uvm_fault(0xfffffd800b027b70, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff831def38 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80002b44af60 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff831def38 Starting stack trace... panic(ffffffff833a4594) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80002b44aeb0) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff8000016b5000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586 dtclose(11e5f,81,2000,ffff800030fda2c0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff800030fda2c0) at dtclose+0x109 sys/dev/dt/dt_dev.c:232 spec_close(ffff80002b44b060) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8067694d88,81,fffffd80097fb6e8,ffff800030fda2c0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd805f6d7768,ffff800030fda2c0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805f6d7768,ffff800030fda2c0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd805f6d7768,ffff800030fda2c0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd805f6d7768,ffff800030fda2c0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff800030fda2c0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff800030fda2c0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff800030fda2c0,ffff80002b44b3d0,ffff80002b44b320) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002b44b3d0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002b44b3d0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x78fa95713d10, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 71 64 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND *170075 83472 0 0 0x4000000 1 syz-executor 9047 93876 0 0x2 0x1 0 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0xeb54db58c30, 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(0xfffffd800b027b70, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0xeb54db58c30, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a366cd0 rbx 0 rdx 0xffff80000147d740 rcx 0xffff800030fda7f0 rax 0x33 r8 0xffff80002a366c00 r9 0x1 r10 0xa4300cbfecfa7287 r11 0xbb94188f32b59109 r12 0 r13 0 r14 0xffff800030fda7f0 r15 0 rip 0xffffffff82ec33ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a366c50 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=170075 pid=83472 tcnt=4 stat=onproc flags process=0 proc=4000000 runpri=86, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800030fdb780,0xffff800030fda2d0 process=0xffff80002b427050 user=0xffff80002a361000, vmspace=0xfffffd800b027988 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 56743 156826 56478 0 3 0 kmmaplk syz-executor 46430 265912 1824 0 2 0 syz-executor 46430 318959 1824 0 3 0x4000000 kmmaplk syz-executor 94174 410029 78247 0 2 0 syz-executor 68595 136382 71359 0 2 0 syz-executor 68595 449186 71359 0 3 0x4000080 fsleep syz-executor 22406 352437 93876 0 2 0 syz-executor 22406 133925 93876 0 3 0x4000080 fsleep syz-executor 5173 359580 34856 0 2 0 syz-executor 5173 243298 34856 0 3 0x4000080 fsleep syz-executor 5173 247261 34856 0 2 0x4000000 syz-executor 83472 383218 50521 0 2 0 syz-executor *83472 170075 50521 0 7 0x4000000 syz-executor 83472 440629 50521 0 3 0x4000080 fsleep syz-executor 83472 80876 50521 0 3 0x4000080 fsleep syz-executor 93876 9047 82831 0 7 0x3 syz-executor 1824 398954 82831 0 3 0x82 nanoslp syz-executor 78247 467630 82831 0 2 0x3 syz-executor 20986 303830 82831 0 2 0x3 syz-executor 34856 410237 82831 0 2 0x3 syz-executor 50521 173486 82831 0 2 0x3 syz-executor 71359 355480 82831 0 2 0x3 syz-executor 78546 100888 47673 0 3 0x82 sbwait sshd-session 56478 295980 82831 0 3 0x82 nanoslp syz-executor 98387 196678 0 0 3 0x14200 bored sosplice 82831 320365 98999 0 3 0x82 kqread syz-executor 98999 485632 96005 0 3 0x10008a sigsusp ksh 96005 295390 46344 0 3 0x98 kqread sshd-session 46344 121445 47673 0 3 0x92 kqread sshd-session 75728 426492 1 0 3 0x100083 ttyin getty 47673 23835 1 0 3 0x88 kqread sshd 74578 317259 33528 74 3 0x1100092 bpf pflogd 33528 488792 1 0 3 0x80 sbwait pflogd 76567 349377 55193 73 3 0x1100090 kqread syslogd 55193 232163 1 0 3 0x100082 sbwait syslogd 46582 234073 1 0 3 0x100080 kqread resolvd 40321 100254 77005 77 3 0x100092 kqread dhcpleased 71784 225448 77005 77 3 0x100092 kqread dhcpleased 77005 477159 1 0 3 0x80 kqread dhcpleased 42746 220522 0 0 3 0x14200 bored smr 64404 391766 0 0 2 0x14200 zerothread 20801 19510 0 0 3 0x14200 aiodoned aiodoned 72635 500642 0 0 3 0x14200 syncer update 57548 206543 0 0 3 0x14200 cleaner cleaner 13086 66246 0 0 3 0x14200 reaper reaper 39532 32899 0 0 3 0x14200 pgdaemon pagedaemon 86867 476363 0 0 3 0x14200 bored viomb 68637 271829 0 0 3 0x40014200 acpi0 acpi0 36904 333950 0 0 3 0x40014200 idle1 13261 79365 0 0 3 0x14200 bored softnet1 57017 515298 0 0 3 0x14200 netlock softnet0 64306 456639 0 0 2 0x40014200 systqmp 26978 346132 0 0 3 0x14200 bored systq 62251 14658 0 0 3 0x14200 tmoslp softclockmp 70302 427949 0 0 3 0x40014200 tmoslp softclock 89391 333124 0 0 3 0x40014200 idle0 1 262464 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 22406 (syz-executor) thread 0xffff80002b450d30 (352437) exclusive rwlock vmmaplk r = 0 (0xfffffd806b9c6300) #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:1902 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:699 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:633 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x3c6 sys/arch/amd64/amd64/trap.c:605 #7 recall_trap+0x8 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10253 11231K 12853K 166960K 19700 0 pcb 17 18K 20K 166960K 823 0 rtable 261 16K 16K 166960K 1103 0 pf 38 18K 21K 166960K 402 0 ifaddr 43 9K 9K 166960K 304 0 ifgroup 60 2K 2K 166960K 533 0 sysctl 4 1K 9K 166960K 50 0 counters 70 37K 38K 166960K 564 0 ioctlops 0 0K 4K 166960K 2132 0 iov 0 0K 28K 166960K 332 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1537 97K 97K 166960K 5757 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 616K 624K 166960K 72 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 220 0 dirhash 12 2K 2K 166960K 117 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 4642 0 sigio 1 0K 0K 166960K 145 0 proc 72 115K 164K 166960K 1377 0 subproc 72 4K 4K 166960K 248 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 500 0 in_multi 81 6K 7K 166960K 450 0 ether_multi 1 0K 0K 166960K 30 0 mrt 1 0K 0K 166960K 24 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 235 1049K 1049K 166960K 235 0 exec 0 0K 1K 166960K 1325 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 75 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 265 180K 209K 166960K 41662 0 UVM aobj 154 6K 6K 166960K 161 0 pinsyscall 45 90K 104K 166960K 6186 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 201 0 NDP 13 0K 2K 166960K 226 0 temp 91 8656K 8912K 166960K 180218 0 kqueue 14 22K 35K 166960K 779 0 SYN cache 2 8K 16K 166960K 3 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 120 418 0 414 3 2 1 2 0 8 0 rtentry 176 383 0 292 5 0 5 5 0 8 0 unpcb 144 2725 0 2705 23 21 2 6 0 8 1 syncache 336 16 0 16 8 8 0 1 0 8 0 tcpqe 32 5 0 5 4 4 0 1 0 8 0 tcpcb 736 1804 0 1796 43 36 7 10 0 8 6 arp 136 43 0 26 1 0 1 1 0 8 0 ipq 40 2 0 2 1 0 1 1 0 8 1 ipqe 40 6 0 6 1 0 1 1 0 8 1 inpcb 328 5166 0 5151 64 56 8 13 0 8 5 nd6 152 72 0 57 1 0 1 1 0 8 0 pkpcb 40 26 0 26 7 6 1 1 0 8 1 kcovpl 48 27 0 19 1 0 1 1 0 8 0 mppekey 1024 2 0 2 2 2 0 1 0 8 0 ppxss 1192 185 0 184 2 1 1 1 0 8 0 pppxif 1504 29 0 29 5 5 0 1 0 8 0 pffrag 232 36 0 29 1 0 1 1 0 482 0 pffrnode 88 13 0 8 1 0 1 1 0 8 0 pffrent 40 80 0 73 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 24 203 0 135 1 0 1 1 0 8 0 pfstkey 128 203 0 136 3 0 3 3 0 8 0 pfstate 384 202 0 135 9 0 9 9 0 8 0 pfrule 1344 29 0 24 2 1 1 2 0 8 0 rttmr 136 6 0 6 5 5 0 1 0 8 0 art_heap8 4096 5 0 1 5 1 4 4 0 8 0 art_heap4 256 1727 0 1331 46 19 27 32 0 8 0 art_table 40 1732 0 1332 6 1 5 6 0 8 0 art_node 32 368 0 291 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 1 1 0 1 1 0 8 0 semupl 112 2 0 2 2 2 0 1 0 8 0 semapl 112 211 0 201 1 0 1 1 0 8 0 shmpl 112 158 0 7 5 0 5 5 0 8 0 dirhash 1024 89 0 72 3 0 3 3 0 8 0 dino2pl 256 9685 0 8130 98 0 98 98 0 8 0 ffsino 296 9685 0 8130 121 1 120 120 0 8 0 nchpl 144 15460 0 13729 65 0 65 65 0 8 0 rtmask 32 26 0 26 7 6 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 56505 0 56505 5 4 1 1 0 8 1 percpumem 16 297 0 247 1 0 1 1 0 8 0 kstatmem 264 342 0 314 8 5 3 3 0 8 1 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 41 0 41 7 6 1 1 0 8 1 scxspl 216 98619 0 98619 15 14 1 8 1 8 1 plimitpl 152 1041 0 1023 1 0 1 1 0 8 0 sigapl 424 4871 0 4821 10 3 7 9 0 8 0 knotepl 120 644 0 0 17 0 17 17 0 8 0 kqueuepl 224 1778 0 1768 21 16 5 5 0 8 4 pipepl 344 687 0 656 15 12 3 9 0 8 0 fdescpl 528 4816 0 4783 3 0 3 3 0 8 0 filepl 160 31996 0 31762 57 41 16 20 0 8 2 lockfpl 104 3550 0 3546 5 3 2 2 0 8 1 lockfspl 48 1443 0 1439 1 0 1 1 0 8 0 sessionpl 144 51 0 41 1 0 1 1 0 8 0 pgrppl 48 120 0 102 1 0 1 1 0 8 0 ucredpl 104 4845 0 4831 1 0 1 1 0 8 0 zombiepl 144 5717 0 5716 3 2 1 1 0 8 0 processpl 1232 4871 0 4821 7 1 6 6 0 8 0 procpl 664 11801 0 11743 8 0 8 8 0 8 0 sosppl 168 31 0 31 8 8 0 1 0 8 0 sockpl 752 8526 0 8487 106 94 12 27 0 8 6 mcl64k 65536 27 0 0 3 0 3 3 0 8 0 mcl16k 16384 14 0 0 2 0 2 2 0 8 0 mcl12k 12288 4 0 0 1 0 1 1 0 8 0 mcl9k 9216 6 0 0 1 0 1 1 0 8 0 mcl8k 8192 8 0 0 1 0 1 1 0 8 0 mcl4k 4096 126 0 0 16 0 16 16 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 48 0 0 6 0 6 6 0 8 0 mtagpl 96 6 0 0 1 0 1 1 0 8 0 mbufpl 256 630 0 0 35 0 35 35 0 8 0 bufpl 280 44220 0 38077 440 0 440 440 0 8 0 anonpl 32 14937 0 0 120 0 120 120 0 246 0 amapchunkpl 152 143453 0 142821 79 47 32 37 0 158 4 amappl16 200 13798 0 13723 131 114 17 30 0 8 8 amappl15 192 8 0 8 1 1 0 1 0 8 0 amappl14 184 176 0 163 1 0 1 1 0 8 0 amappl13 176 7 0 7 1 1 0 1 0 8 0 amappl12 168 5773 0 5740 3 1 2 2 0 8 0 amappl11 160 55 0 41 1 0 1 1 0 8 0 amappl10 152 4 0 4 1 1 0 1 0 8 0 amappl9 144 254 0 254 2 1 1 1 0 8 1 amappl8 136 26 0 23 1 0 1 1 0 8 0 amappl7 128 174 0 161 1 0 1 1 0 8 0 amappl6 120 376 0 371 1 0 1 1 0 8 0 amappl5 112 200 0 190 1 0 1 1 0 8 0 amappl4 104 358 0 337 1 0 1 1 0 8 0 amappl3 96 26115 0 26010 6 3 3 4 0 8 0 amappl2 88 5181 0 5090 3 0 3 3 0 8 0 amappl1 80 29592 0 28903 16 0 16 16 0 8 0 amappl 88 39898 0 39716 5 0 5 5 0 92 0 dma65536 65536 2 0 2 2 2 0 1 0 8 0 dma16384 16384 1 0 1 1 0 1 1 0 8 1 dma8192 8192 1 0 1 1 1 0 1 0 8 0 dma4096 4096 2 0 2 2 2 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 128 282 0 282 7 6 1 1 0 8 1 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 72 160 0 7 3 0 3 3 0 8 0 uaddrrnd 24 4816 0 4783 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4816 0 4783 1 0 1 1 0 8 0 vmmpekpl 168 35062 0 34998 4 0 4 4 0 8 0 vmmpepl 168 300541 0 298253 157 40 117 122 0 357 4 vmsppl 488 4815 0 4783 5 0 5 5 0 8 0 rwobjpl 80 79283 0 72098 162 7 155 157 0 8 0 pdppl 4096 9640 0 9566 134 60 74 84 0 8 0 pvpl 32 22578 0 0 182 1 181 181 0 265 0 pmappl 256 4815 0 4783 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 420 0 138 9 0 9 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837d7ff0) 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(ffffffff83988bd0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83988bd0) 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(ffffffff83988bd0) at __mp_lock+0x190 __mp_lock_spin sys/kern/kern_lock.c:135 [inline] __mp_lock(ffffffff83988bd0) at __mp_lock+0x190 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(ffffffff83988bd0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83988bd0) at __mp_lock+0x192 sys/kern/kern_lock.c:165 ktrsyscall(ffff8000fffee018,b,20,ffff80003c427350) at ktrsyscall+0x2c7 ktrwrite sys/kern/kern_ktrace.c:-1 [inline] ktrsyscall(ffff8000fffee018,b,20,ffff80003c427350) at ktrsyscall+0x2c7 sys/kern/kern_ktrace.c:183 syscall(ffff80003c427350) at syscall+0x304 mi_syscall sys/sys/syscall_mi.h:154 [inline] syscall(ffff80003c427350) at syscall+0x304 sys/arch/amd64/amd64/trap.c:748 end trace frame: 0xffff80003c4273d0, count: 0 ddb{0}> trace x86_ipi_db(ffffffff837d7ff0) 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(ffffffff83988bd0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83988bd0) 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(ffffffff83988bd0) at __mp_lock+0x190 __mp_lock_spin sys/kern/kern_lock.c:135 [inline] __mp_lock(ffffffff83988bd0) at __mp_lock+0x190 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(ffffffff83988bd0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83988bd0) at __mp_lock+0x192 sys/kern/kern_lock.c:165 ktrsyscall(ffff8000fffee018,b,20,ffff80003c427350) at ktrsyscall+0x2c7 ktrwrite sys/kern/kern_ktrace.c:-1 [inline] ktrsyscall(ffff8000fffee018,b,20,ffff80003c427350) at ktrsyscall+0x2c7 sys/kern/kern_ktrace.c:183 syscall(ffff80003c427350) at syscall+0x304 mi_syscall sys/sys/syscall_mi.h:154 [inline] syscall(ffff80003c427350) at syscall+0x304 sys/arch/amd64/amd64/trap.c:748 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x74bccccdbd10, 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: 0xeb54db58c30, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0xeb54db58c30, count: -1