uvm_fault(0xfffffd806b7d9d78, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff812e5928 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80003c4dec30 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff812e5928 Starting stack trace... panic(ffffffff833a4489) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80003c4deb80) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800010fdd000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,81,2000,ffff8000348082b8) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff8000348082b8) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80003c4ded30) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805be0e7f8,81,fffffd80097fb2d8,ffff8000348082b8) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b8915e0,ffff8000348082b8) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b8915e0,ffff8000348082b8) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b8915e0,ffff8000348082b8) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806b8915e0,ffff8000348082b8) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000348082b8) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000348082b8,b,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000348082b8,ffff80003c4df0a0,ffff80003c4deff0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c4df0a0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4df0a0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7db8764db850, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 3 50 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND *434660 34622 0 0x2 0 1 syz-executor 496557 84523 0 0x14000 0x40000200 0 softclock savectx() at savectx+0xae end of kernel end trace frame: 0x7d47dc8777d0, 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(0xfffffd806b7d9d78, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7d47dc8777d0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a2b7ee0 rbx 0 rdx 0 rcx 0xffff80002a2b82b0 rax 0x32 r8 0xffff80002a2b7e10 r9 0x1 r10 0xe540e9cd5ad7b088 r11 0x7a5a3942f7ca8283 r12 0 r13 0 r14 0xffff80002a2b82b0 r15 0 rip 0xffffffff810ef3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a2b7e60 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=434660 pid=34622 tcnt=1 stat=onproc flags process=2 proc=0 runpri=84, usrpri=82, slppri=24, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a2b8d10,0xffff80002a2b9a18 process=0xffff80002a2c2238 user=0xffff80002a2b2000, vmspace=0xfffffd806e3f67b0 estcpu=32, cpticks=204, pctcpu=0.66, user=9, sys=186, intr=9 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 20808 338663 74627 0 3 0x3000 suspend syz-executor 20808 386900 74627 0 2 0x4081000 syz-executor 20808 110818 74627 0 2 0x4081c00 syz-executor 20808 6762 74627 0 3 0x4081000 pipecl syz-executor 87994 152552 26884 0 2 0 syz-executor 87994 296770 26884 0 3 0x4000080 ttyout syz-executor 86287 347809 79791 0 2 0xc80 syz-executor 86287 371275 79791 0 3 0x4000080 sbwait syz-executor 86287 498792 79791 0 3 0x4000080 fsleep syz-executor 73199 22421 33490 0 3 0x3000 suspend syz-executor 73199 240968 33490 0 2 0x4081000 syz-executor 73199 216688 33490 0 2 0x4081c00 syz-executor 28282 343554 81025 0 2 0xc80 syz-executor 28282 7146 81025 0 3 0x4000080 kqsel syz-executor 28282 332658 81025 0 3 0x4000080 lockf syz-executor 28282 109235 81025 0 3 0x4000080 fsleep syz-executor 79791 315711 34622 0 2 0xc82 syz-executor 74627 385837 34622 0 2 0xc82 syz-executor 33490 379112 34622 0 2 0xc82 syz-executor 67903 237672 1 0 3 0x80 nanoslp init 25734 57561 0 0 3 0x14200 acct acct 54137 329876 34622 0 3 0x82 wait syz-executor 94462 112780 34622 0 3 0x82 piperd syz-executor 78050 334111 0 0 3 0x14200 bored sosplice 35494 403512 34622 0 2 0xc82 syz-executor 81025 493445 34622 0 2 0xc82 syz-executor 26884 385951 34622 0 2 0xc82 syz-executor *34622 434660 32450 0 7 0x2 syz-executor 32450 49298 23940 0 3 0x10008a sigsusp ksh 23940 442943 40583 0 3 0x98 kqread sshd-session 40583 487065 36011 0 3 0x92 kqread sshd-session 36011 81492 1 0 3 0x88 kqread sshd 50560 49381 10201 74 3 0x1100092 bpf pflogd 10201 482918 1 0 3 0x80 sbwait pflogd 69834 74372 17223 73 3 0x1100090 kqread syslogd 17223 212956 1 0 3 0x100082 sbwait syslogd 50531 520231 1 0 3 0x100080 kqread resolvd 90695 59419 90356 77 3 0x100092 kqread dhcpleased 53566 220340 90356 77 3 0x100092 kqread dhcpleased 90356 111928 1 0 3 0x80 kqread dhcpleased 63327 397040 0 0 3 0x14200 bored smr 47087 287590 0 0 2 0x14200 zerothread 3395 519207 0 0 3 0x14200 aiodoned aiodoned 50800 2314 0 0 3 0x14200 syncer update 73934 346085 0 0 3 0x14200 cleaner cleaner 6502 181012 0 0 3 0x14200 reaper reaper 67832 495748 0 0 3 0x14200 pgdaemon pagedaemon 63786 298423 0 0 3 0x14200 bored viomb 65208 207460 0 0 3 0x40014200 acpi0 acpi0 2640 221739 0 0 3 0x40014200 idle1 38850 321894 0 0 3 0x14200 bored softnet7 21871 160131 0 0 3 0x14200 bored softnet6 22880 195572 0 0 3 0x14200 bored softnet5 10643 461587 0 0 3 0x14200 bored softnet4 29397 51794 0 0 3 0x14200 bored softnet3 55184 67251 0 0 3 0x14200 bored softnet2 46091 513479 0 0 3 0x14200 bored softnet1 51234 32021 0 0 2 0x14200 softnet0 93241 229535 0 0 2 0x14200 systqmp 36716 4409 0 0 3 0x14200 bored systq 42318 36870 0 0 2 0x14200 softclockmp 84523 496557 0 0 7 0x40014200 softclock 53563 363886 0 0 3 0x40014200 idle0 1 518895 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 20808 (syz-executor) thread 0xffff80003b44dcc8 (386900) exclusive rrwlock inode r = 0 (0xfffffd8075414928) #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+0xa3 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:748 #9 Xsyscall+0x128 Process 73199 (syz-executor) thread 0xffff80003c4f8a98 (240968) exclusive rrwlock inode r = 0 (0xfffffd806d87b688) #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+0xa3 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:748 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10256 11071K 11308K 166960K 12737 0 pcb 18 12K 12K 166960K 303 0 rtable 241 12K 12K 166960K 1023 0 pf 42 19K 67486K 166960K 263 0 ifaddr 45 8K 8K 166960K 176 0 ifgroup 63 2K 3K 166960K 301 0 sysctl 4 1K 9K 166960K 26 0 counters 72 37K 38K 166960K 336 0 ioctlops 0 0K 4K 166960K 2005 0 iov 0 0K 32K 166960K 169 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1396 88K 88K 166960K 2980 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 24K 32K 166960K 27 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 76 0 dirhash 12 2K 2K 166960K 39 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 236K 166960K 2084 0 sigio 1 0K 0K 166960K 100 0 proc 63 99K 164K 166960K 940 0 subproc 72 4K 4K 166960K 128 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 660 0 in_multi 99 7K 7K 166960K 247 0 ether_multi 1 0K 0K 166960K 15 0 mrt 1 0K 0K 166960K 8 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 217 970K 970K 166960K 217 0 exec 0 0K 1K 166960K 816 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 259 177K 193K 166960K 20748 0 UVM aobj 13 2K 2K 166960K 14 0 pinsyscall 41 82K 106K 166960K 3350 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 106 0 NDP 14 0K 1K 166960K 131 0 temp 77 8652K 8902K 166960K 97806 0 kqueue 13 20K 30K 166960K 364 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 120 202 0 199 2 1 1 2 0 8 0 rtentry 176 388 0 294 5 0 5 5 0 8 0 unpcb 144 1545 0 1526 13 7 6 6 0 8 5 syncache 336 13 0 13 6 5 1 1 0 8 1 tcpqe 32 6 0 6 3 3 0 1 0 8 0 tcpcb 736 771 0 758 16 8 8 8 0 8 6 arp 128 85 0 75 1 0 1 1 0 8 0 inpcb 328 2136 0 2111 20 12 8 8 0 8 5 nd6 144 40 0 17 1 0 1 1 0 8 0 pkpcb 40 13 0 13 4 3 1 1 0 8 1 kcovpl 48 14 0 6 1 0 1 1 0 8 0 mppekey 1024 3 0 3 2 1 1 1 0 8 1 ppxss 1192 109 0 109 3 2 1 1 0 8 1 pppxif 1504 8 0 8 3 2 1 1 0 8 1 pfstscr 40 4 0 3 1 0 1 1 0 8 0 pffrag 232 11 0 2 1 0 1 1 0 482 0 pffrnode 88 9 0 1 1 0 1 1 0 8 0 pffrent 40 15 0 5 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 24 148 0 45 1 0 1 1 0 8 0 pfstkey 128 161 0 58 4 0 4 4 0 8 0 pfstate 384 154 0 52 11 0 11 11 0 8 0 pfrule 1344 27 0 21 2 1 1 2 0 8 0 art_heap8 4096 4 0 2 3 1 2 3 0 8 0 art_heap4 256 1288 0 813 53 23 30 42 0 8 0 art_table 40 1292 0 815 7 1 6 7 0 8 0 art_node 32 388 0 307 3 1 2 3 0 8 0 sysvmsgpl 40 6 0 4 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 72 0 62 1 0 1 1 0 8 0 shmpl 112 11 0 1 1 0 1 1 0 8 0 dirhash 1024 35 0 18 3 0 3 3 0 8 0 dino2pl 256 5320 0 3793 96 0 96 96 0 8 0 ffsino 296 5320 0 3793 118 0 118 118 0 8 0 nchpl 144 8109 0 6398 64 0 64 64 0 8 0 rtmask 32 23 0 23 3 2 1 1 0 8 1 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 28613 0 28613 2 1 1 2 0 8 1 percpumem 16 183 0 132 1 0 1 1 0 8 0 kstatmem 264 212 0 178 3 0 3 3 0 8 0 scsiplug 72 8 0 8 4 4 0 1 0 8 0 scxspl 216 55550 0 55550 15 13 2 8 1 8 2 plimitpl 152 480 0 462 1 0 1 1 0 8 0 sigapl 424 2388 0 2333 9 1 8 9 0 8 0 knotepl 120 599 0 0 17 0 17 17 0 8 0 kqueuepl 224 1022 0 1012 14 9 5 5 0 8 4 pipepl 344 300 0 271 3 0 3 3 0 8 0 fdescpl 528 2338 0 2307 3 0 3 3 0 8 0 filepl 160 15763 0 15492 30 13 17 18 0 8 5 lockfpl 104 660 0 655 1 0 1 1 0 8 0 lockfspl 48 253 0 249 1 0 1 1 0 8 0 sessionpl 144 40 0 32 1 0 1 1 0 8 0 pgrppl 48 85 0 69 1 0 1 1 0 8 0 ucredpl 104 2794 0 2780 1 0 1 1 0 8 0 zombiepl 144 3038 0 3034 2 1 1 1 0 8 0 processpl 1248 2388 0 2333 6 0 6 6 0 8 0 procpl 664 5750 0 5684 9 2 7 9 0 8 0 sosppl 168 14 0 14 5 4 1 1 0 8 1 sockpl 752 3989 0 3942 33 19 14 18 0 8 8 mcl64k 65536 31 0 0 4 0 4 4 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 114 0 0 14 0 14 14 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 62 0 0 6 0 6 6 0 8 0 mtagpl 96 6 0 0 1 0 1 1 0 8 0 mbufpl 256 1331 0 0 81 0 81 81 0 8 0 bufpl 280 22755 0 16612 440 1 439 440 0 8 0 anonpl 32 11701 0 0 95 0 95 95 0 246 0 amapchunkpl 152 70787 0 70236 53 24 29 37 0 158 4 amappl16 200 8340 0 8244 55 39 16 24 0 8 6 amappl15 192 10 0 9 1 0 1 1 0 8 0 amappl14 184 145 0 134 1 0 1 1 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 3083 0 3053 3 1 2 2 0 8 0 amappl11 160 56 0 42 1 0 1 1 0 8 0 amappl10 152 2 0 2 1 1 0 1 0 8 0 amappl9 144 248 0 247 2 1 1 1 0 8 0 amappl8 136 25 0 23 1 0 1 1 0 8 0 amappl7 128 133 0 121 1 0 1 1 0 8 0 amappl6 120 267 0 263 1 0 1 1 0 8 0 amappl5 112 151 0 139 1 0 1 1 0 8 0 amappl4 104 342 0 324 1 0 1 1 0 8 0 amappl3 96 14486 0 14362 4 0 4 4 0 8 0 amappl2 88 822 0 758 2 0 2 2 0 8 0 amappl1 80 19013 0 18435 16 1 15 15 0 8 0 amappl 88 19574 0 19388 5 0 5 5 0 92 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 9 0 9 4 4 0 1 0 8 0 dma128 128 258 0 258 4 4 0 1 0 8 0 dma64 64 9 0 9 3 2 1 1 0 8 1 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 21 0 20 1 0 1 1 0 8 0 aobjpl 72 13 0 1 1 0 1 1 0 8 0 uaddrrnd 24 2338 0 2307 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2338 0 2307 1 0 1 1 0 8 0 vmmpekpl 168 19749 0 19692 3 0 3 3 0 8 0 vmmpepl 168 154787 0 152709 131 26 105 109 0 357 6 vmsppl 488 2337 0 2307 6 1 5 5 0 8 0 rwobjpl 80 48466 0 41527 147 0 147 147 0 8 1 pdppl 4096 4684 0 4614 118 44 74 84 0 8 4 pvpl 32 21713 0 0 175 0 175 175 0 265 0 pmappl 256 2337 0 2307 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 415 0 88 10 0 10 10 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8378dff0) 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(ffffffff839b7968) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839b7968) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xb kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xb sys/dev/kcov.c:153 __mp_acquire_count(ffffffff839b7968,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:367 softclock_thread_run(ffffffff837bb7b8) at softclock_thread_run+0x79 sys/kern/kern_timeout.c:836 softclock_thread(ffff8000fffff4c0) at softclock_thread+0x10a sys/kern/kern_timeout.c:858 end trace frame: 0x0, count: 3 ddb{0}> trace x86_ipi_db(ffffffff8378dff0) 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(ffffffff839b7968) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff839b7968) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xb kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xb sys/dev/kcov.c:153 __mp_acquire_count(ffffffff839b7968,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:367 softclock_thread_run(ffffffff837bb7b8) at softclock_thread_run+0x79 sys/kern/kern_timeout.c:836 softclock_thread(ffff8000fffff4c0) at softclock_thread+0x10a sys/kern/kern_timeout.c:858 end trace frame: 0x0, count: -12 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x7d47dc8777d0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7d47dc8777d0, count: -1