panic:W ARpNooIlNG_:c aSchPeL_i NtOemT_ mLOagWEiRc_EDc heONck S: YSCmAbLufLp l2 -cp1u 5f7r3e3e84 5li9s0 tE mXoITdi f0i ea
d
: Stopped at savectx+0xb1: movl $0,%gs:0x530
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*498732 93764 0 0x2 0 0 syz-executor.0
119508 4840 0 0x12 0 1 sshd
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffee290, count: 14
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports. Insufficient info makes it difficult to find and fix bugs.
ddb{0}>
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd8062d4c700+16 0x0!=0x901259ca266d3bfe
ddb{0}> trace
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffee290, count: -1
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff800021bc1a10
rbx 0
rdx 0xffff800020ac8780
rcx 0
rax 0x3b
r8 0xffffffff816b7fbf kprintf+0x16f
r9 0x1
r10 0x25
r11 0xab4b97ed7376b3a2
r12 0
r13 0
r14 0xffff800020ac8780
r15 0
rip 0xffffffff819f03f1 savectx+0xb1
cs 0x8
rflags 0x46
rsp 0xffff800021bc1990
ss 0x10
savectx+0xb1: movl $0,%gs:0x530
ddb{0}> show proc
PROC (syz-executor.0) pid=498732 stat=onproc
flags process=2<EXEC> proc=0
pri=78, usrpri=78, nice=20
forw=0xffffffffffffffff, list=0xffff800020ac9650,0xffff800020ac8a08
process=0xffff800020af4000 user=0xffff800021bbc000, vmspace=0xfffffd807f000b80
estcpu=28, cpticks=1, pctcpu=0.9
user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
78013 58007 93764 0 2 0 syz-executor.0
*93764 498732 71685 0 7 0x2 syz-executor.0
48842 75633 0 0 3 0x14200 bored sosplice
99901 392723 71685 0 3 0x2 biowait syz-executor.1
71685 381281 92223 0 2 0x2 syz-fuzzer
71685 350086 92223 0 3 0x4000082 nanosleep syz-fuzzer
71685 138712 92223 0 3 0x4000082 nanosleep syz-fuzzer
71685 387292 92223 0 3 0x4000082 thrsleep syz-fuzzer
71685 324624 92223 0 3 0x4000082 thrsleep syz-fuzzer
71685 326038 92223 0 3 0x4000082 thrsleep syz-fuzzer
71685 403529 92223 0 3 0x4000082 thrsleep syz-fuzzer
71685 163443 92223 0 3 0x4000082 thrsleep syz-fuzzer
71685 435176 92223 0 3 0x4000082 thrsleep syz-fuzzer
71685 212799 92223 0 3 0x4000082 thrsleep syz-fuzzer
92223 382472 4840 0 3 0x10008a pause ksh
4840 119508 19201 0 7 0x12 sshd
66208 429893 1 0 3 0x100083 ttyin getty
19201 119176 1 0 3 0x80 select sshd
34021 236147 8623 74 3 0x100092 bpf pflogd
8623 518199 1 0 3 0x80 netio pflogd
6329 3801 84119 73 3 0x100090 kqread syslogd
84119 150059 1 0 3 0x100082 netio syslogd
18814 228474 0 0 3 0x14200 pgzero zerothread
46264 74051 0 0 3 0x14200 aiodoned aiodoned
87045 136013 0 0 3 0x14200 syncer update
94322 297482 0 0 3 0x14200 cleaner cleaner
50616 393128 0 0 3 0x14200 reaper reaper
56208 136776 0 0 3 0x14200 pgdaemon pagedaemon
26871 169921 0 0 3 0x14200 bored crynlk
90966 139339 0 0 3 0x14200 bored crypto
65542 389620 0 0 3 0x40014200 acpi0 acpi0
34515 120686 0 0 3 0x40014200 idle1
26439 41892 0 0 3 0x14200 bored softnet
44076 171908 0 0 3 0x14200 bored systqmp
84765 366182 0 0 3 0x14200 bored systq
5159 44906 0 0 3 0x40014200 bored softclock
60763 517590 0 0 3 0x40014200 idle0
58260 26301 0 0 3 0x14200 bored smr
1 34627 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff82645368)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 uvm_pmr_getpages+0x34e sys/uvm/uvm_pmemrange.c:941
#4 uvm_pglistalloc+0x362 sys/uvm/uvm_page.c:790
#5 uvm_km_kmemalloc_pla+0x238 sys/uvm/uvm_km.c:366
#6 uvm_uarea_alloc+0x51 sys/uvm/uvm_glue.c:274
#7 fork1+0x295 sys/kern/kern_fork.c:365
#8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#9 Xsyscall+0x128
Process 93764 (syz-executor.0) thread 0xffff800020ac8780 (498732)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82663c50)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 syscall+0x400 mi_syscall sys/sys/syscall_mi.h:83 [inline]
#1 syscall+0x400 sys/arch/amd64/amd64/trap.c:570
#2 Xsyscall+0x128
exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff82645368)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 uvm_pmr_getpages+0x34e sys/uvm/uvm_pmemrange.c:941
#4 uvm_pglistalloc+0x362 sys/uvm/uvm_page.c:790
#5 uvm_km_kmemalloc_pla+0x238 sys/uvm/uvm_km.c:366
#6 uvm_uarea_alloc+0x51 sys/uvm/uvm_glue.c:274
#7 fork1+0x295 sys/kern/kern_fork.c:365
#8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#9 Xsyscall+0x128
Process 99901 (syz-executor.1) thread 0xffff800020ac8290 (392723)
exclusive rrwlock inode r = 0 (0xfffffd80664e42c0)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 rw_enter+0x453 sys/kern/kern_rwlock.c:309
#2 rrw_enter+0x88 sys/kern/kern_rwlock.c:453
#3 VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615
#4 vn_lock+0x81 sys/kern/vfs_vnops.c:571
#5 vget+0x1c8 sys/kern/vfs_subr.c:671
#6 ufs_ihashget+0x141 sys/ufs/ufs/ufs_ihash.c:119
#7 ffs_vget+0x74 sys/ufs/ffs/ffs_vfsops.c:1323
#8 ufs_lookup+0x14b7 sys/ufs/ufs/ufs_lookup.c:487
#9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:91
#10 vfs_lookup+0x7a6 sys/kern/vfs_lookup.c:568
#11 namei+0x63c sys/kern/vfs_lookup.c:249
#12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1776
#13 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#13 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#14 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd806acab4d8)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 rw_enter+0x453 sys/kern/kern_rwlock.c:309
#2 rrw_enter+0x88 sys/kern/kern_rwlock.c:453
#3 VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615
#4 vn_lock+0x81 sys/kern/vfs_vnops.c:571
#5 vfs_lookup+0xe6 sys/kern/vfs_lookup.c:419
#6 namei+0x63c sys/kern/vfs_lookup.c:249
#7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1776
#8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#9 Xsyscall+0x128
Process 4840 (sshd) thread 0xffff800020ad9b38 (119508)
exclusive rwlock netlock r = 0 (0xffffffff824f5708)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 solock+0x5a sys/kern/uipc_socket2.c:282
#2 sosend+0x559 sys/kern/uipc_socket.c:537
#3 dofilewritev+0x1b7 sys/kern/sys_generic.c:364
#4 sys_write+0x83 sys/kern/sys_generic.c:284
#5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#6 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 9504 6344K 7249K 78643K 11304 0
pcb 13 8K 8K 78643K 63 0
rtable 104 3K 4K 78643K 362 0
ifaddr 69 14K 14K 78643K 160 0
counters 39 33K 33K 78643K 39 0
ioctlops 0 0K 4K 78643K 1491 0
iov 0 0K 16K 78643K 45 0
mount 1 1K 1K 78643K 1 0
vnodes 1224 77K 77K 78643K 1436 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 5K 78643K 7 0
VM map 2 1K 1K 78643K 2 0
sem 12 0K 0K 78643K 45 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1809 196K 290K 78643K 12766 0
file desc 5 13K 25K 78643K 280 0
sigio 0 0K 0K 78643K 13 0
proc 56 51K 95K 78643K 523 0
subproc 32 2K 2K 78643K 51 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 20 0
in_multi 57 3K 3K 78643K 118 0
ether_multi 1 0K 0K 78643K 5 0
mrt 1 0K 0K 78643K 3 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 55 254K 254K 78643K 55 0
exec 0 0K 1K 78643K 252 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 117 87K 87K 78643K 1940 0
UVM aobj 16 5K 5K 78643K 18 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 36 0
NDP 11 0K 0K 78643K 38 0
temp 111 3014K 3079K 78643K 18335 0
kqueue 3 4K 26K 78643K 32 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
arp 64 9 0 3 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 80 43 0 43 1 0 1 1 0 8 1
rtentry 112 77 0 35 2 0 2 2 0 8 0
unpcb 120 244 0 235 1 0 1 1 0 8 0
syncache 264 6 0 6 2 2 0 1 0 8 0
tcpqe 32 36 0 36 1 1 0 1 0 8 0
tcpcb 544 65 0 61 1 0 1 1 0 8 0
inpcb 280 657 0 653 3 0 3 3 0 8 2
rttmr 72 1 0 1 1 1 0 1 0 8 0
nd6 48 11 0 8 1 0 1 1 0 8 0
pkpcb 40 4 0 4 1 0 1 1 0 8 1
ppxss 1128 10 0 10 1 0 1 1 0 8 1
pffrag 232 4 0 4 1 0 1 1 0 482 1
pffrnode 88 4 0 4 1 0 1 1 0 8 1
pffrent 40 180 0 180 1 0 1 1 0 8 1
pfosfp 40 846 0 423 5 0 5 5 0 8 0
pfosfpen 112 1428 0 714 21 0 21 21 0 8 0
pfstitem 24 32 0 5 1 0 1 1 0 8 0
pfstkey 112 32 0 5 1 0 1 1 0 8 0
pfstate 328 32 0 5 3 0 3 3 0 8 0
pfrule 1360 21 0 16 2 1 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 379 0 179 15 1 14 15 0 8 1
art_table 32 380 0 179 2 0 2 2 0 8 0
art_node 16 76 0 37 1 0 1 1 0 8 0
sysvmsgpl 40 37 0 21 1 0 1 1 0 8 0
semupl 112 2 0 2 1 1 0 1 0 8 0
semapl 112 43 0 33 1 0 1 1 0 8 0
shmpl 112 16 0 2 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino1pl 128 1804 0 399 46 0 46 46 0 8 0
ffsino 272 1804 0 399 95 0 95 95 0 8 0
nchpl 144 2412 0 810 61 0 61 61 0 8 0
uvmvnodes 72 2010 0 0 37 0 37 37 0 8 0
vnodes 208 2010 0 0 106 0 106 106 0 8 0
namei 1024 6892 0 6892 1 0 1 1 0 8 1
percpumem 16 30 0 0 1 0 1 1 0 8 0
vcpupl 1984 7 0 0 1 0 1 1 0 8 0
vmpool 560 7 0 0 1 0 1 1 0 8 0
scxspl 192 7317 0 7316 8 6 2 7 0 8 1
plimitpl 152 34 0 27 1 0 1 1 0 8 0
sigapl 432 476 0 463 3 1 2 3 0 8 0
futexpl 56 5103 0 5103 1 0 1 1 0 8 1
knotepl 112 155 0 136 3 2 1 3 0 8 0
kqueuepl 104 70 0 68 1 0 1 1 0 8 0
pipelkpl 48 142 0 132 1 0 1 1 0 8 0
pipepl 120 284 0 265 2 1 1 2 0 8 0
fdescpl 496 477 0 463 3 0 3 3 0 8 0
filepl 152 3448 0 3359 6 1 5 6 0 8 1
lockfpl 104 85 0 85 1 0 1 1 0 8 1
lockfspl 48 34 0 34 1 0 1 1 0 8 1
sessionpl 112 19 0 10 1 0 1 1 0 8 0
pgrppl 48 29 0 20 1 0 1 1 0 8 0
ucredpl 96 416 0 408 1 0 1 1 0 8 0
zombiepl 144 463 0 463 1 0 1 1 0 8 1
processpl 896 493 0 463 4 0 4 4 0 8 0
procpl 632 1095 0 1056 6 1 5 5 0 8 1
srpgc 64 2 0 2 1 1 0 1 0 8 0
sosppl 128 8 0 8 2 1 1 1 0 8 1
sockpl 400 948 0 935 5 0 5 5 0 8 2
mcl64k 65536 5 0 0 1 0 1 1 0 8 0
mcl12k 12288 2 0 0 1 0 1 1 0 8 0
mcl9k 9216 3 0 0 1 0 1 1 0 8 0
mcl8k 8192 5 0 0 1 0 1 1 0 8 0
mcl4k 4096 6 0 0 1 0 1 1 0 8 0
mcl2k 2048 171 0 0 21 0 21 21 0 8 0
mtagpl 80 15 0 0 1 0 1 1 0 8 0
mbufpl 256 263 0 0 16 0 16 16 0 8 0
bufpl 280 7257 0 1344 423 0 423 423 0 8 0
anonpl 16 65046 0 49713 66 1 65 65 0 125 1
amapchunkpl 152 2616 0 2493 8 1 7 8 0 158 1
amappl16 192 2329 0 1492 55 8 47 54 0 8 4
amappl15 184 61 0 58 1 0 1 1 0 8 0
amappl14 176 35 0 32 1 0 1 1 0 8 0
amappl12 160 60 0 59 2 1 1 1 0 8 0
amappl11 152 183 0 173 1 0 1 1 0 8 0
amappl10 144 22 0 16 1 0 1 1 0 8 0
amappl9 136 617 0 613 1 0 1 1 0 8 0
amappl8 128 129 0 106 1 0 1 1 0 8 0
amappl7 120 110 0 98 1 0 1 1 0 8 0
amappl6 112 184 0 175 1 0 1 1 0 8 0
amappl5 104 193 0 181 1 0 1 1 0 8 0
amappl4 96 733 0 705 1 0 1 1 0 8 0
amappl3 88 142 0 135 1 0 1 1 0 8 0
amappl2 80 2829 0 2768 3 1 2 3 0 8 0
amappl1 72 20795 0 20392 26 16 10 21 0 8 0
amappl 80 1374 0 1333 2 0 2 2 0 84 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma256 256 6 0 6 1 1 0 1 0 8 0
dma128 128 253 0 253 1 1 0 1 0 8 0
dma64 64 6 0 6 1 1 0 1 0 8 0
dma32 32 7 0 7 1 1 0 1 0 8 0
dma16 16 18 0 17 1 0 1 1 0 8 0
aobjpl 64 17 0 2 1 0 1 1 0 8 0
uaddrrnd 24 484 0 463 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 484 0 463 1 0 1 1 0 8 0
vmmpekpl 168 7781 0 7741 2 0 2 2 0 8 0
vmmpepl 168 66539 0 64629 124 10 114 120 0 357 23
vmsppl 368 483 0 463 2 0 2 2 0 8 0
pdppl 4096 975 0 933 6 0 6 6 0 8 0
pvpl 32 205701 0 187304 161 3 158 161 0 265 4
pmappl 232 483 0 463 3 1 2 2 0 8 0
extentpl 40 46 0 29 1 0 1 1 0 8 0
phpool 112 173 0 4 5 0 5 5 0 8 0