panic: kernel diagnostic assertion "(pg->pg_flags & (PQ_INACTIVE|PQ_ACTIVE)) == NUM" failed: file "/syzkaller/managers/s
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syzbot
Dec 10, 2025, 5:27:27 PM (yesterday) Dec 10
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: d004c0aeba6f Update show rib mem stats now that we have pe..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=14ed1a1a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=c1461974b88117f479c9
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ca88e5805262/disk-d004c0ae.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/35132e341690/bsd-d004c0ae.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a8694f8c2c36/kernel-d004c0ae.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c14619...@syzkaller.appspotmail.com
login: panic: kernel diagnostic assertion "(pg->pgW_ARfNlaINgGs: &S P(L NPQ_OT LOWERED ON SYSCALL 91 -703008456 EXIT 0 a
Stopped at savectx+0xae: movl $0,%gs:0x688
TID PID UID PRFLAGS PFLAGS CPU COMMAND
43370 7889 32767 0x10 0x4000000 0 syz-executor
* 15280 7931 32767 0x10 0 1 syz-executor
savectx() at savectx+0xae
end of kernel
end trace frame: 0x797dd618f120, count: 14
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{1}>
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
*cpu0: kernel diagnostic assertion "(pg->pg_flags & (PQ_INACTIVE|PQ_ACTIVE)) == 0" failed: file "/syzkaller/managers/setuid/kernel/sys/uvm/uvm_page.c", line 1309
ddb{1}> trace
savectx() at savectx+0xae
end of kernel
end trace frame: 0x797dd618f120, count: -1
ddb{1}> show registers
rdi 0
rsi 0
rbp 0xffff800035fddf10
rbx 0
rdx 0
rcx 0xffff8000fffee548
rax 0x3b
r8 0xffff800035fdde40
r9 0x1
r10 0xe5f88f609d58c19e
r11 0xea7c0d5b90bd70b3
r12 0
r13 0
r14 0xffff8000fffee548
r15 0
rip 0xffffffff812673ee savectx+0xae
cs 0x8
rflags 0x46
rsp 0xffff800035fdde90
ss 0x10
savectx+0xae: movl $0,%gs:0x688
ddb{1}> show proc
PROC (syz-executor) tid=15280 pid=7931 tcnt=1 stat=onproc
flags process=10<SUGID> proc=0
runpri=32, usrpri=50, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff8000fffee018,0xffff8000393f94f0
process=0xffff800032bbc4e8 user=0xffff800035fd8000, vmspace=0xfffffd806ce01208
estcpu=36, cpticks=8, pctcpu=0.1, user=0, sys=8, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
7889 169348 49570 32767 2 0x10 syz-executor
7889 43370 49570 32767 7 0x4000010 syz-executor
27646 280616 7931 32767 3 0x90 nanoslp syz-executor
27646 162315 7931 32767 3 0x4000090 msgwait syz-executor
31833 324315 85434 32767 2 0xc90 syz-executor
31833 247231 85434 32767 3 0x4000090 kqsel syz-executor
31833 233349 85434 32767 3 0x4000090 fsleep syz-executor
19255 63148 4768 0 3 0x82 sbwait sshd-session
79073 134555 94370 32767 2 0xc90 syz-executor
79073 336384 94370 32767 3 0x4000090 netacc syz-executor
79073 345 94370 32767 3 0x4000090 fsleep syz-executor
94370 257125 95516 32767 3 0x90 nanoslp syz-executor
49570 81151 54002 32767 2 0xc90 syz-executor
69392 189152 1217 32767 2 0xc90 syz-executor
* 7931 15280 87267 32767 7 0x10 syz-executor
67288 227042 13587 32767 3 0x90 wait syz-executor
85434 392866 49921 32767 3 0x90 nanoslp syz-executor
33202 482365 70604 32767 3 0x90 nanoslp syz-executor
7571 368004 45371 32767 3 0x90 nanoslp syz-executor
45371 254766 6921 0 3 0x82 wait syz-executor
13587 458303 6921 0 3 0x82 wait syz-executor
49921 420204 6921 0 3 0x82 wait syz-executor
1217 29 6921 0 3 0x82 wait syz-executor
70604 478449 6921 0 3 0x82 wait syz-executor
54002 360890 6921 0 3 0x82 wait syz-executor
87267 42585 6921 0 3 0x82 wait syz-executor
95516 432222 6921 0 3 0x82 wait syz-executor
6921 297975 65863 0 3 0x82 kqread syz-executor
65863 33617 99506 0 3 0x10008a sigsusp ksh
99506 357696 81177 0 3 0x98 kqread sshd-session
81177 194842 4768 0 3 0x92 kqread sshd-session
49904 399897 1 0 3 0x100083 ttyin getty
4768 157017 1 0 3 0x88 kqread sshd
73013 304449 51116 73 3 0x1100090 kqread syslogd
51116 44095 1 0 3 0x100082 sbwait syslogd
16052 232093 1 0 3 0x100080 kqread resolvd
9966 2495 58002 77 3 0x100092 kqread dhcpleased
28363 461317 58002 77 3 0x100092 kqread dhcpleased
58002 5446 1 0 3 0x80 kqread dhcpleased
38218 201003 0 0 3 0x14200 bored smr
96823 120421 0 0 2 0x14200 zerothread
33795 304207 0 0 3 0x14200 aiodoned aiodoned
2189 258765 0 0 3 0x14200 syncer update
59683 55851 0 0 3 0x14200 cleaner cleaner
11934 364047 0 0 2 0x14200 reaper
23164 328139 0 0 3 0x14200 pgdaemon pagedaemon
41572 339796 0 0 3 0x14200 bored viomb
55958 103651 0 0 3 0x40014200 acpi0 acpi0
42793 358867 0 0 3 0x40014200 idle1
79863 424426 0 0 3 0x14200 bored softnet1
46556 504340 0 0 3 0x14200 bored softnet0
38686 412487 0 0 3 0x14200 bored systqmp
90749 410451 0 0 3 0x14200 bored systq
17502 2575 0 0 3 0x14200 tmoslp softclockmp
42963 211780 0 0 3 0x40014200 tmoslp softclock
51076 505826 0 0 3 0x40014200 idle0
1 391470 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
CPU 1:
exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff838d7ec8)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:311
#2 mtx_enter+0x62 sys/kern/kern_lock.c:261
#3 uvm_pmr_freepages+0x1a8 sys/uvm/uvm_pmemrange.c:-1
#4 uvm_anfree_list+0x1e5 sys/uvm/uvm_anon.c:129
#5 amap_wipeout+0x248 sys/uvm/uvm_amap.c:-1
#6 uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353
#7 uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525
#8 exit1+0x6fc sys/kern/kern_exit.c:260
#9 sys_exit+0x1a sys/kern/kern_exit.c:-1
#10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775
#11 Xsyscall+0x128
Process 7889 (syz-executor) thread 0xffff80003a8134e8 (43370)
shared rwlock amaplk r = 0 (0xfffffd8079790700)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413
#2 uvm_fault_check+0x8a9 sys/uvm/uvm_fault.c:834
#3 uvm_fault+0x106 sys/uvm/uvm_fault.c:627
#4 kpageflttrap+0x2f4 sys/arch/amd64/amd64/trap.c:283
#5 kerntrap+0x19c sys/arch/amd64/amd64/trap.c:520
#6 alltraps_kern_meltdown+0x7b
#7 _copyin+0x5b
#8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
#9 Xsyscall+0x128
shared rwlock vmmaplk r = 0 (0xfffffd806cc83e80)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413
#2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880
#3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693
#4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627
#5 kpageflttrap+0x2f4 sys/arch/amd64/amd64/trap.c:283
#6 kerntrap+0x19c sys/arch/amd64/amd64/trap.c:520
#7 alltraps_kern_meltdown+0x7b
#8 _copyin+0x5b
#9 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#9 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
#10 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10216 10961K 10973K 166960K 11309 0
pcb 17 12K 12K 166960K 17 0
rtable 243 6K 7K 166960K 363 0
pf 31 16K 16K 166960K 31 0
ifaddr 42 7K 7K 166960K 44 0
ifgroup 50 2K 2K 166960K 50 0
sysctl 1 1K 9K 166960K 6 0
counters 70 37K 37K 166960K 70 0
ioctlops 0 0K 2K 166960K 67 0
iov 0 0K 16K 166960K 14 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1336 84K 84K 166960K 1462 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 8 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 1K 166960K 23 0
dirhash 12 2K 2K 166960K 18 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 25 93K 125K 166960K 335 0
sigio 0 0K 0K 166960K 7 0
proc 58 99K 147K 166960K 497 0
subproc 72 4K 4K 166960K 72 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 35 0
in_multi 99 7K 7K 166960K 104 0
ether_multi 1 0K 0K 166960K 1 0
mrt 1 0K 0K 166960K 1 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 229 1023K 1023K 166960K 229 0
exec 0 0K 1K 166960K 365 0
fusefs mount 1 32K 32K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 269 169K 174K 166960K 4932 0
UVM aobj 13 6K 6K 166960K 13 0
pinsyscall 48 96K 116K 166960K 1381 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 2 0K 0K 166960K 16 0
NDP 11 0K 2K 166960K 27 0
temp 45 8672K 8737K 166960K 4561 0
kqueue 14 22K 25K 166960K 60 0
SYN cache 2 16K 16K 166960K 2 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 26 0 0 1 0 1 1 0 8 0
rtpcb 120 55 0 52 1 0 1 1 0 8 0
rtentry 176 114 0 1 6 0 6 6 0 8 0
unpcb 144 232 0 212 4 0 4 4 0 8 2
syncache 336 6 0 6 1 0 1 1 0 8 1
tcpcb 736 197 0 189 7 0 7 7 0 8 6
arp 136 18 0 0 1 0 1 1 0 8 0
ipq 40 2 0 1 1 0 1 1 0 8 0
ipqe 40 5 0 3 1 0 1 1 0 8 0
inpcb 328 507 0 494 7 0 7 7 0 8 5
ip6q 72 1 0 0 1 0 1 1 0 8 0
ip6af 40 1 0 0 1 0 1 1 0 8 0
nd6 152 27 0 0 2 0 2 2 0 8 0
kcovpl 48 8 0 0 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 486 0 0 31 0 31 31 0 8 0
art_table 40 487 0 0 5 0 5 5 0 8 0
art_node 32 114 0 11 1 0 1 1 0 8 0
sysvmsgpl 40 8 0 2 1 0 1 1 0 8 0
semapl 112 18 0 8 1 0 1 1 0 8 0
shmpl 112 10 0 0 1 0 1 1 0 8 0
dirhash 1024 21 0 4 3 0 3 3 0 8 0
dino2pl 256 1923 0 413 95 0 95 95 0 8 0
ffsino 296 1923 0 413 117 0 117 117 0 8 0
nchpl 144 2441 0 750 63 0 63 63 0 8 0
vnodes 216 2004 0 0 112 0 112 112 0 8 0
namei 1024 7764 0 7764 1 0 1 1 0 8 1
percpumem 16 50 0 0 1 0 1 1 0 8 0
kstatmem 264 24 0 0 2 0 2 2 0 8 0
scxspl 216 7631 0 7631 3 1 2 2 1 8 2
plimitpl 152 68 0 41 2 0 2 2 0 8 0
sigapl 424 617 0 562 7 0 7 7 0 8 0
knotepl 120 309 0 0 10 0 10 10 0 8 0
kqueuepl 224 63 0 52 1 0 1 1 0 8 0
pipepl 344 127 0 100 3 0 3 3 0 8 0
fdescpl 528 601 0 563 4 0 4 4 0 8 1
filepl 160 3272 0 3037 14 0 14 14 0 8 3
lockfpl 104 46 0 43 1 0 1 1 0 8 0
lockfspl 48 21 0 18 1 0 1 1 0 8 0
sessionpl 144 22 0 5 1 0 1 1 0 8 0
pgrppl 48 36 0 11 1 0 1 1 0 8 0
ucredpl 104 738 0 719 1 0 1 1 0 8 0
zombiepl 144 566 0 562 1 0 1 1 0 8 0
processpl 1232 617 0 562 5 0 5 5 0 8 0
procpl 664 982 0 921 7 0 7 7 0 8 0
sosppl 176 1 0 1 1 0 1 1 0 8 1
sockpl 752 800 0 763 12 0 12 12 0 8 7
mcl64k 65536 4 0 0 1 0 1 1 0 8 0
mcl16k 16384 3 0 0 1 0 1 1 0 8 0
mcl8k 8192 1 0 0 1 0 1 1 0 8 0
mcl4k 4096 117 0 0 15 0 15 15 0 8 0
mcl2k 2048 24 0 0 3 0 3 3 0 8 0
mtagpl 96 3 0 0 1 0 1 1 0 8 0
mbufpl 256 267 0 0 17 0 17 17 0 8 0
bufpl 280 2729 0 118 187 0 187 187 0 8 0
anonpl 32 10274 0 0 83 0 83 83 0 246 0
amapchunkpl 152 15615 0 14922 34 0 34 34 0 158 5
amappl16 200 2632 0 2607 14 3 11 14 0 8 8
amappl15 192 9 0 9 1 1 0 1 0 8 0
amappl14 184 6 0 6 1 1 0 1 0 8 0
amappl13 176 399 0 398 1 0 1 1 0 8 0
amappl12 168 935 0 887 3 0 3 3 0 8 0
amappl11 160 5 0 4 1 0 1 1 0 8 0
amappl10 152 76 0 66 1 0 1 1 0 8 0
amappl9 144 250 0 250 1 1 0 1 0 8 0
amappl8 136 21 0 20 1 0 1 1 0 8 0
amappl7 128 77 0 76 1 0 1 1 0 8 0
amappl6 120 279 0 267 1 0 1 1 0 8 0
amappl5 112 83 0 74 1 0 1 1 0 8 0
amappl4 104 368 0 343 1 0 1 1 0 8 0
amappl3 96 2607 0 2479 4 0 4 4 0 8 0
amappl2 88 491 0 432 2 0 2 2 0 8 0
amappl1 80 9643 0 8988 15 1 14 15 0 8 0
amappl 88 4214 0 4022 5 0 5 5 0 92 0
uvmvnodes 80 109 0 0 3 0 3 3 0 8 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma1024 1024 1 0 0 1 0 1 1 0 8 0
dma256 256 6 0 6 1 1 0 1 0 8 0
dma128 128 253 0 253 1 1 0 1 0 8 0
dma64 64 6 0 6 1 1 0 1 0 8 0
dma32 32 7 0 7 1 1 0 1 0 8 0
dma16 16 18 0 17 1 0 1 1 0 8 0
aobjpl 72 12 0 0 1 0 1 1 0 8 0
uaddrrnd 24 601 0 563 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 601 0 563 1 0 1 1 0 8 0
vmmpekpl 168 6607 0 6576 2 0 2 2 0 8 0
vmmpepl 168 45999 0 43798 103 0 103 103 0 357 4
vmsppl 488 600 0 562 7 1 6 6 0 8 1
rwobjpl 80 15952 0 14888 25 0 25 25 0 8 2
pdppl 4096 1210 0 1124 108 22 86 98 0 8 0
pvpl 32 19737 0 0 160 0 160 160 0 265 0
pmappl 256 600 0 562 4 1 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 292 0 25 8 0 8 8 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffffffff83895ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__mp_lock(ffffffff838ce178) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline]
__mp_lock(ffffffff838ce178) at __mp_lock+0x192 sys/kern/kern_lock.c:165
softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83
dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
cnputc(5f) at cnputc+0x67 sys/dev/cons.c:218
db_putchar(5f) at db_putchar+0x36d sys/ddb/db_output.c:155
kprintf() at kprintf+0x29a5 sys/kern/subr_prf.c:-1
db_printf(ffffffff83386902) at db_printf+0x9b sys/kern/subr_prf.c:-1
panic(ffffffff833aedf0) at panic+0x103 sys/kern/subr_prf.c:217
__assert(ffffffff833ee9a7,ffffffff83341a38,51d,ffffffff8341e41d) at __assert+0x29 sys/kern/subr_prf.c:-1
uvm_pageactivate(fffffd8008689bb0) at uvm_pageactivate+0x1e3 sys/uvm/uvm_page.c:1306
end trace frame: 0xffff80003a804ac0, count: 0
ddb{0}> trace
x86_ipi_db(ffffffff83895ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__mp_lock(ffffffff838ce178) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline]
__mp_lock(ffffffff838ce178) at __mp_lock+0x192 sys/kern/kern_lock.c:165
softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83
dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
cnputc(5f) at cnputc+0x67 sys/dev/cons.c:218
db_putchar(5f) at db_putchar+0x36d sys/ddb/db_output.c:155
kprintf() at kprintf+0x29a5 sys/kern/subr_prf.c:-1
db_printf(ffffffff83386902) at db_printf+0x9b sys/kern/subr_prf.c:-1
panic(ffffffff833aedf0) at panic+0x103 sys/kern/subr_prf.c:217
__assert(ffffffff833ee9a7,ffffffff83341a38,51d,ffffffff8341e41d) at __assert+0x29 sys/kern/subr_prf.c:-1
uvm_pageactivate(fffffd8008689bb0) at uvm_pageactivate+0x1e3 sys/uvm/uvm_page.c:1306
uvm_fault_upper_lookup(ffff80003a804bd0,ffff80003a804c08,ffff80003a804ad0,ffff80003a804b50) at uvm_fault_upper_lookup+0x24d sys/uvm/uvm_fault.c:977
uvm_fault(fffffd806cc83d80,200000000000,0,1) at uvm_fault+0x159 sys/uvm/uvm_fault.c:632
kpageflttrap(ffff80003a804d80,200000000080) at kpageflttrap+0x2f4 sys/arch/amd64/amd64/trap.c:283
kerntrap(ffff80003a804d80) at kerntrap+0x19c sys/arch/amd64/amd64/trap.c:520
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
_copyin() at _copyin+0x5b
syscall(ffff80003a805030) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003a805030) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xe8d4c53ede0, count: -22
ddb{0}> machine ddbcpu 1
Stopped at savectx+0xae: movl $0,%gs:0x688
savectx() at savectx+0xae
end of kernel
end trace frame: 0x797dd618f120, count: 14
ddb{1}> trace
savectx() at savectx+0xae
end of kernel
end trace frame: 0x797dd618f120, count: -1
---
This report is generated by a bot. It may contain errors.
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#syz undup
syzbot found the following issue on:
HEAD commit: d004c0aeba6f Update show rib mem stats now that we have pe..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=14ed1a1a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=c1461974b88117f479c9
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ca88e5805262/disk-d004c0ae.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/35132e341690/bsd-d004c0ae.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a8694f8c2c36/kernel-d004c0ae.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c14619...@syzkaller.appspotmail.com
login: panic: kernel diagnostic assertion "(pg->pgW_ARfNlaINgGs: &S P(L NPQ_OT LOWERED ON SYSCALL 91 -703008456 EXIT 0 a
Stopped at savectx+0xae: movl $0,%gs:0x688
TID PID UID PRFLAGS PFLAGS CPU COMMAND
43370 7889 32767 0x10 0x4000000 0 syz-executor
* 15280 7931 32767 0x10 0 1 syz-executor
savectx() at savectx+0xae
end of kernel
end trace frame: 0x797dd618f120, count: 14
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{1}>
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
*cpu0: kernel diagnostic assertion "(pg->pg_flags & (PQ_INACTIVE|PQ_ACTIVE)) == 0" failed: file "/syzkaller/managers/setuid/kernel/sys/uvm/uvm_page.c", line 1309
ddb{1}> trace
savectx() at savectx+0xae
end of kernel
end trace frame: 0x797dd618f120, count: -1
ddb{1}> show registers
rdi 0
rsi 0
rbp 0xffff800035fddf10
rbx 0
rdx 0
rcx 0xffff8000fffee548
rax 0x3b
r8 0xffff800035fdde40
r9 0x1
r10 0xe5f88f609d58c19e
r11 0xea7c0d5b90bd70b3
r12 0
r13 0
r14 0xffff8000fffee548
r15 0
rip 0xffffffff812673ee savectx+0xae
cs 0x8
rflags 0x46
rsp 0xffff800035fdde90
ss 0x10
savectx+0xae: movl $0,%gs:0x688
ddb{1}> show proc
PROC (syz-executor) tid=15280 pid=7931 tcnt=1 stat=onproc
flags process=10<SUGID> proc=0
runpri=32, usrpri=50, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff8000fffee018,0xffff8000393f94f0
process=0xffff800032bbc4e8 user=0xffff800035fd8000, vmspace=0xfffffd806ce01208
estcpu=36, cpticks=8, pctcpu=0.1, user=0, sys=8, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
7889 169348 49570 32767 2 0x10 syz-executor
7889 43370 49570 32767 7 0x4000010 syz-executor
27646 280616 7931 32767 3 0x90 nanoslp syz-executor
27646 162315 7931 32767 3 0x4000090 msgwait syz-executor
31833 324315 85434 32767 2 0xc90 syz-executor
31833 247231 85434 32767 3 0x4000090 kqsel syz-executor
31833 233349 85434 32767 3 0x4000090 fsleep syz-executor
19255 63148 4768 0 3 0x82 sbwait sshd-session
79073 134555 94370 32767 2 0xc90 syz-executor
79073 336384 94370 32767 3 0x4000090 netacc syz-executor
79073 345 94370 32767 3 0x4000090 fsleep syz-executor
94370 257125 95516 32767 3 0x90 nanoslp syz-executor
49570 81151 54002 32767 2 0xc90 syz-executor
69392 189152 1217 32767 2 0xc90 syz-executor
* 7931 15280 87267 32767 7 0x10 syz-executor
67288 227042 13587 32767 3 0x90 wait syz-executor
85434 392866 49921 32767 3 0x90 nanoslp syz-executor
33202 482365 70604 32767 3 0x90 nanoslp syz-executor
7571 368004 45371 32767 3 0x90 nanoslp syz-executor
45371 254766 6921 0 3 0x82 wait syz-executor
13587 458303 6921 0 3 0x82 wait syz-executor
49921 420204 6921 0 3 0x82 wait syz-executor
1217 29 6921 0 3 0x82 wait syz-executor
70604 478449 6921 0 3 0x82 wait syz-executor
54002 360890 6921 0 3 0x82 wait syz-executor
87267 42585 6921 0 3 0x82 wait syz-executor
95516 432222 6921 0 3 0x82 wait syz-executor
6921 297975 65863 0 3 0x82 kqread syz-executor
65863 33617 99506 0 3 0x10008a sigsusp ksh
99506 357696 81177 0 3 0x98 kqread sshd-session
81177 194842 4768 0 3 0x92 kqread sshd-session
49904 399897 1 0 3 0x100083 ttyin getty
4768 157017 1 0 3 0x88 kqread sshd
73013 304449 51116 73 3 0x1100090 kqread syslogd
51116 44095 1 0 3 0x100082 sbwait syslogd
16052 232093 1 0 3 0x100080 kqread resolvd
9966 2495 58002 77 3 0x100092 kqread dhcpleased
28363 461317 58002 77 3 0x100092 kqread dhcpleased
58002 5446 1 0 3 0x80 kqread dhcpleased
38218 201003 0 0 3 0x14200 bored smr
96823 120421 0 0 2 0x14200 zerothread
33795 304207 0 0 3 0x14200 aiodoned aiodoned
2189 258765 0 0 3 0x14200 syncer update
59683 55851 0 0 3 0x14200 cleaner cleaner
11934 364047 0 0 2 0x14200 reaper
23164 328139 0 0 3 0x14200 pgdaemon pagedaemon
41572 339796 0 0 3 0x14200 bored viomb
55958 103651 0 0 3 0x40014200 acpi0 acpi0
42793 358867 0 0 3 0x40014200 idle1
79863 424426 0 0 3 0x14200 bored softnet1
46556 504340 0 0 3 0x14200 bored softnet0
38686 412487 0 0 3 0x14200 bored systqmp
90749 410451 0 0 3 0x14200 bored systq
17502 2575 0 0 3 0x14200 tmoslp softclockmp
42963 211780 0 0 3 0x40014200 tmoslp softclock
51076 505826 0 0 3 0x40014200 idle0
1 391470 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
CPU 1:
exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff838d7ec8)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:311
#2 mtx_enter+0x62 sys/kern/kern_lock.c:261
#3 uvm_pmr_freepages+0x1a8 sys/uvm/uvm_pmemrange.c:-1
#4 uvm_anfree_list+0x1e5 sys/uvm/uvm_anon.c:129
#5 amap_wipeout+0x248 sys/uvm/uvm_amap.c:-1
#6 uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353
#7 uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525
#8 exit1+0x6fc sys/kern/kern_exit.c:260
#9 sys_exit+0x1a sys/kern/kern_exit.c:-1
#10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775
#11 Xsyscall+0x128
Process 7889 (syz-executor) thread 0xffff80003a8134e8 (43370)
shared rwlock amaplk r = 0 (0xfffffd8079790700)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413
#2 uvm_fault_check+0x8a9 sys/uvm/uvm_fault.c:834
#3 uvm_fault+0x106 sys/uvm/uvm_fault.c:627
#4 kpageflttrap+0x2f4 sys/arch/amd64/amd64/trap.c:283
#5 kerntrap+0x19c sys/arch/amd64/amd64/trap.c:520
#6 alltraps_kern_meltdown+0x7b
#7 _copyin+0x5b
#8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
#9 Xsyscall+0x128
shared rwlock vmmaplk r = 0 (0xfffffd806cc83e80)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413
#2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880
#3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693
#4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627
#5 kpageflttrap+0x2f4 sys/arch/amd64/amd64/trap.c:283
#6 kerntrap+0x19c sys/arch/amd64/amd64/trap.c:520
#7 alltraps_kern_meltdown+0x7b
#8 _copyin+0x5b
#9 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#9 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
#10 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10216 10961K 10973K 166960K 11309 0
pcb 17 12K 12K 166960K 17 0
rtable 243 6K 7K 166960K 363 0
pf 31 16K 16K 166960K 31 0
ifaddr 42 7K 7K 166960K 44 0
ifgroup 50 2K 2K 166960K 50 0
sysctl 1 1K 9K 166960K 6 0
counters 70 37K 37K 166960K 70 0
ioctlops 0 0K 2K 166960K 67 0
iov 0 0K 16K 166960K 14 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1336 84K 84K 166960K 1462 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 8 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 1K 166960K 23 0
dirhash 12 2K 2K 166960K 18 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 25 93K 125K 166960K 335 0
sigio 0 0K 0K 166960K 7 0
proc 58 99K 147K 166960K 497 0
subproc 72 4K 4K 166960K 72 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 35 0
in_multi 99 7K 7K 166960K 104 0
ether_multi 1 0K 0K 166960K 1 0
mrt 1 0K 0K 166960K 1 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 229 1023K 1023K 166960K 229 0
exec 0 0K 1K 166960K 365 0
fusefs mount 1 32K 32K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 269 169K 174K 166960K 4932 0
UVM aobj 13 6K 6K 166960K 13 0
pinsyscall 48 96K 116K 166960K 1381 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 2 0K 0K 166960K 16 0
NDP 11 0K 2K 166960K 27 0
temp 45 8672K 8737K 166960K 4561 0
kqueue 14 22K 25K 166960K 60 0
SYN cache 2 16K 16K 166960K 2 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 26 0 0 1 0 1 1 0 8 0
rtpcb 120 55 0 52 1 0 1 1 0 8 0
rtentry 176 114 0 1 6 0 6 6 0 8 0
unpcb 144 232 0 212 4 0 4 4 0 8 2
syncache 336 6 0 6 1 0 1 1 0 8 1
tcpcb 736 197 0 189 7 0 7 7 0 8 6
arp 136 18 0 0 1 0 1 1 0 8 0
ipq 40 2 0 1 1 0 1 1 0 8 0
ipqe 40 5 0 3 1 0 1 1 0 8 0
inpcb 328 507 0 494 7 0 7 7 0 8 5
ip6q 72 1 0 0 1 0 1 1 0 8 0
ip6af 40 1 0 0 1 0 1 1 0 8 0
nd6 152 27 0 0 2 0 2 2 0 8 0
kcovpl 48 8 0 0 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 486 0 0 31 0 31 31 0 8 0
art_table 40 487 0 0 5 0 5 5 0 8 0
art_node 32 114 0 11 1 0 1 1 0 8 0
sysvmsgpl 40 8 0 2 1 0 1 1 0 8 0
semapl 112 18 0 8 1 0 1 1 0 8 0
shmpl 112 10 0 0 1 0 1 1 0 8 0
dirhash 1024 21 0 4 3 0 3 3 0 8 0
dino2pl 256 1923 0 413 95 0 95 95 0 8 0
ffsino 296 1923 0 413 117 0 117 117 0 8 0
nchpl 144 2441 0 750 63 0 63 63 0 8 0
vnodes 216 2004 0 0 112 0 112 112 0 8 0
namei 1024 7764 0 7764 1 0 1 1 0 8 1
percpumem 16 50 0 0 1 0 1 1 0 8 0
kstatmem 264 24 0 0 2 0 2 2 0 8 0
scxspl 216 7631 0 7631 3 1 2 2 1 8 2
plimitpl 152 68 0 41 2 0 2 2 0 8 0
sigapl 424 617 0 562 7 0 7 7 0 8 0
knotepl 120 309 0 0 10 0 10 10 0 8 0
kqueuepl 224 63 0 52 1 0 1 1 0 8 0
pipepl 344 127 0 100 3 0 3 3 0 8 0
fdescpl 528 601 0 563 4 0 4 4 0 8 1
filepl 160 3272 0 3037 14 0 14 14 0 8 3
lockfpl 104 46 0 43 1 0 1 1 0 8 0
lockfspl 48 21 0 18 1 0 1 1 0 8 0
sessionpl 144 22 0 5 1 0 1 1 0 8 0
pgrppl 48 36 0 11 1 0 1 1 0 8 0
ucredpl 104 738 0 719 1 0 1 1 0 8 0
zombiepl 144 566 0 562 1 0 1 1 0 8 0
processpl 1232 617 0 562 5 0 5 5 0 8 0
procpl 664 982 0 921 7 0 7 7 0 8 0
sosppl 176 1 0 1 1 0 1 1 0 8 1
sockpl 752 800 0 763 12 0 12 12 0 8 7
mcl64k 65536 4 0 0 1 0 1 1 0 8 0
mcl16k 16384 3 0 0 1 0 1 1 0 8 0
mcl8k 8192 1 0 0 1 0 1 1 0 8 0
mcl4k 4096 117 0 0 15 0 15 15 0 8 0
mcl2k 2048 24 0 0 3 0 3 3 0 8 0
mtagpl 96 3 0 0 1 0 1 1 0 8 0
mbufpl 256 267 0 0 17 0 17 17 0 8 0
bufpl 280 2729 0 118 187 0 187 187 0 8 0
anonpl 32 10274 0 0 83 0 83 83 0 246 0
amapchunkpl 152 15615 0 14922 34 0 34 34 0 158 5
amappl16 200 2632 0 2607 14 3 11 14 0 8 8
amappl15 192 9 0 9 1 1 0 1 0 8 0
amappl14 184 6 0 6 1 1 0 1 0 8 0
amappl13 176 399 0 398 1 0 1 1 0 8 0
amappl12 168 935 0 887 3 0 3 3 0 8 0
amappl11 160 5 0 4 1 0 1 1 0 8 0
amappl10 152 76 0 66 1 0 1 1 0 8 0
amappl9 144 250 0 250 1 1 0 1 0 8 0
amappl8 136 21 0 20 1 0 1 1 0 8 0
amappl7 128 77 0 76 1 0 1 1 0 8 0
amappl6 120 279 0 267 1 0 1 1 0 8 0
amappl5 112 83 0 74 1 0 1 1 0 8 0
amappl4 104 368 0 343 1 0 1 1 0 8 0
amappl3 96 2607 0 2479 4 0 4 4 0 8 0
amappl2 88 491 0 432 2 0 2 2 0 8 0
amappl1 80 9643 0 8988 15 1 14 15 0 8 0
amappl 88 4214 0 4022 5 0 5 5 0 92 0
uvmvnodes 80 109 0 0 3 0 3 3 0 8 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma1024 1024 1 0 0 1 0 1 1 0 8 0
dma256 256 6 0 6 1 1 0 1 0 8 0
dma128 128 253 0 253 1 1 0 1 0 8 0
dma64 64 6 0 6 1 1 0 1 0 8 0
dma32 32 7 0 7 1 1 0 1 0 8 0
dma16 16 18 0 17 1 0 1 1 0 8 0
aobjpl 72 12 0 0 1 0 1 1 0 8 0
uaddrrnd 24 601 0 563 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 601 0 563 1 0 1 1 0 8 0
vmmpekpl 168 6607 0 6576 2 0 2 2 0 8 0
vmmpepl 168 45999 0 43798 103 0 103 103 0 357 4
vmsppl 488 600 0 562 7 1 6 6 0 8 1
rwobjpl 80 15952 0 14888 25 0 25 25 0 8 2
pdppl 4096 1210 0 1124 108 22 86 98 0 8 0
pvpl 32 19737 0 0 160 0 160 160 0 265 0
pmappl 256 600 0 562 4 1 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 292 0 25 8 0 8 8 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffffffff83895ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__mp_lock(ffffffff838ce178) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline]
__mp_lock(ffffffff838ce178) at __mp_lock+0x192 sys/kern/kern_lock.c:165
softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83
dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
cnputc(5f) at cnputc+0x67 sys/dev/cons.c:218
db_putchar(5f) at db_putchar+0x36d sys/ddb/db_output.c:155
kprintf() at kprintf+0x29a5 sys/kern/subr_prf.c:-1
db_printf(ffffffff83386902) at db_printf+0x9b sys/kern/subr_prf.c:-1
panic(ffffffff833aedf0) at panic+0x103 sys/kern/subr_prf.c:217
__assert(ffffffff833ee9a7,ffffffff83341a38,51d,ffffffff8341e41d) at __assert+0x29 sys/kern/subr_prf.c:-1
uvm_pageactivate(fffffd8008689bb0) at uvm_pageactivate+0x1e3 sys/uvm/uvm_page.c:1306
end trace frame: 0xffff80003a804ac0, count: 0
ddb{0}> trace
x86_ipi_db(ffffffff83895ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__mp_lock(ffffffff838ce178) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline]
__mp_lock(ffffffff838ce178) at __mp_lock+0x192 sys/kern/kern_lock.c:165
softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83
dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
cnputc(5f) at cnputc+0x67 sys/dev/cons.c:218
db_putchar(5f) at db_putchar+0x36d sys/ddb/db_output.c:155
kprintf() at kprintf+0x29a5 sys/kern/subr_prf.c:-1
db_printf(ffffffff83386902) at db_printf+0x9b sys/kern/subr_prf.c:-1
panic(ffffffff833aedf0) at panic+0x103 sys/kern/subr_prf.c:217
__assert(ffffffff833ee9a7,ffffffff83341a38,51d,ffffffff8341e41d) at __assert+0x29 sys/kern/subr_prf.c:-1
uvm_pageactivate(fffffd8008689bb0) at uvm_pageactivate+0x1e3 sys/uvm/uvm_page.c:1306
uvm_fault_upper_lookup(ffff80003a804bd0,ffff80003a804c08,ffff80003a804ad0,ffff80003a804b50) at uvm_fault_upper_lookup+0x24d sys/uvm/uvm_fault.c:977
uvm_fault(fffffd806cc83d80,200000000000,0,1) at uvm_fault+0x159 sys/uvm/uvm_fault.c:632
kpageflttrap(ffff80003a804d80,200000000080) at kpageflttrap+0x2f4 sys/arch/amd64/amd64/trap.c:283
kerntrap(ffff80003a804d80) at kerntrap+0x19c sys/arch/amd64/amd64/trap.c:520
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
_copyin() at _copyin+0x5b
syscall(ffff80003a805030) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003a805030) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xe8d4c53ede0, count: -22
ddb{0}> machine ddbcpu 1
Stopped at savectx+0xae: movl $0,%gs:0x688
savectx() at savectx+0xae
end of kernel
end trace frame: 0x797dd618f120, count: 14
ddb{1}> trace
savectx() at savectx+0xae
end of kernel
end trace frame: 0x797dd618f120, count: -1
---
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