witness: reversal: netlock vmmaplk
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syzbot
Mar 12, 2022, 7:39:22 AM3/12/22
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: d895c343d40b Constify struct cfattach, not struct cfdriver
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=113e37e9700000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=010c0e486d07047d0e85
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+010c0e...@syzkaller.appspotmail.com
login: witness: lock order reversal:
1st 0xffffffff8290fe50 netlock (netlock)
2nd 0xfffffd8068e08bb0 vmmaplk (&map->lock)
lock order "&map->lock"(rwlock) -> "netlock"(rwlock) first seen at:
#0 rw_enter_write+0x5b sys/kern/kern_rwlock.c:128
#1 udp_sysctl+0x8a sys/netinet/udp_usrreq.c:1269
#2 sys_sysctl+0x209 sys/kern/kern_sysctl.c:249
#3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#4 Xsyscall+0x128
lock order "netlock"(rwlock) -> "&map->lock"(rwlock) first seen at:
#0 rw_enter_read+0x66 sys/kern/kern_rwlock.c:112
#1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758
#2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674
#3 uvm_fault+0x102 sys/uvm/uvm_fault.c:602
#4 kpageflttrap+0x209
#5 kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
#6 alltraps_kern_meltdown+0x7b
#7 copyout+0x53
#8 soo_ioctl+0x26c
#9 sys_ioctl+0x4a2
#10 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#10 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#11 Xsyscall+0x128
Stopped at db_enter+0x18: addq $0x8,%rsp
ddb{1}>
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:440
witness_checkorder(fffffd8068e08bb0,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline]
witness_checkorder(fffffd8068e08bb0,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105
rw_enter_read(fffffd8068e08ba0) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112
uvmfault_lookup(ffff80002c95d610,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758
uvm_fault_check(ffff80002c95d610,ffff80002c95d648,ffff80002c95d670) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674
uvm_fault(fffffd8068e08b98,20ff9000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602
kpageflttrap(ffff80002c95d7a0,20ff9000) at kpageflttrap+0x209
kerntrap(ffff80002c95d7a0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
copyout() at copyout+0x53
soo_ioctl(fffffd80759ad448,c028698d,ffff80002c95d9c0,ffff80002385b270) at soo_ioctl+0x26c
sys_ioctl(ffff80002385b270,ffff80002c95dad8,ffff80002c95db30) at sys_ioctl+0x4a2
syscall(ffff80002c95dba0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff80002c95dba0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xbb9a8d10490, count: -14
ddb{1}> show registers
rdi 0x3
rsi 0x40000 acpi_pdirpa+0x2be68
rbp 0xffff80002c95d300
rbx 0x3
rdx 0xffff800000bc7100
rcx 0
rax 0x3ffff acpi_pdirpa+0x2be67
r8 0xffff80002c95d270
r9 0x8080808080808080
r10 0x9de35bf423531c3b
r11 0x87f3a6ed5c376ed0
r12 0xffffffff82ab04e0 w_lodata+0x52b70
r13 0
r14 0xffffffff82aa8030 w_lodata+0x4a6c0
r15 0xfffffd8002f62d80
rip 0xffffffff8138d658 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff80002c95d2f0
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.4) pid=370363 stat=onproc
flags process=10<SUGID> proc=4000000<THREAD>
pri=32, usrpri=76, nice=20
forw=0xffffffffffffffff, list=0xffff80002385ad30,0xffff80002385a2c0
process=0xffff800028d1d4e8 user=0xffff80002c958000, vmspace=0xfffffd8068e08b98
estcpu=36, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
7485 79362 603 32767 2 0x10 syz-executor.0
7485 53407 603 32767 3 0x4000090 fsleep syz-executor.0
88366 100426 1711 32767 2 0x10 syz-executor.3
88366 511 1711 32767 2 0x4000010 syz-executor.3
67595 33375 39940 32767 2 0x10 syz-executor.5
73514 132793 5043 32767 2 0x10 syz-executor.6
73514 523911 5043 32767 2 0x4000010 syz-executor.6
41508 45346 36173 32767 2 0x10 syz-executor.4
*41508 370363 36173 32767 7 0x4000010 syz-executor.4
14368 45421 9191 32767 2 0x10 syz-executor.7
14368 89497 9191 32767 3 0x4000090 ttyin syz-executor.7
60906 427559 0 0 3 0x14200 bored sosplice
9191 65218 12320 32767 2 0x10 syz-executor.7
39940 108461 93799 32767 3 0x90 nanoslp syz-executor.5
5043 239563 27818 32767 3 0x90 nanoslp syz-executor.6
27818 477612 53032 0 3 0x82 wait syz-executor.6
36173 421884 42840 32767 3 0x90 nanoslp syz-executor.4
93799 26443 53032 0 3 0x82 wait syz-executor.5
12320 444672 53032 0 3 0x82 wait syz-executor.7
42840 214032 53032 0 3 0x82 wait syz-executor.4
1711 352590 73668 32767 3 0x90 nanoslp syz-executor.3
73668 443037 53032 0 3 0x82 wait syz-executor.3
82192 369482 62901 32767 3 0x90 nanoslp syz-executor.2
40749 234084 49408 32767 3 0x90 nanoslp syz-executor.1
62901 373971 53032 0 3 0x82 wait syz-executor.2
603 310561 29618 32767 3 0x90 nanoslp syz-executor.0
49408 116433 53032 0 3 0x82 wait syz-executor.1
29618 301625 53032 0 3 0x82 wait syz-executor.0
53032 201895 54919 0 3 0x82 kqread syz-fuzzer
53032 214840 54919 0 3 0x4000082 thrsleep syz-fuzzer
53032 304394 54919 0 3 0x4000082 thrsleep syz-fuzzer
53032 106898 54919 0 3 0x4000082 thrsleep syz-fuzzer
53032 247590 54919 0 3 0x4000082 thrsleep syz-fuzzer
53032 334146 54919 0 3 0x4000082 thrsleep syz-fuzzer
53032 66068 54919 0 3 0x4000082 thrsleep syz-fuzzer
53032 140426 54919 0 3 0x4000082 thrsleep syz-fuzzer
54919 398684 19696 0 3 0x10008a sigsusp ksh
19696 304831 30794 0 3 0x9a kqread sshd
75558 48927 1 0 3 0x100083 ttyin getty
30794 520934 1 0 3 0x88 kqread sshd
47731 154870 54167 73 3 0x1100090 kqread syslogd
54167 132605 1 0 3 0x100082 netio syslogd
94688 92017 1 0 3 0x100080 kqread resolvd
24676 263148 4538 77 3 0x100092 kqread dhcpleased
48737 187184 4538 77 3 0x100092 kqread dhcpleased
4538 328716 1 0 3 0x80 kqread dhcpleased
71374 109184 0 0 3 0x14200 bored smr
49964 511708 0 0 2 0x14200 zerothread
57365 477421 0 0 3 0x14200 aiodoned aiodoned
17500 33767 0 0 3 0x14200 syncer update
89998 59106 0 0 3 0x14200 cleaner cleaner
50209 56852 0 0 7 0x14200 reaper
26972 381467 0 0 3 0x14200 pgdaemon pagedaemon
23761 96226 0 0 3 0x14200 bored viomb
99072 396448 0 0 3 0x40014200 acpi0 acpi0
43926 343359 0 0 3 0x40014200 idle1
9283 260446 0 0 3 0x14200 bored softnet
36457 33732 0 0 3 0x14200 bored systqmp
24699 231657 0 0 3 0x14200 bored systq
46497 255213 0 0 2 0x40014200 softclock
7401 275711 0 0 3 0x40014200 idle0
1 189577 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 41508 (syz-executor.4) thread 0xffff80002385b270 (370363)
shared rwlock netlock r = 0 (0xffffffff8290fe50)
#0 witness_lock+0x44d
#1 ifioctl_get+0x81 if_getgrouplist sys/net/if.c:2911 [inline]
#1 ifioctl_get+0x81 sys/net/if.c:2337
#2 soo_ioctl+0x26c
#3 sys_ioctl+0x4a2
#4 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#4 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#5 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829de988)
#0 witness_lock+0x44d
#1 soo_ioctl+0x25a sys/kern/sys_socket.c:136
#2 sys_ioctl+0x4a2
#3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#4 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10176 6407K 6419K 78643K 11266 0
pcb 13 8K 8K 78643K 13 0
rtable 242 7K 7K 78643K 384 0
ifaddr 81 16K 16K 78643K 82 0
counters 56 35K 35K 78643K 56 0
ioctlops 0 0K 2K 78643K 37 0
iov 0 0K 4K 78643K 7 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 5 0
vnodes 1270 79K 79K 78643K 1307 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 12 0K 0K 78643K 205 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12548 0
file desc 24 89K 121K 78643K 999 0
proc 56 74K 111K 78643K 483 0
subproc 104 6K 6K 78643K 104 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 115 0
in_multi 99 6K 7K 78643K 173 0
ether_multi 1 0K 0K 78643K 16 0
mrt 2 0K 0K 78643K 2 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 73 334K 334K 78643K 73 0
exec 0 0K 2K 78643K 613 0
tdb 3 0K 0K 78643K 3 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 296 79K 81K 78643K 13231 0
UVM aobj 3 2K 2K 78643K 3 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 132 0
NDP 11 0K 2K 78643K 27 0
temp 125 4703K 4767K 78643K 5955 0
kqueue 12 18K 26K 78643K 111 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 22 0 0 1 0 1 1 0 8 0
rtpcb 120 116 0 113 1 0 1 1 0 8 0
rtentry 112 114 0 2 4 0 4 4 0 8 0
unpcb 136 405 0 391 2 1 1 2 0 8 0
syncache 296 16 0 16 2 1 1 1 0 8 1
tcpqe 32 42 0 42 2 1 1 1 0 8 1
tcpcb 736 412 0 403 11 3 8 8 0 8 5
arp 120 19 0 0 1 0 1 1 0 8 0
inpcb 304 685 0 672 3 1 2 2 0 8 0
nd6 48 26 0 1 1 0 1 1 0 8 0
kcovpl 48 8 0 0 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 457 0 1 29 0 29 29 0 8 0
art_table 32 458 0 1 4 0 4 4 0 8 0
art_node 16 113 0 11 1 0 1 1 0 8 0
sysvmsgpl 40 58 0 42 1 0 1 1 0 8 0
semupl 112 1 0 1 1 1 0 1 0 8 0
semapl 112 202 0 192 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 2473 0 1045 90 0 90 90 0 8 0
ffsino 272 2473 0 1045 96 0 96 96 0 8 0
nchpl 144 3942 0 2281 63 0 63 63 0 8 0
uvmvnodes 80 2586 0 0 53 0 53 53 0 8 0
vnodes 224 2586 0 0 153 0 153 153 0 8 0
namei 1024 10807 0 10807 2 1 1 2 0 8 1
percpumem 16 40 0 0 1 0 1 1 0 8 0
scxspl 216 12204 0 12204 9 8 1 8 0 8 1
plimitpl 152 92 0 68 2 0 2 2 0 8 1
sigapl 424 1276 0 1224 7 1 6 7 0 8 0
futexpl 64 8268 0 8267 1 0 1 1 0 8 0
knotepl 120 108 0 0 4 0 4 4 0 8 0
kqueuepl 216 187 0 179 1 0 1 1 0 8 0
pipepl 336 165 0 137 3 0 3 3 0 8 0
fdescpl 496 1261 0 1226 7 2 5 6 0 8 0
filepl 152 4563 0 4326 10 0 10 10 0 8 0
lockfpl 104 48 0 46 1 0 1 1 0 8 0
lockfspl 48 22 0 20 1 0 1 1 0 8 0
sessionpl 144 23 0 7 1 0 1 1 0 8 0
pgrppl 48 23 0 7 1 0 1 1 0 8 0
ucredpl 96 640 0 622 1 0 1 1 0 8 0
zombiepl 144 1226 0 1224 1 0 1 1 0 8 0
processpl 1064 1276 0 1224 5 1 4 4 0 8 0
procpl 672 2294 0 2229 6 0 6 6 0 8 0
sosppl 168 81 0 81 1 0 1 1 0 8 1
sockpl 480 1210 0 1181 8 3 5 6 0 8 0
mcl64k 65536 5 0 0 1 0 1 1 0 8 0
mcl16k 16384 5 0 0 1 0 1 1 0 8 0
mcl12k 12288 2 0 0 1 0 1 1 0 8 0
mcl9k 9216 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 12 0 0 2 0 2 2 0 8 0
mcl4k 4096 14 0 0 2 0 2 2 0 8 0
mcl2k 2048 137 0 0 16 0 16 16 0 8 0
mtagpl 96 3 0 0 1 0 1 1 0 8 0
mbufpl 256 437 0 0 26 0 26 26 0 8 0
bufpl 288 5078 0 139 353 0 353 353 0 8 0
anonpl 24 293269 0 285439 80 7 73 77 0 186 19
amapchunkpl 152 31220 0 30599 40 6 34 38 0 158 7
amappl16 200 2099 0 1942 11 2 9 10 0 8 0
amappl15 192 302 0 297 1 0 1 1 0 8 0
amappl14 184 231 0 225 1 0 1 1 0 8 0
amappl13 176 208 0 203 1 0 1 1 0 8 0
amappl12 168 250 0 243 1 0 1 1 0 8 0
amappl11 160 160 0 147 1 0 1 1 0 8 0
amappl10 152 36 0 33 1 0 1 1 0 8 0
amappl9 144 473 0 470 1 0 1 1 0 8 0
amappl8 136 684 0 626 3 0 3 3 0 8 0
amappl7 128 220 0 208 1 0 1 1 0 8 0
amappl6 120 191 0 173 2 1 1 2 0 8 0
amappl5 112 738 0 718 1 0 1 1 0 8 0
amappl4 104 1030 0 998 2 0 2 2 0 8 0
amappl3 96 518 0 498 1 0 1 1 0 8 0
amappl2 88 786 0 739 3 1 2 3 0 8 0
amappl1 80 24449 0 23821 18 3 15 18 0 8 0
amappl 88 12783 0 12555 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 72 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 1261 0 1226 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 1261 0 1226 1 0 1 1 0 8 0
vmmpekpl 168 12175 0 12122 3 0 3 3 0 8 0
vmmpepl 168 112258 0 109892 114 2 112 112 0 357 2
vmsppl 368 1260 0 1225 4 0 4 4 0 8 0
rwobjpl 56 28997 0 25344 52 0 52 52 0 8 0
pdppl 4096 2529 0 2450 109 28 81 93 0 8 2
pvpl 32 650278 0 637387 261 24 237 260 0 265 122
pmappl 248 1260 0 1225 4 1 3 3 0 8 0
extentpl 40 58 0 38 1 0 1 1 0 8 0
phpool 112 752 0 34 21 0 21 21 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
ddb{0}> trace
x86_ipi_db(ffffffff829baff0) 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(ffffffff829de780) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff829de780) at __mp_lock+0x122 sys/kern/kern_lock.c:147
intr_handler(ffff800021134d00,ffff800000077500) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532
Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2f kd_curproc sys/dev/kcov.c:578 [inline]
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2f sys/dev/kcov.c:148
__mp_lock(ffffffff829de780) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff829de780) at __mp_lock+0x133 sys/kern/kern_lock.c:147
softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:88
Xsoftclock() at Xsoftclock+0x1f
__mp_lock(ffffffff829de780) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff829de780) at __mp_lock+0x122 sys/kern/kern_lock.c:147
uvm_unmap_detach(ffff800021134fd0,1) at uvm_unmap_detach+0x113 sys/uvm/uvm_map.c:1615
uvm_map_teardown(fffffd8068e085d8) at uvm_map_teardown+0x262 sys/uvm/uvm_map.c:2789
uvmspace_free(fffffd8068e085d8) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3685
reaper(ffff8000210f9260) at reaper+0x18b sys/kern/kern_exit.c:457
end trace frame: 0x0, count: -15
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:440
witness_checkorder(fffffd8068e08bb0,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline]
witness_checkorder(fffffd8068e08bb0,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105
rw_enter_read(fffffd8068e08ba0) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112
uvmfault_lookup(ffff80002c95d610,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758
uvm_fault_check(ffff80002c95d610,ffff80002c95d648,ffff80002c95d670) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674
uvm_fault(fffffd8068e08b98,20ff9000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602
kpageflttrap(ffff80002c95d7a0,20ff9000) at kpageflttrap+0x209
kerntrap(ffff80002c95d7a0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
copyout() at copyout+0x53
soo_ioctl(fffffd80759ad448,c028698d,ffff80002c95d9c0,ffff80002385b270) at soo_ioctl+0x26c
sys_ioctl(ffff80002385b270,ffff80002c95dad8,ffff80002c95db30) at sys_ioctl+0x4a2
syscall(ffff80002c95dba0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff80002c95dba0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xbb9a8d10490, count: -14
---
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: d895c343d40b Constify struct cfattach, not struct cfdriver
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=113e37e9700000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=010c0e486d07047d0e85
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+010c0e...@syzkaller.appspotmail.com
login: witness: lock order reversal:
1st 0xffffffff8290fe50 netlock (netlock)
2nd 0xfffffd8068e08bb0 vmmaplk (&map->lock)
lock order "&map->lock"(rwlock) -> "netlock"(rwlock) first seen at:
#0 rw_enter_write+0x5b sys/kern/kern_rwlock.c:128
#1 udp_sysctl+0x8a sys/netinet/udp_usrreq.c:1269
#2 sys_sysctl+0x209 sys/kern/kern_sysctl.c:249
#3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#4 Xsyscall+0x128
lock order "netlock"(rwlock) -> "&map->lock"(rwlock) first seen at:
#0 rw_enter_read+0x66 sys/kern/kern_rwlock.c:112
#1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758
#2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674
#3 uvm_fault+0x102 sys/uvm/uvm_fault.c:602
#4 kpageflttrap+0x209
#5 kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
#6 alltraps_kern_meltdown+0x7b
#7 copyout+0x53
#8 soo_ioctl+0x26c
#9 sys_ioctl+0x4a2
#10 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#10 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#11 Xsyscall+0x128
Stopped at db_enter+0x18: addq $0x8,%rsp
ddb{1}>
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:440
witness_checkorder(fffffd8068e08bb0,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline]
witness_checkorder(fffffd8068e08bb0,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105
rw_enter_read(fffffd8068e08ba0) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112
uvmfault_lookup(ffff80002c95d610,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758
uvm_fault_check(ffff80002c95d610,ffff80002c95d648,ffff80002c95d670) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674
uvm_fault(fffffd8068e08b98,20ff9000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602
kpageflttrap(ffff80002c95d7a0,20ff9000) at kpageflttrap+0x209
kerntrap(ffff80002c95d7a0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
copyout() at copyout+0x53
soo_ioctl(fffffd80759ad448,c028698d,ffff80002c95d9c0,ffff80002385b270) at soo_ioctl+0x26c
sys_ioctl(ffff80002385b270,ffff80002c95dad8,ffff80002c95db30) at sys_ioctl+0x4a2
syscall(ffff80002c95dba0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff80002c95dba0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xbb9a8d10490, count: -14
ddb{1}> show registers
rdi 0x3
rsi 0x40000 acpi_pdirpa+0x2be68
rbp 0xffff80002c95d300
rbx 0x3
rdx 0xffff800000bc7100
rcx 0
rax 0x3ffff acpi_pdirpa+0x2be67
r8 0xffff80002c95d270
r9 0x8080808080808080
r10 0x9de35bf423531c3b
r11 0x87f3a6ed5c376ed0
r12 0xffffffff82ab04e0 w_lodata+0x52b70
r13 0
r14 0xffffffff82aa8030 w_lodata+0x4a6c0
r15 0xfffffd8002f62d80
rip 0xffffffff8138d658 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff80002c95d2f0
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.4) pid=370363 stat=onproc
flags process=10<SUGID> proc=4000000<THREAD>
pri=32, usrpri=76, nice=20
forw=0xffffffffffffffff, list=0xffff80002385ad30,0xffff80002385a2c0
process=0xffff800028d1d4e8 user=0xffff80002c958000, vmspace=0xfffffd8068e08b98
estcpu=36, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
7485 79362 603 32767 2 0x10 syz-executor.0
7485 53407 603 32767 3 0x4000090 fsleep syz-executor.0
88366 100426 1711 32767 2 0x10 syz-executor.3
88366 511 1711 32767 2 0x4000010 syz-executor.3
67595 33375 39940 32767 2 0x10 syz-executor.5
73514 132793 5043 32767 2 0x10 syz-executor.6
73514 523911 5043 32767 2 0x4000010 syz-executor.6
41508 45346 36173 32767 2 0x10 syz-executor.4
*41508 370363 36173 32767 7 0x4000010 syz-executor.4
14368 45421 9191 32767 2 0x10 syz-executor.7
14368 89497 9191 32767 3 0x4000090 ttyin syz-executor.7
60906 427559 0 0 3 0x14200 bored sosplice
9191 65218 12320 32767 2 0x10 syz-executor.7
39940 108461 93799 32767 3 0x90 nanoslp syz-executor.5
5043 239563 27818 32767 3 0x90 nanoslp syz-executor.6
27818 477612 53032 0 3 0x82 wait syz-executor.6
36173 421884 42840 32767 3 0x90 nanoslp syz-executor.4
93799 26443 53032 0 3 0x82 wait syz-executor.5
12320 444672 53032 0 3 0x82 wait syz-executor.7
42840 214032 53032 0 3 0x82 wait syz-executor.4
1711 352590 73668 32767 3 0x90 nanoslp syz-executor.3
73668 443037 53032 0 3 0x82 wait syz-executor.3
82192 369482 62901 32767 3 0x90 nanoslp syz-executor.2
40749 234084 49408 32767 3 0x90 nanoslp syz-executor.1
62901 373971 53032 0 3 0x82 wait syz-executor.2
603 310561 29618 32767 3 0x90 nanoslp syz-executor.0
49408 116433 53032 0 3 0x82 wait syz-executor.1
29618 301625 53032 0 3 0x82 wait syz-executor.0
53032 201895 54919 0 3 0x82 kqread syz-fuzzer
53032 214840 54919 0 3 0x4000082 thrsleep syz-fuzzer
53032 304394 54919 0 3 0x4000082 thrsleep syz-fuzzer
53032 106898 54919 0 3 0x4000082 thrsleep syz-fuzzer
53032 247590 54919 0 3 0x4000082 thrsleep syz-fuzzer
53032 334146 54919 0 3 0x4000082 thrsleep syz-fuzzer
53032 66068 54919 0 3 0x4000082 thrsleep syz-fuzzer
53032 140426 54919 0 3 0x4000082 thrsleep syz-fuzzer
54919 398684 19696 0 3 0x10008a sigsusp ksh
19696 304831 30794 0 3 0x9a kqread sshd
75558 48927 1 0 3 0x100083 ttyin getty
30794 520934 1 0 3 0x88 kqread sshd
47731 154870 54167 73 3 0x1100090 kqread syslogd
54167 132605 1 0 3 0x100082 netio syslogd
94688 92017 1 0 3 0x100080 kqread resolvd
24676 263148 4538 77 3 0x100092 kqread dhcpleased
48737 187184 4538 77 3 0x100092 kqread dhcpleased
4538 328716 1 0 3 0x80 kqread dhcpleased
71374 109184 0 0 3 0x14200 bored smr
49964 511708 0 0 2 0x14200 zerothread
57365 477421 0 0 3 0x14200 aiodoned aiodoned
17500 33767 0 0 3 0x14200 syncer update
89998 59106 0 0 3 0x14200 cleaner cleaner
50209 56852 0 0 7 0x14200 reaper
26972 381467 0 0 3 0x14200 pgdaemon pagedaemon
23761 96226 0 0 3 0x14200 bored viomb
99072 396448 0 0 3 0x40014200 acpi0 acpi0
43926 343359 0 0 3 0x40014200 idle1
9283 260446 0 0 3 0x14200 bored softnet
36457 33732 0 0 3 0x14200 bored systqmp
24699 231657 0 0 3 0x14200 bored systq
46497 255213 0 0 2 0x40014200 softclock
7401 275711 0 0 3 0x40014200 idle0
1 189577 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 41508 (syz-executor.4) thread 0xffff80002385b270 (370363)
shared rwlock netlock r = 0 (0xffffffff8290fe50)
#0 witness_lock+0x44d
#1 ifioctl_get+0x81 if_getgrouplist sys/net/if.c:2911 [inline]
#1 ifioctl_get+0x81 sys/net/if.c:2337
#2 soo_ioctl+0x26c
#3 sys_ioctl+0x4a2
#4 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#4 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#5 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829de988)
#0 witness_lock+0x44d
#1 soo_ioctl+0x25a sys/kern/sys_socket.c:136
#2 sys_ioctl+0x4a2
#3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#4 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10176 6407K 6419K 78643K 11266 0
pcb 13 8K 8K 78643K 13 0
rtable 242 7K 7K 78643K 384 0
ifaddr 81 16K 16K 78643K 82 0
counters 56 35K 35K 78643K 56 0
ioctlops 0 0K 2K 78643K 37 0
iov 0 0K 4K 78643K 7 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 5 0
vnodes 1270 79K 79K 78643K 1307 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 12 0K 0K 78643K 205 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12548 0
file desc 24 89K 121K 78643K 999 0
proc 56 74K 111K 78643K 483 0
subproc 104 6K 6K 78643K 104 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 115 0
in_multi 99 6K 7K 78643K 173 0
ether_multi 1 0K 0K 78643K 16 0
mrt 2 0K 0K 78643K 2 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 73 334K 334K 78643K 73 0
exec 0 0K 2K 78643K 613 0
tdb 3 0K 0K 78643K 3 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 296 79K 81K 78643K 13231 0
UVM aobj 3 2K 2K 78643K 3 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 132 0
NDP 11 0K 2K 78643K 27 0
temp 125 4703K 4767K 78643K 5955 0
kqueue 12 18K 26K 78643K 111 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 22 0 0 1 0 1 1 0 8 0
rtpcb 120 116 0 113 1 0 1 1 0 8 0
rtentry 112 114 0 2 4 0 4 4 0 8 0
unpcb 136 405 0 391 2 1 1 2 0 8 0
syncache 296 16 0 16 2 1 1 1 0 8 1
tcpqe 32 42 0 42 2 1 1 1 0 8 1
tcpcb 736 412 0 403 11 3 8 8 0 8 5
arp 120 19 0 0 1 0 1 1 0 8 0
inpcb 304 685 0 672 3 1 2 2 0 8 0
nd6 48 26 0 1 1 0 1 1 0 8 0
kcovpl 48 8 0 0 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 457 0 1 29 0 29 29 0 8 0
art_table 32 458 0 1 4 0 4 4 0 8 0
art_node 16 113 0 11 1 0 1 1 0 8 0
sysvmsgpl 40 58 0 42 1 0 1 1 0 8 0
semupl 112 1 0 1 1 1 0 1 0 8 0
semapl 112 202 0 192 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 2473 0 1045 90 0 90 90 0 8 0
ffsino 272 2473 0 1045 96 0 96 96 0 8 0
nchpl 144 3942 0 2281 63 0 63 63 0 8 0
uvmvnodes 80 2586 0 0 53 0 53 53 0 8 0
vnodes 224 2586 0 0 153 0 153 153 0 8 0
namei 1024 10807 0 10807 2 1 1 2 0 8 1
percpumem 16 40 0 0 1 0 1 1 0 8 0
scxspl 216 12204 0 12204 9 8 1 8 0 8 1
plimitpl 152 92 0 68 2 0 2 2 0 8 1
sigapl 424 1276 0 1224 7 1 6 7 0 8 0
futexpl 64 8268 0 8267 1 0 1 1 0 8 0
knotepl 120 108 0 0 4 0 4 4 0 8 0
kqueuepl 216 187 0 179 1 0 1 1 0 8 0
pipepl 336 165 0 137 3 0 3 3 0 8 0
fdescpl 496 1261 0 1226 7 2 5 6 0 8 0
filepl 152 4563 0 4326 10 0 10 10 0 8 0
lockfpl 104 48 0 46 1 0 1 1 0 8 0
lockfspl 48 22 0 20 1 0 1 1 0 8 0
sessionpl 144 23 0 7 1 0 1 1 0 8 0
pgrppl 48 23 0 7 1 0 1 1 0 8 0
ucredpl 96 640 0 622 1 0 1 1 0 8 0
zombiepl 144 1226 0 1224 1 0 1 1 0 8 0
processpl 1064 1276 0 1224 5 1 4 4 0 8 0
procpl 672 2294 0 2229 6 0 6 6 0 8 0
sosppl 168 81 0 81 1 0 1 1 0 8 1
sockpl 480 1210 0 1181 8 3 5 6 0 8 0
mcl64k 65536 5 0 0 1 0 1 1 0 8 0
mcl16k 16384 5 0 0 1 0 1 1 0 8 0
mcl12k 12288 2 0 0 1 0 1 1 0 8 0
mcl9k 9216 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 12 0 0 2 0 2 2 0 8 0
mcl4k 4096 14 0 0 2 0 2 2 0 8 0
mcl2k 2048 137 0 0 16 0 16 16 0 8 0
mtagpl 96 3 0 0 1 0 1 1 0 8 0
mbufpl 256 437 0 0 26 0 26 26 0 8 0
bufpl 288 5078 0 139 353 0 353 353 0 8 0
anonpl 24 293269 0 285439 80 7 73 77 0 186 19
amapchunkpl 152 31220 0 30599 40 6 34 38 0 158 7
amappl16 200 2099 0 1942 11 2 9 10 0 8 0
amappl15 192 302 0 297 1 0 1 1 0 8 0
amappl14 184 231 0 225 1 0 1 1 0 8 0
amappl13 176 208 0 203 1 0 1 1 0 8 0
amappl12 168 250 0 243 1 0 1 1 0 8 0
amappl11 160 160 0 147 1 0 1 1 0 8 0
amappl10 152 36 0 33 1 0 1 1 0 8 0
amappl9 144 473 0 470 1 0 1 1 0 8 0
amappl8 136 684 0 626 3 0 3 3 0 8 0
amappl7 128 220 0 208 1 0 1 1 0 8 0
amappl6 120 191 0 173 2 1 1 2 0 8 0
amappl5 112 738 0 718 1 0 1 1 0 8 0
amappl4 104 1030 0 998 2 0 2 2 0 8 0
amappl3 96 518 0 498 1 0 1 1 0 8 0
amappl2 88 786 0 739 3 1 2 3 0 8 0
amappl1 80 24449 0 23821 18 3 15 18 0 8 0
amappl 88 12783 0 12555 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 72 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 1261 0 1226 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 1261 0 1226 1 0 1 1 0 8 0
vmmpekpl 168 12175 0 12122 3 0 3 3 0 8 0
vmmpepl 168 112258 0 109892 114 2 112 112 0 357 2
vmsppl 368 1260 0 1225 4 0 4 4 0 8 0
rwobjpl 56 28997 0 25344 52 0 52 52 0 8 0
pdppl 4096 2529 0 2450 109 28 81 93 0 8 2
pvpl 32 650278 0 637387 261 24 237 260 0 265 122
pmappl 248 1260 0 1225 4 1 3 3 0 8 0
extentpl 40 58 0 38 1 0 1 1 0 8 0
phpool 112 752 0 34 21 0 21 21 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
ddb{0}> trace
x86_ipi_db(ffffffff829baff0) 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(ffffffff829de780) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff829de780) at __mp_lock+0x122 sys/kern/kern_lock.c:147
intr_handler(ffff800021134d00,ffff800000077500) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532
Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2f kd_curproc sys/dev/kcov.c:578 [inline]
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2f sys/dev/kcov.c:148
__mp_lock(ffffffff829de780) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff829de780) at __mp_lock+0x133 sys/kern/kern_lock.c:147
softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:88
Xsoftclock() at Xsoftclock+0x1f
__mp_lock(ffffffff829de780) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff829de780) at __mp_lock+0x122 sys/kern/kern_lock.c:147
uvm_unmap_detach(ffff800021134fd0,1) at uvm_unmap_detach+0x113 sys/uvm/uvm_map.c:1615
uvm_map_teardown(fffffd8068e085d8) at uvm_map_teardown+0x262 sys/uvm/uvm_map.c:2789
uvmspace_free(fffffd8068e085d8) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3685
reaper(ffff8000210f9260) at reaper+0x18b sys/kern/kern_exit.c:457
end trace frame: 0x0, count: -15
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:440
witness_checkorder(fffffd8068e08bb0,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline]
witness_checkorder(fffffd8068e08bb0,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105
rw_enter_read(fffffd8068e08ba0) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112
uvmfault_lookup(ffff80002c95d610,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758
uvm_fault_check(ffff80002c95d610,ffff80002c95d648,ffff80002c95d670) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674
uvm_fault(fffffd8068e08b98,20ff9000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602
kpageflttrap(ffff80002c95d7a0,20ff9000) at kpageflttrap+0x209
kerntrap(ffff80002c95d7a0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
copyout() at copyout+0x53
soo_ioctl(fffffd80759ad448,c028698d,ffff80002c95d9c0,ffff80002385b270) at soo_ioctl+0x26c
sys_ioctl(ffff80002385b270,ffff80002c95dad8,ffff80002c95db30) at sys_ioctl+0x4a2
syscall(ffff80002c95dba0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff80002c95dba0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xbb9a8d10490, count: -14
---
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
Mar 12, 2022, 8:12:26 AM3/12/22
to syzkaller-o...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: d895c343d40b Constify struct cfattach, not struct cfdriver
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=110c5503700000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=105755b5700000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+010c0e...@syzkaller.appspotmail.com
login: witness: lock order reversal:
1st 0xffffffff8290fe50 netlock (netlock)
2nd 0xfffffd800872e188 vmmaplk (&map->lock)
#9 soo_ioctl+0x26c
#10 fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:307
#11 VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264
#12 vn_ioctl+0xbc sys/kern/vfs_vnops.c:531
#13 sys_ioctl+0x4a2
#14 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#14 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#15 Xsyscall+0x128
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
witness_checkorder(fffffd800872e188,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105
rw_enter_read(fffffd800872e178) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112
uvmfault_lookup(ffff8000211bbd60,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758
uvm_fault_check(ffff8000211bbd60,ffff8000211bbd98,ffff8000211bbdc0) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674
uvm_fault(fffffd800872e170,20004000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602
kpageflttrap(ffff8000211bbef0,200041f7) at kpageflttrap+0x209
kerntrap(ffff8000211bbef0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
soo_ioctl(ffff8000211bc1a0,c0106924,ffff8000211bc440,ffff800021142548) at soo_ioctl+0x26c
fifo_ioctl(ffff8000211bc288) at fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:307
VOP_IOCTL(fffffd806eec44d0,c0106924,ffff8000211bc440,3,fffffd807f7d8a20,ffff800021142548) at VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264
vn_ioctl(fffffd806e615600,c0106924,ffff8000211bc440,ffff800021142548) at vn_ioctl+0xbc sys/kern/vfs_vnops.c:531
sys_ioctl(ffff800021142548,ffff8000211bc558,ffff8000211bc5b0) at sys_ioctl+0x4a2
syscall(ffff8000211bc620) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000211bc620) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
ddb{0}> show registers
rdi 0x3
rsi 0xffffffff8294abb0 __sancov_gen_cov_switch_values.134
rbp 0xffff8000211bba50
rbx 0x3
rdx 0x3fd
rcx 0
rax 0x1
r8 0xffff8000211bb9c0
r9 0x8080808080808080
r10 0xc12b07be5ed63e0f
r11 0xf82b5537488ec965
r12 0xffffffff82ab0900 w_lodata+0x52f90
r13 0
r14 0xffffffff82aac910 w_lodata+0x4efa0
PROC (syz-executor4258206138) pid=477729 stat=onproc
flags process=2<EXEC> proc=0
pri=17, usrpri=52, nice=20
forw=0xffffffffffffffff, list=0xffff8000211427e8,0xffffffff82b3d400
process=0xffff8000ffff94d0 user=0xffff8000211b7000, vmspace=0xfffffd800872e170
estcpu=2, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb{0}> ps
36456 405076 94374 0 3 0x10008a sigsusp ksh
94374 65530 91918 0 3 0x9a kqread sshd
84948 51440 1 0 3 0x100083 ttyin getty
91918 196869 1 0 3 0x88 kqread sshd
44516 225686 85172 73 3 0x1100090 kqread syslogd
85172 182253 1 0 3 0x100082 netio syslogd
36764 6232 1 0 3 0x100080 kqread resolvd
28961 96207 13667 77 3 0x100092 kqread dhcpleased
9876 117103 13667 77 3 0x100092 kqread dhcpleased
13667 410466 1 0 3 0x80 kqread dhcpleased
61858 271553 0 0 3 0x14200 bored smr
15588 416771 0 0 3 0x14200 pgzero zerothread
99835 20073 0 0 3 0x14200 aiodoned aiodoned
63287 151687 0 0 3 0x14200 syncer update
82843 150219 0 0 3 0x14200 cleaner cleaner
37181 111190 0 0 3 0x14200 reaper reaper
98556 77054 0 0 3 0x14200 pgdaemon pagedaemon
33262 45910 0 0 3 0x14200 bored viomb
12515 410526 0 0 3 0x40014200 acpi0 acpi0
84867 35831 0 0 7 0x40014200 idle1
67496 409908 0 0 3 0x14200 bored softnet
29852 249938 0 0 3 0x14200 bored systqmp
29850 392125 0 0 3 0x14200 bored systq
52049 251082 0 0 3 0x40014200 bored softclock
25321 246638 0 0 3 0x40014200 idle0
1 176171 0 0 3 0x82 wait init
Process 16242 (syz-executor4258206138) thread 0xffff800021142548 (477729)
#2 soo_ioctl+0x26c
#3 fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:307
#4 VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264
#5 vn_ioctl+0xbc sys/kern/vfs_vnops.c:531
#6 sys_ioctl+0x4a2
#7 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#7 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#8 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 1 (0xffffffff829de988)
#0 witness_lock+0x44d
#1 vn_ioctl+0x41 sys/kern/vfs_vnops.c:514
ifaddr 24 7K 7K 78643K 24 0
counters 40 33K 33K 78643K 40 0
ioctlops 0 0K 2K 78643K 25 0
vnodes 1167 73K 73K 78643K 1180 0
proc 55 74K 75K 78643K 226 0
ether_multi 1 0K 0K 78643K 1 0
exec 0 0K 2K 78643K 406 0
temp 19 4690K 4753K 78643K 3118 0
kqueue 11 16K 18K 78643K 24 0
rtentry 112 23 0 1 1 0 1 1 0 8 0
unpcb 136 35 0 20 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 25 0 19 1 0 1 1 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 1417 0 39 92 0 92 92 0 8 0
nchpl 144 1591 0 47 58 0 58 58 0 8 0
uvmvnodes 80 1426 0 0 30 0 30 30 0 8 0
vnodes 224 1426 0 0 84 0 84 84 0 8 0
namei 1024 4183 0 4183 1 0 1 1 0 8 1
percpumem 16 32 0 0 1 0 1 1 0 8 0
scxspl 216 3780 0 3780 2 1 1 2 0 8 1
plimitpl 152 15 0 9 1 0 1 1 0 8 0
sigapl 424 301 0 274 4 0 4 4 0 8 0
knotepl 120 45 0 0 2 0 2 2 0 8 0
kqueuepl 216 20 0 13 1 0 1 1 0 8 0
pipepl 336 82 0 79 1 0 1 1 0 8 0
fdescpl 496 287 0 274 3 1 2 3 0 8 0
filepl 152 1029 0 975 3 0 3 3 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 17 0 9 1 0 1 1 0 8 0
pgrppl 48 17 0 9 1 0 1 1 0 8 0
ucredpl 96 64 0 54 1 0 1 1 0 8 0
zombiepl 144 274 0 274 1 0 1 1 0 8 1
processpl 1064 301 0 274 3 1 2 3 0 8 0
procpl 672 301 0 274 3 0 3 3 0 8 0
sockpl 480 80 0 56 3 0 3 3 0 8 0
mcl8k 8192 4 0 0 1 0 1 1 0 8 0
mcl4k 4096 4 0 0 1 0 1 1 0 8 0
mcl2k 2048 63 0 0 8 0 8 8 0 8 0
bufpl 288 1938 0 89 133 0 133 133 0 8 0
anonpl 24 38832 0 36784 16 2 14 15 0 186 1
amapchunkpl 152 3732 0 3606 7 1 6 7 0 158 0
amappl16 200 26 0 25 2 1 1 1 0 8 0
amappl15 192 62 0 59 1 0 1 1 0 8 0
amappl14 184 1 0 1 1 1 0 1 0 8 0
amappl13 176 32 0 31 2 1 1 1 0 8 0
amappl12 168 16 0 16 2 1 1 1 0 8 1
amappl11 160 38 0 28 1 0 1 1 0 8 0
amappl10 152 4 0 4 1 1 0 1 0 8 0
amappl9 144 444 0 442 1 0 1 1 0 8 0
amappl8 136 352 0 348 1 0 1 1 0 8 0
amappl7 128 60 0 57 1 0 1 1 0 8 0
amappl6 120 109 0 96 1 0 1 1 0 8 0
amappl5 112 171 0 162 1 0 1 1 0 8 0
amappl4 104 597 0 576 1 0 1 1 0 8 0
amappl3 96 115 0 106 1 0 1 1 0 8 0
amappl2 88 356 0 319 1 0 1 1 0 8 0
amappl1 80 8210 0 7859 9 0 9 9 0 8 0
amappl 88 1782 0 1726 2 0 2 2 0 92 0
vmmpekpl 168 5963 0 5949 1 0 1 1 0 8 0
vmmpepl 168 25037 0 24273 38 0 38 38 0 357 0
vmsppl 368 286 0 274 2 0 2 2 0 8 0
rwobjpl 56 9008 0 7072 28 0 28 28 0 8 0
pdppl 4096 581 0 548 54 21 33 41 0 8 0
pvpl 32 126588 0 122801 34 0 34 34 0 265 1
pmappl 248 286 0 274 2 1 1 2 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
witness_checkorder(fffffd800872e188,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105
rw_enter_read(fffffd800872e178) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112
uvmfault_lookup(ffff8000211bbd60,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758
uvm_fault_check(ffff8000211bbd60,ffff8000211bbd98,ffff8000211bbdc0) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674
uvm_fault(fffffd800872e170,20004000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602
kpageflttrap(ffff8000211bbef0,200041f7) at kpageflttrap+0x209
kerntrap(ffff8000211bbef0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
soo_ioctl(ffff8000211bc1a0,c0106924,ffff8000211bc440,ffff800021142548) at soo_ioctl+0x26c
fifo_ioctl(ffff8000211bc288) at fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:307
VOP_IOCTL(fffffd806eec44d0,c0106924,ffff8000211bc440,3,fffffd807f7d8a20,ffff800021142548) at VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264
vn_ioctl(fffffd806e615600,c0106924,ffff8000211bc440,ffff800021142548) at vn_ioctl+0xbc sys/kern/vfs_vnops.c:531
sys_ioctl(ffff800021142548,ffff8000211bc558,ffff8000211bc5b0) at sys_ioctl+0x4a2
syscall(ffff8000211bc620) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000211bc620) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
ddb{1}> trace
x86_ipi_db(ffff800020ce8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393
sched_idle(ffff800020ce8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178
end trace frame: 0x0, count: -5
ddb{1}>
HEAD commit: d895c343d40b Constify struct cfattach, not struct cfdriver
git tree: openbsd
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=010c0e486d07047d0e85
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13517355700000
dashboard link: https://syzkaller.appspot.com/bug?extid=010c0e486d07047d0e85
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=105755b5700000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+010c0e...@syzkaller.appspotmail.com
login: witness: lock order reversal:
1st 0xffffffff8290fe50 netlock (netlock)
lock order "&map->lock"(rwlock) -> "netlock"(rwlock) first seen at:
#0 rw_enter_write+0x5b sys/kern/kern_rwlock.c:128
#1 udp_sysctl+0x8a sys/netinet/udp_usrreq.c:1269
#2 sys_sysctl+0x209 sys/kern/kern_sysctl.c:249
#3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#4 Xsyscall+0x128
lock order "netlock"(rwlock) -> "&map->lock"(rwlock) first seen at:
#0 rw_enter_read+0x66 sys/kern/kern_rwlock.c:112
#1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758
#2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674
#3 uvm_fault+0x102 sys/uvm/uvm_fault.c:602
#4 kpageflttrap+0x209
#5 kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
#6 alltraps_kern_meltdown+0x7b
#7 copyout+0x53
#8 ifioctl_get+0x2dd
#0 rw_enter_write+0x5b sys/kern/kern_rwlock.c:128
#1 udp_sysctl+0x8a sys/netinet/udp_usrreq.c:1269
#2 sys_sysctl+0x209 sys/kern/kern_sysctl.c:249
#3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#4 Xsyscall+0x128
lock order "netlock"(rwlock) -> "&map->lock"(rwlock) first seen at:
#0 rw_enter_read+0x66 sys/kern/kern_rwlock.c:112
#1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758
#2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674
#3 uvm_fault+0x102 sys/uvm/uvm_fault.c:602
#4 kpageflttrap+0x209
#5 kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
#6 alltraps_kern_meltdown+0x7b
#7 copyout+0x53
#9 soo_ioctl+0x26c
#10 fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:307
#11 VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264
#12 vn_ioctl+0xbc sys/kern/vfs_vnops.c:531
#13 sys_ioctl+0x4a2
#14 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#14 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#15 Xsyscall+0x128
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:440
witness_checkorder(fffffd800872e188,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline]
witness_checkorder(fffffd800872e188,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105
rw_enter_read(fffffd800872e178) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112
uvmfault_lookup(ffff8000211bbd60,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758
uvm_fault_check(ffff8000211bbd60,ffff8000211bbd98,ffff8000211bbdc0) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674
uvm_fault(fffffd800872e170,20004000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602
kpageflttrap(ffff8000211bbef0,200041f7) at kpageflttrap+0x209
kerntrap(ffff8000211bbef0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
copyout() at copyout+0x53
ifioctl_get(c0106924,ffff8000211bc440) at ifioctl_get+0x2dd
copyout() at copyout+0x53
soo_ioctl(ffff8000211bc1a0,c0106924,ffff8000211bc440,ffff800021142548) at soo_ioctl+0x26c
fifo_ioctl(ffff8000211bc288) at fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:307
VOP_IOCTL(fffffd806eec44d0,c0106924,ffff8000211bc440,3,fffffd807f7d8a20,ffff800021142548) at VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264
vn_ioctl(fffffd806e615600,c0106924,ffff8000211bc440,ffff800021142548) at vn_ioctl+0xbc sys/kern/vfs_vnops.c:531
sys_ioctl(ffff800021142548,ffff8000211bc558,ffff8000211bc5b0) at sys_ioctl+0x4a2
syscall(ffff8000211bc620) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000211bc620) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffe3810, count: -18
end of kernel
ddb{0}> show registers
rdi 0x3
rsi 0xffffffff8294abb0 __sancov_gen_cov_switch_values.134
rbp 0xffff8000211bba50
rbx 0x3
rdx 0x3fd
rcx 0
rax 0x1
r8 0xffff8000211bb9c0
r9 0x8080808080808080
r10 0xc12b07be5ed63e0f
r11 0xf82b5537488ec965
r12 0xffffffff82ab0900 w_lodata+0x52f90
r13 0
r14 0xffffffff82aac910 w_lodata+0x4efa0
r15 0xfffffd8002f62d80
rip 0xffffffff8138d658 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff8000211bba40
rip 0xffffffff8138d658 db_enter+0x18
cs 0x8
rflags 0x246
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
db_enter+0x18: addq $0x8,%rsp
PROC (syz-executor4258206138) pid=477729 stat=onproc
flags process=2<EXEC> proc=0
pri=17, usrpri=52, nice=20
forw=0xffffffffffffffff, list=0xffff8000211427e8,0xffffffff82b3d400
process=0xffff8000ffff94d0 user=0xffff8000211b7000, vmspace=0xfffffd800872e170
estcpu=2, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
*16242 477729 36456 0 7 0x2 syz-executor4258206138
36456 405076 94374 0 3 0x10008a sigsusp ksh
94374 65530 91918 0 3 0x9a kqread sshd
84948 51440 1 0 3 0x100083 ttyin getty
91918 196869 1 0 3 0x88 kqread sshd
44516 225686 85172 73 3 0x1100090 kqread syslogd
85172 182253 1 0 3 0x100082 netio syslogd
36764 6232 1 0 3 0x100080 kqread resolvd
28961 96207 13667 77 3 0x100092 kqread dhcpleased
9876 117103 13667 77 3 0x100092 kqread dhcpleased
13667 410466 1 0 3 0x80 kqread dhcpleased
61858 271553 0 0 3 0x14200 bored smr
15588 416771 0 0 3 0x14200 pgzero zerothread
99835 20073 0 0 3 0x14200 aiodoned aiodoned
63287 151687 0 0 3 0x14200 syncer update
82843 150219 0 0 3 0x14200 cleaner cleaner
37181 111190 0 0 3 0x14200 reaper reaper
98556 77054 0 0 3 0x14200 pgdaemon pagedaemon
33262 45910 0 0 3 0x14200 bored viomb
12515 410526 0 0 3 0x40014200 acpi0 acpi0
84867 35831 0 0 7 0x40014200 idle1
67496 409908 0 0 3 0x14200 bored softnet
29852 249938 0 0 3 0x14200 bored systqmp
29850 392125 0 0 3 0x14200 bored systq
52049 251082 0 0 3 0x40014200 bored softclock
25321 246638 0 0 3 0x40014200 idle0
1 176171 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 16242 (syz-executor4258206138) thread 0xffff800021142548 (477729)
shared rwlock netlock r = 0 (0xffffffff8290fe50)
#0 witness_lock+0x44d
#1 ifioctl_get+0x2d5 sys/net/if.c:2319
#0 witness_lock+0x44d
#2 soo_ioctl+0x26c
#3 fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:307
#4 VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264
#5 vn_ioctl+0xbc sys/kern/vfs_vnops.c:531
#6 sys_ioctl+0x4a2
#7 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#7 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#8 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 1 (0xffffffff829de988)
#0 witness_lock+0x44d
#1 vn_ioctl+0x41 sys/kern/vfs_vnops.c:514
#2 sys_ioctl+0x4a2
#3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#4 Xsyscall+0x128
ddb{0}> show malloc
#3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#4 Xsyscall+0x128
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10143 6388K 6419K 78643K 11233 0
pcb 13 8K 8K 78643K 13 0
rtable 62 2K 2K 78643K 114 0
ifaddr 24 7K 7K 78643K 24 0
counters 40 33K 33K 78643K 40 0
ioctlops 0 0K 2K 78643K 25 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 4 0
vnodes 1167 73K 73K 78643K 1180 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
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 1K 78643K 2 0
VM map 2 1K 1K 78643K 2 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12548 0
file desc 1 0K 0K 78643K 1 0
ACPI 1697 195K 286K 78643K 12548 0
proc 55 74K 75K 78643K 226 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 25 122K 122K 78643K 25 0
MSDOSFS mount 1 16K 16K 78643K 1 0
exec 0 0K 2K 78643K 406 0
tdb 3 0K 0K 78643K 3 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 72 3K 5K 78643K 2044 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 aobj 3 2K 2K 78643K 3 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
NDP 3 0K 0K 78643K 3 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
temp 19 4690K 4753K 78643K 3118 0
kqueue 11 16K 18K 78643K 24 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 20 0 17 1 0 1 1 0 8 0
plcache 128 22 0 0 1 0 1 1 0 8 0
rtentry 112 23 0 1 1 0 1 1 0 8 0
unpcb 136 35 0 20 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 25 0 19 1 0 1 1 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 1417 0 39 87 0 87 87 0 8 0
ffsino 272 1417 0 39 92 0 92 92 0 8 0
nchpl 144 1591 0 47 58 0 58 58 0 8 0
uvmvnodes 80 1426 0 0 30 0 30 30 0 8 0
vnodes 224 1426 0 0 84 0 84 84 0 8 0
namei 1024 4183 0 4183 1 0 1 1 0 8 1
percpumem 16 32 0 0 1 0 1 1 0 8 0
scxspl 216 3780 0 3780 2 1 1 2 0 8 1
plimitpl 152 15 0 9 1 0 1 1 0 8 0
sigapl 424 301 0 274 4 0 4 4 0 8 0
knotepl 120 45 0 0 2 0 2 2 0 8 0
kqueuepl 216 20 0 13 1 0 1 1 0 8 0
pipepl 336 82 0 79 1 0 1 1 0 8 0
fdescpl 496 287 0 274 3 1 2 3 0 8 0
filepl 152 1029 0 975 3 0 3 3 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 17 0 9 1 0 1 1 0 8 0
pgrppl 48 17 0 9 1 0 1 1 0 8 0
ucredpl 96 64 0 54 1 0 1 1 0 8 0
zombiepl 144 274 0 274 1 0 1 1 0 8 1
processpl 1064 301 0 274 3 1 2 3 0 8 0
procpl 672 301 0 274 3 0 3 3 0 8 0
sockpl 480 80 0 56 3 0 3 3 0 8 0
mcl8k 8192 4 0 0 1 0 1 1 0 8 0
mcl4k 4096 4 0 0 1 0 1 1 0 8 0
mcl2k 2048 63 0 0 8 0 8 8 0 8 0
mtagpl 96 3 0 0 1 0 1 1 0 8 0
mbufpl 256 106 0 0 7 0 7 7 0 8 0
bufpl 288 1938 0 89 133 0 133 133 0 8 0
anonpl 24 38832 0 36784 16 2 14 15 0 186 1
amapchunkpl 152 3732 0 3606 7 1 6 7 0 158 0
amappl16 200 26 0 25 2 1 1 1 0 8 0
amappl15 192 62 0 59 1 0 1 1 0 8 0
amappl14 184 1 0 1 1 1 0 1 0 8 0
amappl13 176 32 0 31 2 1 1 1 0 8 0
amappl12 168 16 0 16 2 1 1 1 0 8 1
amappl11 160 38 0 28 1 0 1 1 0 8 0
amappl10 152 4 0 4 1 1 0 1 0 8 0
amappl9 144 444 0 442 1 0 1 1 0 8 0
amappl8 136 352 0 348 1 0 1 1 0 8 0
amappl7 128 60 0 57 1 0 1 1 0 8 0
amappl6 120 109 0 96 1 0 1 1 0 8 0
amappl5 112 171 0 162 1 0 1 1 0 8 0
amappl4 104 597 0 576 1 0 1 1 0 8 0
amappl3 96 115 0 106 1 0 1 1 0 8 0
amappl2 88 356 0 319 1 0 1 1 0 8 0
amappl1 80 8210 0 7859 9 0 9 9 0 8 0
amappl 88 1782 0 1726 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 72 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 287 0 274 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
aobjpl 72 2 0 0 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 287 0 274 1 0 1 1 0 8 0
vmmpekpl 168 5963 0 5949 1 0 1 1 0 8 0
vmmpepl 168 25037 0 24273 38 0 38 38 0 357 0
vmsppl 368 286 0 274 2 0 2 2 0 8 0
rwobjpl 56 9008 0 7072 28 0 28 28 0 8 0
pdppl 4096 581 0 548 54 21 33 41 0 8 0
pvpl 32 126588 0 122801 34 0 34 34 0 265 1
pmappl 248 286 0 274 2 1 1 2 0 8 0
extentpl 40 58 0 38 1 0 1 1 0 8 0
phpool 112 402 0 23 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:440
witness_checkorder(fffffd800872e188,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline]
witness_checkorder(fffffd800872e188,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105
rw_enter_read(fffffd800872e178) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112
uvmfault_lookup(ffff8000211bbd60,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758
uvm_fault_check(ffff8000211bbd60,ffff8000211bbd98,ffff8000211bbdc0) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674
uvm_fault(fffffd800872e170,20004000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602
kpageflttrap(ffff8000211bbef0,200041f7) at kpageflttrap+0x209
kerntrap(ffff8000211bbef0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
copyout() at copyout+0x53
ifioctl_get(c0106924,ffff8000211bc440) at ifioctl_get+0x2dd
copyout() at copyout+0x53
soo_ioctl(ffff8000211bc1a0,c0106924,ffff8000211bc440,ffff800021142548) at soo_ioctl+0x26c
fifo_ioctl(ffff8000211bc288) at fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:307
VOP_IOCTL(fffffd806eec44d0,c0106924,ffff8000211bc440,3,fffffd807f7d8a20,ffff800021142548) at VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264
vn_ioctl(fffffd806e615600,c0106924,ffff8000211bc440,ffff800021142548) at vn_ioctl+0xbc sys/kern/vfs_vnops.c:531
sys_ioctl(ffff800021142548,ffff8000211bc558,ffff8000211bc5b0) at sys_ioctl+0x4a2
syscall(ffff8000211bc620) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000211bc620) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffe3810, count: -18
end of kernel
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
ddb{1}> trace
x86_ipi_db(ffff800020ce8ff0) 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
acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
sched_idle(ffff800020ce8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178
end trace frame: 0x0, count: -5
ddb{1}>
Anton Lindqvist
Mar 15, 2022, 2:18:58 AM3/15/22
to syzbot, syzkaller-o...@googlegroups.com
#syz fix: Revert holding a read lock on the map while copying out data during sysctl(2).
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