syzbot
kernel:E pag NUM aau
Status:
upstream: reported on 2026/07/27 20:54
Reported-by: syzbot+590f08fd9ef24579a52e@syzkaller.appspotmail.com
First crash: 2h09m, last: 2h09m
Sample crash report:
66kernel:E pag 0 aau
Stopped at savectx+0xae: movl $0,%gs:0x688
TID PID UID PRFLAGS PFLAGS CPU COMMAND
394357 65244 0 0 0x4000000 1K syz-executor
*208783 74902 0 0 0 0 syz-executor
savectx() at savectx+0xae
end of kernel
end trace frame: 0x75bfad0c41b0, count: 14
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
*cpu1: uvm_fault(0xfffff2006cf10018, 0x98, 0, 1) -> e
ddb{0}> show kasan
No such command
ddb{0}> trace
savectx() at savectx+0xae
end of kernel
end trace frame: 0x75bfad0c41b0, count: -1
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff800034f87fd0
rbx 0
rdx 0
rcx 0xffff8000383902c0
rax 0x3b
r8 0xffff800034f87f00
r9 0
r10 0x20c8f910cdcf063e
r11 0x7de42f9b49a9b327
r12 0
r13 0
r14 0xffff8000383902c0
r15 0
rip 0xffffffff817bc3ee savectx+0xae
cs 0x8
rflags 0x46
rsp 0xffff800034f87f50
ss 0x10
savectx+0xae: movl $0,%gs:0x688
ddb{0}> show proc
PROC (syz-executor) tid=208783 pid=74902 tcnt=3 stat=onproc
flags process=0 proc=0
runpri=63, usrpri=63, slppri=17, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff800045feea78,0xffff800038391260
process=0xffff800045feb9d8 user=0xffff800034f83000, vmspace=0xfffff2006cf103e8
estcpu=13, cpticks=7, pctcpu=0.4, user=4, sys=3, intr=0
ddb{0}> ps
PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND
77014 463320 9183 0 2 0x10 0 syz-executor
77014 298161 9183 0 3 0x10 0x4000080 fsleep syz-executor
64878 73167 30537 0 2 0 0 syz-executor
64878 169911 30537 0 3 0 0x4000080 fsleep syz-executor
79017 112958 55655 0 2 0 0 syz-executor
79017 318613 55655 0 3 0 0x4000080 fsleep syz-executor
48311 361728 1 0 3 0x2 0x80 nanoslp getty
94673 20574 66761 0 3 0 0x80 nanoslp syz-executor
94673 169798 66761 0 3 0 0x4000080 fsleep syz-executor
94673 333591 66761 0 2 0 0x4000000 syz-executor
94673 264986 66761 0 3 0 0x4000080 fsleep syz-executor
65244 73127 33093 0 2 0 0 syz-executor
65244 394357 33093 0 7 0 0x4000000 syz-executor
54498 204442 312 0 2 0x4000000 0 syz-executor
54498 32512 312 0 3 0x4000000 0x4000000 biowait syz-executor
54498 463459 312 0 3 0x4000000 0x4000080 fsleep syz-executor
*74902 208783 9050 0 7 0 0 syz-executor
74902 152813 9050 0 3 0 0x4000080 fsleep syz-executor
74902 326615 9050 0 3 0 0x4000080 fsleep syz-executor
30537 16841 40457 0 3 0x2 0x80 nanoslp syz-executor
9050 330261 40457 0 3 0x2 0x80 nanoslp syz-executor
9183 329591 40457 0 3 0x2 0x80 nanoslp syz-executor
312 346089 40457 0 3 0x2 0x80 nanoslp syz-executor
33093 198491 40457 0 3 0x2 0x80 nanoslp syz-executor
55779 461263 40457 0 3 0x2 0 biowait syz-executor
55655 80752 40457 0 3 0x2 0x80 nanoslp syz-executor
66761 247732 40457 0 3 0x2 0x80 nanoslp syz-executor
40457 134700 1 0 3 0x2 0x80 kqread syz-executor
4057 145109 0 0 3 0x14000 0x200 bored smr
29914 415286 0 0 2 0x14000 0x200 zerothread
51168 168566 0 0 3 0x14000 0x200 aiodoned aiodoned
17354 423561 0 0 3 0x14000 0x200 syncer update
8138 486634 0 0 3 0x14000 0x200 cleaner cleaner
31642 446944 0 0 3 0x14000 0x200 reaper reaper
1126 489378 0 0 3 0x14000 0x200 pgdaemon pagedaemon
72145 239706 0 0 3 0x14000 0x200 bored viomb
10881 384330 0 0 3 0x14000 0x40000200 acpi0 acpi0
17614 277365 0 0 3 0x14000 0x40000200 idle1
26424 321965 0 0 3 0x14000 0x200 bored softnet1
841 187807 0 0 3 0x14000 0x200 bored softnet0
24036 116094 0 0 3 0x14000 0x200 bored systqmp
43631 537 0 0 3 0x14000 0x200 bored systq
51142 17466 0 0 3 0x14000 0x200 tmoslp softclockmp
24785 98086 0 0 3 0x14000 0x40000200 tmoslp softclock
3478 203873 0 0 3 0x14000 0x40000200 idle0
1 394358 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 &pmap->pm_mtx r = 0 (0xfffff2006cedb610)
#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_write_protect+0x80 rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline]
#2 pmap_write_protect+0x80 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:441 [inline]
#2 pmap_write_protect+0x80 sys/arch/amd64/amd64/pmap.c:2173
#3 uvm_map_protect+0xb95 pmap_protect sys/arch/amd64/compile/SYZKALLER/obj/machine/pmap.h:481 [inline]
#3 uvm_map_protect+0xb95 sys/uvm/uvm_map.c:3202
#4 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590
#5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783
#6 Xsyscall+0x128
Process 65244 (syz-executor) thread 0xffff80002a222540 (394357)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a157c0)
#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 54498 (syz-executor) thread 0xffff800045fe6550 (32512)
exclusive rrwlock inode r = 0 (0xfffff200722d2dd8)
#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 vn_write+0x18f sys/kern/vfs_vnops.c:411
#6 dofilewritev+0x2bd sys/kern/sys_generic.c:384
#7 sys_write+0xa2 sys/kern/sys_generic.c:300
#8 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783
#9 Xsyscall+0x128
Process 74902 (syz-executor) thread 0xffff8000383902c0 (208783)
exclusive rwlock uobjlk r = 0 (0xfffff2006cee29d0)
#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 uvm_map_protect+0xb36 sys/uvm/uvm_map.c:3202
#3 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590
#4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783
#5 Xsyscall+0x128
exclusive rwlock vmmaplk r = 0 (0xfffff2006cf104e8)
#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 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5170
#3 uvm_map_protect+0xe0 sys/uvm/uvm_map.c:3075
#4 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590
#5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783
#6 Xsyscall+0x128
exclusive mutex &pmap->pm_mtx r = 0 (0xfffff2006cedb610)
#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_write_protect+0x80 rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline]
#2 pmap_write_protect+0x80 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:441 [inline]
#2 pmap_write_protect+0x80 sys/arch/amd64/amd64/pmap.c:2173
#3 uvm_map_protect+0xb95 pmap_protect sys/arch/amd64/compile/SYZKALLER/obj/machine/pmap.h:481 [inline]
#3 uvm_map_protect+0xb95 sys/uvm/uvm_map.c:3202
#4 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590
#5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:783
#6 Xsyscall+0x128
Process 55779 (syz-executor) thread 0xffff80002a2234d0 (461263)
exclusive rrwlock inode r = 0 (0xfffff2006d0e61e8)
#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 vget+0x2a2 sys/kern/vfs_subr.c:692
#6 ufs_ihashget+0x185 sys/ufs/ufs/ufs_ihash.c:98
#7 ffs_vget+0x8c sys/ufs/ffs/ffs_vfsops.c:1203
#8 ufs_lookup+0x1a36 sys/ufs/ufs/ufs_lookup.c:478
#9 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85
#10 vfs_lookup+0x963 sys/kern/vfs_lookup.c:580
#11 namei+0x7c5 sys/kern/vfs_lookup.c:250
#12 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1807
#13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#14 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffff2006ed53478)
#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 vget+0x2a2 sys/kern/vfs_subr.c:692
#6 cache_lookup+0x351 sys/kern/vfs_cache.c:222
#7 ufs_lookup+0x1e3 sys/ufs/ufs/ufs_lookup.c:160
#8 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85
#9 vfs_lookup+0x963 sys/kern/vfs_lookup.c:580
#10 namei+0x7c5 sys/kern/vfs_lookup.c:250
#11 dounlinkat+0xc1 sys/kern/vfs_syscalls.c:1807
#12 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#12 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
#13 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11056 12019K 12420K 166960K 12282 0
pcb 17 12K 12K 166960K 38 0
rtable 240 7K 7K 166960K 357 0
pf 35 17K 24K 166960K 74 0
ifaddr 44 7K 7K 166960K 46 0
ifgroup 55 2K 2K 166960K 55 0
sysctl 1 1K 9K 166960K 5 0
counters 70 37K 37K 166960K 70 0
ioctlops 0 0K 4K 166960K 1493 0
iov 0 0K 0K 166960K 4 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1299 82K 82K 166960K 1418 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 3 0
VM map 2 1K 1K 166960K 2 0
sem 5 0K 0K 166960K 6 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1734 201K 291K 166960K 11964 0
file desc 16 61K 93K 166960K 213 0
sigio 0 0K 0K 166960K 1 0
proc 21 33K 180K 166960K 577 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 12 0
in_multi 103 7K 7K 166960K 104 0
ether_multi 1 0K 0K 166960K 1 0
mrt 0 0K 0K 166960K 7 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 115 519K 519K 166960K 115 0
exec 0 0K 1K 166960K 431 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 136 82K 168K 166960K 3831 0
UVM aobj 5 2K 2K 166960K 5 0
pinsyscall 19 38K 104K 166960K 1376 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 1 0
NDP 12 0K 1K 166960K 29 0
temp 35 9114K 9150K 166960K 4140 0
kqueue 2 4K 30K 166960K 46 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 39 0 39 1 0 1 1 0 8 1
rtentry 176 112 0 2 5 0 5 5 0 8 0
unpcb 144 68 0 68 1 0 1 1 0 8 1
syncache 336 5 0 5 1 0 1 1 0 8 1
tcpcb 736 30 0 29 1 0 1 1 0 8 0
arp 136 18 0 0 1 0 1 1 0 8 0
inpcb 328 129 0 127 2 0 2 2 0 8 1
nd6 152 24 0 0 1 0 1 1 0 8 0
kcovpl 48 8 0 0 1 0 1 1 0 8 0
pfstscr 40 2 0 0 1 0 1 1 0 8 0
pffrag 232 4 0 1 1 0 1 1 0 482 0
pffrnode 88 4 0 1 1 0 1 1 0 8 0
pffrent 40 5 0 2 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
pfrktable 1344 1 0 0 1 0 1 1 0 8 0
pfsrclim 320 2 0 1 1 0 1 1 0 8 0
pfstlim 224 1 0 1 1 0 1 1 0 8 1
pfanchor 1288 8 0 3 1 0 1 1 0 8 0
pfstitem 24 27 0 0 1 0 1 1 0 8 0
pfstkey 128 27 0 0 1 0 1 1 0 8 0
pfstate 448 26 0 0 3 0 3 3 0 8 0
pfrule 1360 21 0 16 2 1 1 2 0 8 0
rttmr 136 1 0 1 1 0 1 1 0 8 1
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 452 0 0 29 0 29 29 0 8 0
art_table 40 453 0 0 5 0 5 5 0 8 0
art_node 32 112 0 12 1 0 1 1 0 8 0
semupl 112 1 0 1 1 0 1 1 0 8 1
semapl 72 4 0 1 1 0 1 1 0 8 0
shmpl 112 2 0 0 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1716 0 240 93 0 93 93 0 8 0
ffsino 296 1716 0 240 114 0 114 114 0 8 0
nchpl 144 2011 0 304 64 0 64 64 0 8 0
vnodes 216 1833 0 0 102 0 102 102 0 8 0
namei 1024 6269 0 6269 2 0 2 2 0 8 2
percpumem 16 51 0 0 1 0 1 1 0 8 0
kstatmem 264 27 0 0 2 0 2 2 0 8 0
scxspl 216 8599 0 8597 4 2 2 3 1 8 1
plimitpl 152 81 0 69 1 0 1 1 0 8 0
sigapl 424 532 0 497 7 0 7 7 0 8 1
knotepl 120 289 0 0 9 0 9 9 0 8 0
kqueuepl 224 51 0 49 2 0 2 2 0 8 1
pipepl 344 160 0 133 6 0 6 6 0 8 3
fdescpl 528 516 0 497 3 0 3 3 0 8 0
filepl 160 2099 0 1933 14 0 14 14 0 8 4
lockfpl 104 43 0 40 1 0 1 1 0 8 0
lockfspl 48 18 0 16 1 0 1 1 0 8 0
sessionpl 144 28 0 26 1 0 1 1 0 8 0
pgrppl 48 36 0 26 1 0 1 1 0 8 0
ucredpl 104 240 0 236 1 0 1 1 0 8 0
zombiepl 144 497 0 497 1 0 1 1 0 8 1
processpl 1232 532 0 497 5 0 5 5 0 8 1
procpl 664 673 0 627 6 0 6 6 0 8 0
sockpl 752 238 0 236 5 0 5 5 0 8 3
mcl64k 65536 4 0 0 1 0 1 1 0 8 0
mcl16k 16384 2 0 0 1 0 1 1 0 8 0
mcl12k 12288 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 122 0 0 16 0 16 16 0 8 0
mcl2k 2048 15 0 0 2 0 2 2 0 8 0
mextrefs 64 16 0 0 1 0 1 1 0 8 0
mtagpl 96 2 0 0 1 0 1 1 0 8 0
mbufpl 256 152 0 0 10 0 10 10 0 8 0
bufpl 272 4099 0 105 267 0 267 267 0 8 0
anonpl 32 5511 0 0 45 0 45 45 0 247 0
amapchunkpl 152 11006 0 10638 26 0 26 26 0 158 6
amappl16 200 1693 0 1626 6 2 4 5 0 8 0
amappl15 192 22 0 22 1 1 0 1 0 8 0
amappl14 184 430 0 430 1 0 1 1 0 8 1
amappl13 176 126 0 125 1 0 1 1 0 8 0
amappl12 168 772 0 754 2 0 2 2 0 8 0
amappl11 160 7 0 7 1 0 1 1 0 8 1
amappl10 152 67 0 67 1 0 1 1 0 8 1
amappl9 144 287 0 287 1 1 0 1 0 8 0
amappl8 136 101 0 101 1 0 1 1 0 8 1
amappl7 128 172 0 170 1 0 1 1 0 8 0
amappl6 120 159 0 159 1 0 1 1 0 8 1
amappl5 112 207 0 207 1 0 1 1 0 8 1
amappl4 104 299 0 295 1 0 1 1 0 8 0
amappl3 96 1962 0 1877 4 0 4 4 0 8 0
amappl2 88 540 0 532 2 0 2 2 0 8 0
amappl1 80 10913 0 10791 15 0 15 15 0 8 4
amappl 88 3035 0 2913 5 0 5 5 0 92 1
uvmvnodes 80 102 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 7 0 7 2 1 1 1 0 8 1
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 4 0 0 1 0 1 1 0 8 0
uaddrrnd 24 516 0 497 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 516 0 497 1 0 1 1 0 8 0
vmmpekpl 168 6307 0 6267 2 0 2 2 0 8 0
vmmpepl 168 42602 0 41706 88 0 88 88 0 357 31
vmsppl 488 515 0 497 5 0 5 5 0 8 1
rwobjpl 80 15269 0 14796 24 0 24 24 0 8 1
pdppl 4096 1039 0 994 97 42 55 85 0 8 10
pvpl 32 11521 0 0 95 2 93 93 0 265 0
pmappl 256 515 0 497 3 0 3 3 0 8 0
extentpl 40 46 0 28 1 0 1 1 0 8 0
phpool 112 537 0 45 15 0 15 15 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
savectx() at savectx+0xae
end of kernel
end trace frame: 0x75bfad0c41b0, 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_read_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:670
comcnputc(800,74) at comcnputc+0xd0 comcn_read_reg sys/dev/ic/com.c:1671 [inline]
comcnputc(800,74) at comcnputc+0xd0 sys/dev/ic/com.c:1264
cnputc(74) at cnputc+0x67 sys/dev/cons.c:218
db_putchar(74) at db_putchar+0x36d sys/ddb/db_output.c:155
kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1
db_printf(ffffffff834ae9d9) at db_printf+0x9b sys/kern/subr_prf.c:-1
db_ktrap(6,0,ffff80002a2205e0) at db_ktrap+0x1b6 db_printtrap sys/arch/amd64/amd64/db_interface.c:103 [inline]
db_ktrap(6,0,ffff80002a2205e0) at db_ktrap+0x1b6 sys/arch/amd64/amd64/db_interface.c:128
kerntrap(ffff80002a2205e0) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
dovutimens(ffff80002a222540,fffff2005fa913b0,ffff80002a2207c0) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691
sys_futimes(ffff80002a222540,ffff80002a220910,ffff80002a220860) at sys_futimes+0x208 sys/kern/vfs_syscalls.c:2733
end trace frame: 0xffff80002a220900, 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_read_1(3f8,5) at x86_bus_space_io_read_1+0x37 sys/arch/amd64/amd64/bus_space.c:670
comcnputc(800,74) at comcnputc+0xd0 comcn_read_reg sys/dev/ic/com.c:1671 [inline]
comcnputc(800,74) at comcnputc+0xd0 sys/dev/ic/com.c:1264
cnputc(74) at cnputc+0x67 sys/dev/cons.c:218
db_putchar(74) at db_putchar+0x36d sys/ddb/db_output.c:155
kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1
db_printf(ffffffff834ae9d9) at db_printf+0x9b sys/kern/subr_prf.c:-1
db_ktrap(6,0,ffff80002a2205e0) at db_ktrap+0x1b6 db_printtrap sys/arch/amd64/amd64/db_interface.c:103 [inline]
db_ktrap(6,0,ffff80002a2205e0) at db_ktrap+0x1b6 sys/arch/amd64/amd64/db_interface.c:128
kerntrap(ffff80002a2205e0) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:519
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
dovutimens(ffff80002a222540,fffff2005fa913b0,ffff80002a2207c0) at dovutimens+0x368 sys/kern/vfs_syscalls.c:2691
sys_futimes(ffff80002a222540,ffff80002a220910,ffff80002a220860) at sys_futimes+0x208 sys/kern/vfs_syscalls.c:2733
syscall(ffff80002a220910) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a220910) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x2576bf049c0, count: -16
ddb{1}>
Struck through repros no longer work on HEAD.