panic: WApRoNoIl_NcGa: cShPeL_i NtOeTm _LmOaWgiERcE_Dc hOeNc kS:Y SmCbAuLfLp l 2 cp19u 1f3r8e8e0 380l iEXsIt T m0od ai
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syzbot
May 10, 2020, 10:37:12 AM5/10/20
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: bb2235eb Use the same inittodr()/resettodr() implementatio..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=11439248100000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=11651723f14cf622cd2f
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+116517...@syzkaller.appspotmail.com
panic: WApRoNoIl_NcGa: cShPeL_i NtOeTm _LmOaWgiERcE_Dc hOeNc kS:Y SmCbAuLfLp l 2 cp19u 1f3r8e8e0 380l iEXsIt T m0od ai
f
ieStopped at savectx+0xb1: movl $0,%gs:0x530
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*251602 76677 0 0x2 0 0 syz-executor.1
304536 15018 0 0x12 0 1 sshd
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffc3e00, 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 0xfffffd807924f600+16 0x0!=0x2cf2db66438af5ad
ddb{0}> trace
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffc3e00, count: -1
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff800021f911a0
rbx 0
rdx 0xffff800020ec6288
rcx 0
rax 0x3a
r8 0xffffffff81276dcf kprintf+0x16f
r9 0x1
r10 0x25
r11 0xa32ecc101584873a
r12 0
r13 0
r14 0xffff800020ec6288
r15 0
rip 0xffffffff81a323f1 savectx+0xb1
cs 0x8
rflags 0x46
rsp 0xffff800021f91120
ss 0x10
savectx+0xb1: movl $0,%gs:0x530
ddb{0}> show proc
PROC (syz-executor.1) pid=251602 stat=onproc
flags process=2<EXEC,8ORPHAN> proc=0
pri=16, usrpri=54, nice=20
forw=0xffffffffffffffff, list=0xffff800020ec6018,0xffff800020ec7618
process=0xffff800020e93730 user=0xffff800021f8c000, vmspace=0xfffffd806e954178
estcpu=4, cpticks=1, pctcpu=0.1
user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
15739 474924 76677 0 2 0 syz-executor.1
78737 524239 84441 0 3 0x80 nanosleep syz-executor.0
78737 210021 84441 0 3 0x4000080 kqread syz-executor.0
78737 8135 84441 0 3 0x4000080 fsleep syz-executor.0
*76677 251602 3169 0 7 0x2 syz-executor.1
51277 224828 0 0 3 0x14200 bored sosplice
84441 485831 3169 0 3 0x82 nanosleep syz-executor.0
3169 222194 81280 0 3 0x82 thrsleep syz-fuzzer
3169 4011 81280 0 3 0x4000082 nanosleep syz-fuzzer
3169 166601 81280 0 3 0x4000082 thrsleep syz-fuzzer
3169 371861 81280 0 2 0x4000002 syz-fuzzer
3169 232269 81280 0 3 0x4000082 thrsleep syz-fuzzer
3169 253859 81280 0 3 0x4000082 thrsleep syz-fuzzer
3169 377772 81280 0 3 0x4000082 thrsleep syz-fuzzer
3169 13526 81280 0 3 0x4000082 thrsleep syz-fuzzer
3169 376428 81280 0 2 0x4000002 syz-fuzzer
3169 143812 81280 0 3 0x4000082 thrsleep syz-fuzzer
81280 144160 15018 0 3 0x10008a pause ksh
15018 304536 64412 0 7 0x12 sshd
45380 275689 1 0 3 0x100083 ttyin getty
64412 57130 1 0 3 0x80 select sshd
6698 429670 85999 74 3 0x100092 bpf pflogd
85999 439587 1 0 3 0x80 netio pflogd
65761 113064 23261 73 3 0x100090 kqread syslogd
23261 387370 1 0 3 0x100082 netio syslogd
9676 298564 1 77 3 0x100090 poll dhclient
24961 355424 1 0 3 0x80 poll dhclient
62803 304467 0 0 3 0x14200 bored smr
99623 62570 0 0 3 0x14200 pgzero zerothread
46809 148793 0 0 3 0x14200 aiodoned aiodoned
20414 321504 0 0 3 0x14200 syncer update
45258 433071 0 0 3 0x14200 cleaner cleaner
24062 254603 0 0 3 0x14200 reaper reaper
87274 388986 0 0 3 0x14200 pgdaemon pagedaemon
69116 215175 0 0 3 0x14200 bored crynlk
23226 287443 0 0 3 0x14200 bored crypto
15495 479087 0 0 3 0x40014200 acpi0 acpi0
21870 249276 0 0 3 0x40014200 idle1
62770 418575 0 0 2 0x14200 softnet
12757 200048 0 0 3 0x14200 bored systqmp
54989 187234 0 0 3 0x14200 bored systq
81536 415508 0 0 3 0x40014200 bored softclock
18291 64066 0 0 3 0x40014200 idle0
1 325558 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 (0xffffffff82673590)
#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_put+0x64 sys/kern/subr_pool.c:792
#4 uvm_unmap_detach+0x231 sys/uvm/uvm_map.c:1581
#5 uvm_map+0xe0c sys/uvm/uvm_map.c:1420
#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 76677 (syz-executor.1) thread 0xffff800020ec6288 (251602)
exclusive kernel_lock &kernel_lock r = 1 (0xffffffff8268a7c8)
#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 (0xffffffff82673590)
#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_put+0x64 sys/kern/subr_pool.c:792
#4 uvm_unmap_detach+0x231 sys/uvm/uvm_map.c:1581
#5 uvm_map+0xe0c sys/uvm/uvm_map.c:1420
#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 15018 (sshd) thread 0xffff800020ede4f0 (304536)
exclusive rwlock netlock r = 0 (0xffffffff824ddc08)
#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 9527 6427K 7069K 78643K 11364 0
pcb 13 8K 8K 78643K 110 0
rtable 75 2K 3K 78643K 336 0
ifaddr 79 15K 16K 78643K 149 0
counters 43 33K 34K 78643K 63 0
ioctlops 0 0K 4K 78643K 1495 0
iov 0 0K 32K 78643K 77 0
mount 1 1K 1K 78643K 1 0
vnodes 1223 77K 77K 78643K 1611 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 5K 78643K 10 0
VM map 2 1K 1K 78643K 2 0
sem 12 0K 1K 78643K 89 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1823 197K 290K 78643K 12980 0
file desc 6 17K 25K 78643K 471 0
sigio 0 0K 0K 78643K 5 0
proc 61 63K 95K 78643K 528 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 51 0
in_multi 60 3K 3K 78643K 135 0
ether_multi 1 0K 0K 78643K 23 0
mrt 0 0K 0K 78643K 6 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 258 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 131 72K 72K 78643K 2657 0
UVM aobj 19 2K 2K 78643K 28 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 89 0
NDP 13 0K 0K 78643K 29 0
temp 113 3040K 3113K 78643K 13201 0
kqueue 4 6K 16K 78643K 62 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 4 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 80 41 0 39 1 0 1 1 0 8 0
rtentry 112 62 0 33 2 0 2 2 0 8 0
unpcb 120 261 0 251 1 0 1 1 0 8 0
syncache 264 5 0 5 2 2 0 1 0 8 0
tcpqe 32 1 0 1 1 1 0 1 0 8 0
tcpcb 544 229 0 224 1 0 1 1 0 8 0
inpcb 280 772 0 764 4 2 2 2 0 8 1
rttmr 72 1 0 1 1 1 0 1 0 8 0
nd6 48 10 0 6 1 0 1 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 10 0 9 2 1 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 56 0 34 1 0 1 1 0 8 0
pfstkey 112 56 0 34 1 0 1 1 0 8 0
pfstate 328 56 0 34 3 0 3 3 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 256 274 0 138 12 3 9 12 0 8 0
art_table 32 276 0 138 2 0 2 2 0 8 0
art_node 16 61 0 37 1 0 1 1 0 8 0
sysvmsgpl 40 22 0 17 1 0 1 1 0 8 0
semupl 112 1 0 1 1 1 0 1 0 8 0
semapl 112 83 0 73 1 0 1 1 0 8 0
shmpl 112 26 0 9 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 2260 0 855 89 0 89 89 0 8 0
ffsino 272 2260 0 855 95 0 95 95 0 8 0
nchpl 144 3083 0 1490 60 0 60 60 0 8 0
uvmvnodes 72 2508 0 0 46 0 46 46 0 8 0
vnodes 208 2508 0 0 132 0 132 132 0 8 0
namei 1024 9294 0 9294 3 2 1 1 0 8 1
percpumem 16 42 0 10 1 0 1 1 0 8 0
vcpupl 1984 6 0 0 1 0 1 1 0 8 0
vmpool 560 8 0 2 1 0 1 1 0 8 0
scxspl 192 8648 0 8648 8 7 1 5 0 8 1
plimitpl 152 50 0 42 1 0 1 1 0 8 0
sigapl 424 684 0 651 4 0 4 4 0 8 0
futexpl 56 7333 0 7332 3 2 1 1 0 8 0
knotepl 112 152 0 133 1 0 1 1 0 8 0
kqueuepl 144 161 0 157 1 0 1 1 0 8 0
pipelkpl 48 183 0 173 1 0 1 1 0 8 0
pipepl 120 366 0 347 2 1 1 2 0 8 0
fdescpl 496 668 0 651 3 0 3 3 0 8 0
filepl 152 4714 0 4608 7 2 5 7 0 8 0
lockfpl 104 251 0 250 1 0 1 1 0 8 0
lockfspl 48 73 0 72 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 96 686 0 677 1 0 1 1 0 8 0
zombiepl 144 651 0 651 1 0 1 1 0 8 1
processpl 984 684 0 651 5 0 5 5 0 8 0
procpl 624 1831 0 1787 4 0 4 4 0 8 0
sosppl 128 6 0 6 2 2 0 1 0 8 0
sockpl 400 1077 0 1057 6 3 3 4 0 8 0
mcl64k 65536 11 0 0 2 0 2 2 0 8 0
mcl16k 16384 2 0 0 1 0 1 1 0 8 0
mcl12k 12288 4 0 0 1 0 1 1 0 8 0
mcl9k 9216 4 0 0 1 0 1 1 0 8 0
mcl8k 8192 4 0 0 1 0 1 1 0 8 0
mcl4k 4096 7 0 0 1 0 1 1 0 8 0
mcl2k2 2112 1 0 0 1 0 1 1 0 8 0
mcl2k 2048 170 0 0 21 0 21 21 0 8 0
mtagpl 80 30 0 0 1 0 1 1 0 8 0
mbufpl 256 408 0 0 23 0 23 23 0 8 0
bufpl 280 4382 0 136 304 0 304 304 0 8 0
anonpl 16 71444 0 57395 60 1 59 59 0 124 0
amapchunkpl 152 4010 0 3869 15 9 6 13 0 158 0
amappl16 192 2950 0 2159 42 2 40 41 0 8 0
amappl15 184 1 0 0 1 0 1 1 0 8 0
amappl14 176 33 0 26 1 0 1 1 0 8 0
amappl13 168 33 0 31 1 0 1 1 0 8 0
amappl12 160 202 0 196 2 1 1 1 0 8 0
amappl11 152 69 0 53 1 0 1 1 0 8 0
amappl10 144 23 0 17 1 0 1 1 0 8 0
amappl9 136 463 0 461 1 0 1 1 0 8 0
amappl8 128 450 0 415 2 0 2 2 0 8 0
amappl7 120 133 0 121 1 0 1 1 0 8 0
amappl6 112 24 0 19 1 0 1 1 0 8 0
amappl5 104 753 0 736 1 0 1 1 0 8 0
amappl4 96 508 0 479 1 0 1 1 0 8 0
amappl3 88 137 0 131 1 0 1 1 0 8 0
amappl2 80 4335 0 4261 2 0 2 2 0 8 0
amappl1 72 25299 0 24863 24 14 10 18 0 8 0
amappl 80 2092 0 2046 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 27 0 9 1 0 1 1 0 8 0
uaddrrnd 24 676 0 653 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 676 0 653 1 0 1 1 0 8 0
vmmpekpl 168 9715 0 9684 2 0 2 2 0 8 0
vmmpepl 168 88441 0 86404 135 42 93 115 0 357 2
vmsppl 368 675 0 653 2 0 2 2 0 8 0
pdppl 4096 1360 0 1312 7 0 7 7 0 8 1
pvpl 32 252752 0 235773 155 10 145 148 0 265 2
pmappl 232 675 0 653 2 0 2 2 0 8 0
extentpl 40 46 0 29 1 0 1 1 0 8 0
phpool 112 277 0 11 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: 0x7f7ffffc3e00, 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(3f8,0,65) at x86_bus_space_io_write_1+0x45 sys/arch/amd64/amd64/bus_space.c:759
comcnputc(800,65) at comcnputc+0x131 bus_space_barrier machine/bus.h:481 [inline]
comcnputc(800,65) at comcnputc+0x131 sys/dev/ic/com.c:1254
cnputc(65) at cnputc+0x4c sys/dev/cons.c:239
kputchar(65,5,0) at kputchar+0x219 sys/kern/subr_prf.c:343
kprintf() at kprintf+0x15c sys/kern/subr_prf.c:700
panic(ffffffff821fadd6) at panic+0xf3 vprintf sys/kern/subr_prf.c:528 [inline]
panic(ffffffff821fadd6) at panic+0xf3 sys/kern/subr_prf.c:197
pool_cache_get(ffffffff8265c188) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline]
pool_cache_get(ffffffff8265c188) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884
pool_get(ffffffff8265c188,2) at pool_get+0x91 sys/kern/subr_pool.c:572
m_copym(fffffd8068fccb00,580,274,2) at m_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline]
m_copym(fffffd8068fccb00,580,274,2) at m_copym+0x174 sys/kern/uipc_mbuf.c:667
tcp_output(ffff800000a0c100) at tcp_output+0x15ba sys/netinet/tcp_output.c:673
tcp_usrreq(fffffd806eb3e4b8,9,fffffd8068fccb00,0,0,ffff800020ede4f0) at tcp_usrreq+0xa55
end trace frame: 0xffff800020ecf790, 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(3f8,0,65) at x86_bus_space_io_write_1+0x45 sys/arch/amd64/amd64/bus_space.c:759
comcnputc(800,65) at comcnputc+0x131 bus_space_barrier machine/bus.h:481 [inline]
comcnputc(800,65) at comcnputc+0x131 sys/dev/ic/com.c:1254
cnputc(65) at cnputc+0x4c sys/dev/cons.c:239
kputchar(65,5,0) at kputchar+0x219 sys/kern/subr_prf.c:343
kprintf() at kprintf+0x15c sys/kern/subr_prf.c:700
panic(ffffffff821fadd6) at panic+0xf3 vprintf sys/kern/subr_prf.c:528 [inline]
panic(ffffffff821fadd6) at panic+0xf3 sys/kern/subr_prf.c:197
pool_cache_get(ffffffff8265c188) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline]
pool_cache_get(ffffffff8265c188) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884
pool_get(ffffffff8265c188,2) at pool_get+0x91 sys/kern/subr_pool.c:572
m_copym(fffffd8068fccb00,580,274,2) at m_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline]
m_copym(fffffd8068fccb00,580,274,2) at m_copym+0x174 sys/kern/uipc_mbuf.c:667
tcp_output(ffff800000a0c100) at tcp_output+0x15ba sys/netinet/tcp_output.c:673
tcp_usrreq(fffffd806eb3e4b8,9,fffffd8068fccb00,0,0,ffff800020ede4f0) at tcp_usrreq+0xa55
sosend(fffffd806eb3e4b8,0,ffff800020ecf858,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:549
dofilewritev(ffff800020ede4f0,4,ffff800020ecf858,0,ffff800020ecf940) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365
sys_write(ffff800020ede4f0,ffff800020ecf8f0,ffff800020ecf940) at sys_write+0x83 sys/kern/sys_generic.c:285
syscall(ffff800020ecf9c0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800020ecf9c0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffc7220, count: -19
---
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: bb2235eb Use the same inittodr()/resettodr() implementatio..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=11439248100000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=11651723f14cf622cd2f
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+116517...@syzkaller.appspotmail.com
panic: WApRoNoIl_NcGa: cShPeL_i NtOeTm _LmOaWgiERcE_Dc hOeNc kS:Y SmCbAuLfLp l 2 cp19u 1f3r8e8e0 380l iEXsIt T m0od ai
f
ieStopped at savectx+0xb1: movl $0,%gs:0x530
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*251602 76677 0 0x2 0 0 syz-executor.1
304536 15018 0 0x12 0 1 sshd
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffc3e00, 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 0xfffffd807924f600+16 0x0!=0x2cf2db66438af5ad
ddb{0}> trace
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffc3e00, count: -1
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff800021f911a0
rbx 0
rdx 0xffff800020ec6288
rcx 0
rax 0x3a
r8 0xffffffff81276dcf kprintf+0x16f
r9 0x1
r10 0x25
r11 0xa32ecc101584873a
r12 0
r13 0
r14 0xffff800020ec6288
r15 0
rip 0xffffffff81a323f1 savectx+0xb1
cs 0x8
rflags 0x46
rsp 0xffff800021f91120
ss 0x10
savectx+0xb1: movl $0,%gs:0x530
ddb{0}> show proc
PROC (syz-executor.1) pid=251602 stat=onproc
flags process=2<EXEC,8ORPHAN> proc=0
pri=16, usrpri=54, nice=20
forw=0xffffffffffffffff, list=0xffff800020ec6018,0xffff800020ec7618
process=0xffff800020e93730 user=0xffff800021f8c000, vmspace=0xfffffd806e954178
estcpu=4, cpticks=1, pctcpu=0.1
user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
15739 474924 76677 0 2 0 syz-executor.1
78737 524239 84441 0 3 0x80 nanosleep syz-executor.0
78737 210021 84441 0 3 0x4000080 kqread syz-executor.0
78737 8135 84441 0 3 0x4000080 fsleep syz-executor.0
*76677 251602 3169 0 7 0x2 syz-executor.1
51277 224828 0 0 3 0x14200 bored sosplice
84441 485831 3169 0 3 0x82 nanosleep syz-executor.0
3169 222194 81280 0 3 0x82 thrsleep syz-fuzzer
3169 4011 81280 0 3 0x4000082 nanosleep syz-fuzzer
3169 166601 81280 0 3 0x4000082 thrsleep syz-fuzzer
3169 371861 81280 0 2 0x4000002 syz-fuzzer
3169 232269 81280 0 3 0x4000082 thrsleep syz-fuzzer
3169 253859 81280 0 3 0x4000082 thrsleep syz-fuzzer
3169 377772 81280 0 3 0x4000082 thrsleep syz-fuzzer
3169 13526 81280 0 3 0x4000082 thrsleep syz-fuzzer
3169 376428 81280 0 2 0x4000002 syz-fuzzer
3169 143812 81280 0 3 0x4000082 thrsleep syz-fuzzer
81280 144160 15018 0 3 0x10008a pause ksh
15018 304536 64412 0 7 0x12 sshd
45380 275689 1 0 3 0x100083 ttyin getty
64412 57130 1 0 3 0x80 select sshd
6698 429670 85999 74 3 0x100092 bpf pflogd
85999 439587 1 0 3 0x80 netio pflogd
65761 113064 23261 73 3 0x100090 kqread syslogd
23261 387370 1 0 3 0x100082 netio syslogd
9676 298564 1 77 3 0x100090 poll dhclient
24961 355424 1 0 3 0x80 poll dhclient
62803 304467 0 0 3 0x14200 bored smr
99623 62570 0 0 3 0x14200 pgzero zerothread
46809 148793 0 0 3 0x14200 aiodoned aiodoned
20414 321504 0 0 3 0x14200 syncer update
45258 433071 0 0 3 0x14200 cleaner cleaner
24062 254603 0 0 3 0x14200 reaper reaper
87274 388986 0 0 3 0x14200 pgdaemon pagedaemon
69116 215175 0 0 3 0x14200 bored crynlk
23226 287443 0 0 3 0x14200 bored crypto
15495 479087 0 0 3 0x40014200 acpi0 acpi0
21870 249276 0 0 3 0x40014200 idle1
62770 418575 0 0 2 0x14200 softnet
12757 200048 0 0 3 0x14200 bored systqmp
54989 187234 0 0 3 0x14200 bored systq
81536 415508 0 0 3 0x40014200 bored softclock
18291 64066 0 0 3 0x40014200 idle0
1 325558 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 (0xffffffff82673590)
#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_put+0x64 sys/kern/subr_pool.c:792
#4 uvm_unmap_detach+0x231 sys/uvm/uvm_map.c:1581
#5 uvm_map+0xe0c sys/uvm/uvm_map.c:1420
#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 76677 (syz-executor.1) thread 0xffff800020ec6288 (251602)
exclusive kernel_lock &kernel_lock r = 1 (0xffffffff8268a7c8)
#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 (0xffffffff82673590)
#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_put+0x64 sys/kern/subr_pool.c:792
#4 uvm_unmap_detach+0x231 sys/uvm/uvm_map.c:1581
#5 uvm_map+0xe0c sys/uvm/uvm_map.c:1420
#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 15018 (sshd) thread 0xffff800020ede4f0 (304536)
exclusive rwlock netlock r = 0 (0xffffffff824ddc08)
#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 9527 6427K 7069K 78643K 11364 0
pcb 13 8K 8K 78643K 110 0
rtable 75 2K 3K 78643K 336 0
ifaddr 79 15K 16K 78643K 149 0
counters 43 33K 34K 78643K 63 0
ioctlops 0 0K 4K 78643K 1495 0
iov 0 0K 32K 78643K 77 0
mount 1 1K 1K 78643K 1 0
vnodes 1223 77K 77K 78643K 1611 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 5K 78643K 10 0
VM map 2 1K 1K 78643K 2 0
sem 12 0K 1K 78643K 89 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1823 197K 290K 78643K 12980 0
file desc 6 17K 25K 78643K 471 0
sigio 0 0K 0K 78643K 5 0
proc 61 63K 95K 78643K 528 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 51 0
in_multi 60 3K 3K 78643K 135 0
ether_multi 1 0K 0K 78643K 23 0
mrt 0 0K 0K 78643K 6 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 258 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 131 72K 72K 78643K 2657 0
UVM aobj 19 2K 2K 78643K 28 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 89 0
NDP 13 0K 0K 78643K 29 0
temp 113 3040K 3113K 78643K 13201 0
kqueue 4 6K 16K 78643K 62 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 4 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 80 41 0 39 1 0 1 1 0 8 0
rtentry 112 62 0 33 2 0 2 2 0 8 0
unpcb 120 261 0 251 1 0 1 1 0 8 0
syncache 264 5 0 5 2 2 0 1 0 8 0
tcpqe 32 1 0 1 1 1 0 1 0 8 0
tcpcb 544 229 0 224 1 0 1 1 0 8 0
inpcb 280 772 0 764 4 2 2 2 0 8 1
rttmr 72 1 0 1 1 1 0 1 0 8 0
nd6 48 10 0 6 1 0 1 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 10 0 9 2 1 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 56 0 34 1 0 1 1 0 8 0
pfstkey 112 56 0 34 1 0 1 1 0 8 0
pfstate 328 56 0 34 3 0 3 3 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 256 274 0 138 12 3 9 12 0 8 0
art_table 32 276 0 138 2 0 2 2 0 8 0
art_node 16 61 0 37 1 0 1 1 0 8 0
sysvmsgpl 40 22 0 17 1 0 1 1 0 8 0
semupl 112 1 0 1 1 1 0 1 0 8 0
semapl 112 83 0 73 1 0 1 1 0 8 0
shmpl 112 26 0 9 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 2260 0 855 89 0 89 89 0 8 0
ffsino 272 2260 0 855 95 0 95 95 0 8 0
nchpl 144 3083 0 1490 60 0 60 60 0 8 0
uvmvnodes 72 2508 0 0 46 0 46 46 0 8 0
vnodes 208 2508 0 0 132 0 132 132 0 8 0
namei 1024 9294 0 9294 3 2 1 1 0 8 1
percpumem 16 42 0 10 1 0 1 1 0 8 0
vcpupl 1984 6 0 0 1 0 1 1 0 8 0
vmpool 560 8 0 2 1 0 1 1 0 8 0
scxspl 192 8648 0 8648 8 7 1 5 0 8 1
plimitpl 152 50 0 42 1 0 1 1 0 8 0
sigapl 424 684 0 651 4 0 4 4 0 8 0
futexpl 56 7333 0 7332 3 2 1 1 0 8 0
knotepl 112 152 0 133 1 0 1 1 0 8 0
kqueuepl 144 161 0 157 1 0 1 1 0 8 0
pipelkpl 48 183 0 173 1 0 1 1 0 8 0
pipepl 120 366 0 347 2 1 1 2 0 8 0
fdescpl 496 668 0 651 3 0 3 3 0 8 0
filepl 152 4714 0 4608 7 2 5 7 0 8 0
lockfpl 104 251 0 250 1 0 1 1 0 8 0
lockfspl 48 73 0 72 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 96 686 0 677 1 0 1 1 0 8 0
zombiepl 144 651 0 651 1 0 1 1 0 8 1
processpl 984 684 0 651 5 0 5 5 0 8 0
procpl 624 1831 0 1787 4 0 4 4 0 8 0
sosppl 128 6 0 6 2 2 0 1 0 8 0
sockpl 400 1077 0 1057 6 3 3 4 0 8 0
mcl64k 65536 11 0 0 2 0 2 2 0 8 0
mcl16k 16384 2 0 0 1 0 1 1 0 8 0
mcl12k 12288 4 0 0 1 0 1 1 0 8 0
mcl9k 9216 4 0 0 1 0 1 1 0 8 0
mcl8k 8192 4 0 0 1 0 1 1 0 8 0
mcl4k 4096 7 0 0 1 0 1 1 0 8 0
mcl2k2 2112 1 0 0 1 0 1 1 0 8 0
mcl2k 2048 170 0 0 21 0 21 21 0 8 0
mtagpl 80 30 0 0 1 0 1 1 0 8 0
mbufpl 256 408 0 0 23 0 23 23 0 8 0
bufpl 280 4382 0 136 304 0 304 304 0 8 0
anonpl 16 71444 0 57395 60 1 59 59 0 124 0
amapchunkpl 152 4010 0 3869 15 9 6 13 0 158 0
amappl16 192 2950 0 2159 42 2 40 41 0 8 0
amappl15 184 1 0 0 1 0 1 1 0 8 0
amappl14 176 33 0 26 1 0 1 1 0 8 0
amappl13 168 33 0 31 1 0 1 1 0 8 0
amappl12 160 202 0 196 2 1 1 1 0 8 0
amappl11 152 69 0 53 1 0 1 1 0 8 0
amappl10 144 23 0 17 1 0 1 1 0 8 0
amappl9 136 463 0 461 1 0 1 1 0 8 0
amappl8 128 450 0 415 2 0 2 2 0 8 0
amappl7 120 133 0 121 1 0 1 1 0 8 0
amappl6 112 24 0 19 1 0 1 1 0 8 0
amappl5 104 753 0 736 1 0 1 1 0 8 0
amappl4 96 508 0 479 1 0 1 1 0 8 0
amappl3 88 137 0 131 1 0 1 1 0 8 0
amappl2 80 4335 0 4261 2 0 2 2 0 8 0
amappl1 72 25299 0 24863 24 14 10 18 0 8 0
amappl 80 2092 0 2046 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 27 0 9 1 0 1 1 0 8 0
uaddrrnd 24 676 0 653 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 676 0 653 1 0 1 1 0 8 0
vmmpekpl 168 9715 0 9684 2 0 2 2 0 8 0
vmmpepl 168 88441 0 86404 135 42 93 115 0 357 2
vmsppl 368 675 0 653 2 0 2 2 0 8 0
pdppl 4096 1360 0 1312 7 0 7 7 0 8 1
pvpl 32 252752 0 235773 155 10 145 148 0 265 2
pmappl 232 675 0 653 2 0 2 2 0 8 0
extentpl 40 46 0 29 1 0 1 1 0 8 0
phpool 112 277 0 11 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: 0x7f7ffffc3e00, 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(3f8,0,65) at x86_bus_space_io_write_1+0x45 sys/arch/amd64/amd64/bus_space.c:759
comcnputc(800,65) at comcnputc+0x131 bus_space_barrier machine/bus.h:481 [inline]
comcnputc(800,65) at comcnputc+0x131 sys/dev/ic/com.c:1254
cnputc(65) at cnputc+0x4c sys/dev/cons.c:239
kputchar(65,5,0) at kputchar+0x219 sys/kern/subr_prf.c:343
kprintf() at kprintf+0x15c sys/kern/subr_prf.c:700
panic(ffffffff821fadd6) at panic+0xf3 vprintf sys/kern/subr_prf.c:528 [inline]
panic(ffffffff821fadd6) at panic+0xf3 sys/kern/subr_prf.c:197
pool_cache_get(ffffffff8265c188) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline]
pool_cache_get(ffffffff8265c188) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884
pool_get(ffffffff8265c188,2) at pool_get+0x91 sys/kern/subr_pool.c:572
m_copym(fffffd8068fccb00,580,274,2) at m_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline]
m_copym(fffffd8068fccb00,580,274,2) at m_copym+0x174 sys/kern/uipc_mbuf.c:667
tcp_output(ffff800000a0c100) at tcp_output+0x15ba sys/netinet/tcp_output.c:673
tcp_usrreq(fffffd806eb3e4b8,9,fffffd8068fccb00,0,0,ffff800020ede4f0) at tcp_usrreq+0xa55
end trace frame: 0xffff800020ecf790, 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(3f8,0,65) at x86_bus_space_io_write_1+0x45 sys/arch/amd64/amd64/bus_space.c:759
comcnputc(800,65) at comcnputc+0x131 bus_space_barrier machine/bus.h:481 [inline]
comcnputc(800,65) at comcnputc+0x131 sys/dev/ic/com.c:1254
cnputc(65) at cnputc+0x4c sys/dev/cons.c:239
kputchar(65,5,0) at kputchar+0x219 sys/kern/subr_prf.c:343
kprintf() at kprintf+0x15c sys/kern/subr_prf.c:700
panic(ffffffff821fadd6) at panic+0xf3 vprintf sys/kern/subr_prf.c:528 [inline]
panic(ffffffff821fadd6) at panic+0xf3 sys/kern/subr_prf.c:197
pool_cache_get(ffffffff8265c188) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline]
pool_cache_get(ffffffff8265c188) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884
pool_get(ffffffff8265c188,2) at pool_get+0x91 sys/kern/subr_pool.c:572
m_copym(fffffd8068fccb00,580,274,2) at m_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline]
m_copym(fffffd8068fccb00,580,274,2) at m_copym+0x174 sys/kern/uipc_mbuf.c:667
tcp_output(ffff800000a0c100) at tcp_output+0x15ba sys/netinet/tcp_output.c:673
tcp_usrreq(fffffd806eb3e4b8,9,fffffd8068fccb00,0,0,ffff800020ede4f0) at tcp_usrreq+0xa55
sosend(fffffd806eb3e4b8,0,ffff800020ecf858,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:549
dofilewritev(ffff800020ede4f0,4,ffff800020ecf858,0,ffff800020ecf940) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365
sys_write(ffff800020ede4f0,ffff800020ecf8f0,ffff800020ecf940) at sys_write+0x83 sys/kern/sys_generic.c:285
syscall(ffff800020ecf9c0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800020ecf9c0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffc7220, count: -19
---
This bug is generated by a bot. It may contain errors.
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Greg Steuck
May 10, 2020, 10:43:24 AM5/10/20
to syzbot, syzkaller-o...@googlegroups.com
#syz dup: pool: cpu free list modified: mbufpl
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