panic: pool_do_get: shmpl free list modified: page 0xfffffd8064308000; item addr 0xfffffd8064308230; offset 0x40=0x69bdb2e5 Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *403977 73807 32767 0x10 0x4000000 0K syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83441c23) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff83a10458,1,ffff80003c4033e8) at pool_do_get+0x5df pool_get(ffffffff83a10458,1) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff80003c41a2c0,ffff80003c403640,80,ffff80003c403590) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff80003c41a2c0,ffff80003c403640,ffff80003c403590) at sys_shmget+0x195 sys/kern/sysv_shm.c:482 syscall(ffff80003c403640) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c403640) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe802b97c8b0, count: 7 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: pool_do_get: shmpl free list modified: page 0xfffffd8064308000; item addr 0xfffffd8064308230; offset 0x40=0x69bdb2e5 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83441c23) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff83a10458,1,ffff80003c4033e8) at pool_do_get+0x5df pool_get(ffffffff83a10458,1) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff80003c41a2c0,ffff80003c403640,80,ffff80003c403590) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff80003c41a2c0,ffff80003c403640,ffff80003c403590) at sys_shmget+0x195 sys/kern/sysv_shm.c:482 syscall(ffff80003c403640) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c403640) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe802b97c8b0, count: -8 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c403210 rbx 0xffffffff8392de07 cpu_info_full_primary+0x2e07 rdx 0 rcx 0xffff80003c41a2c0 rax 0xffffffff8392cff0 cpu_info_full_primary+0x1ff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xf27fcd187bca9de r11 0xc733c91b54ad49f8 r12 0xffffffff8392dc08 cpu_info_full_primary+0x2c08 r13 0 r14 0 r15 0x1 rip 0xffffffff82fbc905 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c403200 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=403977 pid=73807 tcnt=3 stat=onproc flags process=10 proc=4000000 runpri=32, usrpri=86, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c41aa88,0xffff8000fffe6fc0 process=0xffff80003c3edd00 user=0xffff80003c3fe000, vmspace=0xfffffd80696b95e8 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 75438 359072 61901 32767 2 0x10 syz-executor 75438 399883 61901 32767 3 0x4000090 fsleep syz-executor 79688 341239 97163 32767 3 0x3010 suspend syz-executor 79688 295690 97163 32767 2 0x4081090 syz-executor 79688 50925 97163 32767 2 0x4081010 syz-executor 79688 253592 97163 32767 2 0x4081010 syz-executor 79688 381543 97163 32767 2 0x4081010 syz-executor 73807 6410 87342 32767 2 0x10 syz-executor 73807 31923 87342 32767 2 0x4000090 syz-executor *73807 403977 87342 32767 7 0x4000010 syz-executor 69995 86008 5431 32767 2 0x10 syz-executor 69995 506930 5431 32767 2 0x4000010 syz-executor 69995 299339 5431 32767 3 0x4000090 fsleep syz-executor 11632 190927 98615 32767 2 0x10 syz-executor 11632 205171 98615 32767 2 0x4000010 syz-executor 11632 324488 98615 32767 3 0x4000090 fsleep syz-executor 11632 332826 98615 32767 3 0x4000090 fsleep syz-executor 87342 4137 16044 32767 3 0x90 nanoslp syz-executor 64359 456798 17455 32767 3 0x90 nanoslp syz-executor 59069 11874 21762 32767 3 0x90 nanoslp syz-executor 98615 60005 17068 32767 3 0x90 nanoslp syz-executor 97163 466393 43117 32767 3 0x90 nanoslp syz-executor 61901 166846 7280 32767 3 0x90 nanoslp syz-executor 5431 89502 61309 32767 3 0x90 nanoslp syz-executor 34161 508787 37031 32767 3 0x90 nanoslp syz-executor 16044 339723 39024 0 3 0x82 wait syz-executor 21762 461099 39024 0 3 0x82 wait syz-executor 61309 128323 39024 0 3 0x82 wait syz-executor 43117 103185 39024 0 3 0x82 wait syz-executor 17068 29703 39024 0 3 0x82 wait syz-executor 37031 98278 39024 0 3 0x82 wait syz-executor 17455 491045 39024 0 3 0x82 wait syz-executor 7280 518935 39024 0 3 0x82 wait syz-executor 39024 208834 41360 0 3 0x82 kqread syz-executor 41360 123210 84243 0 3 0x10008a sigsusp ksh 84243 497596 82920 0 3 0x98 kqread sshd-session 82920 279654 52688 0 3 0x92 kqread sshd-session 86121 46565 1 0 3 0x100083 ttyin getty 52688 472912 1 0 3 0x88 kqread sshd 92267 52813 4488 73 3 0x1100090 kqread syslogd 4488 237694 1 0 3 0x100082 sbwait syslogd 44307 178366 1 0 3 0x100080 kqread resolvd 76696 311915 7821 77 3 0x100092 kqread dhcpleased 63473 503121 7821 77 3 0x100092 kqread dhcpleased 7821 150479 1 0 3 0x80 kqread dhcpleased 348 22403 0 0 3 0x14200 bored smr 5035 365957 0 0 3 0x14200 pgzero zerothread 60949 55688 0 0 3 0x14200 aiodoned aiodoned 6085 15899 0 0 3 0x14200 syncer update 35543 63296 0 0 3 0x14200 cleaner cleaner 38606 48599 0 0 3 0x14200 reaper reaper 43594 69652 0 0 3 0x14200 pgdaemon pagedaemon 6758 436329 0 0 3 0x14200 bored viomb 43278 266715 0 0 3 0x40014200 acpi0 acpi0 4448 464677 0 0 3 0x40014200 idle1 430 111304 0 0 3 0x14200 bored softnet1 31471 109839 0 0 3 0x14200 bored softnet0 79079 509176 0 0 3 0x14200 bored systqmp 62209 271387 0 0 3 0x14200 bored systq 86682 164618 0 0 3 0x14200 tmoslp softclockmp 82819 101118 0 0 3 0x40014200 tmoslp softclock 99944 315593 0 0 3 0x40014200 idle0 1 42199 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex shmpl r = 0 (0xffffffff83a10470) #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 pool_get+0x124 sys/kern/subr_pool.c:585 #3 shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 #4 sys_shmget+0x195 sys/kern/sysv_shm.c:482 #5 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #6 Xsyscall+0x128 CPU 1: exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806cb14710) #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 pmap_do_remove+0xa9 rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline] #2 pmap_do_remove+0xa9 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline] #2 pmap_do_remove+0xa9 sys/arch/amd64/amd64/pmap.c:1824 #3 uvm_unmap_kill_entry_withlock+0x269 sys/uvm/uvm_map.c:1869 #4 uvm_map_teardown+0x117 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:-1 [inline] #4 uvm_map_teardown+0x117 sys/uvm/uvm_map.c:2497 #5 exit1+0x6fc sys/kern/kern_exit.c:260 #6 sys_exit+0x1a sys/kern/kern_exit.c:-1 #7 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #7 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #8 Xsyscall+0x128 Process 73807 (syz-executor) thread 0xffff80003c41a2c0 (403977) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff83a0e3c0) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline] #1 syscall+0xaf4 sys/arch/amd64/amd64/trap.c:783 #2 Xsyscall+0x128 exclusive mutex shmpl r = 0 (0xffffffff83a10470) #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 pool_get+0x124 sys/kern/subr_pool.c:585 #3 shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 #4 sys_shmget+0x195 sys/kern/sysv_shm.c:482 #5 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 #6 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11061 12019K 12034K 166960K 12152 0 pcb 17 14K 16K 166960K 19 0 rtable 249 7K 7K 166960K 377 0 pf 31 16K 16K 166960K 31 0 ifaddr 42 7K 7K 166960K 44 0 ifgroup 50 2K 2K 166960K 50 0 sysctl 4 1K 9K 166960K 9 0 counters 70 37K 37K 166960K 70 0 ioctlops 0 0K 2K 166960K 35 0 iov 0 0K 12K 166960K 36 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1287 81K 81K 166960K 1512 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 10 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 25 0 dirhash 12 2K 2K 166960K 27 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 25 93K 125K 166960K 537 0 sigio 0 0K 0K 166960K 72 0 proc 61 115K 147K 166960K 559 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 1 0K 0K 166960K 203 0 in_multi 101 7K 7K 166960K 112 0 ether_multi 2 0K 0K 166960K 4 0 mrt 0 0K 0K 166960K 17 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 109 493K 493K 166960K 109 0 exec 0 0K 1K 166960K 471 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 255 174K 191K 166960K 6715 0 UVM aobj 18 2K 3K 166960K 20 0 pinsyscall 46 92K 114K 166960K 1658 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 3 0K 0K 166960K 39 0 NDP 11 0K 2K 166960K 27 0 temp 65 9081K 9145K 166960K 5735 0 kqueue 15 22K 30K 166960K 102 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 65 0 60 1 0 1 1 0 8 0 rtentry 176 119 0 3 6 0 6 6 0 8 0 unpcb 144 447 0 432 2 0 2 2 0 8 1 syncache 336 7 0 7 1 0 1 1 0 8 1 tcpqe 32 1 0 1 1 0 1 1 0 8 1 tcpcb 736 287 0 280 7 1 6 7 0 8 5 arp 136 19 0 0 1 0 1 1 0 8 0 ipq 40 2 0 1 1 0 1 1 0 8 0 ipqe 40 4 0 3 1 0 1 1 0 8 0 inpcb 328 724 0 709 13 3 10 13 0 8 8 ip6q 72 2 0 0 1 0 1 1 0 8 0 ip6af 40 2 0 0 1 0 1 1 0 8 0 nd6 152 31 0 2 2 0 2 2 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 485 0 2 31 0 31 31 0 8 0 art_table 40 486 0 2 5 0 5 5 0 8 0 art_node 32 119 0 13 1 0 1 1 0 8 0 sysvmsgpl 40 41 0 1 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 22 0 12 1 0 1 1 0 8 0 shmpl 112 17 0 2 1 0 1 1 0 8 0 pool(0xffffffff83a10458:shmpl): page inconsistency: page 0xfffffd8064308000; 19 on list, 15 missing, 35 items per page dirhash 1024 28 0 11 3 0 3 3 0 8 0 dino2pl 256 2271 0 803 93 0 93 93 0 8 0 ffsino 296 2271 0 803 114 0 114 114 0 8 0 nchpl 144 3049 0 1358 63 0 63 63 0 8 0 vnodes 216 2352 0 0 131 0 131 131 0 8 0 namei 1024 10338 0 10338 2 1 1 2 0 8 1 percpumem 16 50 0 0 1 0 1 1 0 8 0 kstatmem 264 24 0 0 2 0 2 2 0 8 0 scxspl 216 10198 0 10198 10 5 5 8 1 8 5 plimitpl 152 107 0 82 2 0 2 2 0 8 0 sigapl 424 838 0 784 7 0 7 7 0 8 0 knotepl 120 324 0 0 10 0 10 10 0 8 0 kqueuepl 224 147 0 137 2 0 2 2 0 8 1 pipepl 344 162 0 134 3 0 3 3 0 8 0 fdescpl 528 822 0 785 4 0 4 4 0 8 0 filepl 160 4794 0 4569 17 0 17 17 0 8 7 lockfpl 104 213 0 211 1 0 1 1 0 8 0 lockfspl 48 54 0 52 1 0 1 1 0 8 0 sessionpl 144 25 0 9 1 0 1 1 0 8 0 pgrppl 48 38 0 14 1 0 1 1 0 8 0 ucredpl 104 978 0 959 1 0 1 1 0 8 0 zombiepl 144 787 0 784 1 0 1 1 0 8 0 processpl 1232 838 0 784 5 0 5 5 0 8 0 procpl 664 1530 0 1464 7 0 7 7 0 8 1 sosppl 176 6 0 6 1 0 1 1 0 8 1 sockpl 752 1247 0 1212 17 5 12 17 0 8 7 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 115 0 0 15 0 15 15 0 8 0 mcl2k 2048 25 0 0 4 0 4 4 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 287 0 0 18 0 18 18 0 8 0 bufpl 280 3266 0 102 226 0 226 226 0 8 0 anonpl 32 11435 0 0 93 0 93 93 0 246 0 amapchunkpl 152 22424 0 21653 40 0 40 40 0 158 9 amappl16 200 3321 0 3068 29 15 14 26 0 8 0 amappl15 192 19 0 19 1 1 0 1 0 8 0 amappl14 184 424 0 423 1 0 1 1 0 8 0 amappl13 176 122 0 112 1 0 1 1 0 8 0 amappl12 168 1060 0 1023 2 0 2 2 0 8 0 amappl11 160 3 0 3 1 1 0 1 0 8 0 amappl10 152 61 0 51 1 0 1 1 0 8 0 amappl9 144 260 0 260 1 1 0 1 0 8 0 amappl8 136 100 0 99 1 0 1 1 0 8 0 amappl7 128 145 0 134 1 0 1 1 0 8 0 amappl6 120 163 0 161 1 0 1 1 0 8 0 amappl5 112 106 0 99 1 0 1 1 0 8 0 amappl4 104 277 0 261 1 0 1 1 0 8 0 amappl3 96 4090 0 3955 5 1 4 4 0 8 0 amappl2 88 565 0 512 2 0 2 2 0 8 0 amappl1 80 12624 0 12043 16 0 16 16 0 8 0 amappl 88 5923 0 5732 5 0 5 5 0 92 0 uvmvnodes 80 121 0 0 3 0 3 3 0 8 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 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 18 0 17 1 0 1 1 0 8 0 aobjpl 72 19 0 2 1 0 1 1 0 8 0 uaddrrnd 24 822 0 785 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 822 0 785 1 0 1 1 0 8 0 vmmpekpl 168 8814 0 8779 2 0 2 2 0 8 0 vmmpepl 168 62083 0 59785 111 2 109 111 0 357 6 vmsppl 488 821 0 784 7 1 6 6 0 8 0 rwobjpl 80 20751 0 19522 30 3 27 29 0 8 1 pdppl 4096 1651 0 1568 121 36 85 97 0 8 2 pvpl 32 18627 0 0 151 0 151 151 0 265 0 pmappl 256 821 0 784 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 305 0 41 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff83441c23) at panic+0x1e5 sys/kern/subr_prf.c:198 pool_do_get(ffffffff83a10458,1,ffff80003c4033e8) at pool_do_get+0x5df pool_get(ffffffff83a10458,1) at pool_get+0x162 sys/kern/subr_pool.c:-1 shmget_allocate_segment(ffff80003c41a2c0,ffff80003c403640,80,ffff80003c403590) at shmget_allocate_segment+0x1af sys/kern/sysv_shm.c:-1 sys_shmget(ffff80003c41a2c0,ffff80003c403640,ffff80003c403590) at sys_shmget+0x195 sys/kern/sysv_shm.c:482 syscall(ffff80003c403640) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c403640) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe802b97c8b0, count: -8 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffff8000299bdff0) 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(ffffffff83a0dbc0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a0dbc0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 exit1(ffff80003c41a7f0,0,0,1) at exit1+0x701 sys/kern/kern_exit.c:260 sys_exit(ffff80003c41a7f0,ffff80003c427220,ffff80003c427170) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c427220) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c427220) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f0fd02040f0, count: 7 ddb{1}> trace x86_ipi_db(ffff8000299bdff0) 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(ffffffff83a0dbc0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline] __mp_lock(ffffffff83a0dbc0) at __mp_lock+0x192 sys/kern/kern_lock.c:173 exit1(ffff80003c41a7f0,0,0,1) at exit1+0x701 sys/kern/kern_exit.c:260 sys_exit(ffff80003c41a7f0,ffff80003c427220,ffff80003c427170) at sys_exit+0x1a sys/kern/kern_exit.c:-1 syscall(ffff80003c427220) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80003c427220) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f0fd02040f0, count: -8