ò¬Ú‰×ok‘¶ÔAèqÏ|Ï®¥6~ÒuQ¼'äÖ‡eÇ7<´ž¤dd횤D=Û/kkiœeÿa¼‹ƒó¹¤èµ9������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������������panic:W ApRoNIolNG_c:a ScPheL _NOiTt emLO_WmaERgEicD_ OcNhe cSYk:SC mALbLu f2 pl1 0c9p45u 2f86re26e ElXisIT t 0m ao
di
fStopped at savectx+0xb1: movl $0,%gs:0x530
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*185006 41206 0 0x2 0 0 syz-executor.1
240575 64906 0 0x14000 0x200 1 softnet
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffd9c30, 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 0xfffffd8063663b00+16 0x0!=0x8bec90e919ea12cc
ddb{0}> trace
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffd9c30, count: -1
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff800022db1c40
rbx 0
rdx 0xffff800020ac3ae8
rcx 0
rax 0x3a
r8 0xffffffff81e3200f kprintf+0x16f
r9 0x1
r10 0x25
r11 0xc8a25a784fd503f6
r12 0
r13 0
r14 0xffff800020ac3ae8
r15 0
rip 0xffffffff81ce33f1 savectx+0xb1
cs 0x8
rflags 0x46
rsp 0xffff800022db1bc0
ss 0x10
savectx+0xb1: movl $0,%gs:0x530
ddb{0}> show proc
PROC (syz-executor.1) pid=185006 stat=onproc
flags process=2<EXEC> proc=0
pri=17, usrpri=79, nice=20
forw=0xffffffffffffffff, list=0xffff800020a7c4e8,0xffff800020ac3618
process=0xffff800020a91690 user=0xffff800022dac000, vmspace=0xfffffd807f000b80
estcpu=36, cpticks=2, pctcpu=1.26
user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
45261 381155 41206 0 2 0 syz-executor.1
20857 290596 0 0 3 0x14200 bored sosplice
62274 317455 60642 0 3 0x2 biowait syz-executor.0
43976 174761 1 0 3 0x100083 ttyin getty
*41206 185006 60642 0 7 0x2 syz-executor.1
60642 460804 64348 0 3 0x82 nanosleep syz-fuzzer
60642 432964 64348 0 3 0x4000082 nanosleep syz-fuzzer
60642 369947 64348 0 3 0x4000082 thrsleep syz-fuzzer
60642 411016 64348 0 3 0x4000082 thrsleep syz-fuzzer
60642 154281 64348 0 3 0x4000082 thrsleep syz-fuzzer
60642 270618 64348 0 3 0x4000082 thrsleep syz-fuzzer
60642 378298 64348 0 3 0x4000082 thrsleep syz-fuzzer
60642 123097 64348 0 3 0x4000082 kqread syz-fuzzer
60642 119082 64348 0 3 0x4000082 thrsleep syz-fuzzer
60642 495257 64348 0 3 0x4000082 thrsleep syz-fuzzer
64348 240326 19730 0 3 0x10008a pause ksh
19730 479818 44924 0 3 0x92 select sshd
44924 366322 1 0 3 0x80 select sshd
56543 312841 6608 74 3 0x100092 bpf pflogd
6608 469223 1 0 3 0x80 netio pflogd
31231 99383 51706 73 3 0x100090 kqread syslogd
51706 327586 1 0 3 0x100082 netio syslogd
53999 509818 1 77 3 0x100090 poll dhclient
30808 242752 1 0 3 0x80 poll dhclient
90787 123211 0 0 2 0x14200 zerothread
53420 397401 0 0 3 0x14200 aiodoned aiodoned
29544 457209 0 0 3 0x14200 syncer update
18436 447425 0 0 3 0x14200 cleaner cleaner
22946 509169 0 0 3 0x14200 reaper reaper
79088 314213 0 0 3 0x14200 pgdaemon pagedaemon
60203 171196 0 0 3 0x14200 bored crynlk
9298 41335 0 0 3 0x14200 bored crypto
67327 291381 0 0 3 0x40014200 acpi0 acpi0
99032 281737 0 0 3 0x40014200 idle1
64906 240575 0 0 7 0x14200 softnet
10176 114395 0 0 3 0x14200 bored systqmp
73220 124155 0 0 3 0x14200 bored systq
59870 274676 0 0 3 0x40014200 bored softclock
62372 499758 0 0 3 0x40014200 idle0
52603 29714 0 0 3 0x14200 bored smr
1 93698 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &(curpg)->mdpage.pv_mtx r = 0 (0xfffffd8006a7c218)
#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 pmap_enter+0x698 pmap_enter_pv sys/arch/amd64/amd64/pmap.c:1032 [inline]
#3 pmap_enter+0x698 sys/arch/amd64/amd64/pmap.c:2788
#4 uvm_km_kmemalloc_pla+0x355 sys/uvm/uvm_km.c:389
#5 uvm_uarea_alloc+0x51 sys/uvm/uvm_glue.c:274
#6 fork1+0x295 sys/kern/kern_fork.c:368
#7 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#7 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#8 Xsyscall+0x128
Process 62274 (syz-executor.0) thread 0xffff800020ac2eb8 (317455)
exclusive rrwlock inode r = 0 (0xfffffd806faa3c50)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1164
#1 rw_enter+0x453 sys/kern/kern_rwlock.c:309
#2 rrw_enter+0x88 sys/kern/kern_rwlock.c:453
#3 ufs_ihashins+0x45 sys/ufs/ufs/ufs_ihash.c:140
#4 ffs_vget+0x13e sys/ufs/ffs/ffs_vfsops.c:1352
#5 ffs_inode_alloc+0x1cf sys/ufs/ffs/ffs_alloc.c:392
#6 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1164
#7 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450
#8 domkdirat+0x121 sys/kern/vfs_syscalls.c:3058
#9 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#9 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#10 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd806faa30a0)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1164
#1 rw_enter+0x453 sys/kern/kern_rwlock.c:309
#2 rrw_enter+0x88 sys/kern/kern_rwlock.c:453
#3 VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615
#4 vn_lock+0x81 sys/kern/vfs_vnops.c:571
#5 vfs_lookup+0xe6 sys/kern/vfs_lookup.c:419
#6 namei+0x63c sys/kern/vfs_lookup.c:249
#7 domkdirat+0x75 sys/kern/vfs_syscalls.c:3043
#8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#9 Xsyscall+0x128
Process 41206 (syz-executor.1) thread 0xffff800020ac3ae8 (185006)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82647250)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1164
#1 syscall+0x400 mi_syscall sys/sys/syscall_mi.h:93 [inline]
#1 syscall+0x400 sys/arch/amd64/amd64/trap.c:570
#2 Xsyscall+0x128
exclusive mutex &(curpg)->mdpage.pv_mtx r = 0 (0xfffffd8006a7c218)
#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 pmap_enter+0x698 pmap_enter_pv sys/arch/amd64/amd64/pmap.c:1032 [inline]
#3 pmap_enter+0x698 sys/arch/amd64/amd64/pmap.c:2788
#4 uvm_km_kmemalloc_pla+0x355 sys/uvm/uvm_km.c:389
#5 uvm_uarea_alloc+0x51 sys/uvm/uvm_glue.c:274
#6 fork1+0x295 sys/kern/kern_fork.c:368
#7 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#7 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#8 Xsyscall+0x128
Process 64906 (softnet) thread 0xffff800020a28750 (240575)
shared rwlock netlock r = 0 (0xffffffff824fd6d8)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1164
#1 if_input_process+0x84 sys/net/if.c:941
#2 ifiq_process+0x80 sys/net/ifq.c:646
#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 9529 6429K 7396K 78643K 11690 0
pcb 13 8K 8K 78643K 289 0
rtable 113 4K 4K 78643K 363 0
ifaddr 86 17K 17K 78643K 138 0
counters 43 33K 34K 78643K 55 0
ioctlops 0 0K 4K 78643K 1500 0
iov 0 0K 16K 78643K 76 0
mount 1 1K 1K 78643K 1 0
vnodes 1230 77K 78K 78643K 1565 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 5K 78643K 14 0
VM map 2 1K 1K 78643K 2 0
sem 12 1K 1K 78643K 75 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1809 196K 290K 78643K 12766 0
file desc 5 13K 25K 78643K 447 0
sigio 0 0K 0K 78643K 11 0
proc 63 63K 95K 78643K 558 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 227 0
in_multi 76 3K 4K 78643K 144 0
ether_multi 1 0K 0K 78643K 16 0
mrt 0 0K 0K 78643K 4 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 61 281K 281K 78643K 61 0
exec 0 0K 1K 78643K 278 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 125 54K 55K 78643K 2541 0
UVM aobj 59 6K 6K 78643K 64 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 178 0
NDP 13 0K 0K 78643K 28 0
temp 137 3022K 3102K 78643K 10161 0
kqueue 3 4K 9K 78643K 47 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 9 0 2 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 80 57 0 55 1 0 1 1 0 8 0
rtentry 112 75 0 30 2 0 2 2 0 8 0
unpcb 120 341 0 331 1 0 1 1 0 8 0
syncache 264 7 0 7 3 2 1 1 0 8 1
tcpqe 32 129 0 129 2 2 0 1 0 8 0
tcpcb 544 394 0 390 2 0 2 2 0 8 1
inpcb 280 1364 0 1357 2 0 2 2 0 8 1
rttmr 72 2 0 2 2 1 1 1 0 8 1
nd6 48 9 0 6 1 0 1 1 0 8 0
ppxss 1128 1 0 1 1 1 0 1 0 8 0
pffrag 232 5 0 5 2 1 1 1 0 482 1
pffrnode 88 5 0 5 2 1 1 1 0 8 1
pffrent 40 225 0 225 2 1 1 1 0 8 1
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 53 0 7 1 0 1 1 0 8 0
pfstkey 112 53 0 7 2 0 2 2 0 8 0
pfstate 328 53 0 7 4 0 4 4 0 8 0
pfrule 1360 21 0 16 2 1 1 2 0 8 0
art_heap8 4096 2 0 0 2 0 2 2 0 8 0
art_heap4 256 340 0 130 15 1 14 15 0 8 0
art_table 32 342 0 130 2 0 2 2 0 8 0
art_node 16 72 0 31 1 0 1 1 0 8 0
sysvmsgpl 40 33 0 16 1 0 1 1 0 8 0
semupl 112 2 0 2 1 1 0 1 0 8 0
semapl 112 69 0 59 1 0 1 1 0 8 0
shmpl 112 62 0 5 2 0 2 2 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino1pl 128 2015 0 608 46 0 46 46 0 8 0
ffsino 272 2015 0 608 95 0 95 95 0 8 0
nchpl 144 2833 0 1229 61 0 61 61 0 8 0
uvmvnodes 72 2349 0 0 43 0 43 43 0 8 0
vnodes 208 2349 0 0 124 0 124 124 0 8 0
namei 1024 8389 0 8388 1 0 1 1 0 8 0
percpumem 16 38 0 6 1 0 1 1 0 8 0
vcpupl 1984 5 0 0 1 0 1 1 0 8 0
vmpool 560 9 0 4 1 0 1 1 0 8 0
scsiplug 64 1 0 1 1 1 0 1 0 8 0
scxspl 192 8468 0 8467 7 6 1 6 0 8 0
plimitpl 152 53 0 45 1 0 1 1 0 8 0
sigapl 432 644 0 629 3 1 2 3 0 8 0
futexpl 56 9441 0 9441 1 0 1 1 0 8 1
knotepl 112 126 0 107 1 0 1 1 0 8 0
kqueuepl 104 67 0 65 1 0 1 1 0 8 0
pipelkpl 48 221 0 211 1 0 1 1 0 8 0
pipepl 120 442 0 423 2 1 1 2 0 8 0
fdescpl 496 645 0 629 3 0 3 3 0 8 0
filepl 152 5085 0 4985 7 1 6 6 0 8 2
lockfpl 104 86 0 85 1 0 1 1 0 8 0
lockfspl 48 33 0 32 1 0 1 1 0 8 0
sessionpl 112 20 0 9 1 0 1 1 0 8 0
pgrppl 48 52 0 41 1 0 1 1 0 8 0
ucredpl 96 475 0 466 1 0 1 1 0 8 0
zombiepl 144 631 0 631 1 0 1 1 0 8 1
processpl 960 663 0 631 5 0 5 5 0 8 0
procpl 624 1678 0 1637 5 1 4 5 0 8 0
sosppl 128 6 0 6 1 0 1 1 0 8 1
sockpl 400 1776 0 1757 6 2 4 6 0 8 2
mcl64k 65536 16 0 0 2 0 2 2 0 8 0
mcl16k 16384 5 0 0 1 0 1 1 0 8 0
mcl12k 12288 7 0 0 1 0 1 1 0 8 0
mcl9k 9216 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 4 0 0 1 0 1 1 0 8 0
mcl4k 4096 12 0 0 2 0 2 2 0 8 0
mcl2k2 2112 2 0 0 1 0 1 1 0 8 0
mcl2k 2048 169 0 0 21 0 21 21 0 8 0
mtagpl 80 47 0 0 1 0 1 1 0 8 0
mbufpl 256 356 0 0 21 0 21 21 0 8 0
bufpl 280 5009 0 196 344 0 344 344 0 8 0
anonpl 16 70814 0 53924 70 1 69 69 0 125 0
amapchunkpl 152 5471 0 5335 26 10 16 20 0 158 9
amappl16 192 2751 0 1830 48 1 47 47 0 8 0
amappl15 184 196 0 192 1 0 1 1 0 8 0
amappl14 176 301 0 297 1 0 1 1 0 8 0
amappl12 160 4 0 3 1 0 1 1 0 8 0
amappl11 152 62 0 47 1 0 1 1 0 8 0
amappl10 144 10 0 7 1 0 1 1 0 8 0
amappl9 136 617 0 613 1 0 1 1 0 8 0
amappl8 128 147 0 118 2 0 2 2 0 8 0
amappl7 120 119 0 106 1 0 1 1 0 8 0
amappl6 112 61 0 53 1 0 1 1 0 8 0
amappl5 104 157 0 143 1 0 1 1 0 8 0
amappl4 96 911 0 879 1 0 1 1 0 8 0
amappl3 88 330 0 322 1 0 1 1 0 8 0
amappl2 80 4336 0 4266 3 1 2 3 0 8 0
amappl1 72 24295 0 23861 25 15 10 20 0 8 0
amappl 80 1958 0 1913 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 63 0 5 1 0 1 1 0 8 0
uaddrrnd 24 654 0 633 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 654 0 633 1 0 1 1 0 8 0
vmmpekpl 168 9195 0 9163 2 0 2 2 0 8 0
vmmpepl 168 86265 0 84182 136 21 115 125 0 357 18
vmsppl 368 653 0 633 2 0 2 2 0 8 0
pdppl 4096 1315 0 1271 6 0 6 6 0 8 0
pvpl 32 230323 0 210292 169 0 169 169 0 265 4
pmappl 232 653 0 633 2 0 2 2 0 8 0
extentpl 40 46 0 29 1 0 1 1 0 8 0
phpool 112 189 0 7 6 0 6 6 0 8 0