uvm_fault(0xffffffff82e53d20, 0xffff800018412004, 0, 1) -> d kernel: page fault trap, code=0 Stopped at ufs_lookup+0x49b: movzwl 0x4(%r15,%rbx,1),%r14d TID PID UID PRFLAGS PFLAGS CPU COMMAND *231317 38839 0 0x2 0 0 syz-executor.0 ufs_lookup() at ufs_lookup+0x49b sys/ufs/ufs/ufs_lookup.c:279 VOP_LOOKUP(fffffd806f217db0,ffff80002a6df5a8,ffff80002a6df5d8) at VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002a6df578) at vfs_lookup+0x6df sys/kern/vfs_lookup.c:566 namei(ffff80002a6df578) at namei+0x56a sys/kern/vfs_lookup.c:250 dounlinkat(ffff80002a676ac0,ffffff9c,7bd8df39d7d0,8) at dounlinkat+0x9d sys/kern/vfs_syscalls.c:1855 syscall(ffff80002a6df740) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7bd8df39d7c0, count: 8 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: uvm_fault(0xffffffff82e53d20, 0xffff800018412004, 0, 1) -> d ddb> trace ufs_lookup() at ufs_lookup+0x49b sys/ufs/ufs/ufs_lookup.c:279 VOP_LOOKUP(fffffd806f217db0,ffff80002a6df5a8,ffff80002a6df5d8) at VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002a6df578) at vfs_lookup+0x6df sys/kern/vfs_lookup.c:566 namei(ffff80002a6df578) at namei+0x56a sys/kern/vfs_lookup.c:250 dounlinkat(ffff80002a676ac0,ffffff9c,7bd8df39d7d0,8) at dounlinkat+0x9d sys/kern/vfs_syscalls.c:1855 syscall(ffff80002a6df740) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7bd8df39d7c0, count: -7 ddb> show registers rdi 0 rsi 0 rbp 0xffff80002a6df3c0 rbx 0 rdx 0 rcx 0xffffffff rax 0xfffffd807c182900 r8 0xffffffffffffffff r9 0xfffffd807f7d7478 r10 0x12ec31daffdc00c0 r11 0x8e45e56594e0a051 r12 0 r13 0xfffffd805dae1698 r14 0 r15 0xffff800018412000 rip 0xffffffff8265967b ufs_lookup+0x49b cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff80002a6df2b0 ss 0x10 ufs_lookup+0x49b: movzwl 0x4(%r15,%rbx,1),%r14d ddb> show proc PROC (syz-executor.0) tid=231317 pid=38839 tcnt=1 stat=onproc flags process=2 proc=0 runpri=68, usrpri=68, slppri=17, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0xffffffffffffffff, list=0xffff80002a6a2ab0,0xffff80002a6a2570 process=0xffff8000ffff6e20 user=0xffff80002a6da000, vmspace=0xfffffd80517fb2f0 estcpu=36, cpticks=1, pctcpu=0.1, user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 25321 150789 34058 0 2 0 syz-executor.3 36173 98176 35895 0 2 0 syz-executor.5 36173 443956 35895 0 2 0x4000000 syz-executor.5 36173 127336 35895 0 2 0x4000000 syz-executor.5 41617 140312 3751 0 2 0 syz-executor.7 83855 458333 12362 0 2 0x482 syz-executor.4 *38839 231317 12362 0 7 0x2 syz-executor.0 3751 84789 12362 0 2 0x482 syz-executor.7 35895 271829 12362 0 2 0x482 syz-executor.5 40466 296686 1 0 3 0x18100083 ttyin getty 34714 333476 12362 0 2 0x2 syz-executor.1 36550 388090 12362 0 2 0x2 syz-executor.6 69331 52402 1 0 3 0x80 fsleep syz-executor.2 69331 99111 1 0 3 0x4000080 ttyin syz-executor.2 34058 178524 12362 0 3 0x82 nanoslp syz-executor.3 27694 423124 0 0 3 0x14200 acct acct 85554 363905 0 0 3 0x14200 bored sosplice 12362 51444 11102 0 3 0x1a000082 wait syz-fuzzer 12362 294402 11102 0 2 0x1e000482 syz-fuzzer 12362 336101 11102 0 3 0x1e000082 thrsleep syz-fuzzer 12362 512441 11102 0 3 0x1e000082 thrsleep syz-fuzzer 12362 63467 11102 0 3 0x1e000082 thrsleep syz-fuzzer 12362 354746 11102 0 3 0x1e000082 wait syz-fuzzer 12362 270170 11102 0 3 0x1e000082 kqread syz-fuzzer 12362 344996 11102 0 3 0x1e000082 wait syz-fuzzer 12362 394682 11102 0 3 0x1e000082 thrsleep syz-fuzzer 12362 30291 11102 0 3 0x1e000082 wait syz-fuzzer 12362 256559 11102 0 3 0x1e000082 thrsleep syz-fuzzer 12362 492346 11102 0 3 0x1e000082 wait syz-fuzzer 12362 139190 11102 0 3 0x1e000082 wait syz-fuzzer 12362 285116 11102 0 3 0x1e000082 wait syz-fuzzer 11102 452014 17442 0 3 0x810008a sigsusp ksh 17442 469137 73853 0 3 0x1800009a kqread sshd 73853 216415 1 0 3 0x18000088 kqread sshd 46671 523412 86674 73 3 0x19100090 kqread syslogd 86674 520293 1 0 3 0x18100082 netio syslogd 17322 184239 1 0 3 0x18100080 kqread resolvd 58126 452209 91211 77 3 0x18100092 kqread dhcpleased 4180 433647 91211 77 3 0x18100092 kqread dhcpleased 91211 230646 1 0 3 0x18000080 kqread dhcpleased 95034 175328 0 0 3 0x14200 bored smr 18513 60657 0 0 2 0x14200 zerothread 2813 56746 0 0 3 0x14200 aiodoned aiodoned 80000 106406 0 0 3 0x14200 syncer update 79500 17841 0 0 3 0x14200 cleaner cleaner 57388 462358 0 0 3 0x14200 reaper reaper 59216 490069 0 0 3 0x14200 pgdaemon pagedaemon 79742 241393 0 0 3 0x14200 bored viomb 38872 210751 0 0 3 0x40014200 acpi0 acpi0 68337 320148 0 0 3 0x14200 bored softnet3 32848 242634 0 0 3 0x14200 bored softnet2 82498 49373 0 0 3 0x14200 bored softnet1 53661 20159 0 0 3 0x14200 bored softnet0 53078 256848 0 0 3 0x14200 bored systqmp 42890 217926 0 0 3 0x14200 bored systq 20094 339174 0 0 3 0x40014200 tmoslp softclock 56996 461709 0 0 3 0x40014200 idle0 1 458514 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 10193 6559K 7727K 166960K 66139 0 pcb 15 34K 42K 166960K 1097 0 rtable 202 10K 11K 166960K 2616 0 pf 34 9K 10K 166960K 280 0 ifaddr 41 12K 13K 166960K 350 0 ifgroup 59 2K 2K 166960K 499 0 sysctl 4 1K 1K 166960K 4 0 counters 32 17K 17K 166960K 147 0 ioctlops 0 0K 2K 166960K 788 0 iov 0 0K 32K 166960K 1794 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1726 108K 109K 166960K 18271 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 17K 166960K 223 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 1441 0 dirhash 12 2K 2K 166960K 72 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 14 49K 85K 166960K 23489 0 sigio 0 0K 0K 166960K 427 0 proc 67 59K 99K 166960K 2484 0 subproc 117 7K 9K 166960K 895 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 941 0 in_multi 79 5K 7K 166960K 992 0 ether_multi 1 0K 0K 166960K 26 0 mrt 5 0K 0K 166960K 18 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 85 387K 387K 166960K 85 0 exec 0 0K 1K 166960K 2080 0 pfkey data 0 0K 0K 166960K 4 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 478 431K 433K 166960K 214850 0 UVM aobj 131 4K 6K 166960K 160 0 pinsyscall 22 44K 100K 166960K 3134 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 338 0 NDP 13 0K 2K 166960K 261 0 temp 80 6804K 6932K 166960K 774413 0 kqueue 12 18K 30K 166960K 1204 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 443 0 440 3 2 1 3 0 8 0 rtentry 112 905 0 814 4 0 4 4 0 8 0 unpcb 144 10247 0 10234 13 5 8 8 0 8 7 syncache 336 86 0 86 2 1 1 1 0 8 1 tcpqe 32 160 0 160 2 1 1 1 0 8 1 tcpcb 808 3432 0 3427 15 7 8 8 0 8 7 arp 88 176 0 161 1 0 1 1 0 8 0 ipq 40 4 0 4 2 1 1 1 0 8 1 ipqe 40 44 0 44 2 1 1 1 0 8 1 inpcb 360 10064 0 9502 95 35 60 64 0 8 8 nd6 104 205 0 187 1 0 1 1 0 8 0 pkpcb 40 43 0 43 2 1 1 1 0 8 1 kcovpl 48 66 0 57 1 0 1 1 0 8 0 ppxss 1072 18 0 18 2 1 1 1 0 8 1 art_heap8 4096 9 0 7 3 0 3 3 0 8 1 art_heap4 256 3216 0 2835 57 27 30 30 0 8 3 art_table 32 3225 0 2842 4 0 4 4 0 8 0 art_node 16 892 0 813 1 0 1 1 0 8 0 sysvmsgpl 40 26 0 13 1 0 1 1 0 8 0 semapl 112 1439 0 1429 1 0 1 1 0 8 0 shmpl 112 157 0 29 4 0 4 4 0 8 0 dirhash 1024 57 0 40 3 0 3 3 0 8 0 dino2pl 256 35563 0 33370 138 0 138 138 0 8 0 ffsino 240 35563 0 33370 130 0 130 130 0 8 0 nchpl 144 67460 0 65739 66 0 66 66 0 8 0 uvmvnodes 80 13879 0 0 284 0 284 284 0 8 0 vnodes 216 13879 0 0 772 0 772 772 0 8 0 namei 1024 222008 0 222007 4 2 2 2 0 8 1 vcpupl 2048 31 0 0 4 0 4 4 0 8 0 vmpool 664 41 0 10 3 0 3 3 0 8 0 kstatmem 264 256 0 230 2 0 2 2 0 8 0 scxspl 216 202007 0 202007 10 7 3 8 1 8 3 plimitpl 152 948 0 932 2 1 1 2 0 8 0 sigapl 424 23819 0 23775 9 1 8 9 0 8 2 futexpl 64 178498 0 178497 1 0 1 1 0 8 0 knotepl 120 188337 0 188261 6 1 5 5 0 8 2 kqueuepl 184 2884 0 2876 7 3 4 4 0 8 3 pipepl 288 3577 0 3551 14 7 7 10 0 8 4 fdescpl 432 23641 0 23616 4 0 4 4 0 8 0 filepl 120 126175 0 125926 28 11 17 20 0 8 7 lockfpl 104 5478 0 5476 3 1 2 2 0 8 1 lockfspl 48 2087 0 2085 1 0 1 1 0 8 0 sessionpl 144 82 0 65 1 0 1 1 0 8 0 pgrppl 48 240 0 223 1 0 1 1 0 8 0 ucredpl 104 25164 0 25147 1 0 1 1 0 8 0 zombiepl 144 23777 0 23775 2 1 1 1 0 8 0 processpl 1072 23819 0 23775 5 0 5 5 0 8 0 procpl 680 58196 0 58136 10 1 9 9 0 8 2 sosppl 168 148 0 148 2 1 1 1 0 8 1 sockpl 488 20804 0 20226 415 334 81 89 0 8 8 mcl64k 65536 579 0 579 2 1 1 1 0 8 1 mcl16k 16384 225 0 225 2 1 1 1 0 8 1 mcl12k 12288 578 0 578 2 1 1 1 0 8 1 mcl9k 9216 222 0 222 2 1 1 1 0 8 1 mcl8k 8192 934 0 934 2 1 1 1 0 8 1 mcl4k 4096 1632 0 1632 2 1 1 1 0 8 1 mcl2k2 2112 86 0 86 2 1 1 1 0 8 1 mcl2k 2048 82778 0 82674 48 30 18 29 0 8 1 mtagpl 96 5045 0 4264 24 2 22 22 0 8 2 mbufpl 256 303745 0 302848 294 227 67 123 0 8 8 bufpl 280 46701 0 32737 998 0 998 998 0 8 0 anonpl 24 1982598 0 1971994 137 41 96 105 0 188 20 amapchunkpl 152 673896 0 673230 49 14 35 47 0 158 2 amappl16 200 37465 0 37083 96 69 27 32 0 8 6 amappl15 192 84 0 83 1 0 1 1 0 8 0 amappl14 184 355 0 342 2 1 1 2 0 8 0 amappl13 176 63 0 63 2 1 1 1 0 8 1 amappl12 168 25174 0 25148 2 0 2 2 0 8 0 amappl11 160 69 0 58 1 0 1 1 0 8 0 amappl10 152 102 0 89 1 0 1 1 0 8 0 amappl9 144 203 0 203 2 1 1 1 0 8 1 amappl8 136 821 0 644 7 0 7 7 0 8 0 amappl7 128 92 0 78 1 0 1 1 0 8 0 amappl6 120 1127 0 1108 2 1 1 2 0 8 0 amappl5 112 642 0 630 1 0 1 1 0 8 0 amappl4 104 1113 0 1075 3 1 2 2 0 8 0 amappl3 96 134284 0 134220 3 0 3 3 0 8 0 amappl2 88 24749 0 24673 4 2 2 4 0 8 0 amappl1 80 93848 0 93364 21 9 12 21 0 8 0 amappl 88 213370 0 213159 7 0 7 7 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 72 159 0 29 3 0 3 3 0 8 0 uaddrrnd 24 23682 0 23626 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 23682 0 23626 1 0 1 1 0 8 0 vmmpekpl 168 160685 0 160625 4 0 4 4 0 8 0 vmmpepl 168 1350125 0 1347928 135 12 123 123 0 357 12 vmsppl 352 23681 0 23626 7 1 6 6 0 8 0 rwobjpl 24 313472 0 297975 96 1 95 95 0 8 0 pdppl 4096 47370 0 47283 1372 1277 95 98 0 8 8 pvpl 32 6190409 0 6174478 424 245 179 388 0 265 31 pmappl 216 23681 0 23626 4 0 4 4 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 2105 0 1585 17 0 17 17 0 8 1 ddb> machine ddbcpu 0 No such command ddb> trace ufs_lookup() at ufs_lookup+0x49b sys/ufs/ufs/ufs_lookup.c:279 VOP_LOOKUP(fffffd806f217db0,ffff80002a6df5a8,ffff80002a6df5d8) at VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002a6df578) at vfs_lookup+0x6df sys/kern/vfs_lookup.c:566 namei(ffff80002a6df578) at namei+0x56a sys/kern/vfs_lookup.c:250 dounlinkat(ffff80002a676ac0,ffffff9c,7bd8df39d7d0,8) at dounlinkat+0x9d sys/kern/vfs_syscalls.c:1855 syscall(ffff80002a6df740) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7bd8df39d7c0, count: -7 ddb> machine ddbcpu 1 No such command ddb> trace ufs_lookup() at ufs_lookup+0x49b sys/ufs/ufs/ufs_lookup.c:279 VOP_LOOKUP(fffffd806f217db0,ffff80002a6df5a8,ffff80002a6df5d8) at VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002a6df578) at vfs_lookup+0x6df sys/kern/vfs_lookup.c:566 namei(ffff80002a6df578) at namei+0x56a sys/kern/vfs_lookup.c:250 dounlinkat(ffff80002a676ac0,ffffff9c,7bd8df39d7d0,8) at dounlinkat+0x9d sys/kern/vfs_syscalls.c:1855 syscall(ffff80002a6df740) at syscall+0x538 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7bd8df39d7c0, count: -7