uvm_fault: amap_lookups
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syzbot
Jul 13, 2026, 8:24:35 PM (5 days ago) Jul 13
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 925b83c94733 Add keys and menu items for copy mode line nu..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=11a7471e580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=7651266b7ef13d67cc1a
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ad2a800467b3/disk-925b83c9.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/b7b21110d722/bsd-925b83c9.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/967ef0decb13/kernel-925b83c9.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+765126...@syzkaller.appspotmail.com
uvm_fault(0xfffff9006d07e028, 0x7fff0000800f, 0, 1) -> e
kernel: page fault trap, code=0
Stopped at amap_lookups+0x1e0: movl 0x10(%r15),%r14d
TID PID UID PRFLAGS PFLAGS CPU COMMAND
* 6598 50065 32767 0x10 0 1 syz-executor
109824 68218 32767 0x10 0 0 syz-executor
amap_lookups(fffff9006bbdc728,1000,ffff80003afdb3a0,8) at amap_lookups+0x1e0 amap_chunk_get sys/uvm/uvm_amap.c:118 [inline]
amap_lookups(fffff9006bbdc728,1000,ffff80003afdb3a0,8) at amap_lookups+0x1e0 sys/uvm/uvm_amap.c:1168
uvm_fault_check(ffff80003afdb4a0,ffff80003afdb4d8,ffff80003afdb510,0) at uvm_fault_check+0x8d2 sys/uvm/uvm_fault.c:840
uvm_fault(fffff9006d07e028,434f8970000,0,1) at uvm_fault+0x106 sys/uvm/uvm_fault.c:627
upageflttrap(ffff80003afdb640,434f8970e70) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80003afdb640) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7d21abf12d70, count: 9
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
*cpu1: uvm_fault(0xfffff9006d07e028, 0x7fff0000800f, 0, 1) -> e
ddb{1}> show kasan
No such command
ddb{1}> trace
amap_lookups(fffff9006bbdc728,1000,ffff80003afdb3a0,8) at amap_lookups+0x1e0 amap_chunk_get sys/uvm/uvm_amap.c:118 [inline]
amap_lookups(fffff9006bbdc728,1000,ffff80003afdb3a0,8) at amap_lookups+0x1e0 sys/uvm/uvm_amap.c:1168
uvm_fault_check(ffff80003afdb4a0,ffff80003afdb4d8,ffff80003afdb510,0) at uvm_fault_check+0x8d2 sys/uvm/uvm_fault.c:840
uvm_fault(fffff9006d07e028,434f8970000,0,1) at uvm_fault+0x106 sys/uvm/uvm_fault.c:627
upageflttrap(ffff80003afdb640,434f8970e70) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80003afdb640) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7d21abf12d70, count: -6
ddb{1}> show registers
rdi 0x11
rsi 0x20
rbp 0xffff80003afdb2f0
rbx 0
rdx 0
rcx 0
rax 0xffff800000c40ff0
r8 0xffffffff8139b1f0 uvm_map_inentry_sp
r9 0
r10 0
r11 0xdc1d0afc5d87e146
r12 0x9
r13 0
r14 0x20
r15 0x7fff00007fff
rip 0xffffffff817dc3b0 amap_lookups+0x1e0
cs 0x8
rflags 0x10206 __ALIGN_SIZE+0xf206
rsp 0xffff80003afdb260
ss 0
amap_lookups+0x1e0: movl 0x10(%r15),%r14d
ddb{1}> show proc
PROC (syz-executor) tid=6598 pid=50065 tcnt=1 stat=onproc
flags process=10<SUGID> proc=0
runpri=56, usrpri=56, slppri=16, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff800045fe74e0,0xffffffff839de3a0
process=0xffff80003afcc4f0 user=0xffff80003afd6000, vmspace=0xfffff9006d07e028
estcpu=6, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
*50065 6598 85862 32767 7 0x10 syz-executor
79516 426659 82106 32767 2 0x10 syz-executor
2429 44902 84260 32767 2 0x10 syz-executor
64044 121537 99658 32767 2 0x10 syz-executor
22209 198192 5418 0 2 0x2800 syz-executor
84260 186631 42997 32767 2 0x10 syz-executor
42997 338412 5418 0 3 0x82 wait syz-executor
28541 520195 32445 32767 3 0x90 nanoslp syz-executor
68218 109824 57428 32767 7 0x10 syz-executor
69691 489621 25334 32767 3 0x90 piperd syz-executor
99658 18750 94340 32767 3 0x90 nanoslp syz-executor
85862 70760 21039 32767 3 0x90 nanoslp syz-executor
82106 425028 18434 32767 3 0x90 nanoslp syz-executor
25334 396324 5418 0 3 0x82 wait syz-executor
57428 90525 5418 0 3 0x82 wait syz-executor
21039 9162 5418 0 3 0x82 wait syz-executor
18434 501898 5418 0 3 0x82 wait syz-executor
32445 219027 5418 0 3 0x82 wait syz-executor
94340 46415 5418 0 3 0x82 wait syz-executor
5418 164169 37042 0 2 0x2 syz-executor
37042 350267 15351 0 3 0x10008a sigsusp ksh
15351 514853 94191 0 3 0x98 kqread sshd-session
94191 251232 99743 0 3 0x92 kqread sshd-session
72418 321496 1 0 3 0x100083 ttyin getty
99743 65220 1 0 3 0x88 kqread sshd
13285 302380 413 73 3 0x1100090 kqread syslogd
413 188118 1 0 3 0x100082 sbwait syslogd
25740 475507 1 0 3 0x100080 kqread resolvd
63375 250074 96057 77 3 0x100092 kqread dhcpleased
14514 171481 96057 77 3 0x100092 kqread dhcpleased
96057 149163 1 0 3 0x80 kqread dhcpleased
58972 467765 0 0 3 0x14200 bored smr
62008 400175 0 0 2 0x14200 zerothread
44600 354548 0 0 3 0x14200 aiodoned aiodoned
79185 386889 0 0 3 0x14200 syncer update
93007 331984 0 0 3 0x14200 cleaner cleaner
73461 372783 0 0 2 0x14200 reaper
90858 14279 0 0 3 0x14200 pgdaemon pagedaemon
96310 222939 0 0 3 0x14200 bored viomb
25066 241486 0 0 3 0x40014200 acpi0 acpi0
7920 117459 0 0 3 0x40014200 idle1
23153 522216 0 0 3 0x14200 bored softnet1
69178 2144 0 0 2 0x14200 softnet0
81067 284944 0 0 3 0x14200 bored systqmp
63718 66726 0 0 3 0x14200 bored systq
44980 187217 0 0 3 0x14200 tmoslp softclockmp
25456 288982 0 0 3 0x40014200 tmoslp softclock
51497 111493 0 0 3 0x40014200 idle0
1 375342 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 50065 (syz-executor) thread 0xffff800045fe6d18 (6598)
shared rwlock amaplk r = 0 (0xfffff9006e0abb38)
#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 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
#5 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
#6 recall_trap+0x8
shared rwlock vmmaplk r = 0 (0xfffff9006d07e128)
#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 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
#6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
#7 recall_trap+0x8
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11050 12016K 12034K 166960K 12147 0
pcb 17 12K 12K 166960K 17 0
rtable 219 6K 7K 166960K 406 0
pf 29 16K 16K 166960K 33 0
ifaddr 38 6K 7K 166960K 48 0
ifgroup 46 2K 2K 166960K 54 0
sysctl 1 1K 9K 166960K 8 0
counters 68 36K 37K 166960K 72 0
ioctlops 0 0K 4K 166960K 106 0
iov 0 0K 8K 166960K 23 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1287 81K 81K 166960K 1554 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 9K 166960K 10 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 1K 166960K 152 0
dirhash 12 2K 2K 166960K 15 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 21 74K 121K 166960K 512 0
sigio 4 0K 0K 166960K 12 0
proc 58 99K 147K 166960K 565 0
subproc 63 3K 4K 166960K 225 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 353 0
in_multi 88 6K 7K 166960K 124 0
ether_multi 1 0K 0K 166960K 3 0
mrt 1 0K 0K 166960K 17 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 79 360K 360K 166960K 79 0
exec 0 0K 1K 166960K 425 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 184 158K 187K 166960K 5990 0
UVM aobj 11 2K 2K 166960K 14 0
pinsyscall 42 84K 107K 166960K 1658 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 21 0
NDP 10 0K 2K 166960K 30 0
temp 40 9124K 9139K 166960K 4833 0
kqueue 13 20K 30K 166960K 83 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 28 0 0 1 0 1 1 0 8 0
rtpcb 120 76 0 73 1 0 1 1 0 8 0
rtentry 176 126 0 25 6 0 6 6 0 8 0
unpcb 144 389 0 374 4 3 1 4 0 8 0
syncache 336 7 0 7 1 1 0 1 0 8 0
tcpcb 736 179 0 175 7 6 1 7 0 8 0
arp 136 20 0 4 1 0 1 1 0 8 0
ipq 40 3 0 1 1 0 1 1 0 8 0
ipqe 40 5 0 2 1 0 1 1 0 8 0
inpcb 328 516 0 509 7 5 2 7 0 8 1
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 31 0 8 2 0 2 2 0 8 0
kcovpl 48 25 0 18 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 518 0 92 33 2 31 33 0 8 0
art_table 40 519 0 92 6 0 6 6 0 8 0
art_node 32 126 0 34 1 0 1 1 0 8 0
sysvmsgpl 40 2 0 2 1 1 0 1 0 8 0
semapl 72 149 0 139 1 0 1 1 0 8 0
shmpl 112 11 0 3 1 0 1 1 0 8 0
dirhash 1024 19 0 2 3 0 3 3 0 8 0
dino2pl 256 2006 0 524 93 0 93 93 0 8 0
ffsino 296 2006 0 524 115 0 115 115 0 8 0
nchpl 144 2600 0 899 64 0 64 64 0 8 0
vnodes 216 2240 0 0 125 0 125 125 0 8 0
namei 1024 8544 0 8543 2 1 1 2 0 8 0
percpumem 16 52 0 2 1 0 1 1 0 8 0
kstatmem 264 27 0 4 2 0 2 2 0 8 0
scxspl 216 8871 0 8871 11 10 1 8 1 8 1
plimitpl 152 178 0 156 2 0 2 2 0 8 0
sigapl 424 781 0 731 7 0 7 7 0 8 0
knotepl 120 443 0 0 14 0 14 14 0 8 0
kqueuepl 224 104 0 95 2 1 1 2 0 8 0
pipepl 344 270 0 240 6 3 3 6 0 8 0
fdescpl 528 765 0 732 3 0 3 3 0 8 0
filepl 160 4139 0 3943 15 5 10 15 0 8 0
lockfpl 104 131 0 129 1 0 1 1 0 8 0
lockfspl 48 41 0 39 1 0 1 1 0 8 0
sessionpl 144 61 0 46 1 0 1 1 0 8 0
pgrppl 48 89 0 67 1 0 1 1 0 8 0
ucredpl 104 630 0 611 1 0 1 1 0 8 0
zombiepl 144 732 0 731 1 0 1 1 0 8 0
processpl 1232 781 0 731 5 0 5 5 0 8 0
procpl 664 1280 0 1230 7 1 6 7 0 8 1
sockpl 752 987 0 962 17 13 4 17 0 8 1
mcl64k 65536 5 0 0 1 0 1 1 0 8 0
mcl9k128 9344 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 108 0 0 14 0 14 14 0 8 0
mcl2k 2048 20 0 0 3 0 3 3 0 8 0
mextrefs 64 16 0 0 1 0 1 1 0 8 0
mtagpl 96 2 0 0 1 0 1 1 0 8 0
mbufpl 256 304 0 0 19 0 19 19 0 8 0
bufpl 272 2681 0 102 172 0 172 172 0 8 0
anonpl 32 9448 0 0 77 0 77 77 0 247 0
amapchunkpl 152 18270 0 17928 34 9 25 34 0 158 5
amappl16 200 3158 0 3143 27 17 10 14 0 8 8
amappl15 192 7 0 7 1 1 0 1 0 8 0
amappl14 184 503 0 502 1 0 1 1 0 8 0
amappl13 176 150 0 140 1 0 1 1 0 8 0
amappl12 168 1017 0 989 2 0 2 2 0 8 0
amappl11 160 2 0 1 1 0 1 1 0 8 0
amappl10 152 62 0 52 1 0 1 1 0 8 0
amappl9 144 278 0 277 1 0 1 1 0 8 0
amappl8 136 110 0 109 1 0 1 1 0 8 0
amappl7 128 167 0 156 1 0 1 1 0 8 0
amappl6 120 175 0 172 1 0 1 1 0 8 0
amappl5 112 98 0 90 1 0 1 1 0 8 0
amappl4 104 298 0 282 1 0 1 1 0 8 0
amappl3 96 3489 0 3408 5 1 4 4 0 8 0
amappl2 88 562 0 508 2 0 2 2 0 8 0
amappl1 80 12117 0 11577 16 2 14 16 0 8 0
amappl 88 5186 0 5065 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 13 0 3 1 0 1 1 0 8 0
uaddrrnd 24 765 0 732 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 765 0 732 1 0 1 1 0 8 0
vmmpekpl 168 8540 0 8490 3 0 3 3 0 8 0
vmmpepl 168 58331 0 56536 104 9 95 104 0 357 6
vmsppl 488 764 0 731 7 1 6 6 0 8 0
rwobjpl 80 19548 0 18682 25 0 25 25 0 8 0
pdppl 4096 1537 0 1462 121 44 77 95 0 8 2
pvpl 32 17599 0 0 142 0 142 142 0 265 0
pmappl 256 764 0 731 4 1 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 478 0 57 13 0 13 13 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffffffff839a7ff0) 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(ffffffff83a8f2c0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83a8f2c0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173
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
__mp_lock(ffffffff83a8f2c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83a8f2c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173
syscall(ffff80003abace80) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline]
syscall(ffff80003abace80) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x738aba46a8c0, count: 5
ddb{0}> trace
x86_ipi_db(ffffffff839a7ff0) 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(ffffffff83a8f2c0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83a8f2c0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173
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
__mp_lock(ffffffff83a8f2c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83a8f2c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173
syscall(ffff80003abace80) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline]
syscall(ffff80003abace80) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x738aba46a8c0, count: -10
ddb{0}> machine ddbcpu 1
Stopped at amap_lookups+0x1e0: movl 0x10(%r15),%r14d
amap_lookups(fffff9006bbdc728,1000,ffff80003afdb3a0,8) at amap_lookups+0x1e0 amap_chunk_get sys/uvm/uvm_amap.c:118 [inline]
amap_lookups(fffff9006bbdc728,1000,ffff80003afdb3a0,8) at amap_lookups+0x1e0 sys/uvm/uvm_amap.c:1168
uvm_fault_check(ffff80003afdb4a0,ffff80003afdb4d8,ffff80003afdb510,0) at uvm_fault_check+0x8d2 sys/uvm/uvm_fault.c:840
uvm_fault(fffff9006d07e028,434f8970000,0,1) at uvm_fault+0x106 sys/uvm/uvm_fault.c:627
upageflttrap(ffff80003afdb640,434f8970e70) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80003afdb640) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7d21abf12d70, count: 9
ddb{1}> trace
amap_lookups(fffff9006bbdc728,1000,ffff80003afdb3a0,8) at amap_lookups+0x1e0 amap_chunk_get sys/uvm/uvm_amap.c:118 [inline]
amap_lookups(fffff9006bbdc728,1000,ffff80003afdb3a0,8) at amap_lookups+0x1e0 sys/uvm/uvm_amap.c:1168
uvm_fault_check(ffff80003afdb4a0,ffff80003afdb4d8,ffff80003afdb510,0) at uvm_fault_check+0x8d2 sys/uvm/uvm_fault.c:840
uvm_fault(fffff9006d07e028,434f8970000,0,1) at uvm_fault+0x106 sys/uvm/uvm_fault.c:627
upageflttrap(ffff80003afdb640,434f8970e70) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80003afdb640) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7d21abf12d70, count: -6
---
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syzbot found the following issue on:
HEAD commit: 925b83c94733 Add keys and menu items for copy mode line nu..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=11a7471e580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=7651266b7ef13d67cc1a
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ad2a800467b3/disk-925b83c9.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/b7b21110d722/bsd-925b83c9.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/967ef0decb13/kernel-925b83c9.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+765126...@syzkaller.appspotmail.com
uvm_fault(0xfffff9006d07e028, 0x7fff0000800f, 0, 1) -> e
kernel: page fault trap, code=0
Stopped at amap_lookups+0x1e0: movl 0x10(%r15),%r14d
TID PID UID PRFLAGS PFLAGS CPU COMMAND
* 6598 50065 32767 0x10 0 1 syz-executor
109824 68218 32767 0x10 0 0 syz-executor
amap_lookups(fffff9006bbdc728,1000,ffff80003afdb3a0,8) at amap_lookups+0x1e0 amap_chunk_get sys/uvm/uvm_amap.c:118 [inline]
amap_lookups(fffff9006bbdc728,1000,ffff80003afdb3a0,8) at amap_lookups+0x1e0 sys/uvm/uvm_amap.c:1168
uvm_fault_check(ffff80003afdb4a0,ffff80003afdb4d8,ffff80003afdb510,0) at uvm_fault_check+0x8d2 sys/uvm/uvm_fault.c:840
uvm_fault(fffff9006d07e028,434f8970000,0,1) at uvm_fault+0x106 sys/uvm/uvm_fault.c:627
upageflttrap(ffff80003afdb640,434f8970e70) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80003afdb640) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7d21abf12d70, count: 9
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
*cpu1: uvm_fault(0xfffff9006d07e028, 0x7fff0000800f, 0, 1) -> e
ddb{1}> show kasan
No such command
ddb{1}> trace
amap_lookups(fffff9006bbdc728,1000,ffff80003afdb3a0,8) at amap_lookups+0x1e0 amap_chunk_get sys/uvm/uvm_amap.c:118 [inline]
amap_lookups(fffff9006bbdc728,1000,ffff80003afdb3a0,8) at amap_lookups+0x1e0 sys/uvm/uvm_amap.c:1168
uvm_fault_check(ffff80003afdb4a0,ffff80003afdb4d8,ffff80003afdb510,0) at uvm_fault_check+0x8d2 sys/uvm/uvm_fault.c:840
uvm_fault(fffff9006d07e028,434f8970000,0,1) at uvm_fault+0x106 sys/uvm/uvm_fault.c:627
upageflttrap(ffff80003afdb640,434f8970e70) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80003afdb640) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7d21abf12d70, count: -6
ddb{1}> show registers
rdi 0x11
rsi 0x20
rbp 0xffff80003afdb2f0
rbx 0
rdx 0
rcx 0
rax 0xffff800000c40ff0
r8 0xffffffff8139b1f0 uvm_map_inentry_sp
r9 0
r10 0
r11 0xdc1d0afc5d87e146
r12 0x9
r13 0
r14 0x20
r15 0x7fff00007fff
rip 0xffffffff817dc3b0 amap_lookups+0x1e0
cs 0x8
rflags 0x10206 __ALIGN_SIZE+0xf206
rsp 0xffff80003afdb260
ss 0
amap_lookups+0x1e0: movl 0x10(%r15),%r14d
ddb{1}> show proc
PROC (syz-executor) tid=6598 pid=50065 tcnt=1 stat=onproc
flags process=10<SUGID> proc=0
runpri=56, usrpri=56, slppri=16, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff800045fe74e0,0xffffffff839de3a0
process=0xffff80003afcc4f0 user=0xffff80003afd6000, vmspace=0xfffff9006d07e028
estcpu=6, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
*50065 6598 85862 32767 7 0x10 syz-executor
79516 426659 82106 32767 2 0x10 syz-executor
2429 44902 84260 32767 2 0x10 syz-executor
64044 121537 99658 32767 2 0x10 syz-executor
22209 198192 5418 0 2 0x2800 syz-executor
84260 186631 42997 32767 2 0x10 syz-executor
42997 338412 5418 0 3 0x82 wait syz-executor
28541 520195 32445 32767 3 0x90 nanoslp syz-executor
68218 109824 57428 32767 7 0x10 syz-executor
69691 489621 25334 32767 3 0x90 piperd syz-executor
99658 18750 94340 32767 3 0x90 nanoslp syz-executor
85862 70760 21039 32767 3 0x90 nanoslp syz-executor
82106 425028 18434 32767 3 0x90 nanoslp syz-executor
25334 396324 5418 0 3 0x82 wait syz-executor
57428 90525 5418 0 3 0x82 wait syz-executor
21039 9162 5418 0 3 0x82 wait syz-executor
18434 501898 5418 0 3 0x82 wait syz-executor
32445 219027 5418 0 3 0x82 wait syz-executor
94340 46415 5418 0 3 0x82 wait syz-executor
5418 164169 37042 0 2 0x2 syz-executor
37042 350267 15351 0 3 0x10008a sigsusp ksh
15351 514853 94191 0 3 0x98 kqread sshd-session
94191 251232 99743 0 3 0x92 kqread sshd-session
72418 321496 1 0 3 0x100083 ttyin getty
99743 65220 1 0 3 0x88 kqread sshd
13285 302380 413 73 3 0x1100090 kqread syslogd
413 188118 1 0 3 0x100082 sbwait syslogd
25740 475507 1 0 3 0x100080 kqread resolvd
63375 250074 96057 77 3 0x100092 kqread dhcpleased
14514 171481 96057 77 3 0x100092 kqread dhcpleased
96057 149163 1 0 3 0x80 kqread dhcpleased
58972 467765 0 0 3 0x14200 bored smr
62008 400175 0 0 2 0x14200 zerothread
44600 354548 0 0 3 0x14200 aiodoned aiodoned
79185 386889 0 0 3 0x14200 syncer update
93007 331984 0 0 3 0x14200 cleaner cleaner
73461 372783 0 0 2 0x14200 reaper
90858 14279 0 0 3 0x14200 pgdaemon pagedaemon
96310 222939 0 0 3 0x14200 bored viomb
25066 241486 0 0 3 0x40014200 acpi0 acpi0
7920 117459 0 0 3 0x40014200 idle1
23153 522216 0 0 3 0x14200 bored softnet1
69178 2144 0 0 2 0x14200 softnet0
81067 284944 0 0 3 0x14200 bored systqmp
63718 66726 0 0 3 0x14200 bored systq
44980 187217 0 0 3 0x14200 tmoslp softclockmp
25456 288982 0 0 3 0x40014200 tmoslp softclock
51497 111493 0 0 3 0x40014200 idle0
1 375342 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 50065 (syz-executor) thread 0xffff800045fe6d18 (6598)
shared rwlock amaplk r = 0 (0xfffff9006e0abb38)
#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 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
#5 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
#6 recall_trap+0x8
shared rwlock vmmaplk r = 0 (0xfffff9006d07e128)
#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 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
#6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
#7 recall_trap+0x8
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11050 12016K 12034K 166960K 12147 0
pcb 17 12K 12K 166960K 17 0
rtable 219 6K 7K 166960K 406 0
pf 29 16K 16K 166960K 33 0
ifaddr 38 6K 7K 166960K 48 0
ifgroup 46 2K 2K 166960K 54 0
sysctl 1 1K 9K 166960K 8 0
counters 68 36K 37K 166960K 72 0
ioctlops 0 0K 4K 166960K 106 0
iov 0 0K 8K 166960K 23 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1287 81K 81K 166960K 1554 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 9K 166960K 10 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 1K 166960K 152 0
dirhash 12 2K 2K 166960K 15 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 21 74K 121K 166960K 512 0
sigio 4 0K 0K 166960K 12 0
proc 58 99K 147K 166960K 565 0
subproc 63 3K 4K 166960K 225 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 353 0
in_multi 88 6K 7K 166960K 124 0
ether_multi 1 0K 0K 166960K 3 0
mrt 1 0K 0K 166960K 17 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 79 360K 360K 166960K 79 0
exec 0 0K 1K 166960K 425 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 184 158K 187K 166960K 5990 0
UVM aobj 11 2K 2K 166960K 14 0
pinsyscall 42 84K 107K 166960K 1658 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 21 0
NDP 10 0K 2K 166960K 30 0
temp 40 9124K 9139K 166960K 4833 0
kqueue 13 20K 30K 166960K 83 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 28 0 0 1 0 1 1 0 8 0
rtpcb 120 76 0 73 1 0 1 1 0 8 0
rtentry 176 126 0 25 6 0 6 6 0 8 0
unpcb 144 389 0 374 4 3 1 4 0 8 0
syncache 336 7 0 7 1 1 0 1 0 8 0
tcpcb 736 179 0 175 7 6 1 7 0 8 0
arp 136 20 0 4 1 0 1 1 0 8 0
ipq 40 3 0 1 1 0 1 1 0 8 0
ipqe 40 5 0 2 1 0 1 1 0 8 0
inpcb 328 516 0 509 7 5 2 7 0 8 1
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 31 0 8 2 0 2 2 0 8 0
kcovpl 48 25 0 18 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 518 0 92 33 2 31 33 0 8 0
art_table 40 519 0 92 6 0 6 6 0 8 0
art_node 32 126 0 34 1 0 1 1 0 8 0
sysvmsgpl 40 2 0 2 1 1 0 1 0 8 0
semapl 72 149 0 139 1 0 1 1 0 8 0
shmpl 112 11 0 3 1 0 1 1 0 8 0
dirhash 1024 19 0 2 3 0 3 3 0 8 0
dino2pl 256 2006 0 524 93 0 93 93 0 8 0
ffsino 296 2006 0 524 115 0 115 115 0 8 0
nchpl 144 2600 0 899 64 0 64 64 0 8 0
vnodes 216 2240 0 0 125 0 125 125 0 8 0
namei 1024 8544 0 8543 2 1 1 2 0 8 0
percpumem 16 52 0 2 1 0 1 1 0 8 0
kstatmem 264 27 0 4 2 0 2 2 0 8 0
scxspl 216 8871 0 8871 11 10 1 8 1 8 1
plimitpl 152 178 0 156 2 0 2 2 0 8 0
sigapl 424 781 0 731 7 0 7 7 0 8 0
knotepl 120 443 0 0 14 0 14 14 0 8 0
kqueuepl 224 104 0 95 2 1 1 2 0 8 0
pipepl 344 270 0 240 6 3 3 6 0 8 0
fdescpl 528 765 0 732 3 0 3 3 0 8 0
filepl 160 4139 0 3943 15 5 10 15 0 8 0
lockfpl 104 131 0 129 1 0 1 1 0 8 0
lockfspl 48 41 0 39 1 0 1 1 0 8 0
sessionpl 144 61 0 46 1 0 1 1 0 8 0
pgrppl 48 89 0 67 1 0 1 1 0 8 0
ucredpl 104 630 0 611 1 0 1 1 0 8 0
zombiepl 144 732 0 731 1 0 1 1 0 8 0
processpl 1232 781 0 731 5 0 5 5 0 8 0
procpl 664 1280 0 1230 7 1 6 7 0 8 1
sockpl 752 987 0 962 17 13 4 17 0 8 1
mcl64k 65536 5 0 0 1 0 1 1 0 8 0
mcl9k128 9344 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 108 0 0 14 0 14 14 0 8 0
mcl2k 2048 20 0 0 3 0 3 3 0 8 0
mextrefs 64 16 0 0 1 0 1 1 0 8 0
mtagpl 96 2 0 0 1 0 1 1 0 8 0
mbufpl 256 304 0 0 19 0 19 19 0 8 0
bufpl 272 2681 0 102 172 0 172 172 0 8 0
anonpl 32 9448 0 0 77 0 77 77 0 247 0
amapchunkpl 152 18270 0 17928 34 9 25 34 0 158 5
amappl16 200 3158 0 3143 27 17 10 14 0 8 8
amappl15 192 7 0 7 1 1 0 1 0 8 0
amappl14 184 503 0 502 1 0 1 1 0 8 0
amappl13 176 150 0 140 1 0 1 1 0 8 0
amappl12 168 1017 0 989 2 0 2 2 0 8 0
amappl11 160 2 0 1 1 0 1 1 0 8 0
amappl10 152 62 0 52 1 0 1 1 0 8 0
amappl9 144 278 0 277 1 0 1 1 0 8 0
amappl8 136 110 0 109 1 0 1 1 0 8 0
amappl7 128 167 0 156 1 0 1 1 0 8 0
amappl6 120 175 0 172 1 0 1 1 0 8 0
amappl5 112 98 0 90 1 0 1 1 0 8 0
amappl4 104 298 0 282 1 0 1 1 0 8 0
amappl3 96 3489 0 3408 5 1 4 4 0 8 0
amappl2 88 562 0 508 2 0 2 2 0 8 0
amappl1 80 12117 0 11577 16 2 14 16 0 8 0
amappl 88 5186 0 5065 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 13 0 3 1 0 1 1 0 8 0
uaddrrnd 24 765 0 732 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 765 0 732 1 0 1 1 0 8 0
vmmpekpl 168 8540 0 8490 3 0 3 3 0 8 0
vmmpepl 168 58331 0 56536 104 9 95 104 0 357 6
vmsppl 488 764 0 731 7 1 6 6 0 8 0
rwobjpl 80 19548 0 18682 25 0 25 25 0 8 0
pdppl 4096 1537 0 1462 121 44 77 95 0 8 2
pvpl 32 17599 0 0 142 0 142 142 0 265 0
pmappl 256 764 0 731 4 1 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 478 0 57 13 0 13 13 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffffffff839a7ff0) 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(ffffffff83a8f2c0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83a8f2c0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173
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
__mp_lock(ffffffff83a8f2c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83a8f2c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173
syscall(ffff80003abace80) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline]
syscall(ffff80003abace80) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x738aba46a8c0, count: 5
ddb{0}> trace
x86_ipi_db(ffffffff839a7ff0) 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(ffffffff83a8f2c0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83a8f2c0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173
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
__mp_lock(ffffffff83a8f2c0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83a8f2c0) at __mp_lock+0x192 sys/kern/kern_lock.c:173
syscall(ffff80003abace80) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline]
syscall(ffff80003abace80) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x738aba46a8c0, count: -10
ddb{0}> machine ddbcpu 1
Stopped at amap_lookups+0x1e0: movl 0x10(%r15),%r14d
amap_lookups(fffff9006bbdc728,1000,ffff80003afdb3a0,8) at amap_lookups+0x1e0 amap_chunk_get sys/uvm/uvm_amap.c:118 [inline]
amap_lookups(fffff9006bbdc728,1000,ffff80003afdb3a0,8) at amap_lookups+0x1e0 sys/uvm/uvm_amap.c:1168
uvm_fault_check(ffff80003afdb4a0,ffff80003afdb4d8,ffff80003afdb510,0) at uvm_fault_check+0x8d2 sys/uvm/uvm_fault.c:840
uvm_fault(fffff9006d07e028,434f8970000,0,1) at uvm_fault+0x106 sys/uvm/uvm_fault.c:627
upageflttrap(ffff80003afdb640,434f8970e70) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80003afdb640) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7d21abf12d70, count: 9
ddb{1}> trace
amap_lookups(fffff9006bbdc728,1000,ffff80003afdb3a0,8) at amap_lookups+0x1e0 amap_chunk_get sys/uvm/uvm_amap.c:118 [inline]
amap_lookups(fffff9006bbdc728,1000,ffff80003afdb3a0,8) at amap_lookups+0x1e0 sys/uvm/uvm_amap.c:1168
uvm_fault_check(ffff80003afdb4a0,ffff80003afdb4d8,ffff80003afdb510,0) at uvm_fault_check+0x8d2 sys/uvm/uvm_fault.c:840
uvm_fault(fffff9006d07e028,434f8970000,0,1) at uvm_fault+0x106 sys/uvm/uvm_fault.c:627
upageflttrap(ffff80003afdb640,434f8970e70) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80003afdb640) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7d21abf12d70, count: -6
---
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