uvm_fault(0xfffffd800b0631e8, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff81e9e078 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80003c4f0de0 gsbase 0xffff8000299ddff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff81e9e078 Starting stack trace... panic(ffffffff833dfd33) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80003c4f0d30) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001666000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(11e5f,81,2000,ffff80003a3f9a10) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,81,2000,ffff80003a3f9a10) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80003c4f0ee0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805d24c028,81,fffffd80097fd680,ffff80003a3f9a10) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd807566d358,ffff80003a3f9a10) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd807566d358,ffff80003a3f9a10) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd807566d358,ffff80003a3f9a10) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd807566d358,ffff80003a3f9a10) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003a3f9a10) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003a3f9a10,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003a3f9a10,ffff80003c4f1250,ffff80003c4f11a0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c4f1250) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c4f1250) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7ae5a253da00, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 91 1275919576 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND *292965 26361 0 0x2 0 1 syz-executor 281532 69448 0 0x14000 0x200 0 reaper savectx() at savectx+0xae end of kernel end trace frame: 0x7f5d4c0cfcc0, 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(0xfffffd800b0631e8, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7f5d4c0cfcc0, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a324270 rbx 0 rdx 0 rcx 0xffff80002a262a70 rax 0x3b r8 0xffff80002a3241a0 r9 0x1 r10 0xe99df451467bcef2 r11 0xb025471433255fce r12 0 r13 0 r14 0xffff80002a262a70 r15 0 rip 0xffffffff821203ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a3241f0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=292965 pid=26361 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=0xffff8000ffffcf98,0xffff80002a2627e8 process=0xffff8000ffff44d8 user=0xffff80002a31f000, vmspace=0xfffffd800b063d58 estcpu=36, cpticks=222, pctcpu=0.24, user=6, sys=189, intr=27 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 81562 146493 3081 0 2 0 syz-executor 94728 420789 81414 0 2 0 syz-executor 94728 504002 81414 0 2 0x4000000 syz-executor 61119 48267 21185 0 2 0 syz-executor 61119 273201 21185 0 3 0x4000080 bell syz-executor 61119 34470 21185 0 3 0x4000080 fsleep syz-executor 22813 76185 26361 0 2 0 syz-executor 22813 396933 26361 0 3 0x4000080 fsleep syz-executor 36034 165611 86281 0 2 0 syz-executor 36034 221153 86281 0 3 0x4000000 biowait syz-executor 36034 171721 86281 0 3 0x4000000 fltagain2 syz-executor 28098 234736 4700 0 2 0 syz-executor 28098 85596 4700 0 3 0x4000000 biowait syz-executor 28098 111541 4700 0 3 0x4000000 inode syz-executor 28098 238150 4700 0 3 0x4000000 inode syz-executor 28098 110032 4700 0 3 0x4000000 inode syz-executor 7473 179954 81635 0 2 0 syz-executor 7473 139039 81635 0 3 0x4000080 fsleep syz-executor 27498 272644 0 0 3 0x14200 acct acct 86281 70786 73483 0 3 0x82 nanoslp syz-executor 22088 340944 1 0 3 0x100083 ttyopn getty 81635 177546 73483 0 2 0x2 syz-executor 4700 235940 73483 0 3 0x82 nanoslp syz-executor 81414 204526 73483 0 3 0x82 nanoslp syz-executor 80821 417156 0 0 3 0x14280 nfsidl nfsio 46671 473902 0 0 3 0x14280 nfsidl nfsio 94152 520148 0 0 3 0x14280 nfsidl nfsio 85233 246629 0 0 3 0x14280 nfsidl nfsio 53048 336035 0 0 3 0x14280 nfsidl nfsio 81944 421495 0 0 3 0x14280 nfsidl nfsio 28632 236844 0 0 3 0x14280 nfsidl nfsio 98798 291205 0 0 3 0x14280 nfsidl nfsio 2926 148291 0 0 3 0x14280 nfsidl nfsio 43753 385810 0 0 3 0x14280 nfsidl nfsio 60305 266332 0 0 3 0x14280 nfsidl nfsio 88391 92723 0 0 3 0x14280 nfsidl nfsio 82101 147711 0 0 3 0x14280 nfsidl nfsio 16083 15646 0 0 3 0x14280 nfsidl nfsio 80264 234333 0 0 3 0x14280 nfsidl nfsio 4839 222643 0 0 3 0x14280 nfsidl nfsio 14282 65687 0 0 3 0x14280 nfsidl nfsio 14527 29815 0 0 3 0x14280 nfsidl nfsio 33973 465055 0 0 3 0x14280 nfsidl nfsio 2143 215838 0 0 3 0x14280 nfsidl nfsio 39540 36637 73483 0 3 0x82 nanoslp syz-executor 3081 361682 73483 0 2 0x2 syz-executor *26361 292965 73483 0 7 0x2 syz-executor 21185 266148 73483 0 3 0x82 nanoslp syz-executor 73483 505076 98699 0 3 0x82 kqread syz-executor 98699 21164 66096 0 3 0x10008a sigsusp ksh 66096 131150 66990 0 3 0x98 kqread sshd-session 66990 248900 10047 0 3 0x92 kqread sshd-session 10047 118743 1 0 3 0x88 kqread sshd 17889 351801 98664 74 3 0x1100092 bpf pflogd 98664 278146 1 0 3 0x80 sbwait pflogd 67889 324914 56167 73 3 0x1100090 kqread syslogd 56167 131839 1 0 3 0x100082 sbwait syslogd 53214 407624 1 0 3 0x100080 kqread resolvd 75264 30411 91819 77 3 0x100092 kqread dhcpleased 18837 500127 91819 77 3 0x100092 kqread dhcpleased 91819 51382 1 0 3 0x80 kqread dhcpleased 8654 386554 0 0 3 0x14200 bored smr 92915 276281 0 0 3 0x14200 pgzero zerothread 23410 269465 0 0 3 0x14200 aiodoned aiodoned 41674 313877 0 0 3 0x14200 syncer update 31286 94521 0 0 3 0x14200 cleaner cleaner 69448 281532 0 0 7 0x14200 reaper 33792 387808 0 0 3 0x14200 pgdaemon pagedaemon 3637 155583 0 0 3 0x14200 bored viomb 18446 5676 0 0 3 0x40014200 acpi0 acpi0 99896 457703 0 0 3 0x40014200 idle1 95320 282945 0 0 3 0x14200 bored softnet1 48341 51309 0 0 3 0x14200 netlock softnet0 82399 206566 0 0 2 0x40014200 systqmp 7853 32779 0 0 3 0x14200 bored systq 8858 474248 0 0 3 0x14200 tmoslp softclockmp 28359 320960 0 0 3 0x40014200 tmoslp softclock 11714 53790 0 0 3 0x40014200 idle0 1 242427 0 0 3 0x80082 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 36034 (syz-executor) thread 0xffff80003c412558 (221153) Process 28098 (syz-executor) thread 0xffff80003c412d20 (85596) Process 28098 (syz-executor) thread 0xffff80003c4127f0 (111541) Process 69448 (reaper) thread 0xffff8000ffffdc90 (281532) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11116 12218K 13933K 166960K 15399 0 pcb 17 18K 20K 166960K 1386 0 rtable 202 14K 14K 166960K 1036 0 pf 32 17K 82K 166960K 483 0 ifaddr 30 6K 8K 166960K 307 0 ifgroup 48 2K 3K 166960K 625 0 sysctl 4 1K 9K 166960K 62 0 counters 68 36K 38K 166960K 664 0 ioctlops 0 0K 8K 166960K 2543 0 iov 0 0K 24K 166960K 349 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1510 95K 96K 166960K 4519 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 54 0 VM map 2 1K 1K 166960K 2 0 sem 15 0K 1K 166960K 321 0 dirhash 12 2K 2K 166960K 81 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 4582 0 sigio 1 0K 0K 166960K 118 0 proc 74 115K 147K 166960K 1131 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 1105 0 in_multi 49 3K 7K 166960K 351 0 ether_multi 1 0K 0K 166960K 72 0 mrt 1 0K 0K 166960K 59 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 241 1076K 1076K 166960K 241 0 exec 0 0K 1K 166960K 1184 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 162K 180K 166960K 43837 0 UVM aobj 73 25K 25K 166960K 114 0 pinsyscall 43 86K 102K 166960K 5770 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 1 0K 1K 166960K 535 0 NDP 11 0K 2K 166960K 232 0 temp 88 8684K 8812K 166960K 218779 0 kqueue 14 22K 32K 166960K 915 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 120 535 0 532 7 6 1 3 0 8 0 rtentry 176 280 0 214 6 2 4 6 0 8 0 unpcb 144 3894 0 3877 37 33 4 8 0 8 3 syncache 336 4 0 4 2 2 0 1 0 8 0 tcpqe 32 7 0 7 1 1 0 1 0 8 0 tcpcb 736 1851 0 1847 49 45 4 7 0 8 3 arp 136 40 0 26 1 0 1 1 0 8 0 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 3 0 3 1 1 0 1 0 8 0 inpcb 328 5970 0 5962 69 62 7 13 0 8 6 nd6 152 47 0 35 1 0 1 1 0 8 0 pkpcb 40 41 0 41 12 11 1 1 0 8 1 kcovpl 48 13 0 5 1 0 1 1 0 8 0 mppekey 1024 3 0 3 3 2 1 1 0 8 1 ppxss 1192 225 0 225 6 5 1 1 0 8 1 pppxif 1504 35 0 35 11 11 0 1 0 8 0 pffrag 232 103 0 92 1 0 1 1 0 482 0 pffrnode 88 69 0 58 1 0 1 1 0 8 0 pffrent 40 194 0 182 2 1 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 pfrktable 1344 4 0 4 2 2 0 1 0 8 0 pfrule 1360 2 0 2 2 2 0 1 0 8 0 rttmr 136 9 0 9 4 3 1 1 0 8 1 art_heap8 4096 5 0 0 5 0 5 5 0 8 0 art_heap4 256 1340 0 1087 36 18 18 31 0 8 2 art_table 40 1345 0 1087 5 0 5 5 0 8 0 art_node 32 277 0 221 1 0 1 1 0 8 0 sysvmsgpl 40 12 0 9 1 0 1 1 0 8 0 semupl 112 2 0 2 2 2 0 1 0 8 0 semapl 112 308 0 295 1 0 1 1 0 8 0 shmpl 112 64 0 4 2 0 2 2 0 8 0 dirhash 1024 63 0 46 3 0 3 3 0 8 0 dino2pl 256 10385 0 8862 96 0 96 96 0 8 0 ffsino 296 10385 0 8862 118 0 118 118 0 8 0 nchpl 144 16875 0 15155 64 0 64 64 0 8 0 rtmask 32 44 0 44 9 8 1 1 0 8 1 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 60197 0 60194 9 8 1 3 0 8 0 percpumem 16 347 0 298 1 0 1 1 0 8 0 vcpupl 3968 10 0 0 2 0 2 2 0 8 0 vmpool 848 45 0 35 2 0 2 2 0 8 0 kstatmem 264 408 0 382 6 3 3 3 0 8 1 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 25 0 25 12 11 1 1 0 8 1 scxspl 216 149916 0 149914 23 22 1 8 1 8 0 plimitpl 152 965 0 946 1 0 1 1 0 8 0 sigapl 424 4837 0 4768 9 1 8 8 0 8 0 knotepl 120 734 0 0 17 0 17 17 0 8 0 kqueuepl 224 1881 0 1871 24 21 3 5 0 8 1 pipepl 344 825 0 795 31 25 6 12 0 8 3 fdescpl 528 4788 0 4756 3 0 3 3 0 8 0 filepl 160 36094 0 35861 65 49 16 19 0 8 3 lockfpl 104 1808 0 1805 3 2 1 2 0 8 0 lockfspl 48 637 0 634 1 0 1 1 0 8 0 sessionpl 144 30 0 21 1 0 1 1 0 8 0 pgrppl 48 251 0 234 1 0 1 1 0 8 0 ucredpl 104 5887 0 5874 1 0 1 1 0 8 0 zombiepl 144 5742 0 5741 4 3 1 1 0 8 0 processpl 1232 4837 0 4768 6 0 6 6 0 8 0 procpl 664 12588 0 12508 8 0 8 8 0 8 0 sosppl 176 30 0 30 10 9 1 1 0 8 1 sockpl 752 10606 0 10578 128 117 11 23 0 8 7 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 144 0 0 17 0 17 17 0 8 0 mcl2k 2048 115 0 0 9 1 8 8 0 8 0 mtagpl 96 13 0 0 1 0 1 1 0 8 0 mbufpl 256 1212 0 0 75 0 75 75 0 8 0 bufpl 280 66117 0 59981 439 0 439 439 0 8 0 anonpl 32 18278 0 0 147 0 147 147 0 246 0 amapchunkpl 152 154592 0 153978 98 61 37 38 0 158 6 amappl16 200 20226 0 20002 129 112 17 35 0 8 4 amappl15 192 7 0 7 1 1 0 1 0 8 0 amappl14 184 8 0 7 2 1 1 1 0 8 0 amappl13 176 485 0 484 1 0 1 1 0 8 0 amappl12 168 5292 0 5249 3 0 3 3 0 8 0 amappl11 160 6 0 6 3 3 0 1 0 8 0 amappl10 152 49 0 35 1 0 1 1 0 8 0 amappl9 144 265 0 265 2 2 0 1 0 8 0 amappl8 136 33 0 30 1 0 1 1 0 8 0 amappl7 128 102 0 99 1 0 1 1 0 8 0 amappl6 120 336 0 322 1 0 1 1 0 8 0 amappl5 112 116 0 105 1 0 1 1 0 8 0 amappl4 104 584 0 552 1 0 1 1 0 8 0 amappl3 96 27091 0 26994 4 1 3 3 0 8 0 amappl2 88 4902 0 4823 2 0 2 2 0 8 0 amappl1 80 27283 0 26694 15 1 14 14 0 8 0 amappl 88 42290 0 42106 5 0 5 5 0 92 0 uvmvnodes 80 232 0 0 5 0 5 5 0 8 0 dma65536 65536 1 0 1 1 0 1 1 0 8 1 dma32768 32768 2 0 2 2 2 0 1 0 8 0 dma16384 16384 65 0 65 1 1 0 1 0 8 0 dma8192 8192 1 0 1 1 1 0 1 0 8 0 dma4096 4096 2 0 2 2 2 0 1 0 8 0 dma2048 2048 66 0 66 2 1 1 1 0 8 1 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 128 263 0 263 8 7 1 1 0 8 1 dma64 64 8 0 8 3 3 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 113 0 41 2 0 2 2 0 8 0 uaddrrnd 24 4788 0 4756 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4788 0 4756 1 0 1 1 0 8 0 vmmpekpl 168 39474 0 39416 3 0 3 3 0 8 0 vmmpepl 168 304584 0 302396 169 64 105 116 0 357 5 vmsppl 488 4787 0 4756 8 3 5 5 0 8 0 rwobjpl 80 79562 0 78115 42 5 37 38 0 8 0 pdppl 4096 9673 0 9592 147 66 81 83 0 8 0 pvpl 32 25336 0 0 204 0 204 204 0 265 0 pmappl 256 4832 0 4791 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 472 0 154 10 0 10 10 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff838a2ff0) 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(ffffffff839cefc0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839cefc0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80002a2342f0,ffff800000079600) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff839cefc0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839cefc0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80002a234450,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x19 kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x19 sys/dev/kcov.c:153 reaper(ffff8000ffffdc90) at reaper+0x15b sys/kern/kern_exit.c:477 end trace frame: 0x0, count: 4 ddb{0}> trace x86_ipi_db(ffffffff838a2ff0) 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(ffffffff839cefc0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839cefc0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80002a2342f0,ffff800000079600) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge16_untramp() at Xintr_ioapic_edge16_untramp+0x18f __mp_lock(ffffffff839cefc0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff839cefc0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 intr_handler(ffff80002a234450,ffff8000002a3480) at intr_handler+0xe9 sys/arch/amd64/amd64/intr.c:560 Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x19 kd_curproc sys/dev/kcov.c:580 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x19 sys/dev/kcov.c:153 reaper(ffff8000ffffdc90) at reaper+0x15b sys/kern/kern_exit.c:477 end trace frame: 0x0, 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: 0x7f5d4c0cfcc0, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7f5d4c0cfcc0, count: -1