panic: curcpu->ci_proc_pmap didn't point to previous pmap (3)
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syzbot
Mar 24, 2026, 4:50:33 AM (2 days ago) Mar 24
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 2084961b940b refereced -> referenced; ok bluhm@
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=17b7c1d6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=1bc15e68cd2a49e5
dashboard link: https://syzkaller.appspot.com/bug?extid=335ebcbb24ea5c264653
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e850e0447a2d/disk-2084961b.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/9e4ed024e78b/bsd-2084961b.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7a26856115a0/kernel-2084961b.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+335ebc...@syzkaller.appspotmail.com
panic: curcpu->ci_proc_pmap didn't point to previous pmap
Stopped at db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*518805 62754 0 0x10000002 0x1 0 syz-executor
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff837ea16d) at panic+0x1cf sys/kern/subr_prf.c:198
switch_restored() at switch_restored+0x3f
sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2ce sys/kern/kern_synch.c:369
rw_do_enter_write(fffffd806ec4f988,1) at rw_do_enter_write+0x13c sys/kern/kern_rwlock.c:298
rrw_enter(fffffd806ec4f988,1) at rrw_enter+0xa3 sys/kern/kern_rwlock.c:621
VOP_LOCK(fffffd8065bd73a8,2001) at VOP_LOCK+0xbf sys/kern/vfs_vops.c:527
vn_lock(fffffd8065bd73a8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vget(fffffd8065bd73a8,2001) at vget+0x2a2 sys/kern/vfs_subr.c:686
ktrwriteraw(ffff80002a776010,fffffd8065bd73a8,fffffd8007ffd750,ffff80002a7ff6d0,ffff80002a7ff6b0) at ktrwriteraw+0x152 sys/kern/kern_ktrace.c:688
ktrpsig(ffff80002a776010,14,9b82719b900,0,0,ffff80002a7ff7a0) at ktrpsig+0x1af ktrwrite sys/kern/kern_ktrace.c:-1 [inline]
ktrpsig(ffff80002a776010,14,9b82719b900,0,0,ffff80002a7ff7a0) at ktrpsig+0x1af sys/kern/kern_ktrace.c:298
postsig(ffff80002a776010,14,ffff80002a7ff8a8) at postsig+0x3bb sys/kern/kern_sig.c:1759
userret(ffff80002a776010) at userret+0x23e sys/kern/kern_sig.c:2207
syscall(ffff80002a7ff9d0) at syscall+0xa56 mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff80002a7ff9d0) at syscall+0xa56 sys/arch/amd64/amd64/trap.c:804
end trace frame: 0xffff80002a7ffa50, 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>
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
*cpu0: curcpu->ci_proc_pmap didn't point to previous pmap
ddb> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff837ea16d) at panic+0x1cf sys/kern/subr_prf.c:198
switch_restored() at switch_restored+0x3f
sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2ce sys/kern/kern_synch.c:369
rw_do_enter_write(fffffd806ec4f988,1) at rw_do_enter_write+0x13c sys/kern/kern_rwlock.c:298
rrw_enter(fffffd806ec4f988,1) at rrw_enter+0xa3 sys/kern/kern_rwlock.c:621
VOP_LOCK(fffffd8065bd73a8,2001) at VOP_LOCK+0xbf sys/kern/vfs_vops.c:527
vn_lock(fffffd8065bd73a8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vget(fffffd8065bd73a8,2001) at vget+0x2a2 sys/kern/vfs_subr.c:686
ktrwriteraw(ffff80002a776010,fffffd8065bd73a8,fffffd8007ffd750,ffff80002a7ff6d0,ffff80002a7ff6b0) at ktrwriteraw+0x152 sys/kern/kern_ktrace.c:688
ktrpsig(ffff80002a776010,14,9b82719b900,0,0,ffff80002a7ff7a0) at ktrpsig+0x1af ktrwrite sys/kern/kern_ktrace.c:-1 [inline]
ktrpsig(ffff80002a776010,14,9b82719b900,0,0,ffff80002a7ff7a0) at ktrpsig+0x1af sys/kern/kern_ktrace.c:298
postsig(ffff80002a776010,14,ffff80002a7ff8a8) at postsig+0x3bb sys/kern/kern_sig.c:1759
userret(ffff80002a776010) at userret+0x23e sys/kern/kern_sig.c:2207
syscall(ffff80002a7ff9d0) at syscall+0xa56 mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff80002a7ff9d0) at syscall+0xa56 sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7ab6385a5f10, count: -15
ddb> show registers
rdi 0
rsi 0x1
rbp 0xffff80002a7ff1b8
rbx 0xfffffd807ece5000
rdx 0
rcx 0
rax 0xffff80002a776010
r8 0x101010101010101
r9 0x8080808080808080
r10 0x67dc852101885e9a
r11 0xfc99911a8dacab9c
r12 0
r13 0xffff80002a7fa000
r14 0
r15 0x1
rip 0xffffffff8163de25 db_enter+0x25
cs 0x8
rflags 0x46
rsp 0xffff80002a7ff1a8
ss 0x10
db_enter+0x25: addq $0x8,%rsp
ddb> show proc
PROC (syz-executor) tid=518805 pid=62754 tcnt=1 stat=onproc
flags process=10000002<EXEC,WAITEVENT> proc=1<INKTR>
runpri=32, usrpri=62, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80002a776a70,0xffff80002a7774e0
process=0xffff80002a7ad210 user=0xffff80002a7fa000, vmspace=0xfffffd807ece6e60
estcpu=12, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
21222 455443 42199 0 2 0 syz-executor
21222 419718 42199 0 3 0x4000000 bqwait syz-executor
21222 285047 42199 0 3 0x4000080 fsleep syz-executor
21222 499786 42199 0 3 0x4000080 fsleep syz-executor
41751 79506 73419 0 3 0x80 nanoslp syz-executor
41751 351134 73419 0 3 0x4000080 kqsel syz-executor
41751 421649 73419 0 3 0x4000080 fsleep syz-executor
41751 523910 73419 0 3 0x4000080 fsleep syz-executor
7263 386939 22338 -1 3 0x90 nanoslp syz-executor
7263 500060 22338 -1 3 0x4000090 ttyout syz-executor
73419 340102 89317 0 3 0x82 nanoslp syz-executor
71586 333883 1 0 3 0x100083 ttyin getty
29901 426400 89317 0 3 0x82 nanoslp syz-executor
42199 222545 89317 0 2 0x2 syz-executor
85007 4733 89317 0 3 0x82 wait syz-executor
47748 238943 89317 0 3 0x82 wait syz-executor
55590 238313 89317 0 3 0x82 wait syz-executor
*62754 518805 89317 0 7 0x10000003 syz-executor
22338 473768 89317 0 3 0x82 nanoslp syz-executor
89317 235105 5958 0 3 0x82 kqread syz-executor
5958 303484 28416 0 3 0x10008a sigsusp ksh
28416 242484 85773 0 3 0x98 kqread sshd-session
85773 376453 72694 0 3 0x92 kqread sshd-session
72694 245994 1 0 3 0x88 kqread sshd
2737 45130 11327 73 3 0x1100090 kqread syslogd
11327 477949 1 0 3 0x100082 sbwait syslogd
52177 448665 1 0 3 0x100080 kqread resolvd
99282 374490 52503 77 3 0x100092 kqread dhcpleased
58227 415211 52503 77 3 0x100092 kqread dhcpleased
52503 402836 1 0 3 0x80 kqread dhcpleased
44783 127958 0 0 3 0x14200 bored smr
55368 105886 0 0 2 0x14200 zerothread
62434 480936 0 0 3 0x14200 aiodoned aiodoned
13508 178606 0 0 3 0x14200 syncer update
59412 421798 0 0 3 0x14200 cleaner cleaner
4034 268949 0 0 3 0x14200 reaper reaper
10192 227784 0 0 3 0x14200 pgdaemon pagedaemon
59946 336801 0 0 3 0x14200 bored viomb
11412 102400 0 0 3 0x40014200 acpi0 acpi0
80461 412686 0 0 3 0x14200 bored softnet0
88408 443121 0 0 3 0x14200 bored systqmp
74758 74433 0 0 3 0x14200 bored systq
64228 502262 0 0 3 0x40014200 tmoslp softclock
43468 9909 0 0 3 0x40014200 idle0
1 399638 0 0 3 0x80082 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb> show all locks
No such command
ddb> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11069 12171K 12562K 166960K 12969 0
pcb 17 18K 19K 166960K 217 0
rtable 224 8K 8K 166960K 496 0
pf 34 13K 17K 166960K 90 0
ifaddr 40 6K 7K 166960K 66 0
ifgroup 54 2K 2K 166960K 85 0
sysctl 4 1K 9K 166960K 10 0
counters 34 17K 18K 166960K 55 0
ioctlops 0 0K 4K 166960K 378 0
iov 0 0K 24K 166960K 150 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1300 82K 82K 166960K 1797 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 9K 166960K 10 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 0K 166960K 94 0
dirhash 12 2K 2K 166960K 18 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 17 61K 85K 166960K 574 0
sigio 0 0K 0K 166960K 3 0
proc 60 59K 100K 166960K 572 0
subproc 72 4K 4K 166960K 81 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 1 0K 0K 166960K 43 0
in_multi 88 6K 7K 166960K 128 0
ether_multi 1 0K 0K 166960K 5 0
mrt 0 0K 0K 166960K 21 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 223 996K 996K 166960K 223 0
exec 0 0K 1K 166960K 523 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 229 159K 187K 166960K 6800 0
UVM aobj 14 10K 10K 166960K 15 0
pinsyscall 38 76K 90K 166960K 1685 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 1 0K 0K 166960K 32 0
NDP 12 0K 1K 166960K 43 0
temp 50 9069K 9133K 166960K 13161 0
kqueue 13 20K 28K 166960K 114 0
SYN cache 2 16K 16K 166960K 2 0
ddb> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
rtpcb 120 101 0 98 2 0 2 2 0 8 1
rtentry 136 137 0 44 4 0 4 4 0 8 0
unpcb 144 601 0 586 6 0 6 6 0 8 5
syncache 336 3 0 3 1 0 1 1 0 8 1
tcpcb 736 416 0 412 13 4 9 13 0 8 8
arp 96 21 0 5 1 0 1 1 0 8 0
ipq 40 2 0 0 1 0 1 1 0 8 0
ipqe 40 5 0 2 1 0 1 1 0 8 0
inpcb 328 1060 0 1051 12 3 9 12 0 8 8
nd6 112 33 0 9 1 0 1 1 0 8 0
pkpcb 40 1 0 1 1 0 1 1 0 8 1
kcovpl 48 9 0 1 1 0 1 1 0 8 0
mppekey 1024 1 0 1 1 0 1 1 0 8 1
ppxss 1072 19 0 19 1 0 1 1 0 8 1
pppxif 1416 1 0 1 1 0 1 1 0 8 1
pfstscr 40 1 0 1 1 0 1 1 0 8 1
pfrktable 1344 2 0 2 1 0 1 1 0 8 1
pfanchor 1288 3 0 3 1 0 1 1 0 8 1
pftag 88 2 0 2 1 0 1 1 0 8 1
pfstitem 24 2 0 0 1 0 1 1 0 8 0
pfstkey 128 4 0 2 1 0 1 1 0 8 0
pfstate 384 2 0 1 1 0 1 1 0 8 0
pfrule 1360 10 0 9 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 614 0 195 31 0 31 31 0 8 4
art_table 40 615 0 195 5 0 5 5 0 8 0
art_node 32 137 0 54 1 0 1 1 0 8 0
sysvmsgpl 40 4 0 3 1 0 1 1 0 8 0
semupl 112 1 0 1 1 0 1 1 0 8 1
semapl 112 91 0 81 1 0 1 1 0 8 0
shmpl 112 7 0 0 1 0 1 1 0 8 0
dirhash 1024 21 0 4 3 0 3 3 0 8 0
dino2pl 256 2453 0 1000 92 0 92 92 0 8 0
ffsino 256 2453 0 1000 92 0 92 92 0 8 0
nchpl 144 3276 0 1583 64 0 64 64 0 8 0
rtmask 32 4 0 4 1 0 1 1 0 8 1
vnodes 216 2751 0 0 153 0 153 153 0 8 0
namei 1024 11526 0 11526 2 0 2 2 0 8 2
vcpupl 3904 5 0 1 1 0 1 1 0 8 0
vmpool 808 5 0 1 1 0 1 1 0 8 0
kstatmem 264 50 0 26 2 0 2 2 0 8 0
scsiplug 72 4 0 4 1 0 1 1 0 8 1
scxspl 216 17354 0 17226 8 0 8 8 1 8 0
plimitpl 152 245 0 228 1 0 1 1 0 8 0
sigapl 424 863 0 820 6 0 6 6 0 8 1
knotepl 120 29608 0 29561 12 2 10 12 0 8 7
kqueuepl 184 233 0 222 1 0 1 1 0 8 0
pipepl 304 153 0 126 3 0 3 3 0 8 0
fdescpl 448 850 0 821 4 0 4 4 0 8 0
filepl 120 6222 0 6002 14 0 14 14 0 8 5
lockfpl 104 269 0 267 1 0 1 1 0 8 0
lockfspl 48 103 0 101 1 0 1 1 0 8 0
sessionpl 144 23 0 15 1 0 1 1 0 8 0
pgrppl 48 46 0 30 1 0 1 1 0 8 0
ucredpl 104 837 0 825 1 0 1 1 0 8 0
zombiepl 144 825 0 820 1 0 1 1 0 8 0
processpl 1152 863 0 820 4 0 4 4 0 8 0
procpl 664 1576 0 1526 6 0 6 6 0 8 1
sosppl 176 1 0 1 1 0 1 1 0 8 1
sockpl 552 1778 0 1751 18 8 10 16 0 8 8
mcl64k 65536 86 0 86 1 0 1 1 0 8 1
mcl16k 16384 1 0 1 1 0 1 1 0 8 1
mcl12k 12288 2 0 2 1 0 1 1 0 8 1
mcl9k 9216 1 0 1 1 0 1 1 0 8 1
mcl8k 8192 8 0 8 1 0 1 1 0 8 1
mcl4k 4096 3028 0 2973 16 1 15 16 0 8 7
mcl2k 2048 648 0 648 2 0 2 2 0 8 2
mtagpl 96 124 0 11 3 0 3 3 0 8 0
mbufpl 256 9893 0 9612 19 0 19 19 0 8 0
bufpl 280 6774 0 560 444 0 444 444 0 8 0
anonpl 24 153428 0 150255 65 0 65 65 0 187 31
amapchunkpl 152 22352 0 21865 36 0 36 36 0 158 11
amappl16 200 3366 0 3335 31 16 15 22 0 8 6
amappl15 192 54 0 53 1 0 1 1 0 8 0
amappl14 184 420 0 419 1 0 1 1 0 8 0
amappl13 176 114 0 104 1 0 1 1 0 8 0
amappl12 168 1176 0 1148 2 0 2 2 0 8 0
amappl11 160 2 0 2 1 0 1 1 0 8 1
amappl10 152 57 0 47 1 0 1 1 0 8 0
amappl9 144 265 0 265 1 0 1 1 0 8 1
amappl8 136 107 0 106 1 0 1 1 0 8 0
amappl7 128 144 0 131 1 0 1 1 0 8 0
amappl6 120 159 0 158 1 0 1 1 0 8 0
amappl5 112 84 0 76 1 0 1 1 0 8 0
amappl4 104 289 0 272 1 0 1 1 0 8 0
amappl3 96 4255 0 4146 4 0 4 4 0 8 0
amappl2 88 513 0 460 2 0 2 2 0 8 0
amappl1 80 10852 0 10302 13 0 13 13 0 8 1
amappl 88 6024 0 5858 5 0 5 5 0 92 0
uvmvnodes 80 113 0 0 3 0 3 3 0 8 0
dma4096 4096 1 0 1 1 0 1 1 0 8 1
dma1024 1024 1 0 0 1 0 1 1 0 8 0
dma512 512 1 0 1 1 0 1 1 0 8 1
dma256 256 6 0 6 1 0 1 1 0 8 1
dma128 128 254 0 254 1 0 1 1 0 8 1
dma64 64 6 0 6 1 0 1 1 0 8 1
dma32 32 7 0 7 1 0 1 1 0 8 1
dma16 16 18 0 17 1 0 1 1 0 8 0
aobjpl 72 14 0 1 1 0 1 1 0 8 0
uaddrrnd 24 850 0 821 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 850 0 821 1 0 1 1 0 8 0
vmmpekpl 168 8216 0 8175 3 0 3 3 0 8 0
vmmpepl 168 61076 0 59281 98 0 98 98 0 357 12
vmsppl 368 849 0 821 4 0 4 4 0 8 1
rwobjpl 40 19305 0 18323 14 0 14 14 0 8 0
pdppl 4096 1716 0 1648 96 25 71 76 0 8 3
pvpl 32 397883 0 388440 141 0 141 141 0 265 43
pmappl 216 854 0 822 2 0 2 2 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 386 0 30 11 0 11 11 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff837ea16d) at panic+0x1cf sys/kern/subr_prf.c:198
switch_restored() at switch_restored+0x3f
sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2ce sys/kern/kern_synch.c:369
rw_do_enter_write(fffffd806ec4f988,1) at rw_do_enter_write+0x13c sys/kern/kern_rwlock.c:298
rrw_enter(fffffd806ec4f988,1) at rrw_enter+0xa3 sys/kern/kern_rwlock.c:621
VOP_LOCK(fffffd8065bd73a8,2001) at VOP_LOCK+0xbf sys/kern/vfs_vops.c:527
vn_lock(fffffd8065bd73a8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vget(fffffd8065bd73a8,2001) at vget+0x2a2 sys/kern/vfs_subr.c:686
ktrwriteraw(ffff80002a776010,fffffd8065bd73a8,fffffd8007ffd750,ffff80002a7ff6d0,ffff80002a7ff6b0) at ktrwriteraw+0x152 sys/kern/kern_ktrace.c:688
ktrpsig(ffff80002a776010,14,9b82719b900,0,0,ffff80002a7ff7a0) at ktrpsig+0x1af ktrwrite sys/kern/kern_ktrace.c:-1 [inline]
ktrpsig(ffff80002a776010,14,9b82719b900,0,0,ffff80002a7ff7a0) at ktrpsig+0x1af sys/kern/kern_ktrace.c:298
postsig(ffff80002a776010,14,ffff80002a7ff8a8) at postsig+0x3bb sys/kern/kern_sig.c:1759
userret(ffff80002a776010) at userret+0x23e sys/kern/kern_sig.c:2207
syscall(ffff80002a7ff9d0) at syscall+0xa56 mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff80002a7ff9d0) at syscall+0xa56 sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7ab6385a5f10, count: -15
ddb> machine ddbcpu 1
No such command
ddb> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff837ea16d) at panic+0x1cf sys/kern/subr_prf.c:198
switch_restored() at switch_restored+0x3f
sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2ce sys/kern/kern_synch.c:369
rw_do_enter_write(fffffd806ec4f988,1) at rw_do_enter_write+0x13c sys/kern/kern_rwlock.c:298
rrw_enter(fffffd806ec4f988,1) at rrw_enter+0xa3 sys/kern/kern_rwlock.c:621
VOP_LOCK(fffffd8065bd73a8,2001) at VOP_LOCK+0xbf sys/kern/vfs_vops.c:527
vn_lock(fffffd8065bd73a8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vget(fffffd8065bd73a8,2001) at vget+0x2a2 sys/kern/vfs_subr.c:686
ktrwriteraw(ffff80002a776010,fffffd8065bd73a8,fffffd8007ffd750,ffff80002a7ff6d0,ffff80002a7ff6b0) at ktrwriteraw+0x152 sys/kern/kern_ktrace.c:688
ktrpsig(ffff80002a776010,14,9b82719b900,0,0,ffff80002a7ff7a0) at ktrpsig+0x1af ktrwrite sys/kern/kern_ktrace.c:-1 [inline]
ktrpsig(ffff80002a776010,14,9b82719b900,0,0,ffff80002a7ff7a0) at ktrpsig+0x1af sys/kern/kern_ktrace.c:298
postsig(ffff80002a776010,14,ffff80002a7ff8a8) at postsig+0x3bb sys/kern/kern_sig.c:1759
userret(ffff80002a776010) at userret+0x23e sys/kern/kern_sig.c:2207
syscall(ffff80002a7ff9d0) at syscall+0xa56 mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff80002a7ff9d0) at syscall+0xa56 sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7ab6385a5f10, count: -15
---
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syzbot found the following issue on:
HEAD commit: 2084961b940b refereced -> referenced; ok bluhm@
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=17b7c1d6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=1bc15e68cd2a49e5
dashboard link: https://syzkaller.appspot.com/bug?extid=335ebcbb24ea5c264653
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e850e0447a2d/disk-2084961b.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/9e4ed024e78b/bsd-2084961b.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7a26856115a0/kernel-2084961b.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+335ebc...@syzkaller.appspotmail.com
panic: curcpu->ci_proc_pmap didn't point to previous pmap
Stopped at db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*518805 62754 0 0x10000002 0x1 0 syz-executor
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff837ea16d) at panic+0x1cf sys/kern/subr_prf.c:198
switch_restored() at switch_restored+0x3f
sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2ce sys/kern/kern_synch.c:369
rw_do_enter_write(fffffd806ec4f988,1) at rw_do_enter_write+0x13c sys/kern/kern_rwlock.c:298
rrw_enter(fffffd806ec4f988,1) at rrw_enter+0xa3 sys/kern/kern_rwlock.c:621
VOP_LOCK(fffffd8065bd73a8,2001) at VOP_LOCK+0xbf sys/kern/vfs_vops.c:527
vn_lock(fffffd8065bd73a8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vget(fffffd8065bd73a8,2001) at vget+0x2a2 sys/kern/vfs_subr.c:686
ktrwriteraw(ffff80002a776010,fffffd8065bd73a8,fffffd8007ffd750,ffff80002a7ff6d0,ffff80002a7ff6b0) at ktrwriteraw+0x152 sys/kern/kern_ktrace.c:688
ktrpsig(ffff80002a776010,14,9b82719b900,0,0,ffff80002a7ff7a0) at ktrpsig+0x1af ktrwrite sys/kern/kern_ktrace.c:-1 [inline]
ktrpsig(ffff80002a776010,14,9b82719b900,0,0,ffff80002a7ff7a0) at ktrpsig+0x1af sys/kern/kern_ktrace.c:298
postsig(ffff80002a776010,14,ffff80002a7ff8a8) at postsig+0x3bb sys/kern/kern_sig.c:1759
userret(ffff80002a776010) at userret+0x23e sys/kern/kern_sig.c:2207
syscall(ffff80002a7ff9d0) at syscall+0xa56 mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff80002a7ff9d0) at syscall+0xa56 sys/arch/amd64/amd64/trap.c:804
end trace frame: 0xffff80002a7ffa50, 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>
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
*cpu0: curcpu->ci_proc_pmap didn't point to previous pmap
ddb> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff837ea16d) at panic+0x1cf sys/kern/subr_prf.c:198
switch_restored() at switch_restored+0x3f
sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2ce sys/kern/kern_synch.c:369
rw_do_enter_write(fffffd806ec4f988,1) at rw_do_enter_write+0x13c sys/kern/kern_rwlock.c:298
rrw_enter(fffffd806ec4f988,1) at rrw_enter+0xa3 sys/kern/kern_rwlock.c:621
VOP_LOCK(fffffd8065bd73a8,2001) at VOP_LOCK+0xbf sys/kern/vfs_vops.c:527
vn_lock(fffffd8065bd73a8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vget(fffffd8065bd73a8,2001) at vget+0x2a2 sys/kern/vfs_subr.c:686
ktrwriteraw(ffff80002a776010,fffffd8065bd73a8,fffffd8007ffd750,ffff80002a7ff6d0,ffff80002a7ff6b0) at ktrwriteraw+0x152 sys/kern/kern_ktrace.c:688
ktrpsig(ffff80002a776010,14,9b82719b900,0,0,ffff80002a7ff7a0) at ktrpsig+0x1af ktrwrite sys/kern/kern_ktrace.c:-1 [inline]
ktrpsig(ffff80002a776010,14,9b82719b900,0,0,ffff80002a7ff7a0) at ktrpsig+0x1af sys/kern/kern_ktrace.c:298
postsig(ffff80002a776010,14,ffff80002a7ff8a8) at postsig+0x3bb sys/kern/kern_sig.c:1759
userret(ffff80002a776010) at userret+0x23e sys/kern/kern_sig.c:2207
syscall(ffff80002a7ff9d0) at syscall+0xa56 mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff80002a7ff9d0) at syscall+0xa56 sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7ab6385a5f10, count: -15
ddb> show registers
rdi 0
rsi 0x1
rbp 0xffff80002a7ff1b8
rbx 0xfffffd807ece5000
rdx 0
rcx 0
rax 0xffff80002a776010
r8 0x101010101010101
r9 0x8080808080808080
r10 0x67dc852101885e9a
r11 0xfc99911a8dacab9c
r12 0
r13 0xffff80002a7fa000
r14 0
r15 0x1
rip 0xffffffff8163de25 db_enter+0x25
cs 0x8
rflags 0x46
rsp 0xffff80002a7ff1a8
ss 0x10
db_enter+0x25: addq $0x8,%rsp
ddb> show proc
PROC (syz-executor) tid=518805 pid=62754 tcnt=1 stat=onproc
flags process=10000002<EXEC,WAITEVENT> proc=1<INKTR>
runpri=32, usrpri=62, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80002a776a70,0xffff80002a7774e0
process=0xffff80002a7ad210 user=0xffff80002a7fa000, vmspace=0xfffffd807ece6e60
estcpu=12, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
21222 455443 42199 0 2 0 syz-executor
21222 419718 42199 0 3 0x4000000 bqwait syz-executor
21222 285047 42199 0 3 0x4000080 fsleep syz-executor
21222 499786 42199 0 3 0x4000080 fsleep syz-executor
41751 79506 73419 0 3 0x80 nanoslp syz-executor
41751 351134 73419 0 3 0x4000080 kqsel syz-executor
41751 421649 73419 0 3 0x4000080 fsleep syz-executor
41751 523910 73419 0 3 0x4000080 fsleep syz-executor
7263 386939 22338 -1 3 0x90 nanoslp syz-executor
7263 500060 22338 -1 3 0x4000090 ttyout syz-executor
73419 340102 89317 0 3 0x82 nanoslp syz-executor
71586 333883 1 0 3 0x100083 ttyin getty
29901 426400 89317 0 3 0x82 nanoslp syz-executor
42199 222545 89317 0 2 0x2 syz-executor
85007 4733 89317 0 3 0x82 wait syz-executor
47748 238943 89317 0 3 0x82 wait syz-executor
55590 238313 89317 0 3 0x82 wait syz-executor
*62754 518805 89317 0 7 0x10000003 syz-executor
22338 473768 89317 0 3 0x82 nanoslp syz-executor
89317 235105 5958 0 3 0x82 kqread syz-executor
5958 303484 28416 0 3 0x10008a sigsusp ksh
28416 242484 85773 0 3 0x98 kqread sshd-session
85773 376453 72694 0 3 0x92 kqread sshd-session
72694 245994 1 0 3 0x88 kqread sshd
2737 45130 11327 73 3 0x1100090 kqread syslogd
11327 477949 1 0 3 0x100082 sbwait syslogd
52177 448665 1 0 3 0x100080 kqread resolvd
99282 374490 52503 77 3 0x100092 kqread dhcpleased
58227 415211 52503 77 3 0x100092 kqread dhcpleased
52503 402836 1 0 3 0x80 kqread dhcpleased
44783 127958 0 0 3 0x14200 bored smr
55368 105886 0 0 2 0x14200 zerothread
62434 480936 0 0 3 0x14200 aiodoned aiodoned
13508 178606 0 0 3 0x14200 syncer update
59412 421798 0 0 3 0x14200 cleaner cleaner
4034 268949 0 0 3 0x14200 reaper reaper
10192 227784 0 0 3 0x14200 pgdaemon pagedaemon
59946 336801 0 0 3 0x14200 bored viomb
11412 102400 0 0 3 0x40014200 acpi0 acpi0
80461 412686 0 0 3 0x14200 bored softnet0
88408 443121 0 0 3 0x14200 bored systqmp
74758 74433 0 0 3 0x14200 bored systq
64228 502262 0 0 3 0x40014200 tmoslp softclock
43468 9909 0 0 3 0x40014200 idle0
1 399638 0 0 3 0x80082 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb> show all locks
No such command
ddb> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11069 12171K 12562K 166960K 12969 0
pcb 17 18K 19K 166960K 217 0
rtable 224 8K 8K 166960K 496 0
pf 34 13K 17K 166960K 90 0
ifaddr 40 6K 7K 166960K 66 0
ifgroup 54 2K 2K 166960K 85 0
sysctl 4 1K 9K 166960K 10 0
counters 34 17K 18K 166960K 55 0
ioctlops 0 0K 4K 166960K 378 0
iov 0 0K 24K 166960K 150 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1300 82K 82K 166960K 1797 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 9K 166960K 10 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 0K 166960K 94 0
dirhash 12 2K 2K 166960K 18 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 17 61K 85K 166960K 574 0
sigio 0 0K 0K 166960K 3 0
proc 60 59K 100K 166960K 572 0
subproc 72 4K 4K 166960K 81 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 1 0K 0K 166960K 43 0
in_multi 88 6K 7K 166960K 128 0
ether_multi 1 0K 0K 166960K 5 0
mrt 0 0K 0K 166960K 21 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 223 996K 996K 166960K 223 0
exec 0 0K 1K 166960K 523 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 229 159K 187K 166960K 6800 0
UVM aobj 14 10K 10K 166960K 15 0
pinsyscall 38 76K 90K 166960K 1685 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 1 0K 0K 166960K 32 0
NDP 12 0K 1K 166960K 43 0
temp 50 9069K 9133K 166960K 13161 0
kqueue 13 20K 28K 166960K 114 0
SYN cache 2 16K 16K 166960K 2 0
ddb> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
rtpcb 120 101 0 98 2 0 2 2 0 8 1
rtentry 136 137 0 44 4 0 4 4 0 8 0
unpcb 144 601 0 586 6 0 6 6 0 8 5
syncache 336 3 0 3 1 0 1 1 0 8 1
tcpcb 736 416 0 412 13 4 9 13 0 8 8
arp 96 21 0 5 1 0 1 1 0 8 0
ipq 40 2 0 0 1 0 1 1 0 8 0
ipqe 40 5 0 2 1 0 1 1 0 8 0
inpcb 328 1060 0 1051 12 3 9 12 0 8 8
nd6 112 33 0 9 1 0 1 1 0 8 0
pkpcb 40 1 0 1 1 0 1 1 0 8 1
kcovpl 48 9 0 1 1 0 1 1 0 8 0
mppekey 1024 1 0 1 1 0 1 1 0 8 1
ppxss 1072 19 0 19 1 0 1 1 0 8 1
pppxif 1416 1 0 1 1 0 1 1 0 8 1
pfstscr 40 1 0 1 1 0 1 1 0 8 1
pfrktable 1344 2 0 2 1 0 1 1 0 8 1
pfanchor 1288 3 0 3 1 0 1 1 0 8 1
pftag 88 2 0 2 1 0 1 1 0 8 1
pfstitem 24 2 0 0 1 0 1 1 0 8 0
pfstkey 128 4 0 2 1 0 1 1 0 8 0
pfstate 384 2 0 1 1 0 1 1 0 8 0
pfrule 1360 10 0 9 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 614 0 195 31 0 31 31 0 8 4
art_table 40 615 0 195 5 0 5 5 0 8 0
art_node 32 137 0 54 1 0 1 1 0 8 0
sysvmsgpl 40 4 0 3 1 0 1 1 0 8 0
semupl 112 1 0 1 1 0 1 1 0 8 1
semapl 112 91 0 81 1 0 1 1 0 8 0
shmpl 112 7 0 0 1 0 1 1 0 8 0
dirhash 1024 21 0 4 3 0 3 3 0 8 0
dino2pl 256 2453 0 1000 92 0 92 92 0 8 0
ffsino 256 2453 0 1000 92 0 92 92 0 8 0
nchpl 144 3276 0 1583 64 0 64 64 0 8 0
rtmask 32 4 0 4 1 0 1 1 0 8 1
vnodes 216 2751 0 0 153 0 153 153 0 8 0
namei 1024 11526 0 11526 2 0 2 2 0 8 2
vcpupl 3904 5 0 1 1 0 1 1 0 8 0
vmpool 808 5 0 1 1 0 1 1 0 8 0
kstatmem 264 50 0 26 2 0 2 2 0 8 0
scsiplug 72 4 0 4 1 0 1 1 0 8 1
scxspl 216 17354 0 17226 8 0 8 8 1 8 0
plimitpl 152 245 0 228 1 0 1 1 0 8 0
sigapl 424 863 0 820 6 0 6 6 0 8 1
knotepl 120 29608 0 29561 12 2 10 12 0 8 7
kqueuepl 184 233 0 222 1 0 1 1 0 8 0
pipepl 304 153 0 126 3 0 3 3 0 8 0
fdescpl 448 850 0 821 4 0 4 4 0 8 0
filepl 120 6222 0 6002 14 0 14 14 0 8 5
lockfpl 104 269 0 267 1 0 1 1 0 8 0
lockfspl 48 103 0 101 1 0 1 1 0 8 0
sessionpl 144 23 0 15 1 0 1 1 0 8 0
pgrppl 48 46 0 30 1 0 1 1 0 8 0
ucredpl 104 837 0 825 1 0 1 1 0 8 0
zombiepl 144 825 0 820 1 0 1 1 0 8 0
processpl 1152 863 0 820 4 0 4 4 0 8 0
procpl 664 1576 0 1526 6 0 6 6 0 8 1
sosppl 176 1 0 1 1 0 1 1 0 8 1
sockpl 552 1778 0 1751 18 8 10 16 0 8 8
mcl64k 65536 86 0 86 1 0 1 1 0 8 1
mcl16k 16384 1 0 1 1 0 1 1 0 8 1
mcl12k 12288 2 0 2 1 0 1 1 0 8 1
mcl9k 9216 1 0 1 1 0 1 1 0 8 1
mcl8k 8192 8 0 8 1 0 1 1 0 8 1
mcl4k 4096 3028 0 2973 16 1 15 16 0 8 7
mcl2k 2048 648 0 648 2 0 2 2 0 8 2
mtagpl 96 124 0 11 3 0 3 3 0 8 0
mbufpl 256 9893 0 9612 19 0 19 19 0 8 0
bufpl 280 6774 0 560 444 0 444 444 0 8 0
anonpl 24 153428 0 150255 65 0 65 65 0 187 31
amapchunkpl 152 22352 0 21865 36 0 36 36 0 158 11
amappl16 200 3366 0 3335 31 16 15 22 0 8 6
amappl15 192 54 0 53 1 0 1 1 0 8 0
amappl14 184 420 0 419 1 0 1 1 0 8 0
amappl13 176 114 0 104 1 0 1 1 0 8 0
amappl12 168 1176 0 1148 2 0 2 2 0 8 0
amappl11 160 2 0 2 1 0 1 1 0 8 1
amappl10 152 57 0 47 1 0 1 1 0 8 0
amappl9 144 265 0 265 1 0 1 1 0 8 1
amappl8 136 107 0 106 1 0 1 1 0 8 0
amappl7 128 144 0 131 1 0 1 1 0 8 0
amappl6 120 159 0 158 1 0 1 1 0 8 0
amappl5 112 84 0 76 1 0 1 1 0 8 0
amappl4 104 289 0 272 1 0 1 1 0 8 0
amappl3 96 4255 0 4146 4 0 4 4 0 8 0
amappl2 88 513 0 460 2 0 2 2 0 8 0
amappl1 80 10852 0 10302 13 0 13 13 0 8 1
amappl 88 6024 0 5858 5 0 5 5 0 92 0
uvmvnodes 80 113 0 0 3 0 3 3 0 8 0
dma4096 4096 1 0 1 1 0 1 1 0 8 1
dma1024 1024 1 0 0 1 0 1 1 0 8 0
dma512 512 1 0 1 1 0 1 1 0 8 1
dma256 256 6 0 6 1 0 1 1 0 8 1
dma128 128 254 0 254 1 0 1 1 0 8 1
dma64 64 6 0 6 1 0 1 1 0 8 1
dma32 32 7 0 7 1 0 1 1 0 8 1
dma16 16 18 0 17 1 0 1 1 0 8 0
aobjpl 72 14 0 1 1 0 1 1 0 8 0
uaddrrnd 24 850 0 821 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 850 0 821 1 0 1 1 0 8 0
vmmpekpl 168 8216 0 8175 3 0 3 3 0 8 0
vmmpepl 168 61076 0 59281 98 0 98 98 0 357 12
vmsppl 368 849 0 821 4 0 4 4 0 8 1
rwobjpl 40 19305 0 18323 14 0 14 14 0 8 0
pdppl 4096 1716 0 1648 96 25 71 76 0 8 3
pvpl 32 397883 0 388440 141 0 141 141 0 265 43
pmappl 216 854 0 822 2 0 2 2 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 386 0 30 11 0 11 11 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff837ea16d) at panic+0x1cf sys/kern/subr_prf.c:198
switch_restored() at switch_restored+0x3f
sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2ce sys/kern/kern_synch.c:369
rw_do_enter_write(fffffd806ec4f988,1) at rw_do_enter_write+0x13c sys/kern/kern_rwlock.c:298
rrw_enter(fffffd806ec4f988,1) at rrw_enter+0xa3 sys/kern/kern_rwlock.c:621
VOP_LOCK(fffffd8065bd73a8,2001) at VOP_LOCK+0xbf sys/kern/vfs_vops.c:527
vn_lock(fffffd8065bd73a8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vget(fffffd8065bd73a8,2001) at vget+0x2a2 sys/kern/vfs_subr.c:686
ktrwriteraw(ffff80002a776010,fffffd8065bd73a8,fffffd8007ffd750,ffff80002a7ff6d0,ffff80002a7ff6b0) at ktrwriteraw+0x152 sys/kern/kern_ktrace.c:688
ktrpsig(ffff80002a776010,14,9b82719b900,0,0,ffff80002a7ff7a0) at ktrpsig+0x1af ktrwrite sys/kern/kern_ktrace.c:-1 [inline]
ktrpsig(ffff80002a776010,14,9b82719b900,0,0,ffff80002a7ff7a0) at ktrpsig+0x1af sys/kern/kern_ktrace.c:298
postsig(ffff80002a776010,14,ffff80002a7ff8a8) at postsig+0x3bb sys/kern/kern_sig.c:1759
userret(ffff80002a776010) at userret+0x23e sys/kern/kern_sig.c:2207
syscall(ffff80002a7ff9d0) at syscall+0xa56 mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff80002a7ff9d0) at syscall+0xa56 sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7ab6385a5f10, count: -15
ddb> machine ddbcpu 1
No such command
ddb> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff837ea16d) at panic+0x1cf sys/kern/subr_prf.c:198
switch_restored() at switch_restored+0x3f
sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2ce sys/kern/kern_synch.c:369
rw_do_enter_write(fffffd806ec4f988,1) at rw_do_enter_write+0x13c sys/kern/kern_rwlock.c:298
rrw_enter(fffffd806ec4f988,1) at rrw_enter+0xa3 sys/kern/kern_rwlock.c:621
VOP_LOCK(fffffd8065bd73a8,2001) at VOP_LOCK+0xbf sys/kern/vfs_vops.c:527
vn_lock(fffffd8065bd73a8,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:570
vget(fffffd8065bd73a8,2001) at vget+0x2a2 sys/kern/vfs_subr.c:686
ktrwriteraw(ffff80002a776010,fffffd8065bd73a8,fffffd8007ffd750,ffff80002a7ff6d0,ffff80002a7ff6b0) at ktrwriteraw+0x152 sys/kern/kern_ktrace.c:688
ktrpsig(ffff80002a776010,14,9b82719b900,0,0,ffff80002a7ff7a0) at ktrpsig+0x1af ktrwrite sys/kern/kern_ktrace.c:-1 [inline]
ktrpsig(ffff80002a776010,14,9b82719b900,0,0,ffff80002a7ff7a0) at ktrpsig+0x1af sys/kern/kern_ktrace.c:298
postsig(ffff80002a776010,14,ffff80002a7ff8a8) at postsig+0x3bb sys/kern/kern_sig.c:1759
userret(ffff80002a776010) at userret+0x23e sys/kern/kern_sig.c:2207
syscall(ffff80002a7ff9d0) at syscall+0xa56 mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff80002a7ff9d0) at syscall+0xa56 sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7ab6385a5f10, count: -15
---
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