panic: pWoAoRNl_IcaNcGh:e _iSPtLem _NmaOgTic L_OcWheERckE:D mObN ufSYpSlC AcpLLu f1re3e7 l-i1s4t 85m9o2di fEieXdI:T i0te 9m
adStopped at savectx+0xb1: movl $0,%gs:0x530
TID PID UID PRFLAGS PFLAGS CPU COMMAND
* 52840 43897 0 0x2 0 0 syz-executor.1
286576 74703 0 0x12 0 1 sshd
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffdbb80, 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 0xfffffd806d921b00+24 0xe4a9e2acd400496!=0xe4a9eaaa03d1996
ddb{0}> trace
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffdbb80, count: -1
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff8000231951f0
rbx 0
rdx 0xffff800020e6d118
rcx 0
rax 0x39
r8 0xffffffff81b1c4cf kprintf+0x16f
r9 0x1
r10 0x25
r11 0xe6894aed5e94dae0
r12 0
r13 0
r14 0xffff800020e6d118
r15 0
rip 0xffffffff810d13f1 savectx+0xb1
cs 0x8
rflags 0x46
rsp 0xffff800023195170
ss 0
savectx+0xb1: movl $0,%gs:0x530
ddb{0}> show proc
PROC (syz-executor.1) pid=52840 stat=onproc
flags process=2<EXEC,8ORPHAN> proc=0
pri=17, usrpri=71, nice=20
forw=0xffffffffffffffff, list=0xffff800020e6c758,0xffff800020ec6298
process=0xffff800020e81720 user=0xffff800023190000, vmspace=0xfffffd807f000a10
estcpu=36, cpticks=1, pctcpu=0.4
user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
10244 469891 55363 0 2 0 syz-executor.0
10244 104419 55363 0 2 0x4000000 syz-executor.0
99265 267870 0 0 3 0x14200 bored sosplice
*43897 52840 27614 0 7 0x2 syz-executor.1
55363 255732 27614 0 3 0x82 nanosleep syz-executor.0
27614 120518 17640 0 3 0x82 thrsleep syz-fuzzer
27614 306037 17640 0 3 0x4000082 nanosleep syz-fuzzer
27614 97742 17640 0 3 0x4000082 kqread syz-fuzzer
27614 141610 17640 0 3 0x4000082 thrsleep syz-fuzzer
27614 494997 17640 0 3 0x4000082 thrsleep syz-fuzzer
27614 66190 17640 0 3 0x4000082 thrsleep syz-fuzzer
27614 7267 17640 0 3 0x4000082 thrsleep syz-fuzzer
27614 173679 17640 0 3 0x4000082 thrsleep syz-fuzzer
27614 373701 17640 0 3 0x4000082 thrsleep syz-fuzzer
27614 155817 17640 0 3 0x4000082 thrsleep syz-fuzzer
17640 355791 74703 0 3 0x10008a pause ksh
74703 286576 86359 0 7 0x12 sshd
20183 242170 1 0 3 0x100083 ttyin getty
86359 438804 1 0 3 0x80 select sshd
21946 10758 57549 74 3 0x100092 bpf pflogd
57549 229438 1 0 3 0x80 netio pflogd
33834 37080 40207 73 3 0x100090 kqread syslogd
40207 208817 1 0 3 0x100082 netio syslogd
36999 152132 1 77 3 0x100090 poll dhclient
44091 407479 1 0 3 0x80 poll dhclient
41499 162162 0 0 3 0x14200 bored smr
96177 373517 0 0 2 0x14200 zerothread
88833 166268 0 0 3 0x14200 aiodoned aiodoned
99861 464685 0 0 3 0x14200 syncer update
47970 392342 0 0 3 0x14200 cleaner cleaner
93027 354843 0 0 3 0x14200 reaper reaper
50060 288833 0 0 3 0x14200 pgdaemon pagedaemon
66262 261594 0 0 3 0x14200 bored crynlk
19052 316328 0 0 3 0x14200 bored crypto
60482 185706 0 0 3 0x40014200 acpi0 acpi0
12022 300236 0 0 3 0x40014200 idle1
26549 260503 0 0 3 0x14200 bored softnet
27620 444787 0 0 3 0x14200 bored systqmp
31647 161721 0 0 3 0x14200 bored systq
63554 267371 0 0 3 0x40014200 bored softclock
67660 33885 0 0 3 0x40014200 idle0
1 52272 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &diskp->dk_mtx r = 0 (0xffff80000017ac98)
#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 disk_busy+0x21 sys/kern/subr_disk.c:1235
#4 sdstart+0x3dc sys/scsi/sd.c:713
#5 scsi_iopool_run+0x129 scsi_ioh_pending sys/scsi/scsi_base.c:404 [inline]
#5 scsi_iopool_run+0x129 sys/scsi/scsi_base.c:420
#6 scsi_xsh_runqueue+0x210 sys/scsi/scsi_base.c:596
#7 scsi_xsh_add+0xc9 sys/scsi/scsi_base.c:535
#8 sdstrategy+0x187 sys/scsi/sd.c:585
#9 spec_strategy+0x74 sys/kern/spec_vnops.c:468
#10 VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:712
#11 bwrite+0x1b9 sys/kern/vfs_bio.c:756
#12 ffs_update+0x2c2 sys/ufs/ffs/ffs_inode.c:113
#13 ffs_truncate+0xc76
#14 ufs_rmdir+0x3af sys/ufs/ufs/ufs_vnops.c:1355
#15 VOP_RMDIR+0xf8 sys/kern/vfs_vops.c:474
#16 dounlinkat+0x14c sys/kern/vfs_syscalls.c:1886
#17 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#17 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#18 Xsyscall+0x128
Process 43897 (syz-executor.1) thread 0xffff800020e6d118 (52840)
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 ufs_dirremove+0x291
#9 ufs_rmdir+0x247 sys/ufs/ufs/ufs_vnops.c:1328
#10 VOP_RMDIR+0xf8 sys/kern/vfs_vops.c:474
#11 dounlinkat+0x14c sys/kern/vfs_syscalls.c:1886
#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 (0xfffffd806dad8a38)
#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 (0xfffffd806b357098)
#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
exclusive mutex &diskp->dk_mtx r = 0 (0xffff80000017ac98)
#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 disk_busy+0x21 sys/kern/subr_disk.c:1235
#4 sdstart+0x3dc sys/scsi/sd.c:713
#5 scsi_iopool_run+0x129 scsi_ioh_pending sys/scsi/scsi_base.c:404 [inline]
#5 scsi_iopool_run+0x129 sys/scsi/scsi_base.c:420
#6 scsi_xsh_runqueue+0x210 sys/scsi/scsi_base.c:596
#7 scsi_xsh_add+0xc9 sys/scsi/scsi_base.c:535
#8 sdstrategy+0x187 sys/scsi/sd.c:585
#9 spec_strategy+0x74 sys/kern/spec_vnops.c:468
#10 VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:712
#11 bwrite+0x1b9 sys/kern/vfs_bio.c:756
#12 ffs_update+0x2c2 sys/ufs/ffs/ffs_inode.c:113
#13 ffs_truncate+0xc76
#14 ufs_rmdir+0x3af sys/ufs/ufs/ufs_vnops.c:1355
#15 VOP_RMDIR+0xf8 sys/kern/vfs_vops.c:474
#16 dounlinkat+0x14c sys/kern/vfs_syscalls.c:1886
#17 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#17 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#18 Xsyscall+0x128
Process 74703 (sshd) thread 0xffff800020ed1d50 (286576)
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 9529 6607K 6677K 78643K 10705 0
pcb 13 8K 8K 78643K 40 0
rtable 109 3K 3K 78643K 234 0
ifaddr 75 15K 15K 78643K 78 0
counters 43 33K 33K 78643K 43 0
ioctlops 0 0K 4K 78643K 1473 0
iov 0 0K 16K 78643K 26 0
mount 1 1K 1K 78643K 1 0
vnodes 1217 77K 77K 78643K 1262 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 1K 78643K 2 0
VM map 2 1K 1K 78643K 2 0
sem 12 0K 0K 78643K 25 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1809 196K 290K 78643K 12766 0
file desc 5 13K 25K 78643K 134 0
sigio 0 0K 0K 78643K 2 0
proc 61 63K 95K 78643K 454 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 8 0
in_multi 65 3K 3K 78643K 78 0
ether_multi 1 0K 0K 78643K 6 0
mrt 0 0K 0K 78643K 1 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 221 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 21K 78643K 1351 0
UVM aobj 4 2K 2K 78643K 4 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 26 0
NDP 11 0K 0K 78643K 15 0
temp 90 3036K 3104K 78643K 5095 0
kqueue 3 4K 16K 78643K 11 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 8 0 1 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 80 31 0 29 1 0 1 1 0 8 0
rtentry 112 50 0 4 2 0 2 2 0 8 0
unpcb 120 53 0 43 1 0 1 1 0 8 0
syncache 264 8 0 8 2 1 1 1 0 8 1
tcpqe 32 389 0 389 1 1 0 1 0 8 0
tcpcb 544 235 0 231 2 0 2 2 0 8 1
inpcb 280 329 0 322 2 0 2 2 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 1 2 0 2 2 0 8 0
pfrule 1360 21 0 16 2 1 1 2 0 8 0
art_heap8 4096 2 0 0 2 0 2 2 0 8 0
art_heap4 256 204 0 2 13 0 13 13 0 8 0
art_table 32 206 0 2 2 0 2 2 0 8 0
art_node 16 49 0 7 1 0 1 1 0 8 0
semupl 112 1 0 1 1 0 1 1 0 8 1
semapl 112 21 0 11 1 0 1 1 0 8 0
shmpl 112 2 0 0 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1575 0 170 89 0 89 89 0 8 0
ffsino 272 1575 0 170 94 0 94 94 0 8 0
nchpl 144 1933 0 319 61 0 61 61 0 8 0
uvmvnodes 72 1639 0 0 30 0 30 30 0 8 0
vnodes 208 1639 0 0 87 0 87 87 0 8 0
namei 1024 5081 0 5081 1 0 1 1 0 8 1
percpumem 16 32 0 0 1 0 1 1 0 8 0
vmpool 560 2 0 2 1 0 1 1 0 8 1
scxspl 192 6163 0 6163 8 1 7 7 0 8 7
plimitpl 152 21 0 13 1 0 1 1 0 8 0
sigapl 424 350 0 318 4 0 4 4 0 8 0
futexpl 56 1945 0 1945 1 0 1 1 0 8 1
knotepl 112 92 0 73 2 0 2 2 0 8 1
kqueuepl 144 30 0 28 1 0 1 1 0 8 0
pipelkpl 48 108 0 98 1 0 1 1 0 8 0
pipepl 120 216 0 197 1 0 1 1 0 8 0
fdescpl 496 334 0 318 3 0 3 3 0 8 0
filepl 152 1884 0 1784 5 0 5 5 0 8 1
lockfpl 104 35 0 34 1 0 1 1 0 8 0
lockfspl 48 15 0 14 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 96 163 0 154 1 0 1 1 0 8 0
zombiepl 144 318 0 318 1 0 1 1 0 8 1
processpl 984 350 0 318 5 0 5 5 0 8 0
procpl 624 609 0 567 4 0 4 4 0 8 0
sosppl 128 2 0 2 1 0 1 1 0 8 1
sockpl 400 414 0 395 4 0 4 4 0 8 2
mcl64k 65536 8 0 0 1 0 1 1 0 8 0
mcl16k 16384 1 0 0 1 0 1 1 0 8 0
mcl12k 12288 1 0 0 1 0 1 1 0 8 0
mcl9k 9216 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 3 0 0 1 0 1 1 0 8 0
mcl2k2 2112 1 0 0 1 0 1 1 0 8 0
mcl2k 2048 214 0 0 26 0 26 26 0 8 0
mtagpl 80 10 0 0 1 0 1 1 0 8 0
mbufpl 256 236 0 0 14 0 14 14 0 8 0
bufpl 280 4482 0 191 307 0 307 307 0 8 0
anonpl 16 44809 0 29568 63 1 62 62 0 124 0
amapchunkpl 152 1665 0 1532 8 0 8 8 0 158 1
amappl16 192 1364 0 534 43 0 43 43 0 8 1
amappl15 184 2 0 1 2 1 1 1 0 8 0
amappl14 176 80 0 74 1 0 1 1 0 8 0
amappl13 168 79 0 75 1 0 1 1 0 8 0
amappl12 160 8 0 4 1 0 1 1 0 8 0
amappl11 152 61 0 45 1 0 1 1 0 8 0
amappl10 144 18 0 14 1 0 1 1 0 8 0
amappl9 136 438 0 436 1 0 1 1 0 8 0
amappl8 128 340 0 328 1 0 1 1 0 8 0
amappl7 120 119 0 108 1 0 1 1 0 8 0
amappl6 112 31 0 25 1 0 1 1 0 8 0
amappl5 104 181 0 166 1 0 1 1 0 8 0
amappl4 96 542 0 514 1 0 1 1 0 8 0
amappl3 88 157 0 150 1 0 1 1 0 8 0
amappl2 80 1765 0 1691 3 1 2 3 0 8 0
amappl1 72 17523 0 17083 25 14 11 20 0 8 1
amappl 80 855 0 813 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 3 0 0 1 0 1 1 0 8 0
uaddrrnd 24 336 0 320 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 336 0 320 1 0 1 1 0 8 0
vmmpekpl 168 6633 0 6600 2 0 2 2 0 8 0
vmmpepl 168 47679 0 45717 110 7 103 103 0 357 15
vmsppl 368 335 0 320 2 0 2 2 0 8 0
pdppl 4096 680 0 640 6 0 6 6 0 8 0
pvpl 32 154289 0 135907 153 1 152 152 0 265 3
pmappl 232 335 0 320 2 0 2 2 0 8 1
extentpl 40 46 0 29 1 0 1 1 0 8 0
phpool 112 268 0 3 8 0 8 8 0 8 0