kernel: double fault trap, code=0

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syzbot

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May 16, 2019, 12:55:08 PM5/16/19
to syzkaller-o...@googlegroups.com
Hello,

syzbot found the following crash on:

HEAD commit: f42f1754 unveil "w" on ttys was too strict, introducing a ..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=14f9c2f8a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=60e2b7157576c8d7
dashboard link: https://syzkaller.appspot.com/bug?extid=afa8f7d7fe6390b90de5

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+afa8f7...@syzkaller.appspotmail.com

" " ~<t'j O qzHtD^U" " ~<t'j O qzHtD^Ukernel: double fault trap,
code=0
Stopped at ipsp_spd_lookup+0x41: callq __sanitizer_cov_trace_pc+0x4
ddb>
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
the kernel did not panic
ddb> trace
ipsp_spd_lookup(fffffd8035445300,2,14,ffff80001491324c,2,0) at
ipsp_spd_lookup+0x41 sys/netinet/ip_spd.c:149
ip_output_ipsec_lookup(fffffd8035445300,14,ffff80001491324c,fffffd803ead2118,0)
at
ip_output_ipsec_lookup+0x57 sys/netinet/ip_output.c:539
ip_output(fffffd8035445300,0,fffffd803ead2188,800,0,fffffd803ead2118) at
ip_output+0x794 sys/netinet/ip_output.c:243
tcp_output(ffff80000098f880) at tcp_output+0x2544
sys/netinet/tcp_output.c:1040
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_output(ffff80000098f880) at tcp_output+0x2880
sys/netinet/tcp_output.c:1084
tcp_usrreq(fffffd803641e008,9,fffffd8035445400,0,0,ffff8000ffff4718) at
tcp_usrreq+0x23b
sosend(fffffd803641e008,0,ffff800014916a98,0,0,80) at sosend+0x660
sys/kern/uipc_socket.c:513
dofilewritev(ffff8000ffff4718,4,ffff800014916a98,0,ffff800014916bb0) at
dofilewritev+0x1a9 sys/kern/sys_generic.c:364
sys_write(ffff8000ffff4718,ffff800014916b40,ffff800014916bb0) at
sys_write+0x83 sys/kern/sys_generic.c:284
syscall(ffff800014916c20) at syscall+0x511
Xsyscall(0,4,648a1915f06,4,4,64b9b4b29c0) at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffcff50, count: -42
ddb> show registers
rdi 0xfffffd8035445300
rsi 0x2
rbp 0xffff800014913110
rbx 0xfffffd8035445300
rdx 0x14
rcx 0xffff80001491324c
rax 0
r8 0x2
r9 0
r10 0x79948419f62286d9
r11 0xcfda9defb0dc6a1b
r12 0x14
r13 0xffff80001491324c
r14 0x2
r15 0xfffffd8035445300
rip 0xffffffff8117a5c1 ipsp_spd_lookup+0x41
cs 0x8
rflags 0x10286 __ALIGN_SIZE+0xf286
rsp 0xffff800014912ff0
ss 0x10
ipsp_spd_lookup+0x41: callq __sanitizer_cov_trace_pc+0x4
ddb> show proc
PROC (sshd) pid=519709 stat=onproc
flags process=12<EXEC,SUGID> proc=0
pri=50, usrpri=50, nice=20
forw=0xffffffffffffffff, list=0xffff8000ffff4268,0xffff8000ffff4020
process=0xffff8000149529f0 user=0xffff800014911000,
vmspace=0xfffffd803f013738
estcpu=0, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
49042 396197 93934 0 2 0x482 syz-executor.1
29908 84869 93934 0 2 0x2 syz-executor.0
76585 290934 1 0 3 0x100083 ttyin getty
26690 108993 0 0 3 0x14200 bored sosplice
93934 308772 32368 0 3 0x82 thrsleep syz-fuzzer
93934 398251 32368 0 2 0x4000082 syz-fuzzer
93934 355611 32368 0 3 0x4000082 thrsleep syz-fuzzer
93934 91273 32368 0 3 0x4000082 thrsleep syz-fuzzer
93934 221681 32368 0 3 0x4000082 thrsleep syz-fuzzer
93934 226920 32368 0 3 0x4000082 thrsleep syz-fuzzer
93934 132072 32368 0 3 0x4000082 thrsleep syz-fuzzer
93934 27622 32368 0 2 0x4000002 syz-fuzzer
32368 208718 12939 0 3 0x10008a pause ksh
*12939 519709 81980 0 7 0x12 sshd
81980 267501 1 0 3 0x80 select sshd
71683 18116 61368 73 3 0x100010 biowait syslogd
61368 450800 1 0 3 0x100082 netio syslogd
56409 97509 1 77 3 0x100090 poll dhclient
50620 224152 1 0 3 0x80 poll dhclient
71045 348811 0 0 3 0x14200 pgzero zerothread
67788 435539 0 0 3 0x14200 aiodoned aiodoned
67849 194804 0 0 3 0x14200 syncer update
59974 507757 0 0 3 0x14200 cleaner cleaner
50032 336395 0 0 3 0x14200 reaper reaper
9469 97950 0 0 3 0x14200 pgdaemon pagedaemon
84458 340679 0 0 3 0x14200 bored crynlk
68835 273295 0 0 3 0x14200 bored crypto
65121 221430 0 0 3 0x40014200 acpi0 acpi0
11428 86553 0 0 3 0x14200 bored softnet
48850 452169 0 0 3 0x14200 bored systqmp
89846 455896 0 0 3 0x14200 bored systq
91427 94542 0 0 3 0x40014200 bored softclock
4772 215192 0 0 3 0x40014200 idle0
87517 214969 0 0 3 0x14200 bored smr
1 51877 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 Kern Lim
devbuf 9496 6340K 14537K 78643K 17329 0 0
pcb 23 9K 11K 78643K 1264 0 0
rtable 108 3K 4K 78643K 978 0 0
ifaddr 52 13K 15K 78643K 334 0 0
counters 19 16K 16K 78643K 19 0 0
ioctlops 0 0K 2K 78643K 85 0 0
iov 0 0K 20K 78643K 354 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1202 76K 76K 78643K 3578 0 0
UFS quota 1 32K 32K 78643K 1 0 0
UFS mount 5 36K 36K 78643K 5 0 0
shm 2 1K 5K 78643K 44 0 0
VM map 2 0K 0K 78643K 2 0 0
sem 12 0K 1K 78643K 423 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1793 195K 288K 78643K 12537 0 0
file desc 4 9K 25K 78643K 2674 0 0
sigio 0 0K 0K 78643K 51 0 0
proc 43 30K 55K 78643K 911 0 0
subproc 64 65538K 67586K 78643K 345 0 0
NFS srvsock 1 0K 0K 78643K 1 0 0
NFS daemon 1 16K 16K 78643K 1 0 0
ip_moptions 0 0K 0K 78643K 242 0 0
in_multi 33 2K 2K 78643K 210 0 0
ether_multi 1 0K 0K 78643K 16 0 0
mrt 0 0K 0K 78643K 7 0 0
ISOFS mount 1 32K 32K 78643K 1 0 0
MSDOSFS mount 1 16K 16K 78643K 1 0 0
ttys 102 450K 450K 78643K 102 0 0
exec 0 0K 1K 78643K 455 0 0
pagedep 1 8K 8K 78643K 1 0 0
inodedep 1 32K 32K 78643K 1 0 0
newblk 1 0K 0K 78643K 1 0 0
VM swap 7 26K 26K 78643K 7 0 0
UVM amap 79 20K 38K 78643K 7129 0 0
UVM aobj 130 6K 6K 78643K 144 0 0
memdesc 1 4K 4K 78643K 1 0 0
crypto data 1 1K 1K 78643K 1 0 0
ip6_options 0 0K 0K 78643K 97 0 0
NDP 10 0K 0K 78643K 97 0 0
temp 156 2711K 3351K 78643K 11990 0 0
kqueue 0 0K 0K 78643K 20 0 0
SYN cache 2 16K 16K 78643K 2 0 0
ddb> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg
Idle
arp 64 22 0 16 1 0 1 1 0
8 0
inpcbpl 280 1152 0 1145 1 0 1 1 0
8 0
plimitpl 152 175 0 168 1 0 1 1 0
8 0
rtentry 112 133 0 89 3 1 2 2 0
8 0
syncache 264 4 0 4 1 1 0 1 0
8 0
tcpqe 32 30 0 30 1 1 0 1 0
8 0
tcpcb 544 433 0 429 1 0 1 1 0
8 0
nd6 48 30 0 24 2 1 1 1 0
8 0
ppxss 1128 53 0 53 13 12 1 1 0
8 1
art_heap8 4096 1 0 0 1 0 1 1 0
8 0
art_heap4 256 569 0 378 14 2 12 13 0
8 0
art_table 32 570 0 378 3 1 2 2 0
8 0
art_node 16 132 0 92 1 0 1 1 0
8 0
sysvmsgpl 40 8 0 0 1 0 1 1 0
8 0
semupl 112 1 0 1 1 1 0 1 0
8 0
semapl 112 421 0 411 1 0 1 1 0
8 0
shmpl 112 142 0 14 4 0 4 4 0
8 0
dirhash 1024 17 0 0 3 0 3 3 0
8 0
dino1pl 128 5520 0 4078 47 0 47 47 0
8 0
ffsino 240 5520 0 4078 86 0 86 86 0
8 0
nchpl 144 9416 0 7795 61 0 61 61 0
8 0
uvmvnodes 72 6772 0 0 124 0 124 124 0
8 0
vnodes 200 6772 0 0 357 0 357 357 0
8 0
namei 1024 29749 0 29749 3 2 1 1 0
8 1
scsiplug 64 5 0 5 4 4 0 1 0
8 0
scxspl 192 37455 0 37454 15 14 1 6 0
8 0
sigapl 432 2822 0 2810 2 0 2 2 0
8 0
futexpl 56 45109 0 45109 4 3 1 1 0
8 1
knotepl 112 695 0 676 1 0 1 1 0
8 0
kqueuepl 104 640 0 638 1 0 1 1 0
8 0
pipepl 112 1746 0 1727 5 3 2 2 0
8 1
fdescpl 424 2823 0 2810 2 0 2 2 0
8 0
filepl 120 16865 0 16771 9 4 5 5 0
8 2
lockfpl 104 865 0 865 6 5 1 1 0
8 1
lockfspl 48 313 0 313 6 5 1 1 0
8 1
sessionpl 112 27 0 17 1 0 1 1 0
8 0
pgrppl 48 61 0 51 1 0 1 1 0
8 0
ucredpl 96 3128 0 3121 1 0 1 1 0
8 0
zombiepl 144 2810 0 2809 1 0 1 1 0
8 0
processpl 840 2838 0 2809 4 0 4 4 0
8 0
procpl 600 6082 0 6046 4 0 4 4 0
8 0
sosppl 128 49 0 49 11 10 1 1 0
8 1
sockpl 384 2253 0 2236 9 5 4 4 0
8 2
mcl64k 65536 334 0 334 39 39 0 33 0
8 0
mcl16k 16384 9 0 9 4 4 0 1 0
8 0
mcl12k 12288 60 0 60 8 7 1 1 0
8 1
mcl9k 9216 30 0 30 13 12 1 1 0
8 1
mcl8k 8192 47 0 47 11 10 1 1 0
8 1
mcl4k 4096 154 0 154 5 4 1 1 0
8 1
mcl2k2 2112 14 0 14 7 6 1 1 0
8 1
mcl2k 2048 61736 0 61688 17 10 7 13 0
8 0
mtagpl 80 4 0 4 2 2 0 1 0
8 0
mbufpl 256 114987 0 114889 31 23 8 21 0
8 0
bufpl 256 14326 0 7554 424 0 424 424 0
8 0
anonpl 16 312630 0 303096 131 74 57 66 0
62 4
amapchunkpl 152 13369 0 13271 43 28 15 15 0 158
10
amappl16 192 17100 0 16461 169 136 33 46 0
8 0
amappl15 184 8 0 8 1 0 1 1 0
8 1
amappl14 176 1360 0 1356 1 0 1 1 0
8 0
amappl13 168 3 0 3 2 1 1 1 0
8 1
amappl12 160 768 0 764 1 0 1 1 0
8 0
amappl11 152 105 0 92 1 0 1 1 0
8 0
amappl10 144 568 0 566 1 0 1 1 0
8 0
amappl9 136 645 0 642 1 0 1 1 0
8 0
amappl8 128 213 0 192 1 0 1 1 0
8 0
amappl7 120 551 0 544 1 0 1 1 0
8 0
amappl6 112 87 0 79 1 0 1 1 0
8 0
amappl5 104 981 0 971 1 0 1 1 0
8 0
amappl4 96 1496 0 1470 2 1 1 2 0
8 0
amappl3 88 2980 0 2973 1 0 1 1 0
8 0
amappl2 80 23537 0 23492 2 0 2 2 0
8 0
amappl1 72 58993 0 58592 25 15 10 19 0
8 0
amappl 80 6449 0 6417 1 0 1 1 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
dma64 64 259 0 259 1 1 0 1 0
8 0
dma32 32 7 0 7 1 1 0 1 0
8 0
dma16 16 17 0 17 1 1 0 1 0
8 0
aobjpl 64 143 0 14 3 0 3 3 0
8 0
uaddrrnd 24 2823 0 2810 1 0 1 1 0
8 0
uaddrbest 32 2 0 0 1 0 1 1 0
8 0
uaddr 24 2823 0 2810 1 0 1 1 0
8 0
vmmpekpl 168 22350 0 22327 2 0 2 2 0
8 0
vmmpepl 168 295441 0 293957 199 104 95 95 0 357
20
vmsppl 264 2822 0 2810 4 2 2 2 0
8 1
pdppl 4096 5652 0 5620 8 2 6 6 0
8 1
pvpl 32 964483 0 951947 384 157 227 265 0 265
103
pmappl 200 2822 0 2810 1 0 1 1 0
8 0
extentpl 40 41 0 26 1 0 1 1 0
8 0
phpool 112 649 0 98 18 2 16 18 0
8 0


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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syzbot

unread,
Oct 25, 2019, 4:51:07 AM10/25/19
to syzkaller-o...@googlegroups.com
Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.
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