panic: pool_cache_item_mWaAgRiNcIN_Gc:h ecSPkL: NOmTb uLfOWpEl REcDp OuN f SrYeSe CAliLLs t1 m3o6d i-fi35e7d:6 0i EtXeImT ad0dr 9
0
xStopped at savectx+0xb1: movl $0,%gs:0x530
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*418769 62549 0 0x2 0 0 syz-executor.0
117442 2126 0 0x12 0 1 sshd
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7fffff74c0, 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 0xfffffd807e94e200+16 0x0!=0xa29eb1bbfce413d6
ddb{0}> trace
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7fffff74c0, count: -1
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff800020f6bc20
rbx 0
rdx 0xffff800020e6dd48
rcx 0
rax 0x38
r8 0xffffffff81b1c4cf kprintf+0x16f
r9 0x1
r10 0x25
r11 0x87754b05314e49b1
r12 0
r13 0
r14 0xffff800020e6dd48
r15 0
rip 0xffffffff810d13f1 savectx+0xb1
cs 0x8
rflags 0x46
rsp 0xffff800020f6bba0
ss 0x10
savectx+0xb1: movl $0,%gs:0x530
ddb{0}> show proc
PROC (syz-executor.0) pid=418769 stat=onproc
flags process=2<EXEC,8ORPHAN> proc=0
pri=17, usrpri=83, nice=20
forw=0xffffffffffffffff, list=0xffff800020e6cea8,0xffff800020e93af8
process=0xffff800020e81348 user=0xffff800020f66000, vmspace=0xfffffd807f000170
estcpu=33, cpticks=2, pctcpu=0.7
user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
42023 119236 33199 0 2 0x2 syz-executor.1
*62549 418769 33199 0 7 0x2 syz-executor.0
33199 235573 91866 0 3 0x82 thrsleep syz-fuzzer
33199 42494 91866 0 3 0x4000082 nanosleep syz-fuzzer
33199 381421 91866 0 3 0x4000082 thrsleep syz-fuzzer
33199 237513 91866 0 3 0x4000082 thrsleep syz-fuzzer
33199 191531 91866 0 3 0x4000082 nanosleep syz-fuzzer
33199 222401 91866 0 3 0x4000082 thrsleep syz-fuzzer
33199 383238 91866 0 3 0x4000082 thrsleep syz-fuzzer
33199 354201 91866 0 3 0x4000082 thrsleep syz-fuzzer
33199 303293 91866 0 3 0x4000082 kqread syz-fuzzer
33199 414943 91866 0 3 0x4000082 thrsleep syz-fuzzer
91866 417166 2126 0 3 0x10008a pause ksh
2126 117442 41906 0 7 0x12 sshd
66782 309388 1 0 3 0x100083 ttyin getty
41906 408906 1 0 3 0x80 select sshd
60912 522457 45654 74 3 0x100092 bpf pflogd
45654 142347 1 0 3 0x80 netio pflogd
53945 321592 23510 73 3 0x100090 kqread syslogd
23510 413632 1 0 3 0x100082 netio syslogd
44695 274205 1 77 3 0x100090 poll dhclient
92314 268440 1 0 3 0x80 poll dhclient
55230 175575 0 0 3 0x14200 bored smr
89257 105074 0 0 3 0x14200 pgzero zerothread
49278 247504 0 0 3 0x14200 aiodoned aiodoned
73571 122563 0 0 3 0x14200 syncer update
30325 151324 0 0 3 0x14200 cleaner cleaner
91518 446463 0 0 3 0x14200 reaper reaper
68917 38154 0 0 3 0x14200 pgdaemon pagedaemon
84644 83450 0 0 3 0x14200 bored crynlk
7328 333461 0 0 3 0x14200 bored crypto
16321 417193 0 0 3 0x40014200 acpi0 acpi0
65990 434178 0 0 3 0x40014200 idle1
44942 318573 0 0 2 0x14200 softnet
24500 220322 0 0 3 0x14200 bored systqmp
48726 187130 0 0 3 0x14200 bored systq
81080 7769 0 0 3 0x40014200 bored softclock
6464 315426 0 0 3 0x40014200 idle0
1 404902 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &iopl->mtx r = 0 (0xffff800000038170)
#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 scsi_xsh_runqueue+0x37 scsi_pending_start sys/scsi/scsi_base.c:214 [inline]
#3 scsi_xsh_runqueue+0x37 sys/scsi/scsi_base.c:576
#4 scsi_xsh_add+0xc9 sys/scsi/scsi_base.c:535
#5 sdstrategy+0x187 sys/scsi/sd.c:585
#6 spec_strategy+0x74 sys/kern/spec_vnops.c:468
#7 ufs_strategy+0x17c
#8 VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:712
#9 bwrite+0x1b9 sys/kern/vfs_bio.c:756
#10 VOP_BWRITE+0x4a sys/kern/vfs_vops.c:724
#11 ufs_mkdir+0x6b7 sys/ufs/ufs/ufs_vnops.c:1248
#12 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450
#13 domkdirat+0x121 sys/kern/vfs_syscalls.c:3051
#14 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#14 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#15 Xsyscall+0x128
Process 42023 (syz-executor.1) thread 0xffff800020e93ae8 (119236)
exclusive rrwlock inode r = 0 (0xfffffd806495b920)
#0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164
#1 rw_enter+0x453 sys/kern/kern_rwlock.c:311
#2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462
#3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:603
#4 vn_lock+0x81 sys/kern/vfs_vnops.c:575
#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:1329
#8 ufs_lookup+0x14b7 sys/ufs/ufs/ufs_lookup.c:487
#9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:90
#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:1853
#13 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#13 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#14 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd806b3721a8)
#0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164
#1 rw_enter+0x453 sys/kern/kern_rwlock.c:311
#2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462
#3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:603
#4 vn_lock+0x81 sys/kern/vfs_vnops.c:575
#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:1853
#8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#9 Xsyscall+0x128
Process 62549 (syz-executor.0) thread 0xffff800020e6dd48 (418769)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82677920)
#0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164
#1 __mp_acquire_count+0x51 sys/kern/kern_lock.c:227
#2 mi_switch+0x392 sys/kern/sched_bsd.c:435
#3 sleep_finish+0x113 sys/kern/kern_synch.c:418
#4 sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline]
#4 sleep_finish_all+0x32 sys/kern/kern_synch.c:393
#5 tsleep+0x1cc sys/kern/kern_synch.c:155
#6 biowait+0xa6 sys/kern/vfs_bio.c:1255
#7 bwrite+0x1e4 sys/kern/vfs_bio.c:765
#8 ffs_update+0x2c2 sys/ufs/ffs/ffs_inode.c:113
#9 ufs_mkdir+0x665 sys/ufs/ufs/ufs_vnops.c:1232
#10 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450
#11 domkdirat+0x121 sys/kern/vfs_syscalls.c:3051
#12 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#12 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#13 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd806495b1b0)
#0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164
#1 rw_enter+0x453 sys/kern/kern_rwlock.c:311
#2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462
#3 ufs_ihashins+0x45 sys/ufs/ufs/ufs_ihash.c:140
#4 ffs_vget+0x13e sys/ufs/ffs/ffs_vfsops.c:1358
#5 ffs_inode_alloc+0x1cf sys/ufs/ffs/ffs_alloc.c:392
#6 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1162
#7 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450
#8 domkdirat+0x121 sys/kern/vfs_syscalls.c:3051
#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
exclusive rrwlock inode r = 0 (0xfffffd806b3722b8)
#0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164
#1 rw_enter+0x453 sys/kern/kern_rwlock.c:311
#2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462
#3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:603
#4 vn_lock+0x81 sys/kern/vfs_vnops.c:575
#5 vfs_lookup+0xe6 sys/kern/vfs_lookup.c:419
#6 namei+0x63c sys/kern/vfs_lookup.c:249
#7 domkdirat+0x75 sys/kern/vfs_syscalls.c:3036
#8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#9 Xsyscall+0x128
exclusive mutex &iopl->mtx r = 0 (0xffff800000038170)
#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 scsi_xsh_runqueue+0x37 scsi_pending_start sys/scsi/scsi_base.c:214 [inline]
#3 scsi_xsh_runqueue+0x37 sys/scsi/scsi_base.c:576
#4 scsi_xsh_add+0xc9 sys/scsi/scsi_base.c:535
#5 sdstrategy+0x187 sys/scsi/sd.c:585
#6 spec_strategy+0x74 sys/kern/spec_vnops.c:468
#7 ufs_strategy+0x17c
#8 VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:712
#9 bwrite+0x1b9 sys/kern/vfs_bio.c:756
#10 VOP_BWRITE+0x4a sys/kern/vfs_vops.c:724
#11 ufs_mkdir+0x6b7 sys/ufs/ufs/ufs_vnops.c:1248
#12 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450
#13 domkdirat+0x121 sys/kern/vfs_syscalls.c:3051
#14 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#14 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#15 Xsyscall+0x128
Process 2126 (sshd) thread 0xffff800020ed1390 (117442)
exclusive rwlock netlock r = 0 (0xffffffff825363f8)
#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:537
#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 9532 6671K 7060K 78643K 11053 0
pcb 13 8K 8K 78643K 39 0
rtable 89 2K 3K 78643K 238 0
ifaddr 68 13K 13K 78643K 91 0
counters 43 33K 34K 78643K 49 0
ioctlops 0 0K 4K 78643K 1473 0
iov 0 0K 32K 78643K 11 0
mount 1 1K 1K 78643K 1 0
vnodes 1224 77K 77K 78643K 1344 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 5K 78643K 4 0
VM map 2 1K 1K 78643K 2 0
sem 9 0K 1K 78643K 12 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1809 196K 290K 78643K 12766 0
file desc 4 9K 25K 78643K 110 0
sigio 0 0K 0K 78643K 2 0
proc 59 63K 83K 78643K 447 0
subproc 32 2K 2K 78643K 34 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 4 0
in_multi 37 2K 2K 78643K 47 0
ether_multi 1 0K 0K 78643K 5 0
mrt 0 0K 0K 78643K 3 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 85 387K 387K 78643K 85 0
exec 0 0K 1K 78643K 214 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 97 21K 22K 78643K 1263 0
UVM aobj 6 2K 2K 78643K 6 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 16 0
NDP 11 0K 0K 78643K 18 0
temp 91 3037K 3105K 78643K 2846 0
kqueue 3 4K 18K 78643K 42 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 6 0 0 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 80 23 0 21 1 0 1 1 0 8 0
rtentry 112 48 0 12 2 0 2 2 0 8 0
unpcb 120 61 0 51 1 0 1 1 0 8 0
syncache 264 4 0 4 1 1 0 1 0 8 0
tcpqe 32 638 0 638 1 1 0 1 0 8 0
tcpcb 544 40 0 36 1 0 1 1 0 8 0
inpcb 280 128 0 121 1 0 1 1 0 8 0
rttmr 72 1 0 1 1 0 1 1 0 8 1
nd6 48 6 0 0 1 0 1 1 0 8 0
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 16 0 1 1 0 1 1 0 8 0
pfstkey 112 16 0 1 1 0 1 1 0 8 0
pfstate 328 16 0 0 2 0 2 2 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 256 200 0 47 13 0 13 13 0 8 1
art_table 32 201 0 47 2 0 2 2 0 8 0
art_node 16 47 0 17 1 0 1 1 0 8 0
sysvmsgpl 40 2 0 0 1 0 1 1 0 8 0
semupl 112 1 0 1 1 1 0 1 0 8 0
semapl 112 7 0 0 1 0 1 1 0 8 0
shmpl 112 4 0 0 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1544 0 135 89 0 89 89 0 8 0
ffsino 272 1544 0 135 95 0 95 95 0 8 0
nchpl 144 1869 0 256 61 0 61 61 0 8 0
uvmvnodes 72 1691 0 0 31 0 31 31 0 8 0
vnodes 208 1691 0 0 89 0 89 89 0 8 0
namei 1024 5243 0 5243 1 0 1 1 0 8 1
percpumem 16 35 0 3 1 0 1 1 0 8 0
scxspl 192 5685 0 5685 8 3 5 7 0 8 5
plimitpl 152 21 0 13 1 0 1 1 0 8 0
sigapl 424 325 0 295 4 0 4 4 0 8 0
futexpl 56 1535 0 1535 1 0 1 1 0 8 1
knotepl 112 113 0 94 1 0 1 1 0 8 0
kqueuepl 144 82 0 80 1 0 1 1 0 8 0
pipelkpl 48 80 0 70 1 0 1 1 0 8 0
pipepl 120 160 0 141 1 0 1 1 0 8 0
fdescpl 496 310 0 295 3 0 3 3 0 8 0
filepl 152 1906 0 1806 6 0 6 6 0 8 2
lockfpl 104 18 0 17 1 0 1 1 0 8 0
lockfspl 48 9 0 8 1 0 1 1 0 8 0
sessionpl 112 18 0 7 1 0 1 1 0 8 0
pgrppl 48 18 0 7 1 0 1 1 0 8 0
ucredpl 96 300 0 290 1 0 1 1 0 8 0
zombiepl 144 295 0 295 2 1 1 1 0 8 1
processpl 984 325 0 295 6 1 5 5 0 8 1
procpl 624 514 0 475 4 0 4 4 0 8 0
sockpl 400 212 0 193 4 1 3 3 0 8 1
mcl64k 65536 4 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
mcl4k 4096 4 0 0 1 0 1 1 0 8 0
mcl2k 2048 182 0 0 22 0 22 22 0 8 0
mtagpl 80 10 0 0 1 0 1 1 0 8 0
mbufpl 256 224 0 0 13 0 13 13 0 8 0
bufpl 280 4305 0 190 294 0 294 294 0 8 0
anonpl 16 41641 0 27348 60 1 59 59 0 124 0
amapchunkpl 152 1461 0 1310 8 0 8 8 0 158 0
amappl16 192 1183 0 414 39 0 39 39 0 8 0
amappl15 184 1 0 0 1 0 1 1 0 8 0
amappl14 176 98 0 93 1 0 1 1 0 8 0
amappl13 168 68 0 64 1 0 1 1 0 8 0
amappl12 160 11 0 7 1 0 1 1 0 8 0
amappl11 152 54 0 39 1 0 1 1 0 8 0
amappl10 144 15 0 12 1 0 1 1 0 8 0
amappl9 136 394 0 392 1 0 1 1 0 8 0
amappl8 128 296 0 283 1 0 1 1 0 8 0
amappl7 120 119 0 108 1 0 1 1 0 8 0
amappl6 112 24 0 21 1 0 1 1 0 8 0
amappl5 104 169 0 154 1 0 1 1 0 8 0
amappl4 96 532 0 504 1 0 1 1 0 8 0
amappl3 88 182 0 176 1 0 1 1 0 8 0
amappl2 80 1492 0 1432 3 1 2 3 0 8 0
amappl1 72 16808 0 16381 25 15 10 20 0 8 0
amappl 80 764 0 720 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 5 0 0 1 0 1 1 0 8 0
uaddrrnd 24 310 0 295 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 310 0 295 1 0 1 1 0 8 0
vmmpekpl 168 6371 0 6343 2 0 2 2 0 8 0
vmmpepl 168 44620 0 42833 114 11 103 107 0 357 18
vmsppl 368 309 0 295 2 0 2 2 0 8 0
pdppl 4096 628 0 590 6 0 6 6 0 8 0
pvpl 32 149479 0 132112 150 2 148 148 0 265 4
pmappl 232 309 0 295 2 1 1 2 0 8 0
extentpl 40 46 0 29 1 0 1 1 0 8 0
phpool 112 260 0 4 8 0 8 8 0 8 0