panic: unix: lock not held Stopped at db_enter+0x1c: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *132173 28589 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82865988) at panic+0x165 sys/kern/subr_prf.c:198 rw_assert_wrlock(fffffd8060ba5018) at rw_assert_wrlock+0xb7 sys/kern/kern_rwlock.c:387 filt_soread(fffffd807c7ba978,0) at filt_soread+0x123 sys/kern/uipc_socket.c:2237 knote_locked(fffffd8060ba5130,0) at knote_locked+0x78 filter_event sys/kern/kern_event.c:778 [inline] knote_locked(fffffd8060ba5130,0) at knote_locked+0x78 sys/kern/kern_event.c:1845 sowakeup(fffffd8060ba5010,fffffd8060ba50c0) at sowakeup+0x82 sys/kern/uipc_socket2.c:611 sorwakeup(fffffd8060ba5010) at sorwakeup+0xfb sys/kern/uipc_socket.c:1791 uipc_dgram_send(fffffd8060ba51f8,fffffd806d2b8b00,fffffd806d2b8500,0) at uipc_dgram_send+0x1b7 sys/kern/uipc_usrreq.c:585 sosend(fffffd8060ba51f8,fffffd806d2b8500,ffff8000379eb5a8,0,0,0) at sosend+0x663 sendit(ffff80002daee570,5,ffff8000379eb720,0,ffff8000379eb7d0) at sendit+0x555 sys/kern/uipc_syscalls.c:786 sys_sendmsg(ffff80002daee570,ffff8000379eb880,ffff8000379eb7d0) at sys_sendmsg+0x19e sys/kern/uipc_syscalls.c:604 syscall(ffff8000379eb880) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x13f6c484130, count: 2 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: unix: lock not held ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82865988) at panic+0x165 sys/kern/subr_prf.c:198 rw_assert_wrlock(fffffd8060ba5018) at rw_assert_wrlock+0xb7 sys/kern/kern_rwlock.c:387 filt_soread(fffffd807c7ba978,0) at filt_soread+0x123 sys/kern/uipc_socket.c:2237 knote_locked(fffffd8060ba5130,0) at knote_locked+0x78 filter_event sys/kern/kern_event.c:778 [inline] knote_locked(fffffd8060ba5130,0) at knote_locked+0x78 sys/kern/kern_event.c:1845 sowakeup(fffffd8060ba5010,fffffd8060ba50c0) at sowakeup+0x82 sys/kern/uipc_socket2.c:611 sorwakeup(fffffd8060ba5010) at sorwakeup+0xfb sys/kern/uipc_socket.c:1791 uipc_dgram_send(fffffd8060ba51f8,fffffd806d2b8b00,fffffd806d2b8500,0) at uipc_dgram_send+0x1b7 sys/kern/uipc_usrreq.c:585 sosend(fffffd8060ba51f8,fffffd806d2b8500,ffff8000379eb5a8,0,0,0) at sosend+0x663 sendit(ffff80002daee570,5,ffff8000379eb720,0,ffff8000379eb7d0) at sendit+0x555 sys/kern/uipc_syscalls.c:786 sys_sendmsg(ffff80002daee570,ffff8000379eb880,ffff8000379eb7d0) at sys_sendmsg+0x19e sys/kern/uipc_syscalls.c:604 syscall(ffff8000379eb880) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x13f6c484130, count: -13 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff8000379eb210 rbx 0xffffffff82ca5ff0 cpu_info_full_primary+0x1ff0 rdx 0xffff800000e60180 rcx 0 rax 0xffff80002daee570 r8 0x101010101010101 r9 0x8080808080808080 r10 0xaa81f97f35450ee r11 0xcad2fc8796d2eadb r12 0 r13 0 r14 0 r15 0x1 rip 0xffffffff811a086c db_enter+0x1c cs 0x8 rflags 0x246 rsp 0xffff8000379eb200 ss 0x10 db_enter+0x1c: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) tid=132173 pid=28589 tcnt=3 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=84, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0xffffffffffffffff, list=0xffff80002daefd58,0xffff80002daef2c8 process=0xffff8000378a2a08 user=0xffff8000379e6000, vmspace=0xfffffd8061051c90 estcpu=34, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 44318 130744 11290 0 2 0 syz-executor.6 44318 475454 11290 0 2 0x4000000 syz-executor.6 84563 128720 75335 0 2 0 syz-executor.5 84563 363328 75335 0 3 0x4000080 fsleep syz-executor.5 90871 190493 18486 0 2 0 syz-executor.2 90871 132300 18486 0 3 0x4000080 fsleep syz-executor.2 90871 350572 18486 0 3 0x4000080 fsleep syz-executor.2 77330 360895 78844 0 2 0 syz-executor.1 77330 351119 78844 0 3 0x4000080 fsleep syz-executor.1 52513 286165 29356 0 2 0 syz-executor.7 52513 180388 29356 0 3 0x4000080 kqread syz-executor.7 52513 290543 29356 0 3 0x4000080 fsleep syz-executor.7 28589 270349 96704 0 2 0 syz-executor.0 28589 262825 96704 0 3 0x4000080 kqread syz-executor.0 *28589 132173 96704 0 7 0x4000000 syz-executor.0 27205 284752 60481 0 3 0x80 nanoslp syz-executor.3 27205 399161 60481 0 3 0x4000080 netcon2 syz-executor.3 62807 474253 77357 0 3 0x82 nanoslp syz-executor.4 11290 409289 77357 0 3 0x82 nanoslp syz-executor.6 78844 34080 77357 0 3 0x82 nanoslp syz-executor.1 96704 70566 77357 0 3 0x82 nanoslp syz-executor.0 60481 29236 77357 0 3 0x82 nanoslp syz-executor.3 75335 421331 77357 0 3 0x82 nanoslp syz-executor.5 29356 363800 77357 0 3 0x82 nanoslp syz-executor.7 18486 176490 77357 0 3 0x82 nanoslp syz-executor.2 85681 409794 0 0 3 0x14280 nfsidl nfsio 43261 210403 0 0 3 0x14280 nfsidl nfsio 85293 326304 0 0 3 0x14280 nfsidl nfsio 21814 61583 0 0 3 0x14280 nfsidl nfsio 59034 345013 0 0 3 0x14280 nfsidl nfsio 44910 227198 0 0 3 0x14280 nfsidl nfsio 81957 256164 0 0 3 0x14280 nfsidl nfsio 77500 198591 0 0 3 0x14280 nfsidl nfsio 11169 326877 0 0 3 0x14280 nfsidl nfsio 92970 135521 0 0 3 0x14280 nfsidl nfsio 68727 48736 0 0 3 0x14280 nfsidl nfsio 40225 88025 0 0 3 0x14280 nfsidl nfsio 1759 411791 0 0 3 0x14280 nfsidl nfsio 54400 114181 0 0 3 0x14280 nfsidl nfsio 62874 128485 0 0 3 0x14280 nfsidl nfsio 15932 25577 0 0 3 0x14280 nfsidl nfsio 69899 320549 0 0 3 0x14280 nfsidl nfsio 76892 70286 0 0 3 0x14280 nfsidl nfsio 35441 223202 0 0 3 0x14280 nfsidl nfsio 79947 337860 0 0 3 0x14280 nfsidl nfsio 55092 452490 1 0 3 0x18100083 ttyopn getty 42260 48933 0 0 3 0x14200 acct acct 34871 480639 0 0 3 0x14200 bored sosplice 77357 399009 2502 0 3 0x1a000082 wait syz-fuzzer 77357 394242 2502 0 3 0x1e000082 thrsleep syz-fuzzer 77357 510546 2502 0 3 0x1e000082 thrsleep syz-fuzzer 77357 107980 2502 0 3 0x1e000082 kqread syz-fuzzer 77357 494824 2502 0 3 0x1e000082 thrsleep syz-fuzzer 77357 156616 2502 0 3 0x1e000082 wait syz-fuzzer 77357 48782 2502 0 3 0x1e000082 wait syz-fuzzer 77357 402040 2502 0 3 0x1e000082 wait syz-fuzzer 77357 130651 2502 0 3 0x1e000082 thrsleep syz-fuzzer 77357 88666 2502 0 3 0x1e000082 wait syz-fuzzer 77357 365519 2502 0 3 0x1e000082 thrsleep syz-fuzzer 77357 154622 2502 0 3 0x1e000082 wait syz-fuzzer 77357 197078 2502 0 3 0x1e000082 wait syz-fuzzer 77357 124692 2502 0 3 0x1e000082 thrsleep syz-fuzzer 77357 76501 2502 0 3 0x1e000082 wait syz-fuzzer 2502 310655 64307 0 3 0x810008a sigsusp ksh 64307 185051 76184 0 3 0x1800009a kqread sshd 76184 8214 1 0 3 0x18000088 kqread sshd 8367 44528 97816 73 3 0x19100010 biowait syslogd 97816 488654 1 0 3 0x18100082 netio syslogd 76453 390777 1 0 3 0x18100080 kqread resolvd 32766 514237 5390 77 3 0x18100092 kqread dhcpleased 33462 84193 5390 77 3 0x18100092 kqread dhcpleased 5390 275104 1 0 3 0x18000080 kqread dhcpleased 29285 303018 0 0 3 0x14200 bored smr 18083 353550 0 0 2 0x14200 zerothread 19416 144804 0 0 3 0x14200 aiodoned aiodoned 15023 146590 0 0 3 0x14200 syncer update 62168 479412 0 0 3 0x14200 cleaner cleaner 9677 341482 0 0 3 0x14200 reaper reaper 28731 118242 0 0 3 0x14200 pgdaemon pagedaemon 26205 60609 0 0 3 0x14200 bored viomb 14293 276949 0 0 3 0x40014200 acpi0 acpi0 63608 240701 0 0 3 0x14200 bored softnet3 65382 251158 0 0 3 0x14200 bored softnet2 90436 125511 0 0 3 0x14200 bored softnet1 28420 74940 0 0 3 0x14200 bored softnet0 41743 32304 0 0 3 0x14200 bored systqmp 73104 481522 0 0 3 0x14200 bored systq 99723 392389 0 0 3 0x40014200 tmoslp softclock 54033 233310 0 0 3 0x40014200 idle0 1 345753 0 0 3 0x8000082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10216 6439K 14624K 166960K 80954 0 pcb 15 20K 22K 166960K 2011 0 rtable 249 12K 12K 166960K 8821 0 pf 35 9K 10K 166960K 1006 0 ifaddr 113 32K 33K 166960K 1165 0 ifgroup 60 2K 2K 166960K 1629 0 sysctl 4 1K 1K 166960K 10 0 counters 33 17K 17K 166960K 477 0 ioctlops 0 0K 2K 166960K 2590 0 iov 0 0K 36K 166960K 3901 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1814 114K 114K 166960K 25936 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 157 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 5823 0 dirhash 12 2K 2K 166960K 147 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 17 61K 81K 166960K 32849 0 sigio 0 0K 0K 166960K 1321 0 proc 58 59K 92K 166960K 7216 0 subproc 104 6K 6K 166960K 2615 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 1 0K 0K 166960K 1885 0 in_multi 100 7K 7K 166960K 2522 0 ether_multi 2 0K 0K 166960K 36 0 mrt 4 0K 0K 166960K 57 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 253 1129K 1129K 166960K 253 0 exec 0 0K 1K 166960K 6255 0 pfkey data 0 0K 0K 166960K 35 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 674 1176K 1186K 166960K 296507 0 UVM aobj 131 4K 5K 166960K 137 0 pinsyscall 22 44K 100K 166960K 7706 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 1K 166960K 895 0 NDP 14 0K 1K 166960K 864 0 temp 75 6804K 7440K 166960K 258507 0 kqueue 13 20K 30K 166960K 2610 0 SYN cache 2 104K 112K 166960K 3 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 1651 0 1647 4 1 3 3 0 8 2 rtentry 112 2975 0 2864 4 0 4 4 0 8 0 unpcb 144 27297 0 27281 19 11 8 11 0 8 6 syncache 336 319 0 319 2 1 1 1 0 8 1 tcpqe 32 356 56 356 2 1 1 1 0 8 1 tcpcb 808 11134 0 11128 38 29 9 15 0 8 8 arp 88 553 0 534 1 0 1 1 0 8 0 ipq 40 45 0 44 1 0 1 1 0 8 0 ipqe 40 457 0 456 1 0 1 1 0 8 0 inpcb 360 26703 0 26693 107 98 9 20 0 8 8 nd6 104 615 0 591 1 0 1 1 0 8 0 pkpcb 40 444 0 444 2 1 1 1 0 8 1 kcovpl 48 200 0 192 1 0 1 1 0 8 0 ppxss 1072 149 0 148 1 0 1 1 0 8 0 art_heap8 4096 40 0 39 3 2 1 3 0 8 0 art_heap4 256 10328 0 9867 75 46 29 31 0 8 0 art_table 32 10368 0 9906 4 0 4 4 0 8 0 art_node 16 2929 0 2828 1 0 1 1 0 8 0 sysvmsgpl 40 27 0 20 1 0 1 1 0 8 0 semapl 112 5817 0 5807 1 0 1 1 0 8 0 shmpl 112 134 0 6 4 0 4 4 0 8 0 dirhash 1024 107 0 90 3 0 3 3 0 8 0 dino2pl 256 44370 0 42686 106 0 106 106 0 8 0 ffsino 240 44370 0 42686 100 0 100 100 0 8 0 nchpl 144 87295 0 85562 66 0 66 66 0 8 0 uvmvnodes 80 9150 0 0 187 0 187 187 0 8 0 vnodes 216 9150 0 0 509 0 509 509 0 8 0 namei 1024 318220 0 318220 3 1 2 2 0 8 2 vcpupl 2048 371 0 0 47 0 47 47 0 8 0 vmpool 664 471 0 100 31 0 31 31 0 8 0 kstatmem 264 916 0 888 2 0 2 2 0 8 0 scxspl 216 273879 0 273878 11 7 4 8 1 8 3 plimitpl 152 3644 0 3629 1 0 1 1 0 8 0 sigapl 424 33147 0 33080 10 2 8 8 0 8 0 futexpl 64 301892 0 301887 1 0 1 1 0 8 0 knotepl 120 282052 0 281969 32 20 12 18 0 8 8 kqueuepl 184 5918 0 5908 10 6 4 7 0 8 3 pipepl 288 6333 0 6305 17 8 9 11 0 8 7 fdescpl 432 32724 0 32696 4 0 4 4 0 8 0 filepl 120 206620 0 206376 33 19 14 20 0 8 5 lockfpl 104 9501 0 9499 3 1 2 2 0 8 1 lockfspl 48 3494 0 3492 1 0 1 1 0 8 0 sessionpl 144 218 0 202 1 0 1 1 0 8 0 pgrppl 48 545 0 529 1 0 1 1 0 8 0 ucredpl 104 28571 0 28558 1 0 1 1 0 8 0 zombiepl 144 33081 0 33080 1 0 1 1 0 8 0 processpl 1072 33147 0 33080 6 1 5 5 0 8 0 procpl 680 80057 0 79966 10 1 9 9 0 8 1 sosppl 168 374 0 374 2 1 1 1 0 8 1 sockpl 488 56155 0 56125 916 895 21 54 0 8 16 mcl64k 65536 1398 0 1398 2 1 1 1 0 8 1 mcl16k 16384 708 0 708 2 1 1 1 0 8 1 mcl12k 12288 1305 0 1305 2 1 1 1 0 8 1 mcl9k 9216 514 0 514 2 1 1 1 0 8 1 mcl8k 8192 2503 0 2503 2 1 1 1 0 8 1 mcl4k 4096 3501 0 3501 5 1 4 4 0 8 4 mcl2k2 2112 284 0 284 2 1 1 1 0 8 1 mcl2k 2048 145023 0 144976 69 54 15 38 0 8 8 mtagpl 96 7493 0 7454 24 16 8 17 0 8 7 mbufpl 256 514127 0 513914 724 708 16 101 0 8 1 bufpl 280 57933 0 48782 654 0 654 654 0 8 0 anonpl 24 3039340 0 3025659 177 13 164 164 0 188 49 amapchunkpl 152 950714 0 949778 77 11 66 66 0 158 23 amappl16 200 58395 0 57872 111 74 37 43 0 8 8 amappl15 192 224 0 223 1 0 1 1 0 8 0 amappl14 184 758 0 740 2 1 1 2 0 8 0 amappl13 176 43 0 42 1 0 1 1 0 8 0 amappl12 168 36219 0 36182 2 0 2 2 0 8 0 amappl11 160 51 0 41 1 0 1 1 0 8 0 amappl10 152 432 0 415 1 0 1 1 0 8 0 amappl9 144 383 0 383 2 1 1 1 0 8 1 amappl8 136 1319 0 1200 5 0 5 5 0 8 0 amappl7 128 209 0 193 1 0 1 1 0 8 0 amappl6 120 2911 0 2889 2 1 1 2 0 8 0 amappl5 112 1584 0 1571 1 0 1 1 0 8 0 amappl4 104 2305 0 2270 3 1 2 2 0 8 1 amappl3 96 182638 0 182540 3 0 3 3 0 8 0 amappl2 88 34924 0 34852 4 2 2 4 0 8 0 amappl1 80 137685 0 137195 21 9 12 21 0 8 0 amappl 88 293729 0 293388 9 0 9 9 0 92 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 72 136 0 6 3 0 3 3 0 8 0 uaddrrnd 24 33195 0 32796 3 0 3 3 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 33195 0 32796 3 0 3 3 0 8 0 vmmpekpl 168 220779 0 220669 5 0 5 5 0 8 0 vmmpepl 168 1994964 0 1992128 194 35 159 160 0 357 16 vmsppl 352 33194 0 32796 37 0 37 37 0 8 0 rwobjpl 24 443055 0 432057 67 0 67 67 0 8 0 pdppl 4096 66396 0 65963 2124 1689 435 443 0 8 2 pvpl 32 8732675 0 8713030 503 205 298 388 0 265 100 pmappl 216 33194 0 32796 23 0 23 23 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 3335 0 2545 24 0 24 24 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82865988) at panic+0x165 sys/kern/subr_prf.c:198 rw_assert_wrlock(fffffd8060ba5018) at rw_assert_wrlock+0xb7 sys/kern/kern_rwlock.c:387 filt_soread(fffffd807c7ba978,0) at filt_soread+0x123 sys/kern/uipc_socket.c:2237 knote_locked(fffffd8060ba5130,0) at knote_locked+0x78 filter_event sys/kern/kern_event.c:778 [inline] knote_locked(fffffd8060ba5130,0) at knote_locked+0x78 sys/kern/kern_event.c:1845 sowakeup(fffffd8060ba5010,fffffd8060ba50c0) at sowakeup+0x82 sys/kern/uipc_socket2.c:611 sorwakeup(fffffd8060ba5010) at sorwakeup+0xfb sys/kern/uipc_socket.c:1791 uipc_dgram_send(fffffd8060ba51f8,fffffd806d2b8b00,fffffd806d2b8500,0) at uipc_dgram_send+0x1b7 sys/kern/uipc_usrreq.c:585 sosend(fffffd8060ba51f8,fffffd806d2b8500,ffff8000379eb5a8,0,0,0) at sosend+0x663 sendit(ffff80002daee570,5,ffff8000379eb720,0,ffff8000379eb7d0) at sendit+0x555 sys/kern/uipc_syscalls.c:786 sys_sendmsg(ffff80002daee570,ffff8000379eb880,ffff8000379eb7d0) at sys_sendmsg+0x19e sys/kern/uipc_syscalls.c:604 syscall(ffff8000379eb880) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x13f6c484130, count: -13 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82865988) at panic+0x165 sys/kern/subr_prf.c:198 rw_assert_wrlock(fffffd8060ba5018) at rw_assert_wrlock+0xb7 sys/kern/kern_rwlock.c:387 filt_soread(fffffd807c7ba978,0) at filt_soread+0x123 sys/kern/uipc_socket.c:2237 knote_locked(fffffd8060ba5130,0) at knote_locked+0x78 filter_event sys/kern/kern_event.c:778 [inline] knote_locked(fffffd8060ba5130,0) at knote_locked+0x78 sys/kern/kern_event.c:1845 sowakeup(fffffd8060ba5010,fffffd8060ba50c0) at sowakeup+0x82 sys/kern/uipc_socket2.c:611 sorwakeup(fffffd8060ba5010) at sorwakeup+0xfb sys/kern/uipc_socket.c:1791 uipc_dgram_send(fffffd8060ba51f8,fffffd806d2b8b00,fffffd806d2b8500,0) at uipc_dgram_send+0x1b7 sys/kern/uipc_usrreq.c:585 sosend(fffffd8060ba51f8,fffffd806d2b8500,ffff8000379eb5a8,0,0,0) at sosend+0x663 sendit(ffff80002daee570,5,ffff8000379eb720,0,ffff8000379eb7d0) at sendit+0x555 sys/kern/uipc_syscalls.c:786 sys_sendmsg(ffff80002daee570,ffff8000379eb880,ffff8000379eb7d0) at sys_sendmsg+0x19e sys/kern/uipc_syscalls.c:604 syscall(ffff8000379eb880) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x13f6c484130, count: -13