uvm_fault(0xffffffff82bcbd30, 0xffff800020eaf004, 0, 1) -> d kernel: page fault trap, code=0 Stopped at ufs_lookup+0x4ce: movzwl 0x4(%r15,%r13,1),%ebx TID PID UID PRFLAGS PFLAGS CPU COMMAND * 94784 62922 0 0x2 0 0 syz-executor.6 ufs_lookup() at ufs_lookup+0x4ce sys/ufs/ufs/ufs_lookup.c:281 VOP_LOOKUP(fffffd807557daf8,ffff80002b1fc7f8,ffff80002b1fc828) at VOP_LOOKUP+0x58 sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002b1fc7c8) at vfs_lookup+0x6cc sys/kern/vfs_lookup.c:566 namei(ffff80002b1fc7c8) at namei+0x55a sys/kern/vfs_lookup.c:250 dounlinkat(ffff80002e838058,ffffff9c,7f7fffff5710,8) at dounlinkat+0x99 sys/kern/vfs_syscalls.c:1848 syscall(ffff80002b1fc9a0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff5700, 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(0xffffffff82bcbd30, 0xffff800020eaf004, 0, 1) -> d ddb> trace ufs_lookup() at ufs_lookup+0x4ce sys/ufs/ufs/ufs_lookup.c:281 VOP_LOOKUP(fffffd807557daf8,ffff80002b1fc7f8,ffff80002b1fc828) at VOP_LOOKUP+0x58 sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002b1fc7c8) at vfs_lookup+0x6cc sys/kern/vfs_lookup.c:566 namei(ffff80002b1fc7c8) at namei+0x55a sys/kern/vfs_lookup.c:250 dounlinkat(ffff80002e838058,ffffff9c,7f7fffff5710,8) at dounlinkat+0x99 sys/kern/vfs_syscalls.c:1848 syscall(ffff80002b1fc9a0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff5700, count: -7 ddb> show registers rdi 0 rsi 0 rbp 0xffff80002b1fc600 rbx 0 rdx 0 rcx 0xffffffff rax 0xfffffd805b271388 r8 0xffffffffffffffff r9 0xfffffd807f7d7410 r10 0xe377bb0d6e158903 r11 0xd0be08569df95929 r12 0 r13 0 r14 0 r15 0xffff800020eaf000 rip 0xffffffff81260e4e ufs_lookup+0x4ce cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff80002b1fc500 ss 0x10 ufs_lookup+0x4ce: movzwl 0x4(%r15,%r13,1),%ebx ddb> show proc PROC (syz-executor.6) pid=94784 stat=onproc flags process=2 proc=0 pri=32, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff80002e875098,0xffff8000fffec308 process=0xffff8000fffef3c0 user=0xffff80002b1f7000, vmspace=0xfffffd8069b5a570 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 99767 98108 47225 0 2 0 syz-executor.7 99767 3423 47225 0 2 0x4000000 syz-executor.7 99767 230328 47225 0 2 0x4000000 syz-executor.7 77219 245382 28477 0 2 0 syz-executor.3 51380 36841 18560 0 2 0 syz-executor.1 51380 503768 18560 0 3 0x4000080 fsleep syz-executor.1 71106 33234 89546 0 2 0 syz-executor.2 71106 232216 89546 0 3 0x4000080 fsleep syz-executor.2 47225 318205 82318 0 3 0x82 nanoslp syz-executor.7 95770 108047 82318 0 3 0x82 nanoslp syz-executor.5 *62922 94784 82318 0 7 0x2 syz-executor.6 88765 333763 1 0 3 0x100083 ttyin getty 92353 473523 82318 0 2 0x482 syz-executor.4 18560 124047 82318 0 3 0x82 nanoslp syz-executor.1 89546 468862 82318 0 3 0x82 nanoslp syz-executor.2 69634 296869 0 0 3 0x14280 nfsidl nfsio 25072 70152 0 0 3 0x14280 nfsidl nfsio 76167 64672 0 0 3 0x14280 nfsidl nfsio 19794 102019 0 0 3 0x14280 nfsidl nfsio 89300 129863 0 0 3 0x14280 nfsidl nfsio 53282 210336 0 0 3 0x14280 nfsidl nfsio 56294 6122 0 0 3 0x14280 nfsidl nfsio 17685 139071 0 0 3 0x14280 nfsidl nfsio 41209 523808 0 0 3 0x14280 nfsidl nfsio 86018 518553 0 0 3 0x14280 nfsidl nfsio 90334 462729 0 0 3 0x14280 nfsidl nfsio 7793 474765 0 0 3 0x14280 nfsidl nfsio 48021 500717 0 0 3 0x14280 nfsidl nfsio 99743 472936 0 0 3 0x14280 nfsidl nfsio 8869 175099 0 0 3 0x14280 nfsidl nfsio 62560 270568 0 0 3 0x14280 nfsidl nfsio 48935 63810 0 0 3 0x14280 nfsidl nfsio 9783 371751 0 0 3 0x14280 nfsidl nfsio 36899 1086 0 0 3 0x14280 nfsidl nfsio 88764 457032 0 0 3 0x14280 nfsidl nfsio 19688 496463 0 0 3 0x14200 bored sosplice 28477 105913 82318 0 3 0x82 nanoslp syz-executor.3 82318 37697 40987 0 3 0x82 thrsleep syz-fuzzer 82318 126699 40987 0 3 0x4000082 nanoslp syz-fuzzer 82318 89344 40987 0 3 0x4000082 wait syz-fuzzer 82318 133320 40987 0 3 0x4000082 wait syz-fuzzer 82318 345292 40987 0 3 0x4000082 thrsleep syz-fuzzer 82318 275446 40987 0 2 0x4000002 syz-fuzzer 82318 121729 40987 0 3 0x4000082 wait syz-fuzzer 82318 131637 40987 0 3 0x4000082 thrsleep syz-fuzzer 82318 305593 40987 0 3 0x4000082 wait syz-fuzzer 82318 453439 40987 0 3 0x4000082 wait syz-fuzzer 82318 266260 40987 0 3 0x4000082 thrsleep syz-fuzzer 82318 422166 40987 0 3 0x4000082 thrsleep syz-fuzzer 82318 255597 40987 0 3 0x4000082 wait syz-fuzzer 82318 7315 40987 0 3 0x4000082 wait syz-fuzzer 40987 349312 44956 0 3 0x10008a sigsusp ksh 44956 311741 7803 0 3 0x9a kqread sshd 7803 115628 1 0 3 0x88 kqread sshd 30100 30454 53826 73 3 0x1100090 kqread syslogd 53826 443922 1 0 3 0x100082 netio syslogd 7467 222312 1 0 3 0x100080 kqread resolvd 58072 429694 74154 77 3 0x100092 kqread dhcpleased 85548 259537 74154 77 3 0x100092 kqread dhcpleased 74154 134130 1 0 3 0x80 kqread dhcpleased 35814 88563 0 0 3 0x14200 bored smr 24501 356356 0 0 2 0x14200 zerothread 83430 171463 0 0 3 0x14200 aiodoned aiodoned 69050 78933 0 0 3 0x14200 syncer update 80946 508813 0 0 3 0x14200 cleaner cleaner 41167 58078 0 0 3 0x14200 reaper reaper 57069 18093 0 0 3 0x14200 pgdaemon pagedaemon 95556 88023 0 0 3 0x14200 bored viomb 87161 104644 0 0 3 0x40014200 acpi0 acpi0 37356 41159 0 0 3 0x14200 bored softnet 89437 449381 0 0 3 0x14200 bored softnet 35565 490935 0 0 3 0x14200 bored softnet 78114 436230 0 0 3 0x14200 bored softnet 54577 381105 0 0 3 0x14200 bored systqmp 74942 297043 0 0 3 0x14200 bored systq 92076 472756 0 0 3 0x40014200 bored softclock 41530 53484 0 0 3 0x40014200 idle0 1 141849 0 0 3 0x82 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 10190 6412K 6942K 78643K 15128 0 pcb 13 16K 20K 78643K 789 0 rtable 204 15K 16K 78643K 1215 0 ifaddr 72 21K 22K 78643K 444 0 sysctl 2 0K 0K 78643K 2 0 counters 27 17K 17K 78643K 230 0 ioctlops 0 0K 2K 78643K 655 0 iov 0 0K 28K 78643K 728 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1465 92K 92K 78643K 3871 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 25 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 93 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 14 49K 65K 78643K 3147 0 sigio 0 0K 0K 78643K 78 0 proc 62 67K 75K 78643K 1208 0 subproc 91 5K 6K 78643K 377 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 320 0 in_multi 92 6K 6K 78643K 384 0 ether_multi 1 0K 0K 78643K 6 0 mrt 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 67 307K 307K 78643K 67 0 exec 0 0K 1K 78643K 1215 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 64K 78643K 10 0 UVM amap 287 74K 94K 78643K 21241 0 UVM aobj 122 4K 4K 78643K 137 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 120 0 NDP 11 0K 1K 78643K 147 0 temp 120 5769K 6794K 78643K 62580 0 kqueue 12 18K 26K 78643K 269 0 SYN cache 2 16K 16K 78643K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 278 0 275 3 2 1 3 0 8 0 rtentry 112 406 0 316 4 0 4 4 0 8 0 unpcb 144 3504 0 3491 36 31 5 6 0 8 4 syncache 296 24 0 24 4 4 0 1 0 8 0 tcpqe 32 147 0 147 4 4 0 1 0 8 0 tcpcb 776 847 0 843 25 18 7 8 0 8 6 arp 88 63 0 48 1 0 1 1 0 8 0 ipq 40 5 0 5 2 2 0 1 0 8 0 ipqe 40 8 0 8 2 2 0 1 0 8 0 inpcb 336 4771 0 4762 61 54 7 13 0 8 6 nd6 48 91 0 69 1 0 1 1 0 8 0 kcovpl 48 29 0 22 1 0 1 1 0 8 0 mppekey 1024 70 0 70 3 2 1 1 0 8 1 ppxss 1160 149 0 149 6 5 1 1 0 8 1 pppxif 1360 56 0 56 6 5 1 1 0 8 1 pfstscr 40 11 0 10 1 0 1 1 0 8 0 pfanchor 1280 928 4 416 48 5 43 43 0 8 0 pfstitem 24 2 0 0 1 0 1 1 0 8 0 pfstkey 128 22 0 20 1 0 1 1 0 8 0 pfstate 352 11 0 10 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1675 0 1259 35 8 27 29 0 8 0 art_table 32 1676 0 1259 4 0 4 4 0 8 0 art_node 16 398 0 320 1 0 1 1 0 8 0 sysvmsgpl 40 41 0 1 1 0 1 1 0 8 0 semupl 112 6 0 6 1 1 0 1 0 8 0 semapl 112 24 0 14 1 0 1 1 0 8 0 shmpl 112 134 0 15 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 5737 0 4286 91 0 91 91 0 8 0 ffsino 240 5737 0 4286 86 0 86 86 0 8 0 nchpl 144 9873 0 8244 63 0 63 63 0 8 0 rtmask 32 4 0 4 2 2 0 1 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 38073 0 38072 4 3 1 3 0 8 0 vmpool 664 12 0 12 4 3 1 1 0 8 1 kstatmem 264 176 0 154 2 0 2 2 0 8 0 scsiplug 72 6 0 6 2 2 0 1 0 8 0 scxspl 216 32632 0 32632 20 19 1 8 0 8 1 plimitpl 152 384 0 370 1 0 1 1 0 8 0 sigapl 424 3423 0 3360 8 0 8 8 0 8 0 futexpl 64 30252 0 30250 2 1 1 1 0 8 0 knotepl 120 49140 0 49066 19 12 7 8 0 8 2 kqueuepl 184 675 0 667 9 8 1 4 0 8 0 pipepl 288 1492 0 1467 24 17 7 7 0 8 4 fdescpl 432 3386 0 3361 4 0 4 4 0 8 0 filepl 120 27294 0 27074 39 24 15 15 0 8 5 lockfpl 104 600 0 597 2 1 1 2 0 8 0 lockfspl 48 242 0 239 1 0 1 1 0 8 0 sessionpl 144 46 0 31 1 0 1 1 0 8 0 pgrppl 48 57 0 42 1 0 1 1 0 8 0 ucredpl 104 4227 0 4213 1 0 1 1 0 8 0 zombiepl 144 3362 0 3360 2 1 1 1 0 8 0 processpl 1008 3423 0 3360 10 1 9 9 0 8 0 procpl 696 7754 0 7674 12 3 9 9 0 8 0 sosppl 168 29 0 29 5 5 0 1 0 8 0 sockpl 456 8661 0 8636 188 176 12 29 0 8 8 mcl64k 65536 158 0 158 7 6 1 1 0 8 1 mcl16k 16384 48 0 48 7 6 1 1 0 8 1 mcl12k 12288 124 0 124 4 3 1 1 0 8 1 mcl9k 9216 77 0 77 9 8 1 1 0 8 1 mcl8k 8192 166 0 166 6 5 1 1 0 8 1 mcl4k 4096 276 0 276 5 4 1 1 0 8 1 mcl2k2 2112 29 0 29 5 5 0 1 0 8 0 mcl2k 2048 81764 0 81698 31 21 10 25 0 8 0 mtagpl 96 272 0 77 6 1 5 5 0 8 0 mbufpl 256 167386 0 166951 259 228 31 71 0 8 1 bufpl 288 9904 0 3510 458 0 458 458 0 8 0 anonpl 24 692889 0 678509 174 60 114 165 0 188 0 amapchunkpl 152 67824 0 67168 69 36 33 57 0 158 0 amappl16 200 6816 0 6207 55 22 33 43 0 8 0 amappl15 192 9 0 9 1 1 0 1 0 8 0 amappl14 184 235 0 223 2 1 1 2 0 8 0 amappl13 176 4 0 4 1 1 0 1 0 8 0 amappl12 168 657 0 654 1 0 1 1 0 8 0 amappl11 160 49 0 38 1 0 1 1 0 8 0 amappl10 152 67 0 59 1 0 1 1 0 8 0 amappl9 144 982 0 981 2 1 1 1 0 8 0 amappl8 136 252 0 190 3 0 3 3 0 8 0 amappl7 128 190 0 166 2 0 2 2 0 8 0 amappl6 120 275 0 259 2 1 1 2 0 8 0 amappl5 112 255 0 249 1 0 1 1 0 8 0 amappl4 104 746 0 719 2 1 1 2 0 8 0 amappl3 96 8977 0 8932 2 0 2 2 0 8 0 amappl2 88 3963 0 3896 3 1 2 3 0 8 0 amappl1 80 77365 0 76688 31 14 17 26 0 8 0 amappl 88 20530 0 20364 6 1 5 5 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 15 3 0 3 3 0 8 0 uaddrrnd 24 3398 0 3373 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3398 0 3373 1 0 1 1 0 8 0 vmmpekpl 168 31699 0 31646 3 0 3 3 0 8 0 vmmpepl 168 322230 0 319631 211 70 141 148 0 357 16 vmsppl 344 3397 0 3373 3 0 3 3 0 8 0 rwobjpl 24 87783 0 80072 48 0 48 48 0 8 0 pdppl 4096 6802 0 6746 278 216 62 66 0 8 6 pvpl 32 1451080 0 1431414 344 145 199 304 0 265 0 pmappl 216 3397 0 3373 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1368 0 577 24 0 24 24 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace ufs_lookup() at ufs_lookup+0x4ce sys/ufs/ufs/ufs_lookup.c:281 VOP_LOOKUP(fffffd807557daf8,ffff80002b1fc7f8,ffff80002b1fc828) at VOP_LOOKUP+0x58 sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002b1fc7c8) at vfs_lookup+0x6cc sys/kern/vfs_lookup.c:566 namei(ffff80002b1fc7c8) at namei+0x55a sys/kern/vfs_lookup.c:250 dounlinkat(ffff80002e838058,ffffff9c,7f7fffff5710,8) at dounlinkat+0x99 sys/kern/vfs_syscalls.c:1848 syscall(ffff80002b1fc9a0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff5700, count: -7 ddb> machine ddbcpu 1 No such command ddb> trace ufs_lookup() at ufs_lookup+0x4ce sys/ufs/ufs/ufs_lookup.c:281 VOP_LOOKUP(fffffd807557daf8,ffff80002b1fc7f8,ffff80002b1fc828) at VOP_LOOKUP+0x58 sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002b1fc7c8) at vfs_lookup+0x6cc sys/kern/vfs_lookup.c:566 namei(ffff80002b1fc7c8) at namei+0x55a sys/kern/vfs_lookup.c:250 dounlinkat(ffff80002e838058,ffffff9c,7f7fffff5710,8) at dounlinkat+0x99 sys/kern/vfs_syscalls.c:1848 syscall(ffff80002b1fc9a0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff5700, count: -7