assert "curproc->p_kd == NULL" failed in kcov.c
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syzbot
Aug 13, 2020, 8:12:26 AM8/13/20
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 0a23da6d Add __multi3 from compiler_rt-8.x
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=1328cc6e900000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=1252e696865efc29b767
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+1252e6...@syzkaller.appspotmail.com
panic: kernel diagnostic assertion "curproc->p_kd == NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/dev/kcov.c", line 519
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
436773 67176 0 0x2 0x4000000 1 syz-fuzzer
*220442 34018 0 0x14000 0x200 0 softnet
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff823c5d16) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242e558,ffffffff82428da8,207,ffffffff823ce69c) at __assert+0x2b sys/kern/subr_prf.c:162
kcov_remote_enter(0,ffff800020e00010) at kcov_remote_enter+0x155 sys/dev/kcov.c:519
taskq_thread(ffff80000002c000) at taskq_thread+0xd9 sys/kern/kern_task.c:447
end trace frame: 0x0, count: 10
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
kernel diagnostic assertion "curproc->p_kd == NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/dev/kcov.c", line 519
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff823c5d16) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242e558,ffffffff82428da8,207,ffffffff823ce69c) at __assert+0x2b sys/kern/subr_prf.c:162
kcov_remote_enter(0,ffff800020e00010) at kcov_remote_enter+0x155 sys/dev/kcov.c:519
taskq_thread(ffff80000002c000) at taskq_thread+0xd9 sys/kern/kern_task.c:447
end trace frame: 0x0, count: -5
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff800020db9370
rbx 0xffff800020db9380
rdx 0x8b
rcx 0x2
rax 0x1
r8 0xffff800020db9330
r9 0xffffffff82281826 kprintf+0x146
r10 0x1
r11 0x39a124a08fb7e073
r12 0x3000000008
r13 0xffff800020db9420
r14 0x100
r15 0x1
rip 0xffffffff810d1058 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800020db9360
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (softnet) pid=220442 stat=onproc
flags process=14000<NOZOMBIE,SYSTEM> proc=200<SYSTEM>
pri=32, usrpri=50, nice=20
forw=0xffffffffffffffff, list=0xffff800020d98000,0xffff800020d98500
process=0xffff800020d9abd0 user=0xffff800020db4000, vmspace=0xffffffff828dd1d0
estcpu=0, cpticks=2, pctcpu=0.0
user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
35739 503501 0 0 3 0x14280 nfsidl nfsio
99807 225870 0 0 3 0x14280 nfsidl nfsio
37289 63215 0 0 3 0x14280 nfsidl nfsio
49705 444554 0 0 3 0x14280 nfsidl nfsio
31266 418317 0 0 3 0x14280 nfsidl nfsio
77117 498501 0 0 3 0x14280 nfsidl nfsio
20481 319844 0 0 3 0x14280 nfsidl nfsio
50220 384544 0 0 3 0x14280 nfsidl nfsio
56786 405662 0 0 3 0x14280 nfsidl nfsio
29131 516516 0 0 3 0x14280 nfsidl nfsio
67175 516082 0 0 3 0x14280 nfsidl nfsio
33841 173598 0 0 3 0x14280 nfsidl nfsio
61643 519087 0 0 3 0x14280 nfsidl nfsio
24369 161016 0 0 3 0x14280 nfsidl nfsio
50004 479732 0 0 3 0x14280 nfsidl nfsio
65371 312994 0 0 3 0x14280 nfsidl nfsio
40515 18060 0 0 3 0x14280 nfsidl nfsio
42031 63294 0 0 3 0x14280 nfsidl nfsio
13745 279611 0 0 3 0x14280 nfsidl nfsio
91429 149805 0 0 3 0x14280 nfsidl nfsio
14611 13136 1 0 3 0x100083 ttyin getty
4213 295589 0 0 3 0x14200 bored sosplice
29931 222711 67176 0 3 0x2 biowait syz-executor.1
67176 218385 42612 0 3 0x82 thrsleep syz-fuzzer
67176 295035 42612 0 3 0x4000082 nanosleep syz-fuzzer
67176 298502 42612 0 3 0x4000082 thrsleep syz-fuzzer
67176 75798 42612 0 3 0x4000082 thrsleep syz-fuzzer
67176 82137 42612 0 3 0x4000082 thrsleep syz-fuzzer
67176 119485 42612 0 3 0x4000082 thrsleep syz-fuzzer
67176 149925 42612 0 3 0x4000082 thrsleep syz-fuzzer
67176 436773 42612 0 7 0x4000002 syz-fuzzer
42612 138292 44687 0 3 0x10008a pause ksh
44687 295798 20417 0 3 0x92 select sshd
20417 62940 1 0 3 0x80 select sshd
75219 188046 17950 74 3 0x100092 bpf pflogd
17950 339220 1 0 3 0x80 netio pflogd
19898 382516 70599 73 3 0x100090 kqread syslogd
70599 90017 1 0 3 0x100082 netio syslogd
8880 416429 1 77 3 0x100090 poll dhclient
96598 117557 1 0 3 0x80 poll dhclient
85843 302473 0 0 3 0x14200 bored smr
93090 320378 0 0 3 0x14200 pgzero zerothread
32614 117650 0 0 3 0x14200 aiodoned aiodoned
84810 328165 0 0 3 0x14200 syncer update
49878 66945 0 0 3 0x14200 cleaner cleaner
73150 115159 0 0 3 0x14200 reaper reaper
5368 439020 0 0 3 0x14200 pgdaemon pagedaemon
71554 261983 0 0 3 0x14200 bored crynlk
82955 70660 0 0 3 0x14200 bored crypto
58962 254914 0 0 3 0x40014200 acpi0 acpi0
32889 453822 0 0 3 0x40014200 idle1
*34018 220442 0 0 7 0x14200 softnet
78978 1712 0 0 3 0x14200 bored systqmp
78957 31809 0 0 3 0x14200 bored systq
80725 263291 0 0 3 0x40014200 bored softclock
40615 8407 0 0 3 0x40014200 idle0
1 184438 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex /syzkaller/managers/multicore/kernel/sys/dev/kcov.c:92 r = 0 (0xffffffff826cd048)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164
#1 mtx_enter_try+0x100
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 kcov_remote_enter+0x62 kr_lookup sys/dev/kcov.c:674 [inline]
#3 kcov_remote_enter+0x62 sys/dev/kcov.c:513
#4 taskq_thread+0xd9 sys/kern/kern_task.c:447
#5 proc_trampoline+0x1c
Process 29931 (syz-executor.1) thread 0xffff800020ea1b40 (222711)
exclusive rrwlock inode r = 0 (0xfffffd807a0a8f80)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164
#1 rw_enter+0x446 sys/kern/kern_rwlock.c:311
#2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462
#3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:603
#4 vn_lock+0x6c sys/kern/vfs_vnops.c:575
#5 vget+0x1c6 sys/kern/vfs_subr.c:671
#6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119
#7 ffs_vget+0x6b sys/ufs/ffs/ffs_vfsops.c:1321
#8 ufs_lookup+0x151d sys/ufs/ufs/ufs_lookup.c:487
#9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:90
#10 vfs_lookup+0x708 sys/kern/vfs_lookup.c:568
#11 namei+0x5f7 sys/kern/vfs_lookup.c:249
#12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1853
#13 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#13 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:570
#14 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd806c81a6f8)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164
#1 rw_enter+0x446 sys/kern/kern_rwlock.c:311
#2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462
#3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:603
#4 vn_lock+0x6c sys/kern/vfs_vnops.c:575
#5 vfs_lookup+0xe6 sys/kern/vfs_lookup.c:419
#6 namei+0x5f7 sys/kern/vfs_lookup.c:249
#7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1853
#8 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#8 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:570
#9 Xsyscall+0x128
Process 34018 (softnet) thread 0xffff800020d98278 (220442)
shared rwlock softnet r = 0 (0xffff80000002c070)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164
#1 taskq_thread+0xcb sys/kern/kern_task.c:445
#2 proc_trampoline+0x1c
exclusive mutex /syzkaller/managers/multicore/kernel/sys/dev/kcov.c:92 r = 0 (0xffffffff826cd048)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164
#1 mtx_enter_try+0x100
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 kcov_remote_enter+0x62 kr_lookup sys/dev/kcov.c:674 [inline]
#3 kcov_remote_enter+0x62 sys/dev/kcov.c:513
#4 taskq_thread+0xd9 sys/kern/kern_task.c:447
#5 proc_trampoline+0x1c
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 9536 6456K 7398K 78643K 15099 0
pcb 13 8K 8K 78643K 241 0
rtable 99 5K 6K 78643K 789 0
ifaddr 81 15K 16K 78643K 248 0
counters 45 34K 34K 78643K 97 0
ioctlops 0 0K 4K 78643K 1641 0
iov 0 0K 28K 78643K 175 0
mount 1 1K 1K 78643K 1 0
vnodes 1218 77K 77K 78643K 2750 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 9K 78643K 52 0
VM map 2 1K 1K 78643K 2 0
sem 12 0K 1K 78643K 369 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1824 197K 290K 78643K 13058 0
file desc 4 9K 25K 78643K 3856 0
sigio 0 0K 0K 78643K 57 0
proc 64 63K 95K 78643K 635 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 303 0
in_multi 22 1K 2K 78643K 297 0
ether_multi 1 0K 0K 78643K 50 0
mrt 0 0K 0K 78643K 18 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 55 254K 254K 78643K 55 0
exec 0 0K 2K 78643K 482 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 161 91K 94K 78643K 9701 0
UVM aobj 118 8K 8K 78643K 130 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 201 0
NDP 15 0K 0K 78643K 64 0
temp 144 3967K 4031K 78643K 35554 0
kqueue 3 4K 10K 78643K 126 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 5 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 96 120 0 118 1 0 1 1 0 8 0
rtentry 112 124 0 91 2 1 1 2 0 8 0
unpcb 120 1033 0 1023 1 0 1 1 0 8 0
syncache 272 54 0 54 8 8 0 1 0 8 0
tcpqe 32 15 0 15 3 3 0 1 0 8 0
tcpcb 592 708 0 699 14 12 2 6 0 8 1
inpcb 296 2199 0 2190 5 3 2 3 0 8 1
nd6 48 27 0 24 1 0 1 1 0 8 0
pkpcb 40 23 0 23 3 3 0 1 0 8 0
kcovpl 48 3 0 1 1 0 1 1 0 8 0
ppxss 1136 10 0 9 1 0 1 1 0 8 0
pffrag 232 26 0 26 4 4 0 1 0 482 0
pffrnode 88 26 0 26 4 4 0 1 0 8 0
pffrent 40 750 0 750 4 4 0 1 0 8 0
pfosfp 40 846 0 423 5 0 5 5 0 8 0
pfosfpen 112 1428 0 714 21 0 21 21 0 8 0
pfrktable 1344 61 0 58 1 0 1 1 0 8 0
pftag 88 11 0 10 2 1 1 1 0 8 0
pfstitem 24 116 0 77 1 0 1 1 0 8 0
pfstkey 112 116 0 77 2 0 2 2 0 8 0
pfstate 328 116 0 77 5 1 4 4 0 8 0
pfrule 1360 74 0 51 3 1 2 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 631 0 483 15 5 10 13 0 8 0
art_table 32 632 0 483 2 0 2 2 0 8 0
art_node 16 123 0 93 1 0 1 1 0 8 0
semapl 112 367 0 357 1 0 1 1 0 8 0
shmpl 112 127 0 12 4 0 4 4 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 6537 0 5134 90 1 89 89 0 8 0
ffsino 272 6537 0 5134 95 0 95 95 0 8 0
nchpl 144 11357 0 9768 60 0 60 60 0 8 0
uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0
vnodes 208 5926 0 0 312 0 312 312 0 8 0
namei 1024 28614 0 28614 2 1 1 1 0 8 1
percpumem 16 59 0 26 1 0 1 1 0 8 0
vcpupl 1984 5 0 0 1 0 1 1 0 8 0
vmpool 560 5 0 0 1 0 1 1 0 8 0
pfiaddrpl 120 30 0 25 1 0 1 1 0 8 0
scsiplug 72 4 0 4 1 0 1 1 0 8 1
scxspl 200 33323 0 33322 9 8 1 7 0 8 0
plimitpl 152 279 0 271 1 0 1 1 0 8 0
sigapl 424 4090 0 4039 6 0 6 6 0 8 0
futexpl 56 29602 0 29602 2 1 1 1 0 8 1
knotepl 112 225 0 205 1 0 1 1 0 8 0
kqueuepl 152 1470 0 1461 1 0 1 1 0 8 0
pipepl 304 337 0 326 6 4 2 2 0 8 1
fdescpl 496 4054 0 4039 3 0 3 3 0 8 0
filepl 152 15084 0 14982 5 0 5 5 0 8 0
lockfpl 104 644 0 643 1 0 1 1 0 8 0
lockfspl 48 262 0 261 1 0 1 1 0 8 0
sessionpl 120 20 0 9 1 0 1 1 0 8 0
pgrppl 48 20 0 9 1 0 1 1 0 8 0
ucredpl 96 2370 0 2359 1 0 1 1 0 8 0
zombiepl 144 4040 0 4039 1 0 1 1 0 8 0
processpl 1008 4090 0 4039 7 0 7 7 0 8 0
procpl 632 8899 0 8841 6 0 6 6 0 8 0
sosppl 144 34 0 33 4 3 1 1 0 8 0
sockpl 400 3375 0 3354 9 6 3 5 0 8 0
mcl64k 65536 17 0 0 3 0 3 3 0 8 0
mcl16k 16384 3 0 0 1 0 1 1 0 8 0
mcl12k 12288 8 0 0 1 0 1 1 0 8 0
mcl9k 9216 6 0 0 1 0 1 1 0 8 0
mcl8k 8192 17 0 0 3 0 3 3 0 8 0
mcl4k 4096 17 0 0 3 0 3 3 0 8 0
mcl2k2 2112 3 0 0 1 0 1 1 0 8 0
mcl2k 2048 204 0 0 16 0 16 16 0 8 0
mtagpl 96 213 0 0 5 0 5 5 0 8 0
mbufpl 256 736 0 0 41 0 41 41 0 8 0
bufpl 280 9111 0 2855 447 0 447 447 0 8 0
anonpl 16 302226 0 295498 50 12 38 44 0 124 10
amapchunkpl 152 16546 0 16364 21 13 8 12 0 158 0
amappl16 192 12831 0 12589 27 12 15 25 0 8 2
amappl15 184 1 0 1 1 1 0 1 0 8 0
amappl14 176 719 0 714 1 0 1 1 0 8 0
amappl13 168 80 0 77 1 0 1 1 0 8 0
amappl12 160 1233 0 1227 1 0 1 1 0 8 0
amappl11 152 61 0 45 1 0 1 1 0 8 0
amappl10 144 1924 0 1920 1 0 1 1 0 8 0
amappl9 136 372 0 371 2 1 1 1 0 8 0
amappl8 128 198 0 134 3 0 3 3 0 8 0
amappl7 120 2176 0 2168 1 0 1 1 0 8 0
amappl6 112 130 0 114 1 0 1 1 0 8 0
amappl5 104 4129 0 4116 1 0 1 1 0 8 0
amappl4 96 321 0 291 1 0 1 1 0 8 0
amappl3 88 810 0 803 1 0 1 1 0 8 0
amappl2 80 28965 0 28900 3 1 2 3 0 8 0
amappl1 72 112194 0 111750 24 14 10 19 0 8 0
amappl 80 9201 0 9138 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 64 129 0 12 2 0 2 2 0 8 0
uaddrrnd 24 4059 0 4039 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 4059 0 4039 1 0 1 1 0 8 0
vmmpekpl 168 20889 0 20837 3 0 3 3 0 8 0
vmmpepl 168 499479 0 498111 99 23 76 81 0 357 7
vmsppl 368 4058 0 4039 2 0 2 2 0 8 0
pdppl 4096 8125 0 8083 6 0 6 6 0 8 0
pvpl 32 1309002 0 1299011 180 65 115 121 0 265 31
pmappl 232 4058 0 4039 3 1 2 2 0 8 0
extentpl 40 53 0 36 1 0 1 1 0 8 0
phpool 112 303 0 24 9 0 9 9 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff823c5d16) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242e558,ffffffff82428da8,207,ffffffff823ce69c) at __assert+0x2b sys/kern/subr_prf.c:162
kcov_remote_enter(0,ffff800020e00010) at kcov_remote_enter+0x155 sys/dev/kcov.c:519
taskq_thread(ffff80000002c000) at taskq_thread+0xd9 sys/kern/kern_task.c:447
end trace frame: 0x0, count: -5
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
x86_ipi_db(ffff800020d80ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352
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(ffffffff8287d618) at __mp_lock+0xa2 read_rflags machine/cpufunc.h:195 [inline]
__mp_lock(ffffffff8287d618) at __mp_lock+0xa2 intr_disable machine/cpufunc.h:216 [inline]
__mp_lock(ffffffff8287d618) at __mp_lock+0xa2 sys/kern/kern_lock.c:142
__mp_acquire_count(ffffffff8287d618,1) at __mp_acquire_count+0x4c sys/kern/kern_lock.c:227
tsleep(fffffd806e8a5c78,118,ffffffff8242319e,3) at tsleep+0x191
kqueue_sleep(fffffd806e8a5c78,ffff800020ea7c10) at kqueue_sleep+0x101 sys/kern/kern_event.c:885
kqueue_scan(fffffd806e8a5c78,40,c0001af638,ffff800020ea7c10,ffff800020ea7b10,ffff800020de64f8) at kqueue_scan+0x280 sys/kern/kern_event.c:932
sys_kevent(ffff800020de64f8,ffff800020ea7cd0,ffff800020ea7d20) at sys_kevent+0x405 sys/kern/kern_event.c:640
syscall(ffff800020ea7da0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800020ea7da0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:570
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xc0001afe38, count: 4
ddb{1}> trace
x86_ipi_db(ffff800020d80ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352
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(ffffffff8287d618) at __mp_lock+0xa2 read_rflags machine/cpufunc.h:195 [inline]
__mp_lock(ffffffff8287d618) at __mp_lock+0xa2 intr_disable machine/cpufunc.h:216 [inline]
__mp_lock(ffffffff8287d618) at __mp_lock+0xa2 sys/kern/kern_lock.c:142
__mp_acquire_count(ffffffff8287d618,1) at __mp_acquire_count+0x4c sys/kern/kern_lock.c:227
tsleep(fffffd806e8a5c78,118,ffffffff8242319e,3) at tsleep+0x191
kqueue_sleep(fffffd806e8a5c78,ffff800020ea7c10) at kqueue_sleep+0x101 sys/kern/kern_event.c:885
kqueue_scan(fffffd806e8a5c78,40,c0001af638,ffff800020ea7c10,ffff800020ea7b10,ffff800020de64f8) at kqueue_scan+0x280 sys/kern/kern_event.c:932
sys_kevent(ffff800020de64f8,ffff800020ea7cd0,ffff800020ea7d20) at sys_kevent+0x405 sys/kern/kern_event.c:640
syscall(ffff800020ea7da0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800020ea7da0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:570
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xc0001afe38, count: -11
---
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syzbot found the following issue on:
HEAD commit: 0a23da6d Add __multi3 from compiler_rt-8.x
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=1328cc6e900000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=1252e696865efc29b767
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+1252e6...@syzkaller.appspotmail.com
panic: kernel diagnostic assertion "curproc->p_kd == NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/dev/kcov.c", line 519
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
436773 67176 0 0x2 0x4000000 1 syz-fuzzer
*220442 34018 0 0x14000 0x200 0 softnet
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff823c5d16) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242e558,ffffffff82428da8,207,ffffffff823ce69c) at __assert+0x2b sys/kern/subr_prf.c:162
kcov_remote_enter(0,ffff800020e00010) at kcov_remote_enter+0x155 sys/dev/kcov.c:519
taskq_thread(ffff80000002c000) at taskq_thread+0xd9 sys/kern/kern_task.c:447
end trace frame: 0x0, count: 10
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
kernel diagnostic assertion "curproc->p_kd == NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/dev/kcov.c", line 519
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff823c5d16) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242e558,ffffffff82428da8,207,ffffffff823ce69c) at __assert+0x2b sys/kern/subr_prf.c:162
kcov_remote_enter(0,ffff800020e00010) at kcov_remote_enter+0x155 sys/dev/kcov.c:519
taskq_thread(ffff80000002c000) at taskq_thread+0xd9 sys/kern/kern_task.c:447
end trace frame: 0x0, count: -5
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff800020db9370
rbx 0xffff800020db9380
rdx 0x8b
rcx 0x2
rax 0x1
r8 0xffff800020db9330
r9 0xffffffff82281826 kprintf+0x146
r10 0x1
r11 0x39a124a08fb7e073
r12 0x3000000008
r13 0xffff800020db9420
r14 0x100
r15 0x1
rip 0xffffffff810d1058 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800020db9360
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (softnet) pid=220442 stat=onproc
flags process=14000<NOZOMBIE,SYSTEM> proc=200<SYSTEM>
pri=32, usrpri=50, nice=20
forw=0xffffffffffffffff, list=0xffff800020d98000,0xffff800020d98500
process=0xffff800020d9abd0 user=0xffff800020db4000, vmspace=0xffffffff828dd1d0
estcpu=0, cpticks=2, pctcpu=0.0
user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
35739 503501 0 0 3 0x14280 nfsidl nfsio
99807 225870 0 0 3 0x14280 nfsidl nfsio
37289 63215 0 0 3 0x14280 nfsidl nfsio
49705 444554 0 0 3 0x14280 nfsidl nfsio
31266 418317 0 0 3 0x14280 nfsidl nfsio
77117 498501 0 0 3 0x14280 nfsidl nfsio
20481 319844 0 0 3 0x14280 nfsidl nfsio
50220 384544 0 0 3 0x14280 nfsidl nfsio
56786 405662 0 0 3 0x14280 nfsidl nfsio
29131 516516 0 0 3 0x14280 nfsidl nfsio
67175 516082 0 0 3 0x14280 nfsidl nfsio
33841 173598 0 0 3 0x14280 nfsidl nfsio
61643 519087 0 0 3 0x14280 nfsidl nfsio
24369 161016 0 0 3 0x14280 nfsidl nfsio
50004 479732 0 0 3 0x14280 nfsidl nfsio
65371 312994 0 0 3 0x14280 nfsidl nfsio
40515 18060 0 0 3 0x14280 nfsidl nfsio
42031 63294 0 0 3 0x14280 nfsidl nfsio
13745 279611 0 0 3 0x14280 nfsidl nfsio
91429 149805 0 0 3 0x14280 nfsidl nfsio
14611 13136 1 0 3 0x100083 ttyin getty
4213 295589 0 0 3 0x14200 bored sosplice
29931 222711 67176 0 3 0x2 biowait syz-executor.1
67176 218385 42612 0 3 0x82 thrsleep syz-fuzzer
67176 295035 42612 0 3 0x4000082 nanosleep syz-fuzzer
67176 298502 42612 0 3 0x4000082 thrsleep syz-fuzzer
67176 75798 42612 0 3 0x4000082 thrsleep syz-fuzzer
67176 82137 42612 0 3 0x4000082 thrsleep syz-fuzzer
67176 119485 42612 0 3 0x4000082 thrsleep syz-fuzzer
67176 149925 42612 0 3 0x4000082 thrsleep syz-fuzzer
67176 436773 42612 0 7 0x4000002 syz-fuzzer
42612 138292 44687 0 3 0x10008a pause ksh
44687 295798 20417 0 3 0x92 select sshd
20417 62940 1 0 3 0x80 select sshd
75219 188046 17950 74 3 0x100092 bpf pflogd
17950 339220 1 0 3 0x80 netio pflogd
19898 382516 70599 73 3 0x100090 kqread syslogd
70599 90017 1 0 3 0x100082 netio syslogd
8880 416429 1 77 3 0x100090 poll dhclient
96598 117557 1 0 3 0x80 poll dhclient
85843 302473 0 0 3 0x14200 bored smr
93090 320378 0 0 3 0x14200 pgzero zerothread
32614 117650 0 0 3 0x14200 aiodoned aiodoned
84810 328165 0 0 3 0x14200 syncer update
49878 66945 0 0 3 0x14200 cleaner cleaner
73150 115159 0 0 3 0x14200 reaper reaper
5368 439020 0 0 3 0x14200 pgdaemon pagedaemon
71554 261983 0 0 3 0x14200 bored crynlk
82955 70660 0 0 3 0x14200 bored crypto
58962 254914 0 0 3 0x40014200 acpi0 acpi0
32889 453822 0 0 3 0x40014200 idle1
*34018 220442 0 0 7 0x14200 softnet
78978 1712 0 0 3 0x14200 bored systqmp
78957 31809 0 0 3 0x14200 bored systq
80725 263291 0 0 3 0x40014200 bored softclock
40615 8407 0 0 3 0x40014200 idle0
1 184438 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex /syzkaller/managers/multicore/kernel/sys/dev/kcov.c:92 r = 0 (0xffffffff826cd048)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164
#1 mtx_enter_try+0x100
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 kcov_remote_enter+0x62 kr_lookup sys/dev/kcov.c:674 [inline]
#3 kcov_remote_enter+0x62 sys/dev/kcov.c:513
#4 taskq_thread+0xd9 sys/kern/kern_task.c:447
#5 proc_trampoline+0x1c
Process 29931 (syz-executor.1) thread 0xffff800020ea1b40 (222711)
exclusive rrwlock inode r = 0 (0xfffffd807a0a8f80)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164
#1 rw_enter+0x446 sys/kern/kern_rwlock.c:311
#2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462
#3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:603
#4 vn_lock+0x6c sys/kern/vfs_vnops.c:575
#5 vget+0x1c6 sys/kern/vfs_subr.c:671
#6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119
#7 ffs_vget+0x6b sys/ufs/ffs/ffs_vfsops.c:1321
#8 ufs_lookup+0x151d sys/ufs/ufs/ufs_lookup.c:487
#9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:90
#10 vfs_lookup+0x708 sys/kern/vfs_lookup.c:568
#11 namei+0x5f7 sys/kern/vfs_lookup.c:249
#12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1853
#13 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#13 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:570
#14 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd806c81a6f8)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164
#1 rw_enter+0x446 sys/kern/kern_rwlock.c:311
#2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462
#3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:603
#4 vn_lock+0x6c sys/kern/vfs_vnops.c:575
#5 vfs_lookup+0xe6 sys/kern/vfs_lookup.c:419
#6 namei+0x5f7 sys/kern/vfs_lookup.c:249
#7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1853
#8 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#8 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:570
#9 Xsyscall+0x128
Process 34018 (softnet) thread 0xffff800020d98278 (220442)
shared rwlock softnet r = 0 (0xffff80000002c070)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164
#1 taskq_thread+0xcb sys/kern/kern_task.c:445
#2 proc_trampoline+0x1c
exclusive mutex /syzkaller/managers/multicore/kernel/sys/dev/kcov.c:92 r = 0 (0xffffffff826cd048)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164
#1 mtx_enter_try+0x100
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 kcov_remote_enter+0x62 kr_lookup sys/dev/kcov.c:674 [inline]
#3 kcov_remote_enter+0x62 sys/dev/kcov.c:513
#4 taskq_thread+0xd9 sys/kern/kern_task.c:447
#5 proc_trampoline+0x1c
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 9536 6456K 7398K 78643K 15099 0
pcb 13 8K 8K 78643K 241 0
rtable 99 5K 6K 78643K 789 0
ifaddr 81 15K 16K 78643K 248 0
counters 45 34K 34K 78643K 97 0
ioctlops 0 0K 4K 78643K 1641 0
iov 0 0K 28K 78643K 175 0
mount 1 1K 1K 78643K 1 0
vnodes 1218 77K 77K 78643K 2750 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 9K 78643K 52 0
VM map 2 1K 1K 78643K 2 0
sem 12 0K 1K 78643K 369 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1824 197K 290K 78643K 13058 0
file desc 4 9K 25K 78643K 3856 0
sigio 0 0K 0K 78643K 57 0
proc 64 63K 95K 78643K 635 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 303 0
in_multi 22 1K 2K 78643K 297 0
ether_multi 1 0K 0K 78643K 50 0
mrt 0 0K 0K 78643K 18 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 55 254K 254K 78643K 55 0
exec 0 0K 2K 78643K 482 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 161 91K 94K 78643K 9701 0
UVM aobj 118 8K 8K 78643K 130 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 201 0
NDP 15 0K 0K 78643K 64 0
temp 144 3967K 4031K 78643K 35554 0
kqueue 3 4K 10K 78643K 126 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 5 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 96 120 0 118 1 0 1 1 0 8 0
rtentry 112 124 0 91 2 1 1 2 0 8 0
unpcb 120 1033 0 1023 1 0 1 1 0 8 0
syncache 272 54 0 54 8 8 0 1 0 8 0
tcpqe 32 15 0 15 3 3 0 1 0 8 0
tcpcb 592 708 0 699 14 12 2 6 0 8 1
inpcb 296 2199 0 2190 5 3 2 3 0 8 1
nd6 48 27 0 24 1 0 1 1 0 8 0
pkpcb 40 23 0 23 3 3 0 1 0 8 0
kcovpl 48 3 0 1 1 0 1 1 0 8 0
ppxss 1136 10 0 9 1 0 1 1 0 8 0
pffrag 232 26 0 26 4 4 0 1 0 482 0
pffrnode 88 26 0 26 4 4 0 1 0 8 0
pffrent 40 750 0 750 4 4 0 1 0 8 0
pfosfp 40 846 0 423 5 0 5 5 0 8 0
pfosfpen 112 1428 0 714 21 0 21 21 0 8 0
pfrktable 1344 61 0 58 1 0 1 1 0 8 0
pftag 88 11 0 10 2 1 1 1 0 8 0
pfstitem 24 116 0 77 1 0 1 1 0 8 0
pfstkey 112 116 0 77 2 0 2 2 0 8 0
pfstate 328 116 0 77 5 1 4 4 0 8 0
pfrule 1360 74 0 51 3 1 2 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 631 0 483 15 5 10 13 0 8 0
art_table 32 632 0 483 2 0 2 2 0 8 0
art_node 16 123 0 93 1 0 1 1 0 8 0
semapl 112 367 0 357 1 0 1 1 0 8 0
shmpl 112 127 0 12 4 0 4 4 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 6537 0 5134 90 1 89 89 0 8 0
ffsino 272 6537 0 5134 95 0 95 95 0 8 0
nchpl 144 11357 0 9768 60 0 60 60 0 8 0
uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0
vnodes 208 5926 0 0 312 0 312 312 0 8 0
namei 1024 28614 0 28614 2 1 1 1 0 8 1
percpumem 16 59 0 26 1 0 1 1 0 8 0
vcpupl 1984 5 0 0 1 0 1 1 0 8 0
vmpool 560 5 0 0 1 0 1 1 0 8 0
pfiaddrpl 120 30 0 25 1 0 1 1 0 8 0
scsiplug 72 4 0 4 1 0 1 1 0 8 1
scxspl 200 33323 0 33322 9 8 1 7 0 8 0
plimitpl 152 279 0 271 1 0 1 1 0 8 0
sigapl 424 4090 0 4039 6 0 6 6 0 8 0
futexpl 56 29602 0 29602 2 1 1 1 0 8 1
knotepl 112 225 0 205 1 0 1 1 0 8 0
kqueuepl 152 1470 0 1461 1 0 1 1 0 8 0
pipepl 304 337 0 326 6 4 2 2 0 8 1
fdescpl 496 4054 0 4039 3 0 3 3 0 8 0
filepl 152 15084 0 14982 5 0 5 5 0 8 0
lockfpl 104 644 0 643 1 0 1 1 0 8 0
lockfspl 48 262 0 261 1 0 1 1 0 8 0
sessionpl 120 20 0 9 1 0 1 1 0 8 0
pgrppl 48 20 0 9 1 0 1 1 0 8 0
ucredpl 96 2370 0 2359 1 0 1 1 0 8 0
zombiepl 144 4040 0 4039 1 0 1 1 0 8 0
processpl 1008 4090 0 4039 7 0 7 7 0 8 0
procpl 632 8899 0 8841 6 0 6 6 0 8 0
sosppl 144 34 0 33 4 3 1 1 0 8 0
sockpl 400 3375 0 3354 9 6 3 5 0 8 0
mcl64k 65536 17 0 0 3 0 3 3 0 8 0
mcl16k 16384 3 0 0 1 0 1 1 0 8 0
mcl12k 12288 8 0 0 1 0 1 1 0 8 0
mcl9k 9216 6 0 0 1 0 1 1 0 8 0
mcl8k 8192 17 0 0 3 0 3 3 0 8 0
mcl4k 4096 17 0 0 3 0 3 3 0 8 0
mcl2k2 2112 3 0 0 1 0 1 1 0 8 0
mcl2k 2048 204 0 0 16 0 16 16 0 8 0
mtagpl 96 213 0 0 5 0 5 5 0 8 0
mbufpl 256 736 0 0 41 0 41 41 0 8 0
bufpl 280 9111 0 2855 447 0 447 447 0 8 0
anonpl 16 302226 0 295498 50 12 38 44 0 124 10
amapchunkpl 152 16546 0 16364 21 13 8 12 0 158 0
amappl16 192 12831 0 12589 27 12 15 25 0 8 2
amappl15 184 1 0 1 1 1 0 1 0 8 0
amappl14 176 719 0 714 1 0 1 1 0 8 0
amappl13 168 80 0 77 1 0 1 1 0 8 0
amappl12 160 1233 0 1227 1 0 1 1 0 8 0
amappl11 152 61 0 45 1 0 1 1 0 8 0
amappl10 144 1924 0 1920 1 0 1 1 0 8 0
amappl9 136 372 0 371 2 1 1 1 0 8 0
amappl8 128 198 0 134 3 0 3 3 0 8 0
amappl7 120 2176 0 2168 1 0 1 1 0 8 0
amappl6 112 130 0 114 1 0 1 1 0 8 0
amappl5 104 4129 0 4116 1 0 1 1 0 8 0
amappl4 96 321 0 291 1 0 1 1 0 8 0
amappl3 88 810 0 803 1 0 1 1 0 8 0
amappl2 80 28965 0 28900 3 1 2 3 0 8 0
amappl1 72 112194 0 111750 24 14 10 19 0 8 0
amappl 80 9201 0 9138 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 64 129 0 12 2 0 2 2 0 8 0
uaddrrnd 24 4059 0 4039 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 4059 0 4039 1 0 1 1 0 8 0
vmmpekpl 168 20889 0 20837 3 0 3 3 0 8 0
vmmpepl 168 499479 0 498111 99 23 76 81 0 357 7
vmsppl 368 4058 0 4039 2 0 2 2 0 8 0
pdppl 4096 8125 0 8083 6 0 6 6 0 8 0
pvpl 32 1309002 0 1299011 180 65 115 121 0 265 31
pmappl 232 4058 0 4039 3 1 2 2 0 8 0
extentpl 40 53 0 36 1 0 1 1 0 8 0
phpool 112 303 0 24 9 0 9 9 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff823c5d16) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242e558,ffffffff82428da8,207,ffffffff823ce69c) at __assert+0x2b sys/kern/subr_prf.c:162
kcov_remote_enter(0,ffff800020e00010) at kcov_remote_enter+0x155 sys/dev/kcov.c:519
taskq_thread(ffff80000002c000) at taskq_thread+0xd9 sys/kern/kern_task.c:447
end trace frame: 0x0, count: -5
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
x86_ipi_db(ffff800020d80ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352
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(ffffffff8287d618) at __mp_lock+0xa2 read_rflags machine/cpufunc.h:195 [inline]
__mp_lock(ffffffff8287d618) at __mp_lock+0xa2 intr_disable machine/cpufunc.h:216 [inline]
__mp_lock(ffffffff8287d618) at __mp_lock+0xa2 sys/kern/kern_lock.c:142
__mp_acquire_count(ffffffff8287d618,1) at __mp_acquire_count+0x4c sys/kern/kern_lock.c:227
tsleep(fffffd806e8a5c78,118,ffffffff8242319e,3) at tsleep+0x191
kqueue_sleep(fffffd806e8a5c78,ffff800020ea7c10) at kqueue_sleep+0x101 sys/kern/kern_event.c:885
kqueue_scan(fffffd806e8a5c78,40,c0001af638,ffff800020ea7c10,ffff800020ea7b10,ffff800020de64f8) at kqueue_scan+0x280 sys/kern/kern_event.c:932
sys_kevent(ffff800020de64f8,ffff800020ea7cd0,ffff800020ea7d20) at sys_kevent+0x405 sys/kern/kern_event.c:640
syscall(ffff800020ea7da0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800020ea7da0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:570
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xc0001afe38, count: 4
ddb{1}> trace
x86_ipi_db(ffff800020d80ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352
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(ffffffff8287d618) at __mp_lock+0xa2 read_rflags machine/cpufunc.h:195 [inline]
__mp_lock(ffffffff8287d618) at __mp_lock+0xa2 intr_disable machine/cpufunc.h:216 [inline]
__mp_lock(ffffffff8287d618) at __mp_lock+0xa2 sys/kern/kern_lock.c:142
__mp_acquire_count(ffffffff8287d618,1) at __mp_acquire_count+0x4c sys/kern/kern_lock.c:227
tsleep(fffffd806e8a5c78,118,ffffffff8242319e,3) at tsleep+0x191
kqueue_sleep(fffffd806e8a5c78,ffff800020ea7c10) at kqueue_sleep+0x101 sys/kern/kern_event.c:885
kqueue_scan(fffffd806e8a5c78,40,c0001af638,ffff800020ea7c10,ffff800020ea7b10,ffff800020de64f8) at kqueue_scan+0x280 sys/kern/kern_event.c:932
sys_kevent(ffff800020de64f8,ffff800020ea7cd0,ffff800020ea7d20) at sys_kevent+0x405 sys/kern/kern_event.c:640
syscall(ffff800020ea7da0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800020ea7da0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:570
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xc0001afe38, count: -11
---
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