panic: pool_cache_iWtAeRmNI_mNG: agSPiLc _cNhOeTc kL:O WmEbREuDf pOlN c SpYu SCfreALeL l 1i3s7t -m20o4d0i8fi0 eEdX: ITi te0m a a
ddStopped at savectx+0xb1: movl $0,%gs:0x530
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*177406 85634 0 0x2 0 0 syz-executor.0
355344 22017 0 0x14000 0x200 1 softnet
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffce2c0, 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{0}>
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd8066c10c00+16 0x0!=0x30a60d49b0f94d9f
ddb{0}> trace
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffce2c0, count: -1
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff800023db5540
rbx 0
rdx 0xffff800020ae6c48
rcx 0
rax 0x39
r8 0xffffffff81b1c10f kprintf+0x16f
r9 0x1
r10 0x25
r11 0x6d34dbcf995ed645
r12 0
r13 0
r14 0xffff800020ae6c48
r15 0
rip 0xffffffff81e903f1 savectx+0xb1
cs 0x8
rflags 0x46
rsp 0xffff800023db54c0
ss 0x10
savectx+0xb1: movl $0,%gs:0x530
ddb{0}> show proc
PROC (syz-executor.0) pid=177406 stat=onproc
flags process=2<EXEC> proc=0
pri=77, usrpri=77, nice=20
forw=0xffffffffffffffff, list=0xffff800020a7dad8,0xffff800020ae7888
process=0xffff800020a912d0 user=0xffff800023db0000, vmspace=0xfffffd807f000b80
estcpu=36, cpticks=1, pctcpu=0.2
user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
29541 115109 0 0 3 0x14200 bored sosplice
*85634 177406 10768 0 7 0x2 syz-executor.0
96194 139440 10768 0 2 0x2 syz-executor.1
10768 253670 87985 0 3 0x82 thrsleep syz-fuzzer
10768 118680 87985 0 3 0x4000082 nanosleep syz-fuzzer
10768 516155 87985 0 3 0x4000082 thrsleep syz-fuzzer
10768 259909 87985 0 3 0x4000082 thrsleep syz-fuzzer
10768 129716 87985 0 3 0x4000082 nanosleep syz-fuzzer
10768 70965 87985 0 3 0x4000082 thrsleep syz-fuzzer
10768 479852 87985 0 3 0x4000082 thrsleep syz-fuzzer
10768 340492 87985 0 3 0x4000082 thrsleep syz-fuzzer
10768 43576 87985 0 3 0x4000082 thrsleep syz-fuzzer
10768 173479 87985 0 3 0x4000082 kqread syz-fuzzer
87985 409312 4990 0 3 0x10008a pause ksh
4990 96441 62655 0 3 0x92 select sshd
66005 287683 1 0 3 0x100083 ttyin getty
62655 116376 1 0 3 0x80 select sshd
76145 149617 2472 74 3 0x100092 bpf pflogd
2472 301165 1 0 3 0x80 netio pflogd
6838 218603 29761 73 3 0x100090 kqread syslogd
29761 221923 1 0 3 0x100082 netio syslogd
30859 366408 1 77 3 0x100090 poll dhclient
11471 9978 1 0 3 0x80 poll dhclient
59828 267992 0 0 2 0x14200 zerothread
66346 503067 0 0 3 0x14200 aiodoned aiodoned
36492 408448 0 0 3 0x14200 syncer update
79570 44509 0 0 3 0x14200 cleaner cleaner
85115 129741 0 0 3 0x14200 reaper reaper
72626 437775 0 0 3 0x14200 pgdaemon pagedaemon
27369 241727 0 0 3 0x14200 bored crynlk
63997 71238 0 0 3 0x14200 bored crypto
67852 517628 0 0 3 0x40014200 acpi0 acpi0
64425 422527 0 0 3 0x40014200 idle1
22017 355344 0 0 7 0x14200 softnet
98419 406601 0 0 3 0x14200 bored systqmp
72505 223646 0 0 3 0x14200 bored systq
83594 409759 0 0 3 0x40014200 bored softclock
83822 322283 0 0 3 0x40014200 idle0
51684 157370 0 0 3 0x14200 bored smr
1 368229 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &map->mtx r = 0 (0xffffffff82514a90)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1164
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 vm_map_lock_ln+0x60 sys/uvm/uvm_map.c:5418
#4 malloc+0x764 sys/kern/kern_malloc.c:310
#5 ktrsyscall+0x192 sys/kern/kern_ktrace.c:174
#6 syscall+0x35b mi_syscall sys/sys/syscall_mi.h:76 [inline]
#6 syscall+0x35b sys/arch/amd64/amd64/trap.c:570
#7 Xsyscall+0x128
exclusive mutex /syzkaller/managers/multicore/kernel/sys/kern/kern_malloc.c:104 r = 0 (0xffffffff82480af0)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1164
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 malloc+0x23b sys/kern/kern_malloc.c:209
#4 ktrsyscall+0x192 sys/kern/kern_ktrace.c:174
#5 syscall+0x35b mi_syscall sys/sys/syscall_mi.h:76 [inline]
#5 syscall+0x35b sys/arch/amd64/amd64/trap.c:570
#6 Xsyscall+0x128
Process 85634 (syz-executor.0) thread 0xffff800020ae6c48 (177406)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82667478)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1164
#1 syscall+0x348 mi_syscall sys/sys/syscall_mi.h:75 [inline]
#1 syscall+0x348 sys/arch/amd64/amd64/trap.c:570
#2 Xsyscall+0x128
exclusive mutex &map->mtx r = 0 (0xffffffff82514a90)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1164
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 vm_map_lock_ln+0x60 sys/uvm/uvm_map.c:5418
#4 malloc+0x764 sys/kern/kern_malloc.c:310
#5 ktrsyscall+0x192 sys/kern/kern_ktrace.c:174
#6 syscall+0x35b mi_syscall sys/sys/syscall_mi.h:76 [inline]
#6 syscall+0x35b sys/arch/amd64/amd64/trap.c:570
#7 Xsyscall+0x128
exclusive mutex /syzkaller/managers/multicore/kernel/sys/kern/kern_malloc.c:104 r = 0 (0xffffffff82480af0)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1164
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 malloc+0x23b sys/kern/kern_malloc.c:209
#4 ktrsyscall+0x192 sys/kern/kern_ktrace.c:174
#5 syscall+0x35b mi_syscall sys/sys/syscall_mi.h:76 [inline]
#5 syscall+0x35b sys/arch/amd64/amd64/trap.c:570
#6 Xsyscall+0x128
Process 22017 (softnet) thread 0xffff800020a28270 (355344)
shared rwlock netlock r = 0 (0xffffffff824c4708)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1164
#1 if_input_process+0x84 sys/net/if.c:942
#2 ifiq_process+0x80 sys/net/ifq.c:607
#3 taskq_thread+0x9c sys/kern/kern_task.c:369
#4 proc_trampoline+0x1c
shared rwlock softnet r = 0 (0xffff80000002b0e0)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1164
#1 taskq_thread+0x8f sys/kern/kern_task.c:368
#2 proc_trampoline+0x1c
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 9518 6423K 7175K 78643K 11090 0
pcb 13 8K 8K 78643K 63 0
rtable 105 3K 3K 78643K 279 0
ifaddr 73 14K 14K 78643K 98 0
counters 39 33K 33K 78643K 39 0
ioctlops 0 0K 4K 78643K 1476 0
iov 0 0K 24K 78643K 73 0
mount 1 1K 1K 78643K 1 0
vnodes 1227 77K 77K 78643K 1372 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 5K 78643K 4 0
VM map 2 1K 1K 78643K 2 0
sem 12 0K 0K 78643K 46 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1809 196K 290K 78643K 12766 0
file desc 4 9K 25K 78643K 235 0
sigio 0 0K 0K 78643K 12 0
proc 60 63K 95K 78643K 484 0
subproc 32 2K 2K 78643K 51 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 18 0
in_multi 46 2K 2K 78643K 72 0
ether_multi 1 0K 0K 78643K 5 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 49 228K 228K 78643K 49 0
exec 0 0K 1K 78643K 237 0
pagedep 1 8K 8K 78643K 1 0
inodedep 1 32K 32K 78643K 1 0
newblk 1 0K 0K 78643K 1 0
VM swap 7 26K 26K 78643K 7 0
UVM amap 118 22K 38K 78643K 1790 0
UVM aobj 10 2K 2K 78643K 10 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 31 0
NDP 12 0K 0K 78643K 22 0
temp 131 3018K 3083K 78643K 10065 0
kqueue 3 4K 14K 78643K 34 0
SYN cache 2 16K 16K 78643K 2 0
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
arp 64 8 0 2 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 80 33 0 31 1 0 1 1 0 8 0
rtentry 112 59 0 15 2 0 2 2 0 8 0
unpcb 120 214 0 204 2 0 2 2 0 8 1
syncache 264 13 0 13 3 3 0 1 0 8 0
tcpqe 32 66 0 66 1 1 0 1 0 8 0
tcpcb 544 123 0 117 1 0 1 1 0 8 0
inpcb 280 486 0 477 2 0 2 2 0 8 1
nd6 48 7 0 3 1 0 1 1 0 8 0
pffrag 232 2 0 2 1 1 0 1 0 482 0
pffrnode 88 2 0 2 1 1 0 1 0 8 0
pffrent 40 47 0 47 1 1 0 1 0 8 0
pfosfp 40 846 0 423 5 0 5 5 0 8 0
pfosfpen 112 1428 0 714 21 0 21 21 0 8 0
pfstitem 24 32 0 6 1 0 1 1 0 8 0
pfstkey 112 32 0 6 1 0 1 1 0 8 0
pfstate 328 32 0 6 3 0 3 3 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 256 280 0 67 14 0 14 14 0 8 0
art_table 32 281 0 67 2 0 2 2 0 8 0
art_node 16 58 0 18 1 0 1 1 0 8 0
sysvmsgpl 40 32 0 19 1 0 1 1 0 8 0
semupl 112 2 0 2 1 1 0 1 0 8 0
semapl 112 40 0 30 1 0 1 1 0 8 0
shmpl 112 8 0 0 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino1pl 128 1716 0 308 46 0 46 46 0 8 0
ffsino 272 1716 0 308 95 0 95 95 0 8 0
nchpl 144 2262 0 663 61 0 61 61 0 8 0
uvmvnodes 72 1880 0 0 35 0 35 35 0 8 0
vnodes 208 1880 0 0 99 0 99 99 0 8 0
namei 1024 6189 0 6189 1 0 1 1 0 8 1
percpumem 16 30 0 0 1 0 1 1 0 8 0
vmpool 560 2 0 2 1 0 1 1 0 8 1
scxspl 192 6630 0 6630 8 7 1 7 0 8 1
plimitpl 152 35 0 27 1 0 1 1 0 8 0
sigapl 432 431 0 417 3 1 2 3 0 8 0
futexpl 56 3860 0 3860 1 0 1 1 0 8 1
knotepl 112 101 0 82 1 0 1 1 0 8 0
kqueuepl 104 60 0 58 1 0 1 1 0 8 0
pipelkpl 48 196 0 186 1 0 1 1 0 8 0
pipepl 120 392 0 373 2 1 1 2 0 8 0
fdescpl 496 432 0 417 3 0 3 3 0 8 0
filepl 152 3000 0 2899 7 1 6 6 0 8 1
lockfpl 104 119 0 118 1 0 1 1 0 8 0
lockfspl 48 33 0 32 1 0 1 1 0 8 0
sessionpl 112 19 0 8 1 0 1 1 0 8 0
pgrppl 48 21 0 10 1 0 1 1 0 8 0
ucredpl 96 229 0 220 1 0 1 1 0 8 0
zombiepl 144 417 0 417 1 0 1 1 0 8 1
processpl 960 448 0 417 5 0 5 5 0 8 0
procpl 624 954 0 914 4 0 4 4 0 8 0
sockpl 400 750 0 729 6 0 6 6 0 8 3
mcl64k 65536 5 0 0 1 0 1 1 0 8 0
mcl12k 12288 3 0 0 1 0 1 1 0 8 0
mcl9k 9216 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 3 0 0 1 0 1 1 0 8 0
mcl4k 4096 5 0 0 1 0 1 1 0 8 0
mcl2k 2048 163 0 0 20 0 20 20 0 8 0
mtagpl 80 26 0 0 1 0 1 1 0 8 0
mbufpl 256 362 0 0 22 0 22 22 0 8 0
bufpl 280 6861 0 1340 395 0 395 395 0 8 0
anonpl 16 60243 0 44392 82 1 81 81 0 125 16
amapchunkpl 152 3124 0 2994 20 7 13 19 0 158 6
amappl16 192 2019 0 1166 55 4 51 55 0 8 8
amappl15 184 162 0 156 1 0 1 1 0 8 0
amappl14 176 42 0 38 1 0 1 1 0 8 0
amappl12 160 28 0 26 2 1 1 1 0 8 0
amappl11 152 60 0 45 1 0 1 1 0 8 0
amappl10 144 106 0 98 1 0 1 1 0 8 0
amappl9 136 618 0 615 1 0 1 1 0 8 0
amappl8 128 131 0 105 1 0 1 1 0 8 0
amappl7 120 201 0 188 1 0 1 1 0 8 0
amappl6 112 59 0 52 1 0 1 1 0 8 0
amappl5 104 138 0 124 1 0 1 1 0 8 0
amappl4 96 685 0 655 1 0 1 1 0 8 0
amappl3 88 123 0 115 1 0 1 1 0 8 0
amappl2 80 2573 0 2507 3 1 2 3 0 8 0
amappl1 72 19715 0 19282 27 17 10 21 0 8 0
amappl 80 1217 0 1176 2 0 2 2 0 84 0
dma4096 4096 1 0 1 1 1 0 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 64 9 0 0 1 0 1 1 0 8 0
uaddrrnd 24 434 0 419 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 434 0 419 1 0 1 1 0 8 0
vmmpekpl 168 7841 0 7803 2 0 2 2 0 8 0
vmmpepl 168 61417 0 59492 134 16 118 122 0 357 27
vmsppl 368 433 0 419 2 0 2 2 0 8 0
pdppl 4096 875 0 838 6 0 6 6 0 8 1
pvpl 32 191632 0 172689 198 1 197 197 0 265 43
pmappl 232 433 0 419 3 1 2 2 0 8 1
extentpl 40 46 0 29 1 0 1 1 0 8 0
phpool 112 182 0 3 6 0 6 6 0 8 0