panic: mtx ADDR: locking against myself (3)
0 views
Skip to first unread message
syzbot
Nov 4, 2025, 8:19:26 PM (2 days ago) Nov 4
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: e111ebd78232 In rde_reload_done() prevent use-after-free i..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=13b3417c580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=b94c4a87f48bfff1a17d
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/348e67e6fe0d/disk-e111ebd7.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/4f09a932d0fc/bsd-e111ebd7.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/63ee04e3e5c1/kernel-e111ebd7.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b94c4a...@syzkaller.appspotmail.com
panic: mtx 0xffffffff83939f50: locking against myself
Stopped at db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
389829 26792 0 0x14000 0x200 1 reaper
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff83354579) at panic+0x1e5 sys/kern/subr_prf.c:198
mtx_enter_try(ffffffff83939f50) at mtx_enter_try+0x1da
mtx_enter(ffffffff83939f50) at mtx_enter+0x62 sys/kern/kern_lock.c:261
witness_checkorder(ffff80000002ca60,9,0) at witness_checkorder+0x6ea sys/kern/subr_witness.c:903
mtx_enter(ffff80000002ca50) at mtx_enter+0x4a sys/kern/kern_lock.c:260
ioapic_hwmask(ffff80000002ca00,9) at ioapic_hwmask+0x83 sys/arch/amd64/amd64/ioapic.c:473
Xintr_ioapic_level9_untramp() at Xintr_ioapic_level9_untramp+0x22c
itismychild(fffffd8003f27300,fffffd8003f29e40) at itismychild+0x42d adopt sys/kern/subr_witness.c:1594 [inline]
itismychild(fffffd8003f27300,fffffd8003f29e40) at itismychild+0x42d sys/kern/subr_witness.c:1656
witness_checkorder(ffffffff837b7e08,9,0) at witness_checkorder+0x118e sys/kern/subr_witness.c:1095
mtx_enter(ffffffff837b7df8) at mtx_enter+0x4a sys/kern/kern_lock.c:260
clockintr_cancel(ffffffff837b72f8) at clockintr_cancel+0x2f sys/kern/kern_clockintr.c:323
mi_switch() at mi_switch+0x16f sys/kern/sched_bsd.c:376
sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:367
end trace frame: 0xffff80002a3bace0, count: 0
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
*cpu0: mtx 0xffffffff83939f50: locking against myself
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff83354579) at panic+0x1e5 sys/kern/subr_prf.c:198
mtx_enter_try(ffffffff83939f50) at mtx_enter_try+0x1da
mtx_enter(ffffffff83939f50) at mtx_enter+0x62 sys/kern/kern_lock.c:261
witness_checkorder(ffff80000002ca60,9,0) at witness_checkorder+0x6ea sys/kern/subr_witness.c:903
mtx_enter(ffff80000002ca50) at mtx_enter+0x4a sys/kern/kern_lock.c:260
ioapic_hwmask(ffff80000002ca00,9) at ioapic_hwmask+0x83 sys/arch/amd64/amd64/ioapic.c:473
Xintr_ioapic_level9_untramp() at Xintr_ioapic_level9_untramp+0x22c
itismychild(fffffd8003f27300,fffffd8003f29e40) at itismychild+0x42d adopt sys/kern/subr_witness.c:1594 [inline]
itismychild(fffffd8003f27300,fffffd8003f29e40) at itismychild+0x42d sys/kern/subr_witness.c:1656
witness_checkorder(ffffffff837b7e08,9,0) at witness_checkorder+0x118e sys/kern/subr_witness.c:1095
mtx_enter(ffffffff837b7df8) at mtx_enter+0x4a sys/kern/kern_lock.c:260
clockintr_cancel(ffffffff837b72f8) at clockintr_cancel+0x2f sys/kern/kern_clockintr.c:323
mi_switch() at mi_switch+0x16f sys/kern/sched_bsd.c:376
sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:367
sys_futex(ffff80002f3c9248,ffff80002a3badc0,ffff80002a3bad10) at sys_futex+0xb90 futex_wait sys/kern/sys_futex.c:306 [inline]
sys_futex(ffff80002f3c9248,ffff80002a3badc0,ffff80002a3bad10) at sys_futex+0xb90 sys/kern/sys_futex.c:155
syscall(ffff80002a3badc0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a3badc0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x9bdcae64890, count: -17
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff80002a3ba600
rbx 0xffffffff837b7ddf cpu_info_full_primary+0x2ddf
rdx 0
rcx 0xffff80002f3c9248
rax 0xffffffff837b6ff0 cpu_info_full_primary+0x1ff0
r8 0x101010101010101
r9 0x8080808080808080
r10 0x328226a9fae74e27
r11 0x4ecac0e018343f7c
r12 0xffffffff837b7be0 cpu_info_full_primary+0x2be0
r13 0
r14 0
r15 0x1
rip 0xffffffff820f25c5 db_enter+0x25
cs 0x8
rflags 0x46
rsp 0xffff80002a3ba5f0
ss 0x10
db_enter+0x25: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor) tid=155474 pid=77545 tcnt=4 stat=sleep
flags process=4000010<SUGID,ITIMER> proc=4000080<SINTR,THREAD>
runpri=63, usrpri=63, slppri=32, nice=20
wchan=0xffff80002a3bac30, wmesg=fsleep, ps_single=0x0 scnt=0 ecnt=0
forw=0x0, list=0xffff80002f3c8d18,0xffff80002f3c8fc0
process=0xffff8000fffe7510 user=0xffff80002a3b5000, vmspace=0xfffffd806c0e9210
estcpu=13, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
83055 99787 41462 32767 3 0x3010 suspend syz-executor
83055 395991 41462 32767 2 0x4081010 syz-executor
83055 390011 41462 32767 2 0x4081010 syz-executor
77545 317783 49267 32767 2 0x4000010 syz-executor
77545 241089 49267 32767 3 0x4000090 fsleep syz-executor
*77545 155474 49267 32767 3 0x4000090 fsleep syz-executor
77545 349669 49267 32767 2 0x4000010 syz-executor
45441 441934 34952 0 2 0x2 syz-executor
62404 210569 66116 32767 3 0x90 piperd syz-executor
49267 202372 32595 32767 3 0x90 nanoslp syz-executor
34461 498051 30264 32767 3 0x90 piperd syz-executor
58532 9813 19435 32767 3 0x90 piperd syz-executor
70344 3118 59250 32767 3 0x90 piperd syz-executor
32201 108866 3135 32767 3 0x90 piperd syz-executor
41462 510571 90402 32767 3 0x90 nanoslp syz-executor
59250 288768 34952 0 3 0x82 wait syz-executor
30264 211407 34952 0 3 0x82 wait syz-executor
3135 45386 34952 0 3 0x82 wait syz-executor
66116 316015 34952 0 3 0x82 wait syz-executor
19435 206939 34952 0 3 0x82 wait syz-executor
90402 129496 34952 0 3 0x82 wait syz-executor
32595 257826 34952 0 3 0x82 wait syz-executor
34952 276852 58986 0 2 0x2 syz-executor
58986 115279 66347 0 3 0x10008a sigsusp ksh
66347 342455 85050 0 3 0x98 kqread sshd-session
85050 323489 57267 0 3 0x92 kqread sshd-session
50818 278461 1 0 3 0x100083 ttyin getty
57267 435459 1 0 3 0x88 kqread sshd
80280 243924 66815 73 3 0x1100090 kqread syslogd
66815 204557 1 0 3 0x100082 sbwait syslogd
61132 93085 1 0 3 0x100080 kqread resolvd
11152 391552 34371 77 3 0x100092 kqread dhcpleased
90226 174065 34371 77 3 0x100092 kqread dhcpleased
34371 12098 1 0 3 0x80 kqread dhcpleased
28495 233482 0 0 3 0x14200 bored smr
16380 324338 0 0 2 0x14200 zerothread
1413 262911 0 0 3 0x14200 aiodoned aiodoned
72809 317265 0 0 3 0x14200 syncer update
23827 138912 0 0 3 0x14200 cleaner cleaner
26792 389829 0 0 7 0x14200 reaper
25705 385146 0 0 3 0x14200 pgdaemon pagedaemon
58417 157068 0 0 3 0x14200 bored viomb
57744 235171 0 0 3 0x40014200 acpi0 acpi0
31019 244111 0 0 3 0x40014200 idle1
5679 135968 0 0 3 0x14200 bored softnet1
22801 284112 0 0 3 0x14200 bored softnet0
8262 224763 0 0 3 0x14200 bored systqmp
99101 200806 0 0 3 0x14200 bored systq
44930 254672 0 0 3 0x14200 tmoslp softclockmp
20279 333024 0 0 3 0x40014200 tmoslp softclock
45089 355359 0 0 3 0x40014200 idle0
1 123907 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &sched_lock r = 0 (0xffffffff838ad2f8)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:311
#2 mtx_enter+0x62 sys/kern/kern_lock.c:261
#3 sleep_finish+0x1d6 sys/kern/kern_synch.c:355
#4 sys_futex+0xb90 futex_wait sys/kern/sys_futex.c:306 [inline]
#4 sys_futex+0xb90 sys/kern/sys_futex.c:155
#5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765
#6 Xsyscall+0x128
CPU 1:
exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff8390c330)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:311
#2 mtx_enter+0x62 sys/kern/kern_lock.c:261
#3 uvm_pmr_freepageq+0x15c sys/uvm/uvm_pmemrange.c:1371
#4 km_free+0x36b sys/uvm/uvm_km.c:827
#5 uvm_uarea_free+0x4f sys/uvm/uvm_glue.c:304
#6 reaper+0x1aa sys/kern/kern_exit.c:493
#7 proc_trampoline+0x10
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10184 10953K 10968K 166960K 11278 0
pcb 17 12K 12K 166960K 17 0
rtable 219 6K 7K 166960K 366 0
pf 29 16K 16K 166960K 31 0
ifaddr 38 6K 7K 166960K 44 0
ifgroup 46 2K 2K 166960K 50 0
sysctl 4 1K 9K 166960K 9 0
counters 66 36K 36K 166960K 68 0
ioctlops 0 0K 2K 166960K 32 0
iov 0 0K 16K 166960K 11 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1336 84K 84K 166960K 1514 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 11 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 0K 166960K 87 0
dirhash 12 2K 2K 166960K 18 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 19 66K 125K 166960K 434 0
sigio 0 0K 0K 166960K 10 0
proc 58 99K 147K 166960K 505 0
subproc 63 3K 4K 166960K 216 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 60 0
in_multi 88 6K 7K 166960K 109 0
ether_multi 1 0K 0K 166960K 2 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 67 307K 307K 166960K 67 0
exec 0 0K 1K 166960K 414 0
fusefs mount 1 32K 32K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 201 142K 167K 166960K 5129 0
UVM aobj 17 3K 3K 166960K 19 0
pinsyscall 40 80K 114K 166960K 1484 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 21 0
NDP 10 0K 2K 166960K 27 0
temp 40 8652K 8716K 166960K 7606 0
kqueue 13 20K 26K 166960K 69 0
SYN cache 2 16K 16K 166960K 2 0
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 26 0 0 1 0 1 1 0 8 0
rtpcb 120 54 0 51 1 0 1 1 0 8 0
rtentry 176 115 0 14 6 0 6 6 0 8 0
unpcb 144 194 0 179 2 0 2 2 0 8 1
syncache 336 7 0 7 2 1 1 1 0 8 1
tcpcb 736 158 0 154 5 1 4 4 0 8 3
arp 136 19 0 2 1 0 1 1 0 8 0
ipq 40 7 0 3 1 0 1 1 0 8 0
ipqe 40 16 0 10 1 0 1 1 0 8 0
inpcb 328 329 0 321 5 1 4 4 0 8 3
ip6q 72 2 0 1 1 0 1 1 0 8 0
ip6af 40 3 0 2 1 0 1 1 0 8 0
nd6 152 27 0 5 1 0 1 1 0 8 0
kcovpl 48 24 0 17 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 464 0 53 29 2 27 29 0 8 0
art_table 40 465 0 53 5 0 5 5 0 8 0
art_node 32 115 0 23 1 0 1 1 0 8 0
sysvmsgpl 40 5 0 2 1 0 1 1 0 8 0
semapl 112 85 0 75 1 0 1 1 0 8 0
shmpl 112 16 0 2 1 0 1 1 0 8 0
dirhash 1024 21 0 4 3 0 3 3 0 8 0
dino2pl 256 1917 0 391 96 0 96 96 0 8 0
ffsino 296 1917 0 391 118 0 118 118 0 8 0
nchpl 144 2408 0 711 64 0 64 64 0 8 0
vnodes 216 2142 0 0 119 0 119 119 0 8 0
namei 1024 7608 0 7608 1 0 1 1 0 8 1
percpumem 16 49 0 1 1 0 1 1 0 8 0
kstatmem 264 24 0 2 2 0 2 2 0 8 0
scxspl 216 8196 0 8196 5 4 1 4 1 8 1
plimitpl 152 106 0 84 2 1 1 2 0 8 0
sigapl 424 684 0 637 7 0 7 7 0 8 0
knotepl 120 522 0 0 16 0 16 16 0 8 0
kqueuepl 224 120 0 111 3 0 3 3 0 8 2
pipepl 344 195 0 168 3 0 3 3 0 8 0
fdescpl 528 668 0 637 4 1 3 4 0 8 0
filepl 160 3071 0 2878 11 0 11 11 0 8 2
lockfpl 104 59 0 57 1 0 1 1 0 8 0
lockfspl 48 20 0 18 1 0 1 1 0 8 0
sessionpl 144 39 0 24 1 0 1 1 0 8 0
pgrppl 48 72 0 49 1 0 1 1 0 8 0
ucredpl 104 369 0 351 1 0 1 1 0 8 0
zombiepl 144 638 0 637 1 0 1 1 0 8 0
processpl 1232 684 0 637 5 0 5 5 0 8 0
procpl 664 1080 0 1027 7 1 6 7 0 8 1
sosppl 176 3 0 3 2 1 1 1 0 8 1
sockpl 752 581 0 555 8 1 7 7 0 8 4
mcl64k 65536 4 0 0 1 0 1 1 0 8 0
mcl16k 16384 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 4 0 0 1 0 1 1 0 8 0
mcl4k 4096 110 0 0 14 0 14 14 0 8 0
mcl2k 2048 21 0 0 3 0 3 3 0 8 0
mtagpl 96 2 0 0 1 0 1 1 0 8 0
mbufpl 256 249 0 0 16 0 16 16 0 8 0
bufpl 280 2734 0 118 187 0 187 187 0 8 0
anonpl 32 8652 0 0 70 0 70 70 0 246 0
amapchunkpl 152 15665 0 15229 30 5 25 30 0 158 1
amappl16 200 2853 0 2804 24 8 16 16 0 8 11
amappl15 192 8 0 8 1 1 0 1 0 8 0
amappl14 184 9 0 9 1 1 0 1 0 8 0
amappl13 176 427 0 426 1 0 1 1 0 8 0
amappl12 168 1003 0 964 3 0 3 3 0 8 0
amappl11 160 28 0 28 1 1 0 1 0 8 0
amappl10 152 43 0 33 1 0 1 1 0 8 0
amappl9 144 243 0 243 1 1 0 1 0 8 0
amappl8 136 40 0 37 1 0 1 1 0 8 0
amappl7 128 78 0 76 1 0 1 1 0 8 0
amappl6 120 275 0 264 1 0 1 1 0 8 0
amappl5 112 79 0 72 1 0 1 1 0 8 0
amappl4 104 369 0 344 1 0 1 1 0 8 0
amappl3 96 2579 0 2512 3 0 3 3 0 8 0
amappl2 88 787 0 718 2 0 2 2 0 8 0
amappl1 80 10327 0 9788 14 0 14 14 0 8 0
amappl 88 4397 0 4262 5 0 5 5 0 92 0
uvmvnodes 80 2142 0 0 44 0 44 44 0 8 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma1024 1024 1 0 0 1 0 1 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 72 18 0 2 1 0 1 1 0 8 0
uaddrrnd 24 668 0 637 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 668 0 637 1 0 1 1 0 8 0
vmmpekpl 168 7303 0 7266 3 0 3 3 0 8 0
vmmpepl 168 51067 0 49311 101 7 94 101 0 357 1
vmsppl 488 667 0 637 7 2 5 6 0 8 0
rwobjpl 80 18994 0 16036 65 0 65 65 0 8 2
pdppl 4096 1344 0 1274 124 40 84 98 0 8 14
pvpl 32 15068 0 0 122 0 122 122 0 265 0
pmappl 256 667 0 637 4 1 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 304 0 47 8 0 8 8 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff83354579) at panic+0x1e5 sys/kern/subr_prf.c:198
mtx_enter_try(ffffffff83939f50) at mtx_enter_try+0x1da
mtx_enter(ffffffff83939f50) at mtx_enter+0x62 sys/kern/kern_lock.c:261
witness_checkorder(ffff80000002ca60,9,0) at witness_checkorder+0x6ea sys/kern/subr_witness.c:903
mtx_enter(ffff80000002ca50) at mtx_enter+0x4a sys/kern/kern_lock.c:260
ioapic_hwmask(ffff80000002ca00,9) at ioapic_hwmask+0x83 sys/arch/amd64/amd64/ioapic.c:473
Xintr_ioapic_level9_untramp() at Xintr_ioapic_level9_untramp+0x22c
itismychild(fffffd8003f27300,fffffd8003f29e40) at itismychild+0x42d adopt sys/kern/subr_witness.c:1594 [inline]
itismychild(fffffd8003f27300,fffffd8003f29e40) at itismychild+0x42d sys/kern/subr_witness.c:1656
witness_checkorder(ffffffff837b7e08,9,0) at witness_checkorder+0x118e sys/kern/subr_witness.c:1095
mtx_enter(ffffffff837b7df8) at mtx_enter+0x4a sys/kern/kern_lock.c:260
clockintr_cancel(ffffffff837b72f8) at clockintr_cancel+0x2f sys/kern/kern_clockintr.c:323
mi_switch() at mi_switch+0x16f sys/kern/sched_bsd.c:376
sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:367
sys_futex(ffff80002f3c9248,ffff80002a3badc0,ffff80002a3bad10) at sys_futex+0xb90 futex_wait sys/kern/sys_futex.c:306 [inline]
sys_futex(ffff80002f3c9248,ffff80002a3badc0,ffff80002a3bad10) at sys_futex+0xb90 sys/kern/sys_futex.c:155
syscall(ffff80002a3badc0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a3badc0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x9bdcae64890, count: -17
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffff8000299edff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
mtx_enter(ffffffff838ad2e8) at mtx_enter+0xd2 sys/kern/kern_lock.c:264
wakeup_n(ffffffff8390c180,ffffffff) at wakeup_n+0x54 sys/kern/kern_synch.c:579
uvm_pmr_freepageq(ffff80002a2449b8) at uvm_pmr_freepageq+0x3b6 sys/uvm/uvm_pmemrange.c:1389
km_free(ffff8000357eb000,6000,ffffffff835ca008,ffffffff834434e8) at km_free+0x36b sys/uvm/uvm_km.c:827
uvm_uarea_free(ffff8000fffef240) at uvm_uarea_free+0x4f sys/uvm/uvm_glue.c:304
reaper(ffff8000ffffdc90) at reaper+0x1aa sys/kern/kern_exit.c:493
end trace frame: 0x0, count: 6
ddb{1}> trace
x86_ipi_db(ffff8000299edff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
mtx_enter(ffffffff838ad2e8) at mtx_enter+0xd2 sys/kern/kern_lock.c:264
wakeup_n(ffffffff8390c180,ffffffff) at wakeup_n+0x54 sys/kern/kern_synch.c:579
uvm_pmr_freepageq(ffff80002a2449b8) at uvm_pmr_freepageq+0x3b6 sys/uvm/uvm_pmemrange.c:1389
km_free(ffff8000357eb000,6000,ffffffff835ca008,ffffffff834434e8) at km_free+0x36b sys/uvm/uvm_km.c:827
uvm_uarea_free(ffff8000fffef240) at uvm_uarea_free+0x4f sys/uvm/uvm_glue.c:304
reaper(ffff8000ffffdc90) at reaper+0x1aa sys/kern/kern_exit.c:493
end trace frame: 0x0, count: -9
---
This report 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 issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: e111ebd78232 In rde_reload_done() prevent use-after-free i..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=13b3417c580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7058272de1526588
dashboard link: https://syzkaller.appspot.com/bug?extid=b94c4a87f48bfff1a17d
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/348e67e6fe0d/disk-e111ebd7.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/4f09a932d0fc/bsd-e111ebd7.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/63ee04e3e5c1/kernel-e111ebd7.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b94c4a...@syzkaller.appspotmail.com
panic: mtx 0xffffffff83939f50: locking against myself
Stopped at db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
389829 26792 0 0x14000 0x200 1 reaper
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff83354579) at panic+0x1e5 sys/kern/subr_prf.c:198
mtx_enter_try(ffffffff83939f50) at mtx_enter_try+0x1da
mtx_enter(ffffffff83939f50) at mtx_enter+0x62 sys/kern/kern_lock.c:261
witness_checkorder(ffff80000002ca60,9,0) at witness_checkorder+0x6ea sys/kern/subr_witness.c:903
mtx_enter(ffff80000002ca50) at mtx_enter+0x4a sys/kern/kern_lock.c:260
ioapic_hwmask(ffff80000002ca00,9) at ioapic_hwmask+0x83 sys/arch/amd64/amd64/ioapic.c:473
Xintr_ioapic_level9_untramp() at Xintr_ioapic_level9_untramp+0x22c
itismychild(fffffd8003f27300,fffffd8003f29e40) at itismychild+0x42d adopt sys/kern/subr_witness.c:1594 [inline]
itismychild(fffffd8003f27300,fffffd8003f29e40) at itismychild+0x42d sys/kern/subr_witness.c:1656
witness_checkorder(ffffffff837b7e08,9,0) at witness_checkorder+0x118e sys/kern/subr_witness.c:1095
mtx_enter(ffffffff837b7df8) at mtx_enter+0x4a sys/kern/kern_lock.c:260
clockintr_cancel(ffffffff837b72f8) at clockintr_cancel+0x2f sys/kern/kern_clockintr.c:323
mi_switch() at mi_switch+0x16f sys/kern/sched_bsd.c:376
sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:367
end trace frame: 0xffff80002a3bace0, count: 0
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
*cpu0: mtx 0xffffffff83939f50: locking against myself
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff83354579) at panic+0x1e5 sys/kern/subr_prf.c:198
mtx_enter_try(ffffffff83939f50) at mtx_enter_try+0x1da
mtx_enter(ffffffff83939f50) at mtx_enter+0x62 sys/kern/kern_lock.c:261
witness_checkorder(ffff80000002ca60,9,0) at witness_checkorder+0x6ea sys/kern/subr_witness.c:903
mtx_enter(ffff80000002ca50) at mtx_enter+0x4a sys/kern/kern_lock.c:260
ioapic_hwmask(ffff80000002ca00,9) at ioapic_hwmask+0x83 sys/arch/amd64/amd64/ioapic.c:473
Xintr_ioapic_level9_untramp() at Xintr_ioapic_level9_untramp+0x22c
itismychild(fffffd8003f27300,fffffd8003f29e40) at itismychild+0x42d adopt sys/kern/subr_witness.c:1594 [inline]
itismychild(fffffd8003f27300,fffffd8003f29e40) at itismychild+0x42d sys/kern/subr_witness.c:1656
witness_checkorder(ffffffff837b7e08,9,0) at witness_checkorder+0x118e sys/kern/subr_witness.c:1095
mtx_enter(ffffffff837b7df8) at mtx_enter+0x4a sys/kern/kern_lock.c:260
clockintr_cancel(ffffffff837b72f8) at clockintr_cancel+0x2f sys/kern/kern_clockintr.c:323
mi_switch() at mi_switch+0x16f sys/kern/sched_bsd.c:376
sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:367
sys_futex(ffff80002f3c9248,ffff80002a3badc0,ffff80002a3bad10) at sys_futex+0xb90 futex_wait sys/kern/sys_futex.c:306 [inline]
sys_futex(ffff80002f3c9248,ffff80002a3badc0,ffff80002a3bad10) at sys_futex+0xb90 sys/kern/sys_futex.c:155
syscall(ffff80002a3badc0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a3badc0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x9bdcae64890, count: -17
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff80002a3ba600
rbx 0xffffffff837b7ddf cpu_info_full_primary+0x2ddf
rdx 0
rcx 0xffff80002f3c9248
rax 0xffffffff837b6ff0 cpu_info_full_primary+0x1ff0
r8 0x101010101010101
r9 0x8080808080808080
r10 0x328226a9fae74e27
r11 0x4ecac0e018343f7c
r12 0xffffffff837b7be0 cpu_info_full_primary+0x2be0
r13 0
r14 0
r15 0x1
rip 0xffffffff820f25c5 db_enter+0x25
cs 0x8
rflags 0x46
rsp 0xffff80002a3ba5f0
ss 0x10
db_enter+0x25: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor) tid=155474 pid=77545 tcnt=4 stat=sleep
flags process=4000010<SUGID,ITIMER> proc=4000080<SINTR,THREAD>
runpri=63, usrpri=63, slppri=32, nice=20
wchan=0xffff80002a3bac30, wmesg=fsleep, ps_single=0x0 scnt=0 ecnt=0
forw=0x0, list=0xffff80002f3c8d18,0xffff80002f3c8fc0
process=0xffff8000fffe7510 user=0xffff80002a3b5000, vmspace=0xfffffd806c0e9210
estcpu=13, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
83055 99787 41462 32767 3 0x3010 suspend syz-executor
83055 395991 41462 32767 2 0x4081010 syz-executor
83055 390011 41462 32767 2 0x4081010 syz-executor
77545 317783 49267 32767 2 0x4000010 syz-executor
77545 241089 49267 32767 3 0x4000090 fsleep syz-executor
*77545 155474 49267 32767 3 0x4000090 fsleep syz-executor
77545 349669 49267 32767 2 0x4000010 syz-executor
45441 441934 34952 0 2 0x2 syz-executor
62404 210569 66116 32767 3 0x90 piperd syz-executor
49267 202372 32595 32767 3 0x90 nanoslp syz-executor
34461 498051 30264 32767 3 0x90 piperd syz-executor
58532 9813 19435 32767 3 0x90 piperd syz-executor
70344 3118 59250 32767 3 0x90 piperd syz-executor
32201 108866 3135 32767 3 0x90 piperd syz-executor
41462 510571 90402 32767 3 0x90 nanoslp syz-executor
59250 288768 34952 0 3 0x82 wait syz-executor
30264 211407 34952 0 3 0x82 wait syz-executor
3135 45386 34952 0 3 0x82 wait syz-executor
66116 316015 34952 0 3 0x82 wait syz-executor
19435 206939 34952 0 3 0x82 wait syz-executor
90402 129496 34952 0 3 0x82 wait syz-executor
32595 257826 34952 0 3 0x82 wait syz-executor
34952 276852 58986 0 2 0x2 syz-executor
58986 115279 66347 0 3 0x10008a sigsusp ksh
66347 342455 85050 0 3 0x98 kqread sshd-session
85050 323489 57267 0 3 0x92 kqread sshd-session
50818 278461 1 0 3 0x100083 ttyin getty
57267 435459 1 0 3 0x88 kqread sshd
80280 243924 66815 73 3 0x1100090 kqread syslogd
66815 204557 1 0 3 0x100082 sbwait syslogd
61132 93085 1 0 3 0x100080 kqread resolvd
11152 391552 34371 77 3 0x100092 kqread dhcpleased
90226 174065 34371 77 3 0x100092 kqread dhcpleased
34371 12098 1 0 3 0x80 kqread dhcpleased
28495 233482 0 0 3 0x14200 bored smr
16380 324338 0 0 2 0x14200 zerothread
1413 262911 0 0 3 0x14200 aiodoned aiodoned
72809 317265 0 0 3 0x14200 syncer update
23827 138912 0 0 3 0x14200 cleaner cleaner
26792 389829 0 0 7 0x14200 reaper
25705 385146 0 0 3 0x14200 pgdaemon pagedaemon
58417 157068 0 0 3 0x14200 bored viomb
57744 235171 0 0 3 0x40014200 acpi0 acpi0
31019 244111 0 0 3 0x40014200 idle1
5679 135968 0 0 3 0x14200 bored softnet1
22801 284112 0 0 3 0x14200 bored softnet0
8262 224763 0 0 3 0x14200 bored systqmp
99101 200806 0 0 3 0x14200 bored systq
44930 254672 0 0 3 0x14200 tmoslp softclockmp
20279 333024 0 0 3 0x40014200 tmoslp softclock
45089 355359 0 0 3 0x40014200 idle0
1 123907 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &sched_lock r = 0 (0xffffffff838ad2f8)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:311
#2 mtx_enter+0x62 sys/kern/kern_lock.c:261
#3 sleep_finish+0x1d6 sys/kern/kern_synch.c:355
#4 sys_futex+0xb90 futex_wait sys/kern/sys_futex.c:306 [inline]
#4 sys_futex+0xb90 sys/kern/sys_futex.c:155
#5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765
#6 Xsyscall+0x128
CPU 1:
exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff8390c330)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:311
#2 mtx_enter+0x62 sys/kern/kern_lock.c:261
#3 uvm_pmr_freepageq+0x15c sys/uvm/uvm_pmemrange.c:1371
#4 km_free+0x36b sys/uvm/uvm_km.c:827
#5 uvm_uarea_free+0x4f sys/uvm/uvm_glue.c:304
#6 reaper+0x1aa sys/kern/kern_exit.c:493
#7 proc_trampoline+0x10
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10184 10953K 10968K 166960K 11278 0
pcb 17 12K 12K 166960K 17 0
rtable 219 6K 7K 166960K 366 0
pf 29 16K 16K 166960K 31 0
ifaddr 38 6K 7K 166960K 44 0
ifgroup 46 2K 2K 166960K 50 0
sysctl 4 1K 9K 166960K 9 0
counters 66 36K 36K 166960K 68 0
ioctlops 0 0K 2K 166960K 32 0
iov 0 0K 16K 166960K 11 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1336 84K 84K 166960K 1514 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 11 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 0K 166960K 87 0
dirhash 12 2K 2K 166960K 18 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 19 66K 125K 166960K 434 0
sigio 0 0K 0K 166960K 10 0
proc 58 99K 147K 166960K 505 0
subproc 63 3K 4K 166960K 216 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 60 0
in_multi 88 6K 7K 166960K 109 0
ether_multi 1 0K 0K 166960K 2 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 67 307K 307K 166960K 67 0
exec 0 0K 1K 166960K 414 0
fusefs mount 1 32K 32K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 201 142K 167K 166960K 5129 0
UVM aobj 17 3K 3K 166960K 19 0
pinsyscall 40 80K 114K 166960K 1484 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 21 0
NDP 10 0K 2K 166960K 27 0
temp 40 8652K 8716K 166960K 7606 0
kqueue 13 20K 26K 166960K 69 0
SYN cache 2 16K 16K 166960K 2 0
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 26 0 0 1 0 1 1 0 8 0
rtpcb 120 54 0 51 1 0 1 1 0 8 0
rtentry 176 115 0 14 6 0 6 6 0 8 0
unpcb 144 194 0 179 2 0 2 2 0 8 1
syncache 336 7 0 7 2 1 1 1 0 8 1
tcpcb 736 158 0 154 5 1 4 4 0 8 3
arp 136 19 0 2 1 0 1 1 0 8 0
ipq 40 7 0 3 1 0 1 1 0 8 0
ipqe 40 16 0 10 1 0 1 1 0 8 0
inpcb 328 329 0 321 5 1 4 4 0 8 3
ip6q 72 2 0 1 1 0 1 1 0 8 0
ip6af 40 3 0 2 1 0 1 1 0 8 0
nd6 152 27 0 5 1 0 1 1 0 8 0
kcovpl 48 24 0 17 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 464 0 53 29 2 27 29 0 8 0
art_table 40 465 0 53 5 0 5 5 0 8 0
art_node 32 115 0 23 1 0 1 1 0 8 0
sysvmsgpl 40 5 0 2 1 0 1 1 0 8 0
semapl 112 85 0 75 1 0 1 1 0 8 0
shmpl 112 16 0 2 1 0 1 1 0 8 0
dirhash 1024 21 0 4 3 0 3 3 0 8 0
dino2pl 256 1917 0 391 96 0 96 96 0 8 0
ffsino 296 1917 0 391 118 0 118 118 0 8 0
nchpl 144 2408 0 711 64 0 64 64 0 8 0
vnodes 216 2142 0 0 119 0 119 119 0 8 0
namei 1024 7608 0 7608 1 0 1 1 0 8 1
percpumem 16 49 0 1 1 0 1 1 0 8 0
kstatmem 264 24 0 2 2 0 2 2 0 8 0
scxspl 216 8196 0 8196 5 4 1 4 1 8 1
plimitpl 152 106 0 84 2 1 1 2 0 8 0
sigapl 424 684 0 637 7 0 7 7 0 8 0
knotepl 120 522 0 0 16 0 16 16 0 8 0
kqueuepl 224 120 0 111 3 0 3 3 0 8 2
pipepl 344 195 0 168 3 0 3 3 0 8 0
fdescpl 528 668 0 637 4 1 3 4 0 8 0
filepl 160 3071 0 2878 11 0 11 11 0 8 2
lockfpl 104 59 0 57 1 0 1 1 0 8 0
lockfspl 48 20 0 18 1 0 1 1 0 8 0
sessionpl 144 39 0 24 1 0 1 1 0 8 0
pgrppl 48 72 0 49 1 0 1 1 0 8 0
ucredpl 104 369 0 351 1 0 1 1 0 8 0
zombiepl 144 638 0 637 1 0 1 1 0 8 0
processpl 1232 684 0 637 5 0 5 5 0 8 0
procpl 664 1080 0 1027 7 1 6 7 0 8 1
sosppl 176 3 0 3 2 1 1 1 0 8 1
sockpl 752 581 0 555 8 1 7 7 0 8 4
mcl64k 65536 4 0 0 1 0 1 1 0 8 0
mcl16k 16384 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 4 0 0 1 0 1 1 0 8 0
mcl4k 4096 110 0 0 14 0 14 14 0 8 0
mcl2k 2048 21 0 0 3 0 3 3 0 8 0
mtagpl 96 2 0 0 1 0 1 1 0 8 0
mbufpl 256 249 0 0 16 0 16 16 0 8 0
bufpl 280 2734 0 118 187 0 187 187 0 8 0
anonpl 32 8652 0 0 70 0 70 70 0 246 0
amapchunkpl 152 15665 0 15229 30 5 25 30 0 158 1
amappl16 200 2853 0 2804 24 8 16 16 0 8 11
amappl15 192 8 0 8 1 1 0 1 0 8 0
amappl14 184 9 0 9 1 1 0 1 0 8 0
amappl13 176 427 0 426 1 0 1 1 0 8 0
amappl12 168 1003 0 964 3 0 3 3 0 8 0
amappl11 160 28 0 28 1 1 0 1 0 8 0
amappl10 152 43 0 33 1 0 1 1 0 8 0
amappl9 144 243 0 243 1 1 0 1 0 8 0
amappl8 136 40 0 37 1 0 1 1 0 8 0
amappl7 128 78 0 76 1 0 1 1 0 8 0
amappl6 120 275 0 264 1 0 1 1 0 8 0
amappl5 112 79 0 72 1 0 1 1 0 8 0
amappl4 104 369 0 344 1 0 1 1 0 8 0
amappl3 96 2579 0 2512 3 0 3 3 0 8 0
amappl2 88 787 0 718 2 0 2 2 0 8 0
amappl1 80 10327 0 9788 14 0 14 14 0 8 0
amappl 88 4397 0 4262 5 0 5 5 0 92 0
uvmvnodes 80 2142 0 0 44 0 44 44 0 8 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma1024 1024 1 0 0 1 0 1 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 72 18 0 2 1 0 1 1 0 8 0
uaddrrnd 24 668 0 637 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 668 0 637 1 0 1 1 0 8 0
vmmpekpl 168 7303 0 7266 3 0 3 3 0 8 0
vmmpepl 168 51067 0 49311 101 7 94 101 0 357 1
vmsppl 488 667 0 637 7 2 5 6 0 8 0
rwobjpl 80 18994 0 16036 65 0 65 65 0 8 2
pdppl 4096 1344 0 1274 124 40 84 98 0 8 14
pvpl 32 15068 0 0 122 0 122 122 0 265 0
pmappl 256 667 0 637 4 1 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 304 0 47 8 0 8 8 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff83354579) at panic+0x1e5 sys/kern/subr_prf.c:198
mtx_enter_try(ffffffff83939f50) at mtx_enter_try+0x1da
mtx_enter(ffffffff83939f50) at mtx_enter+0x62 sys/kern/kern_lock.c:261
witness_checkorder(ffff80000002ca60,9,0) at witness_checkorder+0x6ea sys/kern/subr_witness.c:903
mtx_enter(ffff80000002ca50) at mtx_enter+0x4a sys/kern/kern_lock.c:260
ioapic_hwmask(ffff80000002ca00,9) at ioapic_hwmask+0x83 sys/arch/amd64/amd64/ioapic.c:473
Xintr_ioapic_level9_untramp() at Xintr_ioapic_level9_untramp+0x22c
itismychild(fffffd8003f27300,fffffd8003f29e40) at itismychild+0x42d adopt sys/kern/subr_witness.c:1594 [inline]
itismychild(fffffd8003f27300,fffffd8003f29e40) at itismychild+0x42d sys/kern/subr_witness.c:1656
witness_checkorder(ffffffff837b7e08,9,0) at witness_checkorder+0x118e sys/kern/subr_witness.c:1095
mtx_enter(ffffffff837b7df8) at mtx_enter+0x4a sys/kern/kern_lock.c:260
clockintr_cancel(ffffffff837b72f8) at clockintr_cancel+0x2f sys/kern/kern_clockintr.c:323
mi_switch() at mi_switch+0x16f sys/kern/sched_bsd.c:376
sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:367
sys_futex(ffff80002f3c9248,ffff80002a3badc0,ffff80002a3bad10) at sys_futex+0xb90 futex_wait sys/kern/sys_futex.c:306 [inline]
sys_futex(ffff80002f3c9248,ffff80002a3badc0,ffff80002a3bad10) at sys_futex+0xb90 sys/kern/sys_futex.c:155
syscall(ffff80002a3badc0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a3badc0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:765
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x9bdcae64890, count: -17
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffff8000299edff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
mtx_enter(ffffffff838ad2e8) at mtx_enter+0xd2 sys/kern/kern_lock.c:264
wakeup_n(ffffffff8390c180,ffffffff) at wakeup_n+0x54 sys/kern/kern_synch.c:579
uvm_pmr_freepageq(ffff80002a2449b8) at uvm_pmr_freepageq+0x3b6 sys/uvm/uvm_pmemrange.c:1389
km_free(ffff8000357eb000,6000,ffffffff835ca008,ffffffff834434e8) at km_free+0x36b sys/uvm/uvm_km.c:827
uvm_uarea_free(ffff8000fffef240) at uvm_uarea_free+0x4f sys/uvm/uvm_glue.c:304
reaper(ffff8000ffffdc90) at reaper+0x1aa sys/kern/kern_exit.c:493
end trace frame: 0x0, count: 6
ddb{1}> trace
x86_ipi_db(ffff8000299edff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
mtx_enter(ffffffff838ad2e8) at mtx_enter+0xd2 sys/kern/kern_lock.c:264
wakeup_n(ffffffff8390c180,ffffffff) at wakeup_n+0x54 sys/kern/kern_synch.c:579
uvm_pmr_freepageq(ffff80002a2449b8) at uvm_pmr_freepageq+0x3b6 sys/uvm/uvm_pmemrange.c:1389
km_free(ffff8000357eb000,6000,ffffffff835ca008,ffffffff834434e8) at km_free+0x36b sys/uvm/uvm_km.c:827
uvm_uarea_free(ffff8000fffef240) at uvm_uarea_free+0x4f sys/uvm/uvm_glue.c:304
reaper(ffff8000ffffdc90) at reaper+0x1aa sys/kern/kern_exit.c:493
end trace frame: 0x0, count: -9
---
This report 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 issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
Reply all
Reply to author
Forward
0 new messages