panic: acquiring blockable sleep lock with spinlock or critical section held (rwlock) kmmaplk (2)

1 view
Skip to first unread message

syzbot

unread,
Sep 8, 2021, 3:53:20 PMSep 8
to syzkaller-o...@googlegroups.com
Hello,

syzbot found the following issue on:

HEAD commit: 413a7a136984 document that SFP modules work in SFP+ cards...
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=14b3cdb3300000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=5d46687b7076bfb8622f

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+5d4668...@syzkaller.appspotmail.com

login: panic: acquiring blockable sleep lock with spinlock or critical section held (rwlock) kmmaplk
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*347058 82952 0 0 0x4000000 0K syz-executor.0
100183 77766 0 0x14000 0x200 1 reaper
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff8246f37b) at panic+0x177 sys/kern/subr_prf.c:202
witness_checkorder(ffffffff829d1190,1,0) at witness_checkorder+0x11eb sys/kern/subr_witness.c:833
rw_enter_read(ffffffff829d1180) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112
uvmfault_lookup(ffff8000222b2b90,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1701
uvm_fault_check(ffff8000222b2b90,ffff8000222b2bc8,ffff8000222b2bf0) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674
uvm_fault(ffffffff829d1178,ffff8000254ad000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:601
kpageflttrap(ffff8000222b2d20,ffff8000254adde8) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264
kerntrap(ffff8000222b2d20) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
memcpy() at memcpy+0x15
timeout_run(ffff8000ffff75d0) at timeout_run+0xd6 timeout_sync_leave sys/kern/kern_timeout.c:207 [inline]
timeout_run(ffff8000ffff75d0) at timeout_run+0xd6 sys/kern/kern_timeout.c:680
softclock_process_tick_timeout(ffff8000ffff75d0,0) at softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:725
softclock(0) at softclock+0x11a sys/kern/kern_timeout.c:756
end trace frame: 0xffff8000222b2f60, 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{0}>
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
*cpu0: acquiring blockable sleep lock with spinlock or critical section held (rwlock) kmmaplk
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff8246f37b) at panic+0x177 sys/kern/subr_prf.c:202
witness_checkorder(ffffffff829d1190,1,0) at witness_checkorder+0x11eb sys/kern/subr_witness.c:833
rw_enter_read(ffffffff829d1180) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112
uvmfault_lookup(ffff8000222b2b90,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1701
uvm_fault_check(ffff8000222b2b90,ffff8000222b2bc8,ffff8000222b2bf0) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674
uvm_fault(ffffffff829d1178,ffff8000254ad000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:601
kpageflttrap(ffff8000222b2d20,ffff8000254adde8) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264
kerntrap(ffff8000222b2d20) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
memcpy() at memcpy+0x15
timeout_run(ffff8000ffff75d0) at timeout_run+0xd6 timeout_sync_leave sys/kern/kern_timeout.c:207 [inline]
timeout_run(ffff8000ffff75d0) at timeout_run+0xd6 sys/kern/kern_timeout.c:680
softclock_process_tick_timeout(ffff8000ffff75d0,0) at softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:725
softclock(0) at softclock+0x11a sys/kern/kern_timeout.c:756
softintr_dispatch(0) at softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90
Xsoftclock() at Xsoftclock+0x1f
pmap_enter(fffffd806e5432a8,53df40cf000,6351c000,3,22) at pmap_enter+0x76f pmap_unmap_ptes sys/arch/amd64/amd64/pmap.c:431 [inline]
pmap_enter(fffffd806e5432a8,53df40cf000,6351c000,3,22) at pmap_enter+0x76f sys/arch/amd64/amd64/pmap.c:2848
uvm_fault_lower(ffff8000222b3290,ffff8000222b32c8,ffff8000222b3210,0) at uvm_fault_lower+0x6dd sys/uvm/uvm_fault.c:1461
uvm_fault(fffffd806f59e178,53df40cf000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638
upageflttrap(ffff8000222b3400,53df40cf000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
usertrap(ffff8000222b3400) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x53d52052b80, count: -22
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff8000222b27f0
rbx 0xffffffff82793bff cpu_info_full_primary+0x2bff
rdx 0x8b
rcx 0x2
rax 0x5e
r8 0xffffffff8147b7f4 kprintf+0x144
r9 0x1
r10 0xcfce46b3494b0588
r11 0xd1fb389a0c8b709e
r12 0xffffffff82793a00 cpu_info_full_primary+0x2a00
r13 0
r14 0
r15 0x1
rip 0xffffffff82177ed8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff8000222b27e0
ss 0
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor.0) pid=347058 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=86, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff8000ffff62b0,0xffffffff82842420
process=0xffff8000ffff8868 user=0xffff8000222ae000, vmspace=0xfffffd806f59e178
estcpu=36, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
82952 431335 8571 0 2 0 syz-executor.0
*82952 347058 8571 0 7 0x4000000 syz-executor.0
79289 464230 71667 0 2 0x482 syz-executor.1
8571 83768 71667 0 3 0x82 nanoslp syz-executor.0
71667 198472 67213 0 3 0x82 thrsleep syz-fuzzer
71667 182057 67213 0 3 0x4000082 thrsleep syz-fuzzer
71667 341570 67213 0 3 0x4000082 thrsleep syz-fuzzer
71667 372407 67213 0 3 0x4000082 thrsleep syz-fuzzer
71667 233652 67213 0 3 0x4000082 thrsleep syz-fuzzer
71667 391362 67213 0 3 0x4000082 thrsleep syz-fuzzer
71667 353855 67213 0 3 0x4000082 thrsleep syz-fuzzer
71667 472785 67213 0 3 0x4000082 kqread syz-fuzzer
67213 157375 7689 0 3 0x10008a sigsusp ksh
7689 71822 79870 0 3 0x9a select sshd
84644 496535 1 0 3 0x100083 ttyin getty
79870 172510 1 0 3 0x88 select sshd
97722 468887 13595 74 3 0x100092 bpf pflogd
13595 387600 1 0 3 0x80 netio pflogd
22110 420922 6472 73 3 0x100090 kqread syslogd
6472 56831 1 0 3 0x100082 netio syslogd
60654 474265 1 0 3 0x100080 kqread resolvd
65577 272389 37282 77 3 0x100092 kqread dhcpleased
62621 173075 37282 77 3 0x100092 kqread dhcpleased
37282 225591 1 0 3 0x80 kqread dhcpleased
17061 89779 0 0 3 0x14200 bored smr
35331 40334 0 0 2 0x14200 zerothread
22854 460380 0 0 3 0x14200 aiodoned aiodoned
20669 231638 0 0 3 0x14200 syncer update
53383 127526 0 0 3 0x14200 cleaner cleaner
77766 100183 0 0 7 0x14200 reaper
15999 241764 0 0 3 0x14200 pgdaemon pagedaemon
67509 44970 0 0 3 0x14200 bored crynlk
55040 497487 0 0 3 0x14200 bored crypto
53830 250356 0 0 3 0x14200 bored viomb
25133 158533 0 0 3 0x40014200 acpi0 acpi0
79187 181502 0 0 3 0x40014200 idle1
21775 433668 0 0 3 0x14200 bored softnet
61220 171250 0 0 3 0x14200 bored systqmp
66910 331592 0 0 3 0x14200 bored systq
85920 81882 0 0 3 0x40014200 bored softclock
23705 31463 0 0 3 0x40014200 idle0
1 305225 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:125 r = 0 (0xffffffff827e37b8)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 mtx_enter_try+0x100
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 kcov_remote_leave+0x1f sys/dev/kcov.c:674
#4 timeout_run+0xd6 timeout_sync_leave sys/kern/kern_timeout.c:207 [inline]
#4 timeout_run+0xd6 sys/kern/kern_timeout.c:680
#5 softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:725
#6 softclock+0x11a sys/kern/kern_timeout.c:756
#7 softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90
#8 Xsoftclock+0x1f
#9 pmap_enter+0x76f pmap_unmap_ptes sys/arch/amd64/amd64/pmap.c:431 [inline]
#9 pmap_enter+0x76f sys/arch/amd64/amd64/pmap.c:2848
#10 uvm_fault_lower+0x6dd sys/uvm/uvm_fault.c:1461
#11 uvm_fault+0x240 sys/uvm/uvm_fault.c:638
#12 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
#13 usertrap+0x214 sys/arch/amd64/amd64/trap.c:403
#14 recall_trap+0x8
shared mutex timeout r = 0 (0xffffffff827e35b0)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 timeout_run+0xb7 sys/kern/kern_timeout.c:674
#2 softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:725
#3 softclock+0x11a sys/kern/kern_timeout.c:756
#4 softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90
#5 Xsoftclock+0x1f
#6 pmap_enter+0x76f pmap_unmap_ptes sys/arch/amd64/amd64/pmap.c:431 [inline]
#6 pmap_enter+0x76f sys/arch/amd64/amd64/pmap.c:2848
#7 uvm_fault_lower+0x6dd sys/uvm/uvm_fault.c:1461
#8 uvm_fault+0x240 sys/uvm/uvm_fault.c:638
#9 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
#10 usertrap+0x214 sys/arch/amd64/amd64/trap.c:403
#11 recall_trap+0x8
CPU 1:
exclusive mutex pvpl r = 0 (0xffffffff8298f650)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 mtx_enter_try+0x100
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 pool_put+0x8a sys/kern/subr_pool.c:799
#4 pmap_do_remove+0x606 sys/arch/amd64/amd64/pmap.c:1872
#5 uvm_map_teardown+0x195 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline]
#5 uvm_map_teardown+0x195 sys/uvm/uvm_map.c:2744
#6 uvmspace_free+0xa6 sys/uvm/uvm_map.c:3656
#7 reaper+0x189 sys/kern/kern_exit.c:462
#8 proc_trampoline+0x1c
Process 82952 (syz-executor.0) thread 0xffff8000ffff6fd0 (347058)
exclusive kernel_lock &kernel_lock r = 1 (0xffffffff828dad40)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 uvm_fault+0x224 sys/uvm/uvm_fault.c:637
#2 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
#3 usertrap+0x214 sys/arch/amd64/amd64/trap.c:403
#4 recall_trap+0x8
exclusive rwlock amaplk r = 0 (0xfffffd8064e97710)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 uvm_fault_check+0x3d2 sys/uvm/uvm_fault.c:774
#2 uvm_fault+0x102 sys/uvm/uvm_fault.c:601
#3 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
#4 usertrap+0x214 sys/arch/amd64/amd64/trap.c:403
#5 recall_trap+0x8
shared rwlock vmmaplk r = 0 (0xfffffd806f59e190)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1701
#2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674
#3 uvm_fault+0x102 sys/uvm/uvm_fault.c:601
#4 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
#5 usertrap+0x214 sys/arch/amd64/amd64/trap.c:403
#6 recall_trap+0x8
exclusive mutex /syzkaller/managers/multicore/kernel/sys/dev/kcov.c:125 r = 0 (0xffffffff827e37b8)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 mtx_enter_try+0x100
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 kcov_remote_leave+0x1f sys/dev/kcov.c:674
#4 timeout_run+0xd6 timeout_sync_leave sys/kern/kern_timeout.c:207 [inline]
#4 timeout_run+0xd6 sys/kern/kern_timeout.c:680
#5 softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:725
#6 softclock+0x11a sys/kern/kern_timeout.c:756
#7 softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90
#8 Xsoftclock+0x1f
#9 pmap_enter+0x76f pmap_unmap_ptes sys/arch/amd64/amd64/pmap.c:431 [inline]
#9 pmap_enter+0x76f sys/arch/amd64/amd64/pmap.c:2848
#10 uvm_fault_lower+0x6dd sys/uvm/uvm_fault.c:1461
#11 uvm_fault+0x240 sys/uvm/uvm_fault.c:638
#12 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
#13 usertrap+0x214 sys/arch/amd64/amd64/trap.c:403
#14 recall_trap+0x8
shared mutex timeout r = 0 (0xffffffff827e35b0)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 timeout_run+0xb7 sys/kern/kern_timeout.c:674
#2 softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:725
#3 softclock+0x11a sys/kern/kern_timeout.c:756
#4 softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90
#5 Xsoftclock+0x1f
#6 pmap_enter+0x76f pmap_unmap_ptes sys/arch/amd64/amd64/pmap.c:431 [inline]
#6 pmap_enter+0x76f sys/arch/amd64/amd64/pmap.c:2848
#7 uvm_fault_lower+0x6dd sys/uvm/uvm_fault.c:1461
#8 uvm_fault+0x240 sys/uvm/uvm_fault.c:638
#9 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
#10 usertrap+0x214 sys/arch/amd64/amd64/trap.c:403
#11 recall_trap+0x8
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10122 6474K 6483K 78643K 11215 0
pcb 13 8K 8K 78643K 13 0
rtable 106 3K 3K 78643K 172 0
ifaddr 44 10K 10K 78643K 45 0
counters 44 34K 34K 78643K 44 0
ioctlops 0 0K 4K 78643K 1481 0
iov 0 0K 0K 78643K 2 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 6 0
vnodes 1220 77K 77K 78643K 1226 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 1K 78643K 2 0
VM map 2 1K 1K 78643K 2 0
sem 2 0K 0K 78643K 2 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12598 0
file desc 5 13K 25K 78643K 44 0
sigio 0 0K 0K 78643K 1 0
proc 67 87K 99K 78643K 334 0
subproc 32 2K 2K 78643K 34 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
in_multi 33 2K 2K 78643K 33 0
ether_multi 1 0K 0K 78643K 1 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 49 228K 228K 78643K 49 0
exec 0 0K 2K 78643K 404 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 322 35K 36K 78643K 2314 0
UVM aobj 3 2K 2K 78643K 3 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
NDP 6 0K 0K 78643K 10 0
temp 66 4199K 4263K 78643K 2374 0
kqueue 10 14K 14K 78643K 10 0
SYN cache 2 16K 16K 78643K 2 0
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 22 0 0 1 0 1 1 0 8 0
rtpcb 120 21 0 18 1 0 1 1 0 8 0
rtentry 112 45 0 1 2 0 2 2 0 8 0
unpcb 120 63 0 48 1 0 1 1 0 8 0
syncache 296 4 0 4 1 1 0 1 0 8 0
tcpqe 32 270 0 270 3 3 0 1 0 8 0
tcpcb 736 10 0 5 1 0 1 1 0 8 0
arp 120 6 0 0 1 0 1 1 0 8 0
inpcb 304 42 0 34 1 0 1 1 0 8 0
nd6 48 6 0 0 1 0 1 1 0 8 0
kcovpl 48 2 0 0 1 0 1 1 0 8 0
pfosfp 40 1428 0 1005 5 0 5 5 0 8 0
pfosfpen 112 1428 0 714 21 0 21 21 0 8 0
pfstitem 24 12 0 2 1 0 1 1 0 8 0
pfstkey 112 12 0 2 1 0 1 1 0 8 0
pfstate 320 12 0 2 1 0 1 1 0 8 0
pfrule 1360 21 0 16 2 1 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 188 0 0 12 0 12 12 0 8 0
art_table 32 189 0 0 2 0 2 2 0 8 0
art_node 16 44 0 4 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1450 0 38 89 0 89 89 0 8 0
ffsino 272 1450 0 38 95 0 95 95 0 8 0
nchpl 144 1687 0 67 61 0 61 61 0 8 0
uvmvnodes 72 1496 0 0 28 0 28 28 0 8 0
vnodes 224 1496 0 0 88 0 88 88 0 8 0
namei 1024 4740 0 4740 2 1 1 1 0 8 1
percpumem 16 34 0 0 1 0 1 1 0 8 0
scxspl 216 5066 0 5066 9 8 1 8 0 8 1
plimitpl 152 17 0 8 1 0 1 1 0 8 0
sigapl 424 294 0 260 5 0 5 5 0 8 0
futexpl 56 138 0 138 1 0 1 1 0 8 1
knotepl 112 50 0 0 2 0 2 2 0 8 0
kqueuepl 216 15 0 9 1 0 1 1 0 8 0
pipepl 336 85 0 75 2 0 2 2 0 8 1
fdescpl 496 278 0 260 3 0 3 3 0 8 0
filepl 152 1319 0 1207 6 0 6 6 0 8 1
lockfpl 104 6 0 4 1 0 1 1 0 8 0
lockfspl 48 4 0 2 1 0 1 1 0 8 0
sessionpl 144 18 0 7 1 0 1 1 0 8 0
pgrppl 48 18 0 7 1 0 1 1 0 8 0
ucredpl 96 78 0 66 1 0 1 1 0 8 0
zombiepl 144 260 0 259 2 1 1 1 0 8 0
processpl 1072 294 0 259 3 0 3 3 0 8 0
procpl 672 318 0 275 4 0 4 4 0 8 0
sockpl 480 126 0 100 5 0 5 5 0 8 1
mcl12k 12288 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 4 0 0 1 0 1 1 0 8 0
mcl4k 4096 3 0 0 1 0 1 1 0 8 0
mcl2k 2048 191 0 0 24 0 24 24 0 8 0
mtagpl 96 3 0 0 1 0 1 1 0 8 0
mbufpl 256 243 0 0 16 0 16 16 0 8 0
bufpl 280 3441 0 134 237 0 237 237 0 8 0
anonpl 24 75325 0 38776 223 2 221 221 0 186 0
amapchunkpl 152 5692 0 4270 60 1 59 59 0 158 1
amappl16 200 1183 0 173 55 0 55 55 0 8 0
amappl14 184 4 0 2 1 0 1 1 0 8 0
amappl13 176 35 0 31 1 0 1 1 0 8 0
amappl12 168 17 0 13 1 0 1 1 0 8 0
amappl11 160 56 0 41 1 0 1 1 0 8 0
amappl10 152 52 0 44 1 0 1 1 0 8 0
amappl9 144 186 0 183 1 0 1 1 0 8 0
amappl8 136 378 0 341 2 0 2 2 0 8 0
amappl7 128 73 0 60 1 0 1 1 0 8 0
amappl6 120 134 0 121 1 0 1 1 0 8 0
amappl5 112 295 0 275 1 0 1 1 0 8 0
amappl4 104 576 0 548 1 0 1 1 0 8 0
amappl3 96 53 0 46 1 0 1 1 0 8 0
amappl2 88 476 0 421 2 0 2 2 0 8 0
amappl1 80 8069 0 7620 15 4 11 13 0 8 1
amappl 88 1989 0 1729 6 0 6 6 0 92 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma1024 1024 1 0 0 1 0 1 1 0 8 0
dma256 256 6 0 6 1 1 0 1 0 8 0
dma128 128 253 0 253 1 1 0 1 0 8 0
dma64 64 6 0 6 1 1 0 1 0 8 0
dma32 32 7 0 7 1 1 0 1 0 8 0
dma16 16 18 0 17 1 0 1 1 0 8 0
aobjpl 64 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 278 0 260 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 278 0 260 1 0 1 1 0 8 0
vmmpekpl 168 6642 0 6612 2 0 2 2 0 8 0
vmmpepl 168 31034 0 28540 156 1 155 155 0 357 45
vmsppl 368 277 0 259 2 0 2 2 0 8 0
rwobjpl 56 9081 0 7211 29 1 28 28 0 8 1
pdppl 4096 564 0 518 74 24 50 50 0 8 4
pvpl 32 200166 0 160456 332 3 329 329 0 265 2
pmappl 224 277 0 259 2 0 2 2 0 8 0
extentpl 40 58 0 40 1 0 1 1 0 8 0
phpool 112 328 0 28 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:440
panic(ffffffff8246f37b) at panic+0x177 sys/kern/subr_prf.c:202
witness_checkorder(ffffffff829d1190,1,0) at witness_checkorder+0x11eb sys/kern/subr_witness.c:833
rw_enter_read(ffffffff829d1180) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112
uvmfault_lookup(ffff8000222b2b90,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1701
uvm_fault_check(ffff8000222b2b90,ffff8000222b2bc8,ffff8000222b2bf0) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674
uvm_fault(ffffffff829d1178,ffff8000254ad000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:601
kpageflttrap(ffff8000222b2d20,ffff8000254adde8) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264
kerntrap(ffff8000222b2d20) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
memcpy() at memcpy+0x15
timeout_run(ffff8000ffff75d0) at timeout_run+0xd6 timeout_sync_leave sys/kern/kern_timeout.c:207 [inline]
timeout_run(ffff8000ffff75d0) at timeout_run+0xd6 sys/kern/kern_timeout.c:680
softclock_process_tick_timeout(ffff8000ffff75d0,0) at softclock_process_tick_timeout+0x196 sys/kern/kern_timeout.c:725
softclock(0) at softclock+0x11a sys/kern/kern_timeout.c:756
softintr_dispatch(0) at softintr_dispatch+0xfb sys/arch/amd64/amd64/softintr.c:90
Xsoftclock() at Xsoftclock+0x1f
pmap_enter(fffffd806e5432a8,53df40cf000,6351c000,3,22) at pmap_enter+0x76f pmap_unmap_ptes sys/arch/amd64/amd64/pmap.c:431 [inline]
pmap_enter(fffffd806e5432a8,53df40cf000,6351c000,3,22) at pmap_enter+0x76f sys/arch/amd64/amd64/pmap.c:2848
uvm_fault_lower(ffff8000222b3290,ffff8000222b32c8,ffff8000222b3210,0) at uvm_fault_lower+0x6dd sys/uvm/uvm_fault.c:1461
uvm_fault(fffffd806f59e178,53df40cf000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638
upageflttrap(ffff8000222b3400,53df40cf000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181
usertrap(ffff8000222b3400) at usertrap+0x214 sys/arch/amd64/amd64/trap.c:403
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x53d52052b80, count: -22
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
x86_ipi_db(ffff800020d38ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
__mp_lock(ffffffff828dab38) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff828dab38) at __mp_lock+0x129 sys/kern/kern_lock.c:147
uvm_unmap_detach(ffff800021191860,1) at uvm_unmap_detach+0xfc sys/uvm/uvm_map.c:1586
uvm_map_teardown(fffffd806f59eb88) at uvm_map_teardown+0x262 sys/uvm/uvm_map.c:2762
uvmspace_free(fffffd806f59eb88) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3656
reaper(ffff800021193a48) at reaper+0x189 sys/kern/kern_exit.c:462
end trace frame: 0x0, count: 7
ddb{1}> trace
x86_ipi_db(ffff800020d38ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
__mp_lock(ffffffff828dab38) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff828dab38) at __mp_lock+0x129 sys/kern/kern_lock.c:147
uvm_unmap_detach(ffff800021191860,1) at uvm_unmap_detach+0xfc sys/uvm/uvm_map.c:1586
uvm_map_teardown(fffffd806f59eb88) at uvm_map_teardown+0x262 sys/uvm/uvm_map.c:2762
uvmspace_free(fffffd806f59eb88) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3656
reaper(ffff800021193a48) at reaper+0x189 sys/kern/kern_exit.c:462
end trace frame: 0x0, count: -8


---
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.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
Reply all
Reply to author
Forward
0 new messages