panic: WpAooRNlI_cNGa:c hSePL_ iNtOeTm _LmOWaEgiRcED_ chONec SkY: SCmAbLuLf pl2 c1p1u3 f6r36ee26 5l iEsXtI Tmo 0d iaf
i
edStopped at savectx+0xb1: movl $0,%gs:0x530
TID PID UID PRFLAGS PFLAGS CPU COMMAND
* 36727 48147 0 0x2 0 0 syz-executor.1
191943 5995 0 0x12 0 1 sshd
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffe5c70, 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 0xfffffd8078a16100+24 0xc5973557ef036256!=0xc59735d785a5ed56
ddb{0}> trace
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffe5c70, count: -1
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff800023109660
rbx 0
rdx 0x8b
rcx 0x2
rax 0x39
r8 0xffffffff81d0e5bf kprintf+0x16f
r9 0x1
r10 0x2
r11 0x762cc7a64e0c9da4
r12 0
r13 0
r14 0xffff800020e23d58
r15 0
rip 0xffffffff81ad63f1 savectx+0xb1
cs 0x8
rflags 0x46
rsp 0xffff8000231095e0
ss 0x10
savectx+0xb1: movl $0,%gs:0x530
ddb{0}> show proc
PROC (syz-executor.1) pid=36727 stat=onproc
flags process=2<EXEC,8ORPHAN> proc=0
pri=74, usrpri=74, nice=20
forw=0xffffffffffffffff, list=0xffff800020ddc4e8,0xffff800020e22028
process=0xffff800020df0f70 user=0xffff800023104000, vmspace=0xfffffd807efffb80
estcpu=36, cpticks=1, pctcpu=0.6
user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
78959 393410 48147 0 2 0 syz-executor.1
7673 387197 63332 0 3 0x82 nanosleep syz-executor.0
31436 218863 0 0 3 0x14200 bored sosplice
*48147 36727 63332 0 7 0x2 syz-executor.1
63332 272848 68338 0 3 0x82 thrsleep syz-fuzzer
63332 13029 68338 0 3 0x4000082 nanosleep syz-fuzzer
63332 197626 68338 0 3 0x4000082 thrsleep syz-fuzzer
63332 512303 68338 0 3 0x4000082 thrsleep syz-fuzzer
63332 460232 68338 0 3 0x4000082 thrsleep syz-fuzzer
63332 257779 68338 0 3 0x4000082 kqread syz-fuzzer
63332 338244 68338 0 3 0x4000082 thrsleep syz-fuzzer
63332 253529 68338 0 3 0x4000082 thrsleep syz-fuzzer
63332 194586 68338 0 3 0x4000082 thrsleep syz-fuzzer
63332 328902 68338 0 3 0x4000082 thrsleep syz-fuzzer
68338 174024 5995 0 3 0x10008a pause ksh
5995 191943 22728 0 7 0x12 sshd
3042 470114 1 0 3 0x100083 ttyin getty
22728 264443 1 0 3 0x80 select sshd
76290 280932 80771 74 3 0x100092 bpf pflogd
80771 103594 1 0 3 0x80 netio pflogd
60946 243532 69626 73 3 0x100090 kqread syslogd
69626 438210 1 0 3 0x100082 netio syslogd
66742 520012 1 77 3 0x100090 poll dhclient
7432 369621 1 0 3 0x80 poll dhclient
73576 100284 0 0 3 0x14200 bored smr
97975 193002 0 0 2 0x14200 zerothread
85331 144080 0 0 3 0x14200 aiodoned aiodoned
11662 438995 0 0 3 0x14200 syncer update
88173 390709 0 0 3 0x14200 cleaner cleaner
17426 6938 0 0 3 0x14200 reaper reaper
18970 296298 0 0 3 0x14200 pgdaemon pagedaemon
59226 451327 0 0 3 0x14200 bored crynlk
53369 93521 0 0 3 0x14200 bored crypto
51813 167224 0 0 3 0x40014200 acpi0 acpi0
25561 409461 0 0 3 0x40014200 idle1
15954 352621 0 0 3 0x14200 bored softnet
98482 27694 0 0 3 0x14200 bored systqmp
98105 442788 0 0 3 0x14200 bored systq
45161 347965 0 0 3 0x40014200 bored softclock
45562 199454 0 0 3 0x40014200 idle0
1 428962 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex vmmpekpl r = 0 (0xffffffff828d6880)
#0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 pool_get+0xbf sys/kern/subr_pool.c:578
#4 uvm_mapent_alloc+0x374 sys/uvm/uvm_map.c:1745
#5 uvm_map+0x2a4 sys/uvm/uvm_map.c:1227
#6 uvm_km_kmemalloc_pla+0x11d sys/uvm/uvm_km.c:335
#7 uvm_uarea_alloc+0x51 sys/uvm/uvm_glue.c:274
#8 fork1+0x271 sys/kern/kern_fork.c:365
#9 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#9 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#10 Xsyscall+0x128
Process 48147 (syz-executor.1) thread 0xffff800020e23d58 (36727)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8291b2d8)
#0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164
#1 syscall+0x400 mi_syscall sys/sys/syscall_mi.h:93 [inline]
#1 syscall+0x400 sys/arch/amd64/amd64/trap.c:570
#2 Xsyscall+0x128
exclusive mutex vmmpekpl r = 0 (0xffffffff828d6880)
#0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 pool_get+0xbf sys/kern/subr_pool.c:578
#4 uvm_mapent_alloc+0x374 sys/uvm/uvm_map.c:1745
#5 uvm_map+0x2a4 sys/uvm/uvm_map.c:1227
#6 uvm_km_kmemalloc_pla+0x11d sys/uvm/uvm_km.c:335
#7 uvm_uarea_alloc+0x51 sys/uvm/uvm_glue.c:274
#8 fork1+0x271 sys/kern/kern_fork.c:365
#9 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#9 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#10 Xsyscall+0x128
Process 5995 (sshd) thread 0xffff800020e41d50 (191943)
exclusive rwlock netlock r = 0 (0xffffffff8270da88)
#0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164
#1 solock+0x5a sys/kern/uipc_socket2.c:282
#2 sosend+0x559 sys/kern/uipc_socket.c:543
#3 dofilewritev+0x1b6 sys/kern/sys_generic.c:365
#4 sys_write+0x83 sys/kern/sys_generic.c:285
#5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [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 9527 6419K 6795K 78643K 11033 0
pcb 13 8K 8K 78643K 77 0
rtable 94 4K 6K 78643K 407 0
ifaddr 72 13K 15K 78643K 149 0
counters 43 33K 34K 78643K 57 0
ioctlops 0 0K 4K 78643K 1510 0
iov 0 0K 12K 78643K 27 0
mount 1 1K 1K 78643K 1 0
vnodes 1217 77K 77K 78643K 1355 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 5K 78643K 5 0
VM map 2 1K 1K 78643K 2 0
sem 12 0K 0K 78643K 39 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1824 197K 290K 78643K 13058 0
file desc 5 13K 25K 78643K 322 0
proc 61 63K 95K 78643K 514 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 18 0
in_multi 41 2K 2K 78643K 130 0
ether_multi 1 0K 0K 78643K 7 0
mrt 0 0K 0K 78643K 4 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 49 228K 228K 78643K 49 0
exec 0 0K 1K 78643K 248 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 123 39K 53K 78643K 2098 0
UVM aobj 15 2K 2K 78643K 19 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 56 0
NDP 15 0K 0K 78643K 35 0
temp 98 3861K 3928K 78643K 5189 0
kqueue 3 4K 9K 78643K 15 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 5 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 80 39 0 37 1 0 1 1 0 8 0
rtentry 112 88 0 51 2 0 2 2 0 8 0
unpcb 120 185 0 175 1 0 1 1 0 8 0
syncache 264 8 0 8 3 3 0 1 0 8 0
tcpqe 32 775 0 775 2 2 0 1 0 8 0
tcpcb 544 138 0 134 2 0 2 2 0 8 1
inpcb 296 408 0 401 3 0 3 3 0 8 2
rttmr 72 1 0 1 1 1 0 1 0 8 0
nd6 48 25 0 21 1 0 1 1 0 8 0
pkpcb 40 2 0 2 1 1 0 1 0 8 0
ppxss 1128 2 0 2 1 1 0 1 0 8 0
pffrag 232 4 0 3 2 1 1 1 0 482 0
pffrnode 88 4 0 3 2 1 1 1 0 8 0
pffrent 40 51 0 50 2 1 1 1 0 8 0
pfosfp 40 847 0 423 5 0 5 5 0 8 0
pfosfpen 112 1429 0 714 21 0 21 21 0 8 0
pfrktable 1344 21 0 21 2 1 1 1 0 8 1
pfstitem 24 38 0 7 1 0 1 1 0 8 0
pfstkey 112 38 0 7 1 0 1 1 0 8 0
pfstate 328 38 0 7 3 0 3 3 0 8 0
pfrule 1360 27 0 21 2 1 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 260 0 88 12 0 12 12 0 8 0
art_table 32 261 0 88 2 0 2 2 0 8 0
art_node 16 87 0 53 1 0 1 1 0 8 0
sysvmsgpl 40 10 0 7 2 1 1 1 0 8 0
semupl 112 1 0 1 1 1 0 1 0 8 0
semapl 112 37 0 27 1 0 1 1 0 8 0
shmpl 112 17 0 4 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1838 0 434 89 0 89 89 0 8 0
ffsino 272 1838 0 434 95 0 95 95 0 8 0
nchpl 144 2535 0 940 60 0 60 60 0 8 0
uvmvnodes 72 1978 0 0 36 0 36 36 0 8 0
vnodes 208 1978 0 0 105 0 105 105 0 8 0
namei 1024 7168 0 7168 1 0 1 1 0 8 1
percpumem 16 39 0 7 1 0 1 1 0 8 0
vcpupl 1984 2 0 0 1 0 1 1 0 8 0
vmpool 560 2 0 0 1 0 1 1 0 8 0
pfiaddrpl 120 5 0 5 2 1 1 1 0 8 1
scxspl 192 7215 0 7215 10 7 3 7 0 8 3
plimitpl 152 35 0 27 1 0 1 1 0 8 0
sigapl 424 535 0 503 4 0 4 4 0 8 0
futexpl 56 4311 0 4311 1 0 1 1 0 8 1
knotepl 112 86 0 67 1 0 1 1 0 8 0
kqueuepl 144 42 0 40 1 0 1 1 0 8 0
pipepl 304 115 0 105 2 1 1 2 0 8 0
fdescpl 496 519 0 503 3 0 3 3 0 8 0
filepl 152 3155 0 3055 5 0 5 5 0 8 1
lockfpl 104 37 0 36 1 0 1 1 0 8 0
lockfspl 48 14 0 13 1 0 1 1 0 8 0
sessionpl 112 19 0 8 1 0 1 1 0 8 0
pgrppl 48 28 0 16 1 0 1 1 0 8 0
ucredpl 96 338 0 329 1 0 1 1 0 8 0
zombiepl 144 503 0 502 1 0 1 1 0 8 0
processpl 984 535 0 502 5 0 5 5 0 8 0
procpl 624 1209 0 1167 5 0 5 5 0 8 1
sosppl 128 6 0 6 2 1 1 1 0 8 1
sockpl 400 635 0 616 6 1 5 5 0 8 3
mcl64k 65536 5 0 0 1 0 1 1 0 8 0
mcl16k 16384 1 0 0 1 0 1 1 0 8 0
mcl12k 12288 5 0 0 1 0 1 1 0 8 0
mcl9k 9216 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 4 0 0 1 0 1 1 0 8 0
mcl4k 4096 9 0 0 2 0 2 2 0 8 0
mcl2k2 2112 1 0 0 1 0 1 1 0 8 0
mcl2k 2048 231 0 0 28 0 28 28 0 8 0
mtagpl 96 25 0 0 1 0 1 1 0 8 0
mbufpl 256 266 0 0 16 0 16 16 0 8 0
bufpl 280 3895 0 133 269 0 269 269 0 8 0
anonpl 16 63394 0 50680 79 8 71 78 0 124 3
amapchunkpl 152 3283 0 3140 18 5 13 13 0 158 6
amappl16 192 2201 0 1318 54 8 46 54 0 8 1
amappl15 184 281 0 276 1 0 1 1 0 8 0
amappl14 176 22 0 19 1 0 1 1 0 8 0
amappl13 168 35 0 32 1 0 1 1 0 8 0
amappl12 160 13 0 10 1 0 1 1 0 8 0
amappl11 152 203 0 187 1 0 1 1 0 8 0
amappl10 144 22 0 14 1 0 1 1 0 8 0
amappl9 136 385 0 383 1 0 1 1 0 8 0
amappl8 128 393 0 356 2 0 2 2 0 8 0
amappl7 120 125 0 112 1 0 1 1 0 8 0
amappl6 112 32 0 24 1 0 1 1 0 8 0
amappl5 104 428 0 411 1 0 1 1 0 8 0
amappl4 96 515 0 480 1 0 1 1 0 8 0
amappl3 88 110 0 105 1 0 1 1 0 8 0
amappl2 80 3420 0 3355 2 0 2 2 0 8 0
amappl1 72 21344 0 20918 23 13 10 18 0 8 0
amappl 80 1538 0 1496 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 18 0 4 1 0 1 1 0 8 0
uaddrrnd 24 521 0 503 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 521 0 503 1 0 1 1 0 8 0
vmmpekpl 168 8024 0 7991 2 0 2 2 0 8 0
vmmpepl 168 70893 0 68876 150 25 125 125 0 357 31
vmsppl 368 520 0 503 2 0 2 2 0 8 0
pdppl 4096 1049 0 1008 7 1 6 6 0 8 0
pvpl 32 202307 0 186515 187 7 180 187 0 265 20
pmappl 232 520 0 503 3 1 2 2 0 8 0
extentpl 40 53 0 36 1 0 1 1 0 8 0
phpool 112 276 0 5 8 0 8 8 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffe5c70, count: -1
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
x86_ipi_db(ffff800020d70ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352
x86_ipi_handler() at x86_ipi_handler+0xc6 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
x86_bus_space_io_read_1(3f8,5) at x86_bus_space_io_read_1+0x3c sys/arch/amd64/amd64/bus_space.c:639
comcnputc(800,64) at comcnputc+0x1c8 sys/dev/ic/com.c:1260
cnputc(64) at cnputc+0x4c sys/dev/cons.c:239
kputchar(64,5,0) at kputchar+0x219 sys/kern/subr_prf.c:343
kprintf() at kprintf+0x15c sys/kern/subr_prf.c:700
panic(ffffffff82401f7f) at panic+0xf3 vprintf sys/kern/subr_prf.c:528 [inline]
panic(ffffffff82401f7f) at panic+0xf3 sys/kern/subr_prf.c:197
pool_cache_get(ffffffff828ceae8) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline]
pool_cache_get(ffffffff828ceae8) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884
pool_get(ffffffff828ceae8,2) at pool_get+0x91 sys/kern/subr_pool.c:572
m_gethdr(2,2) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283
tcp_output(ffff800000ada320) at tcp_output+0x14e6
tcp_usrreq(fffffd806eada648,9,fffffd807f01e700,0,0,ffff800020e41d50) at tcp_usrreq+0xa55
end trace frame: 0xffff800020e63c50, count: 0
ddb{1}> trace
x86_ipi_db(ffff800020d70ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352
x86_ipi_handler() at x86_ipi_handler+0xc6 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
x86_bus_space_io_read_1(3f8,5) at x86_bus_space_io_read_1+0x3c sys/arch/amd64/amd64/bus_space.c:639
comcnputc(800,64) at comcnputc+0x1c8 sys/dev/ic/com.c:1260
cnputc(64) at cnputc+0x4c sys/dev/cons.c:239
kputchar(64,5,0) at kputchar+0x219 sys/kern/subr_prf.c:343
kprintf() at kprintf+0x15c sys/kern/subr_prf.c:700
panic(ffffffff82401f7f) at panic+0xf3 vprintf sys/kern/subr_prf.c:528 [inline]
panic(ffffffff82401f7f) at panic+0xf3 sys/kern/subr_prf.c:197
pool_cache_get(ffffffff828ceae8) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline]
pool_cache_get(ffffffff828ceae8) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884
pool_get(ffffffff828ceae8,2) at pool_get+0x91 sys/kern/subr_pool.c:572
m_gethdr(2,2) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283
tcp_output(ffff800000ada320) at tcp_output+0x14e6
tcp_usrreq(fffffd806eada648,9,fffffd807f01e700,0,0,ffff800020e41d50) at tcp_usrreq+0xa55
sosend(fffffd806eada648,0,ffff800020e63d18,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555
dofilewritev(ffff800020e41d50,4,ffff800020e63d18,0,ffff800020e63e00) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365
sys_write(ffff800020e41d50,ffff800020e63db0,ffff800020e63e00) at sys_write+0x83 sys/kern/sys_generic.c:285
syscall(ffff800020e63e80) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800020e63e80) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffc6a20, count: -19