*cpu0: uvm_fault(0xffffffff82b4bc08, 0xffff80001cfdf004, 0, 1) -> d ddb{1}> trace proc_trampoline() at proc_trampoline+0xdc end of kernel end trace frame: 0x7f7fffffb1e0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff800029afc630 rbx 0 rdx 0 rcx 0 rax 0x2a r8 0xffff800029afc560 r9 0 r10 0xab2cf6c8f3233f3b r11 0x84a056954392ac78 r12 0 r13 0 r14 0 r15 0 rip 0xffffffff816c350c proc_trampoline+0xdc cs 0x8 rflags 0x246 rsp 0xffff800029afc5b0 ss 0 proc_trampoline+0xdc: movl $0,%gs:0x538 ddb{1}> show proc PROC (syz-executor.4) pid=232266 stat=onproc flags process=2 proc=0 pri=84, usrpri=84, nice=20 forw=0xffffffffffffffff, list=0xffff800029b07268,0xffff80002c950550 process=0xffff80002c9310c0 user=0xffff800029af7000, vmspace=0xfffffd807c9dc028 estcpu=36, cpticks=1, pctcpu=0.1 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 26811 421996 27138 0 7 0 syz-executor.7 55416 368660 69191 0 2 0 syz-executor.3 55416 174150 69191 0 3 0x4000080 fsleep syz-executor.3 25392 252170 45225 0 2 0 syz-executor.6 25392 117926 45225 0 2 0x4000000 syz-executor.6 25392 180840 45225 0 2 0x4000000 syz-executor.6 52582 59235 92934 0 3 0x80 nanoslp syz-executor.5 52582 283988 92934 0 3 0x4000080 ttyout syz-executor.5 52582 24307 92934 0 3 0x4000080 fsleep syz-executor.5 25269 296304 25014 0 3 0x80 nanoslp syz-executor.0 25269 440765 25014 0 3 0x4000080 netio syz-executor.0 25269 300014 25014 0 3 0x4000080 fsleep syz-executor.0 24043 287957 97374 0 2 0x2 syz-executor.1 25014 440783 97374 0 2 0x2 syz-executor.0 27138 464266 97374 0 3 0x82 nanoslp syz-executor.7 84314 344459 0 0 3 0x14200 acct acct 92934 479343 97374 0 3 0x82 nanoslp syz-executor.5 45225 26821 97374 0 3 0x82 nanoslp syz-executor.6 *59005 232266 97374 0 7 0x2 syz-executor.4 60439 504805 0 0 3 0x14280 nfsidl nfsio 35282 63953 0 0 3 0x14280 nfsidl nfsio 66648 333704 0 0 3 0x14280 nfsidl nfsio 34355 98748 0 0 3 0x14280 nfsidl nfsio 58894 376096 0 0 3 0x14280 nfsidl nfsio 16489 196416 0 0 3 0x14280 nfsidl nfsio 51382 334489 0 0 3 0x14280 nfsidl nfsio 18157 228143 0 0 3 0x14280 nfsidl nfsio 63121 446110 0 0 3 0x14280 nfsidl nfsio 17278 363781 0 0 3 0x14280 nfsidl nfsio 41452 236961 0 0 3 0x14280 nfsidl nfsio 96636 336558 0 0 3 0x14280 nfsidl nfsio 83298 152438 0 0 3 0x14280 nfsidl nfsio 52257 304397 0 0 3 0x14280 nfsidl nfsio 46368 479413 0 0 3 0x14280 nfsidl nfsio 31785 246446 0 0 3 0x14280 nfsidl nfsio 32477 434260 0 0 3 0x14280 nfsidl nfsio 72728 407122 0 0 3 0x14280 nfsidl nfsio 59642 283476 0 0 3 0x14280 nfsidl nfsio 53905 112866 0 0 3 0x14280 nfsidl nfsio 45764 244992 0 0 3 0x14200 bored sosplice 2457 130916 97374 0 2 0x2 syz-executor.2 69191 76409 97374 0 3 0x82 nanoslp syz-executor.3 97374 45864 81098 0 3 0x82 thrsleep syz-fuzzer 97374 474631 81098 0 3 0x4000082 nanoslp syz-fuzzer 97374 215057 81098 0 3 0x4000082 thrsleep syz-fuzzer 97374 212888 81098 0 3 0x4000082 kqread syz-fuzzer 97374 516444 81098 0 3 0x4000082 thrsleep syz-fuzzer 97374 348972 81098 0 3 0x4000082 thrsleep syz-fuzzer 97374 114359 81098 0 3 0x4000082 thrsleep syz-fuzzer 97374 361783 81098 0 3 0x4000082 thrsleep syz-fuzzer 97374 253012 81098 0 3 0x4000082 thrsleep syz-fuzzer 81098 327875 16331 0 3 0x10008a sigsusp ksh 16331 93388 86893 0 3 0x9a kqread sshd 96004 227529 1 0 3 0x100083 ttyin getty 86893 186160 1 0 3 0x88 kqread sshd 48129 384195 14944 74 3 0x1100092 bpf pflogd 14944 96170 1 0 3 0x80 netio pflogd 64612 226175 60328 73 3 0x1100090 kqread syslogd 60328 480979 1 0 3 0x100082 netio syslogd 78698 107600 1 0 3 0x100080 kqread resolvd 15693 137337 75099 77 3 0x100092 kqread dhcpleased 54909 196953 75099 77 3 0x100092 kqread dhcpleased 75099 54880 1 0 3 0x80 kqread dhcpleased 86126 33154 0 0 3 0x14200 bored smr 82616 385116 0 0 2 0x14200 zerothread 61696 458631 0 0 3 0x14200 aiodoned aiodoned 88250 494265 0 0 3 0x14200 syncer update 29877 222356 0 0 3 0x14200 cleaner cleaner 16404 220031 0 0 3 0x14200 reaper reaper 49852 289863 0 0 3 0x14200 pgdaemon pagedaemon 66995 320291 0 0 3 0x14200 bored viomb 90447 413971 0 0 3 0x40014200 acpi0 acpi0 86460 80169 0 0 3 0x40014200 idle1 78007 201804 0 0 3 0x14200 bored softnet 85600 503909 0 0 3 0x14200 bored systqmp 11660 111895 0 0 3 0x14200 bored systq 96057 64093 0 0 2 0x40014200 softclock 62339 437989 0 0 3 0x40014200 idle0 1 16192 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff82b1c1f0) #0 witness_lock+0x44d #1 mtx_enter_try+0x100 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 uvm_pmr_getpages+0xeac sys/uvm/uvm_pmemrange.c:1205 #4 uvm_pagealloc+0x1a4 sys/uvm/uvm_page.c:911 #5 uvm_fault_lower+0x1aa #6 uvm_fault+0x248 #7 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #8 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403 #9 recall_trap+0x8 Process 26811 (syz-executor.7) thread 0xffff800029b062a8 (421996) exclusive rrwlock inode r = 0 (0xfffffd8066a91920) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:413 #6 namei+0x36a sys/kern/vfs_lookup.c:245 #7 sys_chdir+0x72 change_dir sys/kern/vfs_syscalls.c:845 [inline] #7 sys_chdir+0x72 sys/kern/vfs_syscalls.c:791 #8 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 1 (0xffffffff829c9818) #0 witness_lock+0x44d #1 syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline] #1 syscall+0x3ef sys/arch/amd64/amd64/trap.c:585 #2 Xsyscall+0x128 Process 24043 (syz-executor.1) thread 0xffff8000ffff2548 (287957) exclusive rrwlock inode r = 0 (0xfffffd807837f4e8) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vget+0x1d3 sys/kern/vfs_subr.c:678 #6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1318 #8 ufs_lookup+0x13ba sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x58 sys/kern/vfs_vops.c:85 #10 vfs_lookup+0x6e5 sys/kern/vfs_lookup.c:561 #11 namei+0x36a sys/kern/vfs_lookup.c:245 #12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1850 #13 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #13 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd805b51da30) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:579 #5 vfs_lookup+0xd1 sys/kern/vfs_lookup.c:413 #6 namei+0x36a sys/kern/vfs_lookup.c:245 #7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1850 #8 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #9 Xsyscall+0x128 Process 59005 (syz-executor.4) thread 0xffff80002c951500 (232266) exclusive rwlock amaplk r = 0 (0xfffffd8064c74cf8) #0 witness_lock+0x44d #1 uvm_fault_check+0x3ca sys/uvm/uvm_fault.c:774 #2 uvm_fault+0x102 sys/uvm/uvm_fault.c:602 #3 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #4 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403 #5 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd807c9dc040) #0 witness_lock+0x44d #1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 #2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 #3 uvm_fault+0x102 sys/uvm/uvm_fault.c:602 #4 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #5 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403 #6 recall_trap+0x8 exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff82b1c1f0) #0 witness_lock+0x44d #1 mtx_enter_try+0x100 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 uvm_pmr_getpages+0xeac sys/uvm/uvm_pmemrange.c:1205 #4 uvm_pagealloc+0x1a4 sys/uvm/uvm_page.c:911 #5 uvm_fault_lower+0x1aa #6 uvm_fault+0x248 #7 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:181 #8 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:403 #9 recall_trap+0x8 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10213 6624K 7414K 78643K 22732 0 pcb 13 14K 16K 78643K 703 0 rtable 231 22K 24K 78643K 2581 0 ifaddr 97 21K 22K 78643K 878 0 sysctl 2 0K 0K 78643K 2 0 counters 56 35K 36K 78643K 208 0 ioctlops 0 0K 4K 78643K 2875 0 iov 0 0K 24K 78643K 681 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1522 95K 95K 78643K 4849 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 62 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 33 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 15 53K 97K 78643K 5396 0 sigio 0 0K 0K 78643K 12 0 proc 70 87K 136K 78643K 1316 0 subproc 104 6K 6K 78643K 338 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 174 0 in_multi 84 5K 6K 78643K 480 0 ether_multi 1 0K 0K 78643K 47 0 mrt 1 0K 0K 78643K 22 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 169 758K 758K 78643K 169 0 exec 0 0K 2K 78643K 1647 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 442 565K 566K 78643K 71374 0 UVM aobj 101 8K 8K 78643K 110 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 252 0 NDP 13 0K 2K 78643K 151 0 temp 169 4781K 4853K 78643K 85502 0 kqueue 12 18K 26K 78643K 355 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 481 0 478 9 8 1 5 0 8 0 rtentry 112 506 0 419 4 0 4 4 0 8 0 unpcb 136 12024 0 12007 95 92 3 13 0 8 1 syncache 296 16 0 16 8 8 0 1 0 8 0 tcpqe 32 46 0 46 5 5 0 1 0 8 0 tcpcb 736 1458 0 1454 58 57 1 13 0 8 0 arp 120 57 0 43 1 0 1 1 0 8 0 inpcb 312 4070 0 4063 83 82 1 11 0 8 0 rttmr 72 5 0 5 2 2 0 1 0 8 0 nd6 48 92 0 72 1 0 1 1 0 8 0 pkpcb 40 5 0 5 1 1 0 1 0 8 0 kcovpl 48 26 0 18 1 0 1 1 0 8 0 ppxss 1248 32 0 32 10 9 1 1 0 8 1 pfstscr 40 6 0 3 1 0 1 1 0 8 0 pffrag 232 82 0 78 2 1 1 1 0 482 0 pffrnode 88 82 0 78 2 1 1 1 0 8 0 pffrent 40 255 0 251 2 1 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 377 0 362 5 3 2 2 0 8 0 pftag 88 9 0 6 2 1 1 1 0 8 0 pfqueue 264 2 0 2 1 1 0 1 0 8 0 pfstitem 24 36 0 28 1 0 1 1 0 8 0 pfstkey 112 42 0 38 1 0 1 1 0 8 0 pfstate 320 32 0 27 2 0 2 2 0 8 0 pfrule 1360 495 0 463 9 6 3 3 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 1992 0 1595 39 14 25 29 0 8 0 art_table 32 1994 0 1595 4 0 4 4 0 8 0 art_node 16 497 0 421 1 0 1 1 0 8 0 sysvmsgpl 40 34 0 23 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 18 0 8 1 0 1 1 0 8 0 shmpl 112 107 0 9 3 0 3 3 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 8766 0 7313 92 0 92 92 0 8 0 ffsino 272 8766 0 7313 98 0 98 98 0 8 0 nchpl 144 15997 0 14382 63 0 63 63 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 55875 0 55874 8 7 1 2 0 8 0 percpumem 16 116 0 76 1 0 1 1 0 8 0 vcpupl 2048 33 0 0 5 0 5 5 0 8 0 vmpool 560 36 0 3 3 0 3 3 0 8 0 pfiaddrpl 120 107 0 90 3 2 1 1 0 8 0 scxspl 216 51588 0 51588 20 19 1 8 0 8 1 plimitpl 152 561 0 546 1 0 1 1 0 8 0 sigapl 424 5690 0 5626 8 0 8 8 0 8 0 futexpl 64 45197 0 45194 6 5 1 1 0 8 0 knotepl 120 743 0 0 10 0 10 10 0 8 0 kqueuepl 216 1160 0 1152 19 14 5 5 0 8 4 pipepl 336 1137 0 1109 36 30 6 8 0 8 3 fdescpl 496 5653 0 5625 5 1 4 5 0 8 0 filepl 152 42633 0 42386 128 112 16 26 0 8 2 lockfpl 104 1576 0 1573 4 3 1 2 0 8 0 lockfspl 48 434 0 431 1 0 1 1 0 8 0 sessionpl 144 42 0 25 1 0 1 1 0 8 0 pgrppl 48 50 0 33 1 0 1 1 0 8 0 ucredpl 96 4396 0 4383 1 0 1 1 0 8 0 zombiepl 144 5626 0 5626 4 3 1 1 0 8 1 processpl 1064 5690 0 5626 5 0 5 5 0 8 0 procpl 672 17062 0 16983 24 15 9 9 0 8 1 srpgc 96 26 0 26 5 5 0 1 0 8 0 sosppl 168 54 0 54 7 6 1 1 0 8 1 sockpl 480 16590 0 16563 515 503 12 52 0 8 7 mcl64k 65536 20 0 0 3 1 2 3 0 8 0 mcl16k 16384 16 0 0 2 0 2 2 0 8 0 mcl12k 12288 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 19 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 8 0 0 1 0 1 1 0 8 0 mcl2k 2048 221 0 0 19 1 18 19 0 8 0 mtagpl 96 407 0 0 6 0 6 6 0 8 0 mbufpl 256 9048 0 0 551 0 551 551 0 8 0 bufpl 288 11953 0 5617 453 0 453 453 0 8 0 anonpl 24 1611368 0 1592070 204 71 133 151 0 186 0 amapchunkpl 152 176455 0 175628 55 17 38 46 0 158 0 amappl16 200 13693 0 13019 88 49 39 48 0 8 0 amappl15 192 1206 0 1200 1 0 1 1 0 8 0 amappl14 184 423 0 416 2 1 1 1 0 8 0 amappl13 176 363 0 360 1 0 1 1 0 8 0 amappl12 168 994 0 987 2 1 1 1 0 8 0 amappl11 160 1036 0 1020 1 0 1 1 0 8 0 amappl10 152 806 0 799 1 0 1 1 0 8 0 amappl9 144 804 0 797 1 0 1 1 0 8 0 amappl8 136 1753 0 1658 5 1 4 4 0 8 0 amappl7 128 908 0 898 1 0 1 1 0 8 0 amappl6 120 593 0 566 2 1 1 2 0 8 0 amappl5 112 4809 0 4792 1 0 1 1 0 8 0 amappl4 104 3350 0 3315 4 3 1 2 0 8 0 amappl3 96 1654 0 1640 1 0 1 1 0 8 0 amappl2 88 1305 0 1252 3 1 2 3 0 8 0 amappl1 80 106547 0 105984 24 11 13 19 0 8 0 amappl 88 70453 0 70177 9 1 8 8 0 92 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 72 109 0 9 2 0 2 2 0 8 0 uaddrrnd 24 5689 0 5628 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5689 0 5628 1 0 1 1 0 8 0 vmmpekpl 168 50696 0 50626 4 0 4 4 0 8 0 vmmpepl 168 523910 0 521262 277 144 133 156 0 357 0 vmsppl 368 5688 0 5628 7 1 6 6 0 8 0 rwobjpl 56 133157 0 125409 113 1 112 112 0 8 0 pdppl 4096 11385 0 11289 477 375 102 102 0 8 6 pvpl 32 2798622 0 2774761 434 215 219 265 0 265 0 pmappl 248 5688 0 5628 5 1 4 4 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 1954 0 576 40 0 40 40 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff829abff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 x86_bus_space_io_read_1(3f8,5) at x86_bus_space_io_read_1+0x28 sys/arch/amd64/amd64/bus_space.c:639 comcnputc(800,66) at comcnputc+0x97 sys/dev/ic/com.c:1259 cnputc(66) at cnputc+0x4b sys/dev/cons.c:239 db_putchar(66) at db_putchar+0x3fc sys/ddb/db_output.c:155 kprintf() at kprintf+0x20ec sys/kern/subr_prf.c:1068 db_printf(ffffffff8263dd6e) at db_printf+0x85 sys/kern/subr_prf.c:502 fault(ffffffff825efcca) at fault+0x95 sys/arch/amd64/amd64/trap.c:154 kpageflttrap(ffff80002e3a4a90,ffff80001cfdf004) at kpageflttrap+0x25a sys/arch/amd64/amd64/trap.c:275 kerntrap(ffff80002e3a4a90) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b ufs_lookup() at ufs_lookup+0x4ce sys/ufs/ufs/ufs_lookup.c:281 end trace frame: 0xffff80002e3a4cb0, count: 0 ddb{0}> trace x86_ipi_db(ffffffff829abff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 x86_bus_space_io_read_1(3f8,5) at x86_bus_space_io_read_1+0x28 sys/arch/amd64/amd64/bus_space.c:639 comcnputc(800,66) at comcnputc+0x97 sys/dev/ic/com.c:1259 cnputc(66) at cnputc+0x4b sys/dev/cons.c:239 db_putchar(66) at db_putchar+0x3fc sys/ddb/db_output.c:155 kprintf() at kprintf+0x20ec sys/kern/subr_prf.c:1068 db_printf(ffffffff8263dd6e) at db_printf+0x85 sys/kern/subr_prf.c:502 fault(ffffffff825efcca) at fault+0x95 sys/arch/amd64/amd64/trap.c:154 kpageflttrap(ffff80002e3a4a90,ffff80001cfdf004) at kpageflttrap+0x25a sys/arch/amd64/amd64/trap.c:275 kerntrap(ffff80002e3a4a90) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b ufs_lookup() at ufs_lookup+0x4ce sys/ufs/ufs/ufs_lookup.c:281 VOP_LOOKUP(fffffd80769611f8,ffff80002e3a4e38,ffff80002e3a4e68) at VOP_LOOKUP+0x58 sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002e3a4e08) at vfs_lookup+0x6e5 sys/kern/vfs_lookup.c:561 namei(ffff80002e3a4e08) at namei+0x36a sys/kern/vfs_lookup.c:245 sys_chdir(ffff800029b062a8,ffff80002e3a4f10,ffff80002e3a4f70) at sys_chdir+0x72 change_dir sys/kern/vfs_syscalls.c:845 [inline] sys_chdir(ffff800029b062a8,ffff80002e3a4f10,ffff80002e3a4f70) at sys_chdir+0x72 sys/kern/vfs_syscalls.c:791 syscall(ffff80002e3a4fe0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002e3a4fe0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffffb840, count: -20 ddb{0}> machine ddbcpu 1 Stopped at proc_trampoline+0xdc: movl $0,%gs:0x538 proc_trampoline() at proc_trampoline+0xdc end of kernel end trace frame: 0x7f7fffffb1e0, count: 14 ddb{1}> trace proc_trampoline() at proc_trampoline+0xdc end of kernel end trace frame: 0x7f7fffffb1e0, count: -1