kernel: page fault trap, code=0 Stopped at witness_checkorder+0xb5: movl 0x20(%r14),%r15d TID PID UID PRFLAGS PFLAGS CPU COMMAND 51609 34387 0 0 0x1 1 sshd witness_checkorder(28,9,0) at witness_checkorder+0xb5 sys/kern/subr_witness.c:779 mtx_enter(18) at mtx_enter+0x95 sys/kern/kern_lock.c:406 clockintr_unbind(ffff8000015bbe30,1) at clockintr_unbind+0x56 sys/kern/kern_clockintr.c:375 dt_ioctl_record_stop(ffff80000161a000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:589 dtclose(11e5f,1,2000,ffff80003abfe558) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,1,2000,ffff80003abfe558) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80003abf19f0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8061d53db0,1,fffffd80097fd340,ffff80003abfe558) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c94c678,ffff80003abfe558) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c94c678,ffff80003abfe558) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c94c678,ffff80003abfe558) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806c94c678,ffff80003abfe558) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003abfe558) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003abfe558,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003abfe558,ffff80003abf1d60,ffff80003abf1cb0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003abf1d60) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003abf1d60) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 end trace frame: 0xffff80003abf1de0, count: 0 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: uvm_fault(0xfffffd806c7f5020, 0x48, 0, 1) -> e ddb{0}> trace witness_checkorder(28,9,0) at witness_checkorder+0xb5 sys/kern/subr_witness.c:779 mtx_enter(18) at mtx_enter+0x95 sys/kern/kern_lock.c:406 clockintr_unbind(ffff8000015bbe30,1) at clockintr_unbind+0x56 sys/kern/kern_clockintr.c:375 dt_ioctl_record_stop(ffff80000161a000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:589 dtclose(11e5f,1,2000,ffff80003abfe558) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,1,2000,ffff80003abfe558) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80003abf19f0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8061d53db0,1,fffffd80097fd340,ffff80003abfe558) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c94c678,ffff80003abfe558) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c94c678,ffff80003abfe558) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c94c678,ffff80003abfe558) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806c94c678,ffff80003abfe558) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003abfe558) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003abfe558,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003abfe558,ffff80003abf1d60,ffff80003abf1cb0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003abf1d60) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003abf1d60) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7457c1639510, count: -15 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff80003abf1810 rbx 0 rdx 0 rcx 0xffff80003abfe558 rax 0xffffffff83834ffe cpu_info_full_primary+0x1ffe r8 0x90 r9 0 r10 0xb2b16207ae1bd69f r11 0x2cc6994cdf0f850b r12 0xfe r13 0x9 r14 0x28 r15 0 rip 0xffffffff81f42695 witness_checkorder+0xb5 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80003abf1770 ss 0x10 witness_checkorder+0xb5: movl 0x20(%r14),%r15d ddb{0}> show proc PROC (syz-executor) tid=367310 pid=92169 tcnt=0 stat=onproc flags process=1008 proc=2000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0xffff80003abfe558 scnt=-1 ecnt=1 forw=0xffffffffffffffff, list=0xffff80003abffcb0,0xffff80003abf8fc0 process=0xffff80003c44a1d8 user=0xffff80003abec000, vmspace=0xfffffd806c7f5020 estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 14506 258841 34387 0 3 0x82 sbwait sshd-session 4169 419940 0 0 3 0x14200 acct acct 30476 446512 16948 0 2 0xc80 syz-executor 30476 220075 16948 0 3 0x4000080 lockf syz-executor 30476 158142 16948 0 3 0x4000080 fsleep syz-executor 65523 503029 88788 0 3 0x80 nanoslp syz-executor 65523 352181 88788 0 2 0x4000080 syz-executor 65523 509776 88788 0 3 0x4000080 fsleep syz-executor 8821 425091 0 0 3 0x14280 nfsidl nfsio 20451 344300 0 0 3 0x14280 nfsidl nfsio 39200 263411 0 0 3 0x14280 nfsidl nfsio 65604 84847 0 0 3 0x14280 nfsidl nfsio 37611 304608 92251 0 3 0x82 piperd syz-executor 86474 384207 92251 0 3 0x82 piperd syz-executor 73048 75128 92251 0 3 0x82 nanoslp syz-executor 16948 64709 92251 0 3 0x82 nanoslp syz-executor 88788 309210 92251 0 3 0x82 nanoslp syz-executor 48316 394960 92251 0 3 0x82 piperd syz-executor 19639 42238 92251 0 3 0x82 piperd syz-executor 92251 371550 13056 0 3 0x82 wait syz-executor 13056 126909 73422 0 3 0x10008a sigsusp ksh 73422 60526 39527 0 3 0x98 kqread sshd-session 39527 180299 34387 0 3 0x92 kqread sshd-session 34209 492047 1 0 3 0x100083 ttyopn getty 34387 51609 1 0 7 0x1 sshd 76081 21014 85556 74 3 0x1100092 bpf pflogd 85556 451132 1 0 3 0x80 sbwait pflogd 53030 270833 69235 73 3 0x1100090 kqread syslogd 69235 76131 1 0 3 0x100082 sbwait syslogd 92968 381109 1 0 3 0x100080 kqread resolvd 58711 74117 9615 77 3 0x100092 kqread dhcpleased 77888 4260 9615 77 3 0x100092 kqread dhcpleased 9615 84140 1 0 3 0x80 kqread dhcpleased 82722 503544 0 0 3 0x14200 bored smr 97796 379126 0 0 3 0x14200 pgzero zerothread 53107 381989 0 0 3 0x14200 aiodoned aiodoned 79481 209426 0 0 3 0x14200 syncer update 18307 324513 0 0 3 0x14200 cleaner cleaner 64658 32544 0 0 2 0x14200 reaper 70790 20996 0 0 3 0x14200 pgdaemon pagedaemon 67766 367457 0 0 3 0x14200 bored viomb 55350 430184 0 0 3 0x40014200 acpi0 acpi0 61832 107026 0 0 3 0x40014200 idle1 507 131070 0 0 3 0x14200 bored softnet1 78466 37911 0 0 3 0x14200 bored softnet0 15267 127626 0 0 3 0x14200 bored systqmp 73613 69819 0 0 3 0x14200 bored systq 80132 140974 0 0 3 0x14200 tmoslp softclockmp 51620 195226 0 0 3 0x40014200 tmoslp softclock 71888 39242 0 0 3 0x40014200 idle0 1 357882 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{0}> show all locks CPU 1: exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff839f60c0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487 #2 uvm_pmr_freepages+0x1a8 sys/uvm/uvm_pmemrange.c:-1 #3 uvm_anfree+0xe9 sys/uvm/uvm_anon.c:112 #4 amap_wipeout+0x246 sys/uvm/uvm_amap.c:-1 #5 uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353 #6 sys_munmap+0x329 sys/uvm/uvm_mmap.c:544 #7 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #7 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #8 Xsyscall+0x128 Process 34387 (sshd) thread 0xffff80002a263a00 (51609) kernel: protection fault trap, code=0 Faulted in DDB; continuing... ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11074 12130K 12318K 166960K 13110 0 pcb 17 14K 15K 166960K 262 0 rtable 217 9K 10K 166960K 881 0 pf 35 17K 19K 166960K 149 0 ifaddr 41 7K 8K 166960K 151 0 ifgroup 53 2K 2K 166960K 209 0 sysctl 4 1K 9K 166960K 13 0 counters 70 37K 38K 166960K 284 0 ioctlops 0 0K 4K 166960K 1666 0 iov 0 0K 16K 166960K 116 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1331 84K 85K 166960K 2191 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 2K 6K 166960K 17 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 36 0 dirhash 12 2K 2K 166960K 36 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 13 45K 240K 166960K 1218 0 sigio 0 0K 0K 166960K 19 0 proc 72 115K 164K 166960K 1004 0 subproc 72 4K 4K 166960K 198 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 118 0 in_multi 88 6K 7K 166960K 304 0 ether_multi 1 0K 0K 166960K 12 0 mrt 2 0K 0K 166960K 14 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 103 466K 466K 166960K 103 0 exec 0 0K 1K 166960K 735 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 228 172K 174K 166960K 12327 0 UVM aobj 23 14K 14K 166960K 26 0 pinsyscall 40 80K 108K 166960K 2738 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 87 0 NDP 14 0K 2K 166960K 107 0 temp 80 8688K 8756K 166960K 63287 0 kqueue 13 20K 32K 166960K 208 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> 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 120 117 0 114 1 0 1 1 0 8 0 rtentry 176 291 0 201 6 0 6 6 0 8 0 unpcb 144 662 0 639 6 5 1 4 0 8 0 syncache 336 11 0 11 5 4 1 1 0 8 1 tcpqe 32 5 0 5 2 2 0 1 0 8 0 tcpcb 736 426 0 413 15 8 7 7 0 8 5 arp 136 47 0 33 1 0 1 1 0 8 0 inpcb 328 1264 0 1248 15 8 7 9 0 8 5 nd6 152 69 0 46 2 0 2 2 0 8 0 pkpcb 40 6 0 6 6 5 1 1 0 8 1 kcovpl 48 22 0 14 1 0 1 1 0 8 0 ppxss 1192 82 0 81 3 2 1 1 0 8 0 pppxif 1504 6 0 6 2 1 1 1 0 8 1 pffrag 232 9 0 4 1 0 1 1 0 482 0 pffrnode 88 7 0 2 1 0 1 1 0 8 0 pffrent 40 17 0 12 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 pfrule 1360 1 0 1 1 1 0 1 0 8 0 rttmr 136 3 0 3 3 2 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 1223 0 830 32 4 28 29 0 8 3 art_table 40 1225 0 830 5 0 5 5 0 8 0 art_node 32 290 0 210 1 0 1 1 0 8 0 sysvmsgpl 40 9 0 6 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 29 0 19 1 0 1 1 0 8 0 shmpl 112 16 0 2 1 0 1 1 0 8 0 dirhash 1024 33 0 16 3 0 3 3 0 8 0 dino2pl 256 3429 0 1895 97 0 97 97 0 8 0 ffsino 296 3429 0 1895 119 0 119 119 0 8 0 nchpl 144 4867 0 4285 64 37 27 64 0 8 3 rtmask 32 14 0 14 3 2 1 1 0 8 1 vnodes 216 3891 0 0 217 0 217 217 0 8 0 namei 1024 17359 0 17359 3 2 1 2 0 8 1 percpumem 16 157 0 107 1 0 1 1 0 8 0 vcpupl 3968 6 0 0 1 0 1 1 0 8 0 vmpool 848 7 0 1 1 0 1 1 0 8 0 kstatmem 264 124 0 98 4 1 3 3 0 8 1 scsiplug 72 3 0 3 2 2 0 1 0 8 0 scxspl 216 33107 0 33107 13 12 1 8 1 8 1 plimitpl 152 237 0 220 1 0 1 1 0 8 0 sigapl 424 1519 0 1470 9 2 7 8 0 8 0 knotepl 120 773 0 0 23 0 23 23 0 8 0 kqueuepl 224 363 0 354 7 5 2 5 0 8 1 pipepl 344 290 0 263 9 2 7 9 0 8 4 fdescpl 528 1479 0 1451 3 0 3 3 0 8 0 filepl 160 8728 0 8506 25 9 16 18 0 8 5 lockfpl 104 345 0 341 1 0 1 1 0 8 0 lockfspl 48 138 0 135 1 0 1 1 0 8 0 sessionpl 144 43 0 33 1 0 1 1 0 8 0 pgrppl 48 88 0 70 1 0 1 1 0 8 0 ucredpl 104 1220 0 1207 1 0 1 1 0 8 0 zombiepl 144 1472 0 1470 1 0 1 1 0 8 0 processpl 1232 1519 0 1470 7 1 6 6 0 8 0 procpl 664 3093 0 3038 8 1 7 8 0 8 0 sosppl 176 12 0 12 3 2 1 1 0 8 1 sockpl 752 2073 0 2031 23 11 12 14 0 8 7 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 127 0 0 16 0 16 16 0 8 0 mcl2k 2048 27 0 0 4 0 4 4 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 1839 0 0 113 0 113 113 0 8 0 bufpl 280 13526 0 7390 439 0 439 439 0 8 0 anonpl 32 10047 0 0 83 1 82 82 0 246 0 amapchunkpl 152 40163 0 39765 38 13 25 30 0 158 4 amappl16 200 5281 0 5255 34 27 7 23 0 8 1 amappl15 192 4 0 4 1 1 0 1 0 8 0 amappl14 184 5 0 5 1 1 0 1 0 8 0 amappl13 176 597 0 596 1 0 1 1 0 8 0 amappl12 168 1951 0 1911 3 0 3 3 0 8 0 amappl11 160 6 0 6 1 1 0 1 0 8 0 amappl10 152 65 0 51 1 0 1 1 0 8 0 amappl9 144 247 0 247 1 1 0 1 0 8 0 amappl8 136 31 0 29 1 0 1 1 0 8 0 amappl7 128 198 0 196 1 0 1 1 0 8 0 amappl6 120 472 0 457 1 0 1 1 0 8 0 amappl5 112 88 0 76 1 0 1 1 0 8 0 amappl4 104 533 0 503 1 0 1 1 0 8 0 amappl3 96 7012 0 6937 4 1 3 3 0 8 0 amappl2 88 1589 0 1511 2 0 2 2 0 8 0 amappl1 80 16278 0 15660 16 1 15 15 0 8 0 amappl 88 11156 0 11014 5 0 5 5 0 92 0 uvmvnodes 80 131 0 0 3 0 3 3 0 8 0 dma65536 65536 1 0 1 1 0 1 1 0 8 1 dma4096 4096 2 0 2 2 2 0 1 0 8 0 dma2048 2048 2 0 2 2 2 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 25 0 3 1 0 1 1 0 8 0 uaddrrnd 24 1479 0 1451 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1479 0 1451 1 0 1 1 0 8 0 vmmpekpl 168 13962 0 13916 3 0 3 3 0 8 0 vmmpepl 168 103403 0 101606 107 18 89 104 0 357 1 vmsppl 488 1478 0 1451 6 1 5 5 0 8 0 rwobjpl 80 30804 0 29707 31 3 28 31 0 8 0 pdppl 4096 2979 0 2910 130 51 79 87 0 8 10 pvpl 32 17940 0 0 145 0 145 145 0 265 0 pmappl 256 1485 0 1452 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 434 0 75 11 0 11 11 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace witness_checkorder(28,9,0) at witness_checkorder+0xb5 sys/kern/subr_witness.c:779 mtx_enter(18) at mtx_enter+0x95 sys/kern/kern_lock.c:406 clockintr_unbind(ffff8000015bbe30,1) at clockintr_unbind+0x56 sys/kern/kern_clockintr.c:375 dt_ioctl_record_stop(ffff80000161a000) at dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:589 dtclose(11e5f,1,2000,ffff80003abfe558) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline] dtclose(11e5f,1,2000,ffff80003abfe558) at dtclose+0x109 sys/dev/dt/dt_dev.c:239 spec_close(ffff80003abf19f0) at spec_close+0x466 sys/kern/spec_vnops.c:-1 VOP_CLOSE(fffffd8061d53db0,1,fffffd80097fd340,ffff80003abfe558) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156 vn_closefile(fffffd806c94c678,ffff80003abfe558) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline] vn_closefile(fffffd806c94c678,ffff80003abfe558) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615 fdrop(fffffd806c94c678,ffff80003abfe558) at fdrop+0x121 sys/kern/kern_descrip.c:1280 closef(fffffd806c94c678,ffff80003abfe558) at closef+0x192 sys/kern/kern_descrip.c:1264 fdfree(ffff80003abfe558) at fdfree+0x116 sys/kern/kern_descrip.c:1195 exit1(ffff80003abfe558,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215 sys_exit(ffff80003abfe558,ffff80003abf1d60,ffff80003abf1cb0) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003abf1d60) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003abf1d60) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7457c1639510, count: -15 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299ddff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x3d sys/dev/kcov.c:159 ktrsysret(ffff80002a263a00,49,0,ffff80002a2c2bf0) at ktrsysret+0xde ktrwrite2 sys/kern/kern_ktrace.c:-1 [inline] ktrsysret(ffff80002a263a00,49,0,ffff80002a2c2bf0) at ktrsysret+0xde sys/kern/kern_ktrace.c:209 syscall(ffff80002a2c2ca0) at syscall+0xa50 mi_syscall_return sys/sys/syscall_mi.h:204 [inline] syscall(ffff80002a2c2ca0) at syscall+0xa50 sys/arch/amd64/amd64/trap.c:796 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x72148e8b6410, count: 8