gj|E1\:w&ORX2ERqT)3Bf5)8!1K/bH@}7k0xdM\dMZACZ=j7+(k" ;)ZܿubdyU&uF W5aké=Uhuvm_fault(0xfffffd80677afb90, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff82e50388 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80002ebfbaa0 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff82e50388 Starting stack trace... panic(ffffffff833a774a) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80002ebfb9f0) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff80000147d000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(31e5f,81,2000,ffff80003802aa88) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(31e5f,81,2000,ffff80003802aa88) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80002ebfbba0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd80676547c0,81,fffffd80097fb5b0,ffff80003802aa88) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806b9559b8,ffff80003802aa88) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806b9559b8,ffff80003802aa88) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806b9559b8,ffff80003802aa88) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806b9559b8,ffff80003802aa88) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003802aa88) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003802aa88,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003802aa88,ffff80002ebfbf10,ffff80002ebfbe60) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002ebfbf10) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002ebfbf10) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x705d447b7600, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 2 521565301 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 522398 34662 0 0 0x1 0 syz-executor *490624 75713 0 0x2 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x75ac4767afa0, 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}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: uvm_fault(0xfffffd80677afb90, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x75ac4767afa0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a341560 rbx 0 rdx 0 rcx 0xffff80002a2b94d8 rax 0x39 r8 0xffff80002a341490 r9 0x1 r10 0x4c7de5732bb185cc r11 0x61b0eb2cb62f6b26 r12 0 r13 0 r14 0xffff80002a2b94d8 r15 0 rip 0xffffffff813283ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a3414e0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=490624 pid=75713 tcnt=1 stat=onproc flags process=2 proc=0 runpri=86, usrpri=86, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a2b82b0,0xffff80002a2b9780 process=0xffff80002a2c0e88 user=0xffff80002a33c000, vmspace=0xfffffd800b0271e8 estcpu=36, cpticks=65, pctcpu=0.35, user=0, sys=62, intr=2 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 47957 279245 76983 0 2 0 syz-executor 34662 522398 75713 0 7 0x1 syz-executor 11498 502949 25672 0 3 0x80 nanoslp syz-executor 11498 476930 25672 0 3 0x4000080 kqsel syz-executor 11498 218980 25672 0 3 0x4000080 fsleep syz-executor 55840 481940 51584 0 3 0x80 nanoslp syz-executor 55840 502455 51584 0 3 0x4000080 kqsel syz-executor 55840 194012 51584 0 3 0x4000080 fsleep syz-executor 55840 484311 51584 0 3 0x4000080 fsleep syz-executor 6579 20517 25916 60929 3 0x90 nanoslp syz-executor 6579 160835 25916 60929 3 0x4000090 sbwait syz-executor 70114 353372 0 0 3 0x14200 bored sosplice 51584 297386 35793 0 3 0x82 nanoslp syz-executor 25672 83554 35793 0 3 0x82 nanoslp syz-executor 70766 14519 35793 0 3 0x82 nanoslp syz-executor 94720 70355 35793 0 3 0x82 nanoslp syz-executor 25916 418347 35793 0 3 0x82 nanoslp syz-executor 76983 477304 35793 0 3 0x82 nanoslp syz-executor *75713 490624 35793 0 7 0x2 syz-executor 2529 230873 35793 0 3 0x82 nanoslp syz-executor 35793 251089 79658 0 3 0x82 kqread syz-executor 79658 421750 20266 0 3 0x10008a sigsusp ksh 20266 515046 79992 0 3 0x98 kqread sshd-session 79992 75572 70589 0 3 0x92 kqread sshd-session 1160 395418 1 0 3 0x100083 ttyin getty 70589 226937 1 0 3 0x88 kqread sshd 34104 69813 50982 74 3 0x1100092 bpf pflogd 50982 415293 1 0 3 0x80 sbwait pflogd 96778 281281 65092 73 3 0x1100090 kqread syslogd 65092 319563 1 0 3 0x100082 sbwait syslogd 98318 340067 1 0 3 0x100080 kqread resolvd 81319 518152 98608 77 3 0x100092 kqread dhcpleased 79260 427543 98608 77 3 0x100092 kqread dhcpleased 98608 388053 1 0 3 0x80 kqread dhcpleased 22050 337004 0 0 3 0x14200 bored smr 23385 217413 0 0 2 0x14200 zerothread 42487 293526 0 0 3 0x14200 aiodoned aiodoned 94713 376938 0 0 3 0x14200 syncer update 6395 125469 0 0 3 0x14200 cleaner cleaner 19584 402907 0 0 3 0x14200 reaper reaper 52486 385026 0 0 3 0x14200 pgdaemon pagedaemon 75618 383099 0 0 3 0x14200 bored viomb 74805 112441 0 0 3 0x40014200 acpi0 acpi0 65983 281076 0 0 3 0x40014200 idle1 95011 177829 0 0 3 0x14200 bored softnet7 45280 117843 0 0 3 0x14200 bored softnet6 8779 406005 0 0 3 0x14200 bored softnet5 93354 384967 0 0 3 0x14200 bored softnet4 76738 467275 0 0 3 0x14200 bored softnet3 16279 271072 0 0 3 0x14200 bored softnet2 14942 1987 0 0 3 0x14200 bored softnet1 48678 471417 0 0 3 0x14200 netlock softnet0 53523 79906 0 0 2 0x40014200 systqmp 12315 520019 0 0 3 0x14200 bored systq 36092 245135 0 0 3 0x14200 tmoslp softclockmp 242 432779 0 0 3 0x40014200 tmoslp softclock 15264 463303 0 0 3 0x40014200 idle0 1 92331 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 34662 (syz-executor) thread 0xffff80003802bcb0 (522398) exclusive rwlock amaplk r = 0 (0xfffffd806c8cf608) #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 uvm_fault_check+0x597 sys/uvm/uvm_fault.c:862 #3 uvm_fault+0x106 sys/uvm/uvm_fault.c:677 #4 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #5 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:603 #6 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd80677afaa8) #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_read+0x3e8 sys/kern/kern_rwlock.c:413 #2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1924 #3 uvm_fault_check+0x4a sys/uvm/uvm_fault.c:741 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:677 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:603 #7 recall_trap+0x8 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10240 11253K 11253K 166960K 11736 0 pcb 17 13K 14K 166960K 142 0 rtable 190 9K 9K 166960K 439 0 pf 37 18K 25K 166960K 91 0 ifaddr 40 6K 7K 166960K 62 0 ifgroup 59 2K 2K 166960K 100 0 sysctl 3 1K 9K 166960K 11 0 counters 70 37K 37K 166960K 104 0 ioctlops 0 0K 4K 166960K 1647 0 iov 0 0K 16K 166960K 42 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1346 85K 85K 166960K 1881 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 6 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 35 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 771 0 sigio 0 0K 0K 166960K 44 0 proc 72 115K 180K 166960K 605 0 subproc 72 4K 4K 166960K 80 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 64 0 in_multi 85 6K 7K 166960K 115 0 ether_multi 1 0K 0K 166960K 2 0 mrt 1 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 73 334K 334K 166960K 73 0 exec 0 0K 1K 166960K 424 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 233 159K 173K 166960K 8787 0 UVM aobj 16 6K 6K 166960K 17 0 pinsyscall 43 86K 105K 166960K 1876 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 71 0 NDP 13 0K 1K 166960K 43 0 temp 54 8645K 8725K 166960K 39020 0 kqueue 15 22K 30K 166960K 161 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 87 0 84 1 0 1 1 0 8 0 rtentry 176 121 0 43 5 0 5 5 0 8 0 unpcb 144 733 0 713 3 0 3 3 0 8 2 syncache 336 5 0 5 2 1 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 736 261 0 255 7 0 7 7 0 8 6 arp 128 16 0 7 1 0 1 1 0 8 0 inpcb 328 817 0 807 12 2 10 10 0 8 8 nd6 144 20 0 3 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1192 12 0 12 1 0 1 1 0 8 1 pppxif 1504 1 0 1 1 1 0 1 0 8 0 pffrag 232 5 0 0 1 0 1 1 0 482 0 pffrnode 88 5 0 0 1 0 1 1 0 8 0 pffrent 40 5 0 0 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 1288 1 0 0 1 0 1 1 0 8 0 pfstitem 24 75 0 6 1 0 1 1 0 8 0 pfstkey 128 80 0 6 3 0 3 3 0 8 0 pfstate 384 73 0 6 7 0 7 7 0 8 0 pfrule 1344 24 0 19 2 1 1 2 0 8 0 rttmr 136 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 502 0 140 30 1 29 30 0 8 2 art_table 40 504 0 140 5 0 5 5 0 8 0 art_node 32 120 0 57 1 0 1 1 0 8 0 sysvmsgpl 40 5 0 3 1 0 1 1 0 8 0 semapl 112 33 0 23 1 0 1 1 0 8 0 shmpl 112 14 0 1 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 2891 0 1376 95 0 95 95 0 8 0 ffsino 296 2891 0 1376 117 0 117 117 0 8 0 nchpl 144 3952 0 2260 63 0 63 63 0 8 0 rtmask 32 1 0 1 1 1 0 1 0 8 0 uvmvnodes 80 3156 0 0 65 0 65 65 0 8 0 vnodes 216 3156 0 0 176 0 176 176 0 8 0 namei 1024 13518 0 13518 2 1 1 2 0 8 1 percpumem 16 67 0 17 1 0 1 1 0 8 0 kstatmem 264 56 0 26 3 0 3 3 0 8 0 scsiplug 72 2 0 2 1 0 1 1 0 8 1 scxspl 216 20683 0 20683 10 7 3 8 1 8 3 plimitpl 152 191 0 172 1 0 1 1 0 8 0 sigapl 424 1072 0 1017 7 0 7 7 0 8 0 knotepl 120 536 0 0 17 0 17 17 0 8 0 kqueuepl 224 283 0 271 3 2 1 3 0 8 0 pipepl 344 213 0 185 9 4 5 9 0 8 2 fdescpl 528 1049 0 1017 3 0 3 3 0 8 0 filepl 160 6300 0 6071 18 0 18 18 0 8 6 lockfpl 104 182 0 179 1 0 1 1 0 8 0 lockfspl 48 77 0 74 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 36 0 19 1 0 1 1 0 8 0 ucredpl 104 1015 0 1000 1 0 1 1 0 8 0 zombiepl 144 1020 0 1017 1 0 1 1 0 8 0 processpl 1232 1072 0 1017 5 0 5 5 0 8 0 procpl 664 2077 0 2016 7 1 6 7 0 8 0 sosppl 168 15 0 15 1 0 1 1 0 8 1 sockpl 752 1650 0 1617 13 0 13 13 0 8 8 mcl64k 65536 8 0 0 1 0 1 1 0 8 0 mcl16k 16384 12 0 0 2 0 2 2 0 8 0 mcl12k 12288 5 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 7 0 0 1 0 1 1 0 8 0 mcl4k 4096 115 0 0 15 0 15 15 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 57 0 0 8 0 8 8 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 216 0 0 14 0 14 14 0 8 0 bufpl 280 9419 0 3276 439 0 439 439 0 8 0 anonpl 32 12819 0 0 104 0 104 104 0 246 0 amapchunkpl 152 28394 0 27929 32 5 27 28 0 158 7 amappl16 200 4968 0 4937 46 34 12 26 0 8 8 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 117 0 105 1 0 1 1 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 1706 0 1675 4 2 2 3 0 8 0 amappl11 160 54 0 40 1 0 1 1 0 8 0 amappl10 152 7 0 7 1 1 0 1 0 8 0 amappl9 144 247 0 247 1 1 0 1 0 8 0 amappl8 136 28 0 25 1 0 1 1 0 8 0 amappl7 128 126 0 113 1 0 1 1 0 8 0 amappl6 120 269 0 266 1 0 1 1 0 8 0 amappl5 112 121 0 112 1 0 1 1 0 8 0 amappl4 104 323 0 299 1 0 1 1 0 8 0 amappl3 96 4900 0 4809 4 1 3 3 0 8 0 amappl2 88 1301 0 1221 2 0 2 2 0 8 0 amappl1 80 11306 0 10695 15 0 15 15 0 8 0 amappl 88 7977 0 7816 5 0 5 5 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 8 0 8 2 1 1 1 0 8 1 dma128 128 254 0 254 2 2 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 8 0 8 2 2 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 16 0 1 1 0 1 1 0 8 0 uaddrrnd 24 1049 0 1017 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1049 0 1017 1 0 1 1 0 8 0 vmmpekpl 168 9928 0 9891 2 0 2 2 0 8 0 vmmpepl 168 72693 0 70679 112 4 108 112 0 357 11 vmsppl 488 1048 0 1017 5 0 5 5 0 8 1 rwobjpl 80 25602 0 21504 86 0 86 86 0 8 1 pdppl 4096 2106 0 2034 106 34 72 86 0 8 0 pvpl 32 23574 0 0 191 0 191 191 0 265 0 pmappl 256 1048 0 1017 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 295 0 39 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff8377fff0) 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(ffffffff838fa878) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838fa878) at __mp_lock+0x192 sys/kern/kern_lock.c:165 softintr_dispatch(2) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsofttty() at Xsofttty+0x27 __mp_lock(ffffffff838fa878) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838fa878) 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 ktrsyscall(ffff80003802bcb0,53,28,ffff800038031350) at ktrsyscall+0x2c7 ktrwrite sys/kern/kern_ktrace.c:-1 [inline] ktrsyscall(ffff80003802bcb0,53,28,ffff800038031350) at ktrsyscall+0x2c7 sys/kern/kern_ktrace.c:183 syscall(ffff800038031350) at syscall+0x304 mi_syscall sys/sys/syscall_mi.h:154 [inline] syscall(ffff800038031350) at syscall+0x304 sys/arch/amd64/amd64/trap.c:746 end trace frame: 0xffff8000380313d0, count: 0 ddb{0}> trace x86_ipi_db(ffffffff8377fff0) 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(ffffffff838fa878) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838fa878) at __mp_lock+0x192 sys/kern/kern_lock.c:165 softintr_dispatch(2) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsofttty() at Xsofttty+0x27 __mp_lock(ffffffff838fa878) at __mp_lock+0x199 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff838fa878) 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 ktrsyscall(ffff80003802bcb0,53,28,ffff800038031350) at ktrsyscall+0x2c7 ktrwrite sys/kern/kern_ktrace.c:-1 [inline] ktrsyscall(ffff80003802bcb0,53,28,ffff800038031350) at ktrsyscall+0x2c7 sys/kern/kern_ktrace.c:183 syscall(ffff800038031350) at syscall+0x304 mi_syscall sys/sys/syscall_mi.h:154 [inline] syscall(ffff800038031350) at syscall+0x304 sys/arch/amd64/amd64/trap.c:746 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x75ac4767add0, count: -15 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x75ac4767afa0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x75ac4767afa0, count: -1