uvm_fault(0xfffffd805a294038, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff82e2f5c8 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80002ebd4ef0 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff82e2f5c8 Starting stack trace... panic(ffffffff833a2ff5) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80002ebd4e40) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff80000148f000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(21e5f,81,2000,ffff80003c438558) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,81,2000,ffff80003c438558) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80002ebd4ff0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80596e3b10,81,fffffd80097fb7b8,ffff80003c438558) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8059b83470,ffff80003c438558) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8059b83470,ffff80003c438558) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8059b83470,ffff80003c438558) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8059b83470,ffff80003c438558) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c438558) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c438558,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c438558,ffff80002ebd5360,ffff80002ebd52b0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002ebd5360) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002ebd5360) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7c7ee38aa5a0, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 2 1469998197 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 191082 24791 0 0x2 0x1 0 syz-executor *195815 31649 0 0x2 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x75067d976c00, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xfffffd805a294038, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x75067d976c00, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a3161c0 rbx 0 rdx 0 rcx 0xffff80002a272540 rax 0x3a r8 0xffff80002a3160f0 r9 0x1 r10 0x9b528b2696c7cc63 r11 0x3c7f3a764ee32d45 r12 0 r13 0 r14 0xffff80002a272540 r15 0 rip 0xffffffff8202d3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a316140 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=195815 pid=31649 tcnt=1 stat=onproc flags process=2 proc=0 runpri=50, usrpri=50, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffffdc90,0xffff80002a273ca8 process=0xffff8000ffff3030 user=0xffff80002a311000, vmspace=0xfffffd800b0275b8 estcpu=36, cpticks=113, pctcpu=0.30, user=2, sys=109, intr=2 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 79962 323375 31649 0 2 0 syz-executor 87084 283186 83338 0 2 0 syz-executor 87084 364815 83338 0 3 0x4000080 fsleep syz-executor 47874 283510 22126 0 3 0x80 nanoslp syz-executor 47874 435754 22126 0 3 0x4000080 sbwait syz-executor 47874 387975 22126 0 3 0x4000080 fsleep syz-executor 76858 182612 23742 0 3 0x80 nanoslp syz-executor 76858 72171 23742 0 3 0x4000080 ttyin syz-executor 96343 393077 91408 0 3 0x80 nanoslp syz-executor 96343 368701 91408 0 3 0x4000080 sbwait syz-executor 96343 67305 91408 0 3 0x4000080 fsleep syz-executor 56831 238085 0 0 3 0x14200 acct acct 91408 109943 52882 0 3 0x82 nanoslp syz-executor 20873 176282 52882 0 3 0x82 nanoslp syz-executor 23742 65721 52882 0 3 0x82 nanoslp syz-executor 34992 416897 52882 0 3 0x82 nanoslp syz-executor 5586 238596 0 0 3 0x14280 nfsidl nfsio 61249 224460 0 0 3 0x14280 nfsidl nfsio 59250 319951 0 0 3 0x14280 nfsidl nfsio 5342 263670 0 0 3 0x14280 nfsidl nfsio 88230 24715 0 0 3 0x14280 nfsidl nfsio 61155 97406 0 0 3 0x14280 nfsidl nfsio 33666 59569 0 0 3 0x14280 nfsidl nfsio 84814 475673 0 0 3 0x14280 nfsidl nfsio 63959 37128 0 0 3 0x14280 nfsidl nfsio 2774 189266 0 0 3 0x14280 nfsidl nfsio 116 61626 0 0 3 0x14280 nfsidl nfsio 52162 68539 0 0 3 0x14280 nfsidl nfsio 20354 125447 0 0 3 0x14280 nfsidl nfsio 64252 95075 0 0 3 0x14280 nfsidl nfsio 91634 285330 0 0 3 0x14280 nfsidl nfsio 30721 382600 0 0 3 0x14280 nfsidl nfsio 97280 123124 0 0 3 0x14280 nfsidl nfsio 85961 401704 0 0 3 0x14280 nfsidl nfsio 1492 204754 0 0 3 0x14280 nfsidl nfsio 12430 454156 0 0 3 0x14280 nfsidl nfsio 57701 110805 0 0 3 0x14200 bored sosplice 22126 390316 52882 0 3 0x82 nanoslp syz-executor 24791 191082 52882 0 7 0x3 syz-executor 83338 472018 52882 0 3 0x82 nanoslp syz-executor *31649 195815 52882 0 7 0x2 syz-executor 52882 449809 95599 0 3 0x82 kqread syz-executor 95599 460146 39051 0 3 0x10008a sigsusp ksh 39051 374183 66033 0 3 0x98 kqread sshd-session 66033 360303 66864 0 3 0x92 kqread sshd-session 59168 230988 1 0 3 0x100083 ttyopn getty 66864 250269 1 0 3 0x88 kqread sshd 43339 194127 14601 74 3 0x1100092 bpf pflogd 14601 513848 1 0 3 0x80 sbwait pflogd 44867 471109 5316 73 3 0x1100090 kqread syslogd 5316 247908 1 0 3 0x100082 sbwait syslogd 28779 331246 1 0 3 0x100080 kqread resolvd 45468 288330 55317 77 3 0x100092 kqread dhcpleased 97479 471005 55317 77 3 0x100092 kqread dhcpleased 55317 318971 1 0 3 0x80 kqread dhcpleased 63961 11495 0 0 2 0x40014200 smr 51288 407654 0 0 2 0x14200 zerothread 47112 428030 0 0 3 0x14200 aiodoned aiodoned 67287 366530 0 0 3 0x14200 syncer update 8417 16531 0 0 3 0x14200 cleaner cleaner 55073 400105 0 0 3 0x14200 reaper reaper 30759 280399 0 0 3 0x14200 pgdaemon pagedaemon 8206 157366 0 0 3 0x14200 bored viomb 52271 121859 0 0 3 0x40014200 acpi0 acpi0 34516 433659 0 0 3 0x40014200 idle1 54999 422711 0 0 3 0x14200 bored softnet1 82836 312067 0 0 3 0x14200 netlock softnet0 69611 325869 0 0 2 0x40014200 systqmp 49304 28716 0 0 3 0x14200 bored systq 7733 478759 0 0 3 0x14200 tmoslp softclockmp 78165 249744 0 0 3 0x40014200 tmoslp softclock 75494 165454 0 0 3 0x40014200 idle0 1 6210 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10252 11169K 12348K 166960K 15683 0 pcb 20 15K 16K 166960K 423 0 rtable 182 10K 11K 166960K 647 0 pf 36 18K 67485K 166960K 263 0 ifaddr 36 6K 8K 166960K 157 0 ifgroup 51 2K 2K 166960K 290 0 sysctl 4 1K 9K 166960K 22 0 counters 66 36K 38K 166960K 578 0 ioctlops 0 0K 4K 166960K 1985 0 iov 0 0K 36K 166960K 197 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1518 95K 96K 166960K 3687 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 616K 624K 166960K 25 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 179 0 dirhash 12 2K 2K 166960K 63 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 240K 166960K 2252 0 sigio 0 0K 0K 166960K 172 0 proc 73 115K 164K 166960K 818 0 subproc 72 4K 4K 166960K 108 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 2 0K 0K 166960K 285 0 in_multi 76 5K 7K 166960K 232 0 ether_multi 1 0K 0K 166960K 28 0 mrt 1 0K 0K 166960K 10 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 253 1129K 1129K 166960K 253 0 exec 0 0K 1K 166960K 894 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 12 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 237 159K 183K 166960K 21401 0 UVM aobj 23 2K 2K 166960K 25 0 pinsyscall 42 84K 101K 166960K 3416 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 2 0K 1K 166960K 139 0 NDP 11 0K 1K 166960K 114 0 temp 109 8652K 8732K 166960K 87787 0 kqueue 16 26K 30K 166960K 441 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> 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 120 198 0 194 2 0 2 2 0 8 1 rtentry 176 210 0 142 5 0 5 5 0 8 1 unpcb 144 2087 0 2067 16 8 8 8 0 8 7 syncache 336 10 0 10 5 5 0 1 0 8 0 tcpqe 32 10 0 10 2 2 0 1 0 8 0 tcpcb 736 967 0 962 18 11 7 7 0 8 5 arp 136 19 0 11 1 0 1 1 0 8 0 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 2 0 2 1 1 0 1 0 8 0 inpcb 328 2404 0 2391 20 13 7 7 0 8 5 nd6 152 29 0 15 1 0 1 1 0 8 0 pkpcb 40 29 0 29 5 4 1 1 0 8 1 kcovpl 48 12 0 4 1 0 1 1 0 8 0 mppekey 1024 2 0 2 2 2 0 1 0 8 0 ppxss 1192 226 0 226 3 2 1 1 0 8 1 pppxif 1504 11 0 11 4 3 1 1 0 8 1 pfstscr 40 2 0 1 1 0 1 1 0 8 0 pffrag 232 22 0 9 1 0 1 1 0 482 0 pffrnode 88 18 0 6 1 0 1 1 0 8 0 pffrent 40 51 0 36 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 2 0 2 2 2 0 1 0 8 0 pfanchor 1288 2 0 0 1 0 1 1 0 8 0 pftag 88 1 0 1 1 1 0 1 0 8 0 pfstitem 24 105 0 26 1 0 1 1 0 8 0 pfstkey 128 107 0 29 3 0 3 3 0 8 0 pfstate 384 105 0 27 8 0 8 8 0 8 0 pfrule 1344 28 0 22 2 0 2 2 0 8 0 rttmr 136 2 0 2 2 2 0 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 914 0 566 33 6 27 28 0 8 1 art_table 40 917 0 566 5 0 5 5 0 8 0 art_node 32 206 0 149 1 0 1 1 0 8 0 sysvmsgpl 40 9 0 8 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 175 0 165 1 0 1 1 0 8 0 shmpl 112 22 0 2 1 0 1 1 0 8 0 dirhash 1024 52 0 35 3 0 3 3 0 8 0 dino2pl 256 5595 0 4080 95 0 95 95 0 8 0 ffsino 296 5595 0 4080 117 0 117 117 0 8 0 nchpl 144 8679 0 6972 64 0 64 64 0 8 0 rtmask 32 17 0 17 4 3 1 1 0 8 1 uvmvnodes 80 4289 0 0 88 0 88 88 0 8 0 vnodes 216 4289 0 0 239 0 239 239 0 8 0 namei 1024 31385 0 31385 5 4 1 2 0 8 1 percpumem 16 304 0 256 1 0 1 1 0 8 0 kstatmem 264 184 0 158 5 2 3 3 0 8 0 scsiplug 72 8 0 8 3 2 1 1 0 8 1 scxspl 216 56108 0 56108 17 16 1 8 1 8 1 plimitpl 152 670 0 651 1 0 1 1 0 8 0 sigapl 424 2531 0 2462 9 1 8 8 0 8 0 knotepl 120 576 0 0 17 0 17 17 0 8 0 kqueuepl 224 974 0 961 12 7 5 5 0 8 4 pipepl 344 513 0 484 15 9 6 9 0 8 3 fdescpl 528 2479 0 2448 3 0 3 3 0 8 0 filepl 160 18940 0 18704 41 20 21 23 0 8 8 lockfpl 104 1341 0 1339 3 2 1 2 0 8 0 lockfspl 48 423 0 421 1 0 1 1 0 8 0 sessionpl 144 31 0 22 1 0 1 1 0 8 0 pgrppl 48 79 0 62 1 0 1 1 0 8 0 ucredpl 104 3092 0 3078 1 0 1 1 0 8 0 zombiepl 144 2464 0 2462 2 1 1 1 0 8 0 processpl 1232 2531 0 2462 6 0 6 6 0 8 0 procpl 664 6081 0 6006 9 1 8 8 0 8 0 sosppl 168 13 0 13 3 3 0 1 0 8 0 sockpl 752 4773 0 4736 55 42 13 28 0 8 8 mcl64k 65536 16 0 0 2 0 2 2 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 120 0 0 15 0 15 15 0 8 0 mcl2k 2048 37 0 0 4 0 4 4 0 8 0 mtagpl 96 12 0 0 1 0 1 1 0 8 0 mbufpl 256 1174 0 0 72 0 72 72 0 8 0 bufpl 280 24046 0 17903 440 0 440 440 0 8 1 anonpl 32 13575 0 0 110 0 110 110 0 246 0 amapchunkpl 152 74436 0 73944 50 21 29 35 0 158 3 amappl16 200 8979 0 8943 91 63 28 28 0 8 19 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 136 0 124 1 0 1 1 0 8 0 amappl13 176 10 0 10 1 1 0 1 0 8 0 amappl12 168 3194 0 3164 3 1 2 2 0 8 0 amappl11 160 52 0 38 1 0 1 1 0 8 0 amappl10 152 10 0 10 1 1 0 1 0 8 0 amappl9 144 249 0 249 1 1 0 1 0 8 0 amappl8 136 25 0 23 1 0 1 1 0 8 0 amappl7 128 149 0 136 1 0 1 1 0 8 0 amappl6 120 226 0 222 1 0 1 1 0 8 0 amappl5 112 140 0 130 1 0 1 1 0 8 0 amappl4 104 320 0 300 1 0 1 1 0 8 0 amappl3 96 13209 0 13110 3 0 3 3 0 8 0 amappl2 88 2755 0 2676 2 0 2 2 0 8 0 amappl1 80 17972 0 17373 16 1 15 15 0 8 0 amappl 88 20288 0 20122 5 0 5 5 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 8 0 8 3 3 0 1 0 8 0 dma128 128 256 0 256 2 1 1 1 0 8 1 dma64 64 7 0 7 2 2 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 2 1 0 1 1 0 8 0 uaddrrnd 24 2479 0 2448 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2479 0 2448 1 0 1 1 0 8 0 vmmpekpl 168 20844 0 20788 3 0 3 3 0 8 0 vmmpepl 168 160900 0 158899 134 21 113 113 0 357 12 vmsppl 488 2478 0 2448 8 3 5 5 0 8 0 rwobjpl 80 46706 0 41444 117 1 116 116 0 8 0 pdppl 4096 4966 0 4896 116 44 72 84 0 8 2 pvpl 32 24749 0 0 199 0 199 199 0 265 0 pmappl 256 2478 0 2448 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 384 0 77 9 0 9 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83777ff0) 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 __mp_lock(ffffffff838b3e90) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838b3e90) at __mp_lock+0x192 sys/kern/kern_lock.c:165 intr_handler(ffff80002a3706f0,ffff800000069c00) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff838b3e90) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838b3e90) at __mp_lock+0x199 sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff838b3e90) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838b3e90) at __mp_lock+0x192 sys/kern/kern_lock.c:165 ktrsysret(ffff8000fffef240,63,0,ffff80002a370a70) at ktrsysret+0xde ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff8000fffef240,63,0,ffff80002a370a70) at ktrsysret+0xde sys/kern/kern_ktrace.c:209 syscall(ffff80002a370b20) at syscall+0xa50 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a370b20) at syscall+0xa50 sys/arch/amd64/amd64/trap.c:767 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e6ea06a9320, count: 1 ddb{0}> trace x86_ipi_db(ffffffff83777ff0) 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 __mp_lock(ffffffff838b3e90) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838b3e90) at __mp_lock+0x192 sys/kern/kern_lock.c:165 intr_handler(ffff80002a3706f0,ffff800000069c00) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff838b3e90) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838b3e90) at __mp_lock+0x199 sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff838b3e90) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838b3e90) at __mp_lock+0x192 sys/kern/kern_lock.c:165 ktrsysret(ffff8000fffef240,63,0,ffff80002a370a70) at ktrsysret+0xde ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff8000fffef240,63,0,ffff80002a370a70) at ktrsysret+0xde sys/kern/kern_ktrace.c:209 syscall(ffff80002a370b20) at syscall+0xa50 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a370b20) at syscall+0xa50 sys/arch/amd64/amd64/trap.c:767 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7e6ea06a9320, count: -14 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x75067d976c00, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x75067d976c00, count: -1