uvm_fault: dt_ioctl_record_stop (3)
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syzbot
9:23 AM (13 hours ago) 9:23 AM
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 7348976a6ac6 dt: Deny enabling probes after recording starts
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=136d9af6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=d82ab40d2bcc01c05570
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c3075884dd6b/disk-7348976a.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/13e0d30e5557/bsd-7348976a.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/541c26cf3d67/kernel-7348976a.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d82ab4...@syzkaller.appspotmail.com
uvm_fault(0xfffffd806c8b95d0, 0x0, 0, 1) -> e
kernel: page fault trap, code=0
Stopped at dt_ioctl_record_stop+0x108: movq 0(%r14),%r14
TID PID UID PRFLAGS PFLAGS CPU COMMAND
89011 87262 0 0 0 1 syz-executor
dt_ioctl_record_stop(ffff800001767000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593
dtclose(11e5f,1,2000,ffff8000ffffc008) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline]
dtclose(11e5f,1,2000,ffff8000ffffc008) at dtclose+0x109 sys/dev/dt/dt_dev.c:239
spec_close(ffff80003c460400) at spec_close+0x466 sys/kern/spec_vnops.c:-1
VOP_CLOSE(fffffd807463f570,1,fffffd80097fd5b0,ffff8000ffffc008) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156
vn_closefile(fffffd805c0732c0,ffff8000ffffc008) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd805c0732c0,ffff8000ffffc008) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615
fdrop(fffffd805c0732c0,ffff8000ffffc008) at fdrop+0x121 sys/kern/kern_descrip.c:1281
closef(fffffd805c0732c0,ffff8000ffffc008) at closef+0x192 sys/kern/kern_descrip.c:1265
fdfree(ffff8000ffffc008) at fdfree+0x116 sys/kern/kern_descrip.c:1196
exit1(ffff8000ffffc008,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215
sys_exit(ffff8000ffffc008,ffff80003c460770,ffff80003c4606c0) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80003c460770) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c460770) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x742b801bbfd0, count: 3
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
*cpu0: uvm_fault(0xfffffd806c8b95d0, 0x0, 0, 1) -> e
ddb{0}> trace
dt_ioctl_record_stop(ffff800001767000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593
dtclose(11e5f,1,2000,ffff8000ffffc008) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline]
dtclose(11e5f,1,2000,ffff8000ffffc008) at dtclose+0x109 sys/dev/dt/dt_dev.c:239
spec_close(ffff80003c460400) at spec_close+0x466 sys/kern/spec_vnops.c:-1
VOP_CLOSE(fffffd807463f570,1,fffffd80097fd5b0,ffff8000ffffc008) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156
vn_closefile(fffffd805c0732c0,ffff8000ffffc008) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd805c0732c0,ffff8000ffffc008) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615
fdrop(fffffd805c0732c0,ffff8000ffffc008) at fdrop+0x121 sys/kern/kern_descrip.c:1281
closef(fffffd805c0732c0,ffff8000ffffc008) at closef+0x192 sys/kern/kern_descrip.c:1265
fdfree(ffff8000ffffc008) at fdfree+0x116 sys/kern/kern_descrip.c:1196
exit1(ffff8000ffffc008,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215
sys_exit(ffff8000ffffc008,ffff80003c460770,ffff80003c4606c0) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80003c460770) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c460770) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x742b801bbfd0, count: -12
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff80003c460330
rbx 0x1
rdx 0
rcx 0xffff8000ffffc008
rax 0xffffffff83860950 dt_prov_static
r8 0x90
r9 0
r10 0x220480eca38a0c33
r11 0xdcc104d2dd13c282
r12 0
r13 0
r14 0
r15 0xffff80000175b700
rip 0xffffffff81c9e108 dt_ioctl_record_stop+0x108
cs 0x8
rflags 0x10207 __ALIGN_SIZE+0xf207
rsp 0xffff80003c460300
ss 0x10
dt_ioctl_record_stop+0x108: movq 0(%r14),%r14
ddb{0}> show proc
PROC (syz-executor) tid=390942 pid=65096 tcnt=0 stat=onproc
flags process=1008<EXITING,SINGLEEXIT> proc=2000<WEXIT>
runpri=32, usrpri=86, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0xffff8000ffffc008 scnt=-1 ecnt=1
forw=0xffffffffffffffff, list=0xffff8000ffffd230,0xffff80002a2407f0
process=0xffff8000313aab70 user=0xffff80003c45b000, vmspace=0xfffffd806c8b95d0
estcpu=36, cpticks=10, pctcpu=0.0, user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
87262 89011 66857 0 7 0 syz-executor
87262 178394 66857 0 3 0x4000080 fsleep syz-executor
87262 428551 66857 0 2 0x4000000 syz-executor
4008 42329 16654 0 2 0 syz-executor
4008 5925 16654 0 2 0x4000000 syz-executor
2950 103981 4049 0 2 0 syz-executor
2950 30956 4049 0 3 0x4000080 ttyin syz-executor
53459 40866 74205 0 2 0 syz-executor
53459 449001 74205 0 3 0x4000080 fsleep syz-executor
92842 47766 35903 0 3 0x80 nanoslp syz-executor
92842 114574 35903 0 3 0x4000080 kqsel syz-executor
92842 247757 35903 0 3 0x4000080 fsleep syz-executor
92842 232712 35903 0 3 0x4000080 fsleep syz-executor
14594 318942 0 0 3 0x14200 acct acct
88959 246586 72378 0 2 0x2 syz-executor
62544 337568 1 0 3 0x80 nanoslp init
1287 312571 72378 0 3 0x82 nanoslp syz-executor
50467 516631 72378 0 2 0x2 syz-executor
74205 257163 72378 0 3 0x82 nanoslp syz-executor
35903 293721 72378 0 3 0x82 nanoslp syz-executor
94008 253101 0 0 3 0x14280 nfsidl nfsio
63236 334420 0 0 3 0x14280 nfsidl nfsio
75802 80425 0 0 3 0x14280 nfsidl nfsio
3312 299521 0 0 3 0x14280 nfsidl nfsio
58641 19982 0 0 3 0x14280 nfsidl nfsio
62200 94179 0 0 3 0x14280 nfsidl nfsio
18212 512986 0 0 3 0x14280 nfsidl nfsio
92901 342849 0 0 3 0x14280 nfsidl nfsio
12533 446372 0 0 3 0x14280 nfsidl nfsio
89718 240230 0 0 3 0x14280 nfsidl nfsio
11962 17238 0 0 3 0x14280 nfsidl nfsio
51079 381708 0 0 3 0x14280 nfsidl nfsio
73101 460009 0 0 3 0x14280 nfsidl nfsio
35827 329593 0 0 3 0x14280 nfsidl nfsio
42731 157108 0 0 3 0x14280 nfsidl nfsio
98077 407214 0 0 3 0x14280 nfsidl nfsio
62494 81295 0 0 3 0x14280 nfsidl nfsio
2097 219720 0 0 3 0x14280 nfsidl nfsio
19081 522393 0 0 3 0x14280 nfsidl nfsio
31889 189391 0 0 3 0x14280 nfsidl nfsio
4049 375096 72378 0 3 0x82 nanoslp syz-executor
66857 462625 72378 0 3 0x82 nanoslp syz-executor
16654 39050 72378 0 3 0x82 nanoslp syz-executor
72378 209522 63792 0 3 0x82 kqread syz-executor
63792 395864 60790 0 3 0x10008a sigsusp ksh
60790 391737 10374 0 3 0x98 kqread sshd-session
10374 99951 67292 0 3 0x92 kqread sshd-session
67292 217333 1 0 3 0x88 kqread sshd
48602 379126 61063 74 3 0x1100092 bpf pflogd
61063 320217 1 0 3 0x80 sbwait pflogd
99521 230434 62528 73 3 0x1100090 kqread syslogd
62528 23927 1 0 3 0x100082 sbwait syslogd
73166 6435 1 0 3 0x100080 kqread resolvd
56425 72474 92056 77 3 0x100092 kqread dhcpleased
68530 494315 92056 77 3 0x100092 kqread dhcpleased
92056 268215 1 0 3 0x80 kqread dhcpleased
44971 14974 0 0 3 0x14200 bored smr
33420 268796 0 0 3 0x14200 pgzero zerothread
29597 216521 0 0 3 0x14200 aiodoned aiodoned
76915 8877 0 0 3 0x14200 syncer update
90459 75356 0 0 3 0x14200 cleaner cleaner
60298 422188 0 0 2 0x14200 reaper
72161 504720 0 0 3 0x14200 pgdaemon pagedaemon
76289 15259 0 0 3 0x14200 bored viomb
14704 18740 0 0 3 0x40014200 acpi0 acpi0
68253 495697 0 0 3 0x40014200 idle1
80635 347759 0 0 3 0x14200 bored softnet1
10538 132855 0 0 3 0x14200 bored softnet0
16568 278539 0 0 3 0x14200 smrbar systqmp
49210 406947 0 0 3 0x14200 bored systq
56863 240475 0 0 3 0x14200 tmoslp softclockmp
13213 323214 0 0 3 0x40014200 tmoslp softclock
10321 503751 0 0 3 0x40014200 idle0
1 373918 0 0 3 0x82 wait init
0 0 -1 0 3 0x10010200 scheduler swapper
ddb{0}> show all locks
Process 4008 (syz-executor) thread 0xffff80002a2d1790 (5925)
Process 50467 (syz-executor) thread 0xffff80002a240a78 (516631)
Process 60298 (reaper) thread 0xffff8000ffffdc90 (422188)
Process 16568 (systqmp) thread 0xffff8000ffffecf8 (278539)
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11111 12156K 13947K 166960K 15506 0
pcb 18 20K 22K 166960K 677 0
rtable 237 14K 15K 166960K 903 0
pf 37 18K 20K 166960K 352 0
ifaddr 38 8K 9K 166960K 231 0
ifgroup 52 2K 2K 166960K 449 0
sysctl 4 1K 9K 166960K 28 0
counters 70 37K 38K 166960K 460 0
ioctlops 0 0K 4K 166960K 2304 0
iov 0 0K 20K 166960K 231 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1375 86K 87K 166960K 3815 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 9K 166960K 40 0
VM map 2 1K 1K 166960K 2 0
sem 20 17K 17K 166960K 268 0
dirhash 12 2K 2K 166960K 48 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 16 57K 240K 166960K 2825 0
sigio 0 0K 0K 166960K 116 0
proc 63 99K 180K 166960K 1045 0
subproc 72 4K 4K 166960K 144 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 396 0
in_multi 80 6K 7K 166960K 303 0
ether_multi 1 0K 0K 166960K 26 0
mrt 1 0K 0K 166960K 48 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 247 1102K 1102K 166960K 247 0
exec 0 0K 1K 166960K 999 0
fusefs mount 1 32K 32K 166960K 1 0
pfkey data 0 0K 0K 166960K 3 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 229 155K 194K 166960K 27846 0
UVM aobj 79 19K 19K 166960K 90 0
pinsyscall 40 80K 105K 166960K 4319 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 2 0K 1K 166960K 350 0
NDP 12 0K 2K 166960K 173 0
temp 79 9084K 9340K 166960K 125423 0
kqueue 13 20K 32K 166960K 556 0
SYN cache 2 16K 16K 166960K 2 0
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 26 0 0 1 0 1 1 0 8 0
rtpcb 120 261 0 258 2 1 1 2 0 8 0
rtentry 176 270 0 186 6 1 5 6 0 8 0
unpcb 144 2375 0 2358 17 13 4 6 0 8 3
syncache 336 23 0 23 4 3 1 1 0 8 1
tcpqe 32 6 0 6 4 4 0 1 0 8 0
tcpcb 736 953 0 944 18 14 4 10 0 8 2
arp 136 46 0 31 1 0 1 1 0 8 0
inpcb 328 3378 0 3364 37 27 10 15 0 8 8
ip6q 72 1 0 1 1 1 0 1 0 8 0
ip6af 40 2 0 2 1 1 0 1 0 8 0
nd6 152 50 0 33 1 0 1 1 0 8 0
pkpcb 40 10 0 10 4 3 1 1 0 8 1
kcovpl 48 16 0 8 1 0 1 1 0 8 0
mppekey 1024 1 0 1 1 1 0 1 0 8 0
ppxss 1192 143 0 143 2 1 1 1 0 8 1
pppxif 1576 15 0 15 6 5 1 1 0 8 1
pfstscr 40 1 0 1 1 1 0 1 0 8 0
pffrag 232 25 0 14 1 0 1 1 0 482 0
pffrnode 88 24 0 14 1 0 1 1 0 8 0
pffrent 40 44 0 32 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
pfanchor 1288 1 0 0 1 0 1 1 0 8 0
pftag 88 1 0 0 1 0 1 1 0 8 0
pfstitem 24 147 0 75 1 0 1 1 0 8 0
pfstkey 128 150 0 79 3 0 3 3 0 8 0
pfstate 448 146 0 76 10 0 10 10 0 8 0
pfrule 1360 91 0 84 2 1 1 2 0 8 0
rttmr 136 5 0 5 3 3 0 1 0 8 0
art_heap8 4096 3 0 0 3 0 3 3 0 8 0
art_heap4 256 1152 0 789 34 8 26 29 0 8 0
art_table 40 1155 0 789 5 0 5 5 0 8 0
art_node 32 266 0 193 1 0 1 1 0 8 0
sysvmsgpl 40 14 0 5 1 0 1 1 0 8 0
semupl 112 2 0 2 1 1 0 1 0 8 0
semapl 112 226 0 208 1 0 1 1 0 8 0
shmpl 112 80 0 10 2 0 2 2 0 8 0
dirhash 1024 41 0 24 3 0 3 3 0 8 0
dino2pl 256 7002 0 5534 93 0 93 93 0 8 0
ffsino 296 7002 0 5534 114 0 114 114 0 8 0
nchpl 144 10815 0 9103 65 0 65 65 0 8 0
rtmask 32 24 0 24 4 3 1 1 0 8 1
vnodes 216 5926 0 0 330 0 330 330 0 8 0
namei 1024 38717 0 38717 7 6 1 2 0 8 1
percpumem 16 245 0 195 1 0 1 1 0 8 0
vcpupl 3968 7 0 1 1 0 1 1 0 8 0
vmpool 848 7 0 1 1 0 1 1 0 8 0
kstatmem 264 282 0 254 5 2 3 3 0 8 0
acpiwqpl 32 2 0 2 1 0 1 1 1 8 1
scsiplug 72 12 0 12 5 4 1 1 0 8 1
scxspl 216 73238 0 73238 14 13 1 8 1 8 1
plimitpl 152 886 0 870 1 0 1 1 0 8 0
sigapl 424 3143 0 3076 10 1 9 9 0 8 0
knotepl 120 592 0 0 17 0 17 17 0 8 0
kqueuepl 224 1071 0 1060 11 6 5 5 0 8 4
pipepl 344 422 0 395 10 7 3 9 0 8 0
fdescpl 528 3099 0 3069 3 0 3 3 0 8 0
filepl 160 22583 0 22367 34 18 16 21 0 8 4
lockfpl 104 1235 0 1233 2 1 1 2 0 8 0
lockfspl 48 447 0 445 1 0 1 1 0 8 0
sessionpl 144 50 0 42 1 0 1 1 0 8 0
pgrppl 48 206 0 190 1 0 1 1 0 8 0
ucredpl 104 3565 0 3552 1 0 1 1 0 8 0
zombiepl 144 3829 0 3828 1 0 1 1 0 8 0
processpl 1232 3144 0 3076 6 0 6 6 0 8 0
procpl 664 7633 0 7555 8 0 8 8 0 8 0
sosppl 176 23 0 23 3 2 1 1 0 8 1
sockpl 752 6107 0 6073 64 51 13 30 0 8 8
mcl64k 65536 7 0 0 1 0 1 1 0 8 0
mcl16k 16384 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 116 0 0 15 0 15 15 0 8 0
mcl2k2 2112 2 0 0 1 0 1 1 0 8 0
mcl2k 2048 63 0 0 5 0 5 5 0 8 0
mtagpl 96 47 0 0 2 0 2 2 0 8 0
mbufpl 256 1873 0 0 116 0 116 116 0 8 0
bufpl 280 30462 0 24332 439 0 439 439 0 8 0
anonpl 32 12341 0 0 100 0 100 100 0 246 0
amapchunkpl 152 108466 0 107986 74 38 36 41 0 158 10
amappl16 200 10452 0 10417 65 50 15 27 0 8 4
amappl15 192 9 0 9 3 3 0 1 0 8 0
amappl14 184 527 0 526 1 0 1 1 0 8 0
amappl13 176 195 0 184 1 0 1 1 0 8 0
amappl12 168 3400 0 3371 2 0 2 2 0 8 0
amappl11 160 20 0 20 2 2 0 1 0 8 0
amappl10 152 86 0 72 1 0 1 1 0 8 0
amappl9 144 266 0 265 2 1 1 1 0 8 0
amappl8 136 146 0 143 1 0 1 1 0 8 0
amappl7 128 209 0 196 1 0 1 1 0 8 0
amappl6 120 245 0 243 1 0 1 1 0 8 0
amappl5 112 148 0 137 1 0 1 1 0 8 0
amappl4 104 431 0 413 1 0 1 1 0 8 0
amappl3 96 19381 0 19278 4 0 4 4 0 8 0
amappl2 88 889 0 827 2 0 2 2 0 8 0
amappl1 80 30170 0 29587 21 4 17 20 0 8 1
amappl 88 26307 0 26146 5 0 5 5 0 92 0
uvmvnodes 80 171 0 0 4 0 4 4 0 8 0
dma65536 65536 1 0 1 1 1 0 1 0 8 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma2048 2048 2 0 2 2 2 0 1 0 8 0
dma1024 1024 2 0 1 1 0 1 1 0 8 0
dma256 256 7 0 7 2 2 0 1 0 8 0
dma128 128 257 0 257 4 4 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 19 0 18 1 0 1 1 0 8 0
aobjpl 72 89 0 11 2 0 2 2 0 8 0
uaddrrnd 24 3099 0 3069 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 3099 0 3069 1 0 1 1 0 8 0
vmmpekpl 168 27182 0 27122 4 0 4 4 0 8 0
vmmpepl 168 214015 0 212164 149 47 102 118 0 357 7
vmsppl 488 3098 0 3069 5 0 5 5 0 8 0
rwobjpl 80 60108 0 58958 40 5 35 37 0 8 0
pdppl 4096 6219 0 6146 153 76 77 83 0 8 4
pvpl 32 21420 0 0 173 0 173 173 0 265 0
pmappl 256 3105 0 3070 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 477 0 115 11 0 11 11 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
dt_ioctl_record_stop(ffff800001767000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593
dtclose(11e5f,1,2000,ffff8000ffffc008) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline]
dtclose(11e5f,1,2000,ffff8000ffffc008) at dtclose+0x109 sys/dev/dt/dt_dev.c:239
spec_close(ffff80003c460400) at spec_close+0x466 sys/kern/spec_vnops.c:-1
VOP_CLOSE(fffffd807463f570,1,fffffd80097fd5b0,ffff8000ffffc008) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156
vn_closefile(fffffd805c0732c0,ffff8000ffffc008) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd805c0732c0,ffff8000ffffc008) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615
fdrop(fffffd805c0732c0,ffff8000ffffc008) at fdrop+0x121 sys/kern/kern_descrip.c:1281
closef(fffffd805c0732c0,ffff8000ffffc008) at closef+0x192 sys/kern/kern_descrip.c:1265
fdfree(ffff8000ffffc008) at fdfree+0x116 sys/kern/kern_descrip.c:1196
exit1(ffff8000ffffc008,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215
sys_exit(ffff8000ffffc008,ffff80003c460770,ffff80003c4606c0) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80003c460770) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c460770) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x742b801bbfd0, count: -12
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffff8000299bdff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
end of kernel
end trace frame: 0x7e432d6205c0, count: 12
ddb{1}> trace
x86_ipi_db(ffff8000299bdff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
end of kernel
end trace frame: 0x7e432d6205c0, count: -3
---
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syzbot found the following issue on:
HEAD commit: 7348976a6ac6 dt: Deny enabling probes after recording starts
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=136d9af6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=d82ab40d2bcc01c05570
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c3075884dd6b/disk-7348976a.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/13e0d30e5557/bsd-7348976a.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/541c26cf3d67/kernel-7348976a.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d82ab4...@syzkaller.appspotmail.com
uvm_fault(0xfffffd806c8b95d0, 0x0, 0, 1) -> e
kernel: page fault trap, code=0
Stopped at dt_ioctl_record_stop+0x108: movq 0(%r14),%r14
TID PID UID PRFLAGS PFLAGS CPU COMMAND
89011 87262 0 0 0 1 syz-executor
dt_ioctl_record_stop(ffff800001767000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593
dtclose(11e5f,1,2000,ffff8000ffffc008) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline]
dtclose(11e5f,1,2000,ffff8000ffffc008) at dtclose+0x109 sys/dev/dt/dt_dev.c:239
spec_close(ffff80003c460400) at spec_close+0x466 sys/kern/spec_vnops.c:-1
VOP_CLOSE(fffffd807463f570,1,fffffd80097fd5b0,ffff8000ffffc008) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156
vn_closefile(fffffd805c0732c0,ffff8000ffffc008) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd805c0732c0,ffff8000ffffc008) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615
fdrop(fffffd805c0732c0,ffff8000ffffc008) at fdrop+0x121 sys/kern/kern_descrip.c:1281
closef(fffffd805c0732c0,ffff8000ffffc008) at closef+0x192 sys/kern/kern_descrip.c:1265
fdfree(ffff8000ffffc008) at fdfree+0x116 sys/kern/kern_descrip.c:1196
exit1(ffff8000ffffc008,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215
sys_exit(ffff8000ffffc008,ffff80003c460770,ffff80003c4606c0) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80003c460770) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c460770) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x742b801bbfd0, count: 3
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
*cpu0: uvm_fault(0xfffffd806c8b95d0, 0x0, 0, 1) -> e
ddb{0}> trace
dt_ioctl_record_stop(ffff800001767000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593
dtclose(11e5f,1,2000,ffff8000ffffc008) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline]
dtclose(11e5f,1,2000,ffff8000ffffc008) at dtclose+0x109 sys/dev/dt/dt_dev.c:239
spec_close(ffff80003c460400) at spec_close+0x466 sys/kern/spec_vnops.c:-1
VOP_CLOSE(fffffd807463f570,1,fffffd80097fd5b0,ffff8000ffffc008) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156
vn_closefile(fffffd805c0732c0,ffff8000ffffc008) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd805c0732c0,ffff8000ffffc008) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615
fdrop(fffffd805c0732c0,ffff8000ffffc008) at fdrop+0x121 sys/kern/kern_descrip.c:1281
closef(fffffd805c0732c0,ffff8000ffffc008) at closef+0x192 sys/kern/kern_descrip.c:1265
fdfree(ffff8000ffffc008) at fdfree+0x116 sys/kern/kern_descrip.c:1196
exit1(ffff8000ffffc008,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215
sys_exit(ffff8000ffffc008,ffff80003c460770,ffff80003c4606c0) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80003c460770) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c460770) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x742b801bbfd0, count: -12
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff80003c460330
rbx 0x1
rdx 0
rcx 0xffff8000ffffc008
rax 0xffffffff83860950 dt_prov_static
r8 0x90
r9 0
r10 0x220480eca38a0c33
r11 0xdcc104d2dd13c282
r12 0
r13 0
r14 0
r15 0xffff80000175b700
rip 0xffffffff81c9e108 dt_ioctl_record_stop+0x108
cs 0x8
rflags 0x10207 __ALIGN_SIZE+0xf207
rsp 0xffff80003c460300
ss 0x10
dt_ioctl_record_stop+0x108: movq 0(%r14),%r14
ddb{0}> show proc
PROC (syz-executor) tid=390942 pid=65096 tcnt=0 stat=onproc
flags process=1008<EXITING,SINGLEEXIT> proc=2000<WEXIT>
runpri=32, usrpri=86, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0xffff8000ffffc008 scnt=-1 ecnt=1
forw=0xffffffffffffffff, list=0xffff8000ffffd230,0xffff80002a2407f0
process=0xffff8000313aab70 user=0xffff80003c45b000, vmspace=0xfffffd806c8b95d0
estcpu=36, cpticks=10, pctcpu=0.0, user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
87262 89011 66857 0 7 0 syz-executor
87262 178394 66857 0 3 0x4000080 fsleep syz-executor
87262 428551 66857 0 2 0x4000000 syz-executor
4008 42329 16654 0 2 0 syz-executor
4008 5925 16654 0 2 0x4000000 syz-executor
2950 103981 4049 0 2 0 syz-executor
2950 30956 4049 0 3 0x4000080 ttyin syz-executor
53459 40866 74205 0 2 0 syz-executor
53459 449001 74205 0 3 0x4000080 fsleep syz-executor
92842 47766 35903 0 3 0x80 nanoslp syz-executor
92842 114574 35903 0 3 0x4000080 kqsel syz-executor
92842 247757 35903 0 3 0x4000080 fsleep syz-executor
92842 232712 35903 0 3 0x4000080 fsleep syz-executor
14594 318942 0 0 3 0x14200 acct acct
88959 246586 72378 0 2 0x2 syz-executor
62544 337568 1 0 3 0x80 nanoslp init
1287 312571 72378 0 3 0x82 nanoslp syz-executor
50467 516631 72378 0 2 0x2 syz-executor
74205 257163 72378 0 3 0x82 nanoslp syz-executor
35903 293721 72378 0 3 0x82 nanoslp syz-executor
94008 253101 0 0 3 0x14280 nfsidl nfsio
63236 334420 0 0 3 0x14280 nfsidl nfsio
75802 80425 0 0 3 0x14280 nfsidl nfsio
3312 299521 0 0 3 0x14280 nfsidl nfsio
58641 19982 0 0 3 0x14280 nfsidl nfsio
62200 94179 0 0 3 0x14280 nfsidl nfsio
18212 512986 0 0 3 0x14280 nfsidl nfsio
92901 342849 0 0 3 0x14280 nfsidl nfsio
12533 446372 0 0 3 0x14280 nfsidl nfsio
89718 240230 0 0 3 0x14280 nfsidl nfsio
11962 17238 0 0 3 0x14280 nfsidl nfsio
51079 381708 0 0 3 0x14280 nfsidl nfsio
73101 460009 0 0 3 0x14280 nfsidl nfsio
35827 329593 0 0 3 0x14280 nfsidl nfsio
42731 157108 0 0 3 0x14280 nfsidl nfsio
98077 407214 0 0 3 0x14280 nfsidl nfsio
62494 81295 0 0 3 0x14280 nfsidl nfsio
2097 219720 0 0 3 0x14280 nfsidl nfsio
19081 522393 0 0 3 0x14280 nfsidl nfsio
31889 189391 0 0 3 0x14280 nfsidl nfsio
4049 375096 72378 0 3 0x82 nanoslp syz-executor
66857 462625 72378 0 3 0x82 nanoslp syz-executor
16654 39050 72378 0 3 0x82 nanoslp syz-executor
72378 209522 63792 0 3 0x82 kqread syz-executor
63792 395864 60790 0 3 0x10008a sigsusp ksh
60790 391737 10374 0 3 0x98 kqread sshd-session
10374 99951 67292 0 3 0x92 kqread sshd-session
67292 217333 1 0 3 0x88 kqread sshd
48602 379126 61063 74 3 0x1100092 bpf pflogd
61063 320217 1 0 3 0x80 sbwait pflogd
99521 230434 62528 73 3 0x1100090 kqread syslogd
62528 23927 1 0 3 0x100082 sbwait syslogd
73166 6435 1 0 3 0x100080 kqread resolvd
56425 72474 92056 77 3 0x100092 kqread dhcpleased
68530 494315 92056 77 3 0x100092 kqread dhcpleased
92056 268215 1 0 3 0x80 kqread dhcpleased
44971 14974 0 0 3 0x14200 bored smr
33420 268796 0 0 3 0x14200 pgzero zerothread
29597 216521 0 0 3 0x14200 aiodoned aiodoned
76915 8877 0 0 3 0x14200 syncer update
90459 75356 0 0 3 0x14200 cleaner cleaner
60298 422188 0 0 2 0x14200 reaper
72161 504720 0 0 3 0x14200 pgdaemon pagedaemon
76289 15259 0 0 3 0x14200 bored viomb
14704 18740 0 0 3 0x40014200 acpi0 acpi0
68253 495697 0 0 3 0x40014200 idle1
80635 347759 0 0 3 0x14200 bored softnet1
10538 132855 0 0 3 0x14200 bored softnet0
16568 278539 0 0 3 0x14200 smrbar systqmp
49210 406947 0 0 3 0x14200 bored systq
56863 240475 0 0 3 0x14200 tmoslp softclockmp
13213 323214 0 0 3 0x40014200 tmoslp softclock
10321 503751 0 0 3 0x40014200 idle0
1 373918 0 0 3 0x82 wait init
0 0 -1 0 3 0x10010200 scheduler swapper
ddb{0}> show all locks
Process 4008 (syz-executor) thread 0xffff80002a2d1790 (5925)
Process 50467 (syz-executor) thread 0xffff80002a240a78 (516631)
Process 60298 (reaper) thread 0xffff8000ffffdc90 (422188)
Process 16568 (systqmp) thread 0xffff8000ffffecf8 (278539)
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11111 12156K 13947K 166960K 15506 0
pcb 18 20K 22K 166960K 677 0
rtable 237 14K 15K 166960K 903 0
pf 37 18K 20K 166960K 352 0
ifaddr 38 8K 9K 166960K 231 0
ifgroup 52 2K 2K 166960K 449 0
sysctl 4 1K 9K 166960K 28 0
counters 70 37K 38K 166960K 460 0
ioctlops 0 0K 4K 166960K 2304 0
iov 0 0K 20K 166960K 231 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1375 86K 87K 166960K 3815 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 9K 166960K 40 0
VM map 2 1K 1K 166960K 2 0
sem 20 17K 17K 166960K 268 0
dirhash 12 2K 2K 166960K 48 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 16 57K 240K 166960K 2825 0
sigio 0 0K 0K 166960K 116 0
proc 63 99K 180K 166960K 1045 0
subproc 72 4K 4K 166960K 144 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 396 0
in_multi 80 6K 7K 166960K 303 0
ether_multi 1 0K 0K 166960K 26 0
mrt 1 0K 0K 166960K 48 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 247 1102K 1102K 166960K 247 0
exec 0 0K 1K 166960K 999 0
fusefs mount 1 32K 32K 166960K 1 0
pfkey data 0 0K 0K 166960K 3 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 229 155K 194K 166960K 27846 0
UVM aobj 79 19K 19K 166960K 90 0
pinsyscall 40 80K 105K 166960K 4319 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 2 0K 1K 166960K 350 0
NDP 12 0K 2K 166960K 173 0
temp 79 9084K 9340K 166960K 125423 0
kqueue 13 20K 32K 166960K 556 0
SYN cache 2 16K 16K 166960K 2 0
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 26 0 0 1 0 1 1 0 8 0
rtpcb 120 261 0 258 2 1 1 2 0 8 0
rtentry 176 270 0 186 6 1 5 6 0 8 0
unpcb 144 2375 0 2358 17 13 4 6 0 8 3
syncache 336 23 0 23 4 3 1 1 0 8 1
tcpqe 32 6 0 6 4 4 0 1 0 8 0
tcpcb 736 953 0 944 18 14 4 10 0 8 2
arp 136 46 0 31 1 0 1 1 0 8 0
inpcb 328 3378 0 3364 37 27 10 15 0 8 8
ip6q 72 1 0 1 1 1 0 1 0 8 0
ip6af 40 2 0 2 1 1 0 1 0 8 0
nd6 152 50 0 33 1 0 1 1 0 8 0
pkpcb 40 10 0 10 4 3 1 1 0 8 1
kcovpl 48 16 0 8 1 0 1 1 0 8 0
mppekey 1024 1 0 1 1 1 0 1 0 8 0
ppxss 1192 143 0 143 2 1 1 1 0 8 1
pppxif 1576 15 0 15 6 5 1 1 0 8 1
pfstscr 40 1 0 1 1 1 0 1 0 8 0
pffrag 232 25 0 14 1 0 1 1 0 482 0
pffrnode 88 24 0 14 1 0 1 1 0 8 0
pffrent 40 44 0 32 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
pfanchor 1288 1 0 0 1 0 1 1 0 8 0
pftag 88 1 0 0 1 0 1 1 0 8 0
pfstitem 24 147 0 75 1 0 1 1 0 8 0
pfstkey 128 150 0 79 3 0 3 3 0 8 0
pfstate 448 146 0 76 10 0 10 10 0 8 0
pfrule 1360 91 0 84 2 1 1 2 0 8 0
rttmr 136 5 0 5 3 3 0 1 0 8 0
art_heap8 4096 3 0 0 3 0 3 3 0 8 0
art_heap4 256 1152 0 789 34 8 26 29 0 8 0
art_table 40 1155 0 789 5 0 5 5 0 8 0
art_node 32 266 0 193 1 0 1 1 0 8 0
sysvmsgpl 40 14 0 5 1 0 1 1 0 8 0
semupl 112 2 0 2 1 1 0 1 0 8 0
semapl 112 226 0 208 1 0 1 1 0 8 0
shmpl 112 80 0 10 2 0 2 2 0 8 0
dirhash 1024 41 0 24 3 0 3 3 0 8 0
dino2pl 256 7002 0 5534 93 0 93 93 0 8 0
ffsino 296 7002 0 5534 114 0 114 114 0 8 0
nchpl 144 10815 0 9103 65 0 65 65 0 8 0
rtmask 32 24 0 24 4 3 1 1 0 8 1
vnodes 216 5926 0 0 330 0 330 330 0 8 0
namei 1024 38717 0 38717 7 6 1 2 0 8 1
percpumem 16 245 0 195 1 0 1 1 0 8 0
vcpupl 3968 7 0 1 1 0 1 1 0 8 0
vmpool 848 7 0 1 1 0 1 1 0 8 0
kstatmem 264 282 0 254 5 2 3 3 0 8 0
acpiwqpl 32 2 0 2 1 0 1 1 1 8 1
scsiplug 72 12 0 12 5 4 1 1 0 8 1
scxspl 216 73238 0 73238 14 13 1 8 1 8 1
plimitpl 152 886 0 870 1 0 1 1 0 8 0
sigapl 424 3143 0 3076 10 1 9 9 0 8 0
knotepl 120 592 0 0 17 0 17 17 0 8 0
kqueuepl 224 1071 0 1060 11 6 5 5 0 8 4
pipepl 344 422 0 395 10 7 3 9 0 8 0
fdescpl 528 3099 0 3069 3 0 3 3 0 8 0
filepl 160 22583 0 22367 34 18 16 21 0 8 4
lockfpl 104 1235 0 1233 2 1 1 2 0 8 0
lockfspl 48 447 0 445 1 0 1 1 0 8 0
sessionpl 144 50 0 42 1 0 1 1 0 8 0
pgrppl 48 206 0 190 1 0 1 1 0 8 0
ucredpl 104 3565 0 3552 1 0 1 1 0 8 0
zombiepl 144 3829 0 3828 1 0 1 1 0 8 0
processpl 1232 3144 0 3076 6 0 6 6 0 8 0
procpl 664 7633 0 7555 8 0 8 8 0 8 0
sosppl 176 23 0 23 3 2 1 1 0 8 1
sockpl 752 6107 0 6073 64 51 13 30 0 8 8
mcl64k 65536 7 0 0 1 0 1 1 0 8 0
mcl16k 16384 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 116 0 0 15 0 15 15 0 8 0
mcl2k2 2112 2 0 0 1 0 1 1 0 8 0
mcl2k 2048 63 0 0 5 0 5 5 0 8 0
mtagpl 96 47 0 0 2 0 2 2 0 8 0
mbufpl 256 1873 0 0 116 0 116 116 0 8 0
bufpl 280 30462 0 24332 439 0 439 439 0 8 0
anonpl 32 12341 0 0 100 0 100 100 0 246 0
amapchunkpl 152 108466 0 107986 74 38 36 41 0 158 10
amappl16 200 10452 0 10417 65 50 15 27 0 8 4
amappl15 192 9 0 9 3 3 0 1 0 8 0
amappl14 184 527 0 526 1 0 1 1 0 8 0
amappl13 176 195 0 184 1 0 1 1 0 8 0
amappl12 168 3400 0 3371 2 0 2 2 0 8 0
amappl11 160 20 0 20 2 2 0 1 0 8 0
amappl10 152 86 0 72 1 0 1 1 0 8 0
amappl9 144 266 0 265 2 1 1 1 0 8 0
amappl8 136 146 0 143 1 0 1 1 0 8 0
amappl7 128 209 0 196 1 0 1 1 0 8 0
amappl6 120 245 0 243 1 0 1 1 0 8 0
amappl5 112 148 0 137 1 0 1 1 0 8 0
amappl4 104 431 0 413 1 0 1 1 0 8 0
amappl3 96 19381 0 19278 4 0 4 4 0 8 0
amappl2 88 889 0 827 2 0 2 2 0 8 0
amappl1 80 30170 0 29587 21 4 17 20 0 8 1
amappl 88 26307 0 26146 5 0 5 5 0 92 0
uvmvnodes 80 171 0 0 4 0 4 4 0 8 0
dma65536 65536 1 0 1 1 1 0 1 0 8 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma2048 2048 2 0 2 2 2 0 1 0 8 0
dma1024 1024 2 0 1 1 0 1 1 0 8 0
dma256 256 7 0 7 2 2 0 1 0 8 0
dma128 128 257 0 257 4 4 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 19 0 18 1 0 1 1 0 8 0
aobjpl 72 89 0 11 2 0 2 2 0 8 0
uaddrrnd 24 3099 0 3069 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 3099 0 3069 1 0 1 1 0 8 0
vmmpekpl 168 27182 0 27122 4 0 4 4 0 8 0
vmmpepl 168 214015 0 212164 149 47 102 118 0 357 7
vmsppl 488 3098 0 3069 5 0 5 5 0 8 0
rwobjpl 80 60108 0 58958 40 5 35 37 0 8 0
pdppl 4096 6219 0 6146 153 76 77 83 0 8 4
pvpl 32 21420 0 0 173 0 173 173 0 265 0
pmappl 256 3105 0 3070 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 477 0 115 11 0 11 11 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
dt_ioctl_record_stop(ffff800001767000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593
dtclose(11e5f,1,2000,ffff8000ffffc008) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline]
dtclose(11e5f,1,2000,ffff8000ffffc008) at dtclose+0x109 sys/dev/dt/dt_dev.c:239
spec_close(ffff80003c460400) at spec_close+0x466 sys/kern/spec_vnops.c:-1
VOP_CLOSE(fffffd807463f570,1,fffffd80097fd5b0,ffff8000ffffc008) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156
vn_closefile(fffffd805c0732c0,ffff8000ffffc008) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd805c0732c0,ffff8000ffffc008) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615
fdrop(fffffd805c0732c0,ffff8000ffffc008) at fdrop+0x121 sys/kern/kern_descrip.c:1281
closef(fffffd805c0732c0,ffff8000ffffc008) at closef+0x192 sys/kern/kern_descrip.c:1265
fdfree(ffff8000ffffc008) at fdfree+0x116 sys/kern/kern_descrip.c:1196
exit1(ffff8000ffffc008,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215
sys_exit(ffff8000ffffc008,ffff80003c460770,ffff80003c4606c0) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80003c460770) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c460770) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x742b801bbfd0, count: -12
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffff8000299bdff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
end of kernel
end trace frame: 0x7e432d6205c0, count: 12
ddb{1}> trace
x86_ipi_db(ffff8000299bdff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
end of kernel
end trace frame: 0x7e432d6205c0, count: -3
---
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