Hello,
syzbot found the following issue on:
HEAD commit: f802266ee2c9 Avoid segfaults in EVP_PKEY_CTX_free()
git tree: openbsd
console output:
https://syzkaller.appspot.com/x/log.txt?x=119b85f5700000
kernel config:
https://syzkaller.appspot.com/x/.config?x=fe55924c11e64b0a
dashboard link:
https://syzkaller.appspot.com/bug?extid=cd5f3c8ec591c4c18c28
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+cd5f3c...@syzkaller.appspotmail.com
uvm_fault(0xfffffd80770e5120, 0x4, 0, 1) -> e
kernel: page fault trap, code=0
Stopped at igmp_leavegroup+0xaf: movl 0x4(%rax),%r12d
TID PID UID PRFLAGS PFLAGS CPU COMMAND
igmp_leavegroup(ffff800000cdb200,ffff8000006b5000) at igmp_leavegroup+0xaf sys/netinet/igmp.c:512
in_delmulti(ffff800000cdb200) at in_delmulti+0xd4 sys/netinet/in.c:926
ip_freemoptions(ffff800000c0e970) at ip_freemoptions+0x4d sys/netinet/ip_output.c:1764
in_pcbdetach(fffffd8077d11d68) at in_pcbdetach+0xfc sys/netinet/in_pcb.c:585
tcp_close(ffff800000d6a2f0) at tcp_close+0x13d sys/netinet/tcp_subr.c:526
tcp_detach(fffffd806e4c6e10) at tcp_detach+0x67 sys/netinet/tcp_usrreq.c:665
soclose(fffffd806e4c6e10,0) at soclose+0x245 sys/kern/uipc_socket.c:351
soo_close(fffffd8066558b58,ffff80002164f7b0) at soo_close+0x40
fdrop(fffffd8066558b58,ffff80002164f7b0) at fdrop+0xc7 sys/kern/kern_descrip.c:1279
closef(fffffd8066558b58,ffff80002164f7b0) at closef+0x117 sys/kern/kern_descrip.c:1263
fdfree(ffff80002164f7b0) at fdfree+0xf3 sys/kern/kern_descrip.c:1195
exit1(ffff80002164f7b0,0,0,1) at exit1+0x35d sys/kern/kern_exit.c:202
sys_exit(ffff80002164f7b0,ffff800029795970,ffff8000297959d0) at sys_exit+0x16 sys/kern/kern_exit.c:95
syscall(ffff800029795a40) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585
end trace frame: 0xffff800029795ac0, count: 0
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>
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
*cpu0: uvm_fault(0xfffffd80770e5120, 0x4, 0, 1) -> e
ddb> trace
igmp_leavegroup(ffff800000cdb200,ffff8000006b5000) at igmp_leavegroup+0xaf sys/netinet/igmp.c:512
in_delmulti(ffff800000cdb200) at in_delmulti+0xd4 sys/netinet/in.c:926
ip_freemoptions(ffff800000c0e970) at ip_freemoptions+0x4d sys/netinet/ip_output.c:1764
in_pcbdetach(fffffd8077d11d68) at in_pcbdetach+0xfc sys/netinet/in_pcb.c:585
tcp_close(ffff800000d6a2f0) at tcp_close+0x13d sys/netinet/tcp_subr.c:526
tcp_detach(fffffd806e4c6e10) at tcp_detach+0x67 sys/netinet/tcp_usrreq.c:665
soclose(fffffd806e4c6e10,0) at soclose+0x245 sys/kern/uipc_socket.c:351
soo_close(fffffd8066558b58,ffff80002164f7b0) at soo_close+0x40
fdrop(fffffd8066558b58,ffff80002164f7b0) at fdrop+0xc7 sys/kern/kern_descrip.c:1279
closef(fffffd8066558b58,ffff80002164f7b0) at closef+0x117 sys/kern/kern_descrip.c:1263
fdfree(ffff80002164f7b0) at fdfree+0xf3 sys/kern/kern_descrip.c:1195
exit1(ffff80002164f7b0,0,0,1) at exit1+0x35d sys/kern/kern_exit.c:202
sys_exit(ffff80002164f7b0,ffff800029795970,ffff8000297959d0) at sys_exit+0x16 sys/kern/kern_exit.c:95
syscall(ffff800029795a40) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffc2440, count: -15
ddb> show registers
rdi 0
rsi 0
rbp 0xffff800029795580
rbx 0
rdx 0
rcx 0x1
rax 0
r8 0
r9 0
r10 0xfcd6b9463cab9dbb
r11 0x68c0fbdd318deada
r12 0
r13 0x3
r14 0xffff800000cdb200
r15 0xffff8000006b5000
rip 0xffffffff81e8d77f igmp_leavegroup+0xaf
cs 0x8
rflags 0x10246 __ALIGN_SIZE+0xf246
rsp 0xffff800029795550
ss 0x10
igmp_leavegroup+0xaf: movl 0x4(%rax),%r12d
ddb> show proc
PROC (syz-executor.4) pid=489936 stat=onproc
flags process=1008<EXITING,SINGLEEXIT> proc=2000<WEXIT>
pri=32, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff80002164e2b0,0xffff80002164efe0
process=0xffff8000265327f8 user=0xffff800029790000, vmspace=0xfffffd80770e5120
estcpu=36, cpticks=3, pctcpu=0.0
user=0, sys=1, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
50220 434427 64551 0 2 0 syz-executor.0
50220 102912 64551 0 3 0x4000080 fsleep syz-executor.0
52339 496322 13534 0 2 0 syz-executor.7
52339 400648 13534 0 3 0x4000080 fsleep syz-executor.7
38765 340153 56381 0 2 0 syz-executor.6
38765 459488 56381 0 3 0x4000080 fsleep syz-executor.6
56718 511975 79810 0 2 0x482 syz-executor.3
72409 270699 79810 0 2 0x482 syz-executor.4
64551 131269 79810 0 3 0x82 nanoslp syz-executor.0
15042 75471 79810 0 2 0x482 syz-executor.2
26435 518978 79810 0 2 0x2 syz-executor.5
13534 265413 79810 0 2 0x482 syz-executor.7
22140 283731 79810 0 2 0x482 syz-executor.1
56381 45564 79810 0 3 0x82 nanoslp syz-executor.6
58649 13698 0 0 3 0x14200 acct acct
14857 74588 1 0 3 0x100083 ttyin getty
41735 271755 0 0 3 0x14280 nfsidl nfsio
26377 443289 0 0 3 0x14280 nfsidl nfsio
83748 17279 0 0 3 0x14280 nfsidl nfsio
88368 212560 0 0 3 0x14280 nfsidl nfsio
92140 444387 0 0 3 0x14280 nfsidl nfsio
25675 276642 0 0 3 0x14280 nfsidl nfsio
60796 492826 0 0 3 0x14280 nfsidl nfsio
50760 308089 0 0 3 0x14280 nfsidl nfsio
78938 129462 0 0 3 0x14280 nfsidl nfsio
9625 55143 0 0 3 0x14280 nfsidl nfsio
80433 515350 0 0 3 0x14280 nfsidl nfsio
7452 431714 0 0 3 0x14280 nfsidl nfsio
11407 401727 0 0 3 0x14280 nfsidl nfsio
99104 460213 0 0 3 0x14280 nfsidl nfsio
91693 475634 0 0 3 0x14280 nfsidl nfsio
75074 420011 0 0 3 0x14280 nfsidl nfsio
38841 366467 0 0 3 0x14280 nfsidl nfsio
7423 478803 0 0 3 0x14280 nfsidl nfsio
91369 136267 0 0 3 0x14280 nfsidl nfsio
12761 478316 0 0 3 0x14280 nfsidl nfsio
73429 87522 0 0 3 0x14200 bored sosplice
79810 150900 74346 0 3 0x82 thrsleep syz-fuzzer
79810 62305 74346 0 2 0x4000482 syz-fuzzer
79810 289558 74346 0 3 0x4000082 thrsleep syz-fuzzer
79810 443375 74346 0 3 0x4000082 thrsleep syz-fuzzer
79810 265142 74346 0 3 0x4000082 thrsleep syz-fuzzer
79810 481462 74346 0 3 0x4000082 kqread syz-fuzzer
79810 391962 74346 0 3 0x4000082 thrsleep syz-fuzzer
79810 35604 74346 0 3 0x4000082 thrsleep syz-fuzzer
79810 368944 74346 0 3 0x4000082 thrsleep syz-fuzzer
74346 350206 68556 0 3 0x10008a sigsusp ksh
68556 358666 54718 0 3 0x9a kqread sshd
54718 193027 1 0 3 0x88 kqread sshd
50611 344503 64449 73 3 0x1100090 kqread syslogd
64449 54220 1 0 3 0x100082 netio syslogd
41986 373564 1 0 3 0x100080 kqread resolvd
12876 167000 45254 77 3 0x100092 kqread dhcpleased
84264 346207 45254 77 3 0x100092 kqread dhcpleased
45254 284492 1 0 3 0x80 kqread dhcpleased
31243 476701 0 0 3 0x14200 bored smr
19861 135169 0 0 2 0x14200 zerothread
47681 509415 0 0 3 0x14200 aiodoned aiodoned
71679 187201 0 0 3 0x14200 syncer update
18532 135506 0 0 3 0x14200 cleaner cleaner
1885 2900 0 0 3 0x14200 reaper reaper
21708 109328 0 0 3 0x14200 pgdaemon pagedaemon
32571 230640 0 0 3 0x14200 bored viomb
6368 270007 0 0 3 0x40014200 acpi0 acpi0
83794 225848 0 0 3 0x14200 bored softnet
10163 378596 0 0 3 0x14200 bored systqmp
74362 106267 0 0 3 0x14200 bored systq
59208 27792 0 0 2 0x40014200 softclock
24876 461423 0 0 3 0x40014200 idle0
1 459199 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb> show all locks
No such command
ddb> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10177 6436K 7404K 78643K 37575 0
pcb 14 22K 26K 78643K 1747 0
rtable 223 17K 20K 78643K 3531 0
ifaddr 100 24K 25K 78643K 1318 0
sysctl 3 1K 1K 78643K 3 0
counters 27 17K 17K 78643K 181 0
ioctlops 0 0K 4K 78643K 4802 0
iov 0 0K 28K 78643K 1634 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 4 0
vnodes 1481 93K 93K 78643K 11016 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 9K 78643K 103 0
VM map 2 0K 0K 78643K 2 0
sem 12 1K 1K 78643K 296 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12548 0
file desc 14 49K 85K 78643K 12668 0
sigio 0 0K 0K 78643K 166 0
proc 60 55K 71K 78643K 2216 0
subproc 104 6K 6K 78643K 719 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 2 0K 1K 78643K 11094 0
in_multi 91 5K 7K 78643K 2202 0
ether_multi 1 0K 0K 78643K 115 0
mrt 2 0K 0K 78643K 20 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 91 413K 413K 78643K 91 0
exec 0 0K 2K 78643K 3054 0
tdb 3 0K 0K 78643K 3 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 515 900K 901K 78643K 154261 0
UVM aobj 131 4K 4K 78643K 137 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 2 0K 0K 78643K 1231 0
NDP 12 0K 2K 78643K 294 0
temp 158 4765K 5071K 78643K 249829 0
kqueue 12 18K 28K 78643K 937 0
SYN cache 2 16K 16K 78643K 2 0
ddb> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
rtpcb 120 1246 0 1243 21 18 3 5 0 8 2
rtentry 112 827 0 737 4 1 3 4 0 8 0
unpcb 136 10189 0 10176 98 92 6 9 0 8 5
syncache 296 53 0 53 15 15 0 1 0 8 0
sackhl 24 1 0 1 1 1 0 1 0 8 0
tcpqe 32 14 0 14 5 5 0 1 0 8 0
tcpcb 736 14707 0 14553 341 327 14 22 0 8 0
arp 88 139 0 123 1 0 1 1 0 8 0
ipq 40 62 0 62 7 6 1 1 0 8 1
ipqe 40 280 0 280 7 6 1 1 0 8 1
inpcb 312 24394 0 24384 218 207 11 16 0 8 10
rttmr 72 3 0 3 1 1 0 1 0 8 0
ip6q 72 5 0 5 2 2 0 1 0 8 0
ip6af 40 13 0 13 2 2 0 1 0 8 0
nd6 48 199 0 179 1 0 1 1 0 8 0
pkpcb 40 31 0 31 7 7 0 1 0 8 0
kcovpl 48 55 0 47 1 0 1 1 0 8 0
ppxss 1152 54 0 54 10 10 0 1 0 8 0
pfstscr 40 77 0 62 1 0 1 1 0 8 0
pfosfp 40 17 0 14 1 0 1 1 0 8 0
pfosfpen 112 17 0 3 1 0 1 1 0 8 0
pfrktable 1344 412 0 407 4 3 1 1 0 8 0
pftag 88 17 0 11 1 0 1 1 0 8 0
pfstitem 24 110 0 87 1 0 1 1 0 8 0
pfstkey 112 178 0 169 1 0 1 1 0 8 0
pfstate 320 110 0 98 1 0 1 1 0 8 0
pfrule 1360 1058 0 1004 16 10 6 6 0 8 1
art_heap8 4096 6 0 5 4 3 1 3 0 8 0
art_heap4 256 3467 0 3074 56 28 28 33 0 8 0
art_table 32 3473 0 3079 5 1 4 5 0 8 0
art_node 16 826 0 747 1 0 1 1 0 8 0
sysvmsgpl 40 7 0 1 1 0 1 1 0 8 0
semupl 112 1 0 1 1 1 0 1 0 8 0
semapl 112 293 0 283 1 0 1 1 0 8 0
shmpl 112 134 0 6 4 0 4 4 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 19069 0 17565 95 0 95 95 0 8 0
ffsino 240 19069 0 17565 89 0 89 89 0 8 0
nchpl 144 35807 0 34188 63 1 62 63 0 8 0
uvmvnodes 80 6175 0 0 127 0 127 127 0 8 0
vnodes 224 6175 0 0 364 0 364 364 0 8 0
namei 1024 131450 0 131450 11 10 1 2 0 8 1
vcpupl 1984 196 0 0 25 0 25 25 0 8 0
vmpool 528 217 0 21 14 0 14 14 0 8 0
pfiaddrpl 120 98 0 91 7 6 1 1 0 8 0
scsiplug 72 6 0 6 2 2 0 1 0 8 0
scxspl 216 99974 0 99974 31 27 4 8 0 8 4
plimitpl 152 1204 0 1190 1 0 1 1 0 8 0
sigapl 424 12875 0 12812 9 1 8 8 0 8 0
futexpl 64 134636 0 134633 8 7 1 1 0 8 0
knotepl 120 149119 0 149039 76 69 7 11 0 8 4
kqueuepl 184 3804 0 3796 59 57 2 4 0 8 1
pipepl 304 3025 0 2997 79 71 8 12 0 8 5
fdescpl 432 12838 0 12813 4 0 4 4 0 8 0
filepl 120 107174 0 106932 145 131 14 19 0 8 6
lockfpl 104 4292 0 4289 12 11 1 2 0 8 0
lockfspl 48 1024 0 1021 1 0 1 1 0 8 0
sessionpl 144 72 0 56 1 0 1 1 0 8 0
pgrppl 48 243 0 227 1 0 1 1 0 8 0
ucredpl 96 15371 0 15358 1 0 1 1 0 8 0
zombiepl 144 12816 0 12812 7 6 1 1 0 8 0
processpl 1000 12875 0 12812 12 3 9 9 0 8 0
procpl 672 31958 0 31884 25 17 8 9 0 8 0
sosppl 168 62 0 62 14 14 0 1 0 8 0
sockpl 448 35933 0 35907 608 590 18 36 0 8 14
mcl64k 65536 496 0 496 32 31 1 1 0 8 1
mcl16k 16384 90 0 90 32 31 1 1 0 8 1
mcl12k 12288 355 0 355 34 33 1 1 0 8 1
mcl9k 9216 244 0 244 38 37 1 1 0 8 1
mcl8k 8192 727 0 727 28 27 1 1 0 8 1
mcl4k 4096 1418 0 1418 19 18 1 1 0 8 1
mcl2k2 2112 100 0 100 35 35 0 1 0 8 0
mcl2k 2048 101983 0 101928 28 19 9 10 0 8 1
mtagpl 96 3374 0 3291 25 19 6 13 0 8 0
mbufpl 256 267434 0 267129 152 121 31 76 0 8 0
bufpl 288 26889 0 20481 458 0 458 458 0 8 0
anonpl 24 3761974 0 3734721 427 240 187 188 0 188 12
amapchunkpl 152 384052 0 382881 152 102 50 54 0 158 1
amappl16 200 46986 0 46181 222 167 55 67 0 8 7
amappl15 192 5075 0 5070 1 0 1 1 0 8 0
amappl14 184 1501 0 1497 1 0 1 1 0 8 0
amappl13 176 1757 0 1755 1 0 1 1 0 8 0
amappl12 168 1400 0 1396 2 1 1 1 0 8 0
amappl11 160 580 0 566 1 0 1 1 0 8 0
amappl10 152 863 0 857 1 0 1 1 0 8 0
amappl9 144 1262 0 1257 1 0 1 1 0 8 0
amappl8 136 3773 0 3652 5 0 5 5 0 8 0
amappl7 128 2335 0 2323 1 0 1 1 0 8 0
amappl6 120 1151 0 1126 2 1 1 2 0 8 0
amappl5 112 10630 0 10615 1 0 1 1 0 8 0
amappl4 104 3940 0 3894 2 0 2 2 0 8 0
amappl3 96 2674 0 2656 1 0 1 1 0 8 0
amappl2 88 4056 0 3995 3 1 2 3 0 8 0
amappl1 80 226272 0 225733 18 5 13 18 0 8 0
amappl 88 152666 0 152385 11 3 8 8 0 92 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 72 136 0 6 3 0 3 3 0 8 0
uaddrrnd 24 13055 0 12834 2 0 2 2 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 13055 0 12834 2 0 2 2 0 8 0
vmmpekpl 168 89260 0 89178 6 2 4 4 0 8 0
vmmpepl 168 1176001 0 1173088 300 152 148 152 0 357 0
vmsppl 272 13054 0 12834 16 1 15 15 0 8 0
rwobjpl 24 288255 0 280079 54 3 51 51 0 8 0
pdppl 4096 26116 0 25864 974 714 260 260 0 8 8
pvpl 32 6055266 0 6032058 563 331 232 244 0 265 25
pmappl 216 13054 0 12834 17 4 13 13 0 8 0
extentpl 40 58 0 38 1 0 1 1 0 8 0
phpool 112 3183 0 2139 30 0 30 30 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
igmp_leavegroup(ffff800000cdb200,ffff8000006b5000) at igmp_leavegroup+0xaf sys/netinet/igmp.c:512
in_delmulti(ffff800000cdb200) at in_delmulti+0xd4 sys/netinet/in.c:926
ip_freemoptions(ffff800000c0e970) at ip_freemoptions+0x4d sys/netinet/ip_output.c:1764
in_pcbdetach(fffffd8077d11d68) at in_pcbdetach+0xfc sys/netinet/in_pcb.c:585
tcp_close(ffff800000d6a2f0) at tcp_close+0x13d sys/netinet/tcp_subr.c:526
tcp_detach(fffffd806e4c6e10) at tcp_detach+0x67 sys/netinet/tcp_usrreq.c:665
soclose(fffffd806e4c6e10,0) at soclose+0x245 sys/kern/uipc_socket.c:351
soo_close(fffffd8066558b58,ffff80002164f7b0) at soo_close+0x40
fdrop(fffffd8066558b58,ffff80002164f7b0) at fdrop+0xc7 sys/kern/kern_descrip.c:1279
closef(fffffd8066558b58,ffff80002164f7b0) at closef+0x117 sys/kern/kern_descrip.c:1263
fdfree(ffff80002164f7b0) at fdfree+0xf3 sys/kern/kern_descrip.c:1195
exit1(ffff80002164f7b0,0,0,1) at exit1+0x35d sys/kern/kern_exit.c:202
sys_exit(ffff80002164f7b0,ffff800029795970,ffff8000297959d0) at sys_exit+0x16 sys/kern/kern_exit.c:95
syscall(ffff800029795a40) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffc2440, count: -15
ddb> machine ddbcpu 1
No such command
ddb> trace
igmp_leavegroup(ffff800000cdb200,ffff8000006b5000) at igmp_leavegroup+0xaf sys/netinet/igmp.c:512
in_delmulti(ffff800000cdb200) at in_delmulti+0xd4 sys/netinet/in.c:926
ip_freemoptions(ffff800000c0e970) at ip_freemoptions+0x4d sys/netinet/ip_output.c:1764
in_pcbdetach(fffffd8077d11d68) at in_pcbdetach+0xfc sys/netinet/in_pcb.c:585
tcp_close(ffff800000d6a2f0) at tcp_close+0x13d sys/netinet/tcp_subr.c:526
tcp_detach(fffffd806e4c6e10) at tcp_detach+0x67 sys/netinet/tcp_usrreq.c:665
soclose(fffffd806e4c6e10,0) at soclose+0x245 sys/kern/uipc_socket.c:351
soo_close(fffffd8066558b58,ffff80002164f7b0) at soo_close+0x40
fdrop(fffffd8066558b58,ffff80002164f7b0) at fdrop+0xc7 sys/kern/kern_descrip.c:1279
closef(fffffd8066558b58,ffff80002164f7b0) at closef+0x117 sys/kern/kern_descrip.c:1263
fdfree(ffff80002164f7b0) at fdfree+0xf3 sys/kern/kern_descrip.c:1195
exit1(ffff80002164f7b0,0,0,1) at exit1+0x35d sys/kern/kern_exit.c:202
sys_exit(ffff80002164f7b0,ffff800029795970,ffff8000297959d0) at sys_exit+0x16 sys/kern/kern_exit.c:95
syscall(ffff800029795a40) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffc2440, count: -15
---
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