witness: reversal: &pr->ps_mtx &sched_lock
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syzbot
May 31, 2019, 8:10:06 PM5/31/19
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: 337db085 Fix warnings, from Ben Boeckel.
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=1745d372a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=7f659e47e42d9641
dashboard link: https://syzkaller.appspot.com/bug?extid=8e4863b3dde88eb706dc
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+8e4863...@syzkaller.appspotmail.com
witness: lock order reversal:
1st 0xffff800020b3ab38 &pr->ps_mtx (&pr->ps_mtx)
2nd 0xffffffff8236e2f8 &sched_lock (&sched_lock)
lock order "&sched_lock"(sched_lock) -> "&pr->ps_mtx"(mutex) first seen at:
#0 witness_checkorder+0x6a7 sys/kern/subr_witness.c:877
#1 mtx_enter+0x3a sys/kern/kern_lock.c:265
#2 tuagg+0x32 sys/kern/kern_resource.c:360
#3 mi_switch+0x1c7 x86_atomic_clearbits_u32
sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:298 [inline]
#3 mi_switch+0x1c7 sys/kern/sched_bsd.c:392
#4 sleep_finish+0x110 sys/kern/kern_synch.c:303
#5 msleep+0x1af sleep_finish_timeout sys/kern/kern_synch.c:327 [inline]
#5 msleep+0x1af sleep_finish_all sys/kern/kern_synch.c:157 [inline]
#5 msleep+0x1af sys/kern/kern_synch.c:220
#6 scsi_xs_sync+0x14f sys/scsi/scsi_base.c:1339
#7 scsi_start+0x86 sys/scsi/scsi_base.c:938
#8 sdopen+0x22b sys/scsi/sd.c:400
#9 spec_open+0x41c sys/kern/spec_vnops.c:158
#10 VOP_OPEN+0x6a sys/kern/vfs_vops.c:153
#11 sr_meta_native_bootprobe+0xd3 sys/dev/softraid.c:1038
#12 sr_boot_assembly+0x1aa sys/dev/softraid.c:1202
#13 sr_attach+0x183 sys/dev/softraid.c:1822
#14 config_attach+0x347 sys/kern/subr_autoconf.c:404
#15 main+0x6de sys/kern/init_main.c:483
#16 longmode_hi+0x95
lock order "&pr->ps_mtx"(mutex) -> "&sched_lock"(sched_lock) first seen at:
#0 witness_checkorder+0x6a7 sys/kern/subr_witness.c:877
#1 __mp_lock+0xa1
#2 schedclock+0x99 sys/kern/sched_bsd.c:547
#3 hardclock+0x1d8 sys/kern/kern_clock.c:174
#4 lapic_clockintr+0x44 sys/arch/amd64/amd64/lapic.c:425
#5 Xresume_lapic_ltimer+0x26
#6 witness_unlock+0xb sys/kern/subr_witness.c:1252
#7 exit1+0x6e5 sys/kern/kern_exit.c:292
#8 sys_exit+0x17 sys/kern/kern_exit.c:94
#9 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline]
#9 syscall+0x552 sys/arch/amd64/amd64/trap.c:574
#10 Xsyscall+0x128
Stopped at db_enter+0x18: addq $0x8,%rsp
ddb{0}>
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
the kernel did not panic
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
witness_checkorder(ffffffff8236e2f8,9,0) at witness_checkorder+0xffc
witness_debugger sys/kern/subr_witness.c:2504 [inline]
witness_checkorder(ffffffff8236e2f8,9,0) at witness_checkorder+0xffc
sys/kern/subr_witness.c:1084
__mp_lock(ffffffff8236e0f0) at __mp_lock+0xa1
schedclock(ffff800020b39080) at schedclock+0x99 sys/kern/sched_bsd.c:547
hardclock(ffff800020bebc50) at hardclock+0x1d8 sys/kern/kern_clock.c:174
lapic_clockintr(0,0) at lapic_clockintr+0x44
sys/arch/amd64/amd64/lapic.c:425
Xresume_lapic_ltimer(9,ffffffff819d2606,ffffffff821abff0,0,0,ffff800020b3ab28)
at
Xresume_lapic_ltimer+0x26
witness_unlock(ffff800020b3ab28,ffff800020b3ab28) at witness_unlock+0xb
sys/kern/subr_witness.c:1252
exit1(ffff800020b39080,0,1) at exit1+0x6e5 sys/kern/kern_exit.c:292
sys_exit(ffff800020b39080,ffff800020bebe20,ffff800020bebe90) at
sys_exit+0x17 sys/kern/kern_exit.c:94
syscall(ffff800020bebf00) at syscall+0x552 mi_syscall
sys/sys/syscall_mi.h:99 [inline]
syscall(ffff800020bebf00) at syscall+0x552 sys/arch/amd64/amd64/trap.c:574
Xsyscall(6,1,0,1,0,7f7ffffc1c04) at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffc1bd0, count: -12
ddb{0}> show registers
rdi 0x3
rsi 0xffffffff82243e20 __sancov_gen_cov_switch_values.122
rbp 0xffff800020beba50
rbx 0x3
rdx 0xffffffff821abff0 cpu_info_full_primary+0x1ff0
rcx 0x3
rax 0xffffffff821abff0 cpu_info_full_primary+0x1ff0
r8 0xffffffff81da2df5 witness_checkorder+0xfd5
r9 0x5
r10 0x3
r11 0xf852b1e86fa5e5e4
r12 0xfffffd8002661340
r13 0xc
r14 0xffffffff8233b1a0 w_lodata+0x4c2f0
r15 0xffffffff82346250 w_lodata+0x573a0
rip 0xffffffff819ca3d8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800020beba40
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor.1) pid=446410 stat=dead
flags process=1018<EXITING,SUGID,SINGLEEXIT> proc=2000<WEXIT>
pri=50, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffffffffffffffff,0xffffffffffffffff
process=0xffff800020b3aa78 user=0xffff800020be6000,
vmspace=0xfffffd807effd708
estcpu=36, cpticks=2, pctcpu=0.0
user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
87293 420919 0 0 3 0x14200 bored sosplice
90431 106044 68909 32767 2 0x10 syz-executor.0
68909 431296 52731 0 3 0x82 wait syz-executor.0
32584 282746 42077 32767 3 0x90 nanosleep syz-executor.1
42077 63674 52731 0 3 0x82 wait syz-executor.1
52731 178504 66216 0 3 0x82 thrsleep syz-fuzzer
52731 410607 66216 0 3 0x4000082 nanosleep syz-fuzzer
52731 270885 66216 0 3 0x4000082 thrsleep syz-fuzzer
52731 322073 66216 0 3 0x4000082 thrsleep syz-fuzzer
52731 140142 66216 0 3 0x4000082 kqread syz-fuzzer
52731 114256 66216 0 3 0x4000082 thrsleep syz-fuzzer
52731 387658 66216 0 3 0x4000082 thrsleep syz-fuzzer
52731 55402 66216 0 3 0x4000082 thrsleep syz-fuzzer
52731 520403 66216 0 3 0x4000082 thrsleep syz-fuzzer
52731 465176 66216 0 3 0x4000082 thrsleep syz-fuzzer
66216 247987 75556 0 3 0x10008a pause ksh
75556 282141 24810 0 3 0x92 select sshd
89601 65271 1 0 3 0x100083 ttyin getty
24810 350318 1 0 3 0x80 select sshd
44755 468487 35631 73 2 0x100090 syslogd
35631 483454 1 0 3 0x100082 netio syslogd
11652 470873 1 77 3 0x100090 poll dhclient
80885 512852 1 0 3 0x80 poll dhclient
32288 522203 0 0 3 0x14200 pgzero zerothread
13936 8971 0 0 3 0x14200 aiodoned aiodoned
73632 15854 0 0 3 0x14200 syncer update
42737 111333 0 0 3 0x14200 cleaner cleaner
5005 475141 0 0 7 0x14200 reaper
91404 340650 0 0 3 0x14200 pgdaemon pagedaemon
70774 74275 0 0 3 0x14200 bored crynlk
32187 156782 0 0 3 0x14200 bored crypto
63184 392752 0 0 3 0x40014200 acpi0 acpi0
62108 386286 0 0 3 0x40014200 idle1
39074 382011 0 0 3 0x14200 bored softnet
15741 408631 0 0 3 0x14200 bored systqmp
37563 172731 0 0 3 0x14200 bored systq
94612 34492 0 0 3 0x40014200 bored softclock
33024 378939 0 0 3 0x40014200 idle0
40072 117423 0 0 3 0x14200 bored smr
1 337267 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &pr->ps_mtx r = 0 (0xffff800020b3ab38)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1161
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 tuagg+0x32 sys/kern/kern_resource.c:360
#4 exit1+0x6e5 sys/kern/kern_exit.c:292
#5 sys_exit+0x17 sys/kern/kern_exit.c:94
#6 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline]
#6 syscall+0x552 sys/arch/amd64/amd64/trap.c:574
#7 Xsyscall+0x128
Process 90431 (syz-executor.0) thread 0xffff800020b38e28 (106044)
exclusive rrwlock inode r = 0 (0xfffffd8069338d60)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1161
#1 rw_enter+0x46d sys/kern/kern_rwlock.c:306
#2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435
#3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602
#4 vn_lock+0x6e sys/kern/vfs_vnops.c:549
#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+0x1575 sys/ufs/ufs/ufs_lookup.c:487
#9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:90
#10 vfs_lookup+0x77d sys/kern/vfs_lookup.c:571
#11 namei+0x61c sys/kern/vfs_lookup.c:252
#12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1766
#13 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline]
#13 syscall+0x552 sys/arch/amd64/amd64/trap.c:574
#14 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd80693382c0)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1161
#1 rw_enter+0x46d sys/kern/kern_rwlock.c:306
#2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435
#3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602
#4 vn_lock+0x6e sys/kern/vfs_vnops.c:549
#5 vfs_lookup+0xe9 sys/kern/vfs_lookup.c:422
#6 namei+0x61c sys/kern/vfs_lookup.c:252
#7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1766
#8 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline]
#8 syscall+0x552 sys/arch/amd64/amd64/trap.c:574
#9 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim
devbuf 9458 6321K 6321K 78643K 10550 0 0
pcb 23 9K 9K 78643K 83 0 0
rtable 105 3K 3K 78643K 235 0 0
ifaddr 34 9K 9K 78643K 40 0 0
counters 39 33K 33K 78643K 39 0 0
ioctlops 0 0K 2K 78643K 18 0 0
iov 0 0K 12K 78643K 90 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1209 76K 76K 78643K 1240 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 4 0 0
VM map 2 1K 1K 78643K 2 0 0
sem 10 0K 1K 78643K 101 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1808 196K 290K 78643K 12628 0 0
file desc 6 17K 33K 78643K 311 0 0
sigio 0 0K 0K 78643K 2 0 0
proc 41 38K 70K 78643K 339 0 0
subproc 34 2K 2K 78643K 51 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 10 0 0
in_multi 33 2K 2K 78643K 46 0 0
ether_multi 1 0K 0K 78643K 1 0 0
ISOFS mount 1 32K 32K 78643K 1 0 0
MSDOSFS mount 1 16K 16K 78643K 1 0 0
ttys 48 212K 212K 78643K 48 0 0
exec 0 0K 1K 78643K 196 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 84 20K 30K 78643K 1681 0 0
UVM aobj 2 2K 2K 78643K 2 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 1 0 0
NDP 5 0K 0K 78643K 12 0 0
temp 83 2724K 2788K 78643K 3693 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 8 0 2 1 0 1 1 0
8 0
inpcbpl 280 93 0 86 1 0 1 1 0
8 0
plimitpl 152 23 0 14 1 0 1 1 0
8 0
plcache 128 20 0 0 1 0 1 1 0
8 0
rtentry 112 56 0 12 2 0 2 2 0
8 0
syncache 264 4 0 4 1 1 0 1 0
8 0
tcpcb 544 26 0 22 1 0 1 1 0
8 0
nd6 48 9 0 3 1 0 1 1 0
8 0
art_heap8 4096 1 0 0 1 0 1 1 0
8 0
art_heap4 256 232 0 44 12 0 12 12 0
8 0
art_table 32 233 0 44 2 0 2 2 0
8 0
art_node 16 55 0 15 1 0 1 1 0
8 0
semupl 112 37 0 37 1 0 1 1 0
8 1
semapl 112 99 0 91 1 0 1 1 0
8 0
dirhash 1024 17 0 0 3 0 3 3 0
8 0
dino1pl 128 1799 0 380 46 0 46 46 0
8 0
ffsino 272 1799 0 380 95 0 95 95 0
8 0
nchpl 144 2408 0 791 61 0 61 61 0
8 0
uvmvnodes 72 1859 0 0 34 0 34 34 0
8 0
vnodes 200 1859 0 0 98 0 98 98 0
8 0
namei 1024 6128 0 6128 2 1 1 1 0
8 1
percpumem 16 30 0 0 1 0 1 1 0
8 0
scxspl 192 7049 0 7049 9 8 1 6 0
8 1
sigapl 432 479 0 464 3 1 2 3 0
8 0
futexpl 56 2216 0 2216 1 0 1 1 0
8 1
knotepl 112 79 0 60 1 0 1 1 0
8 0
kqueuepl 104 20 0 18 1 0 1 1 0
8 0
pipepl 112 370 0 351 2 1 1 1 0
8 0
fdescpl 488 480 0 465 3 0 3 3 0
8 1
filepl 152 2223 0 2127 6 1 5 5 0
8 1
lockfpl 104 245 0 245 2 1 1 1 0
8 1
lockfspl 48 119 0 119 2 1 1 1 0
8 1
sessionpl 112 18 0 8 1 0 1 1 0
8 0
pgrppl 48 18 0 8 1 0 1 1 0
8 0
ucredpl 96 445 0 436 1 0 1 1 0
8 0
zombiepl 144 465 0 464 2 1 1 1 0
8 0
processpl 888 496 0 464 4 0 4 4 0
8 0
procpl 600 887 0 845 4 0 4 4 0
8 0
srpgc 64 6 0 6 1 1 0 1 0
8 0
sosppl 128 3 0 3 1 0 1 1 0
8 1
sockpl 384 165 0 148 3 0 3 3 0
8 1
mcl12k 12288 1 0 0 1 0 1 1 0
8 0
mcl9k 9216 1 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 2 0 0 1 0 1 1 0
8 0
mcl2k 2048 122 0 0 15 0 15 15 0
8 0
mtagpl 80 1 0 0 1 0 1 1 0
8 0
mbufpl 256 181 0 0 11 0 11 11 0
8 0
bufpl 256 5935 0 1159 299 0 299 299 0
8 0
anonpl 16 43797 0 38178 29 5 24 28 0
125 0
amapchunkpl 152 2410 0 2323 11 5 6 11 0
158 2
amappl16 192 1243 0 959 17 2 15 17 0
8 0
amappl15 184 248 0 244 1 0 1 1 0
8 0
amappl14 176 153 0 150 2 1 1 1 0
8 0
amappl12 160 34 0 33 1 0 1 1 0
8 0
amappl11 152 54 0 40 1 0 1 1 0
8 0
amappl10 144 72 0 69 2 1 1 1 0
8 0
amappl9 136 570 0 567 1 0 1 1 0
8 0
amappl8 128 134 0 120 1 0 1 1 0
8 0
amappl7 120 42 0 33 1 0 1 1 0
8 0
amappl6 112 60 0 52 1 0 1 1 0
8 0
amappl5 104 138 0 129 1 0 1 1 0
8 0
amappl4 96 487 0 467 1 0 1 1 0
8 0
amappl3 88 428 0 411 1 0 1 1 0
8 0
amappl2 80 3083 0 3014 4 2 2 3 0
8 0
amappl1 72 19520 0 19083 23 13 10 19 0
8 0
amappl 80 1131 0 1096 1 0 1 1 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
dma64 64 259 0 259 1 1 0 1 0
8 0
dma32 32 7 0 7 1 1 0 1 0
8 0
dma16 16 17 0 17 1 1 0 1 0
8 0
aobjpl 64 1 0 0 1 0 1 1 0
8 0
uaddrrnd 24 480 0 464 1 0 1 1 0
8 0
uaddrbest 32 2 0 0 1 0 1 1 0
8 0
uaddr 24 480 0 464 1 0 1 1 0
8 0
vmmpekpl 168 7613 0 7589 2 0 2 2 0
8 0
vmmpepl 168 58558 0 57204 90 25 65 74 0
357 6
vmsppl 360 479 0 464 2 0 2 2 0
8 0
pdppl 4096 968 0 928 6 0 6 6 0
8 1
pvpl 32 208620 0 199846 104 15 89 102 0 265
15
pmappl 232 479 0 464 2 1 1 2 0
8 0
extentpl 40 41 0 26 1 0 1 1 0
8 0
phpool 112 449 0 3 13 0 13 13 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: 337db085 Fix warnings, from Ben Boeckel.
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=1745d372a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=7f659e47e42d9641
dashboard link: https://syzkaller.appspot.com/bug?extid=8e4863b3dde88eb706dc
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+8e4863...@syzkaller.appspotmail.com
witness: lock order reversal:
1st 0xffff800020b3ab38 &pr->ps_mtx (&pr->ps_mtx)
2nd 0xffffffff8236e2f8 &sched_lock (&sched_lock)
lock order "&sched_lock"(sched_lock) -> "&pr->ps_mtx"(mutex) first seen at:
#0 witness_checkorder+0x6a7 sys/kern/subr_witness.c:877
#1 mtx_enter+0x3a sys/kern/kern_lock.c:265
#2 tuagg+0x32 sys/kern/kern_resource.c:360
#3 mi_switch+0x1c7 x86_atomic_clearbits_u32
sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:298 [inline]
#3 mi_switch+0x1c7 sys/kern/sched_bsd.c:392
#4 sleep_finish+0x110 sys/kern/kern_synch.c:303
#5 msleep+0x1af sleep_finish_timeout sys/kern/kern_synch.c:327 [inline]
#5 msleep+0x1af sleep_finish_all sys/kern/kern_synch.c:157 [inline]
#5 msleep+0x1af sys/kern/kern_synch.c:220
#6 scsi_xs_sync+0x14f sys/scsi/scsi_base.c:1339
#7 scsi_start+0x86 sys/scsi/scsi_base.c:938
#8 sdopen+0x22b sys/scsi/sd.c:400
#9 spec_open+0x41c sys/kern/spec_vnops.c:158
#10 VOP_OPEN+0x6a sys/kern/vfs_vops.c:153
#11 sr_meta_native_bootprobe+0xd3 sys/dev/softraid.c:1038
#12 sr_boot_assembly+0x1aa sys/dev/softraid.c:1202
#13 sr_attach+0x183 sys/dev/softraid.c:1822
#14 config_attach+0x347 sys/kern/subr_autoconf.c:404
#15 main+0x6de sys/kern/init_main.c:483
#16 longmode_hi+0x95
lock order "&pr->ps_mtx"(mutex) -> "&sched_lock"(sched_lock) first seen at:
#0 witness_checkorder+0x6a7 sys/kern/subr_witness.c:877
#1 __mp_lock+0xa1
#2 schedclock+0x99 sys/kern/sched_bsd.c:547
#3 hardclock+0x1d8 sys/kern/kern_clock.c:174
#4 lapic_clockintr+0x44 sys/arch/amd64/amd64/lapic.c:425
#5 Xresume_lapic_ltimer+0x26
#6 witness_unlock+0xb sys/kern/subr_witness.c:1252
#7 exit1+0x6e5 sys/kern/kern_exit.c:292
#8 sys_exit+0x17 sys/kern/kern_exit.c:94
#9 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline]
#9 syscall+0x552 sys/arch/amd64/amd64/trap.c:574
#10 Xsyscall+0x128
Stopped at db_enter+0x18: addq $0x8,%rsp
ddb{0}>
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
the kernel did not panic
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
witness_checkorder(ffffffff8236e2f8,9,0) at witness_checkorder+0xffc
witness_debugger sys/kern/subr_witness.c:2504 [inline]
witness_checkorder(ffffffff8236e2f8,9,0) at witness_checkorder+0xffc
sys/kern/subr_witness.c:1084
__mp_lock(ffffffff8236e0f0) at __mp_lock+0xa1
schedclock(ffff800020b39080) at schedclock+0x99 sys/kern/sched_bsd.c:547
hardclock(ffff800020bebc50) at hardclock+0x1d8 sys/kern/kern_clock.c:174
lapic_clockintr(0,0) at lapic_clockintr+0x44
sys/arch/amd64/amd64/lapic.c:425
Xresume_lapic_ltimer(9,ffffffff819d2606,ffffffff821abff0,0,0,ffff800020b3ab28)
at
Xresume_lapic_ltimer+0x26
witness_unlock(ffff800020b3ab28,ffff800020b3ab28) at witness_unlock+0xb
sys/kern/subr_witness.c:1252
exit1(ffff800020b39080,0,1) at exit1+0x6e5 sys/kern/kern_exit.c:292
sys_exit(ffff800020b39080,ffff800020bebe20,ffff800020bebe90) at
sys_exit+0x17 sys/kern/kern_exit.c:94
syscall(ffff800020bebf00) at syscall+0x552 mi_syscall
sys/sys/syscall_mi.h:99 [inline]
syscall(ffff800020bebf00) at syscall+0x552 sys/arch/amd64/amd64/trap.c:574
Xsyscall(6,1,0,1,0,7f7ffffc1c04) at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffc1bd0, count: -12
ddb{0}> show registers
rdi 0x3
rsi 0xffffffff82243e20 __sancov_gen_cov_switch_values.122
rbp 0xffff800020beba50
rbx 0x3
rdx 0xffffffff821abff0 cpu_info_full_primary+0x1ff0
rcx 0x3
rax 0xffffffff821abff0 cpu_info_full_primary+0x1ff0
r8 0xffffffff81da2df5 witness_checkorder+0xfd5
r9 0x5
r10 0x3
r11 0xf852b1e86fa5e5e4
r12 0xfffffd8002661340
r13 0xc
r14 0xffffffff8233b1a0 w_lodata+0x4c2f0
r15 0xffffffff82346250 w_lodata+0x573a0
rip 0xffffffff819ca3d8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800020beba40
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor.1) pid=446410 stat=dead
flags process=1018<EXITING,SUGID,SINGLEEXIT> proc=2000<WEXIT>
pri=50, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffffffffffffffff,0xffffffffffffffff
process=0xffff800020b3aa78 user=0xffff800020be6000,
vmspace=0xfffffd807effd708
estcpu=36, cpticks=2, pctcpu=0.0
user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
87293 420919 0 0 3 0x14200 bored sosplice
90431 106044 68909 32767 2 0x10 syz-executor.0
68909 431296 52731 0 3 0x82 wait syz-executor.0
32584 282746 42077 32767 3 0x90 nanosleep syz-executor.1
42077 63674 52731 0 3 0x82 wait syz-executor.1
52731 178504 66216 0 3 0x82 thrsleep syz-fuzzer
52731 410607 66216 0 3 0x4000082 nanosleep syz-fuzzer
52731 270885 66216 0 3 0x4000082 thrsleep syz-fuzzer
52731 322073 66216 0 3 0x4000082 thrsleep syz-fuzzer
52731 140142 66216 0 3 0x4000082 kqread syz-fuzzer
52731 114256 66216 0 3 0x4000082 thrsleep syz-fuzzer
52731 387658 66216 0 3 0x4000082 thrsleep syz-fuzzer
52731 55402 66216 0 3 0x4000082 thrsleep syz-fuzzer
52731 520403 66216 0 3 0x4000082 thrsleep syz-fuzzer
52731 465176 66216 0 3 0x4000082 thrsleep syz-fuzzer
66216 247987 75556 0 3 0x10008a pause ksh
75556 282141 24810 0 3 0x92 select sshd
89601 65271 1 0 3 0x100083 ttyin getty
24810 350318 1 0 3 0x80 select sshd
44755 468487 35631 73 2 0x100090 syslogd
35631 483454 1 0 3 0x100082 netio syslogd
11652 470873 1 77 3 0x100090 poll dhclient
80885 512852 1 0 3 0x80 poll dhclient
32288 522203 0 0 3 0x14200 pgzero zerothread
13936 8971 0 0 3 0x14200 aiodoned aiodoned
73632 15854 0 0 3 0x14200 syncer update
42737 111333 0 0 3 0x14200 cleaner cleaner
5005 475141 0 0 7 0x14200 reaper
91404 340650 0 0 3 0x14200 pgdaemon pagedaemon
70774 74275 0 0 3 0x14200 bored crynlk
32187 156782 0 0 3 0x14200 bored crypto
63184 392752 0 0 3 0x40014200 acpi0 acpi0
62108 386286 0 0 3 0x40014200 idle1
39074 382011 0 0 3 0x14200 bored softnet
15741 408631 0 0 3 0x14200 bored systqmp
37563 172731 0 0 3 0x14200 bored systq
94612 34492 0 0 3 0x40014200 bored softclock
33024 378939 0 0 3 0x40014200 idle0
40072 117423 0 0 3 0x14200 bored smr
1 337267 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &pr->ps_mtx r = 0 (0xffff800020b3ab38)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1161
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 tuagg+0x32 sys/kern/kern_resource.c:360
#4 exit1+0x6e5 sys/kern/kern_exit.c:292
#5 sys_exit+0x17 sys/kern/kern_exit.c:94
#6 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline]
#6 syscall+0x552 sys/arch/amd64/amd64/trap.c:574
#7 Xsyscall+0x128
Process 90431 (syz-executor.0) thread 0xffff800020b38e28 (106044)
exclusive rrwlock inode r = 0 (0xfffffd8069338d60)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1161
#1 rw_enter+0x46d sys/kern/kern_rwlock.c:306
#2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435
#3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602
#4 vn_lock+0x6e sys/kern/vfs_vnops.c:549
#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+0x1575 sys/ufs/ufs/ufs_lookup.c:487
#9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:90
#10 vfs_lookup+0x77d sys/kern/vfs_lookup.c:571
#11 namei+0x61c sys/kern/vfs_lookup.c:252
#12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1766
#13 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline]
#13 syscall+0x552 sys/arch/amd64/amd64/trap.c:574
#14 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd80693382c0)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1161
#1 rw_enter+0x46d sys/kern/kern_rwlock.c:306
#2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435
#3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602
#4 vn_lock+0x6e sys/kern/vfs_vnops.c:549
#5 vfs_lookup+0xe9 sys/kern/vfs_lookup.c:422
#6 namei+0x61c sys/kern/vfs_lookup.c:252
#7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1766
#8 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline]
#8 syscall+0x552 sys/arch/amd64/amd64/trap.c:574
#9 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim
devbuf 9458 6321K 6321K 78643K 10550 0 0
pcb 23 9K 9K 78643K 83 0 0
rtable 105 3K 3K 78643K 235 0 0
ifaddr 34 9K 9K 78643K 40 0 0
counters 39 33K 33K 78643K 39 0 0
ioctlops 0 0K 2K 78643K 18 0 0
iov 0 0K 12K 78643K 90 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1209 76K 76K 78643K 1240 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 4 0 0
VM map 2 1K 1K 78643K 2 0 0
sem 10 0K 1K 78643K 101 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1808 196K 290K 78643K 12628 0 0
file desc 6 17K 33K 78643K 311 0 0
sigio 0 0K 0K 78643K 2 0 0
proc 41 38K 70K 78643K 339 0 0
subproc 34 2K 2K 78643K 51 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 10 0 0
in_multi 33 2K 2K 78643K 46 0 0
ether_multi 1 0K 0K 78643K 1 0 0
ISOFS mount 1 32K 32K 78643K 1 0 0
MSDOSFS mount 1 16K 16K 78643K 1 0 0
ttys 48 212K 212K 78643K 48 0 0
exec 0 0K 1K 78643K 196 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 84 20K 30K 78643K 1681 0 0
UVM aobj 2 2K 2K 78643K 2 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 1 0 0
NDP 5 0K 0K 78643K 12 0 0
temp 83 2724K 2788K 78643K 3693 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 8 0 2 1 0 1 1 0
8 0
inpcbpl 280 93 0 86 1 0 1 1 0
8 0
plimitpl 152 23 0 14 1 0 1 1 0
8 0
plcache 128 20 0 0 1 0 1 1 0
8 0
rtentry 112 56 0 12 2 0 2 2 0
8 0
syncache 264 4 0 4 1 1 0 1 0
8 0
tcpcb 544 26 0 22 1 0 1 1 0
8 0
nd6 48 9 0 3 1 0 1 1 0
8 0
art_heap8 4096 1 0 0 1 0 1 1 0
8 0
art_heap4 256 232 0 44 12 0 12 12 0
8 0
art_table 32 233 0 44 2 0 2 2 0
8 0
art_node 16 55 0 15 1 0 1 1 0
8 0
semupl 112 37 0 37 1 0 1 1 0
8 1
semapl 112 99 0 91 1 0 1 1 0
8 0
dirhash 1024 17 0 0 3 0 3 3 0
8 0
dino1pl 128 1799 0 380 46 0 46 46 0
8 0
ffsino 272 1799 0 380 95 0 95 95 0
8 0
nchpl 144 2408 0 791 61 0 61 61 0
8 0
uvmvnodes 72 1859 0 0 34 0 34 34 0
8 0
vnodes 200 1859 0 0 98 0 98 98 0
8 0
namei 1024 6128 0 6128 2 1 1 1 0
8 1
percpumem 16 30 0 0 1 0 1 1 0
8 0
scxspl 192 7049 0 7049 9 8 1 6 0
8 1
sigapl 432 479 0 464 3 1 2 3 0
8 0
futexpl 56 2216 0 2216 1 0 1 1 0
8 1
knotepl 112 79 0 60 1 0 1 1 0
8 0
kqueuepl 104 20 0 18 1 0 1 1 0
8 0
pipepl 112 370 0 351 2 1 1 1 0
8 0
fdescpl 488 480 0 465 3 0 3 3 0
8 1
filepl 152 2223 0 2127 6 1 5 5 0
8 1
lockfpl 104 245 0 245 2 1 1 1 0
8 1
lockfspl 48 119 0 119 2 1 1 1 0
8 1
sessionpl 112 18 0 8 1 0 1 1 0
8 0
pgrppl 48 18 0 8 1 0 1 1 0
8 0
ucredpl 96 445 0 436 1 0 1 1 0
8 0
zombiepl 144 465 0 464 2 1 1 1 0
8 0
processpl 888 496 0 464 4 0 4 4 0
8 0
procpl 600 887 0 845 4 0 4 4 0
8 0
srpgc 64 6 0 6 1 1 0 1 0
8 0
sosppl 128 3 0 3 1 0 1 1 0
8 1
sockpl 384 165 0 148 3 0 3 3 0
8 1
mcl12k 12288 1 0 0 1 0 1 1 0
8 0
mcl9k 9216 1 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 2 0 0 1 0 1 1 0
8 0
mcl2k 2048 122 0 0 15 0 15 15 0
8 0
mtagpl 80 1 0 0 1 0 1 1 0
8 0
mbufpl 256 181 0 0 11 0 11 11 0
8 0
bufpl 256 5935 0 1159 299 0 299 299 0
8 0
anonpl 16 43797 0 38178 29 5 24 28 0
125 0
amapchunkpl 152 2410 0 2323 11 5 6 11 0
158 2
amappl16 192 1243 0 959 17 2 15 17 0
8 0
amappl15 184 248 0 244 1 0 1 1 0
8 0
amappl14 176 153 0 150 2 1 1 1 0
8 0
amappl12 160 34 0 33 1 0 1 1 0
8 0
amappl11 152 54 0 40 1 0 1 1 0
8 0
amappl10 144 72 0 69 2 1 1 1 0
8 0
amappl9 136 570 0 567 1 0 1 1 0
8 0
amappl8 128 134 0 120 1 0 1 1 0
8 0
amappl7 120 42 0 33 1 0 1 1 0
8 0
amappl6 112 60 0 52 1 0 1 1 0
8 0
amappl5 104 138 0 129 1 0 1 1 0
8 0
amappl4 96 487 0 467 1 0 1 1 0
8 0
amappl3 88 428 0 411 1 0 1 1 0
8 0
amappl2 80 3083 0 3014 4 2 2 3 0
8 0
amappl1 72 19520 0 19083 23 13 10 19 0
8 0
amappl 80 1131 0 1096 1 0 1 1 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
dma64 64 259 0 259 1 1 0 1 0
8 0
dma32 32 7 0 7 1 1 0 1 0
8 0
dma16 16 17 0 17 1 1 0 1 0
8 0
aobjpl 64 1 0 0 1 0 1 1 0
8 0
uaddrrnd 24 480 0 464 1 0 1 1 0
8 0
uaddrbest 32 2 0 0 1 0 1 1 0
8 0
uaddr 24 480 0 464 1 0 1 1 0
8 0
vmmpekpl 168 7613 0 7589 2 0 2 2 0
8 0
vmmpepl 168 58558 0 57204 90 25 65 74 0
357 6
vmsppl 360 479 0 464 2 0 2 2 0
8 0
pdppl 4096 968 0 928 6 0 6 6 0
8 1
pvpl 32 208620 0 199846 104 15 89 102 0 265
15
pmappl 232 479 0 464 2 1 1 2 0
8 0
extentpl 40 41 0 26 1 0 1 1 0
8 0
phpool 112 449 0 3 13 0 13 13 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
May 31, 2019, 11:57:05 PM5/31/19
to syzkaller-o...@googlegroups.com
syzbot has found a reproducer for the following crash on:
HEAD commit: 337db085 Fix warnings, from Ben Boeckel.
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=1766d1a2a00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=177b5bcea00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+8e4863...@syzkaller.appspotmail.com
login: witness: lock order reversal:
1st 0xffff800020afb598 &pr->ps_mtx (&pr->ps_mtx)
2nd 0xffffffff82384c80 &sched_lock (&sched_lock)
#6 __sanitizer_cov_trace_pc+0x3f sys/dev/kcov.c:111
#7 mtx_leave+0x97 sys/kern/kern_lock.c:360
#8 sched_exit+0x112 sys/kern/kern_sched.c:225
#9 exit1+0x8bf sys/kern/kern_exit.c:349
#10 sys_exit+0x17 sys/kern/kern_exit.c:94
#11 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline]
#11 syscall+0x552 sys/arch/amd64/amd64/trap.c:574
#12 Xsyscall+0x128
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
witness_debugger sys/kern/subr_witness.c:2504 [inline]
witness_checkorder(ffffffff82384c80,9,0) at witness_checkorder+0xffc
sys/kern/subr_witness.c:1084
__mp_lock(ffffffff82384a78) at __mp_lock+0xa1
schedclock(ffff800020b84bc8) at schedclock+0x99 sys/kern/sched_bsd.c:547
hardclock(ffff800020bc3b70) at hardclock+0x1d8 sys/kern/kern_clock.c:174
Xresume_lapic_ltimer+0x26
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x3f
sys/dev/kcov.c:111
mtx_leave(ffff800020afb588) at mtx_leave+0x97 sys/kern/kern_lock.c:360
sched_exit(ffff800020b84bc8) at sched_exit+0x112 sys/kern/kern_sched.c:225
exit1(ffff800020b84bc8,0,1) at exit1+0x8bf sys/kern/kern_exit.c:349
sys_exit(ffff800020b84bc8,ffff800020bc3e40,ffff800020bc3eb0) at
sys_exit+0x17 sys/kern/kern_exit.c:94
syscall(ffff800020bc3f20) at syscall+0x552 mi_syscall
sys/sys/syscall_mi.h:99 [inline]
syscall(ffff800020bc3f20) at syscall+0x552 sys/arch/amd64/amd64/trap.c:574
Xsyscall(6,1,b37,1,431bde82d7b634db,0) at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffc1e30, count: -14
ddb{1}> show registers
rdi 0x3
rsi 0xffffffff821fc9e0 __sancov_gen_cov_switch_values.122
rbp 0xffff800020bc3970
rbx 0x3
rdx 0x8b
rcx 0x3
rax 0x3
r8 0xffffffff818c8c95 witness_checkorder+0xfd5
r9 0x5
r10 0x876747a7c1d9b7
r11 0xf2b5b9c07cb905cc
r12 0xfffffd8002661340
r13 0xc
r14 0xffffffff82338720 w_lodata+0x4d4d0
r15 0xffffffff82342280 w_lodata+0x57030
rip 0xffffffff81a42468 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800020bc3960
PROC (syz-executor9206) pid=9778 stat=dead
flags process=1008<EXITING,SINGLEEXIT> proc=2000<WEXIT>
pri=50, usrpri=64, nice=20
forw=0xffffffffffffffff, list=0xffffffffffffffff,0xffffffffffffffff
process=0xffff800020afb4d8 user=0xffff800020bbe000,
vmspace=0xfffffd806e7c7170
31685 150067 81105 0 3 0x10008a pause ksh
81105 390242 5389 0 3 0x92 select sshd
33145 418147 1 0 3 0x100083 ttyin getty
5389 116262 1 0 3 0x80 select sshd
28812 268777 95944 74 3 0x100092 bpf pflogd
95944 479827 1 0 3 0x80 netio pflogd
96392 280797 22516 73 7 0x100090 syslogd
22516 254463 1 0 3 0x100082 netio syslogd
29178 172402 1 77 3 0x100090 poll dhclient
51280 283180 1 0 3 0x80 poll dhclient
77592 408067 0 0 3 0x14200 pgzero zerothread
62066 183870 0 0 3 0x14200 aiodoned aiodoned
44446 421169 0 0 3 0x14200 syncer update
9041 161261 0 0 3 0x14200 cleaner cleaner
25947 196602 0 0 2 0x14200 reaper
79323 312361 0 0 3 0x14200 pgdaemon pagedaemon
96649 55405 0 0 3 0x14200 bored crynlk
83416 371981 0 0 3 0x14200 bored crypto
11699 263571 0 0 3 0x40014200 acpi0 acpi0
55336 262720 0 0 3 0x40014200 idle1
82577 46158 0 0 3 0x14200 bored softnet
29625 344390 0 0 3 0x14200 bored systqmp
5242 412546 0 0 3 0x14200 bored systq
14886 266583 0 0 3 0x40014200 bored softclock
98735 497455 0 0 3 0x40014200 idle0
88408 242489 0 0 3 0x14200 bored smr
1 38117 0 0 3 0x82 wait init
CPU 1:
exclusive mutex &pr->ps_mtx r = 0 (0xffff800020afb598)
#4 exit1+0x8bf sys/kern/kern_exit.c:349
pcb 25 9K 9K 78643K 57 0 0
rtable 61 2K 2K 78643K 125 0 0
ifaddr 25 7K 7K 78643K 26 0 0
proc 52 50K 58K 78643K 279 0 0
exec 0 0K 1K 78643K 179 0 0
temp 39 2716K 2780K 78643K 7748 0 0
8 0
inpcbpl 280 29 0 23 1 0 1 1 0
8 0
plimitpl 152 14 0 8 1 0 1 1 0
8 0
8 0
syncache 264 5 0 5 2 2 0 1 0
8 0
tcpcb 544 8 0 5 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 8 0 6 2 1 1 1 0
8 0
pfstkey 112 8 0 6 2 1 1 1 0
8 0
pfstate 328 8 0 6 2 1 1 1 0
8 0
pfrule 1360 21 0 16 2 1 1 2 0
8 0
8 0
art_table 32 97 0 0 1 0 1 1 0
8 0
art_node 16 22 0 2 1 0 1 1 0
8 0
8 0
ffsino 272 4267 0 2888 92 0 92 92 0
8 0
nchpl 144 7312 0 5775 57 0 57 57 0
8 0
uvmvnodes 72 4277 0 0 78 0 78 78 0
8 0
vnodes 200 4277 0 0 226 0 226 226 0
8 0
namei 1024 15044 0 15044 3 2 1 1 0
8 1
sigapl 432 3077 0 3065 2 0 2 2 0
8 0
futexpl 56 3016 0 3016 1 0 1 1 0
8 1
knotepl 112 5 0 0 1 0 1 1 0
8 0
kqueuepl 104 1 0 0 1 0 1 1 0
8 0
pipepl 112 134 0 127 3 2 1 1 0
8 0
fdescpl 488 3078 0 3065 3 0 3 3 0
8 0
filepl 152 3830 0 3783 2 0 2 2 0
8 0
lockfpl 104 6 0 6 1 1 0 1 0
8 0
lockfspl 48 3 0 3 1 1 0 1 0
8 0
sessionpl 112 18 0 9 1 0 1 1 0
8 0
pgrppl 48 18 0 9 1 0 1 1 0
8 0
ucredpl 96 52 0 43 1 0 1 1 0
8 0
zombiepl 144 3065 0 3064 3 2 1 1 0
8 0
processpl 888 3093 0 3064 4 0 4 4 0
8 0
procpl 600 5965 0 5935 3 0 3 3 0
8 0
sockpl 384 73 0 55 2 0 2 2 0
8 0
8 0
bufpl 256 5051 0 287 298 0 298 298 0
8 0
anonpl 16 150840 0 149550 9 3 6 7 0
125 0
amapchunkpl 152 9168 0 9128 2 0 2 2 0
158 0
amappl16 192 6273 0 6263 1 0 1 1 0
8 0
amappl14 176 16 0 15 3 2 1 1 0
8 0
amappl12 160 5 0 5 2 2 0 1 0
8 0
amappl11 152 49 0 31 1 0 1 1 0
8 0
amappl10 144 59 0 57 1 0 1 1 0
8 0
amappl9 136 423 0 422 1 0 1 1 0
8 0
amappl8 128 102 0 97 1 0 1 1 0
8 0
amappl7 120 21 0 19 1 0 1 1 0
8 0
amappl6 112 45 0 41 1 0 1 1 0
8 0
amappl5 104 126 0 113 1 0 1 1 0
8 0
amappl4 96 3251 0 3229 1 0 1 1 0
8 0
amappl3 88 3035 0 3022 1 0 1 1 0
8 0
amappl2 80 23807 0 23744 4 2 2 2 0
8 0
amappl1 72 70251 0 69813 16 6 10 16 0
8 0
amappl 80 6170 0 6147 1 0 1 1 0
8 0
vmmpekpl 168 17091 0 17070 2 0 2 2 0
8 0
vmmpepl 168 226834 0 225944 57 18 39 51 0
357 0
vmsppl 360 3077 0 3064 2 0 2 2 0
8 0
pdppl 4096 6164 0 6128 6 0 6 6 0
8 0
pvpl 32 379562 0 376447 35 9 26 28 0
265 0
pmappl 232 3077 0 3064 1 0 1 1 0
8 0
8 0
HEAD commit: 337db085 Fix warnings, from Ben Boeckel.
git tree: openbsd
kernel config: https://syzkaller.appspot.com/x/.config?x=7f659e47e42d9641
dashboard link: https://syzkaller.appspot.com/bug?extid=8e4863b3dde88eb706dc
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=133710a6a00000
dashboard link: https://syzkaller.appspot.com/bug?extid=8e4863b3dde88eb706dc
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=177b5bcea00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+8e4863...@syzkaller.appspotmail.com
1st 0xffff800020afb598 &pr->ps_mtx (&pr->ps_mtx)
2nd 0xffffffff82384c80 &sched_lock (&sched_lock)
#7 mtx_leave+0x97 sys/kern/kern_lock.c:360
#8 sched_exit+0x112 sys/kern/kern_sched.c:225
#9 exit1+0x8bf sys/kern/kern_exit.c:349
#10 sys_exit+0x17 sys/kern/kern_exit.c:94
#11 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline]
#11 syscall+0x552 sys/arch/amd64/amd64/trap.c:574
#12 Xsyscall+0x128
Stopped at db_enter+0x18: addq $0x8,%rsp
ddb{1}>
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
the kernel did not panic
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
witness_checkorder(ffffffff82384c80,9,0) at witness_checkorder+0xffc
witness_debugger sys/kern/subr_witness.c:2504 [inline]
witness_checkorder(ffffffff82384c80,9,0) at witness_checkorder+0xffc
sys/kern/subr_witness.c:1084
__mp_lock(ffffffff82384a78) at __mp_lock+0xa1
schedclock(ffff800020b84bc8) at schedclock+0x99 sys/kern/sched_bsd.c:547
hardclock(ffff800020bc3b70) at hardclock+0x1d8 sys/kern/kern_clock.c:174
lapic_clockintr(0,0) at lapic_clockintr+0x44
sys/arch/amd64/amd64/lapic.c:425
Xresume_lapic_ltimer(9,10,0,0,ffffffff821fc960,ffff800020ab0ff0) at
sys/arch/amd64/amd64/lapic.c:425
Xresume_lapic_ltimer+0x26
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x3f
sys/dev/kcov.c:111
mtx_leave(ffff800020afb588) at mtx_leave+0x97 sys/kern/kern_lock.c:360
sched_exit(ffff800020b84bc8) at sched_exit+0x112 sys/kern/kern_sched.c:225
exit1(ffff800020b84bc8,0,1) at exit1+0x8bf sys/kern/kern_exit.c:349
sys_exit(ffff800020b84bc8,ffff800020bc3e40,ffff800020bc3eb0) at
sys_exit+0x17 sys/kern/kern_exit.c:94
syscall(ffff800020bc3f20) at syscall+0x552 mi_syscall
sys/sys/syscall_mi.h:99 [inline]
syscall(ffff800020bc3f20) at syscall+0x552 sys/arch/amd64/amd64/trap.c:574
Xsyscall(6,1,b37,1,431bde82d7b634db,0) at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffc1e30, count: -14
ddb{1}> show registers
rdi 0x3
rsi 0xffffffff821fc9e0 __sancov_gen_cov_switch_values.122
rbp 0xffff800020bc3970
rbx 0x3
rdx 0x8b
rcx 0x3
rax 0x3
r8 0xffffffff818c8c95 witness_checkorder+0xfd5
r9 0x5
r10 0x876747a7c1d9b7
r11 0xf2b5b9c07cb905cc
r12 0xfffffd8002661340
r13 0xc
r14 0xffffffff82338720 w_lodata+0x4d4d0
r15 0xffffffff82342280 w_lodata+0x57030
rip 0xffffffff81a42468 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800020bc3960
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
db_enter+0x18: addq $0x8,%rsp
PROC (syz-executor9206) pid=9778 stat=dead
flags process=1008<EXITING,SINGLEEXIT> proc=2000<WEXIT>
pri=50, usrpri=64, nice=20
forw=0xffffffffffffffff, list=0xffffffffffffffff,0xffffffffffffffff
process=0xffff800020afb4d8 user=0xffff800020bbe000,
vmspace=0xfffffd806e7c7170
estcpu=36, cpticks=2, pctcpu=0.0
user=0, sys=1, intr=0
ddb{1}> ps
user=0, sys=1, intr=0
PID TID PPID UID S FLAGS WAIT COMMAND
27229 1254 31685 0 3 0x82 nanosleep syz-executor9206
31685 150067 81105 0 3 0x10008a pause ksh
81105 390242 5389 0 3 0x92 select sshd
33145 418147 1 0 3 0x100083 ttyin getty
5389 116262 1 0 3 0x80 select sshd
28812 268777 95944 74 3 0x100092 bpf pflogd
95944 479827 1 0 3 0x80 netio pflogd
96392 280797 22516 73 7 0x100090 syslogd
22516 254463 1 0 3 0x100082 netio syslogd
29178 172402 1 77 3 0x100090 poll dhclient
51280 283180 1 0 3 0x80 poll dhclient
77592 408067 0 0 3 0x14200 pgzero zerothread
62066 183870 0 0 3 0x14200 aiodoned aiodoned
44446 421169 0 0 3 0x14200 syncer update
9041 161261 0 0 3 0x14200 cleaner cleaner
25947 196602 0 0 2 0x14200 reaper
79323 312361 0 0 3 0x14200 pgdaemon pagedaemon
96649 55405 0 0 3 0x14200 bored crynlk
83416 371981 0 0 3 0x14200 bored crypto
11699 263571 0 0 3 0x40014200 acpi0 acpi0
55336 262720 0 0 3 0x40014200 idle1
82577 46158 0 0 3 0x14200 bored softnet
29625 344390 0 0 3 0x14200 bored systqmp
5242 412546 0 0 3 0x14200 bored systq
14886 266583 0 0 3 0x40014200 bored softclock
98735 497455 0 0 3 0x40014200 idle0
88408 242489 0 0 3 0x14200 bored smr
1 38117 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
CPU 1:
exclusive mutex &pr->ps_mtx r = 0 (0xffff800020afb598)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1161
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 sched_exit+0xa5 sys/kern/kern_sched.c:224
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#4 exit1+0x8bf sys/kern/kern_exit.c:349
#5 sys_exit+0x17 sys/kern/kern_exit.c:94
#6 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline]
#6 syscall+0x552 sys/arch/amd64/amd64/trap.c:574
#7 Xsyscall+0x128
ddb{1}> show malloc
#6 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:99 [inline]
#6 syscall+0x552 sys/arch/amd64/amd64/trap.c:574
#7 Xsyscall+0x128
Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim
devbuf 9450 6382K 6383K 78643K 10537 0 0
pcb 25 9K 9K 78643K 57 0 0
rtable 61 2K 2K 78643K 125 0 0
ifaddr 25 7K 7K 78643K 26 0 0
counters 39 33K 33K 78643K 39 0 0
ioctlops 0 0K 4K 78643K 1467 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1175 74K 74K 78643K 1180 0 0
UFS quota 1 32K 32K 78643K 1 0 0
UFS mount 5 36K 36K 78643K 5 0 0
shm 2 1K 1K 78643K 2 0 0
UFS mount 5 36K 36K 78643K 5 0 0
VM map 2 1K 1K 78643K 2 0 0
sem 2 0K 0K 78643K 2 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1808 196K 290K 78643K 12628 0 0
file desc 1 0K 0K 78643K 1 0 0
ACPI 1808 196K 290K 78643K 12628 0 0
proc 52 50K 58K 78643K 279 0 0
NFS srvsock 1 0K 0K 78643K 1 0 0
NFS daemon 1 16K 16K 78643K 1 0 0
in_multi 11 0K 0K 78643K 11 0 0
NFS daemon 1 16K 16K 78643K 1 0 0
ether_multi 1 0K 0K 78643K 1 0 0
ISOFS mount 1 32K 32K 78643K 1 0 0
MSDOSFS mount 1 16K 16K 78643K 1 0 0
ttys 18 79K 79K 78643K 18 0 0
ISOFS mount 1 32K 32K 78643K 1 0 0
MSDOSFS mount 1 16K 16K 78643K 1 0 0
exec 0 0K 1K 78643K 179 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 62 3K 3K 78643K 6563 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 aobj 2 2K 2K 78643K 2 0 0
memdesc 1 4K 4K 78643K 1 0 0
crypto data 1 1K 1K 78643K 1 0 0
NDP 4 0K 0K 78643K 4 0 0
memdesc 1 4K 4K 78643K 1 0 0
crypto data 1 1K 1K 78643K 1 0 0
temp 39 2716K 2780K 78643K 7748 0 0
SYN cache 2 16K 16K 78643K 2 0 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg
Idle
arp 64 2 0 0 1 0 1 1 0
Idle
8 0
inpcbpl 280 29 0 23 1 0 1 1 0
8 0
plimitpl 152 14 0 8 1 0 1 1 0
8 0
plcache 128 20 0 0 1 0 1 1 0
8 0
rtentry 112 23 0 1 1 0 1 1 0
8 0
8 0
syncache 264 5 0 5 2 2 0 1 0
8 0
tcpcb 544 8 0 5 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 8 0 6 2 1 1 1 0
8 0
pfstkey 112 8 0 6 2 1 1 1 0
8 0
pfstate 328 8 0 6 2 1 1 1 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 96 0 0 6 0 6 6 0
8 0
8 0
art_table 32 97 0 0 1 0 1 1 0
8 0
art_node 16 22 0 2 1 0 1 1 0
8 0
dirhash 1024 17 0 0 3 0 3 3 0
8 0
dino1pl 128 4267 0 2888 45 0 45 45 0
8 0
8 0
ffsino 272 4267 0 2888 92 0 92 92 0
8 0
nchpl 144 7312 0 5775 57 0 57 57 0
8 0
uvmvnodes 72 4277 0 0 78 0 78 78 0
8 0
vnodes 200 4277 0 0 226 0 226 226 0
8 0
namei 1024 15044 0 15044 3 2 1 1 0
8 1
percpumem 16 30 0 0 1 0 1 1 0
8 0
scxspl 192 19776 0 19776 30 29 1 6 0
percpumem 16 30 0 0 1 0 1 1 0
8 0
8 1
sigapl 432 3077 0 3065 2 0 2 2 0
8 0
futexpl 56 3016 0 3016 1 0 1 1 0
8 1
knotepl 112 5 0 0 1 0 1 1 0
8 0
kqueuepl 104 1 0 0 1 0 1 1 0
8 0
pipepl 112 134 0 127 3 2 1 1 0
8 0
fdescpl 488 3078 0 3065 3 0 3 3 0
8 0
filepl 152 3830 0 3783 2 0 2 2 0
8 0
lockfpl 104 6 0 6 1 1 0 1 0
8 0
lockfspl 48 3 0 3 1 1 0 1 0
8 0
sessionpl 112 18 0 9 1 0 1 1 0
8 0
pgrppl 48 18 0 9 1 0 1 1 0
8 0
ucredpl 96 52 0 43 1 0 1 1 0
8 0
zombiepl 144 3065 0 3064 3 2 1 1 0
8 0
processpl 888 3093 0 3064 4 0 4 4 0
8 0
procpl 600 5965 0 5935 3 0 3 3 0
8 0
sockpl 384 73 0 55 2 0 2 2 0
8 0
mcl4k 4096 3 0 0 1 0 1 1 0
8 0
mcl2k 2048 83 0 0 9 0 9 9 0
8 0
8 0
mtagpl 80 1 0 0 1 0 1 1 0
8 0
mbufpl 256 104 0 0 6 0 6 6 0
mtagpl 80 1 0 0 1 0 1 1 0
8 0
8 0
bufpl 256 5051 0 287 298 0 298 298 0
8 0
anonpl 16 150840 0 149550 9 3 6 7 0
125 0
amapchunkpl 152 9168 0 9128 2 0 2 2 0
158 0
amappl16 192 6273 0 6263 1 0 1 1 0
8 0
amappl14 176 16 0 15 3 2 1 1 0
8 0
amappl12 160 5 0 5 2 2 0 1 0
8 0
amappl11 152 49 0 31 1 0 1 1 0
8 0
amappl10 144 59 0 57 1 0 1 1 0
8 0
amappl9 136 423 0 422 1 0 1 1 0
8 0
amappl8 128 102 0 97 1 0 1 1 0
8 0
amappl7 120 21 0 19 1 0 1 1 0
8 0
amappl6 112 45 0 41 1 0 1 1 0
8 0
amappl5 104 126 0 113 1 0 1 1 0
8 0
amappl4 96 3251 0 3229 1 0 1 1 0
8 0
amappl3 88 3035 0 3022 1 0 1 1 0
8 0
amappl2 80 23807 0 23744 4 2 2 2 0
8 0
amappl1 72 70251 0 69813 16 6 10 16 0
8 0
amappl 80 6170 0 6147 1 0 1 1 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
dma64 64 259 0 259 1 1 0 1 0
8 0
dma32 32 7 0 7 1 1 0 1 0
8 0
dma16 16 17 0 17 1 1 0 1 0
8 0
aobjpl 64 1 0 0 1 0 1 1 0
8 0
uaddrrnd 24 3078 0 3064 1 0 1 1 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
dma64 64 259 0 259 1 1 0 1 0
8 0
dma32 32 7 0 7 1 1 0 1 0
8 0
dma16 16 17 0 17 1 1 0 1 0
8 0
aobjpl 64 1 0 0 1 0 1 1 0
8 0
8 0
uaddrbest 32 2 0 0 1 0 1 1 0
8 0
uaddr 24 3078 0 3064 1 0 1 1 0
uaddrbest 32 2 0 0 1 0 1 1 0
8 0
8 0
vmmpekpl 168 17091 0 17070 2 0 2 2 0
8 0
vmmpepl 168 226834 0 225944 57 18 39 51 0
357 0
vmsppl 360 3077 0 3064 2 0 2 2 0
8 0
pdppl 4096 6164 0 6128 6 0 6 6 0
8 0
pvpl 32 379562 0 376447 35 9 26 28 0
265 0
pmappl 232 3077 0 3064 1 0 1 1 0
8 0
extentpl 40 41 0 26 1 0 1 1 0
8 0
phpool 112 430 0 5 13 0 13 13 0
8 0
8 0
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