uvm_fault: kcov_remote_enter (5)
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syzbot
Mar 27, 2026, 2:03:24 AM (3 days ago) Mar 27
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 2f434a4256f3 Bump version to 9.1
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=13a84eda580000
kernel config: https://syzkaller.appspot.com/x/.config?x=1bc15e68cd2a49e5
dashboard link: https://syzkaller.appspot.com/bug?extid=c6fd56998e874294bc2f
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/064d43172290/disk-2f434a42.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/e1c14fbda677/bsd-2f434a42.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a8f7c9e8e2f6/kernel-2f434a42.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c6fd56...@syzkaller.appspotmail.com
uvm_fault(0xffffffff8397c948, 0xffff800029ef6000, 0, 2) -> e
kernel: page fault trap, code=2
Stopped at kcov_remote_enter+0x122: movq $0,0(%rcx)
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*304129 7955 0 0 0x4000000 0 syz-executor
kcov_remote_enter(0,ffff80002a7afa90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670
timeout_run(ffffffff838810b0,ffff80002a746d98) at timeout_run+0xdf sys/kern/kern_timeout.c:696
softclock_process_tick_timeout(ffff80002a746d98,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756
softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788
softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87
dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
writedisklabel(d02,ffffffff8243f5f0,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158
sdioctl(d02,84946467,ffff80000160a800,3,ffff8000380d9780) at sdioctl+0x959 sys/scsi/sd.c:921
VOP_IOCTL(fffffd8072571990,84946467,ffff80000160a800,3,fffffd8007ffd7b8,ffff8000380d9780) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264
vn_ioctl(fffffd8069eb46a8,84946467,ffff80000160a800,ffff8000380d9780) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531
sys_ioctl(ffff8000380d9780,ffff80003b4fdd90,ffff80003b4fdce0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1
syscall(ffff80003b4fdd90) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003b4fdd90) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x71f2053a190, count: 1
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: uvm_fault(0xffffffff8397c948, 0xffff800029ef6000, 0, 2) -> e
ddb> trace
kcov_remote_enter(0,ffff80002a7afa90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670
timeout_run(ffffffff838810b0,ffff80002a746d98) at timeout_run+0xdf sys/kern/kern_timeout.c:696
softclock_process_tick_timeout(ffff80002a746d98,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756
softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788
softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87
dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
writedisklabel(d02,ffffffff8243f5f0,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158
sdioctl(d02,84946467,ffff80000160a800,3,ffff8000380d9780) at sdioctl+0x959 sys/scsi/sd.c:921
VOP_IOCTL(fffffd8072571990,84946467,ffff80000160a800,3,fffffd8007ffd7b8,ffff8000380d9780) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264
vn_ioctl(fffffd8069eb46a8,84946467,ffff80000160a800,ffff8000380d9780) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531
sys_ioctl(ffff8000380d9780,ffff80003b4fdd90,ffff80003b4fdce0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1
syscall(ffff80003b4fdd90) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003b4fdd90) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x71f2053a190, count: -14
ddb> show registers
rdi 0xffffffff
rsi 0xffff800000c16c00
rbp 0xffff80003b4fd700
rbx 0xffff80002a7afa90
rdx 0xffff8000380d9780
rcx 0xffff800029ef6000
rax 0xfffffd806cd01c60
r8 0xffff80003b4fd888
r9 0
r10 0xfe595a91d78fc631
r11 0x23e76450fbb675f
r12 0xffffffff814aa960 endtsleep
r13 0xffff80002a746d00
r14 0xffff80002a7afa90
r15 0
rip 0xffffffff831cf702 kcov_remote_enter+0x122
cs 0x8
rflags 0x10297 __ALIGN_SIZE+0xf297
rsp 0xffff80003b4fd6e0
ss 0x10
kcov_remote_enter+0x122: movq $0,0(%rcx)
ddb> show proc
PROC (syz-executor) tid=304129 pid=7955 tcnt=2 stat=onproc
flags process=0 proc=4000000<THREAD>
runpri=32, usrpri=50, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80002a788fa0,0xffffffff8393ebf0
process=0xffff8000ffff8d98 user=0xffff80003b4f8000, vmspace=0xfffffd806bf04748
estcpu=20, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=1
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
7955 357439 20541 0 2 0 syz-executor
* 7955 304129 20541 0 7 0x4000000 syz-executor
99264 413802 12833 0 3 0x90 nanoslp syz-executor
99264 455873 12833 0 3 0x4000090 netacc syz-executor
99264 78773 12833 0 3 0x4000090 fsleep syz-executor
2220 320257 28667 0 3 0x3000 suspend syz-executor
2220 236079 28667 0 2 0x4081000 syz-executor
2220 10229 28667 0 3 0x4081000 inode syz-executor
28683 389647 61968 0 3 0x80 nanoslp syz-executor
28683 275649 61968 0 3 0x4000080 lockf syz-executor
28683 351466 61968 0 3 0x4000080 fsleep syz-executor
17949 324759 31914 0 3 0x80 nanoslp syz-executor
17949 32833 31914 0 3 0x4000080 kqread syz-executor
17949 80801 31914 0 3 0x4000080 fsleep syz-executor
4711 74899 75591 -1 3 0x90 nanoslp syz-executor
4711 472856 75591 -1 3 0x4000090 kqread syz-executor
4711 439087 75591 -1 3 0x4000090 fsleep syz-executor
52988 98471 0 0 3 0x14200 acct acct
57767 386779 1 0 3 0x100083 ttyin getty
28667 507884 46026 0 3 0x82 nanoslp syz-executor
12833 110236 46026 0 3 0x82 nanoslp syz-executor
19079 210446 46026 0 3 0x82 wait syz-executor
20541 517555 46026 0 3 0x82 nanoslp syz-executor
61968 226980 46026 0 3 0x82 nanoslp syz-executor
75591 150253 46026 0 3 0x82 nanoslp syz-executor
31914 318560 46026 0 3 0x82 nanoslp syz-executor
98106 476356 46026 0 3 0x82 nanoslp syz-executor
46026 35233 47508 0 3 0x82 kqread syz-executor
47508 479461 57717 0 3 0x10008a sigsusp ksh
57717 12947 66033 0 3 0x98 kqread sshd-session
66033 427310 76086 0 3 0x92 kqread sshd-session
76086 222340 1 0 3 0x88 kqread sshd
27172 114252 15562 73 3 0x1100090 kqread syslogd
15562 21898 1 0 3 0x100082 sbwait syslogd
65968 325327 1 0 3 0x100080 kqread resolvd
93965 32799 27294 77 3 0x100092 kqread dhcpleased
81890 389205 27294 77 3 0x100092 kqread dhcpleased
27294 289074 1 0 3 0x80 kqread dhcpleased
45985 402091 0 0 3 0x14200 bored smr
87825 484366 0 0 2 0x14200 zerothread
17188 501173 0 0 3 0x14200 aiodoned aiodoned
41465 223061 0 0 3 0x14200 syncer update
26186 333835 0 0 3 0x14200 cleaner cleaner
64516 508052 0 0 3 0x14200 reaper reaper
79356 344660 0 0 3 0x14200 pgdaemon pagedaemon
8510 112532 0 0 3 0x14200 bored viomb
86666 85697 0 0 3 0x40014200 acpi0 acpi0
11468 423264 0 0 3 0x14200 bored softnet0
90950 370830 0 0 3 0x14200 bored systqmp
14567 133210 0 0 3 0x14200 bored systq
64192 392405 0 0 3 0x40014200 tmoslp softclock
53385 133433 0 0 3 0x40014200 idle0
1 402671 0 0 3 0x82 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 11064 12115K 12452K 166960K 12978 0
pcb 17 14K 16K 166960K 218 0
rtable 238 8K 8K 166960K 406 0
pf 31 13K 13K 166960K 48 0
ifaddr 39 6K 7K 166960K 56 0
ifgroup 48 2K 2K 166960K 71 0
sysctl 4 1K 9K 166960K 11 0
counters 35 17K 18K 166960K 48 0
ioctlops 1 2K 4K 166960K 141 0
iov 0 0K 16K 166960K 14 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1364 86K 86K 166960K 1749 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 3 5K 9K 166960K 9 0
VM map 2 1K 1K 166960K 2 0
sem 10 0K 0K 166960K 10 0
dirhash 12 2K 2K 166960K 21 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 18 65K 97K 166960K 447 0
sigio 0 0K 0K 166960K 14 0
proc 60 59K 124K 166960K 525 0
subproc 72 4K 4K 166960K 72 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 23 0
in_multi 88 6K 7K 166960K 109 0
ether_multi 1 0K 0K 166960K 3 0
mrt 0 0K 0K 166960K 14 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 229 1023K 1023K 166960K 229 0
exec 0 0K 1K 166960K 392 0
fusefs mount 1 32K 32K 166960K 1 0
pfkey data 0 0K 0K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 237 160K 176K 166960K 5646 0
UVM aobj 19 4K 4K 166960K 19 0
pinsyscall 39 78K 96K 166960K 1552 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 18 0
NDP 11 0K 2K 166960K 35 0
temp 46 9064K 9128K 166960K 20824 0
kqueue 15 24K 32K 166960K 83 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 95 0 92 2 0 2 2 0 8 1
rtentry 136 121 0 17 4 0 4 4 0 8 0
unpcb 144 273 0 256 4 0 4 4 0 8 3
syncache 336 5 0 5 1 0 1 1 0 8 1
tcpcb 736 109 0 100 1 0 1 1 0 8 0
arp 96 18 0 2 1 0 1 1 0 8 0
ipq 40 2 0 1 1 0 1 1 0 8 0
ipqe 40 3 0 2 1 0 1 1 0 8 0
inpcb 328 388 0 374 7 0 7 7 0 8 5
ip6q 72 1 0 0 1 0 1 1 0 8 0
ip6af 40 1 0 0 1 0 1 1 0 8 0
nd6 112 29 0 4 1 0 1 1 0 8 0
pkpcb 40 7 0 7 1 0 1 1 0 8 1
kcovpl 48 8 0 0 1 0 1 1 0 8 0
ppxss 1072 13 0 10 1 0 1 1 0 8 0
pppxif 1416 2 0 2 1 0 1 1 0 8 1
pfsrclim 320 2 0 2 1 0 1 1 0 8 1
pfstkey 128 2 0 2 1 0 1 1 0 8 1
pfstate 384 1 0 1 1 0 1 1 0 8 1
pfrule 1360 1 0 1 1 0 1 1 0 8 1
rttmr 136 1 0 1 1 0 1 1 0 8 1
art_heap8 4096 2 0 0 2 0 2 2 0 8 0
art_heap4 256 469 0 52 29 0 29 29 0 8 1
art_table 40 471 0 52 5 0 5 5 0 8 0
art_node 32 120 0 25 1 0 1 1 0 8 0
sysvmsgpl 40 6 0 3 1 0 1 1 0 8 0
semapl 112 8 0 0 1 0 1 1 0 8 0
shmpl 112 16 0 0 1 0 1 1 0 8 0
dirhash 1024 23 0 6 3 0 3 3 0 8 0
dino2pl 256 2158 0 700 92 0 92 92 0 8 0
ffsino 256 2158 0 700 92 0 92 92 0 8 0
nchpl 144 2788 0 1088 64 0 64 64 0 8 0
rtmask 32 5 0 3 1 0 1 1 0 8 0
vnodes 216 2507 0 0 140 0 140 140 0 8 0
namei 1024 9527 0 9527 2 0 2 2 0 8 2
kstatmem 264 38 0 16 2 0 2 2 0 8 0
acpiwqpl 32 1 0 1 1 0 1 1 1 8 1
scsiplug 72 2 0 2 1 0 1 1 0 8 1
scxspl 216 15357 0 15357 3 0 3 3 1 8 3
plimitpl 152 152 0 134 1 0 1 1 0 8 0
sigapl 424 743 0 699 6 0 6 6 0 8 0
knotepl 120 15274 0 15222 16 0 16 16 0 8 13
kqueuepl 184 152 0 139 3 0 3 3 0 8 2
pipepl 304 198 0 171 3 0 3 3 0 8 0
fdescpl 448 729 0 699 5 0 5 5 0 8 1
filepl 120 4184 0 3959 11 0 11 11 0 8 3
lockfpl 104 152 0 147 1 0 1 1 0 8 0
lockfspl 48 68 0 65 1 0 1 1 0 8 0
sessionpl 144 34 0 26 1 0 1 1 0 8 0
pgrppl 48 45 0 29 1 0 1 1 0 8 0
ucredpl 104 576 0 562 1 0 1 1 0 8 0
zombiepl 144 702 0 699 1 0 1 1 0 8 0
processpl 1152 743 0 699 4 0 4 4 0 8 0
procpl 664 1215 0 1160 6 0 6 6 0 8 1
sockpl 552 828 0 794 12 1 11 12 0 8 8
mcl64k 65536 15 0 15 1 0 1 1 0 8 1
mcl16k 16384 1 0 1 1 0 1 1 0 8 1
mcl12k 12288 1 0 1 1 0 1 1 0 8 1
mcl8k 8192 71 0 71 1 0 1 1 0 8 1
mcl4k 4096 2932 0 2880 13 0 13 13 0 8 6
mcl2k 2048 452 0 449 1 0 1 1 0 8 0
mtagpl 96 24 0 5 1 0 1 1 0 8 0
mbufpl 256 7344 0 7171 13 0 13 13 0 8 1
bufpl 280 6245 0 102 439 0 439 439 0 8 0
anonpl 24 144968 0 138245 57 0 57 57 0 187 16
amapchunkpl 152 18458 0 17814 28 0 28 28 0 158 3
amappl16 200 2954 0 2837 15 0 15 15 0 8 4
amappl15 192 15 0 15 1 0 1 1 0 8 1
amappl14 184 408 0 407 1 0 1 1 0 8 0
amappl13 176 122 0 112 1 0 1 1 0 8 0
amappl12 168 971 0 941 2 0 2 2 0 8 0
amappl11 160 3 0 3 1 0 1 1 0 8 1
amappl10 152 62 0 52 1 0 1 1 0 8 0
amappl9 144 267 0 267 1 0 1 1 0 8 1
amappl8 136 105 0 103 1 0 1 1 0 8 0
amappl7 128 147 0 135 1 0 1 1 0 8 0
amappl6 120 148 0 146 1 0 1 1 0 8 0
amappl5 112 99 0 90 1 0 1 1 0 8 0
amappl4 104 266 0 251 1 0 1 1 0 8 0
amappl3 96 3415 0 3296 4 0 4 4 0 8 0
amappl2 88 599 0 544 2 0 2 2 0 8 0
amappl1 80 11310 0 10751 16 0 16 16 0 8 3
amappl 88 4879 0 4707 5 0 5 5 0 92 0
uvmvnodes 80 108 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
dma256 256 6 0 6 1 0 1 1 0 8 1
dma128 128 253 0 253 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 19 0 18 1 0 1 1 0 8 0
aobjpl 72 18 0 0 1 0 1 1 0 8 0
uaddrrnd 24 729 0 699 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 729 0 699 1 0 1 1 0 8 0
vmmpekpl 168 7657 0 7632 2 0 2 2 0 8 0
vmmpepl 168 55207 0 53259 104 0 104 104 0 357 13
vmsppl 368 728 0 699 4 0 4 4 0 8 1
rwobjpl 40 18407 0 17324 15 0 15 15 0 8 1
pdppl 4096 1464 0 1398 100 30 70 82 0 8 4
pvpl 32 351324 0 338937 134 0 134 134 0 265 28
pmappl 216 728 0 699 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 365 0 30 10 0 10 10 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
kcov_remote_enter(0,ffff80002a7afa90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670
timeout_run(ffffffff838810b0,ffff80002a746d98) at timeout_run+0xdf sys/kern/kern_timeout.c:696
softclock_process_tick_timeout(ffff80002a746d98,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756
softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788
softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87
dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
writedisklabel(d02,ffffffff8243f5f0,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158
sdioctl(d02,84946467,ffff80000160a800,3,ffff8000380d9780) at sdioctl+0x959 sys/scsi/sd.c:921
VOP_IOCTL(fffffd8072571990,84946467,ffff80000160a800,3,fffffd8007ffd7b8,ffff8000380d9780) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264
vn_ioctl(fffffd8069eb46a8,84946467,ffff80000160a800,ffff8000380d9780) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531
sys_ioctl(ffff8000380d9780,ffff80003b4fdd90,ffff80003b4fdce0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1
syscall(ffff80003b4fdd90) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003b4fdd90) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x71f2053a190, count: -14
ddb> machine ddbcpu 1
No such command
ddb> trace
kcov_remote_enter(0,ffff80002a7afa90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670
timeout_run(ffffffff838810b0,ffff80002a746d98) at timeout_run+0xdf sys/kern/kern_timeout.c:696
softclock_process_tick_timeout(ffff80002a746d98,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756
softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788
softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87
dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
writedisklabel(d02,ffffffff8243f5f0,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158
sdioctl(d02,84946467,ffff80000160a800,3,ffff8000380d9780) at sdioctl+0x959 sys/scsi/sd.c:921
VOP_IOCTL(fffffd8072571990,84946467,ffff80000160a800,3,fffffd8007ffd7b8,ffff8000380d9780) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264
vn_ioctl(fffffd8069eb46a8,84946467,ffff80000160a800,ffff8000380d9780) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531
sys_ioctl(ffff8000380d9780,ffff80003b4fdd90,ffff80003b4fdce0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1
syscall(ffff80003b4fdd90) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003b4fdd90) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x71f2053a190, count: -14
---
This report is generated by a bot. It may contain errors.
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syzbot found the following issue on:
HEAD commit: 2f434a4256f3 Bump version to 9.1
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=13a84eda580000
kernel config: https://syzkaller.appspot.com/x/.config?x=1bc15e68cd2a49e5
dashboard link: https://syzkaller.appspot.com/bug?extid=c6fd56998e874294bc2f
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/064d43172290/disk-2f434a42.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/e1c14fbda677/bsd-2f434a42.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a8f7c9e8e2f6/kernel-2f434a42.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c6fd56...@syzkaller.appspotmail.com
uvm_fault(0xffffffff8397c948, 0xffff800029ef6000, 0, 2) -> e
kernel: page fault trap, code=2
Stopped at kcov_remote_enter+0x122: movq $0,0(%rcx)
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*304129 7955 0 0 0x4000000 0 syz-executor
kcov_remote_enter(0,ffff80002a7afa90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670
timeout_run(ffffffff838810b0,ffff80002a746d98) at timeout_run+0xdf sys/kern/kern_timeout.c:696
softclock_process_tick_timeout(ffff80002a746d98,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756
softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788
softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87
dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
writedisklabel(d02,ffffffff8243f5f0,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158
sdioctl(d02,84946467,ffff80000160a800,3,ffff8000380d9780) at sdioctl+0x959 sys/scsi/sd.c:921
VOP_IOCTL(fffffd8072571990,84946467,ffff80000160a800,3,fffffd8007ffd7b8,ffff8000380d9780) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264
vn_ioctl(fffffd8069eb46a8,84946467,ffff80000160a800,ffff8000380d9780) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531
sys_ioctl(ffff8000380d9780,ffff80003b4fdd90,ffff80003b4fdce0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1
syscall(ffff80003b4fdd90) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003b4fdd90) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x71f2053a190, count: 1
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: uvm_fault(0xffffffff8397c948, 0xffff800029ef6000, 0, 2) -> e
ddb> trace
kcov_remote_enter(0,ffff80002a7afa90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670
timeout_run(ffffffff838810b0,ffff80002a746d98) at timeout_run+0xdf sys/kern/kern_timeout.c:696
softclock_process_tick_timeout(ffff80002a746d98,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756
softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788
softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87
dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
writedisklabel(d02,ffffffff8243f5f0,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158
sdioctl(d02,84946467,ffff80000160a800,3,ffff8000380d9780) at sdioctl+0x959 sys/scsi/sd.c:921
VOP_IOCTL(fffffd8072571990,84946467,ffff80000160a800,3,fffffd8007ffd7b8,ffff8000380d9780) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264
vn_ioctl(fffffd8069eb46a8,84946467,ffff80000160a800,ffff8000380d9780) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531
sys_ioctl(ffff8000380d9780,ffff80003b4fdd90,ffff80003b4fdce0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1
syscall(ffff80003b4fdd90) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003b4fdd90) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x71f2053a190, count: -14
ddb> show registers
rdi 0xffffffff
rsi 0xffff800000c16c00
rbp 0xffff80003b4fd700
rbx 0xffff80002a7afa90
rdx 0xffff8000380d9780
rcx 0xffff800029ef6000
rax 0xfffffd806cd01c60
r8 0xffff80003b4fd888
r9 0
r10 0xfe595a91d78fc631
r11 0x23e76450fbb675f
r12 0xffffffff814aa960 endtsleep
r13 0xffff80002a746d00
r14 0xffff80002a7afa90
r15 0
rip 0xffffffff831cf702 kcov_remote_enter+0x122
cs 0x8
rflags 0x10297 __ALIGN_SIZE+0xf297
rsp 0xffff80003b4fd6e0
ss 0x10
kcov_remote_enter+0x122: movq $0,0(%rcx)
ddb> show proc
PROC (syz-executor) tid=304129 pid=7955 tcnt=2 stat=onproc
flags process=0 proc=4000000<THREAD>
runpri=32, usrpri=50, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80002a788fa0,0xffffffff8393ebf0
process=0xffff8000ffff8d98 user=0xffff80003b4f8000, vmspace=0xfffffd806bf04748
estcpu=20, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=1
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
7955 357439 20541 0 2 0 syz-executor
* 7955 304129 20541 0 7 0x4000000 syz-executor
99264 413802 12833 0 3 0x90 nanoslp syz-executor
99264 455873 12833 0 3 0x4000090 netacc syz-executor
99264 78773 12833 0 3 0x4000090 fsleep syz-executor
2220 320257 28667 0 3 0x3000 suspend syz-executor
2220 236079 28667 0 2 0x4081000 syz-executor
2220 10229 28667 0 3 0x4081000 inode syz-executor
28683 389647 61968 0 3 0x80 nanoslp syz-executor
28683 275649 61968 0 3 0x4000080 lockf syz-executor
28683 351466 61968 0 3 0x4000080 fsleep syz-executor
17949 324759 31914 0 3 0x80 nanoslp syz-executor
17949 32833 31914 0 3 0x4000080 kqread syz-executor
17949 80801 31914 0 3 0x4000080 fsleep syz-executor
4711 74899 75591 -1 3 0x90 nanoslp syz-executor
4711 472856 75591 -1 3 0x4000090 kqread syz-executor
4711 439087 75591 -1 3 0x4000090 fsleep syz-executor
52988 98471 0 0 3 0x14200 acct acct
57767 386779 1 0 3 0x100083 ttyin getty
28667 507884 46026 0 3 0x82 nanoslp syz-executor
12833 110236 46026 0 3 0x82 nanoslp syz-executor
19079 210446 46026 0 3 0x82 wait syz-executor
20541 517555 46026 0 3 0x82 nanoslp syz-executor
61968 226980 46026 0 3 0x82 nanoslp syz-executor
75591 150253 46026 0 3 0x82 nanoslp syz-executor
31914 318560 46026 0 3 0x82 nanoslp syz-executor
98106 476356 46026 0 3 0x82 nanoslp syz-executor
46026 35233 47508 0 3 0x82 kqread syz-executor
47508 479461 57717 0 3 0x10008a sigsusp ksh
57717 12947 66033 0 3 0x98 kqread sshd-session
66033 427310 76086 0 3 0x92 kqread sshd-session
76086 222340 1 0 3 0x88 kqread sshd
27172 114252 15562 73 3 0x1100090 kqread syslogd
15562 21898 1 0 3 0x100082 sbwait syslogd
65968 325327 1 0 3 0x100080 kqread resolvd
93965 32799 27294 77 3 0x100092 kqread dhcpleased
81890 389205 27294 77 3 0x100092 kqread dhcpleased
27294 289074 1 0 3 0x80 kqread dhcpleased
45985 402091 0 0 3 0x14200 bored smr
87825 484366 0 0 2 0x14200 zerothread
17188 501173 0 0 3 0x14200 aiodoned aiodoned
41465 223061 0 0 3 0x14200 syncer update
26186 333835 0 0 3 0x14200 cleaner cleaner
64516 508052 0 0 3 0x14200 reaper reaper
79356 344660 0 0 3 0x14200 pgdaemon pagedaemon
8510 112532 0 0 3 0x14200 bored viomb
86666 85697 0 0 3 0x40014200 acpi0 acpi0
11468 423264 0 0 3 0x14200 bored softnet0
90950 370830 0 0 3 0x14200 bored systqmp
14567 133210 0 0 3 0x14200 bored systq
64192 392405 0 0 3 0x40014200 tmoslp softclock
53385 133433 0 0 3 0x40014200 idle0
1 402671 0 0 3 0x82 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 11064 12115K 12452K 166960K 12978 0
pcb 17 14K 16K 166960K 218 0
rtable 238 8K 8K 166960K 406 0
pf 31 13K 13K 166960K 48 0
ifaddr 39 6K 7K 166960K 56 0
ifgroup 48 2K 2K 166960K 71 0
sysctl 4 1K 9K 166960K 11 0
counters 35 17K 18K 166960K 48 0
ioctlops 1 2K 4K 166960K 141 0
iov 0 0K 16K 166960K 14 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1364 86K 86K 166960K 1749 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 3 5K 9K 166960K 9 0
VM map 2 1K 1K 166960K 2 0
sem 10 0K 0K 166960K 10 0
dirhash 12 2K 2K 166960K 21 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 18 65K 97K 166960K 447 0
sigio 0 0K 0K 166960K 14 0
proc 60 59K 124K 166960K 525 0
subproc 72 4K 4K 166960K 72 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 23 0
in_multi 88 6K 7K 166960K 109 0
ether_multi 1 0K 0K 166960K 3 0
mrt 0 0K 0K 166960K 14 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 229 1023K 1023K 166960K 229 0
exec 0 0K 1K 166960K 392 0
fusefs mount 1 32K 32K 166960K 1 0
pfkey data 0 0K 0K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 237 160K 176K 166960K 5646 0
UVM aobj 19 4K 4K 166960K 19 0
pinsyscall 39 78K 96K 166960K 1552 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 18 0
NDP 11 0K 2K 166960K 35 0
temp 46 9064K 9128K 166960K 20824 0
kqueue 15 24K 32K 166960K 83 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 95 0 92 2 0 2 2 0 8 1
rtentry 136 121 0 17 4 0 4 4 0 8 0
unpcb 144 273 0 256 4 0 4 4 0 8 3
syncache 336 5 0 5 1 0 1 1 0 8 1
tcpcb 736 109 0 100 1 0 1 1 0 8 0
arp 96 18 0 2 1 0 1 1 0 8 0
ipq 40 2 0 1 1 0 1 1 0 8 0
ipqe 40 3 0 2 1 0 1 1 0 8 0
inpcb 328 388 0 374 7 0 7 7 0 8 5
ip6q 72 1 0 0 1 0 1 1 0 8 0
ip6af 40 1 0 0 1 0 1 1 0 8 0
nd6 112 29 0 4 1 0 1 1 0 8 0
pkpcb 40 7 0 7 1 0 1 1 0 8 1
kcovpl 48 8 0 0 1 0 1 1 0 8 0
ppxss 1072 13 0 10 1 0 1 1 0 8 0
pppxif 1416 2 0 2 1 0 1 1 0 8 1
pfsrclim 320 2 0 2 1 0 1 1 0 8 1
pfstkey 128 2 0 2 1 0 1 1 0 8 1
pfstate 384 1 0 1 1 0 1 1 0 8 1
pfrule 1360 1 0 1 1 0 1 1 0 8 1
rttmr 136 1 0 1 1 0 1 1 0 8 1
art_heap8 4096 2 0 0 2 0 2 2 0 8 0
art_heap4 256 469 0 52 29 0 29 29 0 8 1
art_table 40 471 0 52 5 0 5 5 0 8 0
art_node 32 120 0 25 1 0 1 1 0 8 0
sysvmsgpl 40 6 0 3 1 0 1 1 0 8 0
semapl 112 8 0 0 1 0 1 1 0 8 0
shmpl 112 16 0 0 1 0 1 1 0 8 0
dirhash 1024 23 0 6 3 0 3 3 0 8 0
dino2pl 256 2158 0 700 92 0 92 92 0 8 0
ffsino 256 2158 0 700 92 0 92 92 0 8 0
nchpl 144 2788 0 1088 64 0 64 64 0 8 0
rtmask 32 5 0 3 1 0 1 1 0 8 0
vnodes 216 2507 0 0 140 0 140 140 0 8 0
namei 1024 9527 0 9527 2 0 2 2 0 8 2
kstatmem 264 38 0 16 2 0 2 2 0 8 0
acpiwqpl 32 1 0 1 1 0 1 1 1 8 1
scsiplug 72 2 0 2 1 0 1 1 0 8 1
scxspl 216 15357 0 15357 3 0 3 3 1 8 3
plimitpl 152 152 0 134 1 0 1 1 0 8 0
sigapl 424 743 0 699 6 0 6 6 0 8 0
knotepl 120 15274 0 15222 16 0 16 16 0 8 13
kqueuepl 184 152 0 139 3 0 3 3 0 8 2
pipepl 304 198 0 171 3 0 3 3 0 8 0
fdescpl 448 729 0 699 5 0 5 5 0 8 1
filepl 120 4184 0 3959 11 0 11 11 0 8 3
lockfpl 104 152 0 147 1 0 1 1 0 8 0
lockfspl 48 68 0 65 1 0 1 1 0 8 0
sessionpl 144 34 0 26 1 0 1 1 0 8 0
pgrppl 48 45 0 29 1 0 1 1 0 8 0
ucredpl 104 576 0 562 1 0 1 1 0 8 0
zombiepl 144 702 0 699 1 0 1 1 0 8 0
processpl 1152 743 0 699 4 0 4 4 0 8 0
procpl 664 1215 0 1160 6 0 6 6 0 8 1
sockpl 552 828 0 794 12 1 11 12 0 8 8
mcl64k 65536 15 0 15 1 0 1 1 0 8 1
mcl16k 16384 1 0 1 1 0 1 1 0 8 1
mcl12k 12288 1 0 1 1 0 1 1 0 8 1
mcl8k 8192 71 0 71 1 0 1 1 0 8 1
mcl4k 4096 2932 0 2880 13 0 13 13 0 8 6
mcl2k 2048 452 0 449 1 0 1 1 0 8 0
mtagpl 96 24 0 5 1 0 1 1 0 8 0
mbufpl 256 7344 0 7171 13 0 13 13 0 8 1
bufpl 280 6245 0 102 439 0 439 439 0 8 0
anonpl 24 144968 0 138245 57 0 57 57 0 187 16
amapchunkpl 152 18458 0 17814 28 0 28 28 0 158 3
amappl16 200 2954 0 2837 15 0 15 15 0 8 4
amappl15 192 15 0 15 1 0 1 1 0 8 1
amappl14 184 408 0 407 1 0 1 1 0 8 0
amappl13 176 122 0 112 1 0 1 1 0 8 0
amappl12 168 971 0 941 2 0 2 2 0 8 0
amappl11 160 3 0 3 1 0 1 1 0 8 1
amappl10 152 62 0 52 1 0 1 1 0 8 0
amappl9 144 267 0 267 1 0 1 1 0 8 1
amappl8 136 105 0 103 1 0 1 1 0 8 0
amappl7 128 147 0 135 1 0 1 1 0 8 0
amappl6 120 148 0 146 1 0 1 1 0 8 0
amappl5 112 99 0 90 1 0 1 1 0 8 0
amappl4 104 266 0 251 1 0 1 1 0 8 0
amappl3 96 3415 0 3296 4 0 4 4 0 8 0
amappl2 88 599 0 544 2 0 2 2 0 8 0
amappl1 80 11310 0 10751 16 0 16 16 0 8 3
amappl 88 4879 0 4707 5 0 5 5 0 92 0
uvmvnodes 80 108 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
dma256 256 6 0 6 1 0 1 1 0 8 1
dma128 128 253 0 253 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 19 0 18 1 0 1 1 0 8 0
aobjpl 72 18 0 0 1 0 1 1 0 8 0
uaddrrnd 24 729 0 699 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 729 0 699 1 0 1 1 0 8 0
vmmpekpl 168 7657 0 7632 2 0 2 2 0 8 0
vmmpepl 168 55207 0 53259 104 0 104 104 0 357 13
vmsppl 368 728 0 699 4 0 4 4 0 8 1
rwobjpl 40 18407 0 17324 15 0 15 15 0 8 1
pdppl 4096 1464 0 1398 100 30 70 82 0 8 4
pvpl 32 351324 0 338937 134 0 134 134 0 265 28
pmappl 216 728 0 699 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 365 0 30 10 0 10 10 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
kcov_remote_enter(0,ffff80002a7afa90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670
timeout_run(ffffffff838810b0,ffff80002a746d98) at timeout_run+0xdf sys/kern/kern_timeout.c:696
softclock_process_tick_timeout(ffff80002a746d98,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756
softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788
softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87
dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
writedisklabel(d02,ffffffff8243f5f0,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158
sdioctl(d02,84946467,ffff80000160a800,3,ffff8000380d9780) at sdioctl+0x959 sys/scsi/sd.c:921
VOP_IOCTL(fffffd8072571990,84946467,ffff80000160a800,3,fffffd8007ffd7b8,ffff8000380d9780) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264
vn_ioctl(fffffd8069eb46a8,84946467,ffff80000160a800,ffff8000380d9780) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531
sys_ioctl(ffff8000380d9780,ffff80003b4fdd90,ffff80003b4fdce0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1
syscall(ffff80003b4fdd90) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003b4fdd90) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x71f2053a190, count: -14
ddb> machine ddbcpu 1
No such command
ddb> trace
kcov_remote_enter(0,ffff80002a7afa90) at kcov_remote_enter+0x122 sys/dev/kcov.c:670
timeout_run(ffffffff838810b0,ffff80002a746d98) at timeout_run+0xdf sys/kern/kern_timeout.c:696
softclock_process_tick_timeout(ffff80002a746d98,0) at softclock_process_tick_timeout+0x230 sys/kern/kern_timeout.c:756
softclock(0) at softclock+0x152 sys/kern/kern_timeout.c:788
softintr_dispatch(0) at softintr_dispatch+0xf9 sys/kern/kern_softintr.c:87
dosoftint(0) at dosoftint+0x48 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
writedisklabel(d02,ffffffff8243f5f0,ffff800000039000) at writedisklabel+0x1b8 sys/arch/amd64/amd64/disksubr.c:158
sdioctl(d02,84946467,ffff80000160a800,3,ffff8000380d9780) at sdioctl+0x959 sys/scsi/sd.c:921
VOP_IOCTL(fffffd8072571990,84946467,ffff80000160a800,3,fffffd8007ffd7b8,ffff8000380d9780) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264
vn_ioctl(fffffd8069eb46a8,84946467,ffff80000160a800,ffff8000380d9780) at vn_ioctl+0xea sys/kern/vfs_vnops.c:531
sys_ioctl(ffff8000380d9780,ffff80003b4fdd90,ffff80003b4fdce0) at sys_ioctl+0x660 sys/kern/sys_generic.c:-1
syscall(ffff80003b4fdd90) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80003b4fdd90) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x71f2053a190, count: -14
---
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