uvm_fault(0xffffffff83a35678, 0xffff800028f72004, 0, 1) -> d kernel: page fault trap, code=0 Stopped at ufs_lookup+0x613: movzwl 0x4(%r15,%r14,1),%ebx TID PID UID PRFLAGS PFLAGS CPU COMMAND *220384 69824 0 0 0 0 syz-executor ufs_lookup() at ufs_lookup+0x613 sys/ufs/ufs/ufs_lookup.c:279 VOP_LOOKUP(fffffb807ada0458,ffff80002f0b1c28,ffff80002f0b1c58) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002f0b1bf8) at vfs_lookup+0x94a sys/kern/vfs_lookup.c:580 namei(ffff80002f0b1bf8) at namei+0x7c3 sys/kern/vfs_lookup.c:250 sys_chdir(ffff80002a7674d0,ffff80002f0b1dc0,ffff80002f0b1d10) at sys_chdir+0x88 change_dir sys/kern/vfs_syscalls.c:838 [inline] sys_chdir(ffff80002a7674d0,ffff80002f0b1dc0,ffff80002f0b1d10) at sys_chdir+0x88 sys/kern/vfs_syscalls.c:784 syscall(ffff80002f0b1dc0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002f0b1dc0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d9c5d6a7cb0, 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(0xffffffff83a35678, 0xffff800028f72004, 0, 1) -> d ddb> trace ufs_lookup() at ufs_lookup+0x613 sys/ufs/ufs/ufs_lookup.c:279 VOP_LOOKUP(fffffb807ada0458,ffff80002f0b1c28,ffff80002f0b1c58) at VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 vfs_lookup(ffff80002f0b1bf8) at vfs_lookup+0x94a sys/kern/vfs_lookup.c:580 namei(ffff80002f0b1bf8) at namei+0x7c3 sys/kern/vfs_lookup.c:250 sys_chdir(ffff80002a7674d0,ffff80002f0b1dc0,ffff80002f0b1d10) at sys_chdir+0x88 change_dir sys/kern/vfs_syscalls.c:838 [inline] sys_chdir(ffff80002a7674d0,ffff80002f0b1dc0,ffff80002f0b1d10) at sys_chdir+0x88 sys/kern/vfs_syscalls.c:784 syscall(ffff80002f0b1dc0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline] syscall(ffff80002f0b1dc0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d9c5d6a7cb0, count: -7 ddb> show registers rdi 0 rsi 0x2 rbp 0xffff80002f0b1a30 rbx 0 rdx 0 rcx 0xffffffff rax 0xffff80002a7674d0 r8 0xffffffffffffffff r9 0xfffffb8007ffd8f0 r10 0x8ff80129cf9e7d52 r11 0xe90dafa47d404fa4 r12 0xfffffb806ce8eee8 r13 0 r14 0 r15 0xffff800028f72000 rip 0xffffffff81a3d143 ufs_lookup+0x613 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002f0b1940 ss 0x10 ufs_lookup+0x613: movzwl 0x4(%r15,%r14,1),%ebx ddb> show proc PROC (syz-executor) tid=220384 pid=69824 tcnt=1 stat=onproc flags process=0 proc=0 runpri=50, usrpri=50, slppri=16, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80002a75a7e0,0xffffffff83a21000 process=0xffff80002a745b08 user=0xffff80002f0ac000, vmspace=0xfffffb806cfcf460 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND *69824 220384 75004 0 7 0 syz-executor 79597 228374 46906 0 2 0 syz-executor 79597 81326 46906 0 3 0x4000080 fsleep syz-executor 38917 489172 37335 0 2 0 syz-executor 38917 276151 37335 0 3 0x4000080 fifow syz-executor 90787 468030 31352 0 2 0 syz-executor 90787 360528 31352 0 3 0x4000080 fsleep syz-executor 92920 115604 45321 0 2 0 syz-executor 92920 192765 45321 0 3 0x4000080 fsleep syz-executor 61792 276015 65936 0 3 0x80 nanoslp syz-executor 61792 144905 65936 0 3 0x4000080 ttyin syz-executor 61792 189266 65936 0 3 0x4000080 fsleep syz-executor 63230 177221 3698 0 3 0x80 nanoslp syz-executor 63230 128886 3698 0 3 0x4000080 kqsel syz-executor 63230 53297 3698 0 3 0x4000080 ttyout syz-executor 63230 454545 3698 0 3 0x4000080 fsleep syz-executor 1100 342956 67039 0 3 0x80 nanoslp syz-executor 1100 261364 67039 0 2 0x4000000 syz-executor 1100 392680 67039 0 3 0x4000080 fsleep syz-executor 75004 40919 14410 0 3 0x82 nanoslp syz-executor 3698 519042 14410 0 3 0x82 nanoslp syz-executor 67840 338526 1 0 3 0x80 nanoslp init 21887 370892 0 0 3 0x14280 nfsidl nfsio 21847 191053 0 0 3 0x14280 nfsidl nfsio 85897 448015 0 0 3 0x14280 nfsidl nfsio 52950 69183 0 0 3 0x14280 nfsidl nfsio 79878 423287 0 0 3 0x14280 nfsidl nfsio 93296 113015 0 0 3 0x14280 nfsidl nfsio 89940 97848 0 0 3 0x14280 nfsidl nfsio 57468 499261 0 0 3 0x14280 nfsidl nfsio 60319 399477 0 0 3 0x14280 nfsidl nfsio 19267 470529 0 0 3 0x14280 nfsidl nfsio 69449 248528 0 0 3 0x14280 nfsidl nfsio 61836 216356 0 0 3 0x14280 nfsidl nfsio 68697 445497 0 0 3 0x14280 nfsidl nfsio 28319 516775 0 0 3 0x14280 nfsidl nfsio 70161 353001 0 0 3 0x14280 nfsidl nfsio 62645 94195 0 0 3 0x14280 nfsidl nfsio 8539 279100 0 0 3 0x14280 nfsidl nfsio 72614 477763 0 0 3 0x14280 nfsidl nfsio 78302 381499 0 0 3 0x14280 nfsidl nfsio 54389 515011 0 0 3 0x14280 nfsidl nfsio 46906 359801 14410 0 3 0x82 nanoslp syz-executor 31352 374134 14410 0 3 0x82 nanoslp syz-executor 65936 47172 14410 0 3 0x82 nanoslp syz-executor 45321 25996 14410 0 3 0x82 nanoslp syz-executor 67039 306510 14410 0 3 0x82 nanoslp syz-executor 37335 182234 14410 0 3 0x82 nanoslp syz-executor 14410 67866 1 0 2 0x2 syz-executor 52825 378979 0 0 3 0x14200 bored smr 71384 2814 0 0 2 0x14200 zerothread 16648 413606 0 0 3 0x14200 aiodoned aiodoned 77187 167048 0 0 3 0x14200 syncer update 87255 142975 0 0 3 0x14200 cleaner cleaner 49309 449392 0 0 3 0x14200 reaper reaper 11949 374354 0 0 3 0x14200 pgdaemon pagedaemon 78032 80949 0 0 3 0x14200 bored viomb 75193 31334 0 0 3 0x40014200 acpi0 acpi0 70888 366528 0 0 2 0x14200 softnet0 49803 523264 0 0 3 0x14200 bored systqmp 99760 331906 0 0 3 0x14200 bored systq 18908 7270 0 0 3 0x40014200 tmoslp softclock 62692 309542 0 0 3 0x40014200 idle0 1 126256 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 11060 12173K 12491K 166960K 13344 0 pcb 18 17K 22K 166960K 543 0 rtable 207 9K 9K 166960K 570 0 pf 30 12K 15K 166960K 89 0 ifaddr 37 6K 8K 166960K 91 0 ifgroup 50 2K 2K 166960K 128 0 sysctl 4 1K 9K 166960K 10 0 counters 33 17K 18K 166960K 78 0 ioctlops 0 0K 4K 166960K 458 0 iov 0 0K 12K 166960K 100 0 mount 1 1K 1K 166960K 1 0 log 4 0K 0K 166960K 8 0 vnodes 1349 85K 86K 166960K 2202 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 25 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 331 0 dirhash 12 2K 2K 166960K 27 0 ACPI 1734 201K 291K 166960K 11964 0 file desc 17 65K 97K 166960K 1134 0 sigio 0 0K 0K 166960K 9 0 proc 11 17K 124K 166960K 696 0 subproc 72 4K 4K 166960K 90 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 3 0K 0K 166960K 145 0 in_multi 79 5K 7K 166960K 158 0 ether_multi 1 0K 0K 166960K 4 0 mrt 2 0K 0K 166960K 51 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 235 1049K 1049K 166960K 235 0 exec 0 0K 1K 166960K 587 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 131 78K 165K 166960K 11454 0 UVM aobj 12 2K 2K 166960K 12 0 pinsyscall 19 38K 96K 166960K 2302 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 96 0 NDP 11 0K 2K 166960K 60 0 temp 59 9116K 9184K 166960K 45404 0 kqueue 3 6K 36K 166960K 207 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 120 186 0 186 4 2 2 3 0 8 2 rtentry 136 182 0 102 4 0 4 4 0 8 0 unpcb 144 1090 0 1088 8 3 5 5 0 8 4 syncache 336 12 0 12 2 1 1 1 0 8 1 tcpcb 736 451 0 449 13 6 7 7 0 8 6 arp 96 27 0 12 1 0 1 1 0 8 0 ipq 40 8 0 0 1 0 1 1 0 8 0 ipqe 40 8 0 0 1 0 1 1 0 8 0 inpcb 328 1510 0 1503 23 14 9 16 0 8 8 ip6q 72 5 0 3 1 0 1 1 0 8 0 ip6af 40 9 0 7 1 0 1 1 0 8 0 nd6 112 36 0 19 1 0 1 1 0 8 0 pkpcb 40 7 0 7 2 1 1 1 0 8 1 kcovpl 48 10 0 2 1 0 1 1 0 8 0 ppxss 1072 35 0 35 2 1 1 1 0 8 1 pppxif 1416 5 0 5 2 1 1 1 0 8 1 pfrule 1360 1 0 1 1 1 0 1 0 8 0 rttmr 136 15 0 15 2 1 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 776 0 396 31 3 28 31 0 8 2 art_table 40 778 0 396 5 0 5 5 0 8 0 art_node 32 180 0 108 1 0 1 1 0 8 0 sysvmsgpl 40 15 0 7 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 72 324 0 314 1 0 1 1 0 8 0 shmpl 112 9 0 0 1 0 1 1 0 8 0 dirhash 1024 27 0 10 3 0 3 3 0 8 0 dino2pl 256 3493 0 2037 92 0 92 92 0 8 0 ffsino 256 3493 0 2037 92 0 92 92 0 8 0 nchpl 144 5043 0 3341 64 0 64 64 0 8 0 rtmask 32 5 0 5 2 1 1 1 0 8 1 vnodes 216 3891 0 0 217 0 217 217 0 8 0 namei 1024 16694 0 16693 4 2 2 2 0 8 1 kstatmem 264 75 0 52 2 0 2 2 0 8 0 scsiplug 72 8 0 8 2 1 1 1 0 8 1 scxspl 216 18114 0 18114 10 2 8 8 1 8 8 plimitpl 152 192 0 179 1 0 1 1 0 8 0 sigapl 424 1450 0 1397 8 0 8 8 0 8 0 knotepl 120 72370 0 72142 17 8 9 11 0 8 2 kqueuepl 184 385 0 381 7 3 4 4 0 8 3 pipepl 304 253 0 226 8 0 8 8 0 8 4 fdescpl 448 1417 0 1397 5 1 4 5 0 8 1 filepl 120 9465 0 9293 21 9 12 17 0 8 4 lockfpl 104 442 0 442 1 0 1 1 0 8 1 lockfspl 48 160 0 160 1 0 1 1 0 8 1 sessionpl 144 65 0 63 1 0 1 1 0 8 0 pgrppl 48 86 0 76 1 0 1 1 0 8 0 ucredpl 104 1785 0 1782 1 0 1 1 0 8 0 zombiepl 144 1397 0 1397 2 1 1 1 0 8 1 processpl 1152 1450 0 1397 5 0 5 5 0 8 0 procpl 664 2856 0 2792 7 0 7 7 0 8 0 sosppl 176 1 0 1 1 1 0 1 0 8 0 sockpl 552 2855 0 2846 23 14 9 15 0 8 8 mcl64k 65536 69 0 68 1 0 1 1 0 8 0 mcl16k 16384 23 0 23 2 1 1 1 0 8 1 mcl12k 12288 5 0 5 2 1 1 1 0 8 1 mcl9k128 9344 2 0 2 1 1 0 1 0 8 0 mcl8k 8192 20 0 20 2 1 1 1 0 8 1 mcl4k 4096 4035 0 3983 15 6 9 14 0 8 1 mcl2k2 2112 2 0 2 1 0 1 1 0 8 1 mcl2k 2048 943 0 942 6 0 6 6 0 8 5 mextrefs 64 607 0 607 1 0 1 1 0 8 1 mtagpl 96 15 0 14 2 1 1 1 0 8 0 mbufpl 256 15075 0 14894 33 9 24 26 0 8 8 bufpl 272 6729 0 513 415 0 415 415 0 8 0 anonpl 24 182849 0 181248 65 20 45 45 0 187 18 amapchunkpl 152 38336 0 37976 34 8 26 28 0 158 9 amappl16 200 2576 0 2548 28 18 10 15 0 8 7 amappl15 192 5 0 5 1 1 0 1 0 8 0 amappl14 184 442 0 442 1 0 1 1 0 8 1 amappl13 176 133 0 133 1 0 1 1 0 8 1 amappl12 168 1662 0 1645 2 0 2 2 0 8 0 amappl11 160 2 0 2 1 1 0 1 0 8 0 amappl10 152 56 0 56 1 0 1 1 0 8 1 amappl9 144 280 0 280 1 0 1 1 0 8 1 amappl8 136 104 0 103 1 0 1 1 0 8 0 amappl7 128 161 0 158 1 0 1 1 0 8 0 amappl6 120 167 0 166 1 0 1 1 0 8 0 amappl5 112 92 0 90 1 0 1 1 0 8 0 amappl4 104 274 0 271 1 0 1 1 0 8 0 amappl3 96 7858 0 7779 4 0 4 4 0 8 0 amappl2 88 555 0 545 2 0 2 2 0 8 0 amappl1 80 14310 0 14215 13 1 12 13 0 8 7 amappl 88 10518 0 10397 5 0 5 5 0 92 1 uvmvnodes 80 119 0 0 3 0 3 3 0 8 0 dma32768 32768 1 0 1 1 1 0 1 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 7 0 7 2 1 1 1 0 8 1 dma128 128 259 0 259 2 1 1 1 0 8 1 dma64 64 9 0 9 2 1 1 1 0 8 1 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 11 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1417 0 1397 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1417 0 1397 1 0 1 1 0 8 0 vmmpekpl 168 12143 0 12097 3 0 3 3 0 8 0 vmmpepl 168 93257 0 92390 102 10 92 92 0 357 50 vmsppl 368 1416 0 1397 4 1 3 4 0 8 0 rwobjpl 40 24843 0 24421 15 2 13 13 0 8 1 pdppl 4096 2840