uvm_fault: ffs2_balloc (3)
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syzbot
Jan 19, 2024, 8:54:20 PMJan 19
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 59674edd175d add iwn(4) to arm64 GENERIC
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=17b16473e80000
kernel config: https://syzkaller.appspot.com/x/.config?x=1bc15e68cd2a49e5
dashboard link: https://syzkaller.appspot.com/bug?extid=4ce157a9575505d57968
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/bd3745f9bee0/disk-59674edd.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/ba7ba409784b/bsd-59674edd.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/285356795e62/kernel-59674edd.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4ce157...@syzkaller.appspotmail.com
uvm_fault(0xffffffff82dd0f38, 0xffff8000266c20b8, 0, 1) -> d
kernel: page fault trap, code=0
Stopped at ffs2_balloc+0x7ae: movq 0(%rcx,%rax,8),%r15
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*249096 23651 0 0x2 0x1 0 syz-executor.3
ffs2_balloc(fffffd806f286b40,8fda3,45,fffffd807f7d76e8,1,ffff80002bf24ca8) at ffs2_balloc+0x7ae sys/ufs/ffs/ffs_balloc.c:660
ffs_write(ffff80002bf24d40) at ffs_write+0x411 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd80713feb00,ffff80002bf24df0,3,fffffd807f7d76e8) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a679ab0,fffffd80713feb00,fffffd807f7d76e8,ffff80002bf24eb0,ffff80002bf24e90) at ktrwriteraw+0x14a sys/kern/kern_ktrace.c:682
ktrnamei(ffff80002a679ab0,ffff80002a6e2c00) at ktrnamei+0x118 ktrwrite sys/kern/kern_ktrace.c:623 [inline]
ktrnamei(ffff80002a679ab0,ffff80002a6e2c00) at ktrnamei+0x118 sys/kern/kern_ktrace.c:217
namei(ffff80002bf25090) at namei+0x1e4 sys/kern/vfs_lookup.c:170
domkdirat(ffff80002a679ab0,ffffff9c,736775c578b0,1ff) at domkdirat+0x79 sys/kern/vfs_syscalls.c:3058
syscall(ffff80002bf252a0) at syscall+0x5ef sys/arch/amd64/amd64/trap.c:591
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x736775c57920, count: 6
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports. Insufficient info makes it difficult to find and fix bugs.
ddb>
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
*cpu0: uvm_fault(0xffffffff82dd0f38, 0xffff8000266c20b8, 0, 1) -> d
ddb> trace
ffs2_balloc(fffffd806f286b40,8fda3,45,fffffd807f7d76e8,1,ffff80002bf24ca8) at ffs2_balloc+0x7ae sys/ufs/ffs/ffs_balloc.c:660
ffs_write(ffff80002bf24d40) at ffs_write+0x411 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd80713feb00,ffff80002bf24df0,3,fffffd807f7d76e8) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a679ab0,fffffd80713feb00,fffffd807f7d76e8,ffff80002bf24eb0,ffff80002bf24e90) at ktrwriteraw+0x14a sys/kern/kern_ktrace.c:682
ktrnamei(ffff80002a679ab0,ffff80002a6e2c00) at ktrnamei+0x118 ktrwrite sys/kern/kern_ktrace.c:623 [inline]
ktrnamei(ffff80002a679ab0,ffff80002a6e2c00) at ktrnamei+0x118 sys/kern/kern_ktrace.c:217
namei(ffff80002bf25090) at namei+0x1e4 sys/kern/vfs_lookup.c:170
domkdirat(ffff80002a679ab0,ffffff9c,736775c578b0,1ff) at domkdirat+0x79 sys/kern/vfs_syscalls.c:3058
syscall(ffff80002bf252a0) at syscall+0x5ef sys/arch/amd64/amd64/trap.c:591
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x736775c57920, count: -9
ddb> show registers
rdi 0
rsi 0
rbp 0xffff80002bf24c60
rbx 0xffffffff
rdx 0
rcx 0xffff8000266c2000
rax 0x17
r8 0xffffffffffffffff
r9 0xffff80002bf24ca8
r10 0xade88159d0c10b24
r11 0x933e7ad6b5ab315e
r12 0x10
r13 0xfffffd8068061a48
r14 0
r15 0
rip 0xffffffff82294d7e ffs2_balloc+0x7ae
cs 0x8
rflags 0x10202 __ALIGN_SIZE+0xf202
rsp 0xffff80002bf24ad0
ss 0x10
ffs2_balloc+0x7ae: movq 0(%rcx,%rax,8),%r15
ddb> show proc
PROC (syz-executor.3) tid=249096 pid=23651 tcnt=1 stat=onproc
flags process=2<EXEC> proc=1<INKTR>
runpri=17, usrpri=78, slppri=17, nice=20
wchan=0x0, wmesg=, ps_single=0x0
forw=0xffffffffffffffff, list=0xffff80002a68b7e8,0xffff80002a6792c8
process=0xffff8000ffff3690 user=0xffff80002bf20000, vmspace=0xfffffd806977bb90
estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
94402 474585 28239 0 2 0 syz-executor.2
419 270320 8945 0 2 0 syz-executor.1
419 142255 8945 0 3 0x4000080 fsleep syz-executor.1
50946 282797 55009 0 2 0 syz-executor.6
4071 356672 4718 0 2 0 syz-executor.4
4071 508566 4718 0 3 0x4000000 smrbar syz-executor.4
4071 452735 4718 0 3 0x4000000 clonelk syz-executor.4
28239 39785 32480 0 2 0x482 syz-executor.2
92269 260226 0 0 3 0x14280 nfsidl nfsio
37064 67659 0 0 3 0x14280 nfsidl nfsio
89519 5930 0 0 3 0x14280 nfsidl nfsio
16215 498890 0 0 3 0x14280 nfsidl nfsio
37441 420671 0 0 3 0x14280 nfsidl nfsio
35565 383677 0 0 3 0x14280 nfsidl nfsio
80215 160190 0 0 3 0x14280 nfsidl nfsio
63866 305138 0 0 3 0x14280 nfsidl nfsio
37645 123668 0 0 3 0x14280 nfsidl nfsio
31289 323385 0 0 3 0x14280 nfsidl nfsio
44343 5969 0 0 3 0x14280 nfsidl nfsio
56920 521698 0 0 3 0x14280 nfsidl nfsio
26455 227767 0 0 3 0x14280 nfsidl nfsio
45990 455 0 0 3 0x14280 nfsidl nfsio
98695 128496 0 0 3 0x14280 nfsidl nfsio
37227 5424 0 0 3 0x14280 nfsidl nfsio
66202 513884 0 0 3 0x14280 nfsidl nfsio
52671 142339 0 0 3 0x14280 nfsidl nfsio
45464 141288 0 0 3 0x14280 nfsidl nfsio
38373 520217 0 0 3 0x14280 nfsidl nfsio
55009 494005 32480 0 2 0x2 syz-executor.6
14847 177957 32480 0 2 0x2 syz-executor.7
26823 270823 32480 0 2 0x482 syz-executor.5
77963 191748 32480 0 2 0x2 syz-executor.0
36024 263655 1 0 3 0x100083 ttyin getty
4718 153668 32480 0 2 0x482 syz-executor.4
8945 98394 32480 0 2 0x482 syz-executor.1
*23651 249096 32480 0 7 0x3 syz-executor.3
78535 428444 0 0 3 0x14200 bored sosplice
32480 516135 92367 0 3 0x2000082 thrsleep syz-fuzzer
32480 10034 92367 0 2 0x6000482 syz-fuzzer
32480 119008 92367 0 3 0x6000082 wait syz-fuzzer
32480 202268 92367 0 3 0x6000082 wait syz-fuzzer
32480 103775 92367 0 3 0x6000082 wait syz-fuzzer
32480 315053 92367 0 3 0x6000082 thrsleep syz-fuzzer
32480 229256 92367 0 3 0x6000082 thrsleep syz-fuzzer
32480 511323 92367 0 3 0x6000082 wait syz-fuzzer
32480 460265 92367 0 3 0x6000082 wait syz-fuzzer
32480 442146 92367 0 3 0x6000082 wait syz-fuzzer
32480 146421 92367 0 3 0x6000082 kqread syz-fuzzer
32480 210706 92367 0 3 0x6000082 thrsleep syz-fuzzer
32480 409845 92367 0 3 0x6000082 wait syz-fuzzer
32480 496286 92367 0 3 0x6000082 wait syz-fuzzer
92367 171060 4621 0 3 0x10008a sigsusp ksh
4621 144772 80707 0 3 0x9a kqread sshd
80707 410341 1 0 3 0x88 kqread sshd
26440 481933 23230 73 3 0x1100090 kqread syslogd
23230 259867 1 0 3 0x100082 netio syslogd
29077 397768 1 0 3 0x100080 kqread resolvd
6098 207118 4242 77 3 0x100092 kqread dhcpleased
12113 292161 4242 77 3 0x100092 kqread dhcpleased
4242 489794 1 0 3 0x80 kqread dhcpleased
79025 200388 0 0 3 0x14200 bored smr
6659 10137 0 0 2 0x14200 zerothread
76616 378006 0 0 3 0x14200 aiodoned aiodoned
99789 347115 0 0 3 0x14200 syncer update
83275 389845 0 0 3 0x14200 cleaner cleaner
44487 244254 0 0 3 0x14200 reaper reaper
86957 374522 0 0 3 0x14200 pgdaemon pagedaemon
42603 153260 0 0 3 0x14200 bored viomb
13534 211328 0 0 3 0x40014200 acpi0 acpi0
13771 494614 0 0 3 0x14200 bored softnet3
88773 388231 0 0 3 0x14200 bored softnet2
4629 398055 0 0 3 0x14200 bored softnet1
56645 102887 0 0 3 0x14200 bored softnet0
13857 131583 0 0 3 0x14200 bored systqmp
9138 214510 0 0 3 0x14200 bored systq
48098 224649 0 0 2 0x40014200 softclock
58022 185581 0 0 3 0x40014200 idle0
1 265076 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb> show all locks
No such command
ddb> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10195 6432K 6993K 166960K 18764 0
pcb 15 18K 20K 166960K 332 0
rtable 235 15K 15K 166960K 1482 0
pf 36 10K 10K 166960K 210 0
ifaddr 44 12K 12K 166960K 201 0
ifgroup 61 2K 2K 166960K 337 0
sysctl 2 0K 0K 166960K 4 0
counters 33 17K 17K 166960K 107 0
ioctlops 0 0K 2K 166960K 317 0
iov 0 0K 32K 166960K 916 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1437 90K 90K 166960K 4383 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 56 0
VM map 2 1K 1K 166960K 2 0
sem 12 1K 1K 166960K 446 0
dirhash 12 2K 2K 166960K 33 0
ACPI 1697 195K 286K 166960K 12548 0
file desc 14 49K 73K 166960K 4250 0
sigio 1 0K 0K 166960K 50 0
proc 57 59K 75K 166960K 1318 0
subproc 104 6K 6K 166960K 403 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 269 0
in_multi 94 6K 7K 166960K 387 0
ether_multi 1 0K 0K 166960K 9 0
mrt 0 0K 0K 166960K 6 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 73 334K 334K 166960K 73 0
exec 0 0K 1K 166960K 1077 0
tdb 3 0K 0K 166960K 3 0
pagedep 1 8K 8K 166960K 1 0
inodedep 1 32K 32K 166960K 1 0
newblk 1 0K 0K 166960K 1 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 364 299K 300K 166960K 40146 0
UVM aobj 131 4K 4K 166960K 134 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 151 0
NDP 14 0K 2K 166960K 152 0
temp 74 6704K 6832K 166960K 44439 0
kqueue 12 18K 28K 166960K 372 0
SYN cache 2 16K 16K 166960K 2 0
ddb> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
rtpcb 120 425 0 422 4 3 1 3 0 8 0
rtentry 112 436 0 330 7 3 4 4 0 8 0
unpcb 144 3397 0 3384 37 33 4 8 0 8 3
syncache 312 60 0 60 9 9 0 1 0 8 0
tcpqe 32 632 0 632 8 8 0 1 0 8 0
tcpcb 808 1214 0 1179 44 40 4 12 0 8 0
arp 88 85 0 68 1 0 1 1 0 8 0
ipq 40 1 0 1 1 1 0 1 0 8 0
ipqe 40 3 0 3 1 1 0 1 0 8 0
inpcb 336 3530 0 3490 74 65 9 17 0 8 4
nd6 104 104 0 79 1 0 1 1 0 8 0
pkpcb 40 84 0 84 2 2 0 1 0 8 0
kcovpl 48 31 0 23 1 0 1 1 0 8 0
ppxss 1160 24 0 23 2 1 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 1644 0 1165 48 18 30 30 0 8 0
art_table 32 1645 0 1165 5 1 4 4 0 8 0
art_node 16 432 0 337 1 0 1 1 0 8 0
sysvmsgpl 40 4 0 0 1 0 1 1 0 8 0
semupl 112 4 0 4 1 1 0 1 0 8 0
semapl 112 434 0 424 1 0 1 1 0 8 0
shmpl 112 131 0 3 4 0 4 4 0 8 0
dirhash 1024 31 0 14 3 0 3 3 0 8 0
dino2pl 256 7006 0 5548 92 0 92 92 0 8 0
ffsino 240 7006 0 5548 86 0 86 86 0 8 0
nchpl 144 12736 0 11103 63 0 63 63 0 8 0
uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0
vnodes 216 5926 0 0 330 0 330 330 0 8 0
namei 1024 46413 0 46411 11 10 1 3 0 8 0
vcpupl 2048 98 0 0 13 0 13 13 0 8 0
vmpool 664 109 0 11 10 1 9 9 0 8 0
kstatmem 264 176 0 148 2 0 2 2 0 8 0
scxspl 216 51212 0 51212 22 19 3 8 1 8 3
plimitpl 152 535 0 520 1 0 1 1 0 8 0
sigapl 424 4764 0 4701 8 0 8 8 0 8 0
futexpl 64 38899 0 38898 3 2 1 1 0 8 0
knotepl 120 38132 0 38049 8 3 5 5 0 8 2
kqueuepl 184 870 0 862 18 16 2 4 0 8 1
pipepl 288 940 0 912 24 21 3 7 0 8 0
fdescpl 432 4487 0 4462 5 1 4 4 0 8 0
filepl 120 28303 0 28065 50 39 11 16 0 8 1
lockfpl 104 2032 0 2030 7 6 1 2 0 8 0
lockfspl 48 847 0 845 1 0 1 1 0 8 0
sessionpl 144 49 0 33 1 0 1 1 0 8 0
pgrppl 48 97 0 81 1 0 1 1 0 8 0
ucredpl 104 3104 0 3089 1 0 1 1 0 8 0
zombiepl 144 4702 0 4701 2 1 1 1 0 8 0
processpl 1072 4764 0 4701 5 0 5 5 0 8 0
procpl 680 10738 0 10659 15 7 8 9 0 8 0
sosppl 168 32 0 32 5 4 1 1 0 8 1
sockpl 456 7447 0 7392 191 176 15 30 0 8 6
mcl64k 65536 154 0 154 10 9 1 1 0 8 1
mcl16k 16384 111 0 111 12 12 0 1 0 8 0
mcl12k 12288 196 0 196 11 10 1 1 0 8 1
mcl9k 9216 84 0 84 11 11 0 1 0 8 0
mcl8k 8192 435 0 435 12 11 1 1 0 8 1
mcl4k 4096 468 0 468 14 13 1 3 0 8 1
mcl2k2 2112 29 0 29 12 11 1 1 0 8 1
mcl2k 2048 77695 0 77633 50 41 9 30 0 8 0
mtagpl 96 650 0 385 14 7 7 8 0 8 0
mbufpl 256 172711 0 172274 178 147 31 85 0 8 0
bufpl 288 13044 0 6651 457 0 457 457 0 8 0
anonpl 24 633945 0 620176 166 65 101 119 0 188 0
amapchunkpl 152 130613 0 129863 81 45 36 47 0 158 0
amappl16 200 14747 0 14251 102 75 27 38 0 8 0
amappl15 192 14 0 13 1 0 1 1 0 8 0
amappl14 184 221 0 208 2 1 1 2 0 8 0
amappl13 176 9 0 9 2 2 0 1 0 8 0
amappl12 168 5498 0 5472 2 0 2 2 0 8 0
amappl11 160 46 0 36 1 0 1 1 0 8 0
amappl10 152 53 0 43 1 0 1 1 0 8 0
amappl9 144 175 0 174 1 0 1 1 0 8 0
amappl8 136 300 0 227 3 0 3 3 0 8 0
amappl7 128 223 0 199 2 0 2 2 0 8 0
amappl6 120 583 0 575 1 0 1 1 0 8 0
amappl5 112 200 0 191 1 0 1 1 0 8 0
amappl4 104 603 0 578 2 1 1 2 0 8 0
amappl3 96 25552 0 25483 3 0 3 3 0 8 0
amappl2 88 5182 0 5115 3 1 2 3 0 8 0
amappl1 80 25808 0 25314 22 10 12 22 0 8 0
amappl 88 39351 0 39140 7 1 6 7 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 72 133 0 3 3 0 3 3 0 8 0
uaddrrnd 24 4596 0 4473 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 4596 0 4473 1 0 1 1 0 8 0
vmmpekpl 168 36408 0 36336 4 0 4 4 0 8 0
vmmpepl 168 293922 0 291606 230 98 132 137 0 357 18
vmsppl 368 4595 0 4473 14 2 12 12 0 8 0
rwobjpl 24 80394 0 72842 49 1 48 48 0 8 0
pdppl 4096 9198 0 9044 448 286 162 164 0 8 8
pvpl 32 1565832 0 1546464 355 178 177 338 0 265 0
pmappl 216 4595 0 4473 8 0 8 8 0 8 1
extentpl 40 56 0 38 1 0 1 1 0 8 0
phpool 112 1618 0 693 27 0 27 27 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
ffs2_balloc(fffffd806f286b40,8fda3,45,fffffd807f7d76e8,1,ffff80002bf24ca8) at ffs2_balloc+0x7ae sys/ufs/ffs/ffs_balloc.c:660
ffs_write(ffff80002bf24d40) at ffs_write+0x411 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd80713feb00,ffff80002bf24df0,3,fffffd807f7d76e8) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a679ab0,fffffd80713feb00,fffffd807f7d76e8,ffff80002bf24eb0,ffff80002bf24e90) at ktrwriteraw+0x14a sys/kern/kern_ktrace.c:682
ktrnamei(ffff80002a679ab0,ffff80002a6e2c00) at ktrnamei+0x118 ktrwrite sys/kern/kern_ktrace.c:623 [inline]
ktrnamei(ffff80002a679ab0,ffff80002a6e2c00) at ktrnamei+0x118 sys/kern/kern_ktrace.c:217
namei(ffff80002bf25090) at namei+0x1e4 sys/kern/vfs_lookup.c:170
domkdirat(ffff80002a679ab0,ffffff9c,736775c578b0,1ff) at domkdirat+0x79 sys/kern/vfs_syscalls.c:3058
syscall(ffff80002bf252a0) at syscall+0x5ef sys/arch/amd64/amd64/trap.c:591
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x736775c57920, count: -9
ddb> machine ddbcpu 1
No such command
ddb> trace
ffs2_balloc(fffffd806f286b40,8fda3,45,fffffd807f7d76e8,1,ffff80002bf24ca8) at ffs2_balloc+0x7ae sys/ufs/ffs/ffs_balloc.c:660
ffs_write(ffff80002bf24d40) at ffs_write+0x411 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd80713feb00,ffff80002bf24df0,3,fffffd807f7d76e8) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a679ab0,fffffd80713feb00,fffffd807f7d76e8,ffff80002bf24eb0,ffff80002bf24e90) at ktrwriteraw+0x14a sys/kern/kern_ktrace.c:682
ktrnamei(ffff80002a679ab0,ffff80002a6e2c00) at ktrnamei+0x118 ktrwrite sys/kern/kern_ktrace.c:623 [inline]
ktrnamei(ffff80002a679ab0,ffff80002a6e2c00) at ktrnamei+0x118 sys/kern/kern_ktrace.c:217
namei(ffff80002bf25090) at namei+0x1e4 sys/kern/vfs_lookup.c:170
domkdirat(ffff80002a679ab0,ffffff9c,736775c578b0,1ff) at domkdirat+0x79 sys/kern/vfs_syscalls.c:3058
syscall(ffff80002bf252a0) at syscall+0x5ef sys/arch/amd64/amd64/trap.c:591
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x736775c57920, count: -9
---
This report is generated by a bot. It may contain errors.
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If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: 59674edd175d add iwn(4) to arm64 GENERIC
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=17b16473e80000
kernel config: https://syzkaller.appspot.com/x/.config?x=1bc15e68cd2a49e5
dashboard link: https://syzkaller.appspot.com/bug?extid=4ce157a9575505d57968
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/bd3745f9bee0/disk-59674edd.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/ba7ba409784b/bsd-59674edd.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/285356795e62/kernel-59674edd.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4ce157...@syzkaller.appspotmail.com
uvm_fault(0xffffffff82dd0f38, 0xffff8000266c20b8, 0, 1) -> d
kernel: page fault trap, code=0
Stopped at ffs2_balloc+0x7ae: movq 0(%rcx,%rax,8),%r15
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*249096 23651 0 0x2 0x1 0 syz-executor.3
ffs2_balloc(fffffd806f286b40,8fda3,45,fffffd807f7d76e8,1,ffff80002bf24ca8) at ffs2_balloc+0x7ae sys/ufs/ffs/ffs_balloc.c:660
ffs_write(ffff80002bf24d40) at ffs_write+0x411 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd80713feb00,ffff80002bf24df0,3,fffffd807f7d76e8) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a679ab0,fffffd80713feb00,fffffd807f7d76e8,ffff80002bf24eb0,ffff80002bf24e90) at ktrwriteraw+0x14a sys/kern/kern_ktrace.c:682
ktrnamei(ffff80002a679ab0,ffff80002a6e2c00) at ktrnamei+0x118 ktrwrite sys/kern/kern_ktrace.c:623 [inline]
ktrnamei(ffff80002a679ab0,ffff80002a6e2c00) at ktrnamei+0x118 sys/kern/kern_ktrace.c:217
namei(ffff80002bf25090) at namei+0x1e4 sys/kern/vfs_lookup.c:170
domkdirat(ffff80002a679ab0,ffffff9c,736775c578b0,1ff) at domkdirat+0x79 sys/kern/vfs_syscalls.c:3058
syscall(ffff80002bf252a0) at syscall+0x5ef sys/arch/amd64/amd64/trap.c:591
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x736775c57920, count: 6
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports. Insufficient info makes it difficult to find and fix bugs.
ddb>
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
*cpu0: uvm_fault(0xffffffff82dd0f38, 0xffff8000266c20b8, 0, 1) -> d
ddb> trace
ffs2_balloc(fffffd806f286b40,8fda3,45,fffffd807f7d76e8,1,ffff80002bf24ca8) at ffs2_balloc+0x7ae sys/ufs/ffs/ffs_balloc.c:660
ffs_write(ffff80002bf24d40) at ffs_write+0x411 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd80713feb00,ffff80002bf24df0,3,fffffd807f7d76e8) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a679ab0,fffffd80713feb00,fffffd807f7d76e8,ffff80002bf24eb0,ffff80002bf24e90) at ktrwriteraw+0x14a sys/kern/kern_ktrace.c:682
ktrnamei(ffff80002a679ab0,ffff80002a6e2c00) at ktrnamei+0x118 ktrwrite sys/kern/kern_ktrace.c:623 [inline]
ktrnamei(ffff80002a679ab0,ffff80002a6e2c00) at ktrnamei+0x118 sys/kern/kern_ktrace.c:217
namei(ffff80002bf25090) at namei+0x1e4 sys/kern/vfs_lookup.c:170
domkdirat(ffff80002a679ab0,ffffff9c,736775c578b0,1ff) at domkdirat+0x79 sys/kern/vfs_syscalls.c:3058
syscall(ffff80002bf252a0) at syscall+0x5ef sys/arch/amd64/amd64/trap.c:591
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x736775c57920, count: -9
ddb> show registers
rdi 0
rsi 0
rbp 0xffff80002bf24c60
rbx 0xffffffff
rdx 0
rcx 0xffff8000266c2000
rax 0x17
r8 0xffffffffffffffff
r9 0xffff80002bf24ca8
r10 0xade88159d0c10b24
r11 0x933e7ad6b5ab315e
r12 0x10
r13 0xfffffd8068061a48
r14 0
r15 0
rip 0xffffffff82294d7e ffs2_balloc+0x7ae
cs 0x8
rflags 0x10202 __ALIGN_SIZE+0xf202
rsp 0xffff80002bf24ad0
ss 0x10
ffs2_balloc+0x7ae: movq 0(%rcx,%rax,8),%r15
ddb> show proc
PROC (syz-executor.3) tid=249096 pid=23651 tcnt=1 stat=onproc
flags process=2<EXEC> proc=1<INKTR>
runpri=17, usrpri=78, slppri=17, nice=20
wchan=0x0, wmesg=, ps_single=0x0
forw=0xffffffffffffffff, list=0xffff80002a68b7e8,0xffff80002a6792c8
process=0xffff8000ffff3690 user=0xffff80002bf20000, vmspace=0xfffffd806977bb90
estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
94402 474585 28239 0 2 0 syz-executor.2
419 270320 8945 0 2 0 syz-executor.1
419 142255 8945 0 3 0x4000080 fsleep syz-executor.1
50946 282797 55009 0 2 0 syz-executor.6
4071 356672 4718 0 2 0 syz-executor.4
4071 508566 4718 0 3 0x4000000 smrbar syz-executor.4
4071 452735 4718 0 3 0x4000000 clonelk syz-executor.4
28239 39785 32480 0 2 0x482 syz-executor.2
92269 260226 0 0 3 0x14280 nfsidl nfsio
37064 67659 0 0 3 0x14280 nfsidl nfsio
89519 5930 0 0 3 0x14280 nfsidl nfsio
16215 498890 0 0 3 0x14280 nfsidl nfsio
37441 420671 0 0 3 0x14280 nfsidl nfsio
35565 383677 0 0 3 0x14280 nfsidl nfsio
80215 160190 0 0 3 0x14280 nfsidl nfsio
63866 305138 0 0 3 0x14280 nfsidl nfsio
37645 123668 0 0 3 0x14280 nfsidl nfsio
31289 323385 0 0 3 0x14280 nfsidl nfsio
44343 5969 0 0 3 0x14280 nfsidl nfsio
56920 521698 0 0 3 0x14280 nfsidl nfsio
26455 227767 0 0 3 0x14280 nfsidl nfsio
45990 455 0 0 3 0x14280 nfsidl nfsio
98695 128496 0 0 3 0x14280 nfsidl nfsio
37227 5424 0 0 3 0x14280 nfsidl nfsio
66202 513884 0 0 3 0x14280 nfsidl nfsio
52671 142339 0 0 3 0x14280 nfsidl nfsio
45464 141288 0 0 3 0x14280 nfsidl nfsio
38373 520217 0 0 3 0x14280 nfsidl nfsio
55009 494005 32480 0 2 0x2 syz-executor.6
14847 177957 32480 0 2 0x2 syz-executor.7
26823 270823 32480 0 2 0x482 syz-executor.5
77963 191748 32480 0 2 0x2 syz-executor.0
36024 263655 1 0 3 0x100083 ttyin getty
4718 153668 32480 0 2 0x482 syz-executor.4
8945 98394 32480 0 2 0x482 syz-executor.1
*23651 249096 32480 0 7 0x3 syz-executor.3
78535 428444 0 0 3 0x14200 bored sosplice
32480 516135 92367 0 3 0x2000082 thrsleep syz-fuzzer
32480 10034 92367 0 2 0x6000482 syz-fuzzer
32480 119008 92367 0 3 0x6000082 wait syz-fuzzer
32480 202268 92367 0 3 0x6000082 wait syz-fuzzer
32480 103775 92367 0 3 0x6000082 wait syz-fuzzer
32480 315053 92367 0 3 0x6000082 thrsleep syz-fuzzer
32480 229256 92367 0 3 0x6000082 thrsleep syz-fuzzer
32480 511323 92367 0 3 0x6000082 wait syz-fuzzer
32480 460265 92367 0 3 0x6000082 wait syz-fuzzer
32480 442146 92367 0 3 0x6000082 wait syz-fuzzer
32480 146421 92367 0 3 0x6000082 kqread syz-fuzzer
32480 210706 92367 0 3 0x6000082 thrsleep syz-fuzzer
32480 409845 92367 0 3 0x6000082 wait syz-fuzzer
32480 496286 92367 0 3 0x6000082 wait syz-fuzzer
92367 171060 4621 0 3 0x10008a sigsusp ksh
4621 144772 80707 0 3 0x9a kqread sshd
80707 410341 1 0 3 0x88 kqread sshd
26440 481933 23230 73 3 0x1100090 kqread syslogd
23230 259867 1 0 3 0x100082 netio syslogd
29077 397768 1 0 3 0x100080 kqread resolvd
6098 207118 4242 77 3 0x100092 kqread dhcpleased
12113 292161 4242 77 3 0x100092 kqread dhcpleased
4242 489794 1 0 3 0x80 kqread dhcpleased
79025 200388 0 0 3 0x14200 bored smr
6659 10137 0 0 2 0x14200 zerothread
76616 378006 0 0 3 0x14200 aiodoned aiodoned
99789 347115 0 0 3 0x14200 syncer update
83275 389845 0 0 3 0x14200 cleaner cleaner
44487 244254 0 0 3 0x14200 reaper reaper
86957 374522 0 0 3 0x14200 pgdaemon pagedaemon
42603 153260 0 0 3 0x14200 bored viomb
13534 211328 0 0 3 0x40014200 acpi0 acpi0
13771 494614 0 0 3 0x14200 bored softnet3
88773 388231 0 0 3 0x14200 bored softnet2
4629 398055 0 0 3 0x14200 bored softnet1
56645 102887 0 0 3 0x14200 bored softnet0
13857 131583 0 0 3 0x14200 bored systqmp
9138 214510 0 0 3 0x14200 bored systq
48098 224649 0 0 2 0x40014200 softclock
58022 185581 0 0 3 0x40014200 idle0
1 265076 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb> show all locks
No such command
ddb> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10195 6432K 6993K 166960K 18764 0
pcb 15 18K 20K 166960K 332 0
rtable 235 15K 15K 166960K 1482 0
pf 36 10K 10K 166960K 210 0
ifaddr 44 12K 12K 166960K 201 0
ifgroup 61 2K 2K 166960K 337 0
sysctl 2 0K 0K 166960K 4 0
counters 33 17K 17K 166960K 107 0
ioctlops 0 0K 2K 166960K 317 0
iov 0 0K 32K 166960K 916 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1437 90K 90K 166960K 4383 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 56 0
VM map 2 1K 1K 166960K 2 0
sem 12 1K 1K 166960K 446 0
dirhash 12 2K 2K 166960K 33 0
ACPI 1697 195K 286K 166960K 12548 0
file desc 14 49K 73K 166960K 4250 0
sigio 1 0K 0K 166960K 50 0
proc 57 59K 75K 166960K 1318 0
subproc 104 6K 6K 166960K 403 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 269 0
in_multi 94 6K 7K 166960K 387 0
ether_multi 1 0K 0K 166960K 9 0
mrt 0 0K 0K 166960K 6 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 73 334K 334K 166960K 73 0
exec 0 0K 1K 166960K 1077 0
tdb 3 0K 0K 166960K 3 0
pagedep 1 8K 8K 166960K 1 0
inodedep 1 32K 32K 166960K 1 0
newblk 1 0K 0K 166960K 1 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 364 299K 300K 166960K 40146 0
UVM aobj 131 4K 4K 166960K 134 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 151 0
NDP 14 0K 2K 166960K 152 0
temp 74 6704K 6832K 166960K 44439 0
kqueue 12 18K 28K 166960K 372 0
SYN cache 2 16K 16K 166960K 2 0
ddb> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
rtpcb 120 425 0 422 4 3 1 3 0 8 0
rtentry 112 436 0 330 7 3 4 4 0 8 0
unpcb 144 3397 0 3384 37 33 4 8 0 8 3
syncache 312 60 0 60 9 9 0 1 0 8 0
tcpqe 32 632 0 632 8 8 0 1 0 8 0
tcpcb 808 1214 0 1179 44 40 4 12 0 8 0
arp 88 85 0 68 1 0 1 1 0 8 0
ipq 40 1 0 1 1 1 0 1 0 8 0
ipqe 40 3 0 3 1 1 0 1 0 8 0
inpcb 336 3530 0 3490 74 65 9 17 0 8 4
nd6 104 104 0 79 1 0 1 1 0 8 0
pkpcb 40 84 0 84 2 2 0 1 0 8 0
kcovpl 48 31 0 23 1 0 1 1 0 8 0
ppxss 1160 24 0 23 2 1 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 1644 0 1165 48 18 30 30 0 8 0
art_table 32 1645 0 1165 5 1 4 4 0 8 0
art_node 16 432 0 337 1 0 1 1 0 8 0
sysvmsgpl 40 4 0 0 1 0 1 1 0 8 0
semupl 112 4 0 4 1 1 0 1 0 8 0
semapl 112 434 0 424 1 0 1 1 0 8 0
shmpl 112 131 0 3 4 0 4 4 0 8 0
dirhash 1024 31 0 14 3 0 3 3 0 8 0
dino2pl 256 7006 0 5548 92 0 92 92 0 8 0
ffsino 240 7006 0 5548 86 0 86 86 0 8 0
nchpl 144 12736 0 11103 63 0 63 63 0 8 0
uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0
vnodes 216 5926 0 0 330 0 330 330 0 8 0
namei 1024 46413 0 46411 11 10 1 3 0 8 0
vcpupl 2048 98 0 0 13 0 13 13 0 8 0
vmpool 664 109 0 11 10 1 9 9 0 8 0
kstatmem 264 176 0 148 2 0 2 2 0 8 0
scxspl 216 51212 0 51212 22 19 3 8 1 8 3
plimitpl 152 535 0 520 1 0 1 1 0 8 0
sigapl 424 4764 0 4701 8 0 8 8 0 8 0
futexpl 64 38899 0 38898 3 2 1 1 0 8 0
knotepl 120 38132 0 38049 8 3 5 5 0 8 2
kqueuepl 184 870 0 862 18 16 2 4 0 8 1
pipepl 288 940 0 912 24 21 3 7 0 8 0
fdescpl 432 4487 0 4462 5 1 4 4 0 8 0
filepl 120 28303 0 28065 50 39 11 16 0 8 1
lockfpl 104 2032 0 2030 7 6 1 2 0 8 0
lockfspl 48 847 0 845 1 0 1 1 0 8 0
sessionpl 144 49 0 33 1 0 1 1 0 8 0
pgrppl 48 97 0 81 1 0 1 1 0 8 0
ucredpl 104 3104 0 3089 1 0 1 1 0 8 0
zombiepl 144 4702 0 4701 2 1 1 1 0 8 0
processpl 1072 4764 0 4701 5 0 5 5 0 8 0
procpl 680 10738 0 10659 15 7 8 9 0 8 0
sosppl 168 32 0 32 5 4 1 1 0 8 1
sockpl 456 7447 0 7392 191 176 15 30 0 8 6
mcl64k 65536 154 0 154 10 9 1 1 0 8 1
mcl16k 16384 111 0 111 12 12 0 1 0 8 0
mcl12k 12288 196 0 196 11 10 1 1 0 8 1
mcl9k 9216 84 0 84 11 11 0 1 0 8 0
mcl8k 8192 435 0 435 12 11 1 1 0 8 1
mcl4k 4096 468 0 468 14 13 1 3 0 8 1
mcl2k2 2112 29 0 29 12 11 1 1 0 8 1
mcl2k 2048 77695 0 77633 50 41 9 30 0 8 0
mtagpl 96 650 0 385 14 7 7 8 0 8 0
mbufpl 256 172711 0 172274 178 147 31 85 0 8 0
bufpl 288 13044 0 6651 457 0 457 457 0 8 0
anonpl 24 633945 0 620176 166 65 101 119 0 188 0
amapchunkpl 152 130613 0 129863 81 45 36 47 0 158 0
amappl16 200 14747 0 14251 102 75 27 38 0 8 0
amappl15 192 14 0 13 1 0 1 1 0 8 0
amappl14 184 221 0 208 2 1 1 2 0 8 0
amappl13 176 9 0 9 2 2 0 1 0 8 0
amappl12 168 5498 0 5472 2 0 2 2 0 8 0
amappl11 160 46 0 36 1 0 1 1 0 8 0
amappl10 152 53 0 43 1 0 1 1 0 8 0
amappl9 144 175 0 174 1 0 1 1 0 8 0
amappl8 136 300 0 227 3 0 3 3 0 8 0
amappl7 128 223 0 199 2 0 2 2 0 8 0
amappl6 120 583 0 575 1 0 1 1 0 8 0
amappl5 112 200 0 191 1 0 1 1 0 8 0
amappl4 104 603 0 578 2 1 1 2 0 8 0
amappl3 96 25552 0 25483 3 0 3 3 0 8 0
amappl2 88 5182 0 5115 3 1 2 3 0 8 0
amappl1 80 25808 0 25314 22 10 12 22 0 8 0
amappl 88 39351 0 39140 7 1 6 7 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 72 133 0 3 3 0 3 3 0 8 0
uaddrrnd 24 4596 0 4473 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 4596 0 4473 1 0 1 1 0 8 0
vmmpekpl 168 36408 0 36336 4 0 4 4 0 8 0
vmmpepl 168 293922 0 291606 230 98 132 137 0 357 18
vmsppl 368 4595 0 4473 14 2 12 12 0 8 0
rwobjpl 24 80394 0 72842 49 1 48 48 0 8 0
pdppl 4096 9198 0 9044 448 286 162 164 0 8 8
pvpl 32 1565832 0 1546464 355 178 177 338 0 265 0
pmappl 216 4595 0 4473 8 0 8 8 0 8 1
extentpl 40 56 0 38 1 0 1 1 0 8 0
phpool 112 1618 0 693 27 0 27 27 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
ffs2_balloc(fffffd806f286b40,8fda3,45,fffffd807f7d76e8,1,ffff80002bf24ca8) at ffs2_balloc+0x7ae sys/ufs/ffs/ffs_balloc.c:660
ffs_write(ffff80002bf24d40) at ffs_write+0x411 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd80713feb00,ffff80002bf24df0,3,fffffd807f7d76e8) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a679ab0,fffffd80713feb00,fffffd807f7d76e8,ffff80002bf24eb0,ffff80002bf24e90) at ktrwriteraw+0x14a sys/kern/kern_ktrace.c:682
ktrnamei(ffff80002a679ab0,ffff80002a6e2c00) at ktrnamei+0x118 ktrwrite sys/kern/kern_ktrace.c:623 [inline]
ktrnamei(ffff80002a679ab0,ffff80002a6e2c00) at ktrnamei+0x118 sys/kern/kern_ktrace.c:217
namei(ffff80002bf25090) at namei+0x1e4 sys/kern/vfs_lookup.c:170
domkdirat(ffff80002a679ab0,ffffff9c,736775c578b0,1ff) at domkdirat+0x79 sys/kern/vfs_syscalls.c:3058
syscall(ffff80002bf252a0) at syscall+0x5ef sys/arch/amd64/amd64/trap.c:591
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x736775c57920, count: -9
ddb> machine ddbcpu 1
No such command
ddb> trace
ffs2_balloc(fffffd806f286b40,8fda3,45,fffffd807f7d76e8,1,ffff80002bf24ca8) at ffs2_balloc+0x7ae sys/ufs/ffs/ffs_balloc.c:660
ffs_write(ffff80002bf24d40) at ffs_write+0x411 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd80713feb00,ffff80002bf24df0,3,fffffd807f7d76e8) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a679ab0,fffffd80713feb00,fffffd807f7d76e8,ffff80002bf24eb0,ffff80002bf24e90) at ktrwriteraw+0x14a sys/kern/kern_ktrace.c:682
ktrnamei(ffff80002a679ab0,ffff80002a6e2c00) at ktrnamei+0x118 ktrwrite sys/kern/kern_ktrace.c:623 [inline]
ktrnamei(ffff80002a679ab0,ffff80002a6e2c00) at ktrnamei+0x118 sys/kern/kern_ktrace.c:217
namei(ffff80002bf25090) at namei+0x1e4 sys/kern/vfs_lookup.c:170
domkdirat(ffff80002a679ab0,ffffff9c,736775c578b0,1ff) at domkdirat+0x79 sys/kern/vfs_syscalls.c:3058
syscall(ffff80002bf252a0) at syscall+0x5ef sys/arch/amd64/amd64/trap.c:591
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x736775c57920, count: -9
---
This report is generated by a bot. It may contain errors.
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