*cpu0: uvm_fault(0xfffffd8069eff2f0, 0x8, 0, 1) -> e ddb{1}> trace alltraps_kern_meltdown() at alltraps_kern_meltdown+0xa6 copyout() at copyout+0x53 trapsignal(ffff800027c0d268,b,6,2,20000000) at trapsignal+0x5f9 sys/kern/kern_sig.c:828 upageflttrap(ffff80002e4645f0,20000000) at upageflttrap+0x154 sys/arch/amd64/amd64/trap.c:205 usertrap(ffff80002e4645f0) at usertrap+0x1aa sys/arch/amd64/amd64/trap.c:417 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffd4710, count: -6 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002e464230 rbx 0 rdx 0 rcx 0 rax 0x2a r8 0xffff80002e464160 r9 0 r10 0xf6e3c830a3fd08ba r11 0x31ba8b4e0d369770 r12 0xffff80002e45f000 r13 0xffff80002e4645f0 r14 0x7f7ffffd3f30 r15 0xffff800027c0d268 rip 0xffffffff825721f9 alltraps_kern_meltdown+0xa6 cs 0x8 rflags 0x246 rsp 0xffff80002e4641b0 ss 0 alltraps_kern_meltdown+0xa6: movl %ebx,%gs:0x540 ddb{1}> show proc PROC (syz-executor.7) pid=119181 stat=onproc flags process=0 proc=0 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800021296d28,0xffff800027c0c7f8 process=0xffff8000ffff0018 user=0xffff80002e45f000, vmspace=0xfffffd8066eef5e0 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *93792 119181 70650 0 7 0 syz-executor.7 93792 213392 70650 0 3 0x4000080 fsleep syz-executor.7 76250 361051 19546 0 2 0 syz-executor.6 76250 38255 19546 0 3 0x4000080 kqread syz-executor.6 33117 39772 69124 0 7 0x1 syz-executor.3 33117 217983 69124 0 3 0x4000080 fsleep syz-executor.3 33117 229816 69124 0 3 0x4000080 fsleep syz-executor.3 33117 30014 69124 0 3 0x4000080 fsleep syz-executor.3 87893 157677 81827 0 2 0x482 syz-executor.4 45749 208117 81827 0 3 0x82 piperd syz-executor.2 68674 433732 81827 0 3 0x82 nanoslp syz-executor.1 21248 31491 0 0 3 0x14200 bored sosplice 19546 503696 81827 0 3 0x82 nanoslp syz-executor.6 74372 65729 0 0 3 0x14280 nfsidl nfsio 79128 113718 0 0 3 0x14280 nfsidl nfsio 80956 128756 0 0 3 0x14280 nfsidl nfsio 59848 304830 0 0 3 0x14280 nfsidl nfsio 59723 147819 0 0 3 0x14280 nfsidl nfsio 36864 477348 0 0 3 0x14280 nfsidl nfsio 3992 491058 0 0 3 0x14280 nfsidl nfsio 22312 404148 0 0 3 0x14280 nfsidl nfsio 17185 326146 0 0 3 0x14280 nfsidl nfsio 15617 355594 0 0 3 0x14280 nfsidl nfsio 55208 275323 0 0 3 0x14280 nfsidl nfsio 70579 229386 0 0 3 0x14280 nfsidl nfsio 64173 280220 0 0 3 0x14280 nfsidl nfsio 10822 406203 0 0 3 0x14280 nfsidl nfsio 44204 413531 0 0 3 0x14280 nfsidl nfsio 46703 66593 0 0 3 0x14280 nfsidl nfsio 64332 429687 0 0 3 0x14280 nfsidl nfsio 54328 101688 0 0 3 0x14280 nfsidl nfsio 62945 321687 0 0 3 0x14280 nfsidl nfsio 16357 302280 0 0 3 0x14280 nfsidl nfsio 70650 463881 81827 0 3 0x82 nanoslp syz-executor.7 44631 289259 81827 0 2 0x482 syz-executor.5 69124 116558 81827 0 3 0x82 nanoslp syz-executor.3 87323 315401 81827 0 3 0x3 kernel: protection fault trap, code=0 Faulted in DDB; continuing... ddb{1}> show all locks CPU 1: exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd805ad32ab8) #0 witness_lock+0x44d #1 mtx_enter_try+0x100 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 pmap_enter+0x1bf pmap_map_ptes sys/arch/amd64/amd64/pmap.c:420 [inline] #3 pmap_enter+0x1bf sys/arch/amd64/amd64/pmap.c:2699 #4 uvm_fault_upper+0x2b1 sys/uvm/uvm_fault.c:1057 #5 uvm_fault+0x154 sys/uvm/uvm_fault.c:609 #6 kpageflttrap+0x22e sys/arch/amd64/amd64/trap.c:277 #7 kerntrap+0xef sys/arch/amd64/amd64/trap.c:332 #8 alltraps_kern_meltdown+0x7b #9 copyout+0x53 #10 trapsignal+0x5f9 sys/kern/kern_sig.c:828 #11 upageflttrap+0x154 sys/arch/amd64/amd64/trap.c:205 #12 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:417 #13 recall_trap+0x8 Process 93792 (syz-executor.7) thread 0xffff800027c0d268 (119181) exclusive rwlock amaplk r = 0 (0xfffffd8069e69600) #0 witness_lock+0x44d #1 uvm_fault_check+0x419 sys/uvm/uvm_fault.c:783 #2 uvm_fault+0xf2 sys/uvm/uvm_fault.c:601 #3 kpageflttrap+0x22e sys/arch/amd64/amd64/trap.c:277 #4 kerntrap+0xef sys/arch/amd64/amd64/trap.c:332 #5 alltraps_kern_meltdown+0x7b #6 copyout+0x53 #7 trapsignal+0x5f9 sys/kern/kern_sig.c:828 #8 upageflttrap+0x154 sys/arch/amd64/amd64/trap.c:205 #9 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:417 #10 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd8066eef688) #0 witness_lock+0x44d #1 uvmfault_lookup+0xc9 sys/uvm/uvm_fault.c:1773 #2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:673 #3 uvm_fault+0xf2 sys/uvm/uvm_fault.c:601 #4 kpageflttrap+0x22e sys/arch/amd64/amd64/trap.c:277 #5 kerntrap+0xef sys/arch/amd64/amd64/trap.c:332 #6 alltraps_kern_meltdown+0x7b #7 copyout+0x53 #8 trapsignal+0x5f9 sys/kern/kern_sig.c:828 #9 upageflttrap+0x154 sys/arch/amd64/amd64/trap.c:205 #10 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:417 #11 recall_trap+0x8 exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd805ad32ab8) #0 witness_lock+0x44d #1 mtx_enter_try+0x100 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 pmap_enter+0x1bf pmap_map_ptes sys/arch/amd64/amd64/pmap.c:420 [inline] #3 pmap_enter+0x1bf sys/arch/amd64/amd64/pmap.c:2699 #4 uvm_fault_upper+0x2b1 sys/uvm/uvm_fault.c:1057 #5 uvm_fault+0x154 sys/uvm/uvm_fault.c:609 #6 kpageflttrap+0x22e sys/arch/amd64/amd64/trap.c:277 #7 kerntrap+0xef sys/arch/amd64/amd64/trap.c:332 #8 alltraps_kern_meltdown+0x7b #9 copyout+0x53 #10 trapsignal+0x5f9 sys/kern/kern_sig.c:828 #11 upageflttrap+0x154 sys/arch/amd64/amd64/trap.c:205 #12 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:417 #13 recall_trap+0x8 Process 33117 (syz-executor.3) thread 0xffff8000ffff4540 (39772) exclusive rrwlock inode r = 0 (0xfffffd80749a4d58) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:465 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:564 #5 vget+0x1fc sys/kern/vfs_subr.c:676 #6 ktrwriteraw+0x130 sys/kern/kern_ktrace.c:657 #7 ktrpsig+0x1b6 ktrwrite sys/kern/kern_ktrace.c:603 [inline] #7 ktrpsig+0x1b6 sys/kern/kern_ktrace.c:293 #8 trapsignal+0x5c7 sys/kern/kern_sig.c:828 #9 upageflttrap+0x154 sys/arch/amd64/amd64/trap.c:205 #10 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:417 #11 recall_trap+0x8 exclusive kernel_lock &kernel_lock r = 1 (0xffffffff82a77650) #0 witness_lock+0x44d #1 ktrpsig+0x14a ktrwrite sys/kern/kern_ktrace.c:590 [inline] #1 ktrpsig+0x14a sys/kern/kern_ktrace.c:293 #2 trapsignal+0x5c7 sys/kern/kern_sig.c:828 #3 upageflttrap+0x154 sys/arch/amd64/amd64/trap.c:205 #4 usertrap+0x1aa sys/arch/amd64/amd64/trap.c:417 #5 recall_trap+0x8 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10218 6564K 7601K 78643K 20285 0 pcb 77 12K 12K 78643K 564 0 rtable 185 5K 7K 78643K 1307 0 ifaddr 70 16K 18K 78643K 353 0 sysctl 2 0K 0K 78643K 2 0 counters 58 35K 36K 78643K 184 0 ioctlops 0 0K 4K 78643K 2046 0 iov 0 0K 16K 78643K 642 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1530 96K 96K 78643K 3904 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 25 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 292 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 13 45K 81K 78643K 1926 0 sigio 0 0K 0K 78643K 7 0 proc 70 91K 140K 78643K 971 0 subproc 104 6K 6K 78643K 247 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 78 0 in_multi 81 5K 6K 78643K 673 0 ether_multi 1 0K 0K 78643K 13 0 mrt 1 0K 0K 78643K 16 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 157 705K 705K 78643K 157 0 exec 0 0K 1K 78643K 617 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 8 62K 64K 78643K 10 0 UVM amap 366 140K 141K 78643K 15179 0 UVM aobj 131 4K 4K 78643K 137 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 73 0 NDP 11 0K 1K 78643K 159 0 temp 135 4706K 5722K 78643K 24393 0 kqueue 13 20K 24K 78643K 170 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 120 203 0 200 4 3 1 3 0 8 0 rtentry 112 536 0 452 4 0 4 4 0 8 0 unpcb 144 2941 0 2926 23 17 6 7 0 8 5 syncache 296 10 0 10 2 2 0 1 0 8 0 tcpqe 32 120 0 120 3 3 0 1 0 8 0 tcpcb 776 508 0 503 16 15 1 8 0 8 0 arp 120 41 0 26 1 0 1 1 0 8 0 inpcb 368 1965 0 1828 46 33 13 19 0 8 0 nd6 48 124 0 104 1 0 1 1 0 8 0 pkpcb 40 67 0 67 1 1 0 1 0 8 0 kcovpl 48 19 0 11 1 0 1 1 0 8 0 ppxss 1256 28 0 28 2 2 0 1 0 8 0 pppxif 1448 22 0 22 3 3 0 1 0 8 0 pfstscr 40 3 0 3 1 1 0 1 0 8 0 pffrag 232 5 0 4 1 0 1 1 0 482 0 pffrnode 88 5 0 4 1 0 1 1 0 8 0 pffrent 40 44 0 43 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 pfanchor 1280 635 0 258 38 5 33 37 0 8 0 pfstitem 24 85 0 58 1 0 1 1 0 8 0 pfstkey 120 91 0 64 2 0 2 2 0 8 0 pfstate 384 88 0 61 5 0 5 5 0 8 0 pfrule 1344 21 0 20 2 1 1 2 0 8 0 rttmr 136 6 0 6 2 2 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 2649 0 2279 33 6 27 29 0 8 2 art_table 32 2650 0 2279 4 0 4 4 0 8 0 art_node 16 532 0 458 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 3 1 0 1 1 0 8 0 semupl 112 4 0 4 1 1 0 1 0 8 0 semapl 112 285 0 275 1 0 1 1 0 8 0 shmpl 112 134 0 6 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 3719 0 2276 91 0 91 91 0 8 0 ffsino 272 3719 0 2276 97 0 97 97 0 8 0 nchpl 144 6294 0 4658 63 0 63 63 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 25403 0 25403 2 1 1 2 0 8 1 percpumem 16 104 0 63 1 0 1 1 0 8 0 vcpupl 2048 4 0 0 1 0 1 1 0 8 0 vmpool 568 4 0 0 1 0 1 1 0 8 0 kstatmem 264 104 0 82 2 0 2 2 0 8 0 scsiplug 72 2 0 2 1 1 0 1 0 8 0 scxspl 216 18612 0 18612 10 9 1 8 0 8 1 plimitpl 152 234 0 217 1 0 1 1 0 8 0 sigapl 424 2239 0 2172 9 1 8 8 0 8 0 futexpl 64 16447 0 16443 1 0 1 1 0 8 0 knotepl 120 281 0 0 8 0 8 8 0 8 0 kqueuepl 216 290 0 281 3 2 1 3 0 8 0 pipepl 320 559 0 531 12 8 4 9 0 8 1 fdescpl 496 2201 0 2175 5 1 4 5 0 8 0 filepl 152 17330 0 16958 34 19 15 20 0 8 0 lockfpl 104 510 0 508 2 1 1 2 0 8 0 lockfspl 48 133 0 131 1 0 1 1 0 8 0 sessionpl 144 35 0 18 1 0 1 1 0 8 0 pgrppl 48 40 0 23 1 0 1 1 0 8 0 ucredpl 104 1505 0 1493 1 0 1 1 0 8 0 zombiepl 144 2175 0 2172 1 0 1 1 0 8 0 processpl 1072 2239 0 2172 5 0 5 5 0 8 0 procpl 672 5714 0 5627 11 2 9 9 0 8 0 srpgc 96 18 0 18 3 2 1 1 0 8 1 sosppl 168 21 0 21 3 3 0 1 0 8 0 sockpl 488 5317 0 5162 146 126 20 33 0 8 0 mcl64k 65536 8 0 0 1 0 1 1 0 8 0 mcl16k 16384 8 0 0 1 0 1 1 0 8 0 mcl12k 12288 9 0 0 1 0 1 1 0 8 0 mcl9k 9216 6 0 0 1 0 1 1 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 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 322 0 0 40 0 40 40 0 8 0 mtagpl 96 128 0 0 3 0 3 3 0 8 0 mbufpl 256 1199 0 0 71 0 71 71 0 8 0 bufpl 288 6354 0 144 444 0 444 444 0 8 0 anonpl 24 470495 0 453737 123 11 112 121 0 186 0 amapchunkpl 152 41409 0 40633 39 5 34 35 0 158 0 amappl16 200 5296 0 4793 37 9 28 34 0 8 0 amappl15 192 20 0 19 1 0 1 1 0 8 0 amappl14 184 187 0 174 2 1 1 2 0 8 0 amappl13 176 7 0 7 1 1 0 1 0 8 0 amappl12 168 555 0 553 1 0 1 1 0 8 0 amappl11 160 54 0 40 1 0 1 1 0 8 0 amappl10 152 47 0 35 1 0 1 1 0 8 0 amappl9 144 954 0 953 2 1 1 1 0 8 0 amappl8 136 266 0 188 3 0 3 3 0 8 0 amappl7 128 177 0 150 2 0 2 2 0 8 0 amappl6 120 221 0 206 1 0 1 1 0 8 0 amappl5 112 183 0 174 1 0 1 1 0 8 0 amappl4 104 635 0 600 2 1 1 2 0 8 0 amappl3 96 5980 0 5928 2 0 2 2 0 8 0 amappl2 88 2660 0 2585 3 1 2 3 0 8 0 amappl1 80 52754 0 52009 23 5 18 23 0 8 0 amappl 88 14509 0 14299 7 1 6 6 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 72 136 0 6 3 0 3 3 0 8 0 uaddrrnd 24 2205 0 2175 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2205 0 2175 1 0 1 1 0 8 0 vmmpekpl 168 22561 0 22493 4 0 4 4 0 8 0 vmmpepl 168 213758 0 211080 172 32 140 151 0 357 4 vmsppl 368 2204 0 2175 5 1 4 4 0 8 0 rwobjpl 56 63751 0 55975 114 2 112 112 0 8 1 pdppl 4096 4417 0 4354 213 140 73 77 0 8 10 pvpl 32 984502 0 962360 266 70 196 258 0 265 0 pmappl 248 2204 0 2175 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1060 0 185 25 0 25 25 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff82921ff0) 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:654 comcnputc(800,20) at comcnputc+0x97 sys/dev/ic/com.c:1259 cnputc(20) at cnputc+0x4b sys/dev/cons.c:218 db_putchar(2d) at db_putchar+0x316 db_force_whitespace sys/ddb/db_output.c:102 [inline] db_putchar(2d) at db_putchar+0x316 sys/ddb/db_output.c:153 kprintf() at kprintf+0x20ec sys/kern/subr_prf.c:1064 db_printf(ffffffff826609f8) at db_printf+0x85 sys/kern/subr_prf.c:498 fault(ffffffff8260c274) at fault+0x95 sys/arch/amd64/amd64/trap.c:154 kpageflttrap(ffff80002e47bc30,8) at kpageflttrap+0x2b7 sys/arch/amd64/amd64/trap.c:289 kerntrap(ffff80002e47bc30) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:332 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b fifo_write(ffff80002e47bd30) at fifo_write+0x4e sys/miscfs/fifofs/fifo_vnops.c:271 end trace frame: 0xffff80002e47bda0, count: 0 ddb{0}> trace x86_ipi_db(ffffffff82921ff0) 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:654 comcnputc(800,20) at comcnputc+0x97 sys/dev/ic/com.c:1259 cnputc(20) at cnputc+0x4b sys/dev/cons.c:218 db_putchar(2d) at db_putchar+0x316 db_force_whitespace sys/ddb/db_output.c:102 [inline] db_putchar(2d) at db_putchar+0x316 sys/ddb/db_output.c:153 kprintf() at kprintf+0x20ec sys/kern/subr_prf.c:1064 db_printf(ffffffff826609f8) at db_printf+0x85 sys/kern/subr_prf.c:498 fault(ffffffff8260c274) at fault+0x95 sys/arch/amd64/amd64/trap.c:154 kpageflttrap(ffff80002e47bc30,8) at kpageflttrap+0x2b7 sys/arch/amd64/amd64/trap.c:289 kerntrap(ffff80002e47bc30) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:332 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b fifo_write(ffff80002e47bd30) at fifo_write+0x4e sys/miscfs/fifofs/fifo_vnops.c:271 VOP_WRITE(fffffd807489e1c0,ffff80002e47bde8,3,fffffd807f7d7958) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 ktrwriteraw(ffff8000ffff4540,fffffd807489e1c0,fffffd807f7d7958,ffff80002e47bf68,ffff80002e47bf30) at ktrwriteraw+0x15f sys/kern/kern_ktrace.c:660 ktrpsig(ffff8000ffff4540,b,7385f6339c0,0,2,ffff80002e47c028) at ktrpsig+0x1b6 ktrwrite sys/kern/kern_ktrace.c:603 [inline] ktrpsig(ffff8000ffff4540,b,7385f6339c0,0,2,ffff80002e47c028) at ktrpsig+0x1b6 sys/kern/kern_ktrace.c:293 trapsignal(ffff8000ffff4540,b,6,2,20000000) at trapsignal+0x5c7 sys/kern/kern_sig.c:828 upageflttrap(ffff80002e47c220,20000000) at upageflttrap+0x154 sys/arch/amd64/amd64/trap.c:205 usertrap(ffff80002e47c220) at usertrap+0x1aa sys/arch/amd64/amd64/trap.c:417 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffcbab0, count: -21 ddb{0}> machine ddbcpu 1 Stopped at alltraps_kern_meltdown+0xa6: movl %ebx,%gs:0x540 alltraps_kern_meltdown() at alltraps_kern_meltdown+0xa6 copyout() at copyout+0x53 trapsignal(ffff800027c0d268,b,6,2,20000000) at trapsignal+0x5f9 sys/kern/kern_sig.c:828 upageflttrap(ffff80002e4645f0,20000000) at upageflttrap+0x154 sys/arch/amd64/amd64/trap.c:205 usertrap(ffff80002e4645f0) at usertrap+0x1aa sys/arch/amd64/amd64/trap.c:417 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffd4710, count: 9 ddb{1}> trace alltraps_kern_meltdown() at alltraps_kern_meltdown+0xa6 copyout() at copyout+0x53 trapsignal(ffff800027c0d268,b,6,2,20000000) at trapsignal+0x5f9 sys/kern/kern_sig.c:828 upageflttrap(ffff80002e4645f0,20000000) at upageflttrap+0x154 sys/arch/amd64/amd64/trap.c:205 usertrap(ffff80002e4645f0) at usertrap+0x1aa sys/arch/amd64/amd64/trap.c:417 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffd4710, count: -6