uvm_fault(0xfffffd806c95b3e8, 0x0, 0, 1) -> e fatal page fault in supervisor mode trap type 6 code 0 rip ffffffff81994fa8 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80002a370330 gsbase 0xffff8000299ddff0 kgsbase 0x0 panic: trap type 6, code=0, pc=ffffffff81994fa8 Starting stack trace... panic(ffffffff833df6c5) at panic+0x1d0 sys/kern/subr_prf.c:229 kerntrap(ffff80002a370280) at kerntrap+0x30b alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b dt_ioctl_record_stop(ffff800001652000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:593 dtclose(21e5f,81,2000,ffff8000347d7cb0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(21e5f,81,2000,ffff8000347d7cb0) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80002a370430) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd805bbea3c0,81,fffffd80097fd3a8,ffff8000347d7cb0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd800c9d48e0,ffff8000347d7cb0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd800c9d48e0,ffff8000347d7cb0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd800c9d48e0,ffff8000347d7cb0) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd800c9d48e0,ffff8000347d7cb0) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff8000347d7cb0) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff8000347d7cb0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff8000347d7cb0,ffff80002a3707a0,ffff80002a3706f0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80002a3707a0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a3707a0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x79c9696fd760, count: 242 End of stack trace. WARNING: SPL NOT LOWERED ON SYSCALL 91 -902701144 EXIT 0 4 Stopped at savectx+0xae: movl $0,%gs:0x688 TID PID UID PRFLAGS PFLAGS CPU COMMAND 308825 91593 0 0 0 0 syz-executor *507172 49282 0 0x2 0 1 syz-executor savectx() at savectx+0xae end of kernel end trace frame: 0x7645ca31df90, 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(0xfffffd806c95b3e8, 0x0, 0, 1) -> e ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7645ca31df90, count: -1 ddb{1}> show registers rdi 0 rsi 0 rbp 0xffff80002a366430 rbx 0 rdx 0 rcx 0xffff8000ffff3a08 rax 0x3b r8 0xffff80002a366360 r9 0x1 r10 0x622e06e4d0444c3e r11 0x8dca52ee816be20c r12 0 r13 0 r14 0xffff8000ffff3a08 r15 0 rip 0xffffffff82f8e3ee savectx+0xae cs 0x8 rflags 0x46 rsp 0xffff80002a3663b0 ss 0x10 savectx+0xae: movl $0,%gs:0x688 ddb{1}> show proc PROC (syz-executor) tid=507172 pid=49282 tcnt=1 stat=onproc flags process=2 proc=0 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffffc7d0,0xffff8000ffff27f0 process=0xffff8000ffff6b58 user=0xffff80002a361000, vmspace=0xfffffd800b0635b8 estcpu=36, cpticks=200, pctcpu=0.39, user=4, sys=191, intr=5 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 74002 305535 49282 0 2 0 syz-executor 91593 308825 44897 0 7 0 syz-executor 91593 199066 44897 0 3 0x4000080 fsleep syz-executor 68217 309438 0 0 3 0x14200 acct acct 74723 277817 95530 0 2 0xc80 syz-executor 74723 53538 95530 0 3 0x4000080 fifow syz-executor 74723 193070 95530 0 3 0x4000080 fsleep syz-executor 95530 192262 46819 0 2 0xc82 syz-executor 54615 142814 46819 0 3 0x82 wait syz-executor 65925 491949 58014 0 4 0x82000 syz-executor 65925 166379 58014 0 4 0x4082000 syz-executor 65925 144023 58014 0 4 0x4082000 syz-executor 65925 378331 58014 0 3 0x4002000 suspend syz-executor 65925 292610 58014 0 4 0x4082000 syz-executor 26743 30897 46819 0 3 0x82 wait syz-executor 1022 416286 46819 0 2 0xc82 syz-executor *49282 507172 46819 0 7 0x2 syz-executor 58014 239904 46819 0 3 0x82 wait syz-executor 44897 367173 46819 0 2 0xc82 syz-executor 91371 152103 46819 0 3 0x82 wait syz-executor 46819 297719 22329 0 3 0x82 kqread syz-executor 22329 126486 32509 0 3 0x10008a sigsusp ksh 32509 117796 18028 0 3 0x98 kqread sshd-session 18028 133086 10203 0 3 0x92 kqread sshd-session 25978 201956 1 0 3 0x100083 ttyopn getty 10203 397675 1 0 3 0x88 kqread sshd 71181 424580 95535 74 3 0x1100092 bpf pflogd 95535 382237 1 0 3 0x80 sbwait pflogd 44785 114931 54616 73 3 0x1100090 kqread syslogd 54616 3480 1 0 3 0x100082 sbwait syslogd 51522 318955 1 0 3 0x100080 kqread resolvd 62893 483224 41043 77 3 0x100092 kqread dhcpleased 83624 464140 41043 77 3 0x100092 kqread dhcpleased 41043 160153 1 0 3 0x80 kqread dhcpleased 48437 522552 0 0 3 0x14200 bored smr 36986 408968 0 0 3 0x14200 pgzero zerothread 95003 294620 0 0 3 0x14200 aiodoned aiodoned 9555 280401 0 0 3 0x14200 syncer update 54074 471116 0 0 3 0x14200 cleaner cleaner 28303 240295 0 0 2 0x14200 reaper 8778 20542 0 0 3 0x14200 pgdaemon pagedaemon 38374 408078 0 0 3 0x14200 bored viomb 62669 143696 0 0 3 0x40014200 acpi0 acpi0 62409 464697 0 0 3 0x40014200 idle1 3998 46391 0 0 3 0x14200 bored softnet1 8618 215209 0 0 3 0x14200 netlock softnet0 93429 232939 0 0 2 0x40014200 systqmp 26883 466851 0 0 3 0x14200 bored systq 11206 228655 0 0 2 0x14200 softclockmp 91969 310349 0 0 2 0x40014200 softclock 43284 107564 0 0 3 0x40014200 idle0 1 491117 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 91593 (syz-executor) thread 0xffff8000347d4550 (308825) exclusive rwlock uobjlk r = 0 (0xfffffd806cd07c48) #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+0x1e5 sys/uvm/uvm_fault.c:649 #3 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #4 usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 #5 recall_trap+0x8 shared rwlock vmmaplk r = 0 (0xfffffd806c95baa0) #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:1880 #3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693 #4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627 #5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 #6 usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 #7 recall_trap+0x8 Process 28303 (reaper) thread 0xffff8000ffffd9f8 (240295) exclusive rwlock kmmaplk r = 0 (0xffffffff839377a8) #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 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5165 #3 uvm_unmap+0x7d sys/uvm/uvm_map.c:1792 #4 km_free+0x87 sys/uvm/uvm_km.c:714 #5 uvm_uarea_free+0x4f sys/uvm/uvm_glue.c:304 #6 reaper+0x1ca sys/kern/kern_exit.c:493 #7 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11099 12140K 12531K 166960K 14065 0 pcb 18 17K 18K 166960K 319 0 rtable 238 11K 11K 166960K 689 0 pf 40 18K 82K 166960K 264 0 ifaddr 41 7K 8K 166960K 138 0 ifgroup 62 2K 3K 166960K 231 0 sysctl 4 1K 9K 166960K 79 0 counters 72 37K 38K 166960K 326 0 ioctlops 0 0K 4K 166960K 1928 0 iov 0 0K 16K 166960K 76 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1397 88K 89K 166960K 2750 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 8 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 56 0 dirhash 12 2K 2K 166960K 39 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 18 65K 240K 166960K 1518 0 sigio 0 0K 0K 166960K 29 0 proc 72 115K 147K 166960K 779 0 subproc 72 4K 4K 166960K 108 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 157 0 in_multi 88 6K 7K 166960K 196 0 ether_multi 2 0K 0K 166960K 10 0 mrt 2 0K 0K 166960K 16 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 151 678K 678K 166960K 151 0 exec 0 0K 1K 166960K 723 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 2 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 265 168K 187K 166960K 15690 0 UVM aobj 36 14K 16K 166960K 41 0 pinsyscall 43 86K 108K 166960K 2803 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 2 0K 1K 166960K 113 0 NDP 15 0K 2K 166960K 100 0 temp 65 8684K 8755K 166960K 67585 0 kqueue 14 22K 32K 166960K 334 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 120 135 0 132 1 0 1 1 0 8 0 rtentry 176 185 0 89 6 0 6 6 0 8 0 unpcb 144 1381 0 1359 13 11 2 6 0 8 0 syncache 336 19 0 19 3 2 1 1 0 8 1 tcpqe 32 2 0 2 1 1 0 1 0 8 0 tcpcb 736 480 0 474 10 8 2 7 0 8 1 arp 136 29 0 12 1 0 1 1 0 8 0 ipq 40 1 0 1 1 0 1 1 0 8 1 ipqe 40 11 0 11 1 0 1 1 0 8 1 inpcb 328 1940 0 1928 29 22 7 12 0 8 5 nd6 152 42 0 18 2 1 1 2 0 8 0 pkpcb 40 13 0 13 3 3 0 1 0 8 0 kcovpl 48 12 0 4 1 0 1 1 0 8 0 ppxss 1192 110 0 110 2 1 1 1 0 8 1 pppxif 1504 8 0 8 3 2 1 1 0 8 1 pffrag 232 24 0 9 1 0 1 1 0 482 0 pffrnode 88 20 0 7 1 0 1 1 0 8 0 pffrent 40 41 0 25 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 pfrktable 1344 2 0 1 1 0 1 1 0 8 0 pfanchor 1288 2 0 2 1 1 0 1 0 8 0 pftag 88 3 0 0 1 0 1 1 0 8 0 pfstitem 24 1 0 0 1 0 1 1 0 8 0 pfstkey 128 1 0 0 1 0 1 1 0 8 0 pfstate 448 1 0 0 1 0 1 1 0 8 0 pfrule 1360 6 0 1 1 0 1 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 761 0 350 33 6 27 30 0 8 1 art_table 40 763 0 350 5 0 5 5 0 8 0 art_node 32 185 0 100 1 0 1 1 0 8 0 sysvmsgpl 40 13 0 10 2 1 1 1 0 8 0 semupl 112 2 0 2 2 2 0 1 0 8 0 semapl 112 51 0 41 1 0 1 1 0 8 0 shmpl 112 29 0 2 1 0 1 1 0 8 0 dirhash 1024 35 0 18 3 0 3 3 0 8 0 dino2pl 256 4371 0 2857 96 0 96 96 0 8 0 ffsino 296 4371 0 2857 118 0 118 118 0 8 0 nchpl 144 6430 0 4709 64 0 64 64 0 8 0 rtmask 32 10 0 10 3 3 0 1 0 8 0 vnodes 216 4047 0 0 225 0 225 225 0 8 0 namei 1024 23357 0 23356 4 3 1 2 0 8 0 percpumem 16 178 0 127 1 0 1 1 0 8 0 vcpupl 3968 6 0 0 1 0 1 1 0 8 0 vmpool 848 8 0 2 1 0 1 1 0 8 0 kstatmem 264 156 0 126 4 1 3 3 0 8 0 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 13 0 13 3 2 1 1 0 8 1 scxspl 216 46732 0 46732 11 10 1 8 1 8 1 plimitpl 152 356 0 338 1 0 1 1 0 8 0 sigapl 424 1823 0 1774 7 1 6 7 0 8 0 knotepl 120 620 0 0 19 0 19 19 0 8 0 kqueuepl 224 672 0 662 10 8 2 5 0 8 1 pipepl 344 384 0 357 12 9 3 9 0 8 0 fdescpl 528 1803 0 1771 3 0 3 3 0 8 0 filepl 160 13583 0 13345 36 20 16 21 0 8 5 lockfpl 104 670 0 667 2 1 1 2 0 8 0 lockfspl 48 207 0 204 1 0 1 1 0 8 0 sessionpl 144 40 0 31 1 0 1 1 0 8 0 pgrppl 48 62 0 45 1 0 1 1 0 8 0 ucredpl 104 2365 0 2352 1 0 1 1 0 8 0 zombiepl 144 1966 0 1962 2 1 1 1 0 8 0 processpl 1232 1823 0 1774 5 0 5 5 0 8 0 procpl 664 4239 0 4182 8 1 7 7 0 8 1 sosppl 176 12 0 12 4 3 1 1 0 8 1 sockpl 752 3496 0 3459 65 54 11 29 0 8 6 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 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 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 123 0 0 16 0 16 16 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 66 0 0 7 0 7 7 0 8 0 mtagpl 96 16 0 0 1 0 1 1 0 8 0 mbufpl 256 289 0 0 18 1 17 18 0 8 0 bufpl 280 19611 0 13475 439 0 439 439 0 8 0 anonpl 32 12141 0 0 99 1 98 98 0 246 0 amapchunkpl 152 53283 0 52726 54 26 28 38 0 158 4 amappl16 200 6939 0 6681 55 32 23 27 0 8 8 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 6 0 6 1 1 0 1 0 8 0 amappl13 176 473 0 472 1 0 1 1 0 8 0 amappl12 168 2224 0 2182 3 0 3 3 0 8 0 amappl11 160 3 0 3 1 1 0 1 0 8 0 amappl10 152 49 0 35 1 0 1 1 0 8 0 amappl9 144 287 0 287 1 1 0 1 0 8 0 amappl8 136 30 0 28 1 0 1 1 0 8 0 amappl7 128 93 0 91 1 0 1 1 0 8 0 amappl6 120 361 0 346 1 0 1 1 0 8 0 amappl5 112 124 0 113 1 0 1 1 0 8 0 amappl4 104 516 0 486 1 0 1 1 0 8 0 amappl3 96 9308 0 9206 4 1 3 3 0 8 0 amappl2 88 2011 0 1931 2 0 2 2 0 8 0 amappl1 80 19114 0 18523 16 2 14 15 0 8 0 amappl 88 14584 0 14401 5 0 5 5 0 92 0 uvmvnodes 80 153 0 0 4 0 4 4 0 8 0 dma65536 65536 1 0 1 1 1 0 1 0 8 0 dma16384 16384 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 0 1 1 0 8 1 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 7 0 7 2 2 0 1 0 8 0 dma128 128 256 0 256 4 4 0 1 0 8 0 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 40 0 5 1 0 1 1 0 8 0 uaddrrnd 24 1803 0 1771 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1803 0 1771 1 0 1 1 0 8 0 vmmpekpl 168 17324 0 17276 3 0 3 3 0 8 0 vmmpepl 168 126229 0 124005 123 15 108 111 0 357 6 vmsppl 488 1802 0 1771 6 1 5 5 0 8 0 rwobjpl 80 37233 0 35866 36 3 33 33 0 8 2 pdppl 4096 3630 0 3552 120 40 80 86 0 8 2 pvpl 32 20945 0 0 171 2 169 170 0 265 0 pmappl 256 1810 0 1773 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 327 0 65 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837dcff0) 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(ffffffff83934080) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83934080) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff83934080) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83934080) at __mp_lock+0x192 sys/kern/kern_lock.c:173 uvm_fault(fffffd806c95b9a0,273bd204000,0,1) at uvm_fault+0x1ea sys/uvm/uvm_fault.c:650 upageflttrap(ffff80003c424720,273bd204000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c424720) at usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7af041cc0210, count: 3 ddb{0}> trace x86_ipi_db(ffffffff837dcff0) 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(ffffffff83934080) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83934080) at __mp_lock+0x192 sys/kern/kern_lock.c:173 softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff83934080) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83934080) at __mp_lock+0x192 sys/kern/kern_lock.c:173 uvm_fault(fffffd806c95b9a0,273bd204000,0,1) at uvm_fault+0x1ea sys/uvm/uvm_fault.c:650 upageflttrap(ffff80003c424720,273bd204000) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192 usertrap(ffff80003c424720) at usertrap+0x42f sys/arch/amd64/amd64/trap.c:632 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7af041cc0210, count: -12 ddb{0}> machine ddbcpu 1 Stopped at savectx+0xae: movl $0,%gs:0x688 savectx() at savectx+0xae end of kernel end trace frame: 0x7645ca31df90, count: 14 ddb{1}> trace savectx() at savectx+0xae end of kernel end trace frame: 0x7645ca31df90, count: -1