KASAN: invalid memory access in amap_chunk_get
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syzbot
Jul 11, 2026, 10:06:28 AMJul 11
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 275dedaf93b0 drm/amdgpu: tear down userq mgr and eviction ..
git tree: https://github.com/blackgnezdo/openbsd-src.git syzbot-kasan
console output: https://syzkaller.appspot.com/x/log.txt?x=125ceb89580000
kernel config: https://syzkaller.appspot.com/x/.config?x=85e25e37d09e1b88
dashboard link: https://syzkaller.appspot.com/bug?extid=395e2ca387211b07a4a6
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7c4ef6ece368/disk-275dedaf.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/f37413fa5768/bsd-275dedaf.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ae4a84e28f1c/kernel-275dedaf.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+395e2c...@syzkaller.appspotmail.com
panic: Caught invalid memory access at ffff800001b5eee8 size 4 op 0
Stopped at db_enter+0x17: popq %rbp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*373176 53666 0 0x2 0 1 ndp
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff846334c7) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load4_noabort(ffff800001b5eee8) at __asan_load4_noabort+0xa3
amap_chunk_get(ffff800001b5ee98,0,1,2) at amap_chunk_get+0x52 sys/uvm/uvm_amap.c:108
amap_add(ffff800001adb3e0,0,ffff800001864e30,0) at amap_add+0xda sys/uvm/uvm_amap.c:-1
uvm_fault_lower(ffff80003bb98c20,ffff80003bb98bc8,ffff80003bb98d20) at uvm_fault_lower+0x8e4 sys/uvm/uvm_fault.c:1468
uvm_fault(ffff800001afb5d8,f18b0ee1000,0,2) at uvm_fault+0x3ef sys/uvm/uvm_fault.c:657
upageflttrap(ffff80003bb98f10,f18b0ee152c) at upageflttrap+0xe0 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80003bb98f10) at usertrap+0x4f9 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x76c97e06a630, count: 5
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: Caught invalid memory access at ffff800001b5eee8 size 4 op 0
ddb{1}> trace
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff846334c7) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load4_noabort(ffff800001b5eee8) at __asan_load4_noabort+0xa3
amap_chunk_get(ffff800001b5ee98,0,1,2) at amap_chunk_get+0x52 sys/uvm/uvm_amap.c:108
amap_add(ffff800001adb3e0,0,ffff800001864e30,0) at amap_add+0xda sys/uvm/uvm_amap.c:-1
uvm_fault_lower(ffff80003bb98c20,ffff80003bb98bc8,ffff80003bb98d20) at uvm_fault_lower+0x8e4 sys/uvm/uvm_fault.c:1468
uvm_fault(ffff800001afb5d8,f18b0ee1000,0,2) at uvm_fault+0x3ef sys/uvm/uvm_fault.c:657
upageflttrap(ffff80003bb98f10,f18b0ee152c) at upageflttrap+0xe0 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80003bb98f10) at usertrap+0x4f9 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x76c97e06a630, count: -10
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff80003bb98870
rbx 0xffff80003bb988e0
rdx 0
rcx 0xffff800028ff3ff0
rax 0
r8 0x101010101010101
r9 0x8080808080808080
r10 0xffff80003bb98658
r11 0xffffffff814e1f30 x86_bus_space_io_read_1
r12 0xffffffff846334c7 db_machine_command_table+0x9b027
r13 0xffff800028ff4c08
r14 0xffff800028ff4e07
r15 0x1
rip 0xffffffff81006567 db_enter+0x17
cs 0x8
rflags 0x246
rsp 0xffff80003bb98870
ss 0
db_enter+0x17: popq %rbp
ddb{1}> show proc
PROC (ndp) tid=373176 pid=53666 tcnt=1 stat=onproc
flags process=2<EXEC> proc=0
runpri=32, usrpri=76, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff800045ffc7e0,0xffff800045ffca88
process=0xffff80003bb35830 user=0xffff80003bb8d000, vmspace=0xffff800001afb5d8
estcpu=26, cpticks=16, pctcpu=0.4, user=0, sys=15, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
7446 359777 8202 0 2 0x2 sh
98385 274902 10657 0 2 0x100002 ndp
10657 39675 20372 0 3 0x10008a sigsusp sh
*53666 373176 35044 0 7 0x2 ndp
35044 428173 89153 0 3 0x10008a sigsusp sh
93689 33948 27666 0 2 0x2 arp
24710 226380 13887 0 3 0x10008a sigsusp sh
27666 181791 89135 0 3 0x10008a sigsusp sh
17509 143617 83210 0 3 0x10008a sigsusp sh
79799 514488 17917 0 2 0x100082 arp
17917 505846 13189 0 3 0x10008a sigsusp sh
89135 511778 82360 0 3 0x82 wait syz-executor
83210 516972 82360 0 3 0x82 wait syz-executor
7304 68447 82360 0 2 0xc82 syz-executor
8202 144202 82360 0 3 0x82 wait syz-executor
89153 410669 82360 0 3 0x82 wait syz-executor
13189 193771 82360 0 3 0x82 wait syz-executor
13887 22091 82360 0 3 0x82 wait syz-executor
20372 216268 82360 0 3 0x82 wait syz-executor
82360 449337 7105 0 3 0x82 kqread syz-executor
7105 10638 28619 0 3 0x10008a sigsusp ksh
28619 97769 9810 0 3 0x98 kqread sshd-session
9810 132531 73064 0 3 0x92 kqread sshd-session
78456 475334 1 0 3 0x100083 ttyin getty
73064 187345 1 0 3 0x88 kqread sshd
57126 429169 53408 74 3 0x1100092 bpf pflogd
53408 306199 1 0 3 0x80 sbwait pflogd
97084 447375 55243 73 2 0x1100090 syslogd
55243 452335 1 0 3 0x100082 sbwait syslogd
6736 88481 1 0 3 0x100080 kqread resolvd
27929 168408 85703 77 3 0x100092 kqread dhcpleased
53888 289238 85703 77 3 0x100092 kqread dhcpleased
85703 257227 1 0 3 0x80 kqread dhcpleased
41923 322594 0 0 2 0x14200 smr
95730 488388 0 0 2 0x14200 zerothread
35324 257630 0 0 3 0x14200 aiodoned aiodoned
21069 203876 0 0 3 0x14200 syncer update
10493 124564 0 0 3 0x14200 cleaner cleaner
76846 188671 0 0 2 0x14200 reaper
96734 207000 0 0 3 0x14200 pgdaemon pagedaemon
11779 317363 0 0 3 0x14200 bored viomb
80612 509698 0 0 3 0x40014200 acpi0 acpi0
86858 437190 0 0 3 0x40014200 idle1
75513 180671 0 0 3 0x14200 bored softnet1
43428 357660 0 0 3 0x14200 bored softnet0
60924 157124 0 0 3 0x14200 smrbar systqmp
48862 486312 0 0 3 0x14200 bored systq
24634 268378 0 0 3 0x14200 tmoslp softclockmp
78187 362087 0 0 3 0x40014200 tmoslp softclock
2477 388237 0 0 7 0x40014200 idle0
1 347091 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 53666 (ndp) thread 0xffff800045ffc548 (373176)
exclusive rwlock amaplk r = 0 (0xffff800001b14b28)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x53e sys/kern/kern_rwlock.c:320
#2 uvm_fault_check+0xf69 sys/uvm/uvm_fault.c:834
#3 uvm_fault+0x1e7 sys/uvm/uvm_fault.c:627
#4 upageflttrap+0xe0 sys/arch/amd64/amd64/trap.c:192
#5 usertrap+0x4f9 sys/arch/amd64/amd64/trap.c:640
#6 recall_trap+0x8
shared rwlock vmmaplk r = 0 (0xffff800001afb6d8)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x55d sys/kern/kern_rwlock.c:413
#2 uvmfault_lookup+0x1a2 sys/uvm/uvm_fault.c:-1
#3 uvm_fault_check+0x43 sys/uvm/uvm_fault.c:693
#4 uvm_fault+0x1e7 sys/uvm/uvm_fault.c:627
#5 upageflttrap+0xe0 sys/arch/amd64/amd64/trap.c:192
#6 usertrap+0x4f9 sys/arch/amd64/amd64/trap.c:640
#7 recall_trap+0x8
Process 60924 (systqmp) thread 0xffff800045ffe000 (157124)
shared rwlock systqmp r = 0 (0xffffffff85403f18)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 taskq_thread+0x1ba sys/kern/kern_task.c:442
#2 proc_trampoline+0x10
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11050 12242K 12242K 166960K 12141 0
pcb 17 24K 24K 166960K 17 0
rtable 173 8K 9K 166960K 259 0
pf 34 22K 22K 166960K 45 0
ifaddr 35 8K 8K 166960K 37 0
ifgroup 55 2K 2K 166960K 55 0
sysctl 1 1K 13K 166960K 5 0
counters 70 42K 42K 166960K 70 0
ioctlops 0 0K 4K 166960K 1479 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1289 83K 83K 166960K 1358 0
UFS quota 1 36K 36K 166960K 1 0
UFS mount 5 44K 44K 166960K 5 0
shm 2 2K 2K 166960K 2 0
VM map 2 1K 1K 166960K 2 0
sem 2 0K 0K 166960K 2 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1734 201K 292K 166960K 11964 0
file desc 21 77K 97K 166960K 116 0
proc 69 128K 209K 166960K 523 0
subproc 72 9K 9K 166960K 72 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 20K 20K 166960K 1 0
in_multi 59 4K 4K 166960K 59 0
ether_multi 1 0K 0K 166960K 1 0
mrt 0 0K 0K 166960K 1 0
ISOFS mount 1 36K 36K 166960K 1 0
MSDOSFS mount 1 20K 20K 166960K 1 0
ttys 25 182K 182K 166960K 25 0
exec 0 0K 2K 166960K 367 0
fusefs mount 1 36K 36K 166960K 1 0
tdb 3 1K 1K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 217 248K 254K 166960K 3005 0
UVM aobj 3 4K 4K 166960K 3 0
pinsyscall 49 98K 110K 166960K 1237 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
NDP 20 1K 1K 166960K 20 0
temp 34 9162K 9172K 166960K 3745 0
kqueue 13 40K 40K 166960K 25 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 27 0 22 1 0 1 1 0 8 0
rtentry 176 79 0 1 4 0 4 4 0 8 0
unpcb 144 39 0 22 1 0 1 1 0 8 0
syncache 336 4 0 4 2 1 1 1 0 8 1
tcpcb 736 8 0 4 1 0 1 1 0 8 0
arp 136 16 0 0 1 0 1 1 0 8 0
inpcb 328 61 0 54 2 0 2 2 0 8 1
nd6 152 10 0 0 1 0 1 1 0 8 0
kcovpl 48 8 0 0 1 0 1 1 0 8 0
pfosfp 40 1428 0 1005 5 0 5 5 0 8 0
pfosfpen 112 1428 0 714 21 0 21 21 0 8 0
pfstitem 24 14 0 0 1 0 1 1 0 8 0
pfstkey 128 14 0 0 1 0 1 1 0 8 0
pfstate 448 14 0 0 2 0 2 2 0 8 0
pfrule 1360 21 0 16 2 1 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 289 0 0 19 0 19 19 0 8 0
art_table 40 290 0 0 3 0 3 3 0 8 0
art_node 32 79 0 5 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1555 0 93 92 0 92 92 0 8 0
ffsino 296 1555 0 93 113 0 113 113 0 8 0
nchpl 144 1746 0 52 63 0 63 63 0 8 0
vnodes 216 1642 0 0 92 0 92 92 0 8 0
namei 1024 5270 0 5270 2 1 1 1 0 8 1
percpumem 16 51 0 0 1 0 1 1 0 8 0
kstatmem 264 27 0 0 2 0 2 2 0 8 0
scxspl 216 6436 0 6436 4 3 1 3 1 8 1
plimitpl 152 29 0 12 1 0 1 1 0 8 0
sigapl 424 433 0 379 7 0 7 7 0 8 0
knotepl 120 52 0 0 2 0 2 2 0 8 0
kqueuepl 224 21 0 12 1 0 1 1 0 8 0
pipepl 344 126 0 99 3 0 3 3 0 8 0
fdescpl 528 417 0 382 3 0 3 3 0 8 0
filepl 160 1524 0 1313 9 0 9 9 0 8 0
lockfpl 104 6 0 4 1 0 1 1 0 8 0
lockfspl 48 4 0 2 1 0 1 1 0 8 0
sessionpl 144 24 0 15 1 0 1 1 0 8 0
pgrppl 48 32 0 15 1 0 1 1 0 8 0
ucredpl 104 82 0 69 1 0 1 1 0 8 0
zombiepl 144 382 0 379 1 0 1 1 0 8 0
processpl 1232 433 0 379 5 0 5 5 0 8 0
procpl 664 435 0 379 5 0 5 5 0 8 0
sockpl 752 127 0 98 4 0 4 4 0 8 0
mcl8k 8192 3 0 0 1 0 1 1 0 8 0
mcl4k 4096 110 0 0 14 0 14 14 0 8 0
mcl2k 2048 31 0 0 4 0 4 4 0 8 0
mextrefs 64 31 0 0 1 0 1 1 0 8 0
mtagpl 96 3 0 0 1 0 1 1 0 8 0
mbufpl 256 178 0 0 12 0 12 12 0 8 0
bufpl 272 2276 0 105 145 0 145 145 0 8 0
anonpl 32 3904 0 0 32 0 32 32 0 222 0
amapchunkpl 152 8132 0 7782 15 0 15 15 0 158 0
amappl16 200 2050 0 2044 5 1 4 5 0 8 3
amappl15 192 4 0 3 1 0 1 1 0 8 0
amappl14 184 434 0 427 1 0 1 1 0 8 0
amappl13 176 122 0 108 1 0 1 1 0 8 0
amappl12 168 656 0 625 2 0 2 2 0 8 0
amappl11 160 8 0 8 1 1 0 1 0 8 0
amappl10 152 66 0 52 1 0 1 1 0 8 0
amappl9 144 273 0 273 1 1 0 1 0 8 0
amappl8 136 95 0 94 1 0 1 1 0 8 0
amappl7 128 141 0 124 1 0 1 1 0 8 0
amappl6 120 143 0 135 1 0 1 1 0 8 0
amappl5 112 132 0 122 1 0 1 1 0 8 0
amappl4 104 281 0 260 1 0 1 1 0 8 0
amappl3 96 1347 0 1258 4 1 3 3 0 8 0
amappl2 88 527 0 461 2 0 2 2 0 8 0
amappl1 80 10189 0 9482 17 1 16 16 0 8 0
amappl 88 2318 0 2189 4 0 4 4 0 92 0
uvmvnodes 80 100 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 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 417 0 382 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 417 0 382 1 0 1 1 0 8 0
vmmpekpl 168 5532 0 5500 2 0 2 2 0 8 0
vmmpepl 168 36602 0 34729 89 0 89 89 0 357 0
vmsppl 488 416 0 379 5 0 5 5 0 8 0
rwobjpl 80 14373 0 13230 26 1 25 25 0 8 0
pdppl 4096 843 0 758 99 10 89 89 0 8 4
pvpl 32 9313 0 0 77 1 76 76 0 265 0
pmappl 256 416 0 379 3 0 3 3 0 8 0
extentpl 40 46 0 28 1 0 1 1 0 8 0
phpool 112 405 0 15 12 0 12 12 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x19: leave
x86_ipi_db(ffffffff853a2ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412
x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
acpicpu_idle() at acpicpu_idle+0x63c sys/dev/acpi/acpicpu_x86.c:-1
sched_idle(ffffffff853a2ff0) at sched_idle+0x566 sys/kern/kern_sched.c:204
end trace frame: 0x0, count: 10
ddb{0}> trace
x86_ipi_db(ffffffff853a2ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412
x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
acpicpu_idle() at acpicpu_idle+0x63c sys/dev/acpi/acpicpu_x86.c:-1
sched_idle(ffffffff853a2ff0) at sched_idle+0x566 sys/kern/kern_sched.c:204
end trace frame: 0x0, count: -5
ddb{0}> machine ddbcpu 1
Stopped at db_enter+0x17: popq %rbp
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff846334c7) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load4_noabort(ffff800001b5eee8) at __asan_load4_noabort+0xa3
amap_chunk_get(ffff800001b5ee98,0,1,2) at amap_chunk_get+0x52 sys/uvm/uvm_amap.c:108
amap_add(ffff800001adb3e0,0,ffff800001864e30,0) at amap_add+0xda sys/uvm/uvm_amap.c:-1
uvm_fault_lower(ffff80003bb98c20,ffff80003bb98bc8,ffff80003bb98d20) at uvm_fault_lower+0x8e4 sys/uvm/uvm_fault.c:1468
uvm_fault(ffff800001afb5d8,f18b0ee1000,0,2) at uvm_fault+0x3ef sys/uvm/uvm_fault.c:657
upageflttrap(ffff80003bb98f10,f18b0ee152c) at upageflttrap+0xe0 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80003bb98f10) at usertrap+0x4f9 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x76c97e06a630, count: 5
ddb{1}> trace
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff846334c7) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load4_noabort(ffff800001b5eee8) at __asan_load4_noabort+0xa3
amap_chunk_get(ffff800001b5ee98,0,1,2) at amap_chunk_get+0x52 sys/uvm/uvm_amap.c:108
amap_add(ffff800001adb3e0,0,ffff800001864e30,0) at amap_add+0xda sys/uvm/uvm_amap.c:-1
uvm_fault_lower(ffff80003bb98c20,ffff80003bb98bc8,ffff80003bb98d20) at uvm_fault_lower+0x8e4 sys/uvm/uvm_fault.c:1468
uvm_fault(ffff800001afb5d8,f18b0ee1000,0,2) at uvm_fault+0x3ef sys/uvm/uvm_fault.c:657
upageflttrap(ffff80003bb98f10,f18b0ee152c) at upageflttrap+0xe0 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80003bb98f10) at usertrap+0x4f9 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x76c97e06a630, count: -10
---
This report is generated by a bot. It may contain errors.
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If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: 275dedaf93b0 drm/amdgpu: tear down userq mgr and eviction ..
git tree: https://github.com/blackgnezdo/openbsd-src.git syzbot-kasan
console output: https://syzkaller.appspot.com/x/log.txt?x=125ceb89580000
kernel config: https://syzkaller.appspot.com/x/.config?x=85e25e37d09e1b88
dashboard link: https://syzkaller.appspot.com/bug?extid=395e2ca387211b07a4a6
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7c4ef6ece368/disk-275dedaf.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/f37413fa5768/bsd-275dedaf.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ae4a84e28f1c/kernel-275dedaf.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+395e2c...@syzkaller.appspotmail.com
panic: Caught invalid memory access at ffff800001b5eee8 size 4 op 0
Stopped at db_enter+0x17: popq %rbp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*373176 53666 0 0x2 0 1 ndp
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff846334c7) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load4_noabort(ffff800001b5eee8) at __asan_load4_noabort+0xa3
amap_chunk_get(ffff800001b5ee98,0,1,2) at amap_chunk_get+0x52 sys/uvm/uvm_amap.c:108
amap_add(ffff800001adb3e0,0,ffff800001864e30,0) at amap_add+0xda sys/uvm/uvm_amap.c:-1
uvm_fault_lower(ffff80003bb98c20,ffff80003bb98bc8,ffff80003bb98d20) at uvm_fault_lower+0x8e4 sys/uvm/uvm_fault.c:1468
uvm_fault(ffff800001afb5d8,f18b0ee1000,0,2) at uvm_fault+0x3ef sys/uvm/uvm_fault.c:657
upageflttrap(ffff80003bb98f10,f18b0ee152c) at upageflttrap+0xe0 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80003bb98f10) at usertrap+0x4f9 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x76c97e06a630, count: 5
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: Caught invalid memory access at ffff800001b5eee8 size 4 op 0
ddb{1}> trace
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff846334c7) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load4_noabort(ffff800001b5eee8) at __asan_load4_noabort+0xa3
amap_chunk_get(ffff800001b5ee98,0,1,2) at amap_chunk_get+0x52 sys/uvm/uvm_amap.c:108
amap_add(ffff800001adb3e0,0,ffff800001864e30,0) at amap_add+0xda sys/uvm/uvm_amap.c:-1
uvm_fault_lower(ffff80003bb98c20,ffff80003bb98bc8,ffff80003bb98d20) at uvm_fault_lower+0x8e4 sys/uvm/uvm_fault.c:1468
uvm_fault(ffff800001afb5d8,f18b0ee1000,0,2) at uvm_fault+0x3ef sys/uvm/uvm_fault.c:657
upageflttrap(ffff80003bb98f10,f18b0ee152c) at upageflttrap+0xe0 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80003bb98f10) at usertrap+0x4f9 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x76c97e06a630, count: -10
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff80003bb98870
rbx 0xffff80003bb988e0
rdx 0
rcx 0xffff800028ff3ff0
rax 0
r8 0x101010101010101
r9 0x8080808080808080
r10 0xffff80003bb98658
r11 0xffffffff814e1f30 x86_bus_space_io_read_1
r12 0xffffffff846334c7 db_machine_command_table+0x9b027
r13 0xffff800028ff4c08
r14 0xffff800028ff4e07
r15 0x1
rip 0xffffffff81006567 db_enter+0x17
cs 0x8
rflags 0x246
rsp 0xffff80003bb98870
ss 0
db_enter+0x17: popq %rbp
ddb{1}> show proc
PROC (ndp) tid=373176 pid=53666 tcnt=1 stat=onproc
flags process=2<EXEC> proc=0
runpri=32, usrpri=76, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff800045ffc7e0,0xffff800045ffca88
process=0xffff80003bb35830 user=0xffff80003bb8d000, vmspace=0xffff800001afb5d8
estcpu=26, cpticks=16, pctcpu=0.4, user=0, sys=15, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
7446 359777 8202 0 2 0x2 sh
98385 274902 10657 0 2 0x100002 ndp
10657 39675 20372 0 3 0x10008a sigsusp sh
*53666 373176 35044 0 7 0x2 ndp
35044 428173 89153 0 3 0x10008a sigsusp sh
93689 33948 27666 0 2 0x2 arp
24710 226380 13887 0 3 0x10008a sigsusp sh
27666 181791 89135 0 3 0x10008a sigsusp sh
17509 143617 83210 0 3 0x10008a sigsusp sh
79799 514488 17917 0 2 0x100082 arp
17917 505846 13189 0 3 0x10008a sigsusp sh
89135 511778 82360 0 3 0x82 wait syz-executor
83210 516972 82360 0 3 0x82 wait syz-executor
7304 68447 82360 0 2 0xc82 syz-executor
8202 144202 82360 0 3 0x82 wait syz-executor
89153 410669 82360 0 3 0x82 wait syz-executor
13189 193771 82360 0 3 0x82 wait syz-executor
13887 22091 82360 0 3 0x82 wait syz-executor
20372 216268 82360 0 3 0x82 wait syz-executor
82360 449337 7105 0 3 0x82 kqread syz-executor
7105 10638 28619 0 3 0x10008a sigsusp ksh
28619 97769 9810 0 3 0x98 kqread sshd-session
9810 132531 73064 0 3 0x92 kqread sshd-session
78456 475334 1 0 3 0x100083 ttyin getty
73064 187345 1 0 3 0x88 kqread sshd
57126 429169 53408 74 3 0x1100092 bpf pflogd
53408 306199 1 0 3 0x80 sbwait pflogd
97084 447375 55243 73 2 0x1100090 syslogd
55243 452335 1 0 3 0x100082 sbwait syslogd
6736 88481 1 0 3 0x100080 kqread resolvd
27929 168408 85703 77 3 0x100092 kqread dhcpleased
53888 289238 85703 77 3 0x100092 kqread dhcpleased
85703 257227 1 0 3 0x80 kqread dhcpleased
41923 322594 0 0 2 0x14200 smr
95730 488388 0 0 2 0x14200 zerothread
35324 257630 0 0 3 0x14200 aiodoned aiodoned
21069 203876 0 0 3 0x14200 syncer update
10493 124564 0 0 3 0x14200 cleaner cleaner
76846 188671 0 0 2 0x14200 reaper
96734 207000 0 0 3 0x14200 pgdaemon pagedaemon
11779 317363 0 0 3 0x14200 bored viomb
80612 509698 0 0 3 0x40014200 acpi0 acpi0
86858 437190 0 0 3 0x40014200 idle1
75513 180671 0 0 3 0x14200 bored softnet1
43428 357660 0 0 3 0x14200 bored softnet0
60924 157124 0 0 3 0x14200 smrbar systqmp
48862 486312 0 0 3 0x14200 bored systq
24634 268378 0 0 3 0x14200 tmoslp softclockmp
78187 362087 0 0 3 0x40014200 tmoslp softclock
2477 388237 0 0 7 0x40014200 idle0
1 347091 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 53666 (ndp) thread 0xffff800045ffc548 (373176)
exclusive rwlock amaplk r = 0 (0xffff800001b14b28)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x53e sys/kern/kern_rwlock.c:320
#2 uvm_fault_check+0xf69 sys/uvm/uvm_fault.c:834
#3 uvm_fault+0x1e7 sys/uvm/uvm_fault.c:627
#4 upageflttrap+0xe0 sys/arch/amd64/amd64/trap.c:192
#5 usertrap+0x4f9 sys/arch/amd64/amd64/trap.c:640
#6 recall_trap+0x8
shared rwlock vmmaplk r = 0 (0xffff800001afb6d8)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x55d sys/kern/kern_rwlock.c:413
#2 uvmfault_lookup+0x1a2 sys/uvm/uvm_fault.c:-1
#3 uvm_fault_check+0x43 sys/uvm/uvm_fault.c:693
#4 uvm_fault+0x1e7 sys/uvm/uvm_fault.c:627
#5 upageflttrap+0xe0 sys/arch/amd64/amd64/trap.c:192
#6 usertrap+0x4f9 sys/arch/amd64/amd64/trap.c:640
#7 recall_trap+0x8
Process 60924 (systqmp) thread 0xffff800045ffe000 (157124)
shared rwlock systqmp r = 0 (0xffffffff85403f18)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 taskq_thread+0x1ba sys/kern/kern_task.c:442
#2 proc_trampoline+0x10
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11050 12242K 12242K 166960K 12141 0
pcb 17 24K 24K 166960K 17 0
rtable 173 8K 9K 166960K 259 0
pf 34 22K 22K 166960K 45 0
ifaddr 35 8K 8K 166960K 37 0
ifgroup 55 2K 2K 166960K 55 0
sysctl 1 1K 13K 166960K 5 0
counters 70 42K 42K 166960K 70 0
ioctlops 0 0K 4K 166960K 1479 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1289 83K 83K 166960K 1358 0
UFS quota 1 36K 36K 166960K 1 0
UFS mount 5 44K 44K 166960K 5 0
shm 2 2K 2K 166960K 2 0
VM map 2 1K 1K 166960K 2 0
sem 2 0K 0K 166960K 2 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1734 201K 292K 166960K 11964 0
file desc 21 77K 97K 166960K 116 0
proc 69 128K 209K 166960K 523 0
subproc 72 9K 9K 166960K 72 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 20K 20K 166960K 1 0
in_multi 59 4K 4K 166960K 59 0
ether_multi 1 0K 0K 166960K 1 0
mrt 0 0K 0K 166960K 1 0
ISOFS mount 1 36K 36K 166960K 1 0
MSDOSFS mount 1 20K 20K 166960K 1 0
ttys 25 182K 182K 166960K 25 0
exec 0 0K 2K 166960K 367 0
fusefs mount 1 36K 36K 166960K 1 0
tdb 3 1K 1K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 217 248K 254K 166960K 3005 0
UVM aobj 3 4K 4K 166960K 3 0
pinsyscall 49 98K 110K 166960K 1237 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
NDP 20 1K 1K 166960K 20 0
temp 34 9162K 9172K 166960K 3745 0
kqueue 13 40K 40K 166960K 25 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 27 0 22 1 0 1 1 0 8 0
rtentry 176 79 0 1 4 0 4 4 0 8 0
unpcb 144 39 0 22 1 0 1 1 0 8 0
syncache 336 4 0 4 2 1 1 1 0 8 1
tcpcb 736 8 0 4 1 0 1 1 0 8 0
arp 136 16 0 0 1 0 1 1 0 8 0
inpcb 328 61 0 54 2 0 2 2 0 8 1
nd6 152 10 0 0 1 0 1 1 0 8 0
kcovpl 48 8 0 0 1 0 1 1 0 8 0
pfosfp 40 1428 0 1005 5 0 5 5 0 8 0
pfosfpen 112 1428 0 714 21 0 21 21 0 8 0
pfstitem 24 14 0 0 1 0 1 1 0 8 0
pfstkey 128 14 0 0 1 0 1 1 0 8 0
pfstate 448 14 0 0 2 0 2 2 0 8 0
pfrule 1360 21 0 16 2 1 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 289 0 0 19 0 19 19 0 8 0
art_table 40 290 0 0 3 0 3 3 0 8 0
art_node 32 79 0 5 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1555 0 93 92 0 92 92 0 8 0
ffsino 296 1555 0 93 113 0 113 113 0 8 0
nchpl 144 1746 0 52 63 0 63 63 0 8 0
vnodes 216 1642 0 0 92 0 92 92 0 8 0
namei 1024 5270 0 5270 2 1 1 1 0 8 1
percpumem 16 51 0 0 1 0 1 1 0 8 0
kstatmem 264 27 0 0 2 0 2 2 0 8 0
scxspl 216 6436 0 6436 4 3 1 3 1 8 1
plimitpl 152 29 0 12 1 0 1 1 0 8 0
sigapl 424 433 0 379 7 0 7 7 0 8 0
knotepl 120 52 0 0 2 0 2 2 0 8 0
kqueuepl 224 21 0 12 1 0 1 1 0 8 0
pipepl 344 126 0 99 3 0 3 3 0 8 0
fdescpl 528 417 0 382 3 0 3 3 0 8 0
filepl 160 1524 0 1313 9 0 9 9 0 8 0
lockfpl 104 6 0 4 1 0 1 1 0 8 0
lockfspl 48 4 0 2 1 0 1 1 0 8 0
sessionpl 144 24 0 15 1 0 1 1 0 8 0
pgrppl 48 32 0 15 1 0 1 1 0 8 0
ucredpl 104 82 0 69 1 0 1 1 0 8 0
zombiepl 144 382 0 379 1 0 1 1 0 8 0
processpl 1232 433 0 379 5 0 5 5 0 8 0
procpl 664 435 0 379 5 0 5 5 0 8 0
sockpl 752 127 0 98 4 0 4 4 0 8 0
mcl8k 8192 3 0 0 1 0 1 1 0 8 0
mcl4k 4096 110 0 0 14 0 14 14 0 8 0
mcl2k 2048 31 0 0 4 0 4 4 0 8 0
mextrefs 64 31 0 0 1 0 1 1 0 8 0
mtagpl 96 3 0 0 1 0 1 1 0 8 0
mbufpl 256 178 0 0 12 0 12 12 0 8 0
bufpl 272 2276 0 105 145 0 145 145 0 8 0
anonpl 32 3904 0 0 32 0 32 32 0 222 0
amapchunkpl 152 8132 0 7782 15 0 15 15 0 158 0
amappl16 200 2050 0 2044 5 1 4 5 0 8 3
amappl15 192 4 0 3 1 0 1 1 0 8 0
amappl14 184 434 0 427 1 0 1 1 0 8 0
amappl13 176 122 0 108 1 0 1 1 0 8 0
amappl12 168 656 0 625 2 0 2 2 0 8 0
amappl11 160 8 0 8 1 1 0 1 0 8 0
amappl10 152 66 0 52 1 0 1 1 0 8 0
amappl9 144 273 0 273 1 1 0 1 0 8 0
amappl8 136 95 0 94 1 0 1 1 0 8 0
amappl7 128 141 0 124 1 0 1 1 0 8 0
amappl6 120 143 0 135 1 0 1 1 0 8 0
amappl5 112 132 0 122 1 0 1 1 0 8 0
amappl4 104 281 0 260 1 0 1 1 0 8 0
amappl3 96 1347 0 1258 4 1 3 3 0 8 0
amappl2 88 527 0 461 2 0 2 2 0 8 0
amappl1 80 10189 0 9482 17 1 16 16 0 8 0
amappl 88 2318 0 2189 4 0 4 4 0 92 0
uvmvnodes 80 100 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 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 417 0 382 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 417 0 382 1 0 1 1 0 8 0
vmmpekpl 168 5532 0 5500 2 0 2 2 0 8 0
vmmpepl 168 36602 0 34729 89 0 89 89 0 357 0
vmsppl 488 416 0 379 5 0 5 5 0 8 0
rwobjpl 80 14373 0 13230 26 1 25 25 0 8 0
pdppl 4096 843 0 758 99 10 89 89 0 8 4
pvpl 32 9313 0 0 77 1 76 76 0 265 0
pmappl 256 416 0 379 3 0 3 3 0 8 0
extentpl 40 46 0 28 1 0 1 1 0 8 0
phpool 112 405 0 15 12 0 12 12 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x19: leave
x86_ipi_db(ffffffff853a2ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412
x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
acpicpu_idle() at acpicpu_idle+0x63c sys/dev/acpi/acpicpu_x86.c:-1
sched_idle(ffffffff853a2ff0) at sched_idle+0x566 sys/kern/kern_sched.c:204
end trace frame: 0x0, count: 10
ddb{0}> trace
x86_ipi_db(ffffffff853a2ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412
x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
acpicpu_idle() at acpicpu_idle+0x63c sys/dev/acpi/acpicpu_x86.c:-1
sched_idle(ffffffff853a2ff0) at sched_idle+0x566 sys/kern/kern_sched.c:204
end trace frame: 0x0, count: -5
ddb{0}> machine ddbcpu 1
Stopped at db_enter+0x17: popq %rbp
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff846334c7) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load4_noabort(ffff800001b5eee8) at __asan_load4_noabort+0xa3
amap_chunk_get(ffff800001b5ee98,0,1,2) at amap_chunk_get+0x52 sys/uvm/uvm_amap.c:108
amap_add(ffff800001adb3e0,0,ffff800001864e30,0) at amap_add+0xda sys/uvm/uvm_amap.c:-1
uvm_fault_lower(ffff80003bb98c20,ffff80003bb98bc8,ffff80003bb98d20) at uvm_fault_lower+0x8e4 sys/uvm/uvm_fault.c:1468
uvm_fault(ffff800001afb5d8,f18b0ee1000,0,2) at uvm_fault+0x3ef sys/uvm/uvm_fault.c:657
upageflttrap(ffff80003bb98f10,f18b0ee152c) at upageflttrap+0xe0 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80003bb98f10) at usertrap+0x4f9 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x76c97e06a630, count: 5
ddb{1}> trace
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff846334c7) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load4_noabort(ffff800001b5eee8) at __asan_load4_noabort+0xa3
amap_chunk_get(ffff800001b5ee98,0,1,2) at amap_chunk_get+0x52 sys/uvm/uvm_amap.c:108
amap_add(ffff800001adb3e0,0,ffff800001864e30,0) at amap_add+0xda sys/uvm/uvm_amap.c:-1
uvm_fault_lower(ffff80003bb98c20,ffff80003bb98bc8,ffff80003bb98d20) at uvm_fault_lower+0x8e4 sys/uvm/uvm_fault.c:1468
uvm_fault(ffff800001afb5d8,f18b0ee1000,0,2) at uvm_fault+0x3ef sys/uvm/uvm_fault.c:657
upageflttrap(ffff80003bb98f10,f18b0ee152c) at upageflttrap+0xe0 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80003bb98f10) at usertrap+0x4f9 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x76c97e06a630, count: -10
---
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Greg Steuck
Jul 25, 2026, 4:15:30 PM (2 days ago) Jul 25
to syzbot, syzkaller-o...@googlegroups.com
#syz invalid
The problem was fixed in KASAN code.
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