syzbot
uvm_fault: x86_ipi_db (9)
Status:
upstream: reported on 2025/02/14 23:55
Reported-by: syzbot+a157c6e0d81b4f6b71a4@syzkaller.appspotmail.com
First crash: 538d, last: 14m
Sample crash report:
*cpu1: uvm_fault(0xfffff6006cd335d8, 0x98, 0, 1) -> e
ddb{0}> show kasan
No such command
ddb{0}> trace
proc_trampoline() at proc_trampoline+0xc7
end of kernel
end trace frame: 0x727ea8b34410, count: -1
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff80003439a4a0
rbx 0
rdx 0
rcx 0xffff80002a2214d8
rax 0x2a
r8 0xffff80003439a3d0
r9 0x4
r10 0xe9fa18be6b76f133
r11 0x29fe73ab18d2400c
r12 0
r13 0
r14 0
r15 0
rip 0xffffffff828434c7 proc_trampoline+0xc7
cs 0x8
rflags 0x246
rsp 0xffff80003439a420
ss 0
proc_trampoline+0xc7: movl $0,%gs:0x688
ddb{0}> show proc
PROC (syz-executor) tid=519618 pid=34849 tcnt=1 stat=onproc
flags process=0 proc=0
runpri=50, usrpri=50, slppri=17, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80002a220548,0xffffffff83b323c8
process=0xffff800045fec4e8 user=0xffff800034395000, vmspace=0xfffff6006fbcbb78
estcpu=5, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND
*34849 519618 57074 0 7 0 0 syz-executor
31418 363688 65904 0 2 0 0 syz-executor
31418 320824 65904 0 3 0 0x4000080 fsleep syz-executor
27848 421461 21970 0 2 0 0 syz-executor
27848 506296 21970 0 7 0 0x4000000 syz-executor
80237 470964 47622 -1 2 0x10 0 syz-executor
80237 270051 47622 -1 3 0x10 0x4000080 fsleep syz-executor
4211 45657 88271 0 3 0 0x80 nanoslp syz-executor
4211 42596 88271 0 3 0 0x4000080 lockf syz-executor
4211 156090 88271 0 3 0 0x4000080 fsleep syz-executor
55147 176805 30181 0 2 0x1 0xc80 syz-executor
55147 55146 30181 0 3 0x1 0x4000080 ttyout syz-executor
55147 498881 30181 0 3 0x1 0x4000080 fsleep syz-executor
29105 444183 54763 0 2 0x2 0 syz-executor
93613 70961 54763 0 3 0x2 0 biowait syz-executor
65904 46358 54763 0 2 0x2 0xc80 syz-executor
88271 133842 54763 0 2 0x2 0xc80 syz-executor
47622 54150 54763 0 2 0x2 0xc80 syz-executor
57074 444818 54763 0 3 0x2 0x80 nanoslp syz-executor
30181 414987 54763 0 2 0x2 0xc80 syz-executor
21970 333881 54763 0 3 0x2 0x80 nanoslp syz-executor
54763 15802 59639 0 2 0x2 0 syz-executor
59639 128657 79932 0 3 0x100002 0x88 sigsusp ksh
79932 235510 16307 0 3 0x10 0x88 kqread sshd-session
16307 187994 76619 0 3 0x12 0x80 kqread sshd-session
3296 327384 1 0 3 0x100003 0x80 ttyin getty
76619 36734 1 0 3 0 0x88 kqread sshd
43356 72255 71296 74 3 0x1100012 0x80 bpf pflogd
71296 298333 1 0 3 0 0x80 sbwait pflogd
83889 341585 78686 73 3 0x1100010 0x80 kqread syslogd
78686 361646 1 0 3 0x100002 0x80 sbwait syslogd
62960 213168 1 0 3 0x100000 0x80 kqread resolvd
65558 82147 82920 77 3 0x100012 0x80 kqread dhcpleased
96911 189903 82920 77 3 0x100012 0x80 kqread dhcpleased
82920 12063 1 0 3 0 0x80 kqread dhcpleased
70808 520826 0 0 3 0x14000 0x200 bored smr
34734 324432 0 0 2 0x14000 0x200 zerothread
39531 480047 0 0 3 0x14000 0x200 aiodoned aiodoned
79669 358270 0 0 3 0x14000 0x200 syncer update
72034 135907 0 0 3 0x14000 0x200 cleaner cleaner
61579 478041 0 0 3 0x14000 0x200 reaper reaper
45368 45810 0 0 3 0x14000 0x200 pgdaemon pagedaemon
22858 257516 0 0 3 0x14000 0x200 bored viomb
97233 316049 0 0 3 0x14000 0x40000200 acpi0 acpi0
711 158565 0 0 3 0x14000 0x40000200 idle1
63356 148188 0 0 3 0x14000 0x200 bored softnet1
2220 223899 0 0 3 0x14000 0x200 bored softnet0
95160 445546 0 0 3 0x14000 0x200 bored systqmp
50086 499975 0 0 3 0x14000 0x200 bored systq
60535 419682 0 0 3 0x14000 0x200 tmoslp softclockmp
53894 60419 0 0 3 0x14000 0x40000200 tmoslp softclock
73091 120589 0 0 3 0x14000 0x40000200 idle0
1 251167 0 0 3 0x2 0x80 wait init
0 0 -1 0 3 0x10000 0x200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &(curpg)->mdpage.pv_mtx r = 0 (0xfffff600089bb798)
#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+0x4b4 sys/kern/kern_lock.c:487
#2 pmap_enter+0x83a pmap_enter_pv sys/arch/amd64/amd64/pmap.c:1104 [inline]
#2 pmap_enter+0x83a sys/arch/amd64/amd64/pmap.c:2888
#3 uvm_fault_lower_lookup+0x369 sys/uvm/uvm_fault.c:-1
#4 uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1334
#5 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1
#6 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
#7 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
#8 recall_trap+0x8
exclusive mutex &pmap->pm_mtx r = 0 (0xfffff6006cc8bf10)
#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+0x4b4 sys/kern/kern_lock.c:487
#2 pmap_enter+0x24b rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline]
#2 pmap_enter+0x24b pmap_map_ptes sys/arch/amd64/amd64/pmap.c:441 [inline]
#2 pmap_enter+0x24b sys/arch/amd64/amd64/pmap.c:2777
#3 uvm_fault_lower_lookup+0x369 sys/uvm/uvm_fault.c:-1
#4 uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1334
#5 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1
#6 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
#7 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
#8 recall_trap+0x8
Process 34849 (syz-executor) thread 0xffff80002a2214d8 (519618)
shared rwlock uobjlk r = 0 (0xfffff6006d1af608)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413
#2 uvm_fault_lower_lookup+0x53 sys/uvm/uvm_fault.c:1204
#3 uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1334
#4 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1
#5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
#6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
#7 recall_trap+0x8
shared rwlock vmmaplk r = 0 (0xfffff6006fbcbc78)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413
#2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880
#3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693
#4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627
#5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
#6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
#7 recall_trap+0x8
exclusive mutex &(curpg)->mdpage.pv_mtx r = 0 (0xfffff600089bb798)
#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+0x4b4 sys/kern/kern_lock.c:487
#2 pmap_enter+0x83a pmap_enter_pv sys/arch/amd64/amd64/pmap.c:1104 [inline]
#2 pmap_enter+0x83a sys/arch/amd64/amd64/pmap.c:2888
#3 uvm_fault_lower_lookup+0x369 sys/uvm/uvm_fault.c:-1
#4 uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1334
#5 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1
#6 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
#7 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
#8 recall_trap+0x8
exclusive mutex &pmap->pm_mtx r = 0 (0xfffff6006cc8bf10)
#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+0x4b4 sys/kern/kern_lock.c:487
#2 pmap_enter+0x24b rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline]
#2 pmap_enter+0x24b pmap_map_ptes sys/arch/amd64/amd64/pmap.c:441 [inline]
#2 pmap_enter+0x24b sys/arch/amd64/amd64/pmap.c:2777
#3 uvm_fault_lower_lookup+0x369 sys/uvm/uvm_fault.c:-1
#4 uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1334
#5 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1
#6 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
#7 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
#8 recall_trap+0x8
Process 27848 (syz-executor) thread 0xffff80002a220548 (506296)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83b165c0)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline]
#1 syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783
#2 Xsyscall+0x128
Process 93613 (syz-executor) thread 0xffff80002a220a78 (70961)
exclusive rrwlock inode r = 0 (0xfffff6006f67c930)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320
#2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
#3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
#4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline]
#4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:150
#5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232
#6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393
#7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112
#8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394
#9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3063
#10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#11 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffff6006d7fcd70)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320
#2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
#3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
#4 vn_lock+0xa4 sys/kern/vfs_vnops.c:576
#5 vfs_lookup+0x12b sys/kern/vfs_lookup.c:431
#6 namei+0x7c5 sys/kern/vfs_lookup.c:250
#7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3048
#8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#9 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11058 12220K 12284K 166960K 12165 0
pcb 17 12K 12K 166960K 22 0
rtable 215 6K 7K 166960K 353 0
pf 34 17K 19K 166960K 49 0
ifaddr 39 6K 7K 166960K 45 0
ifgroup 51 2K 2K 166960K 55 0
sysctl 1 1K 9K 166960K 5 0
counters 68 36K 37K 166960K 70 0
ioctlops 0 0K 4K 166960K 1489 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1292 81K 81K 166960K 1381 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 1K 166960K 2 0
VM map 2 1K 1K 166960K 2 0
sem 3 0K 0K 166960K 3 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1734 201K 291K 166960K 11964 0
file desc 16 57K 97K 166960K 156 0
proc 71 115K 164K 166960K 553 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 2 0
in_multi 88 5K 6K 166960K 100 0
ether_multi 1 0K 0K 166960K 1 0
mrt 1 0K 0K 166960K 2 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 55 254K 254K 166960K 55 0
exec 0 0K 1K 166960K 389 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 222 159K 172K 166960K 3206 0
UVM aobj 3 2K 2K 166960K 3 0
pinsyscall 41 82K 106K 166960K 1322 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
NDP 25 1K 2K 166960K 28 0
temp 33 9114K 9190K 166960K 3981 0
kqueue 13 20K 24K 166960K 30 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 28 0 0 1 0 1 1 0 8 0
rtpcb 120 34 0 31 1 0 1 1 0 8 0
rtentry 176 111 0 12 5 0 5 5 0 8 0
unpcb 144 44 0 27 1 0 1 1 0 8 0
syncache 336 4 0 4 1 0 1 1 0 8 1
tcpcb 736 11 0 6 1 0 1 1 0 8 0
arp 136 18 0 2 1 0 1 1 0 8 0
inpcb 328 78 0 70 2 0 2 2 0 8 0
nd6 152 24 0 3 1 0 1 1 0 8 0
kcovpl 48 8 0 0 1 0 1 1 0 8 0
pfstscr 40 3 0 0 1 0 1 1 0 8 0
pfosfp 40 1428 0 1005 5 0 5 5 0 8 0
pfosfpen 112 1428 0 714 21 0 21 21 0 8 0
pfstitem 24 26 0 0 1 0 1 1 0 8 0
pfstkey 128 26 0 0 1 0 1 1 0 8 0
pfstate 448 24 0 0 3 0 3 3 0 8 0
pfrule 1360 21 0 16 2 1 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 452 0 44 29 0 29 29 0 8 1
art_table 40 453 0 44 5 0 5 5 0 8 0
art_node 32 111 0 21 1 0 1 1 0 8 0
semapl 72 1 0 0 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1606 0 138 92 0 92 92 0 8 0
ffsino 296 1606 0 138 114 0 114 114 0 8 0
nchpl 144 1825 0 125 64 0 64 64 0 8 0
vnodes 216 1706 0 0 95 0 95 95 0 8 0
namei 1024 5616 0 5615 2 0 2 2 0 8 1
percpumem 16 51 0 1 1 0 1 1 0 8 0
kstatmem 264 27 0 2 2 0 2 2 0 8 0
scxspl 216 6291 0 6290 4 2 2 3 1 8 1
plimitpl 152 31 0 13 1 0 1 1 0 8 0
sigapl 424 476 0 430 7 0 7 7 0 8 1
knotepl 120 526 0 0 16 0 16 16 0 8 0
kqueuepl 224 29 0 20 1 0 1 1 0 8 0
pipepl 344 130 0 103 3 0 3 3 0 8 0
fdescpl 528 460 0 430 3 0 3 3 0 8 0
filepl 160 1665 0 1445 10 0 10 10 0 8 0
lockfpl 104 12 0 7 1 0 1 1 0 8 0
lockfspl 48 7 0 3 1 0 1 1 0 8 0
sessionpl 144 27 0 17 1 0 1 1 0 8 0
pgrppl 48 35 0 17 1 0 1 1 0 8 0
ucredpl 104 113 0 99 1 0 1 1 0 8 0
zombiepl 144 430 0 430 1 0 1 1 0 8 1
processpl 1232 476 0 430 5 0 5 5 0 8 1
procpl 664 508 0 455 5 0 5 5 0 8 0
sockpl 752 157 0 129 4 0 4 4 0 8 0
mcl64k 65536 9 0 0 2 0 2 2 0 8 0
mcl16k 16384 3 0 0 1 0 1 1 0 8 0
mcl12k 12288 1 0 0 1 0 1 1 0 8 0
mcl9k128 9344 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 4 0 0 1 0 1 1 0 8 0
mcl4k 4096 117 0 0 15 0 15 15 0 8 0
mcl2k 2048 15 0 0 2 0 2 2 0 8 0
mextrefs 64 10 0 0 1 0 1 1 0 8 0
mtagpl 96 1 0 0 1 0 1 1 0 8 0
mbufpl 256 126 0 0 8 0 8 8 0 8 0
bufpl 272 2342 0 105 150 0 150 150 0 8 0
anonpl 32 5426 0 0 44 0 44 44 0 247 0
amapchunkpl 152 9207 0 8754 25 0 25 25 0 158 0
amappl16 200 1950 0 1930 5 0 5 5 0 8 3
amappl15 192 9 0 9 1 0 1 1 0 8 1
amappl14 184 430 0 429 1 0 1 1 0 8 0
amappl13 176 122 0 110 1 0 1 1 0 8 0
amappl12 168 711 0 682 2 0 2 2 0 8 0
amappl11 160 5 0 4 1 0 1 1 0 8 0
amappl10 152 88 0 74 1 0 1 1 0 8 0
amappl9 144 276 0 275 1 0 1 1 0 8 0
amappl8 136 102 0 100 1 0 1 1 0 8 0
amappl7 128 151 0 138 1 0 1 1 0 8 0
amappl6 120 181 0 180 1 0 1 1 0 8 0
amappl5 112 98 0 87 1 0 1 1 0 8 0
amappl4 104 295 0 274 1 0 1 1 0 8 0
amappl3 96 1537 0 1447 3 0 3 3 0 8 0
amappl2 88 578 0 505 2 0 2 2 0 8 0
amappl1 80 10518 0 9917 15 0 15 15 0 8 1
amappl 88 2466 0 2317 4 0 4 4 0 92 0
uvmvnodes 80 99 0 0 3 0 3 3 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 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 460 0 430 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 460 0 430 1 0 1 1 0 8 0
vmmpekpl 168 5814 0 5778 2 0 2 2 0 8 0
vmmpepl 168 39022 0 37179 87 0 87 87 0 357 1
vmsppl 488 459 0 430 5 0 5 5 0 8 1
rwobjpl 80 14869 0 13856 25 0 25 25 0 8 2
pdppl 4096 927 0 860 101 14 87 87 0 8 20
pvpl 32 13051 0 0 106 0 106 106 0 265 0
pmappl 256 459 0 430 3 0 3 3 0 8 0
extentpl 40 46 0 28 1 0 1 1 0 8 0
phpool 112 420 0 17 12 0 12 12 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
proc_trampoline() at proc_trampoline+0xc7
end of kernel
end trace frame: 0x727ea8b34410, count: -1
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffff80002999dff0) 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
x86_bus_space_io_write_1(3f8,0,29) at x86_bus_space_io_write_1+0x40 sys/arch/amd64/amd64/bus_space.c:790
comcnputc(800,29) at comcnputc+0x1ab bus_space_barrier sys/dev/ic/com.c:-1 [inline]
comcnputc(800,29) at comcnputc+0x1ab sys/dev/ic/com.c:1268
cnputc(29) at cnputc+0x67 sys/dev/cons.c:218
db_putchar(29) at db_putchar+0x36d sys/ddb/db_output.c:155
kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1
db_printf(ffffffff834613a7) at db_printf+0x9b sys/kern/subr_prf.c:-1
fault(ffffffff83521c81) at fault+0xa7 sys/arch/amd64/amd64/trap.c:161
kpageflttrap(ffff80002eb82a70,98) at kpageflttrap+0x37d sys/arch/amd64/amd64/trap.c:296
kerntrap(ffff80002eb82a70) at kerntrap+0x19d sys/arch/amd64/amd64/trap.c:528
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
dovutimens(ffff80002a220548,fffff6006811d6d8,ffff80002eb82c50) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691
end trace frame: 0xffff80002eb82cc0, count: 0
ddb{1}> trace
x86_ipi_db(ffff80002999dff0) 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
x86_bus_space_io_write_1(3f8,0,29) at x86_bus_space_io_write_1+0x40 sys/arch/amd64/amd64/bus_space.c:790
comcnputc(800,29) at comcnputc+0x1ab bus_space_barrier sys/dev/ic/com.c:-1 [inline]
comcnputc(800,29) at comcnputc+0x1ab sys/dev/ic/com.c:1268
cnputc(29) at cnputc+0x67 sys/dev/cons.c:218
db_putchar(29) at db_putchar+0x36d sys/ddb/db_output.c:155
kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1
db_printf(ffffffff834613a7) at db_printf+0x9b sys/kern/subr_prf.c:-1
fault(ffffffff83521c81) at fault+0xa7 sys/arch/amd64/amd64/trap.c:161
kpageflttrap(ffff80002eb82a70,98) at kpageflttrap+0x37d sys/arch/amd64/amd64/trap.c:296
kerntrap(ffff80002eb82a70) at kerntrap+0x19d sys/arch/amd64/amd64/trap.c:528
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
dovutimens(ffff80002a220548,fffff6006811d6d8,ffff80002eb82c50) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691
sys_futimes(ffff80002a220548,ffff80002eb82da0,ffff80002eb82cf0) at sys_futimes+0x208 sys/kern/vfs_syscalls.c:2733
syscall(ffff80002eb82da0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002eb82da0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x4723fb3db90, count: -17
Struck through repros no longer work on HEAD.