panic: pWoARoNlI_NcGa:ch SeP_iLt eNmO_Tm agLicO_WEcRhEecDk :ON mSbYuSfCplAL Lc pu13 7f re-e 27l2i9st2 m8 oEdXiIfTi e0d
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syzbot
Nov 15, 2019, 2:25:12 AM11/15/19
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: 3d133dcf Change window-size default from smallest to latest.
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=14698772e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=26ca0a9c07f16a3a
dashboard link: https://syzkaller.appspot.com/bug?extid=f9f46625e2f834d829c1
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+f9f466...@syzkaller.appspotmail.com
panic: pWoARoNlI_NcGa:ch SeP_iLt eNmO_Tm agLicO_WEcRhEecDk :ON
mSbYuSfCplAL Lc pu13 7f re-e 27l2i9st2 m8 oEdXiIfTi e0d :9
i
tStopped at savectx+0xb1: movl $0,%gs:0x530
TID PID UID PRFLAGS PFLAGS CPU COMMAND
* 28502 50717 0 0x2 0 0 syz-executor.1
69215 4209 0 0x14000 0x200 1 softnet
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffbd5d0, 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
0xfffffd80768c3400+16 0x0!=0x4e4fd0d8bf0b3399
ddb{0}> trace
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffbd5d0, count: -1
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff800022d6d450
rbx 0
rdx 0xffff800020ab09f8
rcx 0
rax 0x39
r8 0xffffffff81c1ab0f kprintf+0x16f
r9 0x1
r10 0x25
r11 0xe397b449b0232284
r12 0
r13 0
r14 0xffff800020ab09f8
r15 0
rip 0xffffffff819243f1 savectx+0xb1
cs 0x8
rflags 0x46
rsp 0xffff800022d6d3d0
ss 0x10
savectx+0xb1: movl $0,%gs:0x530
ddb{0}> show proc
PROC (syz-executor.1) pid=28502 stat=onproc
flags process=2<EXEC> proc=0
pri=86, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff800020ab0508,0xffff800020ab1170
process=0xffff800020addc00 user=0xffff800022d68000,
vmspace=0xfffffd807f0072e0
estcpu=36, cpticks=9, pctcpu=0.9
user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
96310 65809 10544 0 3 0x82 nanosleep syz-executor.0
*50717 28502 10544 0 7 0x2 syz-executor.1
64923 354748 0 0 3 0x14200 acct acct
40868 476284 0 0 3 0x14200 bored sosplice
10544 268512 66214 0 3 0x82 thrsleep syz-fuzzer
10544 497062 66214 0 3 0x4000082 nanosleep syz-fuzzer
10544 411199 66214 0 3 0x4000082 thrsleep syz-fuzzer
10544 465005 66214 0 3 0x4000082 thrsleep syz-fuzzer
10544 265860 66214 0 3 0x4000082 thrsleep syz-fuzzer
10544 390350 66214 0 3 0x4000082 thrsleep syz-fuzzer
10544 159209 66214 0 3 0x4000082 thrsleep syz-fuzzer
10544 439440 66214 0 3 0x4000082 thrsleep syz-fuzzer
10544 383783 66214 0 3 0x4000082 thrsleep syz-fuzzer
10544 91725 66214 0 3 0x4000082 kqread syz-fuzzer
66214 486344 72088 0 3 0x10008a pause ksh
72088 37143 62899 0 3 0x92 select sshd
16743 64313 1 0 3 0x100083 ttyin getty
62899 304690 1 0 3 0x80 select sshd
20962 305118 17644 74 3 0x100092 bpf pflogd
17644 415768 1 0 3 0x80 netio pflogd
6834 7533 74197 73 3 0x100090 kqread syslogd
74197 69528 1 0 3 0x100082 netio syslogd
9566 135052 1 77 3 0x100090 poll dhclient
79309 368057 1 0 3 0x80 poll dhclient
24154 375391 0 0 3 0x14200 pgzero zerothread
52202 62672 0 0 3 0x14200 aiodoned aiodoned
29071 450582 0 0 3 0x14200 syncer update
19478 108513 0 0 3 0x14200 cleaner cleaner
81960 285571 0 0 3 0x14200 reaper reaper
51970 151287 0 0 3 0x14200 pgdaemon pagedaemon
41622 399972 0 0 3 0x14200 bored crynlk
94981 35864 0 0 3 0x14200 bored crypto
99722 366047 0 0 3 0x40014200 acpi0 acpi0
51593 9755 0 0 3 0x40014200 idle1
4209 69215 0 0 7 0x14200 softnet
66767 341452 0 0 3 0x14200 bored systqmp
30780 443579 0 0 3 0x14200 bored systq
37467 24326 0 0 3 0x40014200 bored softclock
95880 458952 0 0 3 0x40014200 idle0
39663 13040 0 0 3 0x14200 bored smr
1 328400 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &bq->bufq_mtx r = 0 (0xffff800000172968)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 bufq_dequeue+0x2c sys/kern/kern_bufq.c:198
#4 sdstart+0x9f sys/scsi/sd.c:681
#5 scsi_iopool_run+0x129 scsi_ioh_pending sys/scsi/scsi_base.c:394 [inline]
#5 scsi_iopool_run+0x129 sys/scsi/scsi_base.c:410
#6 scsi_xsh_runqueue+0x210 sys/scsi/scsi_base.c:586
#7 scsi_xsh_add+0xc9 sys/scsi/scsi_base.c:525
#8 sdstrategy+0x187 sys/scsi/sd.c:582
#9 spec_strategy+0x74 sys/kern/spec_vnops.c:468
#10 VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:727
#11 bwrite+0x1b9 sys/kern/vfs_bio.c:738
#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:1357
#15 VOP_RMDIR+0xf8 sys/kern/vfs_vops.c:474
#16 dounlinkat+0x14c sys/kern/vfs_syscalls.c:1818
#17 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#17 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#18 Xsyscall+0x128
Process 50717 (syz-executor.1) thread 0xffff800020ab09f8 (28502)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82656068)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 __mp_acquire_count+0x51 sys/kern/kern_lock.c:227
#2 mi_switch+0x392 sys/kern/sched_bsd.c:434
#3 sleep_finish+0x113 sys/kern/kern_synch.c:374
#4 sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:403
[inline]
#4 sleep_finish_all+0x32 sys/kern/kern_synch.c:183
#5 tsleep+0x1cf sys/kern/kern_synch.c:153
#6 biowait+0xa1 sys/kern/vfs_bio.c:1231
#7 bwrite+0x1e4 sys/kern/vfs_bio.c:747
#8 ufs_dirremove+0x291
#9 ufs_rmdir+0x247 sys/ufs/ufs/ufs_vnops.c:1330
#10 VOP_RMDIR+0xf8 sys/kern/vfs_vops.c:474
#11 dounlinkat+0x14c sys/kern/vfs_syscalls.c:1818
#12 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#12 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#13 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd806128f0a8)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 rw_enter+0x447 sys/kern/kern_rwlock.c:306
#2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435
#3 VOP_LOCK+0xf0 sys/kern/vfs_vops.c:615
#4 vn_lock+0x81 sys/kern/vfs_vnops.c:571
#5 vget+0x1c3 sys/kern/vfs_subr.c:672
#6 ufs_ihashget+0x141 sys/ufs/ufs/ufs_ihash.c:119
#7 ffs_vget+0x74 sys/ufs/ffs/ffs_vfsops.c:1323
#8 ufs_lookup+0x14b4 sys/ufs/ufs/ufs_lookup.c:487
#9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:91
#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:1785
#13 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#13 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#14 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd806128f1b8)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 rw_enter+0x447 sys/kern/kern_rwlock.c:306
#2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435
#3 VOP_LOCK+0xf0 sys/kern/vfs_vops.c:615
#4 vn_lock+0x81 sys/kern/vfs_vnops.c:571
#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:1785
#8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#9 Xsyscall+0x128
exclusive mutex &bq->bufq_mtx r = 0 (0xffff800000172968)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 bufq_dequeue+0x2c sys/kern/kern_bufq.c:198
#4 sdstart+0x9f sys/scsi/sd.c:681
#5 scsi_iopool_run+0x129 scsi_ioh_pending sys/scsi/scsi_base.c:394 [inline]
#5 scsi_iopool_run+0x129 sys/scsi/scsi_base.c:410
#6 scsi_xsh_runqueue+0x210 sys/scsi/scsi_base.c:586
#7 scsi_xsh_add+0xc9 sys/scsi/scsi_base.c:525
#8 sdstrategy+0x187 sys/scsi/sd.c:582
#9 spec_strategy+0x74 sys/kern/spec_vnops.c:468
#10 VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:727
#11 bwrite+0x1b9 sys/kern/vfs_bio.c:738
#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:1357
#15 VOP_RMDIR+0xf8 sys/kern/vfs_vops.c:474
#16 dounlinkat+0x14c sys/kern/vfs_syscalls.c:1818
#17 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#17 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#18 Xsyscall+0x128
Process 4209 (softnet) thread 0xffff800020a104f0 (69215)
shared rwlock netlock r = 0 (0xffffffff825124c8)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 if_input_process+0x84 sys/net/if.c:942
#2 ifiq_process+0x80 sys/net/ifq.c:607
#3 taskq_thread+0x9c sys/kern/kern_task.c:368
#4 proc_trampoline+0x1c
shared rwlock softnet r = 0 (0xffff8000000230e0)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 taskq_thread+0x8f sys/kern/kern_task.c:367
#2 proc_trampoline+0x1c
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim
devbuf 9516 7051K 8152K 78643K 13093 0 0
pcb 13 8K 8K 78643K 130 0 0
rtable 116 5K 5K 78643K 525 0 0
ifaddr 93 16K 16K 78643K 185 0 0
counters 39 33K 33K 78643K 39 0 0
ioctlops 0 0K 4K 78643K 1485 0 0
iov 0 0K 16K 78643K 73 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1236 78K 78K 78643K 1959 0 0
UFS quota 1 32K 32K 78643K 1 0 0
UFS mount 5 36K 36K 78643K 5 0 0
shm 2 1K 5K 78643K 7 0 0
VM map 8 4K 4K 78643K 10 0 0
sem 12 1K 1K 78643K 53 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1809 196K 290K 78643K 12766 0 0
file desc 4 9K 25K 78643K 469 0 0
sigio 0 0K 0K 78643K 6 0 0
proc 60 63K 95K 78643K 572 0 0
subproc 32 2K 2K 78643K 73 0 0
NFS srvsock 1 0K 0K 78643K 1 0 0
NFS daemon 1 16K 16K 78643K 1 0 0
ip_moptions 0 0K 0K 78643K 38 0 0
in_multi 70 3K 3K 78643K 104 0 0
ether_multi 1 0K 0K 78643K 4 0 0
mrt 0 0K 0K 78643K 2 0 0
ISOFS mount 1 32K 32K 78643K 1 0 0
MSDOSFS mount 1 16K 16K 78643K 1 0 0
ttys 60 265K 265K 78643K 60 0 0
exec 0 0K 1K 78643K 292 0 0
pagedep 1 8K 8K 78643K 1 0 0
inodedep 1 32K 32K 78643K 1 0 0
newblk 1 0K 0K 78643K 1 0 0
VM swap 7 26K 26K 78643K 7 0 0
UVM amap 110 39K 40K 78643K 2530 0 0
UVM aobj 51 4K 4K 78643K 53 0 0
memdesc 1 4K 4K 78643K 1 0 0
crypto data 1 1K 1K 78643K 1 0 0
ip6_options 0 0K 0K 78643K 105 0 0
NDP 12 0K 0K 78643K 39 0 0
temp 135 3551K 4191K 78643K 13766 0 0
kqueue 0 0K 0K 78643K 10 0 0
SYN cache 2 16K 16K 78643K 2 0 0
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg
Idle
arp 64 21 0 14 1 0 1 1 0
8 0
plcache 128 20 0 0 1 0 1 1 0
8 0
rtpcb 80 61 0 59 1 0 1 1 0
8 0
rtentry 112 92 0 47 2 0 2 2 0
8 0
unpcb 120 239 0 229 1 0 1 1 0
8 0
syncache 264 4 0 4 1 1 0 1 0
8 0
tcpqe 32 122 0 122 1 1 0 1 0
8 0
tcpcb 544 192 0 188 2 1 1 2 0
8 0
inpcb 280 1374 0 1367 14 6 8 8 0
8 7
nd6 48 9 0 5 1 0 1 1 0
8 0
pkpcb 40 8 0 8 1 1 0 1 0
8 0
ppxss 1128 16 0 16 3 2 1 1 0
8 1
pffrag 232 21 0 21 3 2 1 1 0
482 1
pffrnode 88 21 0 21 3 2 1 1 0
8 1
pffrent 40 505 0 505 3 2 1 1 0
8 1
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 51 0 11 1 0 1 1 0
8 0
pfstkey 112 51 0 11 2 0 2 2 0
8 0
pfstate 328 51 0 11 4 0 4 4 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 256 379 0 152 15 0 15 15 0
8 0
art_table 32 380 0 152 2 0 2 2 0
8 0
art_node 16 91 0 50 1 0 1 1 0
8 0
sysvmsgpl 40 47 0 27 1 0 1 1 0
8 0
semupl 112 2 0 2 1 1 0 1 0
8 0
semapl 112 49 0 39 1 0 1 1 0
8 0
shmpl 112 51 0 2 2 0 2 2 0
8 0
dirhash 1024 17 0 0 3 0 3 3 0
8 0
dino1pl 128 2082 0 679 46 0 46 46 0
8 0
ffsino 272 2082 0 679 96 1 95 95 0
8 0
nchpl 144 3079 0 1476 61 0 61 61 0
8 0
uvmvnodes 72 2752 0 0 51 0 51 51 0
8 0
vnodes 208 2752 0 0 145 0 145 145 0
8 0
namei 1024 9358 0 9358 1 0 1 1 0
8 1
percpumem 16 30 0 0 1 0 1 1 0
8 0
vcpupl 1984 6 0 0 1 0 1 1 0
8 0
vmpool 552 8 0 2 1 0 1 1 0
8 0
scxspl 192 8567 0 8567 7 3 4 4 0
8 4
plimitpl 152 51 0 43 1 0 1 1 0
8 0
sigapl 432 661 0 647 3 1 2 3 0
8 0
futexpl 56 14119 0 14119 1 0 1 1 0
8 1
knotepl 112 150 0 131 1 0 1 1 0
8 0
kqueuepl 104 108 0 106 1 0 1 1 0
8 0
pipepl 160 420 0 401 4 2 2 2 0
8 1
fdescpl 488 662 0 647 3 0 3 3 0
8 0
filepl 152 5788 0 5688 10 2 8 8 0
8 4
lockfpl 104 186 0 184 1 0 1 1 0
8 0
lockfspl 48 63 0 61 1 0 1 1 0
8 0
sessionpl 112 20 0 9 1 0 1 1 0
8 0
pgrppl 48 26 0 15 1 0 1 1 0
8 0
ucredpl 96 568 0 559 1 0 1 1 0
8 0
zombiepl 144 647 0 646 1 0 1 1 0
8 0
processpl 896 679 0 646 4 0 4 4 0
8 0
procpl 632 1666 0 1624 5 0 5 5 0
8 1
srpgc 64 2 0 2 1 1 0 1 0
8 0
sosppl 128 356 0 356 3 1 2 2 0
8 2
sockpl 384 1691 0 1672 19 7 12 12 0 8
10
mcl64k 65536 10 0 0 2 0 2 2 0
8 0
mcl16k 16384 3 0 0 1 0 1 1 0
8 0
mcl12k 12288 6 0 0 1 0 1 1 0
8 0
mcl9k 9216 6 0 0 1 0 1 1 0
8 0
mcl8k 8192 6 0 0 1 0 1 1 0
8 0
mcl4k 4096 12 0 0 2 0 2 2 0
8 0
mcl2k2 2112 3 0 0 1 0 1 1 0
8 0
mcl2k 2048 182 0 0 22 0 22 22 0
8 0
mtagpl 80 30 0 0 1 0 1 1 0
8 0
mbufpl 256 343 0 0 21 0 21 21 0
8 0
bufpl 256 7408 0 1309 382 0 382 382 0
8 0
anonpl 16 83782 0 65190 105 1 104 104 0 124
11
amapchunkpl 152 4007 0 3858 13 2 11 12 0
158 3
amappl16 192 3438 0 2172 75 3 72 75 0
8 8
amappl15 184 2 0 1 1 0 1 1 0
8 0
amappl14 176 60 0 56 1 0 1 1 0
8 0
amappl13 168 218 0 216 1 0 1 1 0
8 0
amappl12 160 4 0 3 2 1 1 1 0
8 0
amappl11 152 84 0 67 1 0 1 1 0
8 0
amappl10 144 19 0 12 1 0 1 1 0
8 0
amappl9 136 820 0 817 1 0 1 1 0
8 0
amappl8 128 364 0 341 1 0 1 1 0
8 0
amappl7 120 48 0 42 1 0 1 1 0
8 0
amappl6 112 73 0 63 1 0 1 1 0
8 0
amappl5 104 149 0 135 1 0 1 1 0
8 0
amappl4 96 1068 0 1034 2 1 1 2 0
8 0
amappl3 88 134 0 129 1 0 1 1 0
8 0
amappl2 80 4254 0 4189 3 1 2 3 0
8 0
amappl1 72 23949 0 23527 26 16 10 20 0
8 0
amappl 80 1950 0 1905 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 52 0 2 1 0 1 1 0
8 0
uaddrrnd 24 670 0 647 1 0 1 1 0
8 0
uaddrbest 32 2 0 0 1 0 1 1 0
8 0
uaddr 24 670 0 647 1 0 1 1 0
8 0
vmmpekpl 168 9442 0 9404 2 0 2 2 0
8 0
vmmpepl 168 90046 0 87703 179 23 156 156 0 357
43
vmsppl 368 661 0 647 2 0 2 2 0
8 0
pdppl 4096 1347 0 1304 6 0 6 6 0
8 0
pvpl 32 257530 0 236284 244 4 240 240 0 265
34
pmappl 232 669 0 649 3 1 2 2 0
8 0
extentpl 40 46 0 29 1 0 1 1 0
8 0
phpool 112 561 0 5 16 0 16 16 0
8 0
---
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: 3d133dcf Change window-size default from smallest to latest.
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=14698772e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=26ca0a9c07f16a3a
dashboard link: https://syzkaller.appspot.com/bug?extid=f9f46625e2f834d829c1
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+f9f466...@syzkaller.appspotmail.com
panic: pWoARoNlI_NcGa:ch SeP_iLt eNmO_Tm agLicO_WEcRhEecDk :ON
mSbYuSfCplAL Lc pu13 7f re-e 27l2i9st2 m8 oEdXiIfTi e0d :9
i
tStopped at savectx+0xb1: movl $0,%gs:0x530
TID PID UID PRFLAGS PFLAGS CPU COMMAND
* 28502 50717 0 0x2 0 0 syz-executor.1
69215 4209 0 0x14000 0x200 1 softnet
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffbd5d0, 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
0xfffffd80768c3400+16 0x0!=0x4e4fd0d8bf0b3399
ddb{0}> trace
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffbd5d0, count: -1
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff800022d6d450
rbx 0
rdx 0xffff800020ab09f8
rcx 0
rax 0x39
r8 0xffffffff81c1ab0f kprintf+0x16f
r9 0x1
r10 0x25
r11 0xe397b449b0232284
r12 0
r13 0
r14 0xffff800020ab09f8
r15 0
rip 0xffffffff819243f1 savectx+0xb1
cs 0x8
rflags 0x46
rsp 0xffff800022d6d3d0
ss 0x10
savectx+0xb1: movl $0,%gs:0x530
ddb{0}> show proc
PROC (syz-executor.1) pid=28502 stat=onproc
flags process=2<EXEC> proc=0
pri=86, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff800020ab0508,0xffff800020ab1170
process=0xffff800020addc00 user=0xffff800022d68000,
vmspace=0xfffffd807f0072e0
estcpu=36, cpticks=9, pctcpu=0.9
user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
96310 65809 10544 0 3 0x82 nanosleep syz-executor.0
*50717 28502 10544 0 7 0x2 syz-executor.1
64923 354748 0 0 3 0x14200 acct acct
40868 476284 0 0 3 0x14200 bored sosplice
10544 268512 66214 0 3 0x82 thrsleep syz-fuzzer
10544 497062 66214 0 3 0x4000082 nanosleep syz-fuzzer
10544 411199 66214 0 3 0x4000082 thrsleep syz-fuzzer
10544 465005 66214 0 3 0x4000082 thrsleep syz-fuzzer
10544 265860 66214 0 3 0x4000082 thrsleep syz-fuzzer
10544 390350 66214 0 3 0x4000082 thrsleep syz-fuzzer
10544 159209 66214 0 3 0x4000082 thrsleep syz-fuzzer
10544 439440 66214 0 3 0x4000082 thrsleep syz-fuzzer
10544 383783 66214 0 3 0x4000082 thrsleep syz-fuzzer
10544 91725 66214 0 3 0x4000082 kqread syz-fuzzer
66214 486344 72088 0 3 0x10008a pause ksh
72088 37143 62899 0 3 0x92 select sshd
16743 64313 1 0 3 0x100083 ttyin getty
62899 304690 1 0 3 0x80 select sshd
20962 305118 17644 74 3 0x100092 bpf pflogd
17644 415768 1 0 3 0x80 netio pflogd
6834 7533 74197 73 3 0x100090 kqread syslogd
74197 69528 1 0 3 0x100082 netio syslogd
9566 135052 1 77 3 0x100090 poll dhclient
79309 368057 1 0 3 0x80 poll dhclient
24154 375391 0 0 3 0x14200 pgzero zerothread
52202 62672 0 0 3 0x14200 aiodoned aiodoned
29071 450582 0 0 3 0x14200 syncer update
19478 108513 0 0 3 0x14200 cleaner cleaner
81960 285571 0 0 3 0x14200 reaper reaper
51970 151287 0 0 3 0x14200 pgdaemon pagedaemon
41622 399972 0 0 3 0x14200 bored crynlk
94981 35864 0 0 3 0x14200 bored crypto
99722 366047 0 0 3 0x40014200 acpi0 acpi0
51593 9755 0 0 3 0x40014200 idle1
4209 69215 0 0 7 0x14200 softnet
66767 341452 0 0 3 0x14200 bored systqmp
30780 443579 0 0 3 0x14200 bored systq
37467 24326 0 0 3 0x40014200 bored softclock
95880 458952 0 0 3 0x40014200 idle0
39663 13040 0 0 3 0x14200 bored smr
1 328400 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &bq->bufq_mtx r = 0 (0xffff800000172968)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 bufq_dequeue+0x2c sys/kern/kern_bufq.c:198
#4 sdstart+0x9f sys/scsi/sd.c:681
#5 scsi_iopool_run+0x129 scsi_ioh_pending sys/scsi/scsi_base.c:394 [inline]
#5 scsi_iopool_run+0x129 sys/scsi/scsi_base.c:410
#6 scsi_xsh_runqueue+0x210 sys/scsi/scsi_base.c:586
#7 scsi_xsh_add+0xc9 sys/scsi/scsi_base.c:525
#8 sdstrategy+0x187 sys/scsi/sd.c:582
#9 spec_strategy+0x74 sys/kern/spec_vnops.c:468
#10 VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:727
#11 bwrite+0x1b9 sys/kern/vfs_bio.c:738
#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:1357
#15 VOP_RMDIR+0xf8 sys/kern/vfs_vops.c:474
#16 dounlinkat+0x14c sys/kern/vfs_syscalls.c:1818
#17 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#17 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#18 Xsyscall+0x128
Process 50717 (syz-executor.1) thread 0xffff800020ab09f8 (28502)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82656068)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 __mp_acquire_count+0x51 sys/kern/kern_lock.c:227
#2 mi_switch+0x392 sys/kern/sched_bsd.c:434
#3 sleep_finish+0x113 sys/kern/kern_synch.c:374
#4 sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:403
[inline]
#4 sleep_finish_all+0x32 sys/kern/kern_synch.c:183
#5 tsleep+0x1cf sys/kern/kern_synch.c:153
#6 biowait+0xa1 sys/kern/vfs_bio.c:1231
#7 bwrite+0x1e4 sys/kern/vfs_bio.c:747
#8 ufs_dirremove+0x291
#9 ufs_rmdir+0x247 sys/ufs/ufs/ufs_vnops.c:1330
#10 VOP_RMDIR+0xf8 sys/kern/vfs_vops.c:474
#11 dounlinkat+0x14c sys/kern/vfs_syscalls.c:1818
#12 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#12 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#13 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd806128f0a8)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 rw_enter+0x447 sys/kern/kern_rwlock.c:306
#2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435
#3 VOP_LOCK+0xf0 sys/kern/vfs_vops.c:615
#4 vn_lock+0x81 sys/kern/vfs_vnops.c:571
#5 vget+0x1c3 sys/kern/vfs_subr.c:672
#6 ufs_ihashget+0x141 sys/ufs/ufs/ufs_ihash.c:119
#7 ffs_vget+0x74 sys/ufs/ffs/ffs_vfsops.c:1323
#8 ufs_lookup+0x14b4 sys/ufs/ufs/ufs_lookup.c:487
#9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:91
#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:1785
#13 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#13 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#14 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd806128f1b8)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 rw_enter+0x447 sys/kern/kern_rwlock.c:306
#2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435
#3 VOP_LOCK+0xf0 sys/kern/vfs_vops.c:615
#4 vn_lock+0x81 sys/kern/vfs_vnops.c:571
#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:1785
#8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#9 Xsyscall+0x128
exclusive mutex &bq->bufq_mtx r = 0 (0xffff800000172968)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 bufq_dequeue+0x2c sys/kern/kern_bufq.c:198
#4 sdstart+0x9f sys/scsi/sd.c:681
#5 scsi_iopool_run+0x129 scsi_ioh_pending sys/scsi/scsi_base.c:394 [inline]
#5 scsi_iopool_run+0x129 sys/scsi/scsi_base.c:410
#6 scsi_xsh_runqueue+0x210 sys/scsi/scsi_base.c:586
#7 scsi_xsh_add+0xc9 sys/scsi/scsi_base.c:525
#8 sdstrategy+0x187 sys/scsi/sd.c:582
#9 spec_strategy+0x74 sys/kern/spec_vnops.c:468
#10 VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:727
#11 bwrite+0x1b9 sys/kern/vfs_bio.c:738
#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:1357
#15 VOP_RMDIR+0xf8 sys/kern/vfs_vops.c:474
#16 dounlinkat+0x14c sys/kern/vfs_syscalls.c:1818
#17 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#17 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#18 Xsyscall+0x128
Process 4209 (softnet) thread 0xffff800020a104f0 (69215)
shared rwlock netlock r = 0 (0xffffffff825124c8)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 if_input_process+0x84 sys/net/if.c:942
#2 ifiq_process+0x80 sys/net/ifq.c:607
#3 taskq_thread+0x9c sys/kern/kern_task.c:368
#4 proc_trampoline+0x1c
shared rwlock softnet r = 0 (0xffff8000000230e0)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 taskq_thread+0x8f sys/kern/kern_task.c:367
#2 proc_trampoline+0x1c
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim
devbuf 9516 7051K 8152K 78643K 13093 0 0
pcb 13 8K 8K 78643K 130 0 0
rtable 116 5K 5K 78643K 525 0 0
ifaddr 93 16K 16K 78643K 185 0 0
counters 39 33K 33K 78643K 39 0 0
ioctlops 0 0K 4K 78643K 1485 0 0
iov 0 0K 16K 78643K 73 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1236 78K 78K 78643K 1959 0 0
UFS quota 1 32K 32K 78643K 1 0 0
UFS mount 5 36K 36K 78643K 5 0 0
shm 2 1K 5K 78643K 7 0 0
VM map 8 4K 4K 78643K 10 0 0
sem 12 1K 1K 78643K 53 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1809 196K 290K 78643K 12766 0 0
file desc 4 9K 25K 78643K 469 0 0
sigio 0 0K 0K 78643K 6 0 0
proc 60 63K 95K 78643K 572 0 0
subproc 32 2K 2K 78643K 73 0 0
NFS srvsock 1 0K 0K 78643K 1 0 0
NFS daemon 1 16K 16K 78643K 1 0 0
ip_moptions 0 0K 0K 78643K 38 0 0
in_multi 70 3K 3K 78643K 104 0 0
ether_multi 1 0K 0K 78643K 4 0 0
mrt 0 0K 0K 78643K 2 0 0
ISOFS mount 1 32K 32K 78643K 1 0 0
MSDOSFS mount 1 16K 16K 78643K 1 0 0
ttys 60 265K 265K 78643K 60 0 0
exec 0 0K 1K 78643K 292 0 0
pagedep 1 8K 8K 78643K 1 0 0
inodedep 1 32K 32K 78643K 1 0 0
newblk 1 0K 0K 78643K 1 0 0
VM swap 7 26K 26K 78643K 7 0 0
UVM amap 110 39K 40K 78643K 2530 0 0
UVM aobj 51 4K 4K 78643K 53 0 0
memdesc 1 4K 4K 78643K 1 0 0
crypto data 1 1K 1K 78643K 1 0 0
ip6_options 0 0K 0K 78643K 105 0 0
NDP 12 0K 0K 78643K 39 0 0
temp 135 3551K 4191K 78643K 13766 0 0
kqueue 0 0K 0K 78643K 10 0 0
SYN cache 2 16K 16K 78643K 2 0 0
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg
Idle
arp 64 21 0 14 1 0 1 1 0
8 0
plcache 128 20 0 0 1 0 1 1 0
8 0
rtpcb 80 61 0 59 1 0 1 1 0
8 0
rtentry 112 92 0 47 2 0 2 2 0
8 0
unpcb 120 239 0 229 1 0 1 1 0
8 0
syncache 264 4 0 4 1 1 0 1 0
8 0
tcpqe 32 122 0 122 1 1 0 1 0
8 0
tcpcb 544 192 0 188 2 1 1 2 0
8 0
inpcb 280 1374 0 1367 14 6 8 8 0
8 7
nd6 48 9 0 5 1 0 1 1 0
8 0
pkpcb 40 8 0 8 1 1 0 1 0
8 0
ppxss 1128 16 0 16 3 2 1 1 0
8 1
pffrag 232 21 0 21 3 2 1 1 0
482 1
pffrnode 88 21 0 21 3 2 1 1 0
8 1
pffrent 40 505 0 505 3 2 1 1 0
8 1
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 51 0 11 1 0 1 1 0
8 0
pfstkey 112 51 0 11 2 0 2 2 0
8 0
pfstate 328 51 0 11 4 0 4 4 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 256 379 0 152 15 0 15 15 0
8 0
art_table 32 380 0 152 2 0 2 2 0
8 0
art_node 16 91 0 50 1 0 1 1 0
8 0
sysvmsgpl 40 47 0 27 1 0 1 1 0
8 0
semupl 112 2 0 2 1 1 0 1 0
8 0
semapl 112 49 0 39 1 0 1 1 0
8 0
shmpl 112 51 0 2 2 0 2 2 0
8 0
dirhash 1024 17 0 0 3 0 3 3 0
8 0
dino1pl 128 2082 0 679 46 0 46 46 0
8 0
ffsino 272 2082 0 679 96 1 95 95 0
8 0
nchpl 144 3079 0 1476 61 0 61 61 0
8 0
uvmvnodes 72 2752 0 0 51 0 51 51 0
8 0
vnodes 208 2752 0 0 145 0 145 145 0
8 0
namei 1024 9358 0 9358 1 0 1 1 0
8 1
percpumem 16 30 0 0 1 0 1 1 0
8 0
vcpupl 1984 6 0 0 1 0 1 1 0
8 0
vmpool 552 8 0 2 1 0 1 1 0
8 0
scxspl 192 8567 0 8567 7 3 4 4 0
8 4
plimitpl 152 51 0 43 1 0 1 1 0
8 0
sigapl 432 661 0 647 3 1 2 3 0
8 0
futexpl 56 14119 0 14119 1 0 1 1 0
8 1
knotepl 112 150 0 131 1 0 1 1 0
8 0
kqueuepl 104 108 0 106 1 0 1 1 0
8 0
pipepl 160 420 0 401 4 2 2 2 0
8 1
fdescpl 488 662 0 647 3 0 3 3 0
8 0
filepl 152 5788 0 5688 10 2 8 8 0
8 4
lockfpl 104 186 0 184 1 0 1 1 0
8 0
lockfspl 48 63 0 61 1 0 1 1 0
8 0
sessionpl 112 20 0 9 1 0 1 1 0
8 0
pgrppl 48 26 0 15 1 0 1 1 0
8 0
ucredpl 96 568 0 559 1 0 1 1 0
8 0
zombiepl 144 647 0 646 1 0 1 1 0
8 0
processpl 896 679 0 646 4 0 4 4 0
8 0
procpl 632 1666 0 1624 5 0 5 5 0
8 1
srpgc 64 2 0 2 1 1 0 1 0
8 0
sosppl 128 356 0 356 3 1 2 2 0
8 2
sockpl 384 1691 0 1672 19 7 12 12 0 8
10
mcl64k 65536 10 0 0 2 0 2 2 0
8 0
mcl16k 16384 3 0 0 1 0 1 1 0
8 0
mcl12k 12288 6 0 0 1 0 1 1 0
8 0
mcl9k 9216 6 0 0 1 0 1 1 0
8 0
mcl8k 8192 6 0 0 1 0 1 1 0
8 0
mcl4k 4096 12 0 0 2 0 2 2 0
8 0
mcl2k2 2112 3 0 0 1 0 1 1 0
8 0
mcl2k 2048 182 0 0 22 0 22 22 0
8 0
mtagpl 80 30 0 0 1 0 1 1 0
8 0
mbufpl 256 343 0 0 21 0 21 21 0
8 0
bufpl 256 7408 0 1309 382 0 382 382 0
8 0
anonpl 16 83782 0 65190 105 1 104 104 0 124
11
amapchunkpl 152 4007 0 3858 13 2 11 12 0
158 3
amappl16 192 3438 0 2172 75 3 72 75 0
8 8
amappl15 184 2 0 1 1 0 1 1 0
8 0
amappl14 176 60 0 56 1 0 1 1 0
8 0
amappl13 168 218 0 216 1 0 1 1 0
8 0
amappl12 160 4 0 3 2 1 1 1 0
8 0
amappl11 152 84 0 67 1 0 1 1 0
8 0
amappl10 144 19 0 12 1 0 1 1 0
8 0
amappl9 136 820 0 817 1 0 1 1 0
8 0
amappl8 128 364 0 341 1 0 1 1 0
8 0
amappl7 120 48 0 42 1 0 1 1 0
8 0
amappl6 112 73 0 63 1 0 1 1 0
8 0
amappl5 104 149 0 135 1 0 1 1 0
8 0
amappl4 96 1068 0 1034 2 1 1 2 0
8 0
amappl3 88 134 0 129 1 0 1 1 0
8 0
amappl2 80 4254 0 4189 3 1 2 3 0
8 0
amappl1 72 23949 0 23527 26 16 10 20 0
8 0
amappl 80 1950 0 1905 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 52 0 2 1 0 1 1 0
8 0
uaddrrnd 24 670 0 647 1 0 1 1 0
8 0
uaddrbest 32 2 0 0 1 0 1 1 0
8 0
uaddr 24 670 0 647 1 0 1 1 0
8 0
vmmpekpl 168 9442 0 9404 2 0 2 2 0
8 0
vmmpepl 168 90046 0 87703 179 23 156 156 0 357
43
vmsppl 368 661 0 647 2 0 2 2 0
8 0
pdppl 4096 1347 0 1304 6 0 6 6 0
8 0
pvpl 32 257530 0 236284 244 4 240 240 0 265
34
pmappl 232 669 0 649 3 1 2 2 0
8 0
extentpl 40 46 0 29 1 0 1 1 0
8 0
phpool 112 561 0 5 16 0 16 16 0
8 0
---
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.
Anton Lindqvist
Nov 15, 2019, 5:55:42 AM11/15/19
to syzbot, syzkaller-o...@googlegroups.com
#syz dup: pool: cpu free list modified: mbufpl
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