uvm_fault(0xfffffd806bf10020, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff827cebe8 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80002a3dec30 gsbase 0xffff8000299edff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff827cebe8 Starting stack trace... panic(ffffffff833d061e) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80002a3deb80) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001483000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(11e5f,81,2000,ffff80003c431268) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003c431268) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80002a3ded30) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd806d5f5298,81,fffffd80097fb340,ffff80003c431268) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd8061e736a0,ffff80003c431268) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd8061e736a0,ffff80003c431268) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd8061e736a0,ffff80003c431268) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd8061e736a0,ffff80003c431268) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003c431268) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003c431268,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003c431268,ffff80002a3df0a0,ffff80002a3deff0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a3df0a0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a3df0a0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:765 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7202f9e84810, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 91 -1372652296 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 194313 82128 0 0 0 0 syz-executor *115611 93898 0 0x2 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x7450ae2efce0, 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(0xfffffd806bf10020, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7450ae2efce0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a31c5d0 rbx 0 rdx 0 rcx 0xffff8000ffff34d8 rax 0x3c r8 0xffff80002a31c500 r9 0x1 r10 0xe873418a45e0a840 r11 0xd97b06c486b5a872 r12 0 r13 0 r14 0xffff8000ffff34d8 r15 0 rip 0xffffffff812b33ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a31c550 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=115611 pid=93898 tcnt=1 stat=onproc flags process=2 proc=0 runpri=84, usrpri=84, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c44afd8,0xffff80003c4317a8 process=0xffff8000fffec4e8 user=0xffff80002a317000, vmspace=0xfffffd806bf109a8 estcpu=34, cpticks=59, pctcpu=0.21, user=0, sys=58, intr=1 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 82128 194313 16320 0 7 0 syz-executor 82128 462932 16320 0 3 0x4000000 biowait syz-executor 82128 31314 16320 0 3 0x4000080 fsleep syz-executor 16435 208939 84977 0 2 0 syz-executor 16435 344635 84977 0 2 0x4000000 syz-executor 51541 377191 90153 60929 2 0x10 syz-executor 51541 421011 90153 60929 3 0x4000090 fsleep syz-executor 51541 344883 90153 60929 3 0x4000090 fsleep syz-executor 82062 337432 93898 0 3 0x80 nanoslp syz-executor 82062 81127 93898 0 3 0x4000080 sbwait syz-executor 90194 139093 88645 0 3 0x80 nanoslp syz-executor 90194 23695 88645 0 3 0x4000080 ttyopn syz-executor 90194 305792 88645 0 3 0x4000080 fsleep syz-executor 90194 27455 88645 0 3 0x4000080 fsleep syz-executor 33978 176412 29349 0 2 0 syz-executor 33978 514068 29349 0 3 0x4000080 sbwait syz-executor 33978 289930 29349 0 3 0x4000080 fsleep syz-executor 33978 200889 29349 0 3 0x4000080 fsleep syz-executor 84977 273617 78846 0 3 0x82 nanoslp syz-executor 95283 346297 78846 0 3 0x2 biowait syz-executor 16320 495322 78846 0 3 0x82 nanoslp syz-executor 64838 172583 0 0 3 0x14280 nfsidl nfsio 47160 49234 0 0 3 0x14280 nfsidl nfsio 70199 125762 0 0 3 0x14280 nfsidl nfsio 81410 233473 0 0 3 0x14280 nfsidl nfsio 52757 147631 0 0 3 0x14280 nfsidl nfsio 50040 164924 0 0 3 0x14280 nfsidl nfsio 13126 462212 0 0 3 0x14280 nfsidl nfsio 43130 515468 0 0 3 0x14280 nfsidl nfsio 62397 82626 0 0 3 0x14280 nfsidl nfsio 45923 94128 0 0 3 0x14280 nfsidl nfsio 82732 190351 0 0 3 0x14280 nfsidl nfsio 16170 138026 0 0 3 0x14280 nfsidl nfsio 32121 499776 0 0 3 0x14280 nfsidl nfsio 98577 339206 0 0 3 0x14280 nfsidl nfsio 43272 221650 0 0 3 0x14280 nfsidl nfsio 63080 429810 0 0 3 0x14280 nfsidl nfsio 73052 216598 0 0 3 0x14280 nfsidl nfsio 86917 143244 0 0 3 0x14280 nfsidl nfsio *93898 115611 78846 0 7 0x2 syz-executor 88645 100373 78846 0 3 0x82 nanoslp syz-executor 29349 288633 78846 0 3 0x82 nanoslp syz-executor 90153 441046 78846 0 3 0x82 nanoslp syz-executor 64210 462249 78846 0 3 0x82 nanoslp syz-executor 34292 335552 80411 0 3 0x82 sbwait sshd-session 78846 47410 8086 0 2 0x2 syz-executor 8086 521780 284 0 3 0x10008a sigsusp ksh 284 46284 43199 0 3 0x98 kqread sshd-session 43199 518826 80411 0 3 0x92 kqread sshd-session 68200 409455 1 0 3 0x100083 ttyopn getty 80411 125161 1 0 3 0x88 kqread sshd 23158 81797 70340 74 3 0x1100092 bpf pflogd 70340 113375 1 0 3 0x80 sbwait pflogd 45328 81487 427 73 3 0x1100090 kqread syslogd 427 304932 1 0 3 0x100082 sbwait syslogd 30882 316577 1 0 3 0x100080 kqread resolvd 47759 399883 75459 77 3 0x100092 kqread dhcpleased 41532 149248 75459 77 3 0x100092 kqread dhcpleased 75459 9864 1 0 3 0x80 kqread dhcpleased 96366 467563 0 0 3 0x14200 bored smr 80440 449861 0 0 2 0x14200 zerothread 73573 32335 0 0 3 0x14200 aiodoned aiodoned 7912 409545 0 0 3 0x14200 syncer update 54172 108991 0 0 3 0x14200 cleaner cleaner 30750 400260 0 0 3 0x14200 reaper reaper 19837 218728 0 0 3 0x14200 pgdaemon pagedaemon 83459 72861 0 0 3 0x14200 bored viomb 53189 215849 0 0 3 0x40014200 acpi0 acpi0 99859 389571 0 0 3 0x40014200 idle1 22401 4414 0 0 3 0x14200 bored softnet1 68520 493399 0 0 3 0x14200 netlock softnet0 14596 196271 0 0 3 0x14200 smrbar systqmp 89737 195241 0 0 3 0x14200 bored systq 83762 461518 0 0 3 0x14200 tmoslp softclockmp 36888 319500 0 0 3 0x40014200 tmoslp softclock 65927 401973 0 0 3 0x40014200 idle0 1 325199 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 82128 (syz-executor) thread 0xffff80003c431a30 (462932) Process 95283 (syz-executor) thread 0xffff80003c44b7a0 (346297) Process 14596 (systqmp) thread 0xffff8000ffffe530 (196271) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10273 11165K 12077K 166960K 17150 0 pcb 20 17K 31K 166960K 1224 0 rtable 219 15K 16K 166960K 1410 0 pf 40 18K 67486K 166960K 465 0 ifaddr 39 8K 9K 166960K 314 0 ifgroup 64 2K 3K 166960K 577 0 sysctl 4 1K 9K 166960K 22 0 counters 72 37K 38K 166960K 600 0 ioctlops 0 0K 4K 166960K 2295 0 iov 0 0K 25K 166960K 312 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1488 94K 94K 166960K 5291 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 2K 9K 166960K 19 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 349 0 dirhash 12 2K 3K 166960K 78 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 17 61K 236K 166960K 4050 0 sigio 0 0K 0K 166960K 133 0 proc 72 115K 180K 166960K 1416 0 subproc 72 4K 4K 166960K 236 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 2 0K 0K 166960K 609 0 in_multi 61 4K 7K 166960K 459 0 ether_multi 2 0K 0K 166960K 63 0 mrt 1 0K 0K 166960K 39 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 265 1182K 1182K 166960K 265 0 exec 0 0K 1K 166960K 1201 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 7 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 264 153K 177K 166960K 37988 0 UVM aobj 117 27K 27K 166960K 131 0 pinsyscall 44 88K 104K 166960K 5691 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 315 0 NDP 18 0K 2K 166960K 233 0 temp 88 8664K 8920K 166960K 167026 0 kqueue 15 24K 33K 166960K 818 0 SYN cache 2 0K 16K 166960K 4 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 120 342 0 339 1 0 1 1 0 8 0 rtentry 176 434 0 364 6 1 5 6 0 8 0 unpcb 144 3542 0 3523 38 32 6 10 0 8 5 syncache 336 16 0 16 7 6 1 1 0 8 1 tcpqe 32 3 0 3 2 1 1 1 0 8 1 tcpcb 736 1151 0 1141 11 9 2 5 0 8 0 arp 136 75 0 59 1 0 1 1 0 8 0 inpcb 328 4737 0 4718 36 26 10 12 0 8 8 nd6 152 86 0 74 1 0 1 1 0 8 0 pkpcb 40 45 0 45 6 5 1 1 0 8 1 kcovpl 48 26 0 18 1 0 1 1 0 8 0 mppekey 1024 2 0 2 2 2 0 1 0 8 0 ppxss 1192 197 0 197 4 3 1 1 0 8 1 pppxif 1504 21 0 21 7 6 1 1 0 8 1 pfstscr 40 2 0 2 1 1 0 1 0 8 0 pffrag 232 35 0 19 1 0 1 1 0 482 0 pffrnode 88 33 0 18 1 0 1 1 0 8 0 pffrent 40 57 0 40 1 0 1 1 0 8 0 pfosfp 40 1431 0 1006 5 0 5 5 0 8 0 pfosfpen 112 1431 0 715 21 0 21 21 0 8 0 pfrktable 1344 2 0 2 2 2 0 1 0 8 0 pftag 88 3 0 0 1 0 1 1 0 8 0 pfstitem 24 58 0 49 1 0 1 1 0 8 0 pfstkey 128 62 0 53 2 0 2 2 0 8 0 pfstate 448 60 0 51 5 2 3 5 0 8 1 pfrule 1344 36 0 30 2 1 1 2 0 8 0 rttmr 136 2 0 2 1 1 0 1 0 8 0 art_heap8 4096 8 0 2 7 1 6 7 0 8 0 art_heap4 256 1741 0 1429 40 17 23 31 0 8 3 art_table 40 1749 0 1431 6 1 5 5 0 8 0 art_node 32 425 0 365 1 0 1 1 0 8 0 sysvmsgpl 40 12 0 7 1 0 1 1 0 8 0 semupl 112 6 0 6 5 5 0 1 0 8 0 semapl 112 342 0 332 1 0 1 1 0 8 0 shmpl 112 113 0 10 3 0 3 3 0 8 0 dirhash 1024 61 0 44 3 0 3 3 0 8 0 dino2pl 256 8862 0 7313 97 0 97 97 0 8 0 ffsino 296 8862 0 7313 120 0 120 120 0 8 0 nchpl 144 14127 0 12377 65 0 65 65 0 8 0 rtmask 32 47 0 47 4 3 1 1 0 8 1 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 50641 0 50639 5 4 1 3 0 8 0 percpumem 16 315 0 264 1 0 1 1 0 8 0 vcpupl 3968 12 0 1 2 0 2 2 0 8 0 vmpool 840 15 0 4 2 0 2 2 0 8 0 kstatmem 264 370 0 334 3 0 3 3 0 8 0 acpiwqpl 32 1 0 1 1 0 1 1 1 8 1 scsiplug 72 20 0 20 6 5 1 1 0 8 1 scxspl 216 88574 0 88572 20 17 3 8 1 8 2 plimitpl 152 923 0 905 1 0 1 1 0 8 0 sigapl 424 4378 0 4312 10 2 8 8 0 8 0 knotepl 120 624 0 0 18 0 18 18 0 8 0 kqueuepl 224 1899 0 1886 21 16 5 5 0 8 4 pipepl 344 822 0 792 9 6 3 9 0 8 0 fdescpl 528 4287 0 4255 3 0 3 3 0 8 0 filepl 160 30399 0 30161 49 31 18 21 0 8 4 lockfpl 104 1800 0 1797 3 2 1 2 0 8 0 lockfspl 48 787 0 784 1 0 1 1 0 8 0 sessionpl 144 50 0 40 1 0 1 1 0 8 0 pgrppl 48 124 0 106 1 0 1 1 0 8 0 ucredpl 104 4541 0 4526 1 0 1 1 0 8 0 zombiepl 144 5190 0 5189 1 0 1 1 0 8 0 processpl 1232 4378 0 4312 8 2 6 6 0 8 0 procpl 664 10953 0 10875 10 2 8 8 0 8 0 sosppl 176 36 0 36 7 6 1 1 0 8 1 sockpl 752 8843 0 8802 127 114 13 29 0 8 8 mcl64k 65536 20 0 0 3 0 3 3 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 132 0 0 17 0 17 17 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 100 0 0 7 0 7 7 0 8 0 mtagpl 96 6 0 0 1 0 1 1 0 8 0 mbufpl 256 1826 0 0 115 0 115 115 0 8 0 bufpl 280 34933 0 28796 439 0 439 439 0 8 0 anonpl 32 14208 0 0 115 0 115 115 0 246 0 amapchunkpl 152 139256 0 138633 71 37 34 38 0 158 5 amappl16 200 13069 0 13003 90 71 19 30 0 8 8 amappl15 192 9 0 9 1 1 0 1 0 8 0 amappl14 184 4 0 4 1 1 0 1 0 8 0 amappl13 176 656 0 655 1 0 1 1 0 8 0 amappl12 168 4799 0 4754 3 0 3 3 0 8 0 amappl11 160 6 0 5 1 0 1 1 0 8 0 amappl10 152 63 0 46 1 0 1 1 0 8 0 amappl9 144 255 0 254 2 1 1 1 0 8 0 amappl8 136 26 0 23 1 0 1 1 0 8 0 amappl7 128 162 0 160 1 0 1 1 0 8 0 amappl6 120 515 0 500 1 0 1 1 0 8 0 amappl5 112 96 0 84 1 0 1 1 0 8 0 amappl4 104 578 0 546 1 0 1 1 0 8 0 amappl3 96 23408 0 23310 4 1 3 3 0 8 0 amappl2 88 4433 0 4348 3 0 3 3 0 8 0 amappl1 80 28888 0 28213 18 2 16 16 0 8 0 amappl 88 36215 0 36034 5 0 5 5 0 92 0 uvmvnodes 80 224 0 0 5 0 5 5 0 8 0 dma65536 65536 2 0 2 2 2 0 1 0 8 0 dma32768 32768 1 0 1 1 1 0 1 0 8 0 dma16384 16384 1 0 1 1 1 0 1 0 8 0 dma8192 8192 1 0 1 1 1 0 1 0 8 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 dma512 512 1 0 1 1 1 0 1 0 8 0 dma256 256 7 0 7 2 2 0 1 0 8 0 dma128 128 259 0 259 5 5 0 1 0 8 0 dma64 64 12 0 12 5 5 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 72 130 0 14 3 0 3 3 0 8 0 uaddrrnd 24 4287 0 4255 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4287 0 4255 1 0 1 1 0 8 0 vmmpekpl 168 34088 0 34014 4 0 4 4 0 8 0 vmmpepl 168 273071 0 270960 146 33 113 119 0 357 6 vmsppl 488 4286 0 4255 6 1 5 5 0 8 0 rwobjpl 80 70021 0 68590 47 9 38 39 0 8 0 pdppl 4096 8612 0 8529 165 76 89 89 0 8 6 pvpl 32 24627 0 0 199 1 198 198 0 265 0 pmappl 256 4301 0 4259 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 500 0 127 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff83846ff0) 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(ffffffff83960c80) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83960c80) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(2) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsofttty() at Xsofttty+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff83960c80) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83960c80) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 intr_handler(ffff80002a41be50,ffff80000006b400) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7972ec611b00, count: 4 ddb{0}> trace x86_ipi_db(ffffffff83846ff0) 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(ffffffff83960c80) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83960c80) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(2) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsofttty() at Xsofttty+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff83960c80) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83960c80) at __mp_lock+0x1a3 sys/kern/kern_lock.c:173 intr_handler(ffff80002a41be50,ffff80000006b400) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f end of kernel end trace frame: 0x7972ec611b00, count: -11 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x7450ae2efce0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7450ae2efce0, count: -1