assert "bp->b_data != NULL" failed in vfs_biomem.c (6)
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syzbot
Dec 9, 2025, 8:41:37 AM (2 days ago) Dec 9
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: bf8f637750de sync
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=15919a1a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=1bc15e68cd2a49e5
dashboard link: https://syzkaller.appspot.com/bug?extid=1013ba996190a6e19685
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ed8ba5807488/disk-bf8f6377.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/86d04e4de645/bsd-bf8f6377.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f8df0913ed04/kernel-bf8f6377.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1013ba...@syzkaller.appspotmail.com
panic: kernel diagnostic assertion "bp->b_data != NULL" failed: file "/syzkaller/managers/main/kernel/sys/kern/vfs_biomem.c", line 235
Stopped at db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*228587 79029 0 0x1000 0x4080000 0 syz-executor
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8337d550) at panic+0x1cf sys/kern/subr_prf.c:198
__assert(ffffffff833b8254,ffffffff8336be8f,eb,ffffffff83388f24) at __assert+0x29 sys/kern/subr_prf.c:-1
buf_unmap(fffffd8069e1c7d0) at buf_unmap+0x20a
buf_map(fffffd8069c19598) at buf_map+0x241 sys/kern/vfs_biomem.c:117
buf_get(fffffd806cb127e8,18a,4000) at buf_get+0x5be sys/kern/vfs_bio.c:1163
getblk(fffffd806cb127e8,18a,4000,0,ffffffffffffffff) at getblk+0x146 sys/kern/vfs_bio.c:-1
ffs2_balloc(fffffd806afd4000,628000,4000,fffffd8007bfd820,2,ffff80002cced718) at ffs2_balloc+0x1778 sys/ufs/ffs/ffs_balloc.c:-1
ffs_write(ffff80002cced7a0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd806cb127e8,ffff80002cced958,7,fffffd8007bfd820) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
vn_write(fffffd80753c2800,ffff80002cced958,0) at vn_write+0x1c2 sys/kern/vfs_vnops.c:408
dofilewritev(ffff80002a7bcfb0,3,ffff80002cced958,0,ffff80002cceda00) at dofilewritev+0x242 sys/kern/sys_generic.c:380
sys_write(ffff80002a7bcfb0,ffff80002ccedab0,ffff80002cceda00) at sys_write+0xa2 sys/kern/sys_generic.c:300
syscall(ffff80002ccedab0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002ccedab0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775
end trace frame: 0xffff80002ccedb30, count: 0
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports. Insufficient info makes it difficult to find and fix bugs.
ddb>
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
*cpu0: kernel diagnostic assertion "bp->b_data != NULL" failed: file "/syzkaller/managers/main/kernel/sys/kern/vfs_biomem.c", line 235
ddb> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8337d550) at panic+0x1cf sys/kern/subr_prf.c:198
__assert(ffffffff833b8254,ffffffff8336be8f,eb,ffffffff83388f24) at __assert+0x29 sys/kern/subr_prf.c:-1
buf_unmap(fffffd8069e1c7d0) at buf_unmap+0x20a
buf_map(fffffd8069c19598) at buf_map+0x241 sys/kern/vfs_biomem.c:117
buf_get(fffffd806cb127e8,18a,4000) at buf_get+0x5be sys/kern/vfs_bio.c:1163
getblk(fffffd806cb127e8,18a,4000,0,ffffffffffffffff) at getblk+0x146 sys/kern/vfs_bio.c:-1
ffs2_balloc(fffffd806afd4000,628000,4000,fffffd8007bfd820,2,ffff80002cced718) at ffs2_balloc+0x1778 sys/ufs/ffs/ffs_balloc.c:-1
ffs_write(ffff80002cced7a0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd806cb127e8,ffff80002cced958,7,fffffd8007bfd820) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
vn_write(fffffd80753c2800,ffff80002cced958,0) at vn_write+0x1c2 sys/kern/vfs_vnops.c:408
dofilewritev(ffff80002a7bcfb0,3,ffff80002cced958,0,ffff80002cceda00) at dofilewritev+0x242 sys/kern/sys_generic.c:380
sys_write(ffff80002a7bcfb0,ffff80002ccedab0,ffff80002cceda00) at sys_write+0xa2 sys/kern/sys_generic.c:300
syscall(ffff80002ccedab0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002ccedab0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x27883e18ac0, count: -15
ddb> show registers
rdi 0
rsi 0x1
rbp 0xffff80002cced0b0
rbx 0xfffffd8069c19501
rdx 0
rcx 0
rax 0xffff80002a7bcfb0
r8 0x101010101010101
r9 0x8080808080808080
r10 0x83c00085054ff883
r11 0x129d39c850f7545d
r12 0
r13 0
r14 0
r15 0x1
rip 0xffffffff8271fba5 db_enter+0x25
cs 0x8
rflags 0x246
rsp 0xffff80002cced0a0
ss 0x10
db_enter+0x25: addq $0x8,%rsp
ddb> show proc
PROC (syz-executor) tid=228587 pid=79029 tcnt=3 stat=onproc
flags process=1000<SINGLEEXIT> proc=4080000<SUSPSINGLE,THREAD>
runpri=17, usrpri=82, slppri=17, nice=20
wchan=0x0, wmesg=, ps_single=0xffff80002a7bc2b8 scnt=2 ecnt=0
forw=0xffffffffffffffff, list=0xffff80002a7bc2b8,0xffff80002a7bd788
process=0xffff80003b519f98 user=0xffff80002cce8000, vmspace=0xfffffd806cb32740
estcpu=32, cpticks=5, pctcpu=0.2, user=0, sys=5, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
79029 257750 22544 0 3 0x3000 suspend syz-executor
*79029 228587 22544 0 7 0x4081000 syz-executor
79029 349536 22544 0 3 0x4081000 inode syz-executor
54329 249648 9804 0 3 0x82 piperd syz-executor
47703 340900 9804 0 3 0x82 piperd syz-executor
4429 124019 0 0 3 0x14280 nfsidl nfsio
18503 440319 0 0 3 0x14280 nfsidl nfsio
83794 219271 0 0 3 0x14280 nfsidl nfsio
65319 146383 0 0 3 0x14280 nfsidl nfsio
56514 147374 0 0 3 0x14280 nfsidl nfsio
92655 165787 0 0 3 0x14280 nfsidl nfsio
43822 494079 0 0 3 0x14280 nfsidl nfsio
71803 248765 0 0 3 0x14280 nfsidl nfsio
60950 180531 0 0 3 0x14280 nfsidl nfsio
76621 9698 0 0 3 0x14280 nfsidl nfsio
83954 495758 0 0 3 0x14280 nfsidl nfsio
13008 229572 0 0 3 0x14280 nfsidl nfsio
3408 503958 0 0 3 0x14280 nfsidl nfsio
93188 176940 0 0 3 0x14280 nfsidl nfsio
39680 333700 0 0 3 0x14280 nfsidl nfsio
49520 510251 0 0 3 0x14280 nfsidl nfsio
60288 252740 0 0 3 0x14280 nfsidl nfsio
48377 352852 0 0 3 0x14280 nfsidl nfsio
13555 261681 0 0 3 0x14280 nfsidl nfsio
45335 258253 0 0 3 0x14280 nfsidl nfsio
13315 422737 9804 0 3 0x82 piperd syz-executor
95780 452572 9804 0 3 0x82 piperd syz-executor
20555 454744 1 0 3 0x100083 ttyin getty
22544 351225 9804 0 3 0x82 nanoslp syz-executor
98579 38742 9804 0 3 0x82 piperd syz-executor
9804 355540 24169 0 3 0x82 nanoslp syz-executor
24169 3054 17132 0 3 0x10008a sigsusp ksh
17132 137337 83968 0 3 0x98 kqread sshd-session
83968 82558 24211 0 3 0x92 kqread sshd-session
24211 407981 1 0 3 0x88 kqread sshd
15289 348033 433 73 3 0x1100090 kqread syslogd
433 354803 1 0 3 0x100082 sbwait syslogd
96472 53377 1 0 3 0x100080 kqread resolvd
20176 501068 39156 77 3 0x100092 kqread dhcpleased
98778 308399 39156 77 3 0x100092 kqread dhcpleased
39156 61783 1 0 3 0x80 kqread dhcpleased
2956 129586 0 0 3 0x14200 bored smr
8446 157742 0 0 3 0x14200 pgzero zerothread
27212 398762 0 0 3 0x14200 aiodoned aiodoned
16819 208643 0 0 3 0x14200 syncer update
92592 381883 0 0 3 0x14200 cleaner cleaner
8698 274425 0 0 3 0x14200 reaper reaper
20898 260846 0 0 3 0x14200 pgdaemon pagedaemon
21432 135250 0 0 3 0x14200 bored viomb
14814 200749 0 0 3 0x40014200 acpi0 acpi0
55602 203532 0 0 3 0x14200 bored softnet0
26971 120362 0 0 3 0x14200 bored systqmp
14083 92378 0 0 3 0x14200 bored systq
88294 450692 0 0 3 0x40014200 tmoslp softclock
19976 211059 0 0 3 0x40014200 idle0
1 185757 0 0 3 0x82 wait init
0 0 -1 0 3 0x10010200 scheduler swapper
ddb> show all locks
No such command
ddb> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10210 11045K 15293K 166960K 14048 0
pcb 17 16K 18K 166960K 468 0
rtable 198 9K 11K 166960K 767 0
pf 33 13K 16K 166960K 194 0
ifaddr 32 5K 8K 166960K 132 0
ifgroup 48 2K 2K 166960K 260 0
sysctl 4 1K 9K 166960K 18 0
counters 35 17K 18K 166960K 188 0
ioctlops 0 0K 4K 166960K 682 0
iov 0 0K 20K 166960K 175 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1498 94K 95K 166960K 3455 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 9K 166960K 24 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 0K 166960K 162 0
dirhash 9 1K 2K 166960K 12 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 10 33K 240K 166960K 1740 0
sigio 0 0K 0K 166960K 86 0
proc 60 59K 124K 166960K 1010 0
subproc 63 3K 4K 166960K 288 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 291 0
in_multi 60 4K 7K 166960K 180 0
ether_multi 1 0K 0K 166960K 19 0
mrt 0 0K 0K 166960K 22 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 283 1261K 1261K 166960K 283 0
exec 0 0K 1K 166960K 732 0
fusefs mount 1 32K 32K 166960K 1 0
pfkey data 0 0K 0K 166960K 4 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 171 142K 170K 166960K 16032 0
UVM aobj 41 8K 10K 166960K 53 0
pinsyscall 31 62K 96K 166960K 3070 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 93 0
NDP 11 0K 1K 166960K 98 0
temp 78 8671K 8800K 166960K 71866 0
kqueue 13 20K 32K 166960K 257 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 120 175 0 172 1 0 1 1 0 8 0
rtentry 136 197 0 131 4 0 4 4 0 8 0
unpcb 144 1225 0 1210 6 0 6 6 0 8 5
syncache 336 9 0 9 2 1 1 1 0 8 1
tcpqe 32 1 0 1 1 1 0 1 0 8 0
tcpcb 736 812 0 807 13 6 7 7 0 8 6
arp 96 33 0 20 1 0 1 1 0 8 0
ipq 40 9 0 3 1 0 1 1 0 8 0
ipqe 40 13 0 7 1 0 1 1 0 8 0
inpcb 328 2187 0 2178 23 14 9 12 0 8 8
ip6q 72 5 0 2 1 0 1 1 0 8 0
ip6af 40 7 0 4 1 0 1 1 0 8 0
nd6 112 46 0 31 1 0 1 1 0 8 0
pkpcb 40 14 0 14 2 1 1 1 0 8 1
kcovpl 48 32 0 25 1 0 1 1 0 8 0
mppekey 1024 2 0 2 1 0 1 1 0 8 1
ppxss 1072 119 0 116 1 0 1 1 0 8 0
pppxif 1384 3 0 3 1 0 1 1 0 8 1
pfstscr 40 1 0 1 1 1 0 1 0 8 0
pfrktable 1344 2 0 2 1 0 1 1 0 8 1
pfstitem 24 2 0 0 1 0 1 1 0 8 0
pfstkey 128 3 0 1 1 0 1 1 0 8 0
pfstate 384 2 0 1 1 0 1 1 0 8 0
pfrule 1344 1 0 1 1 1 0 1 0 8 0
rttmr 136 2 0 2 1 0 1 1 0 8 1
art_heap8 4096 6 0 0 6 0 6 6 0 8 0
art_heap4 256 784 0 477 31 1 30 31 0 8 7
art_table 40 790 0 477 5 0 5 5 0 8 0
art_node 32 193 0 134 1 0 1 1 0 8 0
sysvmsgpl 40 14 0 9 1 0 1 1 0 8 0
semupl 112 5 0 5 2 1 1 1 0 8 1
semapl 112 154 0 144 1 0 1 1 0 8 0
shmpl 112 44 0 9 1 0 1 1 0 8 0
dirhash 1024 17 0 10 3 1 2 3 0 8 0
dino2pl 256 4564 0 3034 96 0 96 96 0 8 0
ffsino 256 4564 0 3034 96 0 96 96 0 8 0
nchpl 144 6790 0 5082 64 0 64 64 0 8 0
rtmask 32 17 0 15 1 0 1 1 0 8 0
vnodes 216 4593 0 0 256 0 256 256 0 8 0
namei 1024 25743 0 25743 3 2 1 2 0 8 1
vcpupl 3904 5 0 2 1 0 1 1 0 8 0
vmpool 800 6 0 3 1 0 1 1 0 8 0
kstatmem 264 148 0 126 2 0 2 2 0 8 0
acpiwqpl 32 1 0 1 1 0 1 1 1 8 1
scsiplug 72 5 0 5 2 1 1 1 0 8 1
scxspl 216 22109 0 22109 15 7 8 8 1 8 8
plimitpl 152 596 0 580 1 0 1 1 0 8 0
sigapl 424 1978 0 1923 9 1 8 8 0 8 0
knotepl 120 55761 0 55714 24 14 10 17 0 8 8
kqueuepl 184 547 0 538 3 0 3 3 0 8 2
pipepl 304 319 0 292 5 2 3 5 0 8 0
fdescpl 448 1944 0 1922 5 1 4 5 0 8 0
filepl 120 14964 0 14774 19 4 15 15 0 8 6
lockfpl 104 745 0 743 2 1 1 2 0 8 0
lockfspl 48 260 0 258 1 0 1 1 0 8 0
sessionpl 144 50 0 42 1 0 1 1 0 8 0
pgrppl 48 102 0 87 1 0 1 1 0 8 0
ucredpl 104 3007 0 2995 1 0 1 1 0 8 0
zombiepl 144 1925 0 1923 1 0 1 1 0 8 0
processpl 1152 1978 0 1923 5 0 5 5 0 8 0
procpl 664 3989 0 3932 8 1 7 7 0 8 0
sosppl 176 7 0 7 2 1 1 1 0 8 1
sockpl 552 3812 0 3785 29 18 11 18 0 8 8
mcl64k 65536 151 0 151 2 1 1 1 0 8 1
mcl9k 9216 1 0 1 1 1 0 1 0 8 0
mcl8k 8192 83 0 83 2 1 1 1 0 8 1
mcl4k 4096 4300 0 4239 15 6 9 14 0 8 1
mcl2k 2048 2351 0 2339 8 5 3 6 0 8 1
mtagpl 96 248 0 130 4 0 4 4 0 8 0
mbufpl 256 20443 0 20167 39 14 25 29 0 8 4
bufpl 280 7907 0 1685 445 0 445 445 0 8 0
bufpl: pool(0xffffffff83966598:bufpl): page inconsistency: page 0x0; at page head addr 0xfffffd8069e1cf90 (p 0xfffffd8069e1c000)
anonpl 24 259207 0 255017 77 20 57 57 0 187 29
amapchunkpl 152 55488 0 55197 49 15 34 36 0 158 14
amappl16 200 3525 0 3404 28 17 11 15 0 8 4
amappl15 192 4 0 4 1 1 0 1 0 8 0
amappl14 184 20 0 20 2 1 1 1 0 8 1
amappl13 176 536 0 535 1 0 1 1 0 8 0
amappl12 168 2340 0 2309 3 1 2 3 0 8 0
amappl11 160 17 0 17 1 1 0 1 0 8 0
amappl10 152 46 0 36 1 0 1 1 0 8 0
amappl9 144 248 0 248 1 1 0 1 0 8 0
amappl8 136 55 0 54 1 0 1 1 0 8 0
amappl7 128 132 0 131 1 0 1 1 0 8 0
amappl6 120 397 0 385 1 0 1 1 0 8 0
amappl5 112 69 0 62 1 0 1 1 0 8 0
amappl4 104 490 0 464 1 0 1 1 0 8 0
amappl3 96 10776 0 10712 5 1 4 4 0 8 1
amappl2 88 670 0 615 2 0 2 2 0 8 0
amappl1 80 17003 0 16503 14 1 13 13 0 8 1
amappl 88 14917 0 14814 5 0 5 5 0 92 0
uvmvnodes 80 151 0 0 4 0 4 4 0 8 0
dma32768 32768 2 0 2 1 0 1 1 0 8 1
dma16384 16384 1 0 1 1 1 0 1 0 8 0
dma8192 8192 2 0 2 2 1 1 1 0 8 1
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma1024 1024 3 0 2 1 0 1 1 0 8 0
dma256 256 6 0 6 1 1 0 1 0 8 0
dma128 128 256 0 256 2 1 1 1 0 8 1
dma64 64 7 0 7 2 1 1 1 0 8 1
dma32 32 7 0 7 1 1 0 1 0 8 0
dma16 16 19 0 18 1 0 1 1 0 8 0
aobjpl 72 52 0 12 1 0 1 1 0 8 0
uaddrrnd 24 1944 0 1922 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 1944 0 1922 1 0 1 1 0 8 0
vmmpekpl 168 15585 0 15537 3 0 3 3 0 8 0
vmmpepl 168 124506 0 123003 96 7 89 89 0 357 10
vmsppl 368 1943 0 1922 4 1 3 4 0 8 0
rwobjpl 40 31411 0 30369 13 0 13 13 0 8 0
pdppl 4096 3907 0 3853 131 65 66 83 0 8 12
pvpl 32 797639 0 789354 171 32 139 139 0 265 51
pmappl 216 1949 0 1925 3 0 3 3 0 8 1
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 464 0 109 11 0 11 11 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8337d550) at panic+0x1cf sys/kern/subr_prf.c:198
__assert(ffffffff833b8254,ffffffff8336be8f,eb,ffffffff83388f24) at __assert+0x29 sys/kern/subr_prf.c:-1
buf_unmap(fffffd8069e1c7d0) at buf_unmap+0x20a
buf_map(fffffd8069c19598) at buf_map+0x241 sys/kern/vfs_biomem.c:117
buf_get(fffffd806cb127e8,18a,4000) at buf_get+0x5be sys/kern/vfs_bio.c:1163
getblk(fffffd806cb127e8,18a,4000,0,ffffffffffffffff) at getblk+0x146 sys/kern/vfs_bio.c:-1
ffs2_balloc(fffffd806afd4000,628000,4000,fffffd8007bfd820,2,ffff80002cced718) at ffs2_balloc+0x1778 sys/ufs/ffs/ffs_balloc.c:-1
ffs_write(ffff80002cced7a0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd806cb127e8,ffff80002cced958,7,fffffd8007bfd820) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
vn_write(fffffd80753c2800,ffff80002cced958,0) at vn_write+0x1c2 sys/kern/vfs_vnops.c:408
dofilewritev(ffff80002a7bcfb0,3,ffff80002cced958,0,ffff80002cceda00) at dofilewritev+0x242 sys/kern/sys_generic.c:380
sys_write(ffff80002a7bcfb0,ffff80002ccedab0,ffff80002cceda00) at sys_write+0xa2 sys/kern/sys_generic.c:300
syscall(ffff80002ccedab0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002ccedab0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x27883e18ac0, count: -15
ddb> machine ddbcpu 1
No such command
ddb> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8337d550) at panic+0x1cf sys/kern/subr_prf.c:198
__assert(ffffffff833b8254,ffffffff8336be8f,eb,ffffffff83388f24) at __assert+0x29 sys/kern/subr_prf.c:-1
buf_unmap(fffffd8069e1c7d0) at buf_unmap+0x20a
buf_map(fffffd8069c19598) at buf_map+0x241 sys/kern/vfs_biomem.c:117
buf_get(fffffd806cb127e8,18a,4000) at buf_get+0x5be sys/kern/vfs_bio.c:1163
getblk(fffffd806cb127e8,18a,4000,0,ffffffffffffffff) at getblk+0x146 sys/kern/vfs_bio.c:-1
ffs2_balloc(fffffd806afd4000,628000,4000,fffffd8007bfd820,2,ffff80002cced718) at ffs2_balloc+0x1778 sys/ufs/ffs/ffs_balloc.c:-1
ffs_write(ffff80002cced7a0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd806cb127e8,ffff80002cced958,7,fffffd8007bfd820) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
vn_write(fffffd80753c2800,ffff80002cced958,0) at vn_write+0x1c2 sys/kern/vfs_vnops.c:408
dofilewritev(ffff80002a7bcfb0,3,ffff80002cced958,0,ffff80002cceda00) at dofilewritev+0x242 sys/kern/sys_generic.c:380
sys_write(ffff80002a7bcfb0,ffff80002ccedab0,ffff80002cceda00) at sys_write+0xa2 sys/kern/sys_generic.c:300
syscall(ffff80002ccedab0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002ccedab0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x27883e18ac0, count: -15
---
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syzbot found the following issue on:
HEAD commit: bf8f637750de sync
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=15919a1a580000
kernel config: https://syzkaller.appspot.com/x/.config?x=1bc15e68cd2a49e5
dashboard link: https://syzkaller.appspot.com/bug?extid=1013ba996190a6e19685
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ed8ba5807488/disk-bf8f6377.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/86d04e4de645/bsd-bf8f6377.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f8df0913ed04/kernel-bf8f6377.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+1013ba...@syzkaller.appspotmail.com
panic: kernel diagnostic assertion "bp->b_data != NULL" failed: file "/syzkaller/managers/main/kernel/sys/kern/vfs_biomem.c", line 235
Stopped at db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*228587 79029 0 0x1000 0x4080000 0 syz-executor
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8337d550) at panic+0x1cf sys/kern/subr_prf.c:198
__assert(ffffffff833b8254,ffffffff8336be8f,eb,ffffffff83388f24) at __assert+0x29 sys/kern/subr_prf.c:-1
buf_unmap(fffffd8069e1c7d0) at buf_unmap+0x20a
buf_map(fffffd8069c19598) at buf_map+0x241 sys/kern/vfs_biomem.c:117
buf_get(fffffd806cb127e8,18a,4000) at buf_get+0x5be sys/kern/vfs_bio.c:1163
getblk(fffffd806cb127e8,18a,4000,0,ffffffffffffffff) at getblk+0x146 sys/kern/vfs_bio.c:-1
ffs2_balloc(fffffd806afd4000,628000,4000,fffffd8007bfd820,2,ffff80002cced718) at ffs2_balloc+0x1778 sys/ufs/ffs/ffs_balloc.c:-1
ffs_write(ffff80002cced7a0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd806cb127e8,ffff80002cced958,7,fffffd8007bfd820) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
vn_write(fffffd80753c2800,ffff80002cced958,0) at vn_write+0x1c2 sys/kern/vfs_vnops.c:408
dofilewritev(ffff80002a7bcfb0,3,ffff80002cced958,0,ffff80002cceda00) at dofilewritev+0x242 sys/kern/sys_generic.c:380
sys_write(ffff80002a7bcfb0,ffff80002ccedab0,ffff80002cceda00) at sys_write+0xa2 sys/kern/sys_generic.c:300
syscall(ffff80002ccedab0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002ccedab0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775
end trace frame: 0xffff80002ccedb30, count: 0
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports. Insufficient info makes it difficult to find and fix bugs.
ddb>
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
*cpu0: kernel diagnostic assertion "bp->b_data != NULL" failed: file "/syzkaller/managers/main/kernel/sys/kern/vfs_biomem.c", line 235
ddb> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8337d550) at panic+0x1cf sys/kern/subr_prf.c:198
__assert(ffffffff833b8254,ffffffff8336be8f,eb,ffffffff83388f24) at __assert+0x29 sys/kern/subr_prf.c:-1
buf_unmap(fffffd8069e1c7d0) at buf_unmap+0x20a
buf_map(fffffd8069c19598) at buf_map+0x241 sys/kern/vfs_biomem.c:117
buf_get(fffffd806cb127e8,18a,4000) at buf_get+0x5be sys/kern/vfs_bio.c:1163
getblk(fffffd806cb127e8,18a,4000,0,ffffffffffffffff) at getblk+0x146 sys/kern/vfs_bio.c:-1
ffs2_balloc(fffffd806afd4000,628000,4000,fffffd8007bfd820,2,ffff80002cced718) at ffs2_balloc+0x1778 sys/ufs/ffs/ffs_balloc.c:-1
ffs_write(ffff80002cced7a0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd806cb127e8,ffff80002cced958,7,fffffd8007bfd820) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
vn_write(fffffd80753c2800,ffff80002cced958,0) at vn_write+0x1c2 sys/kern/vfs_vnops.c:408
dofilewritev(ffff80002a7bcfb0,3,ffff80002cced958,0,ffff80002cceda00) at dofilewritev+0x242 sys/kern/sys_generic.c:380
sys_write(ffff80002a7bcfb0,ffff80002ccedab0,ffff80002cceda00) at sys_write+0xa2 sys/kern/sys_generic.c:300
syscall(ffff80002ccedab0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002ccedab0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x27883e18ac0, count: -15
ddb> show registers
rdi 0
rsi 0x1
rbp 0xffff80002cced0b0
rbx 0xfffffd8069c19501
rdx 0
rcx 0
rax 0xffff80002a7bcfb0
r8 0x101010101010101
r9 0x8080808080808080
r10 0x83c00085054ff883
r11 0x129d39c850f7545d
r12 0
r13 0
r14 0
r15 0x1
rip 0xffffffff8271fba5 db_enter+0x25
cs 0x8
rflags 0x246
rsp 0xffff80002cced0a0
ss 0x10
db_enter+0x25: addq $0x8,%rsp
ddb> show proc
PROC (syz-executor) tid=228587 pid=79029 tcnt=3 stat=onproc
flags process=1000<SINGLEEXIT> proc=4080000<SUSPSINGLE,THREAD>
runpri=17, usrpri=82, slppri=17, nice=20
wchan=0x0, wmesg=, ps_single=0xffff80002a7bc2b8 scnt=2 ecnt=0
forw=0xffffffffffffffff, list=0xffff80002a7bc2b8,0xffff80002a7bd788
process=0xffff80003b519f98 user=0xffff80002cce8000, vmspace=0xfffffd806cb32740
estcpu=32, cpticks=5, pctcpu=0.2, user=0, sys=5, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
79029 257750 22544 0 3 0x3000 suspend syz-executor
*79029 228587 22544 0 7 0x4081000 syz-executor
79029 349536 22544 0 3 0x4081000 inode syz-executor
54329 249648 9804 0 3 0x82 piperd syz-executor
47703 340900 9804 0 3 0x82 piperd syz-executor
4429 124019 0 0 3 0x14280 nfsidl nfsio
18503 440319 0 0 3 0x14280 nfsidl nfsio
83794 219271 0 0 3 0x14280 nfsidl nfsio
65319 146383 0 0 3 0x14280 nfsidl nfsio
56514 147374 0 0 3 0x14280 nfsidl nfsio
92655 165787 0 0 3 0x14280 nfsidl nfsio
43822 494079 0 0 3 0x14280 nfsidl nfsio
71803 248765 0 0 3 0x14280 nfsidl nfsio
60950 180531 0 0 3 0x14280 nfsidl nfsio
76621 9698 0 0 3 0x14280 nfsidl nfsio
83954 495758 0 0 3 0x14280 nfsidl nfsio
13008 229572 0 0 3 0x14280 nfsidl nfsio
3408 503958 0 0 3 0x14280 nfsidl nfsio
93188 176940 0 0 3 0x14280 nfsidl nfsio
39680 333700 0 0 3 0x14280 nfsidl nfsio
49520 510251 0 0 3 0x14280 nfsidl nfsio
60288 252740 0 0 3 0x14280 nfsidl nfsio
48377 352852 0 0 3 0x14280 nfsidl nfsio
13555 261681 0 0 3 0x14280 nfsidl nfsio
45335 258253 0 0 3 0x14280 nfsidl nfsio
13315 422737 9804 0 3 0x82 piperd syz-executor
95780 452572 9804 0 3 0x82 piperd syz-executor
20555 454744 1 0 3 0x100083 ttyin getty
22544 351225 9804 0 3 0x82 nanoslp syz-executor
98579 38742 9804 0 3 0x82 piperd syz-executor
9804 355540 24169 0 3 0x82 nanoslp syz-executor
24169 3054 17132 0 3 0x10008a sigsusp ksh
17132 137337 83968 0 3 0x98 kqread sshd-session
83968 82558 24211 0 3 0x92 kqread sshd-session
24211 407981 1 0 3 0x88 kqread sshd
15289 348033 433 73 3 0x1100090 kqread syslogd
433 354803 1 0 3 0x100082 sbwait syslogd
96472 53377 1 0 3 0x100080 kqread resolvd
20176 501068 39156 77 3 0x100092 kqread dhcpleased
98778 308399 39156 77 3 0x100092 kqread dhcpleased
39156 61783 1 0 3 0x80 kqread dhcpleased
2956 129586 0 0 3 0x14200 bored smr
8446 157742 0 0 3 0x14200 pgzero zerothread
27212 398762 0 0 3 0x14200 aiodoned aiodoned
16819 208643 0 0 3 0x14200 syncer update
92592 381883 0 0 3 0x14200 cleaner cleaner
8698 274425 0 0 3 0x14200 reaper reaper
20898 260846 0 0 3 0x14200 pgdaemon pagedaemon
21432 135250 0 0 3 0x14200 bored viomb
14814 200749 0 0 3 0x40014200 acpi0 acpi0
55602 203532 0 0 3 0x14200 bored softnet0
26971 120362 0 0 3 0x14200 bored systqmp
14083 92378 0 0 3 0x14200 bored systq
88294 450692 0 0 3 0x40014200 tmoslp softclock
19976 211059 0 0 3 0x40014200 idle0
1 185757 0 0 3 0x82 wait init
0 0 -1 0 3 0x10010200 scheduler swapper
ddb> show all locks
No such command
ddb> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10210 11045K 15293K 166960K 14048 0
pcb 17 16K 18K 166960K 468 0
rtable 198 9K 11K 166960K 767 0
pf 33 13K 16K 166960K 194 0
ifaddr 32 5K 8K 166960K 132 0
ifgroup 48 2K 2K 166960K 260 0
sysctl 4 1K 9K 166960K 18 0
counters 35 17K 18K 166960K 188 0
ioctlops 0 0K 4K 166960K 682 0
iov 0 0K 20K 166960K 175 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1498 94K 95K 166960K 3455 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 9K 166960K 24 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 0K 166960K 162 0
dirhash 9 1K 2K 166960K 12 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 10 33K 240K 166960K 1740 0
sigio 0 0K 0K 166960K 86 0
proc 60 59K 124K 166960K 1010 0
subproc 63 3K 4K 166960K 288 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 291 0
in_multi 60 4K 7K 166960K 180 0
ether_multi 1 0K 0K 166960K 19 0
mrt 0 0K 0K 166960K 22 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 283 1261K 1261K 166960K 283 0
exec 0 0K 1K 166960K 732 0
fusefs mount 1 32K 32K 166960K 1 0
pfkey data 0 0K 0K 166960K 4 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 171 142K 170K 166960K 16032 0
UVM aobj 41 8K 10K 166960K 53 0
pinsyscall 31 62K 96K 166960K 3070 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 93 0
NDP 11 0K 1K 166960K 98 0
temp 78 8671K 8800K 166960K 71866 0
kqueue 13 20K 32K 166960K 257 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 120 175 0 172 1 0 1 1 0 8 0
rtentry 136 197 0 131 4 0 4 4 0 8 0
unpcb 144 1225 0 1210 6 0 6 6 0 8 5
syncache 336 9 0 9 2 1 1 1 0 8 1
tcpqe 32 1 0 1 1 1 0 1 0 8 0
tcpcb 736 812 0 807 13 6 7 7 0 8 6
arp 96 33 0 20 1 0 1 1 0 8 0
ipq 40 9 0 3 1 0 1 1 0 8 0
ipqe 40 13 0 7 1 0 1 1 0 8 0
inpcb 328 2187 0 2178 23 14 9 12 0 8 8
ip6q 72 5 0 2 1 0 1 1 0 8 0
ip6af 40 7 0 4 1 0 1 1 0 8 0
nd6 112 46 0 31 1 0 1 1 0 8 0
pkpcb 40 14 0 14 2 1 1 1 0 8 1
kcovpl 48 32 0 25 1 0 1 1 0 8 0
mppekey 1024 2 0 2 1 0 1 1 0 8 1
ppxss 1072 119 0 116 1 0 1 1 0 8 0
pppxif 1384 3 0 3 1 0 1 1 0 8 1
pfstscr 40 1 0 1 1 1 0 1 0 8 0
pfrktable 1344 2 0 2 1 0 1 1 0 8 1
pfstitem 24 2 0 0 1 0 1 1 0 8 0
pfstkey 128 3 0 1 1 0 1 1 0 8 0
pfstate 384 2 0 1 1 0 1 1 0 8 0
pfrule 1344 1 0 1 1 1 0 1 0 8 0
rttmr 136 2 0 2 1 0 1 1 0 8 1
art_heap8 4096 6 0 0 6 0 6 6 0 8 0
art_heap4 256 784 0 477 31 1 30 31 0 8 7
art_table 40 790 0 477 5 0 5 5 0 8 0
art_node 32 193 0 134 1 0 1 1 0 8 0
sysvmsgpl 40 14 0 9 1 0 1 1 0 8 0
semupl 112 5 0 5 2 1 1 1 0 8 1
semapl 112 154 0 144 1 0 1 1 0 8 0
shmpl 112 44 0 9 1 0 1 1 0 8 0
dirhash 1024 17 0 10 3 1 2 3 0 8 0
dino2pl 256 4564 0 3034 96 0 96 96 0 8 0
ffsino 256 4564 0 3034 96 0 96 96 0 8 0
nchpl 144 6790 0 5082 64 0 64 64 0 8 0
rtmask 32 17 0 15 1 0 1 1 0 8 0
vnodes 216 4593 0 0 256 0 256 256 0 8 0
namei 1024 25743 0 25743 3 2 1 2 0 8 1
vcpupl 3904 5 0 2 1 0 1 1 0 8 0
vmpool 800 6 0 3 1 0 1 1 0 8 0
kstatmem 264 148 0 126 2 0 2 2 0 8 0
acpiwqpl 32 1 0 1 1 0 1 1 1 8 1
scsiplug 72 5 0 5 2 1 1 1 0 8 1
scxspl 216 22109 0 22109 15 7 8 8 1 8 8
plimitpl 152 596 0 580 1 0 1 1 0 8 0
sigapl 424 1978 0 1923 9 1 8 8 0 8 0
knotepl 120 55761 0 55714 24 14 10 17 0 8 8
kqueuepl 184 547 0 538 3 0 3 3 0 8 2
pipepl 304 319 0 292 5 2 3 5 0 8 0
fdescpl 448 1944 0 1922 5 1 4 5 0 8 0
filepl 120 14964 0 14774 19 4 15 15 0 8 6
lockfpl 104 745 0 743 2 1 1 2 0 8 0
lockfspl 48 260 0 258 1 0 1 1 0 8 0
sessionpl 144 50 0 42 1 0 1 1 0 8 0
pgrppl 48 102 0 87 1 0 1 1 0 8 0
ucredpl 104 3007 0 2995 1 0 1 1 0 8 0
zombiepl 144 1925 0 1923 1 0 1 1 0 8 0
processpl 1152 1978 0 1923 5 0 5 5 0 8 0
procpl 664 3989 0 3932 8 1 7 7 0 8 0
sosppl 176 7 0 7 2 1 1 1 0 8 1
sockpl 552 3812 0 3785 29 18 11 18 0 8 8
mcl64k 65536 151 0 151 2 1 1 1 0 8 1
mcl9k 9216 1 0 1 1 1 0 1 0 8 0
mcl8k 8192 83 0 83 2 1 1 1 0 8 1
mcl4k 4096 4300 0 4239 15 6 9 14 0 8 1
mcl2k 2048 2351 0 2339 8 5 3 6 0 8 1
mtagpl 96 248 0 130 4 0 4 4 0 8 0
mbufpl 256 20443 0 20167 39 14 25 29 0 8 4
bufpl 280 7907 0 1685 445 0 445 445 0 8 0
bufpl: pool(0xffffffff83966598:bufpl): page inconsistency: page 0x0; at page head addr 0xfffffd8069e1cf90 (p 0xfffffd8069e1c000)
anonpl 24 259207 0 255017 77 20 57 57 0 187 29
amapchunkpl 152 55488 0 55197 49 15 34 36 0 158 14
amappl16 200 3525 0 3404 28 17 11 15 0 8 4
amappl15 192 4 0 4 1 1 0 1 0 8 0
amappl14 184 20 0 20 2 1 1 1 0 8 1
amappl13 176 536 0 535 1 0 1 1 0 8 0
amappl12 168 2340 0 2309 3 1 2 3 0 8 0
amappl11 160 17 0 17 1 1 0 1 0 8 0
amappl10 152 46 0 36 1 0 1 1 0 8 0
amappl9 144 248 0 248 1 1 0 1 0 8 0
amappl8 136 55 0 54 1 0 1 1 0 8 0
amappl7 128 132 0 131 1 0 1 1 0 8 0
amappl6 120 397 0 385 1 0 1 1 0 8 0
amappl5 112 69 0 62 1 0 1 1 0 8 0
amappl4 104 490 0 464 1 0 1 1 0 8 0
amappl3 96 10776 0 10712 5 1 4 4 0 8 1
amappl2 88 670 0 615 2 0 2 2 0 8 0
amappl1 80 17003 0 16503 14 1 13 13 0 8 1
amappl 88 14917 0 14814 5 0 5 5 0 92 0
uvmvnodes 80 151 0 0 4 0 4 4 0 8 0
dma32768 32768 2 0 2 1 0 1 1 0 8 1
dma16384 16384 1 0 1 1 1 0 1 0 8 0
dma8192 8192 2 0 2 2 1 1 1 0 8 1
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma1024 1024 3 0 2 1 0 1 1 0 8 0
dma256 256 6 0 6 1 1 0 1 0 8 0
dma128 128 256 0 256 2 1 1 1 0 8 1
dma64 64 7 0 7 2 1 1 1 0 8 1
dma32 32 7 0 7 1 1 0 1 0 8 0
dma16 16 19 0 18 1 0 1 1 0 8 0
aobjpl 72 52 0 12 1 0 1 1 0 8 0
uaddrrnd 24 1944 0 1922 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 1944 0 1922 1 0 1 1 0 8 0
vmmpekpl 168 15585 0 15537 3 0 3 3 0 8 0
vmmpepl 168 124506 0 123003 96 7 89 89 0 357 10
vmsppl 368 1943 0 1922 4 1 3 4 0 8 0
rwobjpl 40 31411 0 30369 13 0 13 13 0 8 0
pdppl 4096 3907 0 3853 131 65 66 83 0 8 12
pvpl 32 797639 0 789354 171 32 139 139 0 265 51
pmappl 216 1949 0 1925 3 0 3 3 0 8 1
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 464 0 109 11 0 11 11 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8337d550) at panic+0x1cf sys/kern/subr_prf.c:198
__assert(ffffffff833b8254,ffffffff8336be8f,eb,ffffffff83388f24) at __assert+0x29 sys/kern/subr_prf.c:-1
buf_unmap(fffffd8069e1c7d0) at buf_unmap+0x20a
buf_map(fffffd8069c19598) at buf_map+0x241 sys/kern/vfs_biomem.c:117
buf_get(fffffd806cb127e8,18a,4000) at buf_get+0x5be sys/kern/vfs_bio.c:1163
getblk(fffffd806cb127e8,18a,4000,0,ffffffffffffffff) at getblk+0x146 sys/kern/vfs_bio.c:-1
ffs2_balloc(fffffd806afd4000,628000,4000,fffffd8007bfd820,2,ffff80002cced718) at ffs2_balloc+0x1778 sys/ufs/ffs/ffs_balloc.c:-1
ffs_write(ffff80002cced7a0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd806cb127e8,ffff80002cced958,7,fffffd8007bfd820) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
vn_write(fffffd80753c2800,ffff80002cced958,0) at vn_write+0x1c2 sys/kern/vfs_vnops.c:408
dofilewritev(ffff80002a7bcfb0,3,ffff80002cced958,0,ffff80002cceda00) at dofilewritev+0x242 sys/kern/sys_generic.c:380
sys_write(ffff80002a7bcfb0,ffff80002ccedab0,ffff80002cceda00) at sys_write+0xa2 sys/kern/sys_generic.c:300
syscall(ffff80002ccedab0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002ccedab0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x27883e18ac0, count: -15
ddb> machine ddbcpu 1
No such command
ddb> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8337d550) at panic+0x1cf sys/kern/subr_prf.c:198
__assert(ffffffff833b8254,ffffffff8336be8f,eb,ffffffff83388f24) at __assert+0x29 sys/kern/subr_prf.c:-1
buf_unmap(fffffd8069e1c7d0) at buf_unmap+0x20a
buf_map(fffffd8069c19598) at buf_map+0x241 sys/kern/vfs_biomem.c:117
buf_get(fffffd806cb127e8,18a,4000) at buf_get+0x5be sys/kern/vfs_bio.c:1163
getblk(fffffd806cb127e8,18a,4000,0,ffffffffffffffff) at getblk+0x146 sys/kern/vfs_bio.c:-1
ffs2_balloc(fffffd806afd4000,628000,4000,fffffd8007bfd820,2,ffff80002cced718) at ffs2_balloc+0x1778 sys/ufs/ffs/ffs_balloc.c:-1
ffs_write(ffff80002cced7a0) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd806cb127e8,ffff80002cced958,7,fffffd8007bfd820) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
vn_write(fffffd80753c2800,ffff80002cced958,0) at vn_write+0x1c2 sys/kern/vfs_vnops.c:408
dofilewritev(ffff80002a7bcfb0,3,ffff80002cced958,0,ffff80002cceda00) at dofilewritev+0x242 sys/kern/sys_generic.c:380
sys_write(ffff80002a7bcfb0,ffff80002ccedab0,ffff80002cceda00) at sys_write+0xa2 sys/kern/sys_generic.c:300
syscall(ffff80002ccedab0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002ccedab0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x27883e18ac0, count: -15
---
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