kernel: page fault trap, code=10 Stopped at 0 TID PID UID PRFLAGS PFLAGS CPU COMMAND *408820 18823 0 0x8000000 0x4000080 1 syz-executor.1 160139 18823 0 0x8000000 0x4000000 0 syz-executor.1 end trace frame: 0x0, 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: attempt to execute user address 0x0 in supervisor mode ddb{1}> trace end trace frame: 0x0, count: -1 ddb{1}> show registers rdi 0 rsi 0xffff80002ecffc60 rbp 0 rbx 0 rdx 0x6b029002 rcx 0 rax 0x800000007e75b001 r8 0 r9 0x1 r10 0 r11 0x8c310558e6fb3629 r12 0 r13 0 r14 0 r15 0 rip 0 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff800032558430 ss 0 0 ddb{1}> show proc PROC (syz-executor.1) tid=408820 pid=18823 tcnt=3 stat=onproc flags process=8000000 proc=4000080 runpri=24, usrpri=83, slppri=24, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0xffffffffffffffff, list=0xffff80002ecfed00,0xffff80002ecfea80 process=0xffff8000ffff70e8 user=0xffff800032553000, vmspace=0xfffffd806b53c6f8 estcpu=33, cpticks=1, pctcpu=0.0, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 72552 422385 7848 0 2 0x8000000 syz-executor.2 72552 424426 7848 0 3 0xc000080 fsleep syz-executor.2 63104 133152 9860 0 2 0x8000000 syz-executor.3 63104 67135 9860 0 3 0xc000080 kqread syz-executor.3 77313 454994 43904 0 2 0x8000000 syz-executor.6 77313 25142 43904 0 3 0xc000080 netio syz-executor.6 77313 465736 43904 0 3 0xc000080 netcon2 syz-executor.6 18823 311900 95931 0 2 0x8000000 syz-executor.1 *18823 408820 95931 0 7 0xc000080 syz-executor.1 18823 160139 95931 0 7 0xc000000 syz-executor.1 36115 149733 60982 0 3 0x8000080 nanoslp syz-executor.0 36115 136351 60982 0 3 0xc000080 kqread syz-executor.0 36115 119345 60982 0 3 0xc000080 fsleep syz-executor.0 45442 204823 1 0 3 0x18100083 ttyin getty 85185 85615 38792 0 3 0x8000082 nanoslp syz-executor.4 10180 89735 38792 0 3 0x8000082 nanoslp syz-executor.5 59422 202047 0 0 3 0x14200 bored sosplice 84632 279114 38792 0 3 0x8000002 biowait syz-executor.7 43904 503192 38792 0 3 0x8000082 nanoslp syz-executor.6 7848 123097 38792 0 2 0x8000002 syz-executor.2 95931 21819 38792 0 3 0x8000082 nanoslp syz-executor.1 9860 415632 38792 0 2 0x8000002 syz-executor.3 60982 262582 38792 0 3 0x8000082 nanoslp syz-executor.0 38792 302256 19207 0 3 0x1a000082 thrsleep syz-fuzzer 38792 483357 19207 0 3 0x1e000082 nanoslp syz-fuzzer 38792 402253 19207 0 3 0x1e000082 wait syz-fuzzer 38792 470971 19207 0 3 0x1e000082 kqread syz-fuzzer 38792 320722 19207 0 3 0x1e000082 thrsleep syz-fuzzer 38792 486958 19207 0 3 0x1e000082 wait syz-fuzzer 38792 73288 19207 0 3 0x1e000082 wait syz-fuzzer 38792 106423 19207 0 3 0x1e000082 wait syz-fuzzer 38792 155946 19207 0 3 0x1e000082 thrsleep syz-fuzzer 38792 22127 19207 0 3 0x1e000082 wait syz-fuzzer 38792 292564 19207 0 3 0x1e000082 thrsleep syz-fuzzer 38792 7657 19207 0 3 0x1e000082 wait syz-fuzzer 38792 163864 19207 0 3 0x1e000082 wait syz-fuzzer 38792 338018 19207 0 3 0x1e000082 wait syz-fuzzer 38792 119939 19207 0 3 0x1e000082 thrsleep syz-fuzzer 38792 142762 19207 0 3 0x1e000082 thrsleep syz-fuzzer 19207 140538 34209 0 3 0x810008a sigsusp ksh 34209 149502 23248 0 3 0x1800009a kqread sshd 23248 26617 1 0 3 0x18000088 kqread sshd 83564 422102 60138 74 3 0x19100092 bpf pflogd 60138 318291 1 0 3 0x18000080 sbwait pflogd 85350 225006 79766 73 3 0x19100090 kqread syslogd 79766 364355 1 0 3 0x18100082 sbwait syslogd 68961 260187 1 0 3 0x18100080 kqread resolvd 31951 110316 84906 77 3 0x18100092 kqread dhcpleased 61654 500654 84906 77 3 0x18100092 kqread dhcpleased 84906 241967 1 0 3 0x18000080 kqread dhcpleased 24246 523405 0 0 3 0x14200 bored smr 23714 245097 0 0 2 0x14200 zerothread 26002 521034 0 0 3 0x14200 aiodoned aiodoned 14074 187612 0 0 3 0x14200 syncer update 18546 243991 0 0 3 0x14200 cleaner cleaner 94959 210713 0 0 3 0x14200 reaper reaper 31899 219764 0 0 3 0x14200 pgdaemon pagedaemon 1707 522093 0 0 3 0x14200 bored viomb 56705 110970 0 0 3 0x40014200 acpi0 acpi0 24656 24606 0 0 3 0x40014200 idle1 57957 149531 0 0 3 0x14200 bored softnet3 60451 414678 0 0 3 0x14200 bored softnet2 29686 43850 0 0 3 0x14200 bored softnet1 24953 518728 0 0 3 0x14200 bored softnet0 67436 353503 0 0 3 0x14200 bored systqmp 5744 259438 0 0 3 0x14200 bored systq 12444 494906 0 0 3 0x14200 tmoslp softclockmp 55970 439867 0 0 3 0x40014200 tmoslp softclock 91253 420504 0 0 3 0x40014200 idle0 1 379317 0 0 3 0x8000082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive sched_lock &sched_lock r = 0 (0xffffffff82e27c70) #0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x446 sys/kern/subr_witness.c:1187 #1 preempt+0x3a sys/kern/sched_bsd.c:340 #2 ast+0x10b mi_ast sys/sys/syscall_mi.h:262 [inline] #2 ast+0x10b sys/arch/amd64/amd64/trap.c:541 #3 intr_user_exit+0x3c Process 18823 (syz-executor.1) thread 0xffff80002ecfe7e0 (160139) exclusive rwlock unix r = 0 (0xffff800000e81520) #0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x446 sys/kern/subr_witness.c:1187 #1 unp_detach+0xef sys/kern/uipc_usrreq.c:771 #2 uipc_detach+0x37 sys/kern/uipc_usrreq.c:311 #3 soclose+0x83 pru_detach sys/sys/protosw.h:284 [inline] #3 soclose+0x83 sys/kern/uipc_socket.c:425 #4 soo_close+0x44 #5 fdrop+0xd5 sys/kern/kern_descrip.c:1274 #6 closef+0x120 sys/kern/kern_descrip.c:1258 #7 finishdup+0x311 sys/kern/kern_descrip.c:686 #8 syscall+0x8cf mi_syscall sys/sys/syscall_mi.h:180 [inline] #8 syscall+0x8cf sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 Process 84632 (syz-executor.7) thread 0xffff80002a1491f8 (279114) exclusive rrwlock inode r = 0 (0xfffffd80730790a0) #0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x446 sys/kern/subr_witness.c:1187 #1 rw_enter+0x32d sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x91 sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 ufs_ihashins+0x46 #5 ffs_vget+0x141 sys/ufs/ffs/ffs_vfsops.c:1230 #6 ffs_inode_alloc+0x1e4 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0xe6 sys/ufs/ufs/ufs_vnops.c:1117 #8 VOP_MKDIR+0xc3 sys/kern/vfs_vops.c:388 #9 domkdirat+0x125 sys/kern/vfs_syscalls.c:3077 #10 syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline] #10 syscall+0x854 sys/arch/amd64/amd64/trap.c:577 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd807e731b48) #0 witness_lock+0x446 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x446 sys/kern/subr_witness.c:1187 #1 rw_enter+0x32d sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x91 sys/kern/kern_rwlock.c:464 #3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518 #4 vn_lock+0x85 sys/kern/vfs_vnops.c:564 #5 vfs_lookup+0xd3 sys/kern/vfs_lookup.c:418 #6 namei+0x56a sys/kern/vfs_lookup.c:250 #7 domkdirat+0x79 sys/kern/vfs_syscalls.c:3062 #8 syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline] #8 syscall+0x854 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10202 6561K 7012K 166960K 11957 0 pcb 17 12K 12K 166960K 128 0 rtable 243 7K 7K 166960K 500 0 pf 34 9K 10K 166960K 52 0 ifaddr 46 15K 15K 166960K 61 0 ifgroup 59 2K 2K 166960K 72 0 sysctl 1 1K 1K 166960K 3 0 counters 66 36K 36K 166960K 72 0 ioctlops 0 0K 4K 166960K 1515 0 iov 1 4K 24K 166960K 35 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1365 86K 86K 166960K 1764 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 9 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 44 0 dirhash 12 2K 2K 166960K 21 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 15 53K 78K 166960K 621 0 sigio 0 0K 0K 166960K 16 0 proc 70 91K 127K 166960K 623 0 subproc 104 6K 6K 166960K 132 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 68 0 in_multi 99 7K 7K 166960K 137 0 ether_multi 1 0K 0K 166960K 2 0 mrt 1 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 79 360K 360K 166960K 79 0 exec 0 0K 1K 166960K 500 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 282 76K 93K 166960K 7989 0 UVM aobj 17 4K 4K 166960K 20 0 pinsyscall 39 78K 108K 166960K 1882 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 2 0K 1K 166960K 41 0 NDP 13 0K 2K 166960K 36 0 temp 77 6816K 7310K 166960K 15360 0 kqueue 14 22K 28K 166960K 116 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 94 0 91 1 0 1 1 0 8 0 rtentry 112 159 0 46 4 0 4 4 0 8 0 unpcb 144 489 0 469 3 2 1 2 0 8 0 syncache 336 4 0 4 1 1 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 100 0 100 2 2 0 1 0 8 0 tcpcb 808 156 0 148 2 1 1 2 0 8 0 arp 120 29 0 11 1 0 1 1 0 8 0 inpcb 384 750 0 736 9 1 8 8 0 8 6 nd6 136 37 0 10 1 0 1 1 0 8 0 pkpcb 40 3 0 3 2 2 0 1 0 8 0 kcovpl 48 10 0 2 1 0 1 1 0 8 0 pffrag 232 7 0 6 2 1 1 1 0 482 0 pffrnode 88 7 0 6 2 1 1 1 0 8 0 pffrent 40 98 0 97 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 pfstitem 24 74 0 29 1 0 1 1 0 8 0 pfstkey 128 74 0 29 2 0 2 2 0 8 0 pfstate 376 74 0 29 5 0 5 5 0 8 0 pfrule 1344 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 589 0 119 30 0 30 30 0 8 0 art_table 32 590 0 119 4 0 4 4 0 8 0 art_node 16 156 0 53 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 4 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 42 0 32 1 0 1 1 0 8 0 shmpl 112 17 0 3 1 0 1 1 0 8 0 dirhash 1024 23 0 6 3 0 3 3 0 8 0 dino2pl 256 2398 0 880 96 0 96 96 0 8 0 ffsino 272 2398 0 880 102 0 102 102 0 8 0 nchpl 144 3438 0 1698 67 0 67 67 0 8 0 uvmvnodes 80 2773 0 0 57 0 57 57 0 8 0 vnodes 216 2773 0 0 155 0 155 155 0 8 0 namei 1024 11839 0 11838 3 2 1 2 0 8 0 percpumem 16 50 0 3 1 0 1 1 0 8 0 vcpupl 3904 3 0 1 1 0 1 1 0 8 0 vmpool 696 7 0 5 1 0 1 1 0 8 0 kstatmem 264 32 0 6 2 0 2 2 0 8 0 scxspl 216 15929 0 15928 12 10 2 8 1 8 1 plimitpl 152 105 0 89 1 0 1 1 0 8 0 sigapl 424 946 0 897 7 0 7 7 0 8 0 futexpl 64 8510 0 8508 1 0 1 1 0 8 0 knotepl 120 384 0 0 11 0 11 11 0 8 0 kqueuepl 216 189 0 178 1 0 1 1 0 8 0 pipepl 320 212 0 183 3 0 3 3 0 8 0 fdescpl 496 927 0 899 5 0 5 5 0 8 0 filepl 152 5417 0 5158 15 2 13 13 0 8 2 lockfpl 104 194 0 191 1 0 1 1 0 8 0 lockfspl 48 83 0 80 1 0 1 1 0 8 0 sessionpl 144 27 0 10 1 0 1 1 0 8 0 pgrppl 48 35 0 18 1 0 1 1 0 8 0 ucredpl 104 762 0 750 1 0 1 1 0 8 0 zombiepl 144 899 0 897 1 0 1 1 0 8 0 processpl 1136 946 0 897 4 0 4 4 0 8 0 procpl 656 1567 0 1495 7 0 7 7 0 8 0 sosppl 168 10 0 10 4 3 1 1 0 8 1 sockpl 664 1340 0 1303 11 2 9 9 0 8 5 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 314 0 0 40 0 40 40 0 8 0 mtagpl 96 19 0 0 1 0 1 1 0 8 0 mbufpl 256 450 0 0 26 0 26 26 0 8 0 bufpl 280 6356 0 183 441 0 441 441 0 8 0 anonpl 24 254250 0 248511 69 17 52 66 0 186 11 amapchunkpl 152 26100 0 25436 41 11 30 40 0 158 0 amappl16 200 6241 0 6122 8 0 8 8 0 8 0 amappl15 192 14 0 14 1 1 0 1 0 8 0 amappl14 184 167 0 154 2 1 1 2 0 8 0 amappl13 176 8 0 8 1 1 0 1 0 8 0 amappl12 168 1653 0 1621 4 1 3 3 0 8 0 amappl11 160 63 0 49 1 0 1 1 0 8 0 amappl10 152 40 0 32 1 0 1 1 0 8 0 amappl9 144 202 0 199 1 0 1 1 0 8 0 amappl8 136 130 0 94 2 0 2 2 0 8 0 amappl7 128 61 0 50 1 0 1 1 0 8 0 amappl6 120 411 0 393 2 1 1 2 0 8 0 amappl5 112 180 0 164 1 0 1 1 0 8 0 amappl4 104 604 0 562 3 1 2 3 0 8 0 amappl3 96 5378 0 5299 3 0 3 3 0 8 0 amappl2 88 1336 0 1262 5 3 2 5 0 8 0 amappl1 80 11492 0 10953 23 11 12 23 0 8 0 amappl 88 7374 0 7182 6 0 6 6 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 19 0 3 1 0 1 1 0 8 0 uaddrrnd 24 935 0 905 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 935 0 905 1 0 1 1 0 8 0 vmmpekpl 168 11882 0 11831 3 0 3 3 0 8 0 vmmpepl 168 76200 0 74273 125 32 93 119 0 357 3 vmsppl 440 934 0 905 5 1 4 4 0 8 0 rwobjpl 56 28473 0 24543 60 4 56 56 0 8 0 pdppl 4096 1877 0 1812 124 52 72 77 0 8 7 pvpl 32 49244 0 0 399 1 398 398 0 265 0 pmappl 248 934 0 905 3 0 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 435 0 58 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp x86_ipi_db(ffffffff82c9aff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff82e27a68) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82e27a68) at __mp_lock+0x122 sys/kern/kern_lock.c:147 wakeup_n(ffff800000e815ae,ffffffff) at wakeup_n+0x58 sys/kern/kern_synch.c:542 soisdisconnected(ffff800000e81508) at soisdisconnected+0x63 sys/kern/uipc_socket2.c:165 unp_detach(fffffd806efe3120) at unp_detach+0x26e sys/kern/uipc_usrreq.c:813 uipc_detach(ffff800000e81508) at uipc_detach+0x37 sys/kern/uipc_usrreq.c:311 soclose(ffff800000e81508,0) at soclose+0x83 pru_detach sys/sys/protosw.h:284 [inline] soclose(ffff800000e81508,0) at soclose+0x83 sys/kern/uipc_socket.c:425 soo_close(fffffd8069b9e398,ffff80002ecfe7e0) at soo_close+0x44 fdrop(fffffd8069b9e398,ffff80002ecfe7e0) at fdrop+0xd5 sys/kern/kern_descrip.c:1274 closef(fffffd8069b9e398,ffff80002ecfe7e0) at closef+0x120 sys/kern/kern_descrip.c:1258 finishdup(ffff80002ecfe7e0,fffffd806b5df900,3,4,ffff80002ed0c760,2) at finishdup+0x311 sys/kern/kern_descrip.c:686 syscall(ffff80002ed0c810) at syscall+0x8cf mi_syscall sys/sys/syscall_mi.h:180 [inline] syscall(ffff80002ed0c810) at syscall+0x8cf sys/arch/amd64/amd64/trap.c:577 end trace frame: 0xffff80002ed0c890, count: 0 ddb{0}> trace x86_ipi_db(ffffffff82c9aff0) at x86_ipi_db+0x1e sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff82e27a68) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82e27a68) at __mp_lock+0x122 sys/kern/kern_lock.c:147 wakeup_n(ffff800000e815ae,ffffffff) at wakeup_n+0x58 sys/kern/kern_synch.c:542 soisdisconnected(ffff800000e81508) at soisdisconnected+0x63 sys/kern/uipc_socket2.c:165 unp_detach(fffffd806efe3120) at unp_detach+0x26e sys/kern/uipc_usrreq.c:813 uipc_detach(ffff800000e81508) at uipc_detach+0x37 sys/kern/uipc_usrreq.c:311 soclose(ffff800000e81508,0) at soclose+0x83 pru_detach sys/sys/protosw.h:284 [inline] soclose(ffff800000e81508,0) at soclose+0x83 sys/kern/uipc_socket.c:425 soo_close(fffffd8069b9e398,ffff80002ecfe7e0) at soo_close+0x44 fdrop(fffffd8069b9e398,ffff80002ecfe7e0) at fdrop+0xd5 sys/kern/kern_descrip.c:1274 closef(fffffd8069b9e398,ffff80002ecfe7e0) at closef+0x120 sys/kern/kern_descrip.c:1258 finishdup(ffff80002ecfe7e0,fffffd806b5df900,3,4,ffff80002ed0c760,2) at finishdup+0x311 sys/kern/kern_descrip.c:686 syscall(ffff80002ed0c810) at syscall+0x8cf mi_syscall sys/sys/syscall_mi.h:180 [inline] syscall(ffff80002ed0c810) at syscall+0x8cf sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x48a5ba2b0, count: -15 ddb{0}> machine ddbcpu 1 Stopped at 0end trace frame: 0x0, count: 14 ddb{1}> trace end trace frame: 0x0, count: -1