uvm_fault(0xfffffd806bf54020, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff8272c850 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80002a397ea0 gsbase 0xffff8000299ddff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff8272c850 Starting stack trace... panic(ffffffff8333dac5) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80002a397df0) at kerntrap+0x29b sys/arch/amd64/amd64/trap.c:327 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001478000) at dt_ioctl_record_stop+0xf0 sys/dev/dt/dt_dev.c:580 dtclose(21e5f,81,2000,ffff8000fffe7740) at dtclose+0x105 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,81,2000,ffff8000fffe7740) at dtclose+0x105 sys/dev/dt/dt_dev.c:232 spec_close(ffff80002a397fa0) at spec_close+0x45f sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806e15b048,81,fffffd80097fb750,ffff8000fffe7740) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156 vn_closefile(fffffd805e12dc00,ffff8000fffe7740) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd805e12dc00,ffff8000fffe7740) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd805e12dc00,ffff8000fffe7740) at fdrop+0x126 sys/kern/kern_descrip.c:1267 closef(fffffd805e12dc00,ffff8000fffe7740) at closef+0x192 sys/kern/kern_descrip.c:1251 fdfree(ffff8000fffe7740) at fdfree+0x116 sys/kern/kern_descrip.c:1182 exit1(ffff8000fffe7740,b,0,1) at exit1+0x59c sys/kern/kern_exit.c:215 sys_exit(ffff8000fffe7740,ffff80002a398310,ffff80002a398260) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a398310) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a398310) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7be535a62660, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 4 248 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND *425860 75507 0 0x2 0 1 syz-executor 141656 74103 0 0x2 0 0 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x7c4c02d97db0, 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(0xfffffd806bf54020, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7c4c02d97db0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a31caf0 rbx 0 rdx 0 rcx 0xffff80002a2922a8 rax 0x33 r8 0xffff80002a31ca20 r9 0x1 r10 0xeca423e708ba8ae0 r11 0xee8e8b0918207abd r12 0 r13 0 r14 0xffff80002a2922a8 r15 0 rip 0xffffffff81f723ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a31ca70 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=425860 pid=75507 tcnt=1 stat=onproc flags process=2 proc=0 runpri=50, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a292a58,0xffff80002a293c58 process=0xffff8000ffff4008 user=0xffff80002a317000, vmspace=0xfffffd800b026b40 estcpu=36, cpticks=3, pctcpu=0.23, user=1, sys=108, intr=3 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 26997 270199 36886 0 3 0x3000 suspend syz-executor 26997 249017 36886 0 3 0x4081000 smrbar syz-executor 7416 155552 96640 0 3 0x80 nanoslp syz-executor 7416 204275 96640 0 3 0x4000080 kqsel syz-executor 7416 150958 96640 0 3 0x4000080 fsleep syz-executor 7416 210047 96640 0 3 0x4000080 fsleep syz-executor 95548 147984 22914 0 3 0x80 nanoslp syz-executor 95548 359051 22914 0 3 0x4000080 lockf syz-executor 95548 462285 22914 0 3 0x4000080 lockf syz-executor 95548 60810 22914 0 3 0x4000080 fsleep syz-executor 56681 122791 772 0 3 0x80 nanoslp syz-executor 56681 321771 772 0 3 0x4000080 kqpoll syz-executor 24603 310605 87696 0 3 0x80 nanoslp syz-executor 24603 80463 87696 0 3 0x4000080 fsleep syz-executor 24603 322822 87696 0 3 0x4000080 fsleep syz-executor 24603 378287 87696 0 3 0x4000080 kqpoll syz-executor 22914 78344 74103 0 3 0x82 nanoslp syz-executor 29881 289858 74103 0 3 0x82 nanoslp syz-executor 72630 275949 0 0 3 0x14200 acct acct 96640 175041 74103 0 3 0x82 nanoslp syz-executor 87157 509225 74103 0 3 0x82 nanoslp syz-executor 36886 17847 74103 0 3 0x82 nanoslp syz-executor 51388 33688 0 0 3 0x14200 bored sosplice 87696 197827 74103 0 3 0x82 nanoslp syz-executor *75507 425860 74103 0 7 0x2 syz-executor 772 169904 74103 0 3 0x82 nanoslp syz-executor 74103 141656 87990 0 7 0x2 syz-executor 87990 368941 18669 0 3 0x10008a sigsusp ksh 18669 6670 15292 0 3 0x98 kqread sshd-session 15292 120625 5472 0 3 0x92 kqread sshd-session 81271 294914 1 0 3 0x100083 ttyopn getty 5472 233680 1 0 3 0x88 kqread sshd 35526 395035 45595 74 3 0x1100092 bpf pflogd 45595 266891 1 0 3 0x80 sbwait pflogd 47024 441079 23121 73 3 0x1100090 kqread syslogd 23121 199697 1 0 3 0x100082 sbwait syslogd 21333 22415 1 0 3 0x100080 kqread resolvd 64165 488974 58260 77 3 0x100092 kqread dhcpleased 26361 159998 58260 77 3 0x100092 kqread dhcpleased 58260 179614 1 0 3 0x80 kqread dhcpleased 79775 281811 0 0 3 0x14200 bored smr 52644 52975 0 0 3 0x14200 pgzero zerothread 81212 504945 0 0 3 0x14200 aiodoned aiodoned 45141 82968 0 0 3 0x14200 syncer update 70782 507547 0 0 3 0x14200 cleaner cleaner 38214 149190 0 0 3 0x14200 reaper reaper 12650 885 0 0 3 0x14200 pgdaemon pagedaemon 95568 71754 0 0 3 0x14200 bored viomb 83563 195592 0 0 3 0x40014200 acpi0 acpi0 95112 90307 0 0 3 0x40014200 idle1 19278 141165 0 0 3 0x14200 bored softnet3 28936 327304 0 0 3 0x14200 bored softnet2 96547 115570 0 0 3 0x14200 bored softnet1 52764 13235 0 0 3 0x14200 netlock softnet0 3755 470288 0 0 2 0x40014200 systqmp 65462 40043 0 0 3 0x14200 bored systq 54851 29539 0 0 3 0x14200 tmoslp softclockmp 39933 101068 0 0 3 0x40014200 tmoslp softclock 16699 23511 0 0 3 0x40014200 idle0 1 125423 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 26997 (syz-executor) thread 0xffff8000ffff22a0 (249017) exclusive rwlock clonelk r = 0 (0xffffffff83808038) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310 #2 if_clone_destroy+0x67 sys/net/if.c:-1 #3 ifioctl+0x5c5 sys/net/if.c:-1 #4 sys_ioctl+0x5c3 sys/kern/sys_generic.c:-1 #5 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 #6 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10212 11133K 11571K 166960K 15284 0 pcb 19 17K 21K 166960K 586 0 rtable 226 19K 19K 166960K 783 0 pf 32 17K 21K 166960K 207 0 ifaddr 38 7K 8K 166960K 148 0 ifgroup 51 2K 2K 166960K 255 0 sysctl 4 1K 9K 166960K 13 0 counters 66 36K 37K 166960K 288 0 ioctlops 0 0K 4K 166960K 1855 0 iov 0 0K 28K 166960K 150 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1419 89K 90K 166960K 3488 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 37 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 80 0 dirhash 15 2K 3K 166960K 90 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 102K 166960K 2427 0 sigio 1 0K 0K 166960K 60 0 proc 72 91K 128K 166960K 935 0 subproc 72 4K 4K 166960K 117 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 556 0 in_multi 78 5K 7K 166960K 215 0 ether_multi 1 0K 0K 166960K 10 0 mrt 2 0K 0K 166960K 13 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 1003 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 266 169K 191K 166960K 22606 0 UVM aobj 94 11K 11K 166960K 99 0 pinsyscall 42 84K 106K 166960K 3658 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 2 0K 0K 166960K 192 0 NDP 13 0K 2K 166960K 106 0 temp 80 8696K 8952K 166960K 136999 0 kqueue 13 20K 32K 166960K 408 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 120 197 0 194 2 1 1 2 0 8 0 rtentry 176 209 0 117 7 1 6 6 0 8 0 unpcb 144 2086 0 2067 19 13 6 9 0 8 4 syncache 336 10 0 10 3 3 0 1 0 8 0 tcpcb 736 613 0 578 10 6 4 4 0 8 0 arp 128 37 0 17 1 0 1 1 0 8 0 inpcb 328 2265 0 2222 30 26 4 12 0 8 0 nd6 144 44 0 21 1 0 1 1 0 8 0 pkpcb 40 16 0 16 3 2 1 1 0 8 1 kcovpl 48 13 0 5 1 0 1 1 0 8 0 ppxss 1192 85 0 85 3 2 1 1 0 8 1 pppxif 1504 11 0 11 3 2 1 1 0 8 1 pffrag 232 15 0 5 1 0 1 1 0 482 0 pffrnode 88 11 0 3 1 0 1 1 0 8 0 pffrent 40 19 0 8 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 3 0 0 1 0 1 1 0 8 0 pfstitem 24 105 0 41 1 0 1 1 0 8 0 pfstkey 128 105 0 41 3 0 3 3 0 8 0 pfstate 384 105 0 41 7 0 7 7 0 8 0 pfrule 1344 23 0 18 2 1 1 2 0 8 0 rttmr 136 3 0 3 2 2 0 1 0 8 0 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 806 0 439 33 9 24 31 0 8 1 art_table 32 809 0 439 4 0 4 4 0 8 0 art_node 16 202 0 125 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 4 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 74 0 64 1 0 1 1 0 8 0 shmpl 112 96 0 5 3 0 3 3 0 8 0 dirhash 1024 70 0 51 3 0 3 3 0 8 0 dino2pl 256 5826 0 4311 96 0 96 96 0 8 0 ffsino 288 5826 0 4311 109 0 109 109 0 8 0 nchpl 144 9223 0 8672 64 39 25 64 0 8 1 rtmask 32 14 0 14 5 4 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 31863 0 31863 5 4 1 2 0 8 1 percpumem 16 159 0 111 1 0 1 1 0 8 0 kstatmem 264 162 0 138 3 0 3 3 0 8 1 scsiplug 72 15 0 15 4 3 1 1 0 8 1 scxspl 216 45076 0 45076 19 16 3 8 1 8 3 plimitpl 152 294 0 277 1 0 1 1 0 8 0 sigapl 424 2738 0 2687 9 2 7 9 0 8 0 knotepl 120 614 0 0 17 0 17 17 0 8 0 kqueuepl 224 863 0 849 10 7 3 5 0 8 2 pipepl 336 291 0 263 3 0 3 3 0 8 0 fdescpl 520 2696 0 2665 3 0 3 3 0 8 0 filepl 160 17197 0 16905 44 29 15 25 0 8 2 lockfpl 104 837 0 831 1 0 1 1 0 8 0 lockfspl 48 360 0 357 1 0 1 1 0 8 0 sessionpl 144 33 0 24 1 0 1 1 0 8 0 pgrppl 48 84 0 67 1 0 1 1 0 8 0 ucredpl 104 2583 0 2570 1 0 1 1 0 8 0 zombiepl 144 2690 0 2687 2 1 1 1 0 8 0 processpl 1240 2738 0 2687 6 1 5 6 0 8 0 procpl 656 6463 0 6401 9 2 7 8 0 8 0 srpgc 96 15 0 15 3 2 1 1 0 8 1 sosppl 168 18 0 18 3 2 1 1 0 8 1 sockpl 728 4617 0 4552 72 61 11 35 0 8 5 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 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 129 0 0 16 0 16 16 0 8 0 mcl2k 2048 23 0 0 3 0 3 3 0 8 0 mtagpl 96 167 0 0 5 0 5 5 0 8 0 mbufpl 256 369 0 0 21 0 21 21 0 8 0 bufpl 280 15826 0 9684 440 0 440 440 0 8 0 anonpl 32 14837 0 0 120 0 120 120 0 246 0 amapchunkpl 152 79702 0 79063 65 33 32 46 0 158 6 amappl16 200 8045 0 7780 58 28 30 30 0 8 3 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 143 0 131 1 0 1 1 0 8 0 amappl13 176 12 0 12 3 3 0 1 0 8 0 amappl12 168 3424 0 3392 3 1 2 2 0 8 0 amappl11 160 54 0 40 1 0 1 1 0 8 0 amappl10 152 5 0 5 1 1 0 1 0 8 0 amappl9 144 258 0 258 2 2 0 1 0 8 0 amappl8 136 44 0 41 1 0 1 1 0 8 0 amappl7 128 156 0 144 1 0 1 1 0 8 0 amappl6 120 249 0 245 1 0 1 1 0 8 0 amappl5 112 153 0 142 1 0 1 1 0 8 0 amappl4 104 350 0 329 1 0 1 1 0 8 0 amappl3 96 16449 0 16325 4 0 4 4 0 8 0 amappl2 88 770 0 706 2 0 2 2 0 8 0 amappl1 80 19565 0 18963 17 2 15 15 0 8 0 amappl 88 21381 0 21189 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 9 0 9 4 4 0 1 0 8 0 dma128 128 257 0 257 4 3 1 1 0 8 1 dma64 64 8 0 8 3 3 0 1 0 8 0 dma32 32 8 0 8 2 2 0 1 0 8 0 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 98 0 5 2 0 2 2 0 8 0 uaddrrnd 24 2696 0 2665 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2696 0 2665 1 0 1 1 0 8 0 vmmpekpl 168 21802 0 21745 3 0 3 3 0 8 0 vmmpepl 168 174833 0 172547 123 9 114 118 0 357 2 vmsppl 480 2695 0 2665 6 1 5 5 0 8 0 rwobjpl 72 49513 0 42281 140 2 138 138 0 8 3 pdppl 4096 5399 0 5330 113 40 73 87 0 8 4 pvpl 32 24049 0 0 195 1 194 194 0 265 0 pmappl 256 2695 0 2665 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 430 0 67 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff838c7ff0) 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(ffffffff83a0bd38) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83a0bd38) at __mp_lock+0x192 sys/kern/kern_lock.c:165 intr_handler(ffff80002a2e3720,ffff800000069c00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff83a0bd38) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83a0bd38) at __mp_lock+0x192 sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x12a sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 spllower(0) at spllower+0xb8 sys/arch/amd64/amd64/intr.c:818 msleep_nsec(fffffd806f0c7460,fffffd806f0c7460,318,ffffffff83407857,3b9aca00) at msleep_nsec+0x316 sys/kern/kern_synch.c:225 kqueue_sleep(fffffd806f0c7460,ffff80002a2e3ef8) at kqueue_sleep+0x12b sys/kern/kern_event.c:1608 kqueue_scan(ffff80002a2e3cc0,8,ffff80002a2e3bc0,ffff80002a2e3ef8,ffff80002a292f78,ffff80002a2e3e6c) at kqueue_scan+0x21e sys/kern/kern_event.c:1663 end trace frame: 0xffff80002a2e3ed0, count: 0 ddb{0}> trace x86_ipi_db(ffffffff838c7ff0) 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(ffffffff83a0bd38) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83a0bd38) at __mp_lock+0x192 sys/kern/kern_lock.c:165 intr_handler(ffff80002a2e3720,ffff800000069c00) at intr_handler+0xe1 sys/arch/amd64/amd64/intr.c:559 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff83a0bd38) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline] __mp_lock(ffffffff83a0bd38) at __mp_lock+0x192 sys/kern/kern_lock.c:165 softintr_dispatch(0) at softintr_dispatch+0x12a sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847 Xsoftclock() at Xsoftclock+0x27 spllower(0) at spllower+0xb8 sys/arch/amd64/amd64/intr.c:818 msleep_nsec(fffffd806f0c7460,fffffd806f0c7460,318,ffffffff83407857,3b9aca00) at msleep_nsec+0x316 sys/kern/kern_synch.c:225 kqueue_sleep(fffffd806f0c7460,ffff80002a2e3ef8) at kqueue_sleep+0x12b sys/kern/kern_event.c:1608 kqueue_scan(ffff80002a2e3cc0,8,ffff80002a2e3bc0,ffff80002a2e3ef8,ffff80002a292f78,ffff80002a2e3e6c) at kqueue_scan+0x21e sys/kern/kern_event.c:1663 dopselect(ffff80002a292f78,35,766912187d60,0,0,ffff80002a2e3ef8,765db371393c8c3f,ffff80002a292f78) at dopselect+0x5eb sys/kern/sys_generic.c:691 sys_pselect(ffff80002a292f78,ffff80002a2e4040,ffff80002a2e3f90) at sys_pselect+0x263 sys/kern/sys_generic.c:589 syscall(ffff80002a2e4040) at syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2e4040) at syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x766912187d10, count: -18 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x7c4c02d97db0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7c4c02d97db0, count: -1