uvm_fault(0xfffffd806ca5f5d0, 0x0, 0, 1) -> e kernel: page fault trap, code=0 Stopped at dt_ioctl_record_stop+0x108: movq 0(%r14),%r14 TID PID UID PRFLAGS PFLAGS CPU COMMAND 238870 60527 0 0 0 1 syz-executor dt_ioctl_record_stop(ffff80000162a000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(11e5f,1,2000,ffff80002a260018) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,1,2000,ffff80002a260018) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80003c43ad80) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805fc1bc00,1,fffffd80097fd478,ffff80002a260018) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806ca18180,ffff80002a260018) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806ca18180,ffff80002a260018) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806ca18180,ffff80002a260018) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806ca18180,ffff80002a260018) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80002a260018) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80002a260018,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002a260018,ffff80003c43b0f0,ffff80003c43b040) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c43b0f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c43b0f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x79cd31ff77e0, count: 3 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 *cpu0: uvm_fault(0xfffffd806ca5f5d0, 0x0, 0, 1) -> e ddb{0}> trace dt_ioctl_record_stop(ffff80000162a000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(11e5f,1,2000,ffff80002a260018) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,1,2000,ffff80002a260018) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80003c43ad80) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805fc1bc00,1,fffffd80097fd478,ffff80002a260018) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806ca18180,ffff80002a260018) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806ca18180,ffff80002a260018) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806ca18180,ffff80002a260018) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806ca18180,ffff80002a260018) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80002a260018) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80002a260018,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002a260018,ffff80003c43b0f0,ffff80003c43b040) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c43b0f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c43b0f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x79cd31ff77e0, count: -12 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80003c43acb0 rbx 0x1 rdx 0 rcx 0xffff80002a260018 rax 0xffffffff837efa28 dt_prov_syscall r8 0x2 r9 0 r10 0xabc7dbaf72165405 r11 0x2a523b247ca67c5e r12 0 r13 0 r14 0 r15 0xffff8000015e5f00 rip 0xffffffff8163e348 dt_ioctl_record_stop+0x108 cs 0x8 rflags 0x10207 __ALIGN_SIZE+0xf207 rsp 0xffff80003c43ac80 ss 0x10 dt_ioctl_record_stop+0x108: movq 0(%r14),%r14 ddb{0}> show proc PROC (syz-executor) tid=520061 pid=75870 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80002a260018 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80002a261a08,0xffff80002a261cb0 process=0xffff8000393ddd00 user=0xffff80003c436000, vmspace=0xfffffd806ca5f5d0 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 60527 238870 94429 0 7 0 syz-executor 60527 280255 94429 0 2 0x4000000 syz-executor 95300 393676 11133 0 2 0 syz-executor 95300 55858 11133 0 3 0x4000000 smrbar syz-executor 39986 193303 64403 0 2 0 syz-executor 39986 254028 64403 0 2 0x4000000 syz-executor 39986 99152 64403 0 3 0x4000000 fltagain2 syz-executor 39986 206873 64403 0 2 0x4000000 syz-executor 41576 267011 76917 0 2 0 syz-executor 41576 144208 76917 0 3 0x4000080 fsleep syz-executor 47399 399695 0 0 3 0x14200 acct acct 94429 120381 39360 0 3 0x82 nanoslp syz-executor 76917 70297 39360 0 3 0x82 nanoslp syz-executor 86225 279650 26447 0 3 0x100082 sbwait arp 26447 307117 3326 0 3 0x10008a sigsusp sh 96611 342839 39360 0 3 0x82 nanoslp syz-executor 72804 294441 39360 0 3 0x82 nanoslp syz-executor 11133 445715 39360 0 3 0x82 nanoslp syz-executor 64403 104075 39360 0 2 0x2 syz-executor 74386 391936 39360 0 3 0x82 nanoslp syz-executor 3326 517864 39360 0 3 0x82 wait syz-executor 39360 24599 20682 0 3 0x82 kqread syz-executor 20682 508048 15017 0 3 0x10008a sigsusp ksh 15017 63875 82918 0 3 0x98 kqread sshd-session 82918 446728 33049 0 3 0x92 kqread sshd-session 71968 351391 1 0 3 0x100083 ttyopn getty 33049 22837 1 0 3 0x88 kqread sshd 87059 50200 79978 74 3 0x1100092 bpf pflogd 79978 68362 1 0 3 0x80 sbwait pflogd 62205 329280 39179 73 3 0x1100090 kqread syslogd 39179 285962 1 0 3 0x100082 sbwait syslogd 93788 187229 1 0 3 0x100080 kqread resolvd 98106 180806 37999 77 3 0x100092 kqread dhcpleased 35201 145200 37999 77 3 0x100092 kqread dhcpleased 37999 204677 1 0 3 0x80 kqread dhcpleased 20118 96853 0 0 2 0x40014200 smr 86517 94061 0 0 2 0x14200 zerothread 46799 415686 0 0 3 0x14200 aiodoned aiodoned 20446 521589 0 0 3 0x14200 syncer update 77711 248916 0 0 3 0x14200 cleaner cleaner 24959 284869 0 0 3 0x14200 reaper reaper 24890 107549 0 0 3 0x14200 pgdaemon pagedaemon 12433 382014 0 0 3 0x14200 bored viomb 70872 367273 0 0 3 0x40014200 acpi0 acpi0 48589 154980 0 0 3 0x40014200 idle1 50735 13805 0 0 3 0x14200 bored softnet1 38535 468992 0 0 3 0x14200 bored softnet0 18845 392755 0 0 3 0x14200 smrbar systqmp 89232 19719 0 0 3 0x14200 bored systq 81144 138701 0 0 3 0x14200 tmoslp softclockmp 24679 242671 0 0 3 0x40014200 tmoslp softclock 70469 379772 0 0 3 0x40014200 idle0 1 120221 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks Process 95300 (syz-executor) thread 0xffff80003c430030 (55858) exclusive rwlock clonelk r = 0 (0xffffffff837d9a78) #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 if_clone_destroy+0x93 sys/net/if.c:-1 #3 ifioctl+0x59d sys/net/if.c:2159 #4 sys_ioctl+0x674 sys/kern/sys_generic.c:-1 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #6 Xsyscall+0x128 Process 39986 (syz-executor) thread 0xffff80003c430d28 (254028) exclusive rrwlock inode r = 0 (0xfffffd806e97d928) #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:570 #5 vn_write+0x18f sys/kern/vfs_vnops.c:405 #6 dofilewritev+0x242 sys/kern/sys_generic.c:380 #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:775 #9 Xsyscall+0x128 Process 39986 (syz-executor) thread 0xffff80002a2607e0 (99152) exclusive rwlock sbufsnd r = 0 (0xffff80000161dd18) #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 sblock+0xb6 sys/kern/uipc_socket2.c:536 #3 sosend+0x2e9 sys/kern/uipc_socket.c:639 #4 dofilewritev+0x242 sys/kern/sys_generic.c:380 #5 sys_write+0xa2 sys/kern/sys_generic.c:300 #6 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #7 Xsyscall+0x128 Process 18845 (systqmp) thread 0xffff8000ffffe530 (392755) shared rwlock systqmp r = 0 (0xffffffff8385a508) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 taskq_thread+0x12a sys/kern/kern_task.c:442 #2 proc_trampoline+0x10 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11092 12252K 12294K 166960K 12811 0 pcb 18 14K 16K 166960K 369 0 rtable 183 8K 9K 166960K 533 0 pf 39 18K 22K 166960K 191 0 ifaddr 36 6K 7K 166960K 93 0 ifgroup 59 2K 2K 166960K 145 0 sysctl 4 1K 9K 166960K 45 0 counters 72 37K 38K 166960K 178 0 ioctlops 0 0K 4K 166960K 1761 0 iov 0 0K 24K 166960K 117 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1462 92K 92K 166960K 2086 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 13 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 30 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 19 69K 89K 166960K 926 0 sigio 0 0K 0K 166960K 12 0 proc 75 131K 180K 166960K 690 0 subproc 72 4K 4K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 152 0 in_multi 64 4K 6K 166960K 148 0 ether_multi 1 0K 0K 166960K 7 0 mrt 0 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 91 413K 413K 166960K 91 0 exec 0 0K 1K 166960K 561 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 254 170K 176K 166960K 10476 0 UVM aobj 24 10K 10K 166960K 25 0 pinsyscall 45 90K 104K 166960K 2118 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 78 0 NDP 13 0K 2K 166960K 64 0 temp 65 8680K 8756K 166960K 56061 0 kqueue 13 20K 29K 166960K 182 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 26 0 0 1 0 1 1 0 8 0 rtpcb 120 120 0 116 2 0 2 2 0 8 1 rtentry 176 159 0 88 5 0 5 5 0 8 0 unpcb 144 599 0 580 7 5 2 4 0 8 1 syncache 336 4 0 4 2 2 0 1 0 8 0 tcpcb 736 266 0 262 7 6 1 4 0 8 0 arp 136 30 0 15 1 0 1 1 0 8 0 inpcb 328 1143 0 1132 16 9 7 7 0 8 6 nd6 152 31 0 16 1 0 1 1 0 8 0 pkpcb 40 10 0 10 5 4 1 1 0 8 1 kcovpl 48 10 0 2 1 0 1 1 0 8 0 mppekey 1024 1 0 1 1 1 0 1 0 8 0 ppxss 1192 46 0 46 3 2 1 1 0 8 1 pppxif 1504 3 0 3 1 1 0 1 0 8 0 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 32 0 20 1 0 1 1 0 482 0 pffrnode 88 13 0 2 1 0 1 1 0 8 0 pffrent 40 53 0 41 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 4 0 0 1 0 1 1 0 8 0 pfstkey 128 8 0 4 1 0 1 1 0 8 0 pfstate 448 4 0 2 1 0 1 1 0 8 0 pfrule 1360 4 0 4 1 1 0 1 0 8 0 art_heap8 4096 3 0 1 3 1 2 2 0 8 0 art_heap4 256 625 0 329 29 4 25 28 0 8 2 art_table 40 628 0 330 5 0 5 5 0 8 0 art_node 32 158 0 97 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 9 2 1 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 26 0 16 1 0 1 1 0 8 0 shmpl 112 19 0 1 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 3175 0 1660 96 0 96 96 0 8 0 ffsino 296 3175 0 1660 118 0 118 118 0 8 0 nchpl 144 4517 0 2804 64 0 64 64 0 8 0 rtmask 32 11 0 11 3 2 1 1 0 8 1 vnodes 216 3622 0 0 202 0 202 202 0 8 0 namei 1024 14929 0 14929 3 2 1 1 0 8 1 percpumem 16 104 0 53 1 0 1 1 0 8 0 vcpupl 3968 3 0 0 1 0 1 1 0 8 0 vmpool 848 3 0 0 1 0 1 1 0 8 0 kstatmem 264 92 0 62 5 2 3 3 0 8 1 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 5 0 5 4 3 1 1 0 8 1 scxspl 216 25884 0 25884 12 9 3 8 1 8 3 plimitpl 152 436 0 417 2 1 1 2 0 8 0 sigapl 424 1239 0 1189 7 1 6 7 0 8 0 knotepl 120 575 0 0 18 0 18 18 0 8 0 kqueuepl 224 277 0 266 2 1 1 2 0 8 0 pipepl 344 198 0 171 3 0 3 3 0 8 0 fdescpl 528 1221 0 1188 3 0 3 3 0 8 0 filepl 160 7580 0 7355 21 7 14 14 0 8 3 lockfpl 104 576 0 574 2 1 1 2 0 8 0 lockfspl 48 203 0 201 1 0 1 1 0 8 0 sessionpl 144 25 0 16 1 0 1 1 0 8 0 pgrppl 48 45 0 28 1 0 1 1 0 8 0 ucredpl 104 1110 0 1096 1 0 1 1 0 8 0 zombiepl 144 1448 0 1445 1 0 1 1 0 8 0 processpl 1232 1239 0 1189 5 0 5 5 0 8 0 procpl 664 2667 0 2611 7 1 6 6 0 8 0 sosppl 176 10 0 10 3 2 1 1 0 8 1 sockpl 752 1901 0 1867 26 15 11 12 0 8 7 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 6 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 130 0 0 17 0 17 17 0 8 0 mcl2k 2048 44 0 0 4 0 4 4 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 248 0 0 15 0 15 15 0 8 0 bufpl 280 10055 0 3919 439 0 439 439 0 8 0 anonpl 32 13395 0 0 108 0 108 108 0 246 0 amapchunkpl 152 35074 0 34580 47 12 35 35 0 158 13 amappl16 200 4667 0 4637 40 25 15 24 0 8 10 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 16 0 16 1 1 0 1 0 8 0 amappl13 176 454 0 452 1 0 1 1 0 8 0 amappl12 168 1600 0 1554 3 0 3 3 0 8 0 amappl11 160 5 0 5 1 1 0 1 0 8 0 amappl10 152 77 0 62 1 0 1 1 0 8 0 amappl9 144 254 0 254 1 1 0 1 0 8 0 amappl8 136 22 0 20 1 0 1 1 0 8 0 amappl7 128 86 0 85 1 0 1 1 0 8 0 amappl6 120 304 0 289 1 0 1 1 0 8 0 amappl5 112 78 0 67 1 0 1 1 0 8 0 amappl4 104 437 0 404 1 0 1 1 0 8 0 amappl3 96 6069 0 5976 5 2 3 4 0 8 0 amappl2 88 1343 0 1263 2 0 2 2 0 8 0 amappl1 80 12712 0 12096 16 1 15 15 0 8 0 amappl 88 9577 0 9408 6 1 5 5 0 92 0 uvmvnodes 80 132 0 0 3 0 3 3 0 8 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 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 9 0 9 3 3 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 24 0 1 1 0 1 1 0 8 0 uaddrrnd 24 1221 0 1188 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1221 0 1188 1 0 1 1 0 8 0 vmmpekpl 168 11447 0 11403 4 1 3 3 0 8 0 vmmpepl 168 84366 0 82360 116 11 105 108 0 357 12 vmsppl 488 1220 0 1188 5 0 5 5 0 8 0 rwobjpl 80 25337 0 24215 35 6 29 32 0 8 1 pdppl 4096 2455 0 2379 116 40 76 83 0 8 0 pvpl 32 25697 0 0 207 0 207 207 0 265 0 pmappl 256 1223 0 1188 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 307 0 59 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace dt_ioctl_record_stop(ffff80000162a000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(11e5f,1,2000,ffff80002a260018) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,1,2000,ffff80002a260018) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80003c43ad80) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805fc1bc00,1,fffffd80097fd478,ffff80002a260018) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806ca18180,ffff80002a260018) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806ca18180,ffff80002a260018) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806ca18180,ffff80002a260018) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806ca18180,ffff80002a260018) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80002a260018) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80002a260018,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80002a260018,ffff80003c43b0f0,ffff80003c43b040) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c43b0f0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c43b0f0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x79cd31ff77e0, count: -12 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299ddff0) 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 end of kernel end trace frame: 0x708bfd587df0, count: 12 ddb{1}> trace x86_ipi_db(ffff8000299ddff0) 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 end of kernel end trace frame: 0x708bfd587df0, count: -3