panic:WA RpNoIoNlG_:ca ScPheL_ NitOTe m_LOmWaEgRiEcD_ cOhNe cSkY:S mCAbuLfL pl2 -c1pu8 43f9r5ee68 5l2i sEtX ImTo d0i fa
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syzbot
May 30, 2020, 12:57:13 AM5/30/20
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: d0e5c0ea Add a fix from ncurses 20200523 via Hiltjo Posthu..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=1595d46a100000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=cf47bb7212c30662cb2b
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+cf47bb...@syzkaller.appspotmail.com
panic:WA RpNoIoNlG_:ca ScPheL_ NitOTe m_LOmWaEgRiEcD_ cOhNe cSkY:S mCAbuLfL pl2 -c1pu8 43f9r5ee68 5l2i sEtX ImTo d0i fai
e
d:Stopped at savectx+0xb1: movl $0,%gs:0x530
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*115844 47006 0 0x2 0 0 syz-executor.0
342029 14255 0 0x14000 0x200 1 softnet
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffc1890, 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 0xfffffd806d808400+16 0x0!=0xd4ee3057f6d04cad
ddb{0}> trace
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffc1890, count: -1
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff800020f57120
rbx 0
rdx 0x8b
rcx 0x2
rax 0x3b
r8 0xffffffff818e80df kprintf+0x16f
r9 0x1
r10 0x2
r11 0xae02a5c2c5db4ea2
r12 0
r13 0
r14 0xffff800020ec7d58
r15 0
rip 0xffffffff81a603f1 savectx+0xb1
cs 0x8
rflags 0x46
rsp 0xffff800020f570a0
ss 0x10
savectx+0xb1: movl $0,%gs:0x530
ddb{0}> show proc
PROC (syz-executor.0) pid=115844 stat=onproc
flags process=2<EXEC,8ORPHAN> proc=0
pri=16, usrpri=60, nice=20
forw=0xffffffffffffffff, list=0xffff800020ec6c48,0xffff800020ec6508
process=0xffff800020e803e8 user=0xffff800020f52000, vmspace=0xfffffd807f0008a0
estcpu=36, cpticks=1, pctcpu=0.1
user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
48517 295268 47006 0 2 0 syz-executor.0
40087 370601 51015 0 2 0 syz-executor.1
*47006 115844 60651 0 7 0x2 syz-executor.0
53428 418312 0 0 3 0x14200 bored sosplice
51015 453290 60651 0 3 0x82 nanosleep syz-executor.1
60651 44461 55717 0 3 0x82 thrsleep syz-fuzzer
60651 72712 55717 0 2 0x4000002 syz-fuzzer
60651 186759 55717 0 3 0x4000082 thrsleep syz-fuzzer
60651 93199 55717 0 2 0x4000002 syz-fuzzer
60651 210182 55717 0 3 0x4000082 thrsleep syz-fuzzer
60651 481338 55717 0 3 0x4000082 thrsleep syz-fuzzer
60651 200640 55717 0 2 0x4000002 syz-fuzzer
60651 243711 55717 0 3 0x4000082 thrsleep syz-fuzzer
60651 394884 55717 0 3 0x4000082 thrsleep syz-fuzzer
60651 482480 55717 0 3 0x4000082 thrsleep syz-fuzzer
55717 315529 58654 0 3 0x10008a pause ksh
58654 81308 45461 0 2 0x12 sshd
36598 171863 1 0 3 0x100083 ttyin getty
45461 266332 1 0 3 0x80 select sshd
64432 302821 867 74 3 0x100092 bpf pflogd
867 512881 1 0 3 0x80 netio pflogd
33277 9004 2059 73 3 0x100090 kqread syslogd
2059 444293 1 0 3 0x100082 netio syslogd
39594 187132 1 77 3 0x100090 poll dhclient
13078 524003 1 0 3 0x80 poll dhclient
35595 342043 0 0 3 0x14200 bored smr
27880 480835 0 0 2 0x14200 zerothread
64018 42412 0 0 3 0x14200 aiodoned aiodoned
33201 355625 0 0 3 0x14200 syncer update
77619 380613 0 0 3 0x14200 cleaner cleaner
12581 111379 0 0 3 0x14200 reaper reaper
92466 222225 0 0 3 0x14200 pgdaemon pagedaemon
3116 96963 0 0 3 0x14200 bored crynlk
60458 282001 0 0 3 0x14200 bored crypto
85966 305481 0 0 3 0x40014200 acpi0 acpi0
39261 169623 0 0 3 0x40014200 idle1
14255 342029 0 0 7 0x14200 softnet
77975 198125 0 0 3 0x14200 bored systqmp
41733 331117 0 0 3 0x14200 bored systq
69621 59415 0 0 3 0x40014200 bored softclock
91087 343397 0 0 3 0x40014200 idle0
1 351799 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &map->flags_lock r = 0 (0xffffffff82544700)
#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 vm_map_lock_ln+0x7d sys/uvm/uvm_map.c:5437
#4 uvm_map+0x2d0 sys/uvm/uvm_map.c:1236
#5 uvm_km_kmemalloc_pla+0x11d sys/uvm/uvm_km.c:335
#6 uvm_uarea_alloc+0x51 sys/uvm/uvm_glue.c:274
#7 fork1+0x271 sys/kern/kern_fork.c:365
#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 47006 (syz-executor.0) thread 0xffff800020ec7d58 (115844)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82644b58)
#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 &map->flags_lock r = 0 (0xffffffff82544700)
#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 vm_map_lock_ln+0x7d sys/uvm/uvm_map.c:5437
#4 uvm_map+0x2d0 sys/uvm/uvm_map.c:1236
#5 uvm_km_kmemalloc_pla+0x11d sys/uvm/uvm_km.c:335
#6 uvm_uarea_alloc+0x51 sys/uvm/uvm_glue.c:274
#7 fork1+0x271 sys/kern/kern_fork.c:365
#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 14255 (softnet) thread 0xffff800020e18750 (342029)
exclusive rwlock netlock r = 0 (0xffffffff824b2b58)
#0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164
#1 if_input_process+0x85 sys/net/if.c:941
#2 ifiq_process+0x80 sys/net/ifq.c:646
#3 taskq_thread+0x9c sys/kern/kern_task.c:369
#4 proc_trampoline+0x1c
shared rwlock softnet r = 0 (0xffff80000002b0e0)
#0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164
#1 taskq_thread+0x8f sys/kern/kern_task.c:368
#2 proc_trampoline+0x1c
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 9529 6427K 6681K 78643K 11058 0
pcb 13 8K 8K 78643K 71 0
rtable 79 3K 4K 78643K 342 0
ifaddr 74 14K 14K 78643K 130 0
counters 43 33K 34K 78643K 63 0
ioctlops 0 0K 4K 78643K 1496 0
iov 0 0K 16K 78643K 48 0
mount 1 1K 1K 78643K 1 0
vnodes 1224 77K 77K 78643K 1405 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 5K 78643K 8 0
VM map 2 1K 1K 78643K 2 0
sem 12 1K 1K 78643K 29 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1824 197K 290K 78643K 13058 0
file desc 6 17K 25K 78643K 468 0
sigio 0 0K 0K 78643K 2 0
proc 61 63K 83K 78643K 516 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 31 0
in_multi 29 1K 2K 78643K 71 0
ether_multi 1 0K 0K 78643K 8 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 237 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 116 38K 38K 78643K 2278 0
UVM aobj 16 2K 2K 78643K 18 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 42 0
NDP 13 0K 0K 78643K 29 0
temp 108 3035K 3099K 78643K 6011 0
kqueue 3 4K 12K 78643K 19 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 2 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 80 46 0 44 1 0 1 1 0 8 0
rtentry 112 61 0 33 2 0 2 2 0 8 0
unpcb 120 173 0 163 1 0 1 1 0 8 0
syncache 264 4 0 4 1 1 0 1 0 8 0
tcpqe 32 985 0 985 1 1 0 1 0 8 0
tcpcb 544 100 0 96 1 0 1 1 0 8 0
inpcb 280 1057 0 1050 2 1 1 2 0 8 0
nd6 48 9 0 6 1 0 1 1 0 8 0
pkpcb 40 1 0 1 1 1 0 1 0 8 0
ppxss 1128 2 0 2 2 1 1 1 0 8 1
pffrag 232 3 0 3 1 1 0 1 0 482 0
pffrnode 88 3 0 3 1 1 0 1 0 8 0
pffrent 40 93 0 93 1 1 0 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 34 0 9 1 0 1 1 0 8 0
pfstkey 112 34 0 9 1 0 1 1 0 8 0
pfstate 328 34 0 9 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 256 247 0 137 14 4 10 13 0 8 0
art_table 32 248 0 137 2 0 2 2 0 8 0
art_node 16 59 0 36 1 0 1 1 0 8 0
sysvmsgpl 40 6 0 2 1 0 1 1 0 8 0
semupl 112 2 0 2 1 1 0 1 0 8 0
semapl 112 20 0 10 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
dino2pl 256 2004 0 599 89 0 89 89 0 8 0
ffsino 272 2004 0 599 95 0 95 95 0 8 0
nchpl 144 2804 0 1211 60 0 60 60 0 8 0
uvmvnodes 72 2179 0 0 40 0 40 40 0 8 0
vnodes 208 2179 0 0 115 0 115 115 0 8 0
namei 1024 7470 0 7470 2 1 1 1 0 8 1
percpumem 16 42 0 10 1 0 1 1 0 8 0
vcpupl 1984 2 0 0 1 0 1 1 0 8 0
vmpool 560 4 0 2 1 0 1 1 0 8 0
scxspl 192 8890 0 8890 8 7 1 7 0 8 1
plimitpl 152 48 0 40 1 0 1 1 0 8 0
sigapl 424 681 0 648 4 0 4 4 0 8 0
futexpl 56 5237 0 5237 2 1 1 1 0 8 1
knotepl 112 91 0 72 1 0 1 1 0 8 0
kqueuepl 144 37 0 35 1 0 1 1 0 8 0
pipelkpl 48 119 0 109 1 0 1 1 0 8 0
pipepl 120 238 0 219 1 0 1 1 0 8 0
fdescpl 496 665 0 648 3 0 3 3 0 8 0
filepl 152 3636 0 3536 5 0 5 5 0 8 1
lockfpl 104 84 0 83 1 0 1 1 0 8 0
lockfspl 48 23 0 22 1 0 1 1 0 8 0
sessionpl 112 19 0 8 1 0 1 1 0 8 0
pgrppl 48 19 0 8 1 0 1 1 0 8 0
ucredpl 96 235 0 226 1 0 1 1 0 8 0
zombiepl 144 648 0 648 1 0 1 1 0 8 1
processpl 984 681 0 648 5 0 5 5 0 8 0
procpl 624 1467 0 1425 4 0 4 4 0 8 0
srpgc 64 2 0 2 1 1 0 1 0 8 0
sosppl 128 4 0 4 1 1 0 1 0 8 0
sockpl 400 1281 0 1262 4 1 3 4 0 8 1
mcl64k 65536 14 0 0 2 0 2 2 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 6 0 0 1 0 1 1 0 8 0
mcl4k 4096 5 0 0 1 0 1 1 0 8 0
mcl2k2 2112 1 0 0 1 0 1 1 0 8 0
mcl2k 2048 202 0 0 25 0 25 25 0 8 0
mtagpl 80 21 0 0 1 0 1 1 0 8 0
mbufpl 256 468 0 0 29 0 29 29 0 8 0
bufpl 280 4852 0 141 337 0 337 337 0 8 0
anonpl 16 80644 0 66144 70 9 61 69 0 124 0
amapchunkpl 152 3051 0 2922 9 3 6 8 0 158 0
amappl16 192 3372 0 2563 53 11 42 53 0 8 0
amappl15 184 2 0 1 2 1 1 1 0 8 0
amappl14 176 23 0 18 1 0 1 1 0 8 0
amappl13 168 44 0 40 1 0 1 1 0 8 0
amappl12 160 374 0 371 1 0 1 1 0 8 0
amappl11 152 78 0 62 1 0 1 1 0 8 0
amappl10 144 71 0 65 1 0 1 1 0 8 0
amappl9 136 391 0 389 1 0 1 1 0 8 0
amappl8 128 357 0 328 2 0 2 2 0 8 0
amappl7 120 174 0 162 1 0 1 1 0 8 0
amappl6 112 25 0 20 1 0 1 1 0 8 0
amappl5 104 784 0 769 1 0 1 1 0 8 0
amappl4 96 503 0 474 1 0 1 1 0 8 0
amappl3 88 120 0 114 1 0 1 1 0 8 0
amappl2 80 3740 0 3675 2 0 2 2 0 8 0
amappl1 72 22728 0 22300 23 13 10 18 0 8 0
amappl 80 1732 0 1689 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 24 669 0 650 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 669 0 650 1 0 1 1 0 8 0
vmmpekpl 168 8236 0 8196 2 0 2 2 0 8 0
vmmpepl 168 87006 0 85003 127 20 107 117 0 357 16
vmsppl 368 668 0 650 2 0 2 2 0 8 0
pdppl 4096 1346 0 1302 6 0 6 6 0 8 0
pvpl 32 261772 0 244193 171 8 163 171 0 265 16
pmappl 232 668 0 650 3 1 2 2 0 8 0
extentpl 40 53 0 36 1 0 1 1 0 8 0
phpool 112 283 0 9 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: 0x7f7ffffc1890, count: -1
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
x86_ipi_db(ffff800020e00ff0) 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_write_1(3f8,0,3a) at x86_bus_space_io_write_1+0x45 sys/arch/amd64/amd64/bus_space.c:759
comcnputc(800,3a) at comcnputc+0x131 bus_space_barrier machine/bus.h:481 [inline]
comcnputc(800,3a) at comcnputc+0x131 sys/dev/ic/com.c:1254
cnputc(3a) at cnputc+0x4c sys/dev/cons.c:239
kputchar(3a,5,0) at kputchar+0x219 sys/kern/subr_prf.c:343
kprintf() at kprintf+0x15c sys/kern/subr_prf.c:700
panic(ffffffff821fac58) at panic+0xf3 vprintf sys/kern/subr_prf.c:528 [inline]
panic(ffffffff821fac58) at panic+0xf3 sys/kern/subr_prf.c:197
pool_cache_get(ffffffff826919c8) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline]
pool_cache_get(ffffffff826919c8) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884
pool_get(ffffffff826919c8,2) 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(ffff800000a0aee0) at tcp_output+0x14e6
tcp_input(ffff800020e398e8,ffff800020e398f4,6,2) at tcp_input+0x2356
end trace frame: 0xffff800020e397a0, count: 0
ddb{1}> trace
x86_ipi_db(ffff800020e00ff0) 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_write_1(3f8,0,3a) at x86_bus_space_io_write_1+0x45 sys/arch/amd64/amd64/bus_space.c:759
comcnputc(800,3a) at comcnputc+0x131 bus_space_barrier machine/bus.h:481 [inline]
comcnputc(800,3a) at comcnputc+0x131 sys/dev/ic/com.c:1254
cnputc(3a) at cnputc+0x4c sys/dev/cons.c:239
kputchar(3a,5,0) at kputchar+0x219 sys/kern/subr_prf.c:343
kprintf() at kprintf+0x15c sys/kern/subr_prf.c:700
panic(ffffffff821fac58) at panic+0xf3 vprintf sys/kern/subr_prf.c:528 [inline]
panic(ffffffff821fac58) at panic+0xf3 sys/kern/subr_prf.c:197
pool_cache_get(ffffffff826919c8) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline]
pool_cache_get(ffffffff826919c8) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884
pool_get(ffffffff826919c8,2) 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(ffff800000a0aee0) at tcp_output+0x14e6
tcp_input(ffff800020e398e8,ffff800020e398f4,6,2) at tcp_input+0x2356
ip_deliver(ffff800020e398e8,ffff800020e398f4,6,2) at ip_deliver+0x353 sys/netinet/ip_input.c:668
ip_ours(ffff800020e398e8,ffff800020e398f4,ffff800020e18750,0) at ip_ours+0x412
ip_input_if(ffff800020e398e8,ffff800020e398f4,4,0,ffff80000017b2a8) at ip_input_if+0x6ce
ipv4_input(ffff80000017b2a8,fffffd8064c1f400) at ipv4_input+0x48 sys/netinet/ip_input.c:215
ether_input(ffff80000017b2a8,fffffd8064c1f400,0) at ether_input+0x345 sys/net/if_ethersubr.c:461
if_input_process(ffff80000017b2a8,ffff800020e39a18) at if_input_process+0x10b if_ih_input sys/net/if.c:908 [inline]
if_input_process(ffff80000017b2a8,ffff800020e39a18) at if_input_process+0x10b sys/net/if.c:942
ifiq_process(ffff80000017b6a0) at ifiq_process+0x80 sys/net/ifq.c:646
taskq_thread(ffff80000002b080) at taskq_thread+0x9c sys/kern/kern_task.c:369
end trace frame: 0x0, count: -22
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following crash on:
HEAD commit: d0e5c0ea Add a fix from ncurses 20200523 via Hiltjo Posthu..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=1595d46a100000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=cf47bb7212c30662cb2b
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+cf47bb...@syzkaller.appspotmail.com
panic:WA RpNoIoNlG_:ca ScPheL_ NitOTe m_LOmWaEgRiEcD_ cOhNe cSkY:S mCAbuLfL pl2 -c1pu8 43f9r5ee68 5l2i sEtX ImTo d0i fai
e
d:Stopped at savectx+0xb1: movl $0,%gs:0x530
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*115844 47006 0 0x2 0 0 syz-executor.0
342029 14255 0 0x14000 0x200 1 softnet
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffc1890, 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 0xfffffd806d808400+16 0x0!=0xd4ee3057f6d04cad
ddb{0}> trace
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffc1890, count: -1
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff800020f57120
rbx 0
rdx 0x8b
rcx 0x2
rax 0x3b
r8 0xffffffff818e80df kprintf+0x16f
r9 0x1
r10 0x2
r11 0xae02a5c2c5db4ea2
r12 0
r13 0
r14 0xffff800020ec7d58
r15 0
rip 0xffffffff81a603f1 savectx+0xb1
cs 0x8
rflags 0x46
rsp 0xffff800020f570a0
ss 0x10
savectx+0xb1: movl $0,%gs:0x530
ddb{0}> show proc
PROC (syz-executor.0) pid=115844 stat=onproc
flags process=2<EXEC,8ORPHAN> proc=0
pri=16, usrpri=60, nice=20
forw=0xffffffffffffffff, list=0xffff800020ec6c48,0xffff800020ec6508
process=0xffff800020e803e8 user=0xffff800020f52000, vmspace=0xfffffd807f0008a0
estcpu=36, cpticks=1, pctcpu=0.1
user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
48517 295268 47006 0 2 0 syz-executor.0
40087 370601 51015 0 2 0 syz-executor.1
*47006 115844 60651 0 7 0x2 syz-executor.0
53428 418312 0 0 3 0x14200 bored sosplice
51015 453290 60651 0 3 0x82 nanosleep syz-executor.1
60651 44461 55717 0 3 0x82 thrsleep syz-fuzzer
60651 72712 55717 0 2 0x4000002 syz-fuzzer
60651 186759 55717 0 3 0x4000082 thrsleep syz-fuzzer
60651 93199 55717 0 2 0x4000002 syz-fuzzer
60651 210182 55717 0 3 0x4000082 thrsleep syz-fuzzer
60651 481338 55717 0 3 0x4000082 thrsleep syz-fuzzer
60651 200640 55717 0 2 0x4000002 syz-fuzzer
60651 243711 55717 0 3 0x4000082 thrsleep syz-fuzzer
60651 394884 55717 0 3 0x4000082 thrsleep syz-fuzzer
60651 482480 55717 0 3 0x4000082 thrsleep syz-fuzzer
55717 315529 58654 0 3 0x10008a pause ksh
58654 81308 45461 0 2 0x12 sshd
36598 171863 1 0 3 0x100083 ttyin getty
45461 266332 1 0 3 0x80 select sshd
64432 302821 867 74 3 0x100092 bpf pflogd
867 512881 1 0 3 0x80 netio pflogd
33277 9004 2059 73 3 0x100090 kqread syslogd
2059 444293 1 0 3 0x100082 netio syslogd
39594 187132 1 77 3 0x100090 poll dhclient
13078 524003 1 0 3 0x80 poll dhclient
35595 342043 0 0 3 0x14200 bored smr
27880 480835 0 0 2 0x14200 zerothread
64018 42412 0 0 3 0x14200 aiodoned aiodoned
33201 355625 0 0 3 0x14200 syncer update
77619 380613 0 0 3 0x14200 cleaner cleaner
12581 111379 0 0 3 0x14200 reaper reaper
92466 222225 0 0 3 0x14200 pgdaemon pagedaemon
3116 96963 0 0 3 0x14200 bored crynlk
60458 282001 0 0 3 0x14200 bored crypto
85966 305481 0 0 3 0x40014200 acpi0 acpi0
39261 169623 0 0 3 0x40014200 idle1
14255 342029 0 0 7 0x14200 softnet
77975 198125 0 0 3 0x14200 bored systqmp
41733 331117 0 0 3 0x14200 bored systq
69621 59415 0 0 3 0x40014200 bored softclock
91087 343397 0 0 3 0x40014200 idle0
1 351799 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &map->flags_lock r = 0 (0xffffffff82544700)
#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 vm_map_lock_ln+0x7d sys/uvm/uvm_map.c:5437
#4 uvm_map+0x2d0 sys/uvm/uvm_map.c:1236
#5 uvm_km_kmemalloc_pla+0x11d sys/uvm/uvm_km.c:335
#6 uvm_uarea_alloc+0x51 sys/uvm/uvm_glue.c:274
#7 fork1+0x271 sys/kern/kern_fork.c:365
#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 47006 (syz-executor.0) thread 0xffff800020ec7d58 (115844)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82644b58)
#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 &map->flags_lock r = 0 (0xffffffff82544700)
#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 vm_map_lock_ln+0x7d sys/uvm/uvm_map.c:5437
#4 uvm_map+0x2d0 sys/uvm/uvm_map.c:1236
#5 uvm_km_kmemalloc_pla+0x11d sys/uvm/uvm_km.c:335
#6 uvm_uarea_alloc+0x51 sys/uvm/uvm_glue.c:274
#7 fork1+0x271 sys/kern/kern_fork.c:365
#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 14255 (softnet) thread 0xffff800020e18750 (342029)
exclusive rwlock netlock r = 0 (0xffffffff824b2b58)
#0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164
#1 if_input_process+0x85 sys/net/if.c:941
#2 ifiq_process+0x80 sys/net/ifq.c:646
#3 taskq_thread+0x9c sys/kern/kern_task.c:369
#4 proc_trampoline+0x1c
shared rwlock softnet r = 0 (0xffff80000002b0e0)
#0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164
#1 taskq_thread+0x8f sys/kern/kern_task.c:368
#2 proc_trampoline+0x1c
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 9529 6427K 6681K 78643K 11058 0
pcb 13 8K 8K 78643K 71 0
rtable 79 3K 4K 78643K 342 0
ifaddr 74 14K 14K 78643K 130 0
counters 43 33K 34K 78643K 63 0
ioctlops 0 0K 4K 78643K 1496 0
iov 0 0K 16K 78643K 48 0
mount 1 1K 1K 78643K 1 0
vnodes 1224 77K 77K 78643K 1405 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 5K 78643K 8 0
VM map 2 1K 1K 78643K 2 0
sem 12 1K 1K 78643K 29 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1824 197K 290K 78643K 13058 0
file desc 6 17K 25K 78643K 468 0
sigio 0 0K 0K 78643K 2 0
proc 61 63K 83K 78643K 516 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 31 0
in_multi 29 1K 2K 78643K 71 0
ether_multi 1 0K 0K 78643K 8 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 237 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 116 38K 38K 78643K 2278 0
UVM aobj 16 2K 2K 78643K 18 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 42 0
NDP 13 0K 0K 78643K 29 0
temp 108 3035K 3099K 78643K 6011 0
kqueue 3 4K 12K 78643K 19 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 2 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 80 46 0 44 1 0 1 1 0 8 0
rtentry 112 61 0 33 2 0 2 2 0 8 0
unpcb 120 173 0 163 1 0 1 1 0 8 0
syncache 264 4 0 4 1 1 0 1 0 8 0
tcpqe 32 985 0 985 1 1 0 1 0 8 0
tcpcb 544 100 0 96 1 0 1 1 0 8 0
inpcb 280 1057 0 1050 2 1 1 2 0 8 0
nd6 48 9 0 6 1 0 1 1 0 8 0
pkpcb 40 1 0 1 1 1 0 1 0 8 0
ppxss 1128 2 0 2 2 1 1 1 0 8 1
pffrag 232 3 0 3 1 1 0 1 0 482 0
pffrnode 88 3 0 3 1 1 0 1 0 8 0
pffrent 40 93 0 93 1 1 0 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 34 0 9 1 0 1 1 0 8 0
pfstkey 112 34 0 9 1 0 1 1 0 8 0
pfstate 328 34 0 9 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 256 247 0 137 14 4 10 13 0 8 0
art_table 32 248 0 137 2 0 2 2 0 8 0
art_node 16 59 0 36 1 0 1 1 0 8 0
sysvmsgpl 40 6 0 2 1 0 1 1 0 8 0
semupl 112 2 0 2 1 1 0 1 0 8 0
semapl 112 20 0 10 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
dino2pl 256 2004 0 599 89 0 89 89 0 8 0
ffsino 272 2004 0 599 95 0 95 95 0 8 0
nchpl 144 2804 0 1211 60 0 60 60 0 8 0
uvmvnodes 72 2179 0 0 40 0 40 40 0 8 0
vnodes 208 2179 0 0 115 0 115 115 0 8 0
namei 1024 7470 0 7470 2 1 1 1 0 8 1
percpumem 16 42 0 10 1 0 1 1 0 8 0
vcpupl 1984 2 0 0 1 0 1 1 0 8 0
vmpool 560 4 0 2 1 0 1 1 0 8 0
scxspl 192 8890 0 8890 8 7 1 7 0 8 1
plimitpl 152 48 0 40 1 0 1 1 0 8 0
sigapl 424 681 0 648 4 0 4 4 0 8 0
futexpl 56 5237 0 5237 2 1 1 1 0 8 1
knotepl 112 91 0 72 1 0 1 1 0 8 0
kqueuepl 144 37 0 35 1 0 1 1 0 8 0
pipelkpl 48 119 0 109 1 0 1 1 0 8 0
pipepl 120 238 0 219 1 0 1 1 0 8 0
fdescpl 496 665 0 648 3 0 3 3 0 8 0
filepl 152 3636 0 3536 5 0 5 5 0 8 1
lockfpl 104 84 0 83 1 0 1 1 0 8 0
lockfspl 48 23 0 22 1 0 1 1 0 8 0
sessionpl 112 19 0 8 1 0 1 1 0 8 0
pgrppl 48 19 0 8 1 0 1 1 0 8 0
ucredpl 96 235 0 226 1 0 1 1 0 8 0
zombiepl 144 648 0 648 1 0 1 1 0 8 1
processpl 984 681 0 648 5 0 5 5 0 8 0
procpl 624 1467 0 1425 4 0 4 4 0 8 0
srpgc 64 2 0 2 1 1 0 1 0 8 0
sosppl 128 4 0 4 1 1 0 1 0 8 0
sockpl 400 1281 0 1262 4 1 3 4 0 8 1
mcl64k 65536 14 0 0 2 0 2 2 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 6 0 0 1 0 1 1 0 8 0
mcl4k 4096 5 0 0 1 0 1 1 0 8 0
mcl2k2 2112 1 0 0 1 0 1 1 0 8 0
mcl2k 2048 202 0 0 25 0 25 25 0 8 0
mtagpl 80 21 0 0 1 0 1 1 0 8 0
mbufpl 256 468 0 0 29 0 29 29 0 8 0
bufpl 280 4852 0 141 337 0 337 337 0 8 0
anonpl 16 80644 0 66144 70 9 61 69 0 124 0
amapchunkpl 152 3051 0 2922 9 3 6 8 0 158 0
amappl16 192 3372 0 2563 53 11 42 53 0 8 0
amappl15 184 2 0 1 2 1 1 1 0 8 0
amappl14 176 23 0 18 1 0 1 1 0 8 0
amappl13 168 44 0 40 1 0 1 1 0 8 0
amappl12 160 374 0 371 1 0 1 1 0 8 0
amappl11 152 78 0 62 1 0 1 1 0 8 0
amappl10 144 71 0 65 1 0 1 1 0 8 0
amappl9 136 391 0 389 1 0 1 1 0 8 0
amappl8 128 357 0 328 2 0 2 2 0 8 0
amappl7 120 174 0 162 1 0 1 1 0 8 0
amappl6 112 25 0 20 1 0 1 1 0 8 0
amappl5 104 784 0 769 1 0 1 1 0 8 0
amappl4 96 503 0 474 1 0 1 1 0 8 0
amappl3 88 120 0 114 1 0 1 1 0 8 0
amappl2 80 3740 0 3675 2 0 2 2 0 8 0
amappl1 72 22728 0 22300 23 13 10 18 0 8 0
amappl 80 1732 0 1689 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 24 669 0 650 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 669 0 650 1 0 1 1 0 8 0
vmmpekpl 168 8236 0 8196 2 0 2 2 0 8 0
vmmpepl 168 87006 0 85003 127 20 107 117 0 357 16
vmsppl 368 668 0 650 2 0 2 2 0 8 0
pdppl 4096 1346 0 1302 6 0 6 6 0 8 0
pvpl 32 261772 0 244193 171 8 163 171 0 265 16
pmappl 232 668 0 650 3 1 2 2 0 8 0
extentpl 40 53 0 36 1 0 1 1 0 8 0
phpool 112 283 0 9 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: 0x7f7ffffc1890, count: -1
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
x86_ipi_db(ffff800020e00ff0) 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_write_1(3f8,0,3a) at x86_bus_space_io_write_1+0x45 sys/arch/amd64/amd64/bus_space.c:759
comcnputc(800,3a) at comcnputc+0x131 bus_space_barrier machine/bus.h:481 [inline]
comcnputc(800,3a) at comcnputc+0x131 sys/dev/ic/com.c:1254
cnputc(3a) at cnputc+0x4c sys/dev/cons.c:239
kputchar(3a,5,0) at kputchar+0x219 sys/kern/subr_prf.c:343
kprintf() at kprintf+0x15c sys/kern/subr_prf.c:700
panic(ffffffff821fac58) at panic+0xf3 vprintf sys/kern/subr_prf.c:528 [inline]
panic(ffffffff821fac58) at panic+0xf3 sys/kern/subr_prf.c:197
pool_cache_get(ffffffff826919c8) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline]
pool_cache_get(ffffffff826919c8) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884
pool_get(ffffffff826919c8,2) 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(ffff800000a0aee0) at tcp_output+0x14e6
tcp_input(ffff800020e398e8,ffff800020e398f4,6,2) at tcp_input+0x2356
end trace frame: 0xffff800020e397a0, count: 0
ddb{1}> trace
x86_ipi_db(ffff800020e00ff0) 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_write_1(3f8,0,3a) at x86_bus_space_io_write_1+0x45 sys/arch/amd64/amd64/bus_space.c:759
comcnputc(800,3a) at comcnputc+0x131 bus_space_barrier machine/bus.h:481 [inline]
comcnputc(800,3a) at comcnputc+0x131 sys/dev/ic/com.c:1254
cnputc(3a) at cnputc+0x4c sys/dev/cons.c:239
kputchar(3a,5,0) at kputchar+0x219 sys/kern/subr_prf.c:343
kprintf() at kprintf+0x15c sys/kern/subr_prf.c:700
panic(ffffffff821fac58) at panic+0xf3 vprintf sys/kern/subr_prf.c:528 [inline]
panic(ffffffff821fac58) at panic+0xf3 sys/kern/subr_prf.c:197
pool_cache_get(ffffffff826919c8) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline]
pool_cache_get(ffffffff826919c8) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884
pool_get(ffffffff826919c8,2) 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(ffff800000a0aee0) at tcp_output+0x14e6
tcp_input(ffff800020e398e8,ffff800020e398f4,6,2) at tcp_input+0x2356
ip_deliver(ffff800020e398e8,ffff800020e398f4,6,2) at ip_deliver+0x353 sys/netinet/ip_input.c:668
ip_ours(ffff800020e398e8,ffff800020e398f4,ffff800020e18750,0) at ip_ours+0x412
ip_input_if(ffff800020e398e8,ffff800020e398f4,4,0,ffff80000017b2a8) at ip_input_if+0x6ce
ipv4_input(ffff80000017b2a8,fffffd8064c1f400) at ipv4_input+0x48 sys/netinet/ip_input.c:215
ether_input(ffff80000017b2a8,fffffd8064c1f400,0) at ether_input+0x345 sys/net/if_ethersubr.c:461
if_input_process(ffff80000017b2a8,ffff800020e39a18) at if_input_process+0x10b if_ih_input sys/net/if.c:908 [inline]
if_input_process(ffff80000017b2a8,ffff800020e39a18) at if_input_process+0x10b sys/net/if.c:942
ifiq_process(ffff80000017b6a0) at ifiq_process+0x80 sys/net/ifq.c:646
taskq_thread(ffff80000002b080) at taskq_thread+0x9c sys/kern/kern_task.c:369
end trace frame: 0x0, count: -22
---
This bug is generated by a bot. It may contain errors.
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Anton Lindqvist
May 30, 2020, 3:37:21 AM5/30/20
to syzbot, syzkaller-o...@googlegroups.com
#syz dup: pool: cpu free list modified: mbufpl
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