547 1 0 3 0x100080 sbwait nonxt-reflect
39639 82843 1 0 3 0x100080 sbwait nonxt-reflect
45143 240736 1 0 3 0x100080 sbwait nonxt-reflect
29376 326811 1 0 3 0x100083 ttyin getty
12496 268639 1 0 3 0x100083 ttyin getty
56108 205644 1 0 3 0x100083 ttyin getty
76205 314878 1 0 3 0x100083 ttyin getty
64883 66456 1 0 3 0x100083 ttyin getty
13267 414032 1 0 3 0x100083 ttyin getty
66082 58473 1 0 3 0x100098 kqread cron
979 469547 1 99 3 0x1100090 kqread sndiod
37224 45166 1 110 3 0x100090 kqread sndiod
1699 508507 1 0 3 0x100090 kqread inetd
32334 119708 49761 95 3 0x1100092 kqread smtpd
30066 319295 49761 103 3 0x1100092 kqread smtpd
67930 412470 49761 95 3 0x1100092 kqread smtpd
38316 51104 49761 95 3 0x100092 kqread smtpd
15445 172316 49761 95 3 0x1100092 kqread smtpd
29803 57293 49761 95 3 0x1100092 kqread smtpd
49761 170728 1 0 3 0x100080 kqread smtpd
65427 125797 7088 91 3 0x92 kqread snmpd_metrics
33807 237916 7088 91 3 0x1100092 kqread snmpd
7088 314858 1 0 3 0x100080 kqread snmpd
11977 391166 1 0 3 0x88 kqread sshd
81560 144544 0 0 3 0x14280 nfsidl nfsio
21235 235053 0 0 3 0x14280 nfsidl nfsio
41069 502268 0 0 3 0x14280 nfsidl nfsio
9696 32546 0 0 3 0x14280 nfsidl nfsio
37310 340373 1 0 3 0x100080 kqread ntpd
15526 180301 17877 83 3 0x100092 kqread ntpd
17877 16264 1 83 3 0x1100092 kqread ntpd
38842 364068 40769 73 3 0x1100090 kqread syslogd
40769 7485 1 0 3 0x100082 sbwait syslogd
20703 192686 94038 77 3 0x100092 kqread dhcpleased
52744 11081 94038 77 3 0x100092 kqread dhcpleased
94038 201224 1 0 3 0x80 kqread dhcpleased
18957 15911 55690 115 3 0x100092 kqread slaacd
34057 360563 55690 115 3 0x100092 kqread slaacd
55690 212231 1 0 3 0x100080 kqread slaacd
3259 201082 0 0 3 0x14200 bored smr
78185 495270 0 0 3 0x14200 pgzero zerothread
19436 104320 0 0 7 0x14200 aiodoned
3799 200317 0 0 3 0x14200 syncer update
82810 143382 0 0 3 0x14200 cleaner cleaner
71366 112767 0 0 3 0x14200 reaper reaper
81657 266197 0 0 3 0x14200 oom pagedaemon
58838 404398 0 0 3 0x14200 bored wsdisplay0
96573 343657 0 0 3 0x14200 usbtsk usbtask
78921 150982 0 0 3 0x14200 usbatsk usbatsk
35559 168356 0 0 3 0x14200 bored sensors
10278 273080 0 0 3 0x40014200 acpi0 acpi0
76715 268449 0 0 3 0x40014200 idle11
53940 130888 0 0 3 0x40014200 idle10
83736 220735 0 0 7 0x40014200 idle9
92316 378080 0 0 3 0x40014200 idle8
81561 469392 0 0 7 0x40014200 idle7
61983 171632 0 0 7 0x40014200 idle6
89495 231645 0 0 3 0x40014200 idle5
82249 218984 0 0 7 0x40014200 idle4
16639 172584 0 0 3 0x40014200 idle3
83238 353066 0 0 7 0x40014200 idle2
48908 439575 0 0 3 0x40014200 idle1
93383 34611 0 0 3 0x14200 bored softnet7
57507 510162 0 0 3 0x14200 bored softnet6
97429 515255 0 0 3 0x14200 bored softnet5
425 242474 0 0 3 0x14200 bored softnet4
271 189633 0 0 3 0x14200 bored softnet3
61916 381610 0 0 3 0x14200 bored softnet2
55504 51393 0 0 3 0x14200 bored softnet1
68091 47725 0 0 3 0x14200 bored softnet0
761 297576 0 0 3 0x14200 bored systqmp
39354 185730 0 0 3 0x14200 bored systq
99394 433067 0 0 3 0x14200 tmoslp softclockmp
47009 235670 0 0 3 0x40014200 tmoslp softclock
44996 301820 0 0 7 0x40014200 idle0
31097 447468 0 0 3 0x14200 kmalloc kmthread
1 362302 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{5}> show uvm
Current UVM status:
pagesize=4096 (0x1000), pagemask=0xfff, pageshift=12
765702 VM pages: 457558 active, 219745 inactive, 1 wired, 5 free (4 zero)
freemin=25523, free-target=34030, inactive-target=225690, wired-max=255234
faults=158583215, traps=160380218, intrs=3521274, ctxswitch=45698214
fpuswitch=378748
softint=6919460, syscalls=184223423, kmapent=13
fault counts:
noram=193025, noanon=0, noamap=0, pgwait=0, pgrele=0
relocks=437348(5254), upgrades=0(0) anget(retries)=84112012(55721),
amapcopy=8611362
neighbor anon/obj pg=6070098/112857440, gets(lock/unlock)=39637959/389216
cases: anon=82202014, anoncow=1909994, obj=38738890, prcopy=891480,
przero=34840850
daemon and swap counts:
woke=24835, revs=24829, scans=6541847, obscans=129078, anscans=5170920
busy=0, freed=982448, reactivate=1241740, deactivate=2743741
pageouts=178607, pending=55260, nswget=42090
nswapdev=1
swpages=849685, swpginuse=829724, swpgonly=811492 paging=11
kernel pointers:
objs(kern)=0xd0fb8804
ddb{5}> x/i pmap_remove_ptes_pae+4f
pmap_remove_ptes_pae+0x4f: movl 0(%edi),%eax
/usr/src/sys/arch/i386/i386/pmapae.c:1158
2cd9: 39 d6 cmp %edx,%esi
2cdb: 0f 83 c7 00 00 00 jae 2da8 <pmap_remove_ptes_pae+0x108>
2ce1: 85 c9 test %ecx,%ecx
2ce3: 74 0a je 2cef <pmap_remove_ptes_pae+0x4f>
2ce5: 83 79 30 02 cmpl $0x2,0x30(%ecx)
2ce9: 0f 82 b9 00 00 00 jb 2da8 <pmap_remove_ptes_pae+0x108>
/usr/src/sys/arch/i386/i386/pmapae.c:1160
* 2cef: 8b 07 mov (%edi),%eax
2cf1: a8 01 test $0x1,%al
2cf3: 74 db je 2cd0 <pmap_remove_ptes_pae+0x30>
2cf5: c1 e8 09 shr $0x9,%eax
2cf8: 23 45 1c and 0x1c(%ebp),%eax
/usr/src/sys/arch/i386/i386/pmapae.c:1163
1158 for (/*null*/; startva < endva && (ptp == NULL ||
ptp->wire_count > 1)
1159 ; pte++, startva += NBPG) {
* 1160 if (!pmap_valid_entry(*pte))
1161 continue; /* VA not
mapped */
1162
1163 if ((flags & PMAP_REMOVE_SKIPWIRED) && (*pte & PG_W))
1164 continue;
ddb{5}> show struct pmap 0xd0f6fda0
struct pmap at 0xd0f6fda0 (164 bytes) {pm_pdidx =
[19279873,19283969,19288065,19292161], pm_pdidx_intel =
[77713409,77717505,77721601,77725697], pm_mtx = {mtx_owner = (void *)0x0,
mtx_wantipl = 128, mtx_oldipl = 0}, pm_apte_mtx = {mtx_owner = (void *)0x0,
mtx_wantipl = 144, mtx_oldipl = 144}, pm_pdirpa = 16186784, pm_pdirpa_intel =
16186816, pm_pdir = 3508940800, pm_pdir_intel = 4132618240, pm_pdirsize =
16384, pm_obj = {vmobjlock = (struct rwlock *)0x0, pgops = (const uvm_pagerops
*)0xd0d787ac, memt = {rbh_root = {rbt_root = (struct rb_entry *)0xd4c58f84}},
uo_npages = 523, uo_refs = 5}, pm_list = {le_next = (struct pmap *)0x0, le_prev
= 0x0}, pm_ptphint = (struct vm_page *)0xd4c585fc, pm_stats = {resident_count =
5646, wired_count = 5140}, pm_hiexec = 0, pm_flags = 0, pm_codeseg =
{sd_lolimit = 0, sd_lobase = 0, sd_type = 0, sd_dpl = 0, sd_p = 0, sd_hilimit =
0, sd_xx = 0, sd_def32 = 0, sd_gran = 0, sd_hibase = 0}}
bluhm
