witness: reversal: lock order data missing (2)
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syzbot
May 13, 2021, 10:04:17 PM5/13/21
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: c070ace6 Improve mereg_add() like I did on arm64.
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=124c2965d00000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=1d5e345b0dd53f57443b
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+1d5e34...@syzkaller.appspotmail.com
witness: lock order reversal:
1st 0xfffffd807f7d6438 fdlock (&newfdp->fd_fd.fd_lock)
2nd 0xfffffd8065a50a30 inode (&ip->i_lock)
lock order data w2 -> w1 missing
lock order data w1 -> w2 missing
Stopped at db_enter+0x18: addq $0x8,%rsp
ddb{0}>
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
the kernel did not panic
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
witness_checkorder(fffffd8065a50a30,9,0) at witness_checkorder+0x108b
rw_enter(fffffd8065a50a20,81) at rw_enter+0xd4
rrw_enter(fffffd8065a50a20,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461
VOP_LOCK(fffffd806444f0f8,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614
vn_lock(fffffd806444f0f8,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579
uvn_get(fffffd80646ae918,0,ffff8000256b58f8,ffff8000256b58c8,0,0) at uvn_get+0x276 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline]
uvn_get(fffffd80646ae918,0,ffff8000256b58f8,ffff8000256b58c8,0,0) at uvn_get+0x276 sys/uvm/uvm_vnode.c:993
uvm_fault_lower(ffff8000256b5a60,ffff8000256b5a98,ffff8000256b59e0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251
uvm_fault(fffffd80084d62e0,20000000,0,2) at uvm_fault+0x256 sys/uvm/uvm_fault.c:638
kpageflttrap(ffff8000256b5bf0,20000180) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:262
kerntrap(ffff8000256b5bf0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:316
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
copyout() at copyout+0x53
syscall(ffff8000256b5e20) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000256b5e20) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x45c54945f20, count: -15
ddb{0}> show registers
rdi 0xffff8000212b0000
rsi 0xece7 __ALIGN_SIZE+0xdce7
rbp 0xffff8000256b5570
rbx 0x3
rdx 0xffff8000212b0000
rcx 0xece6 __ALIGN_SIZE+0xdce6
rax 0xffffffff8189f267 db_enter+0x17
r8 0xffffffff814607b1 witness_checkorder+0x1061
r9 0x5
r10 0x5ba357b7db013551
r11 0x56acbb12f2832cca
r12 0
r13 0xfffffd8065a50a30
r14 0
r15 0xfffffd8002cf9740
rip 0xffffffff8189f268 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff8000256b5560
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor.0) pid=112713 stat=onproc
flags process=10<SUGID> proc=4000000<THREAD>
pri=32, usrpri=78, nice=20
forw=0xffffffffffffffff, list=0xffff800021283500,0xffff8000212837b0
process=0xffff800021286610 user=0xffff8000256b0000, vmspace=0xfffffd80084d62e0
estcpu=36, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
63159 3739 7703 32767 2 0x10 syz-executor.1
97845 193507 38388 32767 7 0x10 syz-executor.0
*97845 112713 38388 32767 7 0x4000010 syz-executor.0
7703 190743 83573 32767 3 0x90 nanoslp syz-executor.1
83573 90274 18097 0 3 0x82 wait syz-executor.1
26094 423403 0 0 3 0x14200 bored sosplice
38388 235852 22022 32767 3 0x90 nanoslp syz-executor.0
22022 422339 18097 0 3 0x82 wait syz-executor.0
18097 85356 29313 0 3 0x82 thrsleep syz-fuzzer
18097 74011 29313 0 3 0x4000082 thrsleep syz-fuzzer
18097 127940 29313 0 3 0x4000082 kqread syz-fuzzer
18097 166109 29313 0 3 0x4000082 thrsleep syz-fuzzer
18097 263829 29313 0 3 0x4000082 thrsleep syz-fuzzer
18097 455197 29313 0 3 0x4000082 thrsleep syz-fuzzer
18097 259203 29313 0 3 0x4000082 thrsleep syz-fuzzer
18097 371577 29313 0 3 0x4000082 thrsleep syz-fuzzer
29313 19645 43008 0 3 0x10008a sigsusp ksh
43008 424168 43504 0 3 0x92 select sshd
59641 520459 1 0 3 0x100083 ttyin getty
43504 286133 1 0 3 0x80 select sshd
83017 139641 47305 73 3 0x100090 kqread syslogd
47305 390574 1 0 3 0x100082 netio syslogd
60578 358539 1 77 3 0x100090 poll dhclient
6361 441544 1 0 3 0x80 poll dhclient
75975 501484 0 0 3 0x14200 bored smr
89906 456142 0 0 2 0x14200 zerothread
67367 60579 0 0 3 0x14200 aiodoned aiodoned
84620 90373 0 0 3 0x14200 syncer update
48139 439534 0 0 3 0x14200 cleaner cleaner
1507 76119 0 0 3 0x14200 reaper reaper
59228 399077 0 0 3 0x14200 pgdaemon pagedaemon
46973 301856 0 0 3 0x14200 bored crynlk
91640 15205 0 0 3 0x14200 bored crypto
24696 440351 0 0 3 0x14200 bored viomb
40801 25623 0 0 3 0x40014200 acpi0 acpi0
53328 326507 0 0 3 0x40014200 idle1
88450 193742 0 0 3 0x14200 bored softnet
96469 321908 0 0 3 0x14200 bored systqmp
23830 46288 0 0 3 0x14200 bored systq
78774 213667 0 0 3 0x40014200 bored softclock
76207 362393 0 0 3 0x40014200 idle0
1 282393 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 97845 (syz-executor.0) thread 0xffff8000212822a0 (112713)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82948808)
#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+0x23a sys/uvm/uvm_fault.c:637
#2 kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:262
#3 kerntrap+0xef sys/arch/amd64/amd64/trap.c:316
#4 alltraps_kern_meltdown+0x7b
#5 copyout+0x53
#6 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline]
#6 syscall+0x5bf sys/arch/amd64/amd64/trap.c:585
#7 Xsyscall+0x128
exclusive rwlock fdlock r = 0 (0xfffffd807f7d6438)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 dopipe+0xe0
#2 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline]
#2 syscall+0x5bf sys/arch/amd64/amd64/trap.c:585
#3 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10117 6414K 6414K 78643K 11213 0
pcb 13 8K 8K 78643K 13 0
rtable 109 3K 3K 78643K 341 0
ifaddr 39 10K 10K 78643K 53 0
sysctl 2 0K 0K 78643K 2 0
counters 44 34K 34K 78643K 48 0
ioctlops 0 0K 2K 78643K 137 0
iov 0 0K 16K 78643K 127 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 1 0
vnodes 1216 76K 77K 78643K 1358 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 5K 78643K 27 0
VM map 2 1K 1K 78643K 2 0
sem 11 1K 1K 78643K 19 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12598 0
file desc 8 25K 33K 78643K 13988 0
sigio 0 0K 0K 78643K 46 0
proc 48 50K 82K 78643K 716 0
subproc 34 2K 2K 78643K 68 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 524 0
in_multi 33 2K 2K 78643K 158 0
ether_multi 1 0K 0K 78643K 19 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 43 201K 201K 78643K 43 0
exec 0 0K 2K 78643K 833 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 325 38K 38K 78643K 168887 0
UVM aobj 95 6K 6K 78643K 123 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 252 0
NDP 5 0K 0K 78643K 15 0
temp 101 3981K 4109K 78643K 30348 0
kqueue 3 4K 8K 78643K 217 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 20 0 0 1 0 1 1 0 8 0
rtpcb 120 173 0 171 1 0 1 1 0 8 0
rtentry 112 71 0 25 2 0 2 2 0 8 0
unpcb 120 2036 0 2026 1 0 1 1 0 8 0
syncache 296 97 0 97 9 9 0 1 0 8 0
sackhl 24 1 0 1 1 1 0 1 0 8 0
tcpqe 32 421 0 421 12 12 0 1 0 8 0
tcpcb 736 3407 0 3403 22 20 2 5 0 8 1
arp 120 11 0 5 1 0 1 1 0 8 0
ipq 40 4 0 4 2 2 0 1 0 8 0
ipqe 40 19 0 19 2 2 0 1 0 8 0
inpcb 304 4759 0 4753 7 6 1 3 0 8 0
ip6q 72 12 0 12 3 3 0 1 0 8 0
ip6af 40 23 0 23 3 3 0 1 0 8 0
nd6 48 15 0 7 1 0 1 1 0 8 0
kcovpl 48 4 0 2 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 311 0 90 14 0 14 14 0 8 0
art_table 32 312 0 90 2 0 2 2 0 8 0
art_node 16 70 0 28 1 0 1 1 0 8 0
sysvmsgpl 40 8 0 8 1 1 0 1 0 8 0
semupl 112 12 0 12 1 1 0 1 0 8 0
semapl 112 17 0 8 1 0 1 1 0 8 0
shmpl 112 120 0 28 3 0 3 3 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 16224 0 14818 94 6 88 89 0 8 0
ffsino 272 16224 0 14818 95 0 95 95 0 8 0
nchpl 144 32907 0 31318 60 0 60 60 0 8 0
uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0
vnodes 224 5926 0 0 349 0 349 349 0 8 0
namei 1024 72060 0 72060 1 0 1 1 0 8 1
percpumem 16 35 0 2 1 0 1 1 0 8 0
scxspl 216 93861 0 93860 18 17 1 8 0 8 0
plimitpl 152 191 0 182 1 0 1 1 0 8 0
sigapl 424 14170 0 14136 4 0 4 4 0 8 0
futexpl 56 149329 0 149329 1 0 1 1 0 8 1
knotepl 112 313 0 293 1 0 1 1 0 8 0
kqueuepl 168 15036 0 15021 7 6 1 2 0 8 0
pipepl 336 539 0 527 9 7 2 2 0 8 0
fdescpl 496 14153 0 14136 3 0 3 3 0 8 0
filepl 152 45006 0 44905 10 5 5 5 0 8 1
lockfpl 104 669 0 667 1 0 1 1 0 8 0
lockfspl 48 247 0 245 1 0 1 1 0 8 0
sessionpl 144 19 0 9 1 0 1 1 0 8 0
pgrppl 48 35 0 25 1 0 1 1 0 8 0
ucredpl 96 3063 0 3054 1 0 1 1 0 8 0
zombiepl 144 14136 0 14136 1 0 1 1 0 8 1
processpl 1080 14170 0 14136 4 1 3 3 0 8 0
procpl 672 30494 0 30452 4 0 4 4 0 8 0
sosppl 168 118 0 118 8 8 0 1 0 8 0
sockpl 480 7009 0 6991 16 13 3 6 0 8 0
mcl64k 65536 25 0 0 4 0 4 4 0 8 0
mcl16k 16384 18 0 0 3 0 3 3 0 8 0
mcl12k 12288 26 0 0 2 0 2 2 0 8 0
mcl9k 9216 5 0 0 1 0 1 1 0 8 0
mcl8k 8192 18 0 0 3 1 2 3 0 8 0
mcl4k 4096 25 0 0 3 0 3 3 0 8 0
mcl2k2 2112 11 0 0 1 0 1 1 0 8 0
mcl2k 2048 506 0 0 30 0 30 30 0 8 0
mtagpl 96 1 0 0 1 0 1 1 0 8 0
mbufpl 256 1266 0 0 72 0 72 72 0 8 0
bufpl 280 23980 0 17716 448 0 448 448 0 8 0
anonpl 24 3571280 0 3547048 212 63 149 149 0 186 2
amapchunkpl 152 396880 0 396156 54 24 30 33 0 158 2
amappl16 200 22370 0 21471 87 39 48 48 0 8 0
amappl15 192 3793 0 3786 1 0 1 1 0 8 0
amappl14 184 10 0 5 1 0 1 1 0 8 0
amappl13 176 3091 0 3090 1 0 1 1 0 8 0
amappl12 168 7291 0 7282 1 0 1 1 0 8 0
amappl11 160 46 0 39 1 0 1 1 0 8 0
amappl10 152 29 0 24 1 0 1 1 0 8 0
amappl9 144 150 0 149 1 0 1 1 0 8 0
amappl8 136 587 0 464 5 0 5 5 0 8 0
amappl7 128 65 0 53 1 0 1 1 0 8 0
amappl6 120 128 0 100 1 0 1 1 0 8 0
amappl5 112 7179 0 7169 1 0 1 1 0 8 0
amappl4 104 7876 0 7842 1 0 1 1 0 8 0
amappl3 96 3525 0 3520 1 0 1 1 0 8 0
amappl2 88 7834 0 7784 2 0 2 2 0 8 0
amappl1 80 243149 0 242726 15 5 10 12 0 8 0
amappl 88 166736 0 166551 5 0 5 5 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 64 122 0 28 3 1 2 2 0 8 0
uaddrrnd 24 14153 0 14136 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 14153 0 14136 1 0 1 1 0 8 0
vmmpekpl 168 76102 0 76083 2 0 2 2 0 8 0
vmmpepl 168 1620302 0 1617853 155 46 109 111 0 357 2
vmsppl 368 14152 0 14136 2 0 2 2 0 8 0
rwobjpl 56 267644 0 265974 36 12 24 25 0 8 0
pdppl 4096 28313 0 28272 55 14 41 45 0 8 0
pvpl 32 7994466 0 7966687 353 123 230 230 0 265 5
pmappl 232 14152 0 14136 2 1 1 2 0 8 0
extentpl 40 58 0 40 1 0 1 1 0 8 0
phpool 112 414 0 50 11 0 11 11 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
witness_checkorder(fffffd8065a50a30,9,0) at witness_checkorder+0x108b
rw_enter(fffffd8065a50a20,81) at rw_enter+0xd4
rrw_enter(fffffd8065a50a20,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461
VOP_LOCK(fffffd806444f0f8,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614
vn_lock(fffffd806444f0f8,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579
uvn_get(fffffd80646ae918,0,ffff8000256b58f8,ffff8000256b58c8,0,0) at uvn_get+0x276 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline]
uvn_get(fffffd80646ae918,0,ffff8000256b58f8,ffff8000256b58c8,0,0) at uvn_get+0x276 sys/uvm/uvm_vnode.c:993
uvm_fault_lower(ffff8000256b5a60,ffff8000256b5a98,ffff8000256b59e0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251
uvm_fault(fffffd80084d62e0,20000000,0,2) at uvm_fault+0x256 sys/uvm/uvm_fault.c:638
kpageflttrap(ffff8000256b5bf0,20000180) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:262
kerntrap(ffff8000256b5bf0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:316
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
copyout() at copyout+0x53
syscall(ffff8000256b5e20) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000256b5e20) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x45c54945f20, count: -15
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
ddb{1}> trace
x86_ipi_db(ffff800020d58ff0) 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
__sanitizer_cov_trace_switch(0,ffffffff82766300) at __sanitizer_cov_trace_switch+0x98 kd_curproc sys/dev/kcov.c:570 [inline]
__sanitizer_cov_trace_switch(0,ffffffff82766300) at __sanitizer_cov_trace_switch+0x98 trace_cmp sys/dev/kcov.c:165 [inline]
__sanitizer_cov_trace_switch(0,ffffffff82766300) at __sanitizer_cov_trace_switch+0x98 sys/dev/kcov.c:262
syscall(ffff8000212a1670) at syscall+0x610 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffca520, 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.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following issue on:
HEAD commit: c070ace6 Improve mereg_add() like I did on arm64.
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=124c2965d00000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=1d5e345b0dd53f57443b
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+1d5e34...@syzkaller.appspotmail.com
witness: lock order reversal:
1st 0xfffffd807f7d6438 fdlock (&newfdp->fd_fd.fd_lock)
2nd 0xfffffd8065a50a30 inode (&ip->i_lock)
lock order data w2 -> w1 missing
lock order data w1 -> w2 missing
Stopped at db_enter+0x18: addq $0x8,%rsp
ddb{0}>
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
the kernel did not panic
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
witness_checkorder(fffffd8065a50a30,9,0) at witness_checkorder+0x108b
rw_enter(fffffd8065a50a20,81) at rw_enter+0xd4
rrw_enter(fffffd8065a50a20,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461
VOP_LOCK(fffffd806444f0f8,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614
vn_lock(fffffd806444f0f8,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579
uvn_get(fffffd80646ae918,0,ffff8000256b58f8,ffff8000256b58c8,0,0) at uvn_get+0x276 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline]
uvn_get(fffffd80646ae918,0,ffff8000256b58f8,ffff8000256b58c8,0,0) at uvn_get+0x276 sys/uvm/uvm_vnode.c:993
uvm_fault_lower(ffff8000256b5a60,ffff8000256b5a98,ffff8000256b59e0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251
uvm_fault(fffffd80084d62e0,20000000,0,2) at uvm_fault+0x256 sys/uvm/uvm_fault.c:638
kpageflttrap(ffff8000256b5bf0,20000180) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:262
kerntrap(ffff8000256b5bf0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:316
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
copyout() at copyout+0x53
syscall(ffff8000256b5e20) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000256b5e20) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x45c54945f20, count: -15
ddb{0}> show registers
rdi 0xffff8000212b0000
rsi 0xece7 __ALIGN_SIZE+0xdce7
rbp 0xffff8000256b5570
rbx 0x3
rdx 0xffff8000212b0000
rcx 0xece6 __ALIGN_SIZE+0xdce6
rax 0xffffffff8189f267 db_enter+0x17
r8 0xffffffff814607b1 witness_checkorder+0x1061
r9 0x5
r10 0x5ba357b7db013551
r11 0x56acbb12f2832cca
r12 0
r13 0xfffffd8065a50a30
r14 0
r15 0xfffffd8002cf9740
rip 0xffffffff8189f268 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff8000256b5560
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor.0) pid=112713 stat=onproc
flags process=10<SUGID> proc=4000000<THREAD>
pri=32, usrpri=78, nice=20
forw=0xffffffffffffffff, list=0xffff800021283500,0xffff8000212837b0
process=0xffff800021286610 user=0xffff8000256b0000, vmspace=0xfffffd80084d62e0
estcpu=36, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
63159 3739 7703 32767 2 0x10 syz-executor.1
97845 193507 38388 32767 7 0x10 syz-executor.0
*97845 112713 38388 32767 7 0x4000010 syz-executor.0
7703 190743 83573 32767 3 0x90 nanoslp syz-executor.1
83573 90274 18097 0 3 0x82 wait syz-executor.1
26094 423403 0 0 3 0x14200 bored sosplice
38388 235852 22022 32767 3 0x90 nanoslp syz-executor.0
22022 422339 18097 0 3 0x82 wait syz-executor.0
18097 85356 29313 0 3 0x82 thrsleep syz-fuzzer
18097 74011 29313 0 3 0x4000082 thrsleep syz-fuzzer
18097 127940 29313 0 3 0x4000082 kqread syz-fuzzer
18097 166109 29313 0 3 0x4000082 thrsleep syz-fuzzer
18097 263829 29313 0 3 0x4000082 thrsleep syz-fuzzer
18097 455197 29313 0 3 0x4000082 thrsleep syz-fuzzer
18097 259203 29313 0 3 0x4000082 thrsleep syz-fuzzer
18097 371577 29313 0 3 0x4000082 thrsleep syz-fuzzer
29313 19645 43008 0 3 0x10008a sigsusp ksh
43008 424168 43504 0 3 0x92 select sshd
59641 520459 1 0 3 0x100083 ttyin getty
43504 286133 1 0 3 0x80 select sshd
83017 139641 47305 73 3 0x100090 kqread syslogd
47305 390574 1 0 3 0x100082 netio syslogd
60578 358539 1 77 3 0x100090 poll dhclient
6361 441544 1 0 3 0x80 poll dhclient
75975 501484 0 0 3 0x14200 bored smr
89906 456142 0 0 2 0x14200 zerothread
67367 60579 0 0 3 0x14200 aiodoned aiodoned
84620 90373 0 0 3 0x14200 syncer update
48139 439534 0 0 3 0x14200 cleaner cleaner
1507 76119 0 0 3 0x14200 reaper reaper
59228 399077 0 0 3 0x14200 pgdaemon pagedaemon
46973 301856 0 0 3 0x14200 bored crynlk
91640 15205 0 0 3 0x14200 bored crypto
24696 440351 0 0 3 0x14200 bored viomb
40801 25623 0 0 3 0x40014200 acpi0 acpi0
53328 326507 0 0 3 0x40014200 idle1
88450 193742 0 0 3 0x14200 bored softnet
96469 321908 0 0 3 0x14200 bored systqmp
23830 46288 0 0 3 0x14200 bored systq
78774 213667 0 0 3 0x40014200 bored softclock
76207 362393 0 0 3 0x40014200 idle0
1 282393 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 97845 (syz-executor.0) thread 0xffff8000212822a0 (112713)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82948808)
#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+0x23a sys/uvm/uvm_fault.c:637
#2 kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:262
#3 kerntrap+0xef sys/arch/amd64/amd64/trap.c:316
#4 alltraps_kern_meltdown+0x7b
#5 copyout+0x53
#6 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline]
#6 syscall+0x5bf sys/arch/amd64/amd64/trap.c:585
#7 Xsyscall+0x128
exclusive rwlock fdlock r = 0 (0xfffffd807f7d6438)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 dopipe+0xe0
#2 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline]
#2 syscall+0x5bf sys/arch/amd64/amd64/trap.c:585
#3 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10117 6414K 6414K 78643K 11213 0
pcb 13 8K 8K 78643K 13 0
rtable 109 3K 3K 78643K 341 0
ifaddr 39 10K 10K 78643K 53 0
sysctl 2 0K 0K 78643K 2 0
counters 44 34K 34K 78643K 48 0
ioctlops 0 0K 2K 78643K 137 0
iov 0 0K 16K 78643K 127 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 1 0
vnodes 1216 76K 77K 78643K 1358 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 5K 78643K 27 0
VM map 2 1K 1K 78643K 2 0
sem 11 1K 1K 78643K 19 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12598 0
file desc 8 25K 33K 78643K 13988 0
sigio 0 0K 0K 78643K 46 0
proc 48 50K 82K 78643K 716 0
subproc 34 2K 2K 78643K 68 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 524 0
in_multi 33 2K 2K 78643K 158 0
ether_multi 1 0K 0K 78643K 19 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 43 201K 201K 78643K 43 0
exec 0 0K 2K 78643K 833 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 325 38K 38K 78643K 168887 0
UVM aobj 95 6K 6K 78643K 123 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 252 0
NDP 5 0K 0K 78643K 15 0
temp 101 3981K 4109K 78643K 30348 0
kqueue 3 4K 8K 78643K 217 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 20 0 0 1 0 1 1 0 8 0
rtpcb 120 173 0 171 1 0 1 1 0 8 0
rtentry 112 71 0 25 2 0 2 2 0 8 0
unpcb 120 2036 0 2026 1 0 1 1 0 8 0
syncache 296 97 0 97 9 9 0 1 0 8 0
sackhl 24 1 0 1 1 1 0 1 0 8 0
tcpqe 32 421 0 421 12 12 0 1 0 8 0
tcpcb 736 3407 0 3403 22 20 2 5 0 8 1
arp 120 11 0 5 1 0 1 1 0 8 0
ipq 40 4 0 4 2 2 0 1 0 8 0
ipqe 40 19 0 19 2 2 0 1 0 8 0
inpcb 304 4759 0 4753 7 6 1 3 0 8 0
ip6q 72 12 0 12 3 3 0 1 0 8 0
ip6af 40 23 0 23 3 3 0 1 0 8 0
nd6 48 15 0 7 1 0 1 1 0 8 0
kcovpl 48 4 0 2 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 311 0 90 14 0 14 14 0 8 0
art_table 32 312 0 90 2 0 2 2 0 8 0
art_node 16 70 0 28 1 0 1 1 0 8 0
sysvmsgpl 40 8 0 8 1 1 0 1 0 8 0
semupl 112 12 0 12 1 1 0 1 0 8 0
semapl 112 17 0 8 1 0 1 1 0 8 0
shmpl 112 120 0 28 3 0 3 3 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 16224 0 14818 94 6 88 89 0 8 0
ffsino 272 16224 0 14818 95 0 95 95 0 8 0
nchpl 144 32907 0 31318 60 0 60 60 0 8 0
uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0
vnodes 224 5926 0 0 349 0 349 349 0 8 0
namei 1024 72060 0 72060 1 0 1 1 0 8 1
percpumem 16 35 0 2 1 0 1 1 0 8 0
scxspl 216 93861 0 93860 18 17 1 8 0 8 0
plimitpl 152 191 0 182 1 0 1 1 0 8 0
sigapl 424 14170 0 14136 4 0 4 4 0 8 0
futexpl 56 149329 0 149329 1 0 1 1 0 8 1
knotepl 112 313 0 293 1 0 1 1 0 8 0
kqueuepl 168 15036 0 15021 7 6 1 2 0 8 0
pipepl 336 539 0 527 9 7 2 2 0 8 0
fdescpl 496 14153 0 14136 3 0 3 3 0 8 0
filepl 152 45006 0 44905 10 5 5 5 0 8 1
lockfpl 104 669 0 667 1 0 1 1 0 8 0
lockfspl 48 247 0 245 1 0 1 1 0 8 0
sessionpl 144 19 0 9 1 0 1 1 0 8 0
pgrppl 48 35 0 25 1 0 1 1 0 8 0
ucredpl 96 3063 0 3054 1 0 1 1 0 8 0
zombiepl 144 14136 0 14136 1 0 1 1 0 8 1
processpl 1080 14170 0 14136 4 1 3 3 0 8 0
procpl 672 30494 0 30452 4 0 4 4 0 8 0
sosppl 168 118 0 118 8 8 0 1 0 8 0
sockpl 480 7009 0 6991 16 13 3 6 0 8 0
mcl64k 65536 25 0 0 4 0 4 4 0 8 0
mcl16k 16384 18 0 0 3 0 3 3 0 8 0
mcl12k 12288 26 0 0 2 0 2 2 0 8 0
mcl9k 9216 5 0 0 1 0 1 1 0 8 0
mcl8k 8192 18 0 0 3 1 2 3 0 8 0
mcl4k 4096 25 0 0 3 0 3 3 0 8 0
mcl2k2 2112 11 0 0 1 0 1 1 0 8 0
mcl2k 2048 506 0 0 30 0 30 30 0 8 0
mtagpl 96 1 0 0 1 0 1 1 0 8 0
mbufpl 256 1266 0 0 72 0 72 72 0 8 0
bufpl 280 23980 0 17716 448 0 448 448 0 8 0
anonpl 24 3571280 0 3547048 212 63 149 149 0 186 2
amapchunkpl 152 396880 0 396156 54 24 30 33 0 158 2
amappl16 200 22370 0 21471 87 39 48 48 0 8 0
amappl15 192 3793 0 3786 1 0 1 1 0 8 0
amappl14 184 10 0 5 1 0 1 1 0 8 0
amappl13 176 3091 0 3090 1 0 1 1 0 8 0
amappl12 168 7291 0 7282 1 0 1 1 0 8 0
amappl11 160 46 0 39 1 0 1 1 0 8 0
amappl10 152 29 0 24 1 0 1 1 0 8 0
amappl9 144 150 0 149 1 0 1 1 0 8 0
amappl8 136 587 0 464 5 0 5 5 0 8 0
amappl7 128 65 0 53 1 0 1 1 0 8 0
amappl6 120 128 0 100 1 0 1 1 0 8 0
amappl5 112 7179 0 7169 1 0 1 1 0 8 0
amappl4 104 7876 0 7842 1 0 1 1 0 8 0
amappl3 96 3525 0 3520 1 0 1 1 0 8 0
amappl2 88 7834 0 7784 2 0 2 2 0 8 0
amappl1 80 243149 0 242726 15 5 10 12 0 8 0
amappl 88 166736 0 166551 5 0 5 5 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 64 122 0 28 3 1 2 2 0 8 0
uaddrrnd 24 14153 0 14136 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 14153 0 14136 1 0 1 1 0 8 0
vmmpekpl 168 76102 0 76083 2 0 2 2 0 8 0
vmmpepl 168 1620302 0 1617853 155 46 109 111 0 357 2
vmsppl 368 14152 0 14136 2 0 2 2 0 8 0
rwobjpl 56 267644 0 265974 36 12 24 25 0 8 0
pdppl 4096 28313 0 28272 55 14 41 45 0 8 0
pvpl 32 7994466 0 7966687 353 123 230 230 0 265 5
pmappl 232 14152 0 14136 2 1 1 2 0 8 0
extentpl 40 58 0 40 1 0 1 1 0 8 0
phpool 112 414 0 50 11 0 11 11 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
witness_checkorder(fffffd8065a50a30,9,0) at witness_checkorder+0x108b
rw_enter(fffffd8065a50a20,81) at rw_enter+0xd4
rrw_enter(fffffd8065a50a20,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461
VOP_LOCK(fffffd806444f0f8,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614
vn_lock(fffffd806444f0f8,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579
uvn_get(fffffd80646ae918,0,ffff8000256b58f8,ffff8000256b58c8,0,0) at uvn_get+0x276 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline]
uvn_get(fffffd80646ae918,0,ffff8000256b58f8,ffff8000256b58c8,0,0) at uvn_get+0x276 sys/uvm/uvm_vnode.c:993
uvm_fault_lower(ffff8000256b5a60,ffff8000256b5a98,ffff8000256b59e0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251
uvm_fault(fffffd80084d62e0,20000000,0,2) at uvm_fault+0x256 sys/uvm/uvm_fault.c:638
kpageflttrap(ffff8000256b5bf0,20000180) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:262
kerntrap(ffff8000256b5bf0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:316
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
copyout() at copyout+0x53
syscall(ffff8000256b5e20) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000256b5e20) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x45c54945f20, count: -15
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
ddb{1}> trace
x86_ipi_db(ffff800020d58ff0) 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
__sanitizer_cov_trace_switch(0,ffffffff82766300) at __sanitizer_cov_trace_switch+0x98 kd_curproc sys/dev/kcov.c:570 [inline]
__sanitizer_cov_trace_switch(0,ffffffff82766300) at __sanitizer_cov_trace_switch+0x98 trace_cmp sys/dev/kcov.c:165 [inline]
__sanitizer_cov_trace_switch(0,ffffffff82766300) at __sanitizer_cov_trace_switch+0x98 sys/dev/kcov.c:262
syscall(ffff8000212a1670) at syscall+0x610 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffca520, 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.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot
May 17, 2021, 7:35:25 PM5/17/21
to syzkaller-o...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: 80612697 Revert. Last change should not have been committed.
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=13568f2dd00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14bec973d00000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1d5e34...@syzkaller.appspotmail.com
login: witness: lock order reversal:
1st 0xfffffd8078de3258 fdlock (&newfdp->fd_fd.fd_lock)
2nd 0xfffffd806d6f13d8 inode (&ip->i_lock)
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
rw_enter(fffffd806d6f13c8,81) at rw_enter+0xd4
rrw_enter(fffffd806d6f13c8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461
VOP_LOCK(fffffd8078819ea0,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614
vn_lock(fffffd8078819ea0,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579
uvn_get(fffffd806ce810f0,0,ffff80002126ec08,ffff80002126ebd8,0,2) at uvn_get+0x276 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline]
uvn_get(fffffd806ce810f0,0,ffff80002126ec08,ffff80002126ebd8,0,2) at uvn_get+0x276 sys/uvm/uvm_vnode.c:993
uvm_fault_lower(ffff80002126ed70,ffff80002126eda8,ffff80002126ecf0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251
uvm_fault(fffffd807f00aa10,20000000,0,2) at uvm_fault+0x256 sys/uvm/uvm_fault.c:638
kpageflttrap(ffff80002126ef00,20000040) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:262
kerntrap(ffff80002126ef00) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:316
syscall(ffff80002126f130) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585
ddb{1}> show registers
rdi 0x3
rsi 0xffffffff82701ff0 __sancov_gen_cov_switch_values.134
rbp 0xffff80002126e880
rbx 0x3
rdx 0x8b
rcx 0x3
rax 0x1
r8 0xffffffff8157e211 witness_checkorder+0x1061
r9 0x5
r10 0xa5633de55a00ae8
r11 0xe65e1acd83735101
r12 0
r13 0xfffffd806d6f13d8
r14 0
r15 0xfffffd8002cfa740
rip 0xffffffff8215de78 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff80002126e870
PROC (syz-executor1318) pid=437562 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=17, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff8000211b2548,0xffff8000211ffcf0
process=0xffff800021225528 user=0xffff80002126a000, vmspace=0xfffffd807f00aa10
18658 147011 33679 0 2 0x4000000 syz-executor1318
18658 279271 33679 0 2 0x4000000 syz-executor1318
81172 122678 68255 0 7 0 syz-executor1318
81172 120155 68255 0 2 0x4000000 syz-executor1318
*81172 437562 68255 0 7 0x4000000 syz-executor1318
68255 204459 26179 0 3 0x80 nanoslp syz-executor1318
33679 41886 26179 0 3 0x80 nanoslp syz-executor1318
26179 435943 34781 0 3 0x82 nanoslp syz-executor1318
34781 106065 75170 0 3 0x10008a sigsusp ksh
75170 13804 62453 0 3 0x92 select sshd
84191 8621 1 0 3 0x100083 ttyin getty
62453 515962 1 0 3 0x80 select sshd
5006 457843 94027 74 3 0x100092 bpf pflogd
94027 361569 1 0 3 0x80 netio pflogd
78923 452222 47376 73 3 0x100090 kqread syslogd
47376 314832 1 0 3 0x100082 netio syslogd
42503 373725 1 77 3 0x100090 poll dhclient
96507 362896 1 0 3 0x80 poll dhclient
61410 167439 0 0 3 0x14200 bored smr
56402 233381 0 0 2 0x14200 zerothread
75076 500739 0 0 3 0x14200 aiodoned aiodoned
94364 509141 0 0 3 0x14200 syncer update
4182 18791 0 0 3 0x14200 cleaner cleaner
25683 369622 0 0 3 0x14200 reaper reaper
69374 20730 0 0 3 0x14200 pgdaemon pagedaemon
24845 41843 0 0 3 0x14200 bored crynlk
13311 474656 0 0 3 0x14200 bored crypto
16610 314362 0 0 3 0x14200 bored viomb
38177 462861 0 0 3 0x40014200 acpi0 acpi0
25468 378697 0 0 3 0x40014200 idle1
21756 25469 0 0 3 0x14200 bored softnet
24875 110186 0 0 3 0x14200 bored systqmp
55786 27774 0 0 3 0x14200 bored systq
9218 518078 0 0 3 0x40014200 bored softclock
72794 155600 0 0 3 0x40014200 idle0
1 275794 0 0 3 0x82 wait init
Process 81172 (syz-executor1318) thread 0xffff8000ffff7cf0 (437562)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828b2e60)
ifaddr 29 8K 8K 78643K 30 0
counters 40 33K 33K 78643K 40 0
ioctlops 0 0K 4K 78643K 1467 0
proc 59 63K 71K 78643K 357 0
ether_multi 1 0K 0K 78643K 1 0
exec 0 0K 2K 78643K 300 0
UVM aobj 3 2K 2K 78643K 3 0
temp 23 3969K 4033K 78643K 1745 0
kqueue 2 2K 2K 78643K 2 0
rtentry 112 23 0 1 1 0 1 1 0 8 0
unpcb 120 163 0 151 1 0 1 1 0 8 0
syncache 296 5 0 5 2 1 1 1 0 8 1
tcpcb 736 8 0 5 1 0 1 1 0 8 0
arp 120 2 0 0 1 0 1 1 0 8 0
inpcb 304 28 0 23 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 9 0 2 1 0 1 1 0 8 0
pfstkey 112 9 0 2 1 0 1 1 0 8 0
pfstate 320 9 0 2 1 0 1 1 0 8 0
pfrule 1360 21 0 16 2 1 1 2 0 8 0
art_table 32 98 0 0 1 0 1 1 0 8 0
art_node 16 22 0 2 1 0 1 1 0 8 0
ffsino 272 1504 0 115 93 0 93 93 0 8 0
nchpl 144 1715 0 167 58 0 58 58 0 8 0
uvmvnodes 72 1514 0 0 28 0 28 28 0 8 0
vnodes 224 1514 0 0 90 0 90 90 0 8 0
namei 1024 4052 0 4052 2 1 1 1 0 8 1
percpumem 16 31 0 0 1 0 1 1 0 8 0
scxspl 216 3974 0 3974 11 10 1 8 0 8 1
plimitpl 152 14 0 8 1 0 1 1 0 8 0
sigapl 424 257 0 224 4 0 4 4 0 8 0
futexpl 56 75 0 75 1 0 1 1 0 8 1
knotepl 112 5 0 0 1 0 1 1 0 8 0
kqueuepl 168 1 0 0 1 0 1 1 0 8 0
pipepl 336 64 0 60 2 1 1 1 0 8 0
fdescpl 496 241 0 224 3 0 3 3 0 8 0
filepl 152 1091 0 1041 2 0 2 2 0 8 0
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 9 1 0 1 1 0 8 0
pgrppl 48 18 0 9 1 0 1 1 0 8 0
ucredpl 96 62 0 53 1 0 1 1 0 8 0
zombiepl 144 224 0 224 2 1 1 1 0 8 1
processpl 1080 257 0 224 3 0 3 3 0 8 0
procpl 672 296 0 259 4 0 4 4 0 8 0
sockpl 480 206 0 187 4 1 3 3 0 8 0
mcl8k 8192 3 0 0 1 0 1 1 0 8 0
mcl2k 2048 82 0 0 11 0 11 11 0 8 0
bufpl 280 2056 0 90 141 0 141 141 0 8 0
anonpl 24 35780 0 33232 18 2 16 16 0 186 0
amapchunkpl 152 3504 0 3322 9 1 8 8 0 158 1
amappl16 200 66 0 62 1 0 1 1 0 8 0
amappl15 192 51 0 46 1 0 1 1 0 8 0
amappl13 176 14 0 13 2 1 1 1 0 8 0
amappl12 168 27 0 24 1 0 1 1 0 8 0
amappl11 160 44 0 32 1 0 1 1 0 8 0
amappl10 152 6 0 2 1 0 1 1 0 8 0
amappl9 144 241 0 241 3 2 1 1 0 8 1
amappl8 136 240 0 235 1 0 1 1 0 8 0
amappl7 128 36 0 32 1 0 1 1 0 8 0
amappl6 120 82 0 73 1 0 1 1 0 8 0
amappl5 112 137 0 127 1 0 1 1 0 8 0
amappl4 104 504 0 482 1 0 1 1 0 8 0
amappl3 96 68 0 62 1 0 1 1 0 8 0
amappl2 88 345 0 306 1 0 1 1 0 8 0
amappl1 80 7038 0 6644 12 3 9 9 0 8 0
amappl 88 1628 0 1548 2 0 2 2 0 92 0
uaddrrnd 24 241 0 224 1 0 1 1 0 8 0
vmmpekpl 168 5592 0 5575 1 0 1 1 0 8 0
vmmpepl 168 21769 0 20802 46 3 43 43 0 357 0
vmsppl 368 240 0 224 2 0 2 2 0 8 0
rwobjpl 56 6618 0 6085 10 2 8 8 0 8 0
pdppl 4096 489 0 448 59 18 41 41 0 8 0
pvpl 32 107277 0 102784 44 7 37 37 0 265 0
pmappl 232 240 0 224 1 0 1 1 0 8 0
ddb{1}> machine ddbcpu 0
x86_ipi_db(ffffffff8270cff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352
__mp_lock(ffffffff828b2c58) at __mp_lock+0x122 sys/kern/kern_lock.c:147
softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90
Xsoftclock() at Xsoftclock+0x1f
end of kernel
end trace frame: 0x7f7ffffe8bd0, count: -6
ddb{1}> trace
rw_enter(fffffd806d6f13c8,81) at rw_enter+0xd4
rrw_enter(fffffd806d6f13c8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461
VOP_LOCK(fffffd8078819ea0,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614
vn_lock(fffffd8078819ea0,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579
uvn_get(fffffd806ce810f0,0,ffff80002126ec08,ffff80002126ebd8,0,2) at uvn_get+0x276 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline]
uvn_get(fffffd806ce810f0,0,ffff80002126ec08,ffff80002126ebd8,0,2) at uvn_get+0x276 sys/uvm/uvm_vnode.c:993
uvm_fault_lower(ffff80002126ed70,ffff80002126eda8,ffff80002126ecf0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251
uvm_fault(fffffd807f00aa10,20000000,0,2) at uvm_fault+0x256 sys/uvm/uvm_fault.c:638
kpageflttrap(ffff80002126ef00,20000040) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:262
kerntrap(ffff80002126ef00) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:316
syscall(ffff80002126f130) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585
ddb{1}>
HEAD commit: 80612697 Revert. Last change should not have been committed.
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=13568f2dd00000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=1d5e345b0dd53f57443b
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17287f0dd00000
dashboard link: https://syzkaller.appspot.com/bug?extid=1d5e345b0dd53f57443b
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14bec973d00000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1d5e34...@syzkaller.appspotmail.com
1st 0xfffffd8078de3258 fdlock (&newfdp->fd_fd.fd_lock)
2nd 0xfffffd806d6f13d8 inode (&ip->i_lock)
lock order data w2 -> w1 missing
lock order data w1 -> w2 missing
Stopped at db_enter+0x18: addq $0x8,%rsp
ddb{1}>
lock order data w1 -> w2 missing
Stopped at db_enter+0x18: addq $0x8,%rsp
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
the kernel did not panic
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
witness_checkorder(fffffd806d6f13d8,9,0) at witness_checkorder+0x108b
rw_enter(fffffd806d6f13c8,81) at rw_enter+0xd4
rrw_enter(fffffd806d6f13c8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461
VOP_LOCK(fffffd8078819ea0,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614
vn_lock(fffffd8078819ea0,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579
uvn_get(fffffd806ce810f0,0,ffff80002126ec08,ffff80002126ebd8,0,2) at uvn_get+0x276 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline]
uvn_get(fffffd806ce810f0,0,ffff80002126ec08,ffff80002126ebd8,0,2) at uvn_get+0x276 sys/uvm/uvm_vnode.c:993
uvm_fault_lower(ffff80002126ed70,ffff80002126eda8,ffff80002126ecf0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251
uvm_fault(fffffd807f00aa10,20000000,0,2) at uvm_fault+0x256 sys/uvm/uvm_fault.c:638
kpageflttrap(ffff80002126ef00,20000040) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:262
kerntrap(ffff80002126ef00) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:316
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
copyout() at copyout+0x53
syscall(ffff80002126f130) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline]
copyout() at copyout+0x53
syscall(ffff80002126f130) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x2229aa33480, count: -15
end of kernel
ddb{1}> show registers
rdi 0x3
rsi 0xffffffff82701ff0 __sancov_gen_cov_switch_values.134
rbp 0xffff80002126e880
rbx 0x3
rdx 0x8b
rcx 0x3
rax 0x1
r8 0xffffffff8157e211 witness_checkorder+0x1061
r9 0x5
r10 0xa5633de55a00ae8
r11 0xe65e1acd83735101
r12 0
r13 0xfffffd806d6f13d8
r14 0
r15 0xfffffd8002cfa740
rip 0xffffffff8215de78 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff80002126e870
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
db_enter+0x18: addq $0x8,%rsp
PROC (syz-executor1318) pid=437562 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=17, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff8000211b2548,0xffff8000211ffcf0
process=0xffff800021225528 user=0xffff80002126a000, vmspace=0xfffffd807f00aa10
estcpu=36, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb{1}> ps
user=0, sys=0, intr=0
PID TID PPID UID S FLAGS WAIT COMMAND
18658 367970 33679 0 2 0 syz-executor1318
18658 147011 33679 0 2 0x4000000 syz-executor1318
18658 279271 33679 0 2 0x4000000 syz-executor1318
81172 122678 68255 0 7 0 syz-executor1318
81172 120155 68255 0 2 0x4000000 syz-executor1318
*81172 437562 68255 0 7 0x4000000 syz-executor1318
68255 204459 26179 0 3 0x80 nanoslp syz-executor1318
33679 41886 26179 0 3 0x80 nanoslp syz-executor1318
26179 435943 34781 0 3 0x82 nanoslp syz-executor1318
34781 106065 75170 0 3 0x10008a sigsusp ksh
75170 13804 62453 0 3 0x92 select sshd
84191 8621 1 0 3 0x100083 ttyin getty
62453 515962 1 0 3 0x80 select sshd
5006 457843 94027 74 3 0x100092 bpf pflogd
94027 361569 1 0 3 0x80 netio pflogd
78923 452222 47376 73 3 0x100090 kqread syslogd
47376 314832 1 0 3 0x100082 netio syslogd
42503 373725 1 77 3 0x100090 poll dhclient
96507 362896 1 0 3 0x80 poll dhclient
61410 167439 0 0 3 0x14200 bored smr
56402 233381 0 0 2 0x14200 zerothread
75076 500739 0 0 3 0x14200 aiodoned aiodoned
94364 509141 0 0 3 0x14200 syncer update
4182 18791 0 0 3 0x14200 cleaner cleaner
25683 369622 0 0 3 0x14200 reaper reaper
69374 20730 0 0 3 0x14200 pgdaemon pagedaemon
24845 41843 0 0 3 0x14200 bored crynlk
13311 474656 0 0 3 0x14200 bored crypto
16610 314362 0 0 3 0x14200 bored viomb
38177 462861 0 0 3 0x40014200 acpi0 acpi0
25468 378697 0 0 3 0x40014200 idle1
21756 25469 0 0 3 0x14200 bored softnet
24875 110186 0 0 3 0x14200 bored systqmp
55786 27774 0 0 3 0x14200 bored systq
9218 518078 0 0 3 0x40014200 bored softclock
72794 155600 0 0 3 0x40014200 idle0
1 275794 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 81172 (syz-executor1318) thread 0xffff8000ffff7cf0 (437562)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828b2e60)
#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+0x23a sys/uvm/uvm_fault.c:637
#2 kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:262
#3 kerntrap+0xef sys/arch/amd64/amd64/trap.c:316
#4 alltraps_kern_meltdown+0x7b
#5 copyout+0x53
#6 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline]
#6 syscall+0x5bf sys/arch/amd64/amd64/trap.c:585
#7 Xsyscall+0x128
exclusive rwlock fdlock r = 0 (0xfffffd8078de3258)
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 uvm_fault+0x23a sys/uvm/uvm_fault.c:637
#2 kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:262
#3 kerntrap+0xef sys/arch/amd64/amd64/trap.c:316
#4 alltraps_kern_meltdown+0x7b
#5 copyout+0x53
#6 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline]
#6 syscall+0x5bf sys/arch/amd64/amd64/trap.c:585
#7 Xsyscall+0x128
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 sys_socketpair+0x20f
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#2 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline]
#2 syscall+0x5bf sys/arch/amd64/amd64/trap.c:585
#3 Xsyscall+0x128
ddb{1}> show malloc
#2 syscall+0x5bf sys/arch/amd64/amd64/trap.c:585
#3 Xsyscall+0x128
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10112 6476K 6477K 78643K 11202 0
pcb 13 8K 8K 78643K 13 0
rtable 61 2K 2K 78643K 119 0
ifaddr 29 8K 8K 78643K 30 0
counters 40 33K 33K 78643K 40 0
ioctlops 0 0K 4K 78643K 1467 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 1 0
vnodes 1183 74K 75K 78643K 1221 0
log 0 0K 0K 78643K 1 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 1K 78643K 2 0
UFS mount 5 36K 36K 78643K 5 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 1 0K 0K 78643K 1 0
ACPI 1697 195K 286K 78643K 12598 0
proc 59 63K 71K 78643K 357 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
in_multi 11 0K 0K 78643K 11 0
NFS daemon 1 16K 16K 78643K 1 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 19 95K 95K 78643K 19 0
MSDOSFS mount 1 16K 16K 78643K 1 0
exec 0 0K 2K 78643K 300 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 99 4K 5K 78643K 1834 0
inodedep 1 32K 32K 78643K 1 0
newblk 1 0K 0K 78643K 1 0
VM swap 7 26K 26K 78643K 7 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 4 0K 0K 78643K 4 0
crypto data 1 1K 1K 78643K 1 0
temp 23 3969K 4033K 78643K 1745 0
kqueue 2 2K 2K 78643K 2 0
SYN cache 2 16K 16K 78643K 2 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 120 15 0 13 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtentry 112 23 0 1 1 0 1 1 0 8 0
unpcb 120 163 0 151 1 0 1 1 0 8 0
syncache 296 5 0 5 2 1 1 1 0 8 1
tcpcb 736 8 0 5 1 0 1 1 0 8 0
arp 120 2 0 0 1 0 1 1 0 8 0
inpcb 304 28 0 23 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 9 0 2 1 0 1 1 0 8 0
pfstkey 112 9 0 2 1 0 1 1 0 8 0
pfstate 320 9 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 97 0 0 7 0 7 7 0 8 0
art_table 32 98 0 0 1 0 1 1 0 8 0
art_node 16 22 0 2 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1504 0 115 87 0 87 87 0 8 0
ffsino 272 1504 0 115 93 0 93 93 0 8 0
nchpl 144 1715 0 167 58 0 58 58 0 8 0
uvmvnodes 72 1514 0 0 28 0 28 28 0 8 0
vnodes 224 1514 0 0 90 0 90 90 0 8 0
namei 1024 4052 0 4052 2 1 1 1 0 8 1
percpumem 16 31 0 0 1 0 1 1 0 8 0
scxspl 216 3974 0 3974 11 10 1 8 0 8 1
plimitpl 152 14 0 8 1 0 1 1 0 8 0
sigapl 424 257 0 224 4 0 4 4 0 8 0
futexpl 56 75 0 75 1 0 1 1 0 8 1
knotepl 112 5 0 0 1 0 1 1 0 8 0
kqueuepl 168 1 0 0 1 0 1 1 0 8 0
pipepl 336 64 0 60 2 1 1 1 0 8 0
fdescpl 496 241 0 224 3 0 3 3 0 8 0
filepl 152 1091 0 1041 2 0 2 2 0 8 0
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 9 1 0 1 1 0 8 0
pgrppl 48 18 0 9 1 0 1 1 0 8 0
ucredpl 96 62 0 53 1 0 1 1 0 8 0
zombiepl 144 224 0 224 2 1 1 1 0 8 1
processpl 1080 257 0 224 3 0 3 3 0 8 0
procpl 672 296 0 259 4 0 4 4 0 8 0
sockpl 480 206 0 187 4 1 3 3 0 8 0
mcl8k 8192 3 0 0 1 0 1 1 0 8 0
mcl2k 2048 82 0 0 11 0 11 11 0 8 0
mtagpl 96 1 0 0 1 0 1 1 0 8 0
mbufpl 256 127 0 0 7 0 7 7 0 8 0
bufpl 280 2056 0 90 141 0 141 141 0 8 0
anonpl 24 35780 0 33232 18 2 16 16 0 186 0
amapchunkpl 152 3504 0 3322 9 1 8 8 0 158 1
amappl16 200 66 0 62 1 0 1 1 0 8 0
amappl15 192 51 0 46 1 0 1 1 0 8 0
amappl13 176 14 0 13 2 1 1 1 0 8 0
amappl12 168 27 0 24 1 0 1 1 0 8 0
amappl11 160 44 0 32 1 0 1 1 0 8 0
amappl10 152 6 0 2 1 0 1 1 0 8 0
amappl9 144 241 0 241 3 2 1 1 0 8 1
amappl8 136 240 0 235 1 0 1 1 0 8 0
amappl7 128 36 0 32 1 0 1 1 0 8 0
amappl6 120 82 0 73 1 0 1 1 0 8 0
amappl5 112 137 0 127 1 0 1 1 0 8 0
amappl4 104 504 0 482 1 0 1 1 0 8 0
amappl3 96 68 0 62 1 0 1 1 0 8 0
amappl2 88 345 0 306 1 0 1 1 0 8 0
amappl1 80 7038 0 6644 12 3 9 9 0 8 0
amappl 88 1628 0 1548 2 0 2 2 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
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
uaddrrnd 24 241 0 224 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 241 0 224 1 0 1 1 0 8 0
vmmpekpl 168 5592 0 5575 1 0 1 1 0 8 0
vmmpepl 168 21769 0 20802 46 3 43 43 0 357 0
vmsppl 368 240 0 224 2 0 2 2 0 8 0
rwobjpl 56 6618 0 6085 10 2 8 8 0 8 0
pdppl 4096 489 0 448 59 18 41 41 0 8 0
pvpl 32 107277 0 102784 44 7 37 37 0 265 0
pmappl 232 240 0 224 1 0 1 1 0 8 0
extentpl 40 58 0 40 1 0 1 1 0 8 0
phpool 112 281 0 23 8 0 8 8 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
ddb{0}> trace
x86_ipi_db(ffffffff8270cff0) 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(ffffffff828b2c58) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
__mp_lock(ffffffff828b2c58) at __mp_lock+0x122 sys/kern/kern_lock.c:147
softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90
Xsoftclock() at Xsoftclock+0x1f
end of kernel
end trace frame: 0x7f7ffffe8bd0, count: -6
ddb{0}> machine ddbcpu 1
Stopped at db_enter+0x18: addq $0x8,%rsp
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
witness_checkorder(fffffd806d6f13d8,9,0) at witness_checkorder+0x108b
rw_enter(fffffd806d6f13c8,81) at rw_enter+0xd4
rrw_enter(fffffd806d6f13c8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461
VOP_LOCK(fffffd8078819ea0,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614
vn_lock(fffffd8078819ea0,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579
uvn_get(fffffd806ce810f0,0,ffff80002126ec08,ffff80002126ebd8,0,2) at uvn_get+0x276 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline]
uvn_get(fffffd806ce810f0,0,ffff80002126ec08,ffff80002126ebd8,0,2) at uvn_get+0x276 sys/uvm/uvm_vnode.c:993
uvm_fault_lower(ffff80002126ed70,ffff80002126eda8,ffff80002126ecf0,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251
uvm_fault(fffffd807f00aa10,20000000,0,2) at uvm_fault+0x256 sys/uvm/uvm_fault.c:638
kpageflttrap(ffff80002126ef00,20000040) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:262
kerntrap(ffff80002126ef00) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:316
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
copyout() at copyout+0x53
syscall(ffff80002126f130) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline]
copyout() at copyout+0x53
syscall(ffff80002126f130) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x2229aa33480, count: -15
end of kernel
ddb{1}>
Anton Lindqvist
Feb 22, 2022, 1:44:30 PM2/22/22
to syzbot, syzkaller-o...@googlegroups.com
It's been over 9 months since the last this got triggered. No luck with
reproducer either.
#syz invalid
reproducer either.
#syz invalid
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