assert "(key.from) > 0 && (key.from) <= w_max_used_index && (key.from) < witness_count" failed in subr_witness.c
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syzbot
Sep 20, 2020, 9:47:22 AM9/20/20
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: b2aa37de cap channel input buffer size at 16MB; avoids hig..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=11e4aac3900000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=925788b12a7d867566e2
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+925788...@syzkaller.appspotmail.com
login: panic: kernel diagnostic assertion "(key.from) > 0 && (key.from) <= w_max_used_index && (key.from) < witness_count" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/subr_witness.c", line 2446
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
522409 25718 0 0 0 1 syz-executor.1
*470861 93450 0 0x2 0 0K syz-executor.0
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff823c0150) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242f13f,ffffffff82414f7c,98e,ffffffff823b3d8d) at __assert+0x2b sys/kern/subr_prf.c:162
witness_checkorder(ffffffff8277f738,9,0) at witness_checkorder+0x1112 find_instance sys/kern/subr_witness.c:1840 [inline]
witness_checkorder(ffffffff8277f738,9,0) at witness_checkorder+0x1112 sys/kern/subr_witness.c:837
mtx_enter(ffffffff8277f728) at mtx_enter+0x3a sys/kern/kern_lock.c:265
vm_map_lock_ln(ffffffff8277f6f0,ffffffff823e4471,135) at vm_map_lock_ln+0x118 sys/uvm/uvm_map.c:5461
malloc(e10,27,9) at malloc+0x739 sys/kern/kern_malloc.c:310
fdcopy(ffff800020ecebd8) at fdcopy+0x207 sys/kern/kern_descrip.c:1138
process_new(ffff800020ea78c8,ffff800020ecebd8,1) at process_new+0x12c sys/kern/kern_fork.c:253
fork1(ffff800020ea6c70,1,ffffffff813ce540,0,ffff800024176e80,0) at fork1+0x313 sys/kern/kern_fork.c:377
syscall(ffff800024176f00) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800024176f00) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:568
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffda4c0, 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
kernel diagnostic assertion "(key.from) > 0 && (key.from) <= w_max_used_index && (key.from) < witness_count" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/subr_witness.c", line 2446
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff823c0150) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242f13f,ffffffff82414f7c,98e,ffffffff823b3d8d) at __assert+0x2b sys/kern/subr_prf.c:162
witness_checkorder(ffffffff8277f738,9,0) at witness_checkorder+0x1112 find_instance sys/kern/subr_witness.c:1840 [inline]
witness_checkorder(ffffffff8277f738,9,0) at witness_checkorder+0x1112 sys/kern/subr_witness.c:837
mtx_enter(ffffffff8277f728) at mtx_enter+0x3a sys/kern/kern_lock.c:265
vm_map_lock_ln(ffffffff8277f6f0,ffffffff823e4471,135) at vm_map_lock_ln+0x118 sys/uvm/uvm_map.c:5461
malloc(e10,27,9) at malloc+0x739 sys/kern/kern_malloc.c:310
fdcopy(ffff800020ecebd8) at fdcopy+0x207 sys/kern/kern_descrip.c:1138
process_new(ffff800020ea78c8,ffff800020ecebd8,1) at process_new+0x12c sys/kern/kern_fork.c:253
fork1(ffff800020ea6c70,1,ffffffff813ce540,0,ffff800024176e80,0) at fork1+0x313 sys/kern/kern_fork.c:377
syscall(ffff800024176f00) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800024176f00) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:568
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffda4c0, count: -12
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff8000241769b0
rbx 0xffff8000241769c0
rdx 0x8b
rcx 0x2
rax 0x1
r8 0xffff800024176970
r9 0xffffffff8106d396 kprintf+0x146
r10 0x1
r11 0xec91c6e45e1a2564
r12 0x3000000008
r13 0xffff800024176a60
r14 0x100
r15 0x1
rip 0xffffffff819987f8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff8000241769a0
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor.0) pid=470861 stat=onproc
flags process=2<EXEC,8ORPHAN> proc=0
pri=79, usrpri=79, nice=20
forw=0xffffffffffffffff, list=0xffff800020ea7160,0xffff800020ea7b50
process=0xffff800020ecebd8 user=0xffff800024171000, vmspace=0xfffffd806a505198
estcpu=36, cpticks=0, pctcpu=0.48
user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
25718 522409 21136 0 7 0 syz-executor.1
25718 194565 21136 0 3 0x4000080 netcon2 syz-executor.1
21136 345212 17830 0 3 0x82 nanosleep syz-executor.1
*93450 470861 17830 0 7 0x2 syz-executor.0
97264 83554 1 0 3 0x100083 ttyin getty
18090 465666 0 0 3 0x14200 bored sosplice
17830 312135 22311 0 3 0x82 thrsleep syz-fuzzer
17830 140533 22311 0 3 0x4000082 nanosleep syz-fuzzer
17830 74337 22311 0 3 0x4000082 thrsleep syz-fuzzer
17830 297271 22311 0 3 0x4000082 thrsleep syz-fuzzer
17830 510 22311 0 3 0x4000082 kqread syz-fuzzer
17830 455875 22311 0 3 0x4000082 nanosleep syz-fuzzer
17830 218344 22311 0 3 0x4000082 thrsleep syz-fuzzer
17830 290665 22311 0 3 0x4000082 thrsleep syz-fuzzer
22311 294125 36105 0 3 0x10008a pause ksh
36105 214513 76119 0 3 0x92 select sshd
76119 368103 1 0 3 0x80 select sshd
53539 353972 5489 74 3 0x100092 bpf pflogd
5489 70072 1 0 3 0x80 netio pflogd
70370 152894 78249 73 3 0x100090 kqread syslogd
78249 464849 1 0 3 0x100082 netio syslogd
29227 306214 1 77 3 0x100090 poll dhclient
55632 72679 1 0 3 0x80 poll dhclient
29765 259784 0 0 3 0x14200 bored smr
25594 184168 0 0 3 0x14200 pgzero zerothread
51459 191433 0 0 3 0x14200 aiodoned aiodoned
11294 814 0 0 3 0x14200 syncer update
68467 134604 0 0 3 0x14200 cleaner cleaner
16610 183162 0 0 3 0x14200 reaper reaper
36826 499118 0 0 3 0x14200 pgdaemon pagedaemon
82753 417911 0 0 3 0x14200 bored crynlk
93569 337356 0 0 3 0x14200 bored crypto
36618 189028 0 0 3 0x40014200 acpi0 acpi0
3572 487446 0 0 3 0x40014200 idle1
32663 507102 0 0 3 0x14200 bored softnet
17984 415071 0 0 3 0x14200 bored systqmp
88650 258919 0 0 3 0x14200 bored systq
72686 219382 0 0 3 0x40014200 bored softclock
76944 451641 0 0 3 0x40014200 idle0
1 325586 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/kern/kern_malloc.c:104 r = 0 (0xffffffff826c5c30)
#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 malloc+0x23b sys/kern/kern_malloc.c:209
#4 fdcopy+0x207 sys/kern/kern_descrip.c:1138
#5 process_new+0x12c sys/kern/kern_fork.c:253
#6 fork1+0x313 sys/kern/kern_fork.c:377
#7 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#7 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:568
#8 Xsyscall+0x128
Process 93450 (syz-executor.0) thread 0xffff800020ea6c70 (470861)
exclusive rwlock fdlock r = 0 (0xfffffd8072c5da18)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164
#1 fdcopy+0x137 sys/kern/kern_descrip.c:1114
#2 process_new+0x12c sys/kern/kern_fork.c:253
#3 fork1+0x313 sys/kern/kern_fork.c:377
#4 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#4 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:568
#5 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828a2688)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164
#1 syscall+0x3fd mi_syscall sys/sys/syscall_mi.h:93 [inline]
#1 syscall+0x3fd sys/arch/amd64/amd64/trap.c:568
#2 Xsyscall+0x128
exclusive mutex /syzkaller/managers/multicore/kernel/sys/kern/kern_malloc.c:104 r = 0 (0xffffffff826c5c30)
#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 malloc+0x23b sys/kern/kern_malloc.c:209
#4 fdcopy+0x207 sys/kern/kern_descrip.c:1138
#5 process_new+0x12c sys/kern/kern_fork.c:253
#6 fork1+0x313 sys/kern/kern_fork.c:377
#7 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#7 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:568
#8 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 9543 6447K 7696K 78643K 20342 0
pcb 13 8K 8K 78643K 451 0
rtable 118 6K 7K 78643K 1614 0
ifaddr 88 17K 18K 78643K 588 0
counters 43 33K 34K 78643K 201 0
ioctlops 0 0K 4K 78643K 2011 0
iov 0 0K 24K 78643K 384 0
mount 1 1K 1K 78643K 1 0
vnodes 1226 77K 77K 78643K 4345 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 9K 78643K 60 0
VM map 2 1K 1K 78643K 2 0
sem 12 0K 0K 78643K 1091 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1824 197K 290K 78643K 13058 0
file desc 5 17K 25K 78643K 9270 0
sigio 0 0K 0K 78643K 106 0
proc 65 63K 95K 78643K 1061 0
subproc 32 2K 2K 78643K 136 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 640 0
in_multi 29 1K 2K 78643K 434 0
ether_multi 1 0K 0K 78643K 59 0
mrt 0 0K 0K 78643K 57 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 67 307K 307K 78643K 67 0
exec 0 0K 2K 78643K 840 0
pfkey data 0 0K 0K 78643K 2 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 271 318K 319K 78643K 23248 0
UVM aobj 129 8K 8K 78643K 129 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 336 0
NDP 15 0K 0K 78643K 124 0
temp 151 3980K 4060K 78643K 41668 0
kqueue 3 4K 22K 78643K 398 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 19 0 13 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 96 317 0 315 1 0 1 1 0 8 0
rtentry 112 195 0 154 2 0 2 2 0 8 0
unpcb 120 1911 0 1893 2 1 1 2 0 8 0
syncache 272 55 0 55 11 10 1 1 0 8 1
tcpqe 32 35 0 35 5 5 0 1 0 8 0
tcpcb 592 1470 0 1463 20 18 2 5 0 8 0
inpcb 296 4184 0 4168 13 11 2 3 0 8 0
rttmr 72 14 0 14 1 1 0 1 0 8 0
nd6 48 62 0 58 1 0 1 1 0 8 0
pkpcb 40 47 0 47 9 9 0 1 0 8 0
kcovpl 48 8 0 6 1 0 1 1 0 8 0
ppxss 1128 9 0 9 3 3 0 1 0 8 0
pfstscr 40 21 0 21 3 3 0 1 0 8 0
pffrag 232 24 0 22 4 3 1 1 0 482 0
pffrnode 88 24 0 22 4 3 1 1 0 8 0
pffrent 40 493 0 491 6 5 1 1 0 8 0
pfosfp 40 858 0 423 5 0 5 5 0 8 0
pfosfpen 112 1443 0 714 21 0 21 21 0 8 0
pfrktable 1344 165 0 161 2 1 1 1 0 8 0
pftag 88 1 0 0 1 0 1 1 0 8 0
pfstitem 24 81 0 78 1 0 1 1 0 8 0
pfstkey 112 117 0 114 2 0 2 2 0 8 0
pfstate 328 97 0 94 5 3 2 5 0 8 0
pfrule 1360 118 0 88 4 1 3 3 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 592 0 416 16 3 13 13 0 8 0
art_table 32 593 0 416 2 0 2 2 0 8 0
art_node 16 186 0 148 1 0 1 1 0 8 0
sysvmsgpl 40 45 0 16 1 0 1 1 0 8 0
semapl 112 1089 0 1079 1 0 1 1 0 8 0
shmpl 112 126 0 0 4 0 4 4 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 12805 0 11379 91 1 90 90 0 8 0
ffsino 272 12805 0 11379 97 1 96 96 0 8 0
nchpl 144 24130 0 22538 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 61479 0 61479 3 2 1 1 0 8 1
percpumem 16 111 0 79 1 0 1 1 0 8 0
vcpupl 1984 32 0 0 4 0 4 4 0 8 0
vmpool 560 41 0 9 3 0 3 3 0 8 0
pfiaddrpl 120 61 0 56 3 2 1 1 0 8 0
scxspl 200 76077 0 76077 19 18 1 7 0 8 1
plimitpl 152 445 0 437 1 0 1 1 0 8 0
sigapl 424 9470 0 9438 4 0 4 4 0 8 0
futexpl 56 73011 0 73011 3 2 1 1 0 8 1
knotepl 112 668 0 648 2 1 1 2 0 8 0
kqueuepl 152 5998 0 5979 2 0 2 2 0 8 1
pipepl 304 543 0 532 16 14 2 2 0 8 1
fdescpl 496 9455 0 9438 3 0 3 3 0 8 0
filepl 152 35107 0 35004 6 1 5 6 0 8 1
lockfpl 104 1192 0 1191 1 0 1 1 0 8 0
lockfspl 48 477 0 476 1 0 1 1 0 8 0
sessionpl 120 26 0 15 1 0 1 1 0 8 0
pgrppl 48 37 0 26 1 0 1 1 0 8 0
ucredpl 96 4921 0 4909 1 0 1 1 0 8 0
zombiepl 144 9438 0 9438 2 1 1 1 0 8 1
processpl 1008 9471 0 9438 5 0 5 5 0 8 0
procpl 632 21632 0 21591 4 0 4 4 0 8 0
sosppl 144 86 0 86 11 10 1 1 0 8 1
sockpl 400 6472 0 6426 18 12 6 7 0 8 0
mcl64k 65536 269 0 0 34 16 18 34 0 8 0
mcl16k 16384 5 0 0 1 0 1 1 0 8 0
mcl12k 12288 17 0 0 2 0 2 2 0 8 0
mcl9k 9216 15 0 0 2 0 2 2 0 8 0
mcl8k 8192 34 0 0 5 3 2 3 0 8 0
mcl4k 4096 18 0 0 3 0 3 3 0 8 0
mcl2k2 2112 6 0 0 1 0 1 1 0 8 0
mcl2k 2048 331 0 0 16 0 16 16 0 8 0
mtagpl 96 447 0 0 11 0 11 11 0 8 0
mbufpl 256 1153 0 0 64 0 64 64 0 8 0
bufpl 280 19821 0 13548 449 0 449 449 0 8 0
anonpl 16 833271 0 819886 132 74 58 65 0 124 3
amapchunkpl 152 44563 0 44262 49 32 17 25 0 158 4
amappl16 192 31930 0 31387 89 60 29 36 0 8 1
amappl15 184 2312 0 2310 1 0 1 1 0 8 0
amappl14 176 338 0 333 1 0 1 1 0 8 0
amappl13 168 315 0 313 1 0 1 1 0 8 0
amappl12 160 2104 0 2097 1 0 1 1 0 8 0
amappl11 152 3830 0 3815 1 0 1 1 0 8 0
amappl10 144 247 0 239 1 0 1 1 0 8 0
amappl9 136 644 0 643 2 1 1 1 0 8 0
amappl8 128 785 0 647 7 2 5 5 0 8 0
amappl7 120 560 0 548 1 0 1 1 0 8 0
amappl6 112 3905 0 3884 1 0 1 1 0 8 0
amappl5 104 7901 0 7889 1 0 1 1 0 8 0
amappl4 96 4358 0 4323 1 0 1 1 0 8 0
amappl3 88 589 0 584 1 0 1 1 0 8 0
amappl2 80 68116 0 68036 3 1 2 3 0 8 0
amappl1 72 262497 0 262027 23 13 10 19 0 8 0
amappl 80 22128 0 22035 3 0 3 3 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 64 128 0 0 3 0 3 3 0 8 0
uaddrrnd 24 9495 0 9447 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 9495 0 9447 1 0 1 1 0 8 0
vmmpekpl 168 39784 0 39734 4 1 3 3 0 8 0
vmmpepl 168 1168188 0 1166226 165 65 100 102 0 357 11
vmsppl 368 9494 0 9447 6 1 5 5 0 8 0
pdppl 4096 18997 0 18926 12 2 10 10 0 8 1
pvpl 32 3504382 0 3490804 304 177 127 139 0 265 17
pmappl 232 9494 0 9447 4 1 3 3 0 8 0
extentpl 40 53 0 36 1 0 1 1 0 8 0
phpool 112 387 0 54 10 0 10 10 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(ffffffff823c0150) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242f13f,ffffffff82414f7c,98e,ffffffff823b3d8d) at __assert+0x2b sys/kern/subr_prf.c:162
witness_checkorder(ffffffff8277f738,9,0) at witness_checkorder+0x1112 find_instance sys/kern/subr_witness.c:1840 [inline]
witness_checkorder(ffffffff8277f738,9,0) at witness_checkorder+0x1112 sys/kern/subr_witness.c:837
mtx_enter(ffffffff8277f728) at mtx_enter+0x3a sys/kern/kern_lock.c:265
vm_map_lock_ln(ffffffff8277f6f0,ffffffff823e4471,135) at vm_map_lock_ln+0x118 sys/uvm/uvm_map.c:5461
malloc(e10,27,9) at malloc+0x739 sys/kern/kern_malloc.c:310
fdcopy(ffff800020ecebd8) at fdcopy+0x207 sys/kern/kern_descrip.c:1138
process_new(ffff800020ea78c8,ffff800020ecebd8,1) at process_new+0x12c sys/kern/kern_fork.c:253
fork1(ffff800020ea6c70,1,ffffffff813ce540,0,ffff800024176e80,0) at fork1+0x313 sys/kern/kern_fork.c:377
syscall(ffff800024176f00) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800024176f00) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:568
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffda4c0, count: -12
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(ffffffff828a2480) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff828a2480) at __mp_lock+0x129 sys/kern/kern_lock.c:147
syscall(ffff800022b02250) at syscall+0x3fd mi_syscall sys/sys/syscall_mi.h:93 [inline]
syscall(ffff800022b02250) at syscall+0x3fd sys/arch/amd64/amd64/trap.c:568
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffe89a0, count: 9
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(ffffffff828a2480) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff828a2480) at __mp_lock+0x129 sys/kern/kern_lock.c:147
syscall(ffff800022b02250) at syscall+0x3fd mi_syscall sys/sys/syscall_mi.h:93 [inline]
syscall(ffff800022b02250) at syscall+0x3fd sys/arch/amd64/amd64/trap.c:568
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffe89a0, count: -6
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
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https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following issue on:
HEAD commit: b2aa37de cap channel input buffer size at 16MB; avoids hig..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=11e4aac3900000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=925788b12a7d867566e2
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+925788...@syzkaller.appspotmail.com
login: panic: kernel diagnostic assertion "(key.from) > 0 && (key.from) <= w_max_used_index && (key.from) < witness_count" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/subr_witness.c", line 2446
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
522409 25718 0 0 0 1 syz-executor.1
*470861 93450 0 0x2 0 0K syz-executor.0
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff823c0150) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242f13f,ffffffff82414f7c,98e,ffffffff823b3d8d) at __assert+0x2b sys/kern/subr_prf.c:162
witness_checkorder(ffffffff8277f738,9,0) at witness_checkorder+0x1112 find_instance sys/kern/subr_witness.c:1840 [inline]
witness_checkorder(ffffffff8277f738,9,0) at witness_checkorder+0x1112 sys/kern/subr_witness.c:837
mtx_enter(ffffffff8277f728) at mtx_enter+0x3a sys/kern/kern_lock.c:265
vm_map_lock_ln(ffffffff8277f6f0,ffffffff823e4471,135) at vm_map_lock_ln+0x118 sys/uvm/uvm_map.c:5461
malloc(e10,27,9) at malloc+0x739 sys/kern/kern_malloc.c:310
fdcopy(ffff800020ecebd8) at fdcopy+0x207 sys/kern/kern_descrip.c:1138
process_new(ffff800020ea78c8,ffff800020ecebd8,1) at process_new+0x12c sys/kern/kern_fork.c:253
fork1(ffff800020ea6c70,1,ffffffff813ce540,0,ffff800024176e80,0) at fork1+0x313 sys/kern/kern_fork.c:377
syscall(ffff800024176f00) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800024176f00) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:568
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffda4c0, 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
kernel diagnostic assertion "(key.from) > 0 && (key.from) <= w_max_used_index && (key.from) < witness_count" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/subr_witness.c", line 2446
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff823c0150) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242f13f,ffffffff82414f7c,98e,ffffffff823b3d8d) at __assert+0x2b sys/kern/subr_prf.c:162
witness_checkorder(ffffffff8277f738,9,0) at witness_checkorder+0x1112 find_instance sys/kern/subr_witness.c:1840 [inline]
witness_checkorder(ffffffff8277f738,9,0) at witness_checkorder+0x1112 sys/kern/subr_witness.c:837
mtx_enter(ffffffff8277f728) at mtx_enter+0x3a sys/kern/kern_lock.c:265
vm_map_lock_ln(ffffffff8277f6f0,ffffffff823e4471,135) at vm_map_lock_ln+0x118 sys/uvm/uvm_map.c:5461
malloc(e10,27,9) at malloc+0x739 sys/kern/kern_malloc.c:310
fdcopy(ffff800020ecebd8) at fdcopy+0x207 sys/kern/kern_descrip.c:1138
process_new(ffff800020ea78c8,ffff800020ecebd8,1) at process_new+0x12c sys/kern/kern_fork.c:253
fork1(ffff800020ea6c70,1,ffffffff813ce540,0,ffff800024176e80,0) at fork1+0x313 sys/kern/kern_fork.c:377
syscall(ffff800024176f00) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800024176f00) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:568
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffda4c0, count: -12
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff8000241769b0
rbx 0xffff8000241769c0
rdx 0x8b
rcx 0x2
rax 0x1
r8 0xffff800024176970
r9 0xffffffff8106d396 kprintf+0x146
r10 0x1
r11 0xec91c6e45e1a2564
r12 0x3000000008
r13 0xffff800024176a60
r14 0x100
r15 0x1
rip 0xffffffff819987f8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff8000241769a0
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor.0) pid=470861 stat=onproc
flags process=2<EXEC,8ORPHAN> proc=0
pri=79, usrpri=79, nice=20
forw=0xffffffffffffffff, list=0xffff800020ea7160,0xffff800020ea7b50
process=0xffff800020ecebd8 user=0xffff800024171000, vmspace=0xfffffd806a505198
estcpu=36, cpticks=0, pctcpu=0.48
user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
25718 522409 21136 0 7 0 syz-executor.1
25718 194565 21136 0 3 0x4000080 netcon2 syz-executor.1
21136 345212 17830 0 3 0x82 nanosleep syz-executor.1
*93450 470861 17830 0 7 0x2 syz-executor.0
97264 83554 1 0 3 0x100083 ttyin getty
18090 465666 0 0 3 0x14200 bored sosplice
17830 312135 22311 0 3 0x82 thrsleep syz-fuzzer
17830 140533 22311 0 3 0x4000082 nanosleep syz-fuzzer
17830 74337 22311 0 3 0x4000082 thrsleep syz-fuzzer
17830 297271 22311 0 3 0x4000082 thrsleep syz-fuzzer
17830 510 22311 0 3 0x4000082 kqread syz-fuzzer
17830 455875 22311 0 3 0x4000082 nanosleep syz-fuzzer
17830 218344 22311 0 3 0x4000082 thrsleep syz-fuzzer
17830 290665 22311 0 3 0x4000082 thrsleep syz-fuzzer
22311 294125 36105 0 3 0x10008a pause ksh
36105 214513 76119 0 3 0x92 select sshd
76119 368103 1 0 3 0x80 select sshd
53539 353972 5489 74 3 0x100092 bpf pflogd
5489 70072 1 0 3 0x80 netio pflogd
70370 152894 78249 73 3 0x100090 kqread syslogd
78249 464849 1 0 3 0x100082 netio syslogd
29227 306214 1 77 3 0x100090 poll dhclient
55632 72679 1 0 3 0x80 poll dhclient
29765 259784 0 0 3 0x14200 bored smr
25594 184168 0 0 3 0x14200 pgzero zerothread
51459 191433 0 0 3 0x14200 aiodoned aiodoned
11294 814 0 0 3 0x14200 syncer update
68467 134604 0 0 3 0x14200 cleaner cleaner
16610 183162 0 0 3 0x14200 reaper reaper
36826 499118 0 0 3 0x14200 pgdaemon pagedaemon
82753 417911 0 0 3 0x14200 bored crynlk
93569 337356 0 0 3 0x14200 bored crypto
36618 189028 0 0 3 0x40014200 acpi0 acpi0
3572 487446 0 0 3 0x40014200 idle1
32663 507102 0 0 3 0x14200 bored softnet
17984 415071 0 0 3 0x14200 bored systqmp
88650 258919 0 0 3 0x14200 bored systq
72686 219382 0 0 3 0x40014200 bored softclock
76944 451641 0 0 3 0x40014200 idle0
1 325586 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/kern/kern_malloc.c:104 r = 0 (0xffffffff826c5c30)
#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 malloc+0x23b sys/kern/kern_malloc.c:209
#4 fdcopy+0x207 sys/kern/kern_descrip.c:1138
#5 process_new+0x12c sys/kern/kern_fork.c:253
#6 fork1+0x313 sys/kern/kern_fork.c:377
#7 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#7 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:568
#8 Xsyscall+0x128
Process 93450 (syz-executor.0) thread 0xffff800020ea6c70 (470861)
exclusive rwlock fdlock r = 0 (0xfffffd8072c5da18)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164
#1 fdcopy+0x137 sys/kern/kern_descrip.c:1114
#2 process_new+0x12c sys/kern/kern_fork.c:253
#3 fork1+0x313 sys/kern/kern_fork.c:377
#4 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#4 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:568
#5 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828a2688)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164
#1 syscall+0x3fd mi_syscall sys/sys/syscall_mi.h:93 [inline]
#1 syscall+0x3fd sys/arch/amd64/amd64/trap.c:568
#2 Xsyscall+0x128
exclusive mutex /syzkaller/managers/multicore/kernel/sys/kern/kern_malloc.c:104 r = 0 (0xffffffff826c5c30)
#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 malloc+0x23b sys/kern/kern_malloc.c:209
#4 fdcopy+0x207 sys/kern/kern_descrip.c:1138
#5 process_new+0x12c sys/kern/kern_fork.c:253
#6 fork1+0x313 sys/kern/kern_fork.c:377
#7 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#7 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:568
#8 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 9543 6447K 7696K 78643K 20342 0
pcb 13 8K 8K 78643K 451 0
rtable 118 6K 7K 78643K 1614 0
ifaddr 88 17K 18K 78643K 588 0
counters 43 33K 34K 78643K 201 0
ioctlops 0 0K 4K 78643K 2011 0
iov 0 0K 24K 78643K 384 0
mount 1 1K 1K 78643K 1 0
vnodes 1226 77K 77K 78643K 4345 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 9K 78643K 60 0
VM map 2 1K 1K 78643K 2 0
sem 12 0K 0K 78643K 1091 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1824 197K 290K 78643K 13058 0
file desc 5 17K 25K 78643K 9270 0
sigio 0 0K 0K 78643K 106 0
proc 65 63K 95K 78643K 1061 0
subproc 32 2K 2K 78643K 136 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 640 0
in_multi 29 1K 2K 78643K 434 0
ether_multi 1 0K 0K 78643K 59 0
mrt 0 0K 0K 78643K 57 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 67 307K 307K 78643K 67 0
exec 0 0K 2K 78643K 840 0
pfkey data 0 0K 0K 78643K 2 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 271 318K 319K 78643K 23248 0
UVM aobj 129 8K 8K 78643K 129 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 336 0
NDP 15 0K 0K 78643K 124 0
temp 151 3980K 4060K 78643K 41668 0
kqueue 3 4K 22K 78643K 398 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 19 0 13 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 96 317 0 315 1 0 1 1 0 8 0
rtentry 112 195 0 154 2 0 2 2 0 8 0
unpcb 120 1911 0 1893 2 1 1 2 0 8 0
syncache 272 55 0 55 11 10 1 1 0 8 1
tcpqe 32 35 0 35 5 5 0 1 0 8 0
tcpcb 592 1470 0 1463 20 18 2 5 0 8 0
inpcb 296 4184 0 4168 13 11 2 3 0 8 0
rttmr 72 14 0 14 1 1 0 1 0 8 0
nd6 48 62 0 58 1 0 1 1 0 8 0
pkpcb 40 47 0 47 9 9 0 1 0 8 0
kcovpl 48 8 0 6 1 0 1 1 0 8 0
ppxss 1128 9 0 9 3 3 0 1 0 8 0
pfstscr 40 21 0 21 3 3 0 1 0 8 0
pffrag 232 24 0 22 4 3 1 1 0 482 0
pffrnode 88 24 0 22 4 3 1 1 0 8 0
pffrent 40 493 0 491 6 5 1 1 0 8 0
pfosfp 40 858 0 423 5 0 5 5 0 8 0
pfosfpen 112 1443 0 714 21 0 21 21 0 8 0
pfrktable 1344 165 0 161 2 1 1 1 0 8 0
pftag 88 1 0 0 1 0 1 1 0 8 0
pfstitem 24 81 0 78 1 0 1 1 0 8 0
pfstkey 112 117 0 114 2 0 2 2 0 8 0
pfstate 328 97 0 94 5 3 2 5 0 8 0
pfrule 1360 118 0 88 4 1 3 3 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 592 0 416 16 3 13 13 0 8 0
art_table 32 593 0 416 2 0 2 2 0 8 0
art_node 16 186 0 148 1 0 1 1 0 8 0
sysvmsgpl 40 45 0 16 1 0 1 1 0 8 0
semapl 112 1089 0 1079 1 0 1 1 0 8 0
shmpl 112 126 0 0 4 0 4 4 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 12805 0 11379 91 1 90 90 0 8 0
ffsino 272 12805 0 11379 97 1 96 96 0 8 0
nchpl 144 24130 0 22538 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 61479 0 61479 3 2 1 1 0 8 1
percpumem 16 111 0 79 1 0 1 1 0 8 0
vcpupl 1984 32 0 0 4 0 4 4 0 8 0
vmpool 560 41 0 9 3 0 3 3 0 8 0
pfiaddrpl 120 61 0 56 3 2 1 1 0 8 0
scxspl 200 76077 0 76077 19 18 1 7 0 8 1
plimitpl 152 445 0 437 1 0 1 1 0 8 0
sigapl 424 9470 0 9438 4 0 4 4 0 8 0
futexpl 56 73011 0 73011 3 2 1 1 0 8 1
knotepl 112 668 0 648 2 1 1 2 0 8 0
kqueuepl 152 5998 0 5979 2 0 2 2 0 8 1
pipepl 304 543 0 532 16 14 2 2 0 8 1
fdescpl 496 9455 0 9438 3 0 3 3 0 8 0
filepl 152 35107 0 35004 6 1 5 6 0 8 1
lockfpl 104 1192 0 1191 1 0 1 1 0 8 0
lockfspl 48 477 0 476 1 0 1 1 0 8 0
sessionpl 120 26 0 15 1 0 1 1 0 8 0
pgrppl 48 37 0 26 1 0 1 1 0 8 0
ucredpl 96 4921 0 4909 1 0 1 1 0 8 0
zombiepl 144 9438 0 9438 2 1 1 1 0 8 1
processpl 1008 9471 0 9438 5 0 5 5 0 8 0
procpl 632 21632 0 21591 4 0 4 4 0 8 0
sosppl 144 86 0 86 11 10 1 1 0 8 1
sockpl 400 6472 0 6426 18 12 6 7 0 8 0
mcl64k 65536 269 0 0 34 16 18 34 0 8 0
mcl16k 16384 5 0 0 1 0 1 1 0 8 0
mcl12k 12288 17 0 0 2 0 2 2 0 8 0
mcl9k 9216 15 0 0 2 0 2 2 0 8 0
mcl8k 8192 34 0 0 5 3 2 3 0 8 0
mcl4k 4096 18 0 0 3 0 3 3 0 8 0
mcl2k2 2112 6 0 0 1 0 1 1 0 8 0
mcl2k 2048 331 0 0 16 0 16 16 0 8 0
mtagpl 96 447 0 0 11 0 11 11 0 8 0
mbufpl 256 1153 0 0 64 0 64 64 0 8 0
bufpl 280 19821 0 13548 449 0 449 449 0 8 0
anonpl 16 833271 0 819886 132 74 58 65 0 124 3
amapchunkpl 152 44563 0 44262 49 32 17 25 0 158 4
amappl16 192 31930 0 31387 89 60 29 36 0 8 1
amappl15 184 2312 0 2310 1 0 1 1 0 8 0
amappl14 176 338 0 333 1 0 1 1 0 8 0
amappl13 168 315 0 313 1 0 1 1 0 8 0
amappl12 160 2104 0 2097 1 0 1 1 0 8 0
amappl11 152 3830 0 3815 1 0 1 1 0 8 0
amappl10 144 247 0 239 1 0 1 1 0 8 0
amappl9 136 644 0 643 2 1 1 1 0 8 0
amappl8 128 785 0 647 7 2 5 5 0 8 0
amappl7 120 560 0 548 1 0 1 1 0 8 0
amappl6 112 3905 0 3884 1 0 1 1 0 8 0
amappl5 104 7901 0 7889 1 0 1 1 0 8 0
amappl4 96 4358 0 4323 1 0 1 1 0 8 0
amappl3 88 589 0 584 1 0 1 1 0 8 0
amappl2 80 68116 0 68036 3 1 2 3 0 8 0
amappl1 72 262497 0 262027 23 13 10 19 0 8 0
amappl 80 22128 0 22035 3 0 3 3 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 64 128 0 0 3 0 3 3 0 8 0
uaddrrnd 24 9495 0 9447 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 9495 0 9447 1 0 1 1 0 8 0
vmmpekpl 168 39784 0 39734 4 1 3 3 0 8 0
vmmpepl 168 1168188 0 1166226 165 65 100 102 0 357 11
vmsppl 368 9494 0 9447 6 1 5 5 0 8 0
pdppl 4096 18997 0 18926 12 2 10 10 0 8 1
pvpl 32 3504382 0 3490804 304 177 127 139 0 265 17
pmappl 232 9494 0 9447 4 1 3 3 0 8 0
extentpl 40 53 0 36 1 0 1 1 0 8 0
phpool 112 387 0 54 10 0 10 10 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(ffffffff823c0150) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242f13f,ffffffff82414f7c,98e,ffffffff823b3d8d) at __assert+0x2b sys/kern/subr_prf.c:162
witness_checkorder(ffffffff8277f738,9,0) at witness_checkorder+0x1112 find_instance sys/kern/subr_witness.c:1840 [inline]
witness_checkorder(ffffffff8277f738,9,0) at witness_checkorder+0x1112 sys/kern/subr_witness.c:837
mtx_enter(ffffffff8277f728) at mtx_enter+0x3a sys/kern/kern_lock.c:265
vm_map_lock_ln(ffffffff8277f6f0,ffffffff823e4471,135) at vm_map_lock_ln+0x118 sys/uvm/uvm_map.c:5461
malloc(e10,27,9) at malloc+0x739 sys/kern/kern_malloc.c:310
fdcopy(ffff800020ecebd8) at fdcopy+0x207 sys/kern/kern_descrip.c:1138
process_new(ffff800020ea78c8,ffff800020ecebd8,1) at process_new+0x12c sys/kern/kern_fork.c:253
fork1(ffff800020ea6c70,1,ffffffff813ce540,0,ffff800024176e80,0) at fork1+0x313 sys/kern/kern_fork.c:377
syscall(ffff800024176f00) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800024176f00) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:568
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffda4c0, count: -12
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(ffffffff828a2480) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff828a2480) at __mp_lock+0x129 sys/kern/kern_lock.c:147
syscall(ffff800022b02250) at syscall+0x3fd mi_syscall sys/sys/syscall_mi.h:93 [inline]
syscall(ffff800022b02250) at syscall+0x3fd sys/arch/amd64/amd64/trap.c:568
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffe89a0, count: 9
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(ffffffff828a2480) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff828a2480) at __mp_lock+0x129 sys/kern/kern_lock.c:147
syscall(ffff800022b02250) at syscall+0x3fd mi_syscall sys/sys/syscall_mi.h:93 [inline]
syscall(ffff800022b02250) at syscall+0x3fd sys/arch/amd64/amd64/trap.c:568
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffe89a0, count: -6
---
This report is generated by a bot. It may contain errors.
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syzbot
Dec 19, 2020, 8:47:08 AM12/19/20
to syzkaller-o...@googlegroups.com
Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.
Crashes did not happen for a while, no reproducer and no activity.
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