panic: acquiring blockable sleep lock with spinlock or critical section held (kernel_lock) &kernel_lock
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syzbot
Aug 22, 2019, 8:47:07 PM8/22/19
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: d4b29719 sync
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=12ff61ac600000
kernel config: https://syzkaller.appspot.com/x/.config?x=26ca0a9c07f16a3a
dashboard link: https://syzkaller.appspot.com/bug?extid=446370c91e01c748f96e
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+446370...@syzkaller.appspotmail.com
login: panic: acquiring blockable sleep lock with spinlock or critical
section held (kernel_lock) &kernel_lock
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
* 38826 85838 0 0 0x4000000 1 syz-executor.0
214400 22060 0 0x14000 0x40000200 0 softclock
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic() at panic+0x15c sys/kern/subr_prf.c:207
witness_checkorder(ffffffff826445e0,9,0) at witness_checkorder+0x10cc
sys/kern/subr_witness.c:820
__mp_lock(ffffffff826443d8) at __mp_lock+0xa1
pageflttrap() at pageflttrap+0x6f sys/arch/amd64/amd64/trap.c:162
kerntrap(ffff800022b885a0) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:287
alltraps_kern_meltdown(6,0,600,0,fffffd8007df3854,fffffd80621f1ec0) at
alltraps_kern_meltdown+0x7b
frag6_input(ffff800022b88908,ffff800022b88914,2c,18) at frag6_input+0x7d2
sys/netinet6/frag6.c:321
ip_deliver(ffff800022b88908,ffff800022b88914,2c,18) at ip_deliver+0x353
sys/netinet/ip_input.c:665
ip6_input_if(ffff800022b88908,ffff800022b88914,29,0,ffff80000066d000) at
ip6_input_if+0x17d4 ip6_ours sys/netinet6/ip6_input.c:518 [inline]
ip6_input_if(ffff800022b88908,ffff800022b88914,29,0,ffff80000066d000) at
ip6_input_if+0x17d4 sys/netinet6/ip6_input.c:340
ipv6_input(ffff80000066d000,fffffd806806ab00) at ipv6_input+0x48
sys/netinet6/ip6_input.c:171
if_input_local(ffff80000066d000,fffffd806806ab00,18) at
if_input_local+0x121 sys/net/if.c:783
ip6_output(fffffd807196aa00,ffff800000a8a380,fffffd806f6bbc78,0,0,fffffd806f6bbc08)
at
ip6_output+0xd59
rip6_output(fffffd807196aa00,fffffd807cae8380,ffff800022b88c78,0) at
rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481
end trace frame: 0xffff800022b88d10, count: 0
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{1}>
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
acquiring blockable sleep lock with spinlock or critical section held
(kernel_lock) &kernel_lock
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic() at panic+0x15c sys/kern/subr_prf.c:207
witness_checkorder(ffffffff826445e0,9,0) at witness_checkorder+0x10cc
sys/kern/subr_witness.c:820
__mp_lock(ffffffff826443d8) at __mp_lock+0xa1
pageflttrap() at pageflttrap+0x6f sys/arch/amd64/amd64/trap.c:162
kerntrap(ffff800022b885a0) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:287
alltraps_kern_meltdown(6,0,600,0,fffffd8007df3854,fffffd80621f1ec0) at
alltraps_kern_meltdown+0x7b
frag6_input(ffff800022b88908,ffff800022b88914,2c,18) at frag6_input+0x7d2
sys/netinet6/frag6.c:321
ip_deliver(ffff800022b88908,ffff800022b88914,2c,18) at ip_deliver+0x353
sys/netinet/ip_input.c:665
ip6_input_if(ffff800022b88908,ffff800022b88914,29,0,ffff80000066d000) at
ip6_input_if+0x17d4 ip6_ours sys/netinet6/ip6_input.c:518 [inline]
ip6_input_if(ffff800022b88908,ffff800022b88914,29,0,ffff80000066d000) at
ip6_input_if+0x17d4 sys/netinet6/ip6_input.c:340
ipv6_input(ffff80000066d000,fffffd806806ab00) at ipv6_input+0x48
sys/netinet6/ip6_input.c:171
if_input_local(ffff80000066d000,fffffd806806ab00,18) at
if_input_local+0x121 sys/net/if.c:783
ip6_output(fffffd807196aa00,ffff800000a8a380,fffffd806f6bbc78,0,0,fffffd806f6bbc08)
at
ip6_output+0xd59
rip6_output(fffffd807196aa00,fffffd807cae8380,ffff800022b88c78,0) at
rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481
rip6_usrreq(fffffd807cae8380,9,fffffd807196aa00,0,0,ffff800020a5ec60) at
rip6_usrreq+0x5cd sys/netinet6/raw_ip6.c:670
sosend(fffffd807cae8380,0,ffff800022b88ea8,0,0,0) at sosend+0x668
sys/kern/uipc_socket.c:524
dofilewritev(ffff800020a5ec60,3,ffff800022b88ea8,0,ffff800022b88fb0) at
dofilewritev+0x1ac sys/kern/sys_generic.c:364
sys_write(ffff800020a5ec60,ffff800022b88f48,ffff800022b88fb0) at
sys_write+0x83 sys/kern/sys_generic.c:284
syscall(ffff800022b89020) at syscall+0x552 mi_syscall
sys/sys/syscall_mi.h:92 [inline]
syscall(ffff800022b89020) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555
Xsyscall(0,0,c,0,3,e105bc4f010) at Xsyscall+0x128
end of kernel
end trace frame: 0xe1277ce7340, count: -20
ddb{1}> show registers
rdi 0xffffffff8195cff7 db_enter+0x17
rsi 0x3952 __ALIGN_SIZE+0x2952
rbp 0xffff800022b88300
rbx 0xffff800022b883b0
rdx 0x3953 __ALIGN_SIZE+0x2953
rcx 0xffff800022d8e000
rax 0xffff800022d8e000
r8 0xffffffff814c44b3 kprintf+0x173
r9 0x1
r10 0x25
r11 0x34d3910bb9c8a92f
r12 0x3000000008
r13 0xffff800022b88310
r14 0x100
r15 0x1
rip 0xffffffff8195cff8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800022b882f0
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.0) pid=38826 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=85, usrpri=85, nice=20
forw=0xffffffffffffffff, list=0xffff800020a5fb30,0xffff800020ac0020
process=0xffff800020adca80 user=0xffff800022b84000,
vmspace=0xfffffd807f00c450
estcpu=35, cpticks=2, pctcpu=0.0
user=0, sys=2, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
71001 46832 23807 0 2 0 syz-executor.1
85838 25628 77478 0 2 0 syz-executor.0
*85838 38826 77478 0 7 0x4000000 syz-executor.0
77478 269251 65793 0 3 0x82 nanosleep syz-executor.0
23807 393837 65793 0 3 0x82 nanosleep syz-executor.1
40502 509341 1 0 3 0x100083 ttyin getty
76903 439624 0 0 3 0x14200 bored sosplice
65793 502495 78442 0 3 0x82 thrsleep syz-fuzzer
65793 284395 78442 0 3 0x4000082 nanosleep syz-fuzzer
65793 410079 78442 0 3 0x4000082 thrsleep syz-fuzzer
65793 453119 78442 0 3 0x4000082 kqread syz-fuzzer
65793 383981 78442 0 3 0x4000082 thrsleep syz-fuzzer
65793 306473 78442 0 3 0x4000082 nanosleep syz-fuzzer
65793 469693 78442 0 3 0x4000082 thrsleep syz-fuzzer
65793 159824 78442 0 3 0x4000082 thrsleep syz-fuzzer
65793 99287 78442 0 3 0x4000082 thrsleep syz-fuzzer
65793 215338 78442 0 3 0x4000082 thrsleep syz-fuzzer
78442 430526 36837 0 3 0x10008a pause ksh
36837 234411 84816 0 3 0x92 select sshd
84816 351071 1 0 3 0x80 select sshd
48703 100980 74314 74 3 0x100092 bpf pflogd
74314 163922 1 0 3 0x80 netio pflogd
44213 214940 20447 73 3 0x100090 kqread syslogd
20447 59750 1 0 3 0x100082 netio syslogd
88966 304674 1 77 3 0x100090 poll dhclient
24833 435292 1 0 3 0x80 poll dhclient
26421 195938 0 0 3 0x14200 pgzero zerothread
29727 271168 0 0 3 0x14200 aiodoned aiodoned
37676 431174 0 0 3 0x14200 syncer update
28940 445088 0 0 3 0x14200 cleaner cleaner
23855 56081 0 0 3 0x14200 reaper reaper
31278 472624 0 0 3 0x14200 pgdaemon pagedaemon
72259 508196 0 0 3 0x14200 bored crynlk
97978 180586 0 0 3 0x14200 bored crypto
70443 194481 0 0 3 0x40014200 acpi0 acpi0
25343 204223 0 0 3 0x40014200 idle1
41621 182871 0 0 3 0x14200 bored softnet
50360 300994 0 0 3 0x14200 bored systqmp
76703 412067 0 0 3 0x14200 bored systq
22060 214400 0 0 7 0x40014200 softclock
45171 53350 0 0 3 0x40014200 idle0
63612 164484 0 0 3 0x14200 bored smr
1 27071 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
CPU 1:
exclusive mutex
/syzkaller/managers/multicore/kernel/sys/netinet6/frag6.c:57 r = 0
(0xffffffff8249ae90)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 frag6_input+0x237 sys/netinet6/frag6.c:183
#4 ip_deliver+0x353 sys/netinet/ip_input.c:665
#5 ip6_input_if+0x17d4 ip6_ours sys/netinet6/ip6_input.c:518 [inline]
#5 ip6_input_if+0x17d4 sys/netinet6/ip6_input.c:340
#6 ipv6_input+0x48 sys/netinet6/ip6_input.c:171
#7 if_input_local+0x121 sys/net/if.c:783
#8 ip6_output+0xd59
#9 rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481
#10 rip6_usrreq+0x5cd sys/netinet6/raw_ip6.c:670
#11 sosend+0x668 sys/kern/uipc_socket.c:524
#12 dofilewritev+0x1ac sys/kern/sys_generic.c:364
#13 sys_write+0x83 sys/kern/sys_generic.c:284
#14 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#14 syscall+0x552 sys/arch/amd64/amd64/trap.c:555
#15 Xsyscall+0x128
Process 85838 (syz-executor.0) thread 0xffff800020a5ec60 (38826)
exclusive rwlock netlock r = 0 (0xffffffff824b59f8)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 solock+0x5a sys/kern/uipc_socket2.c:282
#2 sosend+0x52c sys/kern/uipc_socket.c:512
#3 dofilewritev+0x1ac sys/kern/sys_generic.c:364
#4 sys_write+0x83 sys/kern/sys_generic.c:284
#5 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#5 syscall+0x552 sys/arch/amd64/amd64/trap.c:555
#6 Xsyscall+0x128
exclusive mutex
/syzkaller/managers/multicore/kernel/sys/netinet6/frag6.c:57 r = 0
(0xffffffff8249ae90)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 frag6_input+0x237 sys/netinet6/frag6.c:183
#4 ip_deliver+0x353 sys/netinet/ip_input.c:665
#5 ip6_input_if+0x17d4 ip6_ours sys/netinet6/ip6_input.c:518 [inline]
#5 ip6_input_if+0x17d4 sys/netinet6/ip6_input.c:340
#6 ipv6_input+0x48 sys/netinet6/ip6_input.c:171
#7 if_input_local+0x121 sys/net/if.c:783
#8 ip6_output+0xd59
#9 rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481
#10 rip6_usrreq+0x5cd sys/netinet6/raw_ip6.c:670
#11 sosend+0x668 sys/kern/uipc_socket.c:524
#12 dofilewritev+0x1ac sys/kern/sys_generic.c:364
#13 sys_write+0x83 sys/kern/sys_generic.c:284
#14 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#14 syscall+0x552 sys/arch/amd64/amd64/trap.c:555
#15 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim
devbuf 9656 6485K 14856K 78643K 54062 0 0
pcb 14 8K 8K 78643K 1801 0 0
rtable 119 13K 13K 78643K 6125 0 0
ifaddr 100 29K 36K 78643K 2120 0 0
counters 39 33K 33K 78643K 39 0 0
ioctlops 0 0K 4K 78643K 2354 0 0
iov 0 0K 32K 78643K 1655 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1195 75K 77K 78643K 17102 0 0
UFS quota 1 32K 32K 78643K 1 0 0
UFS mount 5 36K 36K 78643K 5 0 0
shm 2 1K 9K 78643K 225 0 0
VM map 2 1K 1K 78643K 2 0 0
sem 12 1K 1K 78643K 1891 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1808 196K 290K 78643K 12765 0 0
file desc 6 17K 25K 78643K 17480 0 0
sigio 0 0K 0K 78643K 209 0 0
proc 55 51K 83K 78643K 4530 0 0
subproc 32 2K 2K 78643K 1134 0 0
NFS srvsock 1 0K 0K 78643K 1 0 0
NFS daemon 1 16K 16K 78643K 1 0 0
ip_moptions 0 0K 0K 78643K 1417 0 0
in_multi 33 2K 2K 78643K 1232 0 0
ether_multi 1 0K 0K 78643K 66 0 0
mrt 2 0K 0K 78643K 43 0 0
ISOFS mount 1 32K 32K 78643K 1 0 0
MSDOSFS mount 1 16K 16K 78643K 1 0 0
ttys 162 715K 715K 78643K 162 0 0
exec 0 0K 1K 78643K 2314 0 0
pfkey data 0 0K 4K 78643K 16 0 0
pagedep 1 8K 8K 78643K 1 0 0
inodedep 1 32K 32K 78643K 1 0 0
newblk 1 0K 0K 78643K 1 0 0
VM swap 7 26K 26K 78643K 7 0 0
UVM amap 137 24K 34K 78643K 57548 0 0
UVM aobj 130 4K 4K 78643K 143 0 0
memdesc 1 4K 4K 78643K 1 0 0
crypto data 1 1K 1K 78643K 1 0 0
ip6_options 2 0K 1K 78643K 1881 0 0
NDP 25 0K 1K 78643K 660 0 0
temp 263 3557K 4197K 78643K 251049 0 0
kqueue 0 0K 0K 78643K 151 0 0
SYN cache 2 16K 16K 78643K 2 0 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg
Idle
arp 64 139 0 133 1 0 1 1 0
8 0
plcache 128 20 0 0 1 0 1 1 0
8 0
rtpcb 80 804 0 802 1 0 1 1 0
8 0
rtentry 112 778 0 734 5 3 2 2 0
8 0
unpcb 120 5381 0 5371 1 0 1 1 0
8 0
syncache 264 4 0 4 1 1 0 1 0
8 0
tcpqe 32 8642 0 8642 1 1 0 1 0
8 0
tcpcb 544 3279 0 3274 1 0 1 1 0
8 0
inpcb 280 9461 0 9448 16 14 2 2 0
8 1
rttmr 72 4 0 4 4 4 0 1 0
8 0
ip6q 72 3 0 2 3 2 1 1 0
8 0
ip6af 48 3 0 2 2 1 1 1 0
8 0
nd6 48 198 0 192 1 0 1 1 0
8 0
pkpcb 40 112 0 112 34 34 0 1 0
8 0
swfcl 56 2 0 0 1 0 1 1 0
8 0
ppxss 1128 349 0 349 47 46 1 1 0
8 1
pffrag 232 39 0 39 17 17 0 1 0
482 0
pffrnode 88 39 0 39 17 17 0 1 0
8 0
pffrent 40 99 0 99 21 21 0 1 0
8 0
pfosfp 40 846 0 846 5 5 0 5 0
8 0
pfosfpen 112 1428 0 1428 21 21 0 21 0
8 0
pfstitem 24 488 0 479 1 0 1 1 0
8 0
pfstkey 112 489 0 480 3 1 2 2 0
8 0
pfstate 328 489 0 480 9 6 3 4 0
8 2
pfrule 1360 21 0 16 2 1 1 2 0
8 0
art_heap8 4096 1 0 0 1 0 1 1 0
8 0
art_heap4 256 3216 0 3019 30 17 13 14 0
8 0
art_table 32 3217 0 3019 2 0 2 2 0
8 0
art_node 16 757 0 717 1 0 1 1 0
8 0
sysvmsgpl 40 36 0 28 1 0 1 1 0
8 0
semupl 112 3 0 3 1 1 0 1 0
8 0
semapl 112 1887 0 1877 1 0 1 1 0
8 0
shmpl 112 141 0 13 4 0 4 4 0
8 0
dirhash 1024 17 0 0 3 0 3 3 0
8 0
dino1pl 128 28117 0 26651 48 0 48 48 0
8 0
ffsino 272 28117 0 26651 100 1 99 99 0
8 0
nchpl 144 52302 0 50675 62 0 62 62 0
8 0
uvmvnodes 72 7354 0 0 134 0 134 134 0
8 0
vnodes 200 7354 0 0 388 0 388 388 0
8 0
namei 1024 172913 0 172913 5 4 1 1 0
8 1
percpumem 16 30 0 0 1 0 1 1 0
8 0
scsiplug 64 31 0 31 23 22 1 1 0
8 1
scxspl 192 151571 0 151571 54 53 1 6 0
8 1
plimitpl 152 1734 0 1726 1 0 1 1 0
8 0
sigapl 432 17500 0 17484 5 3 2 3 0
8 0
futexpl 56 219220 0 219220 5 4 1 1 0
8 1
knotepl 112 3942 0 3923 1 0 1 1 0
8 0
kqueuepl 104 3500 0 3498 1 0 1 1 0
8 0
pipepl 112 9836 0 9817 19 18 1 2 0
8 0
fdescpl 488 17501 0 17484 3 0 3 3 0
8 0
filepl 152 103095 0 102995 24 19 5 7 0
8 1
lockfpl 104 5427 0 5427 7 6 1 1 0
8 1
lockfspl 48 1883 0 1883 7 6 1 1 0
8 1
sessionpl 112 94 0 83 1 0 1 1 0
8 0
pgrppl 48 291 0 280 1 0 1 1 0
8 0
ucredpl 96 19230 0 19220 1 0 1 1 0
8 0
zombiepl 144 17485 0 17485 5 4 1 1 0
8 1
processpl 896 17518 0 17485 6 2 4 5 0
8 0
procpl 632 53482 0 53439 13 8 5 5 0
8 1
srpgc 64 132 0 132 54 53 1 1 0
8 1
sosppl 128 215 0 215 52 51 1 1 0
8 1
sockpl 384 15932 0 15912 17 14 3 4 0
8 0
mcl64k 65536 1087 0 0 129 74 55 64 0
8 1
mcl16k 16384 28 0 0 4 2 2 3 0
8 0
mcl12k 12288 73 0 0 2 0 2 2 0
8 0
mcl9k 9216 49 0 0 2 1 1 2 0
8 0
mcl8k 8192 25 0 0 4 1 3 3 0
8 0
mcl4k 4096 33 0 0 4 1 3 3 0
8 0
mcl2k2 2112 13 0 0 1 0 1 1 0
8 0
mcl2k 2048 241 0 0 24 13 11 24 0
8 0
mtagpl 80 108 0 0 1 0 1 1 0
8 0
mbufpl 256 1598 0 0 43 6 37 37 0
8 0
bufpl 256 46883 0 39528 460 0 460 460 0
8 0
anonpl 16 1648237 0 1637283 335 273 62 70 0
124 0
amapchunkpl 152 107151 0 107018 102 95 7 20 0
158 0
amappl16 192 88431 0 87744 484 440 44 49 0
8 8
amappl15 184 4200 0 4199 8 7 1 1 0
8 0
amappl14 176 4314 0 4307 1 0 1 1 0
8 0
amappl13 168 2920 0 2918 10 9 1 1 0
8 0
amappl12 160 1501 0 1501 7 7 0 1 0
8 0
amappl11 152 1440 0 1425 1 0 1 1 0
8 0
amappl10 144 2062 0 2057 1 0 1 1 0
8 0
amappl9 136 4149 0 4146 1 0 1 1 0
8 0
amappl8 128 3594 0 3549 2 0 2 2 0
8 0
amappl7 120 2135 0 2125 1 0 1 1 0
8 0
amappl6 112 1291 0 1282 1 0 1 1 0
8 0
amappl5 104 2156 0 2141 1 0 1 1 0
8 0
amappl4 96 17395 0 17358 2 1 1 2 0
8 0
amappl3 88 3929 0 3919 1 0 1 1 0
8 0
amappl2 80 138662 0 138585 3 1 2 3 0
8 0
amappl1 72 386570 0 386138 26 16 10 20 0
8 0
amappl 80 54885 0 54839 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
dma64 64 259 0 259 1 1 0 1 0
8 0
dma32 32 7 0 7 1 1 0 1 0
8 0
dma16 16 17 0 17 1 1 0 1 0
8 0
aobjpl 64 142 0 13 3 0 3 3 0
8 0
uaddrrnd 24 17501 0 17484 1 0 1 1 0
8 0
uaddrbest 32 2 0 0 1 0 1 1 0
8 0
uaddr 24 17501 0 17484 1 0 1 1 0
8 0
vmmpekpl 168 139581 0 139550 2 0 2 2 0
8 0
vmmpepl 168 2131162 0 2129249 723 616 107 110 0 357
16
vmsppl 368 17500 0 17484 2 0 2 2 0
8 0
pdppl 4096 35009 0 34968 7 1 6 6 0
8 0
pvpl 32 4240521 0 4226331 775 626 149 171 0
265 5
pmappl 232 17500 0 17484 4 3 1 2 0
8 0
extentpl 40 41 0 26 1 0 1 1 0
8 0
phpool 112 821 0 123 21 0 21 21 0
8 0
---
This bug is generated by a bot. It may contain errors.
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syzbot found the following crash on:
HEAD commit: d4b29719 sync
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=12ff61ac600000
kernel config: https://syzkaller.appspot.com/x/.config?x=26ca0a9c07f16a3a
dashboard link: https://syzkaller.appspot.com/bug?extid=446370c91e01c748f96e
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+446370...@syzkaller.appspotmail.com
login: panic: acquiring blockable sleep lock with spinlock or critical
section held (kernel_lock) &kernel_lock
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
* 38826 85838 0 0 0x4000000 1 syz-executor.0
214400 22060 0 0x14000 0x40000200 0 softclock
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic() at panic+0x15c sys/kern/subr_prf.c:207
witness_checkorder(ffffffff826445e0,9,0) at witness_checkorder+0x10cc
sys/kern/subr_witness.c:820
__mp_lock(ffffffff826443d8) at __mp_lock+0xa1
pageflttrap() at pageflttrap+0x6f sys/arch/amd64/amd64/trap.c:162
kerntrap(ffff800022b885a0) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:287
alltraps_kern_meltdown(6,0,600,0,fffffd8007df3854,fffffd80621f1ec0) at
alltraps_kern_meltdown+0x7b
frag6_input(ffff800022b88908,ffff800022b88914,2c,18) at frag6_input+0x7d2
sys/netinet6/frag6.c:321
ip_deliver(ffff800022b88908,ffff800022b88914,2c,18) at ip_deliver+0x353
sys/netinet/ip_input.c:665
ip6_input_if(ffff800022b88908,ffff800022b88914,29,0,ffff80000066d000) at
ip6_input_if+0x17d4 ip6_ours sys/netinet6/ip6_input.c:518 [inline]
ip6_input_if(ffff800022b88908,ffff800022b88914,29,0,ffff80000066d000) at
ip6_input_if+0x17d4 sys/netinet6/ip6_input.c:340
ipv6_input(ffff80000066d000,fffffd806806ab00) at ipv6_input+0x48
sys/netinet6/ip6_input.c:171
if_input_local(ffff80000066d000,fffffd806806ab00,18) at
if_input_local+0x121 sys/net/if.c:783
ip6_output(fffffd807196aa00,ffff800000a8a380,fffffd806f6bbc78,0,0,fffffd806f6bbc08)
at
ip6_output+0xd59
rip6_output(fffffd807196aa00,fffffd807cae8380,ffff800022b88c78,0) at
rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481
end trace frame: 0xffff800022b88d10, count: 0
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{1}>
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
acquiring blockable sleep lock with spinlock or critical section held
(kernel_lock) &kernel_lock
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic() at panic+0x15c sys/kern/subr_prf.c:207
witness_checkorder(ffffffff826445e0,9,0) at witness_checkorder+0x10cc
sys/kern/subr_witness.c:820
__mp_lock(ffffffff826443d8) at __mp_lock+0xa1
pageflttrap() at pageflttrap+0x6f sys/arch/amd64/amd64/trap.c:162
kerntrap(ffff800022b885a0) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:287
alltraps_kern_meltdown(6,0,600,0,fffffd8007df3854,fffffd80621f1ec0) at
alltraps_kern_meltdown+0x7b
frag6_input(ffff800022b88908,ffff800022b88914,2c,18) at frag6_input+0x7d2
sys/netinet6/frag6.c:321
ip_deliver(ffff800022b88908,ffff800022b88914,2c,18) at ip_deliver+0x353
sys/netinet/ip_input.c:665
ip6_input_if(ffff800022b88908,ffff800022b88914,29,0,ffff80000066d000) at
ip6_input_if+0x17d4 ip6_ours sys/netinet6/ip6_input.c:518 [inline]
ip6_input_if(ffff800022b88908,ffff800022b88914,29,0,ffff80000066d000) at
ip6_input_if+0x17d4 sys/netinet6/ip6_input.c:340
ipv6_input(ffff80000066d000,fffffd806806ab00) at ipv6_input+0x48
sys/netinet6/ip6_input.c:171
if_input_local(ffff80000066d000,fffffd806806ab00,18) at
if_input_local+0x121 sys/net/if.c:783
ip6_output(fffffd807196aa00,ffff800000a8a380,fffffd806f6bbc78,0,0,fffffd806f6bbc08)
at
ip6_output+0xd59
rip6_output(fffffd807196aa00,fffffd807cae8380,ffff800022b88c78,0) at
rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481
rip6_usrreq(fffffd807cae8380,9,fffffd807196aa00,0,0,ffff800020a5ec60) at
rip6_usrreq+0x5cd sys/netinet6/raw_ip6.c:670
sosend(fffffd807cae8380,0,ffff800022b88ea8,0,0,0) at sosend+0x668
sys/kern/uipc_socket.c:524
dofilewritev(ffff800020a5ec60,3,ffff800022b88ea8,0,ffff800022b88fb0) at
dofilewritev+0x1ac sys/kern/sys_generic.c:364
sys_write(ffff800020a5ec60,ffff800022b88f48,ffff800022b88fb0) at
sys_write+0x83 sys/kern/sys_generic.c:284
syscall(ffff800022b89020) at syscall+0x552 mi_syscall
sys/sys/syscall_mi.h:92 [inline]
syscall(ffff800022b89020) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555
Xsyscall(0,0,c,0,3,e105bc4f010) at Xsyscall+0x128
end of kernel
end trace frame: 0xe1277ce7340, count: -20
ddb{1}> show registers
rdi 0xffffffff8195cff7 db_enter+0x17
rsi 0x3952 __ALIGN_SIZE+0x2952
rbp 0xffff800022b88300
rbx 0xffff800022b883b0
rdx 0x3953 __ALIGN_SIZE+0x2953
rcx 0xffff800022d8e000
rax 0xffff800022d8e000
r8 0xffffffff814c44b3 kprintf+0x173
r9 0x1
r10 0x25
r11 0x34d3910bb9c8a92f
r12 0x3000000008
r13 0xffff800022b88310
r14 0x100
r15 0x1
rip 0xffffffff8195cff8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800022b882f0
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.0) pid=38826 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=85, usrpri=85, nice=20
forw=0xffffffffffffffff, list=0xffff800020a5fb30,0xffff800020ac0020
process=0xffff800020adca80 user=0xffff800022b84000,
vmspace=0xfffffd807f00c450
estcpu=35, cpticks=2, pctcpu=0.0
user=0, sys=2, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
71001 46832 23807 0 2 0 syz-executor.1
85838 25628 77478 0 2 0 syz-executor.0
*85838 38826 77478 0 7 0x4000000 syz-executor.0
77478 269251 65793 0 3 0x82 nanosleep syz-executor.0
23807 393837 65793 0 3 0x82 nanosleep syz-executor.1
40502 509341 1 0 3 0x100083 ttyin getty
76903 439624 0 0 3 0x14200 bored sosplice
65793 502495 78442 0 3 0x82 thrsleep syz-fuzzer
65793 284395 78442 0 3 0x4000082 nanosleep syz-fuzzer
65793 410079 78442 0 3 0x4000082 thrsleep syz-fuzzer
65793 453119 78442 0 3 0x4000082 kqread syz-fuzzer
65793 383981 78442 0 3 0x4000082 thrsleep syz-fuzzer
65793 306473 78442 0 3 0x4000082 nanosleep syz-fuzzer
65793 469693 78442 0 3 0x4000082 thrsleep syz-fuzzer
65793 159824 78442 0 3 0x4000082 thrsleep syz-fuzzer
65793 99287 78442 0 3 0x4000082 thrsleep syz-fuzzer
65793 215338 78442 0 3 0x4000082 thrsleep syz-fuzzer
78442 430526 36837 0 3 0x10008a pause ksh
36837 234411 84816 0 3 0x92 select sshd
84816 351071 1 0 3 0x80 select sshd
48703 100980 74314 74 3 0x100092 bpf pflogd
74314 163922 1 0 3 0x80 netio pflogd
44213 214940 20447 73 3 0x100090 kqread syslogd
20447 59750 1 0 3 0x100082 netio syslogd
88966 304674 1 77 3 0x100090 poll dhclient
24833 435292 1 0 3 0x80 poll dhclient
26421 195938 0 0 3 0x14200 pgzero zerothread
29727 271168 0 0 3 0x14200 aiodoned aiodoned
37676 431174 0 0 3 0x14200 syncer update
28940 445088 0 0 3 0x14200 cleaner cleaner
23855 56081 0 0 3 0x14200 reaper reaper
31278 472624 0 0 3 0x14200 pgdaemon pagedaemon
72259 508196 0 0 3 0x14200 bored crynlk
97978 180586 0 0 3 0x14200 bored crypto
70443 194481 0 0 3 0x40014200 acpi0 acpi0
25343 204223 0 0 3 0x40014200 idle1
41621 182871 0 0 3 0x14200 bored softnet
50360 300994 0 0 3 0x14200 bored systqmp
76703 412067 0 0 3 0x14200 bored systq
22060 214400 0 0 7 0x40014200 softclock
45171 53350 0 0 3 0x40014200 idle0
63612 164484 0 0 3 0x14200 bored smr
1 27071 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
CPU 1:
exclusive mutex
/syzkaller/managers/multicore/kernel/sys/netinet6/frag6.c:57 r = 0
(0xffffffff8249ae90)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 frag6_input+0x237 sys/netinet6/frag6.c:183
#4 ip_deliver+0x353 sys/netinet/ip_input.c:665
#5 ip6_input_if+0x17d4 ip6_ours sys/netinet6/ip6_input.c:518 [inline]
#5 ip6_input_if+0x17d4 sys/netinet6/ip6_input.c:340
#6 ipv6_input+0x48 sys/netinet6/ip6_input.c:171
#7 if_input_local+0x121 sys/net/if.c:783
#8 ip6_output+0xd59
#9 rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481
#10 rip6_usrreq+0x5cd sys/netinet6/raw_ip6.c:670
#11 sosend+0x668 sys/kern/uipc_socket.c:524
#12 dofilewritev+0x1ac sys/kern/sys_generic.c:364
#13 sys_write+0x83 sys/kern/sys_generic.c:284
#14 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#14 syscall+0x552 sys/arch/amd64/amd64/trap.c:555
#15 Xsyscall+0x128
Process 85838 (syz-executor.0) thread 0xffff800020a5ec60 (38826)
exclusive rwlock netlock r = 0 (0xffffffff824b59f8)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 solock+0x5a sys/kern/uipc_socket2.c:282
#2 sosend+0x52c sys/kern/uipc_socket.c:512
#3 dofilewritev+0x1ac sys/kern/sys_generic.c:364
#4 sys_write+0x83 sys/kern/sys_generic.c:284
#5 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#5 syscall+0x552 sys/arch/amd64/amd64/trap.c:555
#6 Xsyscall+0x128
exclusive mutex
/syzkaller/managers/multicore/kernel/sys/netinet6/frag6.c:57 r = 0
(0xffffffff8249ae90)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 frag6_input+0x237 sys/netinet6/frag6.c:183
#4 ip_deliver+0x353 sys/netinet/ip_input.c:665
#5 ip6_input_if+0x17d4 ip6_ours sys/netinet6/ip6_input.c:518 [inline]
#5 ip6_input_if+0x17d4 sys/netinet6/ip6_input.c:340
#6 ipv6_input+0x48 sys/netinet6/ip6_input.c:171
#7 if_input_local+0x121 sys/net/if.c:783
#8 ip6_output+0xd59
#9 rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481
#10 rip6_usrreq+0x5cd sys/netinet6/raw_ip6.c:670
#11 sosend+0x668 sys/kern/uipc_socket.c:524
#12 dofilewritev+0x1ac sys/kern/sys_generic.c:364
#13 sys_write+0x83 sys/kern/sys_generic.c:284
#14 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#14 syscall+0x552 sys/arch/amd64/amd64/trap.c:555
#15 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim
devbuf 9656 6485K 14856K 78643K 54062 0 0
pcb 14 8K 8K 78643K 1801 0 0
rtable 119 13K 13K 78643K 6125 0 0
ifaddr 100 29K 36K 78643K 2120 0 0
counters 39 33K 33K 78643K 39 0 0
ioctlops 0 0K 4K 78643K 2354 0 0
iov 0 0K 32K 78643K 1655 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1195 75K 77K 78643K 17102 0 0
UFS quota 1 32K 32K 78643K 1 0 0
UFS mount 5 36K 36K 78643K 5 0 0
shm 2 1K 9K 78643K 225 0 0
VM map 2 1K 1K 78643K 2 0 0
sem 12 1K 1K 78643K 1891 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1808 196K 290K 78643K 12765 0 0
file desc 6 17K 25K 78643K 17480 0 0
sigio 0 0K 0K 78643K 209 0 0
proc 55 51K 83K 78643K 4530 0 0
subproc 32 2K 2K 78643K 1134 0 0
NFS srvsock 1 0K 0K 78643K 1 0 0
NFS daemon 1 16K 16K 78643K 1 0 0
ip_moptions 0 0K 0K 78643K 1417 0 0
in_multi 33 2K 2K 78643K 1232 0 0
ether_multi 1 0K 0K 78643K 66 0 0
mrt 2 0K 0K 78643K 43 0 0
ISOFS mount 1 32K 32K 78643K 1 0 0
MSDOSFS mount 1 16K 16K 78643K 1 0 0
ttys 162 715K 715K 78643K 162 0 0
exec 0 0K 1K 78643K 2314 0 0
pfkey data 0 0K 4K 78643K 16 0 0
pagedep 1 8K 8K 78643K 1 0 0
inodedep 1 32K 32K 78643K 1 0 0
newblk 1 0K 0K 78643K 1 0 0
VM swap 7 26K 26K 78643K 7 0 0
UVM amap 137 24K 34K 78643K 57548 0 0
UVM aobj 130 4K 4K 78643K 143 0 0
memdesc 1 4K 4K 78643K 1 0 0
crypto data 1 1K 1K 78643K 1 0 0
ip6_options 2 0K 1K 78643K 1881 0 0
NDP 25 0K 1K 78643K 660 0 0
temp 263 3557K 4197K 78643K 251049 0 0
kqueue 0 0K 0K 78643K 151 0 0
SYN cache 2 16K 16K 78643K 2 0 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg
Idle
arp 64 139 0 133 1 0 1 1 0
8 0
plcache 128 20 0 0 1 0 1 1 0
8 0
rtpcb 80 804 0 802 1 0 1 1 0
8 0
rtentry 112 778 0 734 5 3 2 2 0
8 0
unpcb 120 5381 0 5371 1 0 1 1 0
8 0
syncache 264 4 0 4 1 1 0 1 0
8 0
tcpqe 32 8642 0 8642 1 1 0 1 0
8 0
tcpcb 544 3279 0 3274 1 0 1 1 0
8 0
inpcb 280 9461 0 9448 16 14 2 2 0
8 1
rttmr 72 4 0 4 4 4 0 1 0
8 0
ip6q 72 3 0 2 3 2 1 1 0
8 0
ip6af 48 3 0 2 2 1 1 1 0
8 0
nd6 48 198 0 192 1 0 1 1 0
8 0
pkpcb 40 112 0 112 34 34 0 1 0
8 0
swfcl 56 2 0 0 1 0 1 1 0
8 0
ppxss 1128 349 0 349 47 46 1 1 0
8 1
pffrag 232 39 0 39 17 17 0 1 0
482 0
pffrnode 88 39 0 39 17 17 0 1 0
8 0
pffrent 40 99 0 99 21 21 0 1 0
8 0
pfosfp 40 846 0 846 5 5 0 5 0
8 0
pfosfpen 112 1428 0 1428 21 21 0 21 0
8 0
pfstitem 24 488 0 479 1 0 1 1 0
8 0
pfstkey 112 489 0 480 3 1 2 2 0
8 0
pfstate 328 489 0 480 9 6 3 4 0
8 2
pfrule 1360 21 0 16 2 1 1 2 0
8 0
art_heap8 4096 1 0 0 1 0 1 1 0
8 0
art_heap4 256 3216 0 3019 30 17 13 14 0
8 0
art_table 32 3217 0 3019 2 0 2 2 0
8 0
art_node 16 757 0 717 1 0 1 1 0
8 0
sysvmsgpl 40 36 0 28 1 0 1 1 0
8 0
semupl 112 3 0 3 1 1 0 1 0
8 0
semapl 112 1887 0 1877 1 0 1 1 0
8 0
shmpl 112 141 0 13 4 0 4 4 0
8 0
dirhash 1024 17 0 0 3 0 3 3 0
8 0
dino1pl 128 28117 0 26651 48 0 48 48 0
8 0
ffsino 272 28117 0 26651 100 1 99 99 0
8 0
nchpl 144 52302 0 50675 62 0 62 62 0
8 0
uvmvnodes 72 7354 0 0 134 0 134 134 0
8 0
vnodes 200 7354 0 0 388 0 388 388 0
8 0
namei 1024 172913 0 172913 5 4 1 1 0
8 1
percpumem 16 30 0 0 1 0 1 1 0
8 0
scsiplug 64 31 0 31 23 22 1 1 0
8 1
scxspl 192 151571 0 151571 54 53 1 6 0
8 1
plimitpl 152 1734 0 1726 1 0 1 1 0
8 0
sigapl 432 17500 0 17484 5 3 2 3 0
8 0
futexpl 56 219220 0 219220 5 4 1 1 0
8 1
knotepl 112 3942 0 3923 1 0 1 1 0
8 0
kqueuepl 104 3500 0 3498 1 0 1 1 0
8 0
pipepl 112 9836 0 9817 19 18 1 2 0
8 0
fdescpl 488 17501 0 17484 3 0 3 3 0
8 0
filepl 152 103095 0 102995 24 19 5 7 0
8 1
lockfpl 104 5427 0 5427 7 6 1 1 0
8 1
lockfspl 48 1883 0 1883 7 6 1 1 0
8 1
sessionpl 112 94 0 83 1 0 1 1 0
8 0
pgrppl 48 291 0 280 1 0 1 1 0
8 0
ucredpl 96 19230 0 19220 1 0 1 1 0
8 0
zombiepl 144 17485 0 17485 5 4 1 1 0
8 1
processpl 896 17518 0 17485 6 2 4 5 0
8 0
procpl 632 53482 0 53439 13 8 5 5 0
8 1
srpgc 64 132 0 132 54 53 1 1 0
8 1
sosppl 128 215 0 215 52 51 1 1 0
8 1
sockpl 384 15932 0 15912 17 14 3 4 0
8 0
mcl64k 65536 1087 0 0 129 74 55 64 0
8 1
mcl16k 16384 28 0 0 4 2 2 3 0
8 0
mcl12k 12288 73 0 0 2 0 2 2 0
8 0
mcl9k 9216 49 0 0 2 1 1 2 0
8 0
mcl8k 8192 25 0 0 4 1 3 3 0
8 0
mcl4k 4096 33 0 0 4 1 3 3 0
8 0
mcl2k2 2112 13 0 0 1 0 1 1 0
8 0
mcl2k 2048 241 0 0 24 13 11 24 0
8 0
mtagpl 80 108 0 0 1 0 1 1 0
8 0
mbufpl 256 1598 0 0 43 6 37 37 0
8 0
bufpl 256 46883 0 39528 460 0 460 460 0
8 0
anonpl 16 1648237 0 1637283 335 273 62 70 0
124 0
amapchunkpl 152 107151 0 107018 102 95 7 20 0
158 0
amappl16 192 88431 0 87744 484 440 44 49 0
8 8
amappl15 184 4200 0 4199 8 7 1 1 0
8 0
amappl14 176 4314 0 4307 1 0 1 1 0
8 0
amappl13 168 2920 0 2918 10 9 1 1 0
8 0
amappl12 160 1501 0 1501 7 7 0 1 0
8 0
amappl11 152 1440 0 1425 1 0 1 1 0
8 0
amappl10 144 2062 0 2057 1 0 1 1 0
8 0
amappl9 136 4149 0 4146 1 0 1 1 0
8 0
amappl8 128 3594 0 3549 2 0 2 2 0
8 0
amappl7 120 2135 0 2125 1 0 1 1 0
8 0
amappl6 112 1291 0 1282 1 0 1 1 0
8 0
amappl5 104 2156 0 2141 1 0 1 1 0
8 0
amappl4 96 17395 0 17358 2 1 1 2 0
8 0
amappl3 88 3929 0 3919 1 0 1 1 0
8 0
amappl2 80 138662 0 138585 3 1 2 3 0
8 0
amappl1 72 386570 0 386138 26 16 10 20 0
8 0
amappl 80 54885 0 54839 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
dma64 64 259 0 259 1 1 0 1 0
8 0
dma32 32 7 0 7 1 1 0 1 0
8 0
dma16 16 17 0 17 1 1 0 1 0
8 0
aobjpl 64 142 0 13 3 0 3 3 0
8 0
uaddrrnd 24 17501 0 17484 1 0 1 1 0
8 0
uaddrbest 32 2 0 0 1 0 1 1 0
8 0
uaddr 24 17501 0 17484 1 0 1 1 0
8 0
vmmpekpl 168 139581 0 139550 2 0 2 2 0
8 0
vmmpepl 168 2131162 0 2129249 723 616 107 110 0 357
16
vmsppl 368 17500 0 17484 2 0 2 2 0
8 0
pdppl 4096 35009 0 34968 7 1 6 6 0
8 0
pvpl 32 4240521 0 4226331 775 626 149 171 0
265 5
pmappl 232 17500 0 17484 4 3 1 2 0
8 0
extentpl 40 41 0 26 1 0 1 1 0
8 0
phpool 112 821 0 123 21 0 21 21 0
8 0
---
This bug 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.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
Anton Lindqvist
Aug 27, 2019, 3:14:27 AM8/27/19
to syzbot, syzkaller-o...@googlegroups.com
#syz fix: Do not use the flow of the first fragment to store ECN information. Handle the ECN in the fragment queue. Reported-by: syzbot+0aa80b...@syzkaller.appspotmail.com fix from FreeBSD; OK claudio@
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