kernel: protection fault trap, code=NUM (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: ad110f3f2f3f In the next major bump, some BN macros will b..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=16350e55b00000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=8648d6bf4a1e8b1c0b99

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+8648d6...@syzkaller.appspotmail.com

kernel: protection fault trap, code=0
Stopped at __llvm_retpoline_r11+0x14: ret
ddb{0}>
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
the kernel did not panic
ddb{0}> trace
__llvm_retpoline_r11() at __llvm_retpoline_r11+0x14
rt_clone(ffff8000294cb348,fffffd806f6b9ec0,0) at rt_clone+0x78 sys/net/route.c:266
rtalloc_mpath(fffffd806f6b9ec0,0,0) at rtalloc_mpath+0xb9 rt_match sys/net/route.c:244 [inline]
rtalloc_mpath(fffffd806f6b9ec0,0,0) at rtalloc_mpath+0xb9 sys/net/route.c:359
in_pcbselsrc(ffff8000294cb428,fffffd805d4bc020,fffffd806f6b9e40) at in_pcbselsrc+0x218 sys/netinet/in_pcb.c:945
in_pcbconnect(fffffd806f6b9e40,fffffd805d4bc000) at in_pcbconnect+0xf7 sys/netinet/in_pcb.c:497
udp_usrreq(fffffd807f56d978,4,0,fffffd805d4bc000,0,ffff800021232d20) at udp_usrreq+0x573
sys_connect(ffff800021232d20,ffff8000294cb5a8,ffff8000294cb5f0) at sys_connect+0x1da sys/kern/uipc_syscalls.c:378
syscall(ffff8000294cb670) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000294cb670) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x5148e474710, count: -9
ddb{0}> show registers
rdi 0xffff800000cd3000
rsi 0xb
rbp 0xffff8000294cb220
rbx 0xffff8000294cb2d8
rdx 0xfffffd8060e5fb68
rcx 0x4b4
rax 0xffffffff810c82bb rtrequest+0x9fb
r8 0xffffffff8115f87e witness_assert+0x1fe
r9 0x5
r10 0x6596d77733873e61
r11 0xda692a7b026bfd8f
r12 0xfffffd8060e5fb68
r13 0xffff8000294cb238
r14 0xfffffd8060e5fb68
r15 0xffff800000b9a160
rip 0xffffffff81004214 __llvm_retpoline_r11+0x14
cs 0x8
rflags 0x10246 __ALIGN_SIZE+0xf246
rsp 0xffff8000294cb120
ss 0x10
__llvm_retpoline_r11+0x14: ret
ddb{0}> show proc
PROC (syz-executor.0) pid=222185 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=32, usrpri=76, nice=20
forw=0xffffffffffffffff, list=0xffff800021233a40,0xffffffff829f24e0
process=0xffff800029733260 user=0xffff8000294c6000, vmspace=0xfffffd80604d18a8
estcpu=36, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
54173 484069 60942 0 2 0 syz-executor.0
*54173 222185 60942 0 7 0x4000000 syz-executor.0
60942 490155 12602 0 3 0x82 nanoslp syz-executor.0
94327 508149 0 0 3 0x14200 acct acct
99027 213927 12602 0 2 0x2 syz-executor.1
79140 315147 1 0 3 0x100083 ttyin getty
34272 18466 0 0 3 0x14200 bored sosplice
12602 103814 14296 0 3 0x82 thrsleep syz-fuzzer
12602 77850 14296 0 3 0x4000082 nanoslp syz-fuzzer
12602 128009 14296 0 3 0x4000082 kqread syz-fuzzer
12602 20521 14296 0 3 0x4000082 thrsleep syz-fuzzer
12602 294386 14296 0 3 0x4000082 thrsleep syz-fuzzer
12602 377118 14296 0 3 0x4000082 thrsleep syz-fuzzer
12602 112686 14296 0 3 0x4000082 thrsleep syz-fuzzer
12602 274718 14296 0 3 0x4000082 thrsleep syz-fuzzer
12602 147799 14296 0 3 0x4000082 nanoslp syz-fuzzer
14296 200692 33890 0 3 0x10008a sigsusp ksh
33890 200363 38325 0 3 0x9a kqread sshd
38325 455830 1 0 3 0x88 kqread sshd
49528 103121 75321 74 3 0x100092 bpf pflogd
75321 319559 1 0 3 0x80 netio pflogd
81264 102721 49607 73 3 0x100090 kqread syslogd
49607 55355 1 0 3 0x100082 netio syslogd
15820 473830 1 0 3 0x100080 kqread resolvd
13396 378887 24950 77 3 0x100092 kqread dhcpleased
71508 237723 24950 77 3 0x100092 kqread dhcpleased
24950 320664 1 0 3 0x80 kqread dhcpleased
34305 339746 0 0 3 0x14200 bored smr
49653 319698 0 0 2 0x14200 zerothread
53608 419105 0 0 3 0x14200 aiodoned aiodoned
22211 341508 0 0 3 0x14200 syncer update
17304 89421 0 0 3 0x14200 cleaner cleaner
99724 287515 0 0 3 0x14200 reaper reaper
90308 82011 0 0 3 0x14200 pgdaemon pagedaemon
72164 199545 0 0 3 0x14200 bored viomb
34940 468908 0 0 3 0x40014200 acpi0 acpi0
14604 183556 0 0 7 0x40014200 idle1
77712 155357 0 0 3 0x14200 bored softnet
14245 270079 0 0 3 0x14200 bored systqmp
63482 277124 0 0 3 0x14200 bored systq
55080 445521 0 0 3 0x40014200 bored softclock
47345 86708 0 0 3 0x40014200 idle0
1 137926 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 54173 (syz-executor.0) thread 0xffff800021232d20 (222185)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829f8c18)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 rt_clone+0x5c sys/net/route.c:266
#2 rtalloc_mpath+0xb9 rt_match sys/net/route.c:244 [inline]
#2 rtalloc_mpath+0xb9 sys/net/route.c:359
#3 in_pcbselsrc+0x218 sys/netinet/in_pcb.c:945
#4 in_pcbconnect+0xf7 sys/netinet/in_pcb.c:497
#5 udp_usrreq+0x573
#6 sys_connect+0x1da sys/kern/uipc_syscalls.c:378
#7 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#7 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
#8 Xsyscall+0x128
exclusive rwlock netlock r = 0 (0xffffffff827d4c70)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 solock+0x86 sys/kern/uipc_socket2.c:295
#2 sys_connect+0x18d sys/kern/uipc_syscalls.c:368
#3 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#3 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
#4 Xsyscall+0x128
Process 99027 (syz-executor.1) thread 0xffff8000297a3cf0 (213927)
exclusive rrwlock inode r = 0 (0xfffffd806e0b2e68)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 rw_enter+0x3e2 sys/kern/kern_rwlock.c:310
#2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461
#3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534
#4 vn_lock+0x84 sys/kern/vfs_vnops.c:579
#5 vget+0x1eb sys/kern/vfs_subr.c:677
#6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119
#7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1318
#8 ufs_lookup+0x145f sys/ufs/ufs/ufs_lookup.c:487
#9 VOP_LOOKUP+0x58 sys/kern/vfs_vops.c:85
#10 vfs_lookup+0x737 sys/kern/vfs_lookup.c:561
#11 namei+0x55a sys/kern/vfs_lookup.c:245
#12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1849
#13 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#13 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
#14 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd805d6a1098)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 rw_enter+0x3e2 sys/kern/kern_rwlock.c:310
#2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461
#3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534
#4 vn_lock+0x84 sys/kern/vfs_vnops.c:579
#5 vfs_lookup+0xdd sys/kern/vfs_lookup.c:413
#6 namei+0x55a sys/kern/vfs_lookup.c:245
#7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1849
#8 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#8 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
#9 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10181 6852K 7695K 78643K 133167 0
pcb 13 8K 8K 78643K 4498 0
rtable 125 17K 18K 78643K 8361 0
ifaddr 64 26K 34K 78643K 3415 0
sysctl 3 1K 2K 78643K 20 0
counters 44 34K 34K 78643K 1330 0
ioctlops 0 0K 4K 78643K 6420 0
iov 0 0K 32K 78643K 2463 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 5 0
vnodes 1271 80K 80K 78643K 36924 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 5K 78643K 347 0
VM map 2 1K 1K 78643K 2 0
sem 12 0K 0K 78643K 4767 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12598 0
file desc 5 13K 25K 78643K 35319 0
sigio 0 0K 0K 78643K 247 0
proc 93 88K 112K 78643K 5636 0
subproc 66 4K 4K 78643K 3943 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 3248 0
in_multi 30 2K 2K 78643K 4432 0
ether_multi 1 0K 0K 78643K 762 0
mrt 1 0K 0K 78643K 150 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 133 599K 599K 78643K 133 0
exec 0 0K 2K 78643K 5236 0
pfkey data 0 0K 1K 78643K 60 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 1038 3496K 3496K 78643K 427948 0
UVM aobj 131 4K 4K 78643K 160 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 1K 78643K 4018 0
NDP 7 0K 0K 78643K 1086 0
temp 92 4206K 8302K 78643K 397348 0
kqueue 17 28K 40K 78643K 2231 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
plcache 128 22 0 0 1 0 1 1 0 8 0
rtpcb 120 2331 0 2328 1 0 1 1 0 8 0
rtentry 112 2950 0 2914 2 0 2 2 0 8 0
unpcb 128 17479 0 17464 44 43 1 2 0 8 0
syncache 296 21 0 21 8 8 0 1 0 8 0
sackhl 24 1 0 1 1 1 0 1 0 8 0
tcpqe 32 5 0 5 3 3 0 1 0 8 0
tcpcb 736 9137 0 9121 94 92 2 5 0 8 0
arp 120 408 0 402 1 0 1 1 0 8 0
inpcb 304 29296 0 29288 76 74 2 2 0 8 1
rttmr 72 6 0 6 3 3 0 1 0 8 0
nd6 48 640 0 634 5 4 1 1 0 8 0
pkpcb 40 242 0 242 83 82 1 1 0 8 1
kcovpl 48 119 0 117 1 0 1 1 0 8 0
ppxss 1248 218 0 218 61 60 1 1 0 8 1
pffrag 232 190 0 190 24 24 0 1 0 482 0
pffrnode 88 190 0 190 24 24 0 1 0 8 0
pffrent 40 2140 0 2140 25 25 0 1 0 8 0
pfosfp 40 1432 0 1007 5 0 5 5 0 8 0
pfosfpen 112 1432 0 716 21 0 21 21 0 8 0
pfrktable 1344 66 0 56 5 4 1 2 0 8 0
pftag 88 5 0 2 2 1 1 1 0 8 0
pfqueue 264 1 0 1 1 1 0 1 0 8 0
pfstitem 24 28 0 26 1 0 1 1 0 8 0
pfstkey 112 28 0 26 1 0 1 1 0 8 0
pfstate 320 28 0 26 2 1 1 2 0 8 0
pfrule 1360 168 0 132 5 1 4 4 0 8 0
art_heap8 4096 30 0 29 23 21 2 3 0 8 1
art_heap4 256 16399 0 16231 152 141 11 15 0 8 0
art_table 32 16429 0 16260 12 10 2 2 0 8 0
art_node 16 2815 0 2786 1 0 1 1 0 8 0
sysvmsgpl 40 30 0 24 1 0 1 1 0 8 0
semupl 112 1 0 1 1 1 0 1 0 8 0
semapl 112 4762 0 4752 1 0 1 1 0 8 0
shmpl 112 157 0 29 4 0 4 4 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 46228 0 44720 95 0 95 95 0 8 0
ffsino 272 46228 0 44720 104 3 101 101 0 8 0
nchpl 144 99024 0 97416 61 0 61 61 0 8 0
uvmvnodes 72 6185 0 0 113 0 113 113 0 8 0
vnodes 224 6185 0 0 364 0 364 364 0 8 0
namei 1024 319984 0 319984 36 35 1 1 0 8 1
percpumem 16 677 0 643 1 0 1 1 0 8 0
vcpupl 2048 362 0 7 45 0 45 45 0 8 0
vmpool 560 417 0 62 29 3 26 26 0 8 0
pfiaddrpl 120 21 0 13 1 0 1 1 0 8 0
scsiplug 72 26 0 26 15 15 0 1 0 8 0
scxspl 216 277283 0 277283 92 91 1 8 0 8 1
plimitpl 152 2183 0 2174 1 0 1 1 0 8 0
sigapl 424 35326 0 35292 11 6 5 7 0 8 0
futexpl 64 548850 0 548850 34 33 1 1 0 8 1
knotepl 112 358 0 0 3 0 3 3 0 8 0
kqueuepl 216 7776 0 7745 25 22 3 3 0 8 1
pipepl 336 4738 0 4728 22 20 2 3 0 8 1
fdescpl 496 35219 0 35201 3 0 3 3 0 8 0
filepl 152 209569 0 209422 46 39 7 8 0 8 1
lockfpl 104 9129 0 9127 1 0 1 1 0 8 0
lockfspl 48 3221 0 3219 1 0 1 1 0 8 0
sessionpl 144 151 0 140 1 0 1 1 0 8 0
pgrppl 48 246 0 235 1 0 1 1 0 8 0
ucredpl 96 24203 0 24187 1 0 1 1 0 8 0
zombiepl 144 35292 0 35292 7 6 1 1 0 8 1
processpl 1072 35326 0 35292 5 1 4 4 0 8 0
procpl 672 84720 0 84677 9 4 5 6 0 8 0
srpgc 96 56 0 56 27 27 0 1 0 8 0
sosppl 168 347 0 347 90 89 1 1 0 8 1
sockpl 480 49487 0 49461 126 121 5 8 0 8 1
mcl64k 65536 45 0 0 4 1 3 3 0 8 0
mcl16k 16384 28 0 0 4 2 2 3 0 8 0
mcl12k 12288 25 0 0 2 0 2 2 0 8 0
mcl9k 9216 40 0 0 3 1 2 2 0 8 0
mcl8k 8192 33 0 0 3 0 3 3 0 8 0
mcl4k 4096 40 0 0 3 0 3 3 0 8 0
mcl2k2 2112 25 0 0 2 0 2 2 0 8 0
mcl2k 2048 569 0 0 48 5 43 43 0 8 0
mtagpl 96 654 0 0 9 5 4 9 0 8 0
mbufpl 256 2820 0 0 64 0 64 64 0 8 0
bufpl 280 65933 0 59604 453 0 453 453 0 8 0
anonpl 24 9730489 0 9712258 457 331 126 156 0 186 0
amapchunkpl 152 1051683 0 1050905 677 645 32 52 0 158 0
amappl16 200 79069 0 78297 364 322 42 60 0 8 1
amappl15 192 5640 0 5633 1 0 1 1 0 8 0
amappl14 184 4035 0 4029 1 0 1 1 0 8 0
amappl13 176 4523 0 4522 1 0 1 1 0 8 0
amappl12 168 4151 0 4149 1 0 1 1 0 8 0
amappl11 160 4936 0 4918 1 0 1 1 0 8 0
amappl10 152 4566 0 4559 1 0 1 1 0 8 0
amappl9 144 5036 0 5033 1 0 1 1 0 8 0
amappl8 136 7334 0 7121 8 0 8 8 0 8 0
amappl7 128 4664 0 4653 1 0 1 1 0 8 0
amappl6 120 5328 0 5303 1 0 1 1 0 8 0
amappl5 112 30397 0 30372 1 0 1 1 0 8 0
amappl4 104 12298 0 12263 2 1 1 2 0 8 0
amappl3 96 8897 0 8878 1 0 1 1 0 8 0
amappl2 88 42400 0 42273 5 2 3 3 0 8 0
amappl1 80 588754 0 588307 14 4 10 13 0 8 0
amappl 88 424326 0 423868 13 2 11 11 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 64 159 0 29 3 0 3 3 0 8 0
uaddrrnd 24 35636 0 35263 4 1 3 3 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 35636 0 35263 4 1 3 3 0 8 0
vmmpekpl 168 176910 0 176849 6 2 4 4 0 8 0
vmmpepl 168 3158887 0 3155867 1652 1478 174 174 0 357 37
vmsppl 368 35635 0 35263 37 3 34 34 0 8 0
rwobjpl 56 717232 0 715149 116 86 30 33 0 8 0
pdppl 4096 71280 0 70881 550 149 401 401 0 8 2
pvpl 32 16528654 0 16508365 794 610 184 236 0 265 0
pmappl 224 35635 0 35263 24 2 22 22 0 8 0
extentpl 40 58 0 40 1 0 1 1 0 8 0
phpool 112 1295 0 475 26 2 24 24 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
__llvm_retpoline_r11() at __llvm_retpoline_r11+0x14
rt_clone(ffff8000294cb348,fffffd806f6b9ec0,0) at rt_clone+0x78 sys/net/route.c:266
rtalloc_mpath(fffffd806f6b9ec0,0,0) at rtalloc_mpath+0xb9 rt_match sys/net/route.c:244 [inline]
rtalloc_mpath(fffffd806f6b9ec0,0,0) at rtalloc_mpath+0xb9 sys/net/route.c:359
in_pcbselsrc(ffff8000294cb428,fffffd805d4bc020,fffffd806f6b9e40) at in_pcbselsrc+0x218 sys/netinet/in_pcb.c:945
in_pcbconnect(fffffd806f6b9e40,fffffd805d4bc000) at in_pcbconnect+0xf7 sys/netinet/in_pcb.c:497
udp_usrreq(fffffd807f56d978,4,0,fffffd805d4bc000,0,ffff800021232d20) at udp_usrreq+0x573
sys_connect(ffff800021232d20,ffff8000294cb5a8,ffff8000294cb5f0) at sys_connect+0x1da sys/kern/uipc_syscalls.c:378
syscall(ffff8000294cb670) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000294cb670) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x5148e474710, count: -9
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
ddb{1}> trace
x86_ipi_db(ffff800020d38ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
acpicpu_idle() at acpicpu_idle+0x2eb sys/dev/acpi/acpicpu.c:1206
sched_idle(ffff800020d38ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178
end trace frame: 0x0, count: -5


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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syzbot will keep track of this issue. See:
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[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 9d2191b71eea regen
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=11cea543b00000

kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=8648d6bf4a1e8b1c0b99

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16a7fcb3b00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13defda5b00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8648d6...@syzkaller.appspotmail.com

login: kernel: protection fault trap, code=0
Stopped at ktrops+0x4a: movq 0x8(%rbx),%r14
ddb{1}>
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic

the kernel did not panic

ddb{1}> trace
ktrops(ffff800021211ce0,dead4110dead4110,0,bf787090,fffffd806e227970,fffffd807f7d87e0) at ktrops+0x4a ktrcanset sys/kern/kern_ktrace.c:702 [inline]
ktrops(ffff800021211ce0,dead4110dead4110,0,bf787090,fffffd806e227970,fffffd807f7d87e0) at ktrops+0x4a sys/kern/kern_ktrace.c:547
doktrace(fffffd806e227970,4,3f787090,0,ffff800021211ce0) at doktrace+0x514 ktrsetchildren sys/kern/kern_ktrace.c:572 [inline]
doktrace(fffffd806e227970,4,3f787090,0,ffff800021211ce0) at doktrace+0x514 sys/kern/kern_ktrace.c:494
sys_ktrace(ffff800021211ce0,ffff80002123c448,ffff80002123c4a0) at sys_ktrace+0xd2 sys/kern/kern_ktrace.c:535
syscall(ffff80002123c510) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff80002123c510) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585

Xsyscall() at Xsyscall+0x128
end of kernel

end trace frame: 0x7f7ffffcc300, count: -5
ddb{1}> show registers
rdi 0xffff800021211ce0
rsi 0xdead4110dead4110
rbp 0xffff80002123c230
rbx 0xdead4110dead4110
rdx 0
rcx 0xbf787090
rax 0x1
r8 0xfffffd806e227970
r9 0xfffffd807f7d87e0
r10 0x60797d7b5b31112e
r11 0xc88ca0f8c7b61134
r12 0xdead4110dead4110
r13 0xfffffd807f7d87e0
r14 0xffff800021211ce0
r15 0xbf787090
rip 0xffffffff811bc6ea ktrops+0x4a

cs 0x8
rflags 0x10246 __ALIGN_SIZE+0xf246

rsp 0xffff80002123c1b0
ss 0x10
ktrops+0x4a: movq 0x8(%rbx),%r14
ddb{1}> show proc
PROC (syz-executor1494) pid=336099 stat=onproc
flags process=0 proc=0
pri=17, usrpri=62, nice=20
forw=0xffffffffffffffff, list=0xffff8000211927e8,0xffff800021211a50
process=0xffff8000ffffadc0 user=0xffff800021237000, vmspace=0xfffffd807efff730

estcpu=36, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0

ddb{1}> ps

PID TID PPID UID S FLAGS WAIT COMMAND

54860 330635 83934 0 3 0 biowait syz-executor1494
*39427 336099 1163 0 7 0 syz-executor1494
1163 225704 9157 0 3 0x80 nanoslp syz-executor1494
66411 272433 9157 0 2 0 syz-executor1494
83934 318387 9157 0 3 0x80 nanoslp syz-executor1494
31282 59048 9157 0 3 0x80 nanoslp syz-executor1494
9157 88144 65446 0 3 0x82 nanoslp syz-executor1494
65446 117060 40498 0 3 0x10008a sigsusp ksh
40498 145284 65888 0 3 0x9a poll sshd
41559 375903 1 0 3 0x100083 ttyin getty
65888 48951 1 0 3 0x88 poll sshd
45391 240751 97109 74 3 0x100092 bpf pflogd
97109 470069 1 0 3 0x80 netio pflogd
78626 194977 87330 73 7 0x100010 syslogd
87330 481827 1 0 3 0x100082 netio syslogd
8686 405985 1 0 3 0x100080 kqread resolvd
71513 381772 4017 77 3 0x100092 kqread dhcpleased
71381 132316 4017 77 3 0x100092 kqread dhcpleased
4017 67074 1 0 3 0x80 kqread dhcpleased
1643 141016 0 0 3 0x14200 bored smr
8645 367231 0 0 3 0x14200 pgzero zerothread
96844 411223 0 0 3 0x14200 aiodoned aiodoned
32958 141475 0 0 3 0x14200 syncer update
6958 420947 0 0 3 0x14200 cleaner cleaner
94107 198521 0 0 3 0x14200 reaper reaper
27027 32462 0 0 3 0x14200 pgdaemon pagedaemon
22220 360384 0 0 3 0x14200 bored viomb
28961 436634 0 0 3 0x40014200 acpi0 acpi0
89160 390789 0 0 3 0x40014200 idle1
12172 70231 0 0 3 0x14200 bored softnet
64131 393080 0 0 3 0x14200 bored systqmp
16674 155300 0 0 3 0x14200 bored systq
66787 314189 0 0 3 0x40014200 bored softclock
11335 64200 0 0 3 0x40014200 idle0
1 366161 0 0 3 0x82 wait init

0 0 -1 0 3 0x10200 scheduler swapper

ddb{1}> show all locks
Process 54860 (syz-executor1494) thread 0xffff800021211a40 (330635)
exclusive rrwlock inode r = 0 (0xfffffd806ee14f88)
#0 witness_lock+0x44d
#1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310

#2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461
#3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534

#4 ufs_ihashins+0x42 sys/ufs/ufs/ufs_ihash.c:140
#5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1347
#6 ffs_inode_alloc+0x1be sys/ufs/ffs/ffs_alloc.c:394
#7 ufs_makeinode+0xae sys/ufs/ufs/ufs_vnops.c:1830
#8 ufs_create+0x41 sys/ufs/ufs/ufs_vnops.c:152
#9 VOP_CREATE+0xbc sys/kern/vfs_vops.c:103
#10 vn_open+0x28f sys/kern/vfs_vnops.c:122
#11 doopenat+0x26a sys/kern/vfs_syscalls.c:1128
#12 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#12 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#13 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd806ee14a38)
#0 witness_lock+0x44d
#1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310

#2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461
#3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534
#4 vn_lock+0x84 sys/kern/vfs_vnops.c:579

#5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:413
#6 namei+0x36a sys/kern/vfs_lookup.c:245
#7 vn_open+0x188 sys/kern/vfs_vnops.c:113
#8 doopenat+0x26a sys/kern/vfs_syscalls.c:1128
#9 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#9 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#10 Xsyscall+0x128
Process 39427 (syz-executor1494) thread 0xffff800021211ce0 (336099)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829cd5e8)
#0 witness_lock+0x44d
#1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:227
#2 mi_switch+0x3d3 sys/kern/sched_bsd.c:416
#3 sleep_finish+0x1b2 sys/kern/kern_synch.c:433
#4 tsleep+0x12c sys/kern/kern_synch.c:158
#5 getblk+0x13c sys/kern/vfs_bio.c:1031
#6 bread+0x3a bio_doread sys/kern/vfs_bio.c:436 [inline]
#6 bread+0x3a sys/kern/vfs_bio.c:481
#7 ffs_update+0x14b sys/ufs/ffs/ffs_inode.c:91
#8 ufs_inactive+0x25f sys/ufs/ufs/ufs_inode.c:110
#9 VOP_INACTIVE+0xc4 sys/kern/vfs_vops.c:505
#10 vrele+0xd2 sys/kern/vfs_subr.c:824
#11 ktrsettrace+0xb3 sys/kern/kern_ktrace.c:124
#12 ktrops+0x1a4 sys/kern/kern_ktrace.c:550
#13 doktrace+0x514 ktrsetchildren sys/kern/kern_ktrace.c:572 [inline]
#13 doktrace+0x514 sys/kern/kern_ktrace.c:494
#14 sys_ktrace+0xd2 sys/kern/kern_ktrace.c:535
#15 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#15 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#16 Xsyscall+0x128
ddb{1}> show malloc

Type InUse MemUse HighUse Limit Requests Type Lim

devbuf 10144 6454K 6455K 78643K 11234 0
pcb 13 8K 8K 78643K 13 0
rtable 62 2K 2K 78643K 112 0
ifaddr 29 8K 8K 78643K 30 0
counters 40 33K 33K 78643K 40 0
ioctlops 0 0K 4K 78643K 1479 0

mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 5 0

vnodes 1179 74K 74K 78643K 1184 0

UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0

shm 2 1K 1K 78643K 2 0

VM map 2 1K 1K 78643K 2 0

sem 2 0K 0K 78643K 2 0

dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12598 0

file desc 1 0K 0K 78643K 1 0
proc 67 87K 87K 78643K 281 0

NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0

in_multi 11 0K 0K 78643K 11 0
ether_multi 1 0K 0K 78643K 1 0

ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0

ttys 25 122K 122K 78643K 25 0
exec 0 0K 2K 78643K 344 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 113 36K 36K 78643K 10766 0
UVM aobj 3 2K 2K 78643K 3 0

memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0

NDP 4 0K 0K 78643K 4 0
temp 24 4186K 4262K 78643K 77450 0
kqueue 9 12K 12K 78643K 9 0

SYN cache 2 16K 16K 78643K 2 0

ddb{1}> show all pools

Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 22 0 0 1 0 1 1 0 8 0

rtpcb 120 17 0 14 1 0 1 1 0 8 0
rtentry 112 23 0 1 1 0 1 1 0 8 0
unpcb 128 18159 0 18144 1 0 1 1 0 8 0
syncache 296 5 0 5 2 2 0 1 0 8 0
tcpcb 736 7 0 4 1 0 1 1 0 8 0
arp 120 2 0 0 1 0 1 1 0 8 0
inpcb 304 29 0 23 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 6 0 5 2 1 1 1 0 8 0
pfstkey 112 6 0 5 2 1 1 1 0 8 0
pfstate 320 6 0 5 2 1 1 1 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 97 0 0 7 0 7 7 0 8 0
art_table 32 98 0 0 1 0 1 1 0 8 0
art_node 16 22 0 2 1 0 1 1 0 8 0

dirhash 1024 17 0 0 3 0 3 3 0 8 0

dino2pl 256 19537 0 15853 231 0 231 231 0 8 0
ffsino 272 19537 0 15853 246 0 246 246 0 8 0
nchpl 144 37831 0 36283 58 0 58 58 0 8 0
uvmvnodes 80 19547 0 0 399 0 399 399 0 8 0
vnodes 224 19547 0 0 1150 0 1150 1150 0 8 0
namei 1024 76604 0 76603 2 1 1 1 0 8 0
percpumem 16 32 0 0 1 0 1 1 0 8 0
scxspl 216 254635 0 254634 67 64 3 8 0 8 2
plimitpl 152 20 0 9 1 0 1 1 0 8 0
sigapl 424 9317 0 9282 5 0 5 5 0 8 1
knotepl 112 23 0 0 1 0 1 1 0 8 0
kqueuepl 216 5 0 0 1 0 1 1 0 8 0
pipepl 336 67 0 64 2 1 1 1 0 8 0
fdescpl 496 9303 0 9282 3 0 3 3 0 8 0
filepl 152 37312 0 37251 3 0 3 3 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 22 0 9 1 0 1 1 0 8 0
pgrppl 48 22 0 9 1 0 1 1 0 8 0
ucredpl 96 69 0 57 1 0 1 1 0 8 0
zombiepl 144 9282 0 9281 2 1 1 1 0 8 0
processpl 1064 9317 0 9281 3 0 3 3 0 8 0
procpl 672 9317 0 9281 4 0 4 4 0 8 0
sockpl 480 18205 0 18181 10 5 5 5 0 8 1
mcl64k 65536 28 0 0 4 0 4 4 0 8 0
mcl12k 12288 18 0 0 2 0 2 2 0 8 0
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 3 0 0 1 0 1 1 0 8 0
mcl2k 2048 65 0 0 8 0 8 8 0 8 0
mtagpl 96 2 0 0 1 0 1 1 0 8 0
mbufpl 256 126 0 0 7 0 7 7 0 8 0
bufpl 288 178485 0 153748 1768 0 1768 1768 0 8 0
anonpl 24 705715 0 702947 23 4 19 19 0 186 1
amapchunkpl 152 12107 0 11923 9 1 8 8 0 158 0
amappl16 200 45410 0 45401 2 0 2 2 0 8 1
amappl13 176 18 0 17 2 1 1 1 0 8 0
amappl12 168 18 0 18 2 2 0 1 0 8 0
amappl11 160 53 0 39 1 0 1 1 0 8 0
amappl10 152 23 0 18 1 0 1 1 0 8 0
amappl9 144 448 0 446 1 0 1 1 0 8 0
amappl8 136 263 0 263 2 2 0 1 0 8 0
amappl7 128 48 0 45 1 0 1 1 0 8 0
amappl6 120 100 0 90 1 0 1 1 0 8 0
amappl5 112 188 0 168 1 0 1 1 0 8 0
amappl4 104 502 0 484 1 0 1 1 0 8 0
amappl3 96 9198 0 9184 1 0 1 1 0 8 0
amappl2 88 312 0 278 1 0 1 1 0 8 0
amappl1 80 52910 0 52500 11 2 9 9 0 8 0
amappl 88 10516 0 10428 3 0 3 3 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 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 9303 0 9282 1 0 1 1 0 8 0

uaddrbest 32 2 0 0 1 0 1 1 0 8 0

uaddr 24 9303 0 9282 1 0 1 1 0 8 0
vmmpekpl 168 24840 0 24822 1 0 1 1 0 8 0
vmmpepl 168 340039 0 339003 54 5 49 49 0 357 3
vmsppl 368 9302 0 9282 3 0 3 3 0 8 1
rwobjpl 56 72137 0 52002 288 4 284 284 0 8 0
pdppl 4096 18614 0 18564 70 16 54 54 0 8 4
pvpl 32 1139093 0 1134336 53 11 42 43 0 265 2
pmappl 248 9302 0 9282 2 0 2 2 0 8 0
extentpl 40 57 0 38 1 0 1 1 0 8 0
phpool 112 2360 0 21 67 0 67 67 0 8 0
ddb{1}> machine ddbcpu 0

Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp

ddb{0}> trace
x86_ipi_db(ffffffff82832ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393

x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23

__mp_lock(ffffffff829cd3e0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff829cd3e0) at __mp_lock+0x122 sys/kern/kern_lock.c:147
intr_handler(ffff800021206560,ffff80000004ad00) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532
Xintr_ioapic_edge21_untramp() at Xintr_ioapic_edge21_untramp+0x18f
__mp_lock(ffffffff829cd3e0) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff829cd3e0) at __mp_lock+0x129 sys/kern/kern_lock.c:147
kqueue_scan(ffff800021206850,8,ffff800021206750,ffff800021206940,ffff8000ffff6d30,ffff80002120699c) at kqueue_scan+0xd2 sys/kern/kern_event.c:1289
sys_kevent(ffff8000ffff6d30,ffff800021206a00,ffff800021206a60) at sys_kevent+0x47b sys/kern/kern_event.c:981
syscall(ffff800021206ad0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800021206ad0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585

Xsyscall() at Xsyscall+0x128
end of kernel

end trace frame: 0x7f7ffffdbbb0, count: -11

ddb{0}> machine ddbcpu 1

Stopped at ktrops+0x4a: movq 0x8(%rbx),%r14
ddb{1}> trace
ktrops(ffff800021211ce0,dead4110dead4110,0,bf787090,fffffd806e227970,fffffd807f7d87e0) at ktrops+0x4a ktrcanset sys/kern/kern_ktrace.c:702 [inline]
ktrops(ffff800021211ce0,dead4110dead4110,0,bf787090,fffffd806e227970,fffffd807f7d87e0) at ktrops+0x4a sys/kern/kern_ktrace.c:547
doktrace(fffffd806e227970,4,3f787090,0,ffff800021211ce0) at doktrace+0x514 ktrsetchildren sys/kern/kern_ktrace.c:572 [inline]
doktrace(fffffd806e227970,4,3f787090,0,ffff800021211ce0) at doktrace+0x514 sys/kern/kern_ktrace.c:494
sys_ktrace(ffff800021211ce0,ffff80002123c448,ffff80002123c4a0) at sys_ktrace+0xd2 sys/kern/kern_ktrace.c:535
syscall(ffff80002123c510) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff80002123c510) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585

Xsyscall() at Xsyscall+0x128
end of kernel

end trace frame: 0x7f7ffffcc300, count: -5

[Anton Lindqvist]

Obsoleted by more fine grained reports:

https://github.com/google/syzkaller/commit/2e49f10dbbcec83bf0aa7651c827503e1faec44c

#syz invalid