uvm_fault(0xffffffff82bcbd30, 0xffff80001ebef004, 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 *130375 16151 0 0 0 0 syz-executor.1 ufs_lookup() at ufs_lookup+0x4ce sys/ufs/ufs/ufs_lookup.c:281 VOP_LOOKUP(fffffd8071fa2618,ffff800027fd2688,ffff800027fd26b8) at VOP_LOOKUP+0x58 sys/kern/vfs_vops.c:85 vfs_lookup(ffff800027fd2658) at vfs_lookup+0x6cc sys/kern/vfs_lookup.c:566 namei(ffff800027fd2658) at namei+0x55a sys/kern/vfs_lookup.c:250 sys_chdir(ffff800026589088,ffff800027fd2760,ffff800027fd27b0) at sys_chdir+0x72 change_dir sys/kern/vfs_syscalls.c:843 [inline] sys_chdir(ffff800026589088,ffff800027fd2760,ffff800027fd27b0) at sys_chdir+0x72 sys/kern/vfs_syscalls.c:789 syscall(ffff800027fd2830) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffbcbf0, 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, 0xffff80001ebef004, 0, 1) -> d ddb> trace ufs_lookup() at ufs_lookup+0x4ce sys/ufs/ufs/ufs_lookup.c:281 VOP_LOOKUP(fffffd8071fa2618,ffff800027fd2688,ffff800027fd26b8) at VOP_LOOKUP+0x58 sys/kern/vfs_vops.c:85 vfs_lookup(ffff800027fd2658) at vfs_lookup+0x6cc sys/kern/vfs_lookup.c:566 namei(ffff800027fd2658) at namei+0x55a sys/kern/vfs_lookup.c:250 sys_chdir(ffff800026589088,ffff800027fd2760,ffff800027fd27b0) at sys_chdir+0x72 change_dir sys/kern/vfs_syscalls.c:843 [inline] sys_chdir(ffff800026589088,ffff800027fd2760,ffff800027fd27b0) at sys_chdir+0x72 sys/kern/vfs_syscalls.c:789 syscall(ffff800027fd2830) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffbcbf0, count: -7 ddb> show registers rdi 0 rsi 0 rbp 0xffff800027fd2490 rbx 0 rdx 0 rcx 0xffffffff rax 0xfffffd8063ee04c0 r8 0xffffffffffffffff r9 0xfffffd807f7d7410 r10 0x25db58ca0554728c r11 0xc135bdb9d4aee8a8 r12 0 r13 0 r14 0 r15 0xffff80001ebef000 rip 0xffffffff81260e4e ufs_lookup+0x4ce cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff800027fd2390 ss 0x10 ufs_lookup+0x4ce: movzwl 0x4(%r15,%r13,1),%ebx ddb> show proc PROC (syz-executor.1) pid=130375 stat=onproc flags process=0 proc=0 pri=84, usrpri=84, nice=20 forw=0xffffffffffffffff, list=0xffff800026588860,0xffff800026589350 process=0xffff8000ffff6be0 user=0xffff800027fcd000, vmspace=0xfffffd8069b71820 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 97308 110023 65242 0 2 0 syz-executor.6 97308 117898 65242 0 3 0x4000080 kqpoll syz-executor.6 97308 425137 65242 0 3 0x4000080 kqpoll syz-executor.6 19341 420166 12194 0 2 0 syz-executor.0 19341 296023 12194 0 3 0x4000080 fsleep syz-executor.0 19341 16086 12194 0 3 0x4000080 fsleep syz-executor.0 *16151 130375 29527 0 7 0 syz-executor.1 79585 262581 79374 0 2 0 syz-executor.7 77568 44764 40177 0 2 0 syz-executor.5 77568 379837 40177 0 3 0x4000080 fsleep syz-executor.5 35060 304988 12618 0 2 0 syz-executor.4 35060 331554 12618 0 2 0x4000000 syz-executor.4 58134 406537 713 0 2 0x480 syz-executor.2 58134 463912 713 0 3 0x4000080 netio syz-executor.2 58134 203260 713 0 3 0x4000080 fsleep syz-executor.2 12618 226331 78594 0 2 0x482 syz-executor.4 40177 243620 78594 0 2 0x482 syz-executor.5 65242 147860 78594 0 2 0x482 syz-executor.6 29527 194434 78594 0 2 0x2 syz-executor.1 85653 389198 78594 0 2 0x2 syz-executor.3 21038 250477 0 0 3 0x14200 acct acct 30050 215454 1 0 3 0x100083 ttyin getty 12194 286021 78594 0 2 0x482 syz-executor.0 79374 129067 78594 0 2 0x482 syz-executor.7 713 309133 78594 0 2 0x482 syz-executor.2 87481 408646 0 0 3 0x14200 bored sosplice 78594 336652 89919 0 3 0x82 wait syz-fuzzer 78594 296604 89919 0 3 0x4000082 nanoslp syz-fuzzer 78594 416768 89919 0 3 0x4000082 wait syz-fuzzer 78594 84493 89919 0 3 0x4000082 wait syz-fuzzer 78594 276046 89919 0 3 0x4000082 thrsleep syz-fuzzer 78594 115016 89919 0 3 0x4000082 wait syz-fuzzer 78594 209505 89919 0 3 0x4000082 wait syz-fuzzer 78594 384725 89919 0 3 0x4000082 wait syz-fuzzer 78594 385829 89919 0 3 0x4000082 thrsleep syz-fuzzer 78594 90944 89919 0 3 0x4000082 wait syz-fuzzer 78594 186477 89919 0 3 0x4000082 thrsleep syz-fuzzer 78594 339859 89919 0 3 0x4000082 wait syz-fuzzer 78594 387994 89919 0 3 0x4000082 thrsleep syz-fuzzer 78594 67599 89919 0 3 0x4000082 kqread syz-fuzzer 89919 494790 14290 0 3 0x10008a sigsusp ksh 14290 350660 91751 0 3 0x9a kqread sshd 91751 458390 1 0 3 0x88 kqread sshd 1984 23254 44591 73 3 0x1100090 kqread syslogd 44591 157658 1 0 3 0x100082 netio syslogd 8222 488904 1 0 3 0x100080 kqread resolvd 51876 142687 42479 77 3 0x100092 kqread dhcpleased 96257 222514 42479 77 3 0x100092 kqread dhcpleased 42479 232711 1 0 3 0x80 kqread dhcpleased 18298 306874 0 0 3 0x14200 bored smr 5298 4288 0 0 2 0x14200 zerothread 1494 328731 0 0 3 0x14200 aiodoned aiodoned 22229 407389 0 0 3 0x14200 syncer update 46741 447020 0 0 3 0x14200 cleaner cleaner 31459 163310 0 0 3 0x14200 reaper reaper 61703 522985 0 0 3 0x14200 pgdaemon pagedaemon 82507 164015 0 0 3 0x14200 bored viomb 31843 113844 0 0 3 0x40014200 acpi0 acpi0 56502 179474 0 0 3 0x14200 bored softnet 23158 253908 0 0 3 0x14200 bored softnet 80688 359544 0 0 3 0x14200 bored softnet 49832 364838 0 0 3 0x14200 bored softnet 34794 470839 0 0 3 0x14200 bored systqmp 58982 425997 0 0 3 0x14200 bored systq 53089 204504 0 0 3 0x40014200 bored softclock 63223 512632 0 0 3 0x40014200 idle0 1 163040 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 10232 6441K 6879K 78643K 19733 0 pcb 15 22K 24K 78643K 1911 0 rtable 172 14K 16K 78643K 1942 0 ifaddr 90 26K 27K 78643K 678 0 sysctl 2 0K 0K 78643K 2 0 counters 27 17K 17K 78643K 231 0 ioctlops 0 0K 4K 78643K 488 0 iov 0 0K 44K 78643K 1108 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1398 87K 88K 78643K 5027 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 63 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 921 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 17 61K 83K 78643K 5635 0 sigio 0 0K 0K 78643K 132 0 proc 60 59K 83K 78643K 1409 0 subproc 104 6K 6K 78643K 416 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 5 0K 0K 78643K 444 0 in_multi 79 5K 6K 78643K 598 0 ether_multi 4 0K 0K 78643K 48 0 mrt 1 0K 0K 78643K 50 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 223 996K 996K 78643K 223 0 exec 0 0K 1K 78643K 1488 0 pfkey data 0 0K 0K 78643K 3 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 316 88K 100K 78643K 37504 0 UVM aobj 131 4K 4K 78643K 134 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 2 0K 0K 78643K 336 0 NDP 13 0K 1K 78643K 215 0 temp 132 5770K 7814K 78643K 122404 0 kqueue 12 18K 26K 78643K 455 0 SYN cache 2 2352K 2360K 78643K 3 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 719 0 716 13 12 1 3 0 8 0 rtentry 112 535 0 464 4 1 3 4 0 8 0 unpcb 144 6804 0 6787 75 73 2 10 0 8 1 syncache 296 56 0 56 17 17 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 129 46 129 5 5 0 1 0 8 0 tcpcb 776 8177 0 8169 144 139 5 15 0 8 3 arp 88 71 0 60 1 0 1 1 0 8 0 ipq 40 4 0 4 1 1 0 1 0 8 0 ipqe 40 8 0 8 1 1 0 1 0 8 0 inpcb 336 19233 0 19216 221 213 8 21 0 8 6 nd6 48 110 0 96 1 0 1 1 0 8 0 pkpcb 40 14 0 14 5 5 0 1 0 8 0 kcovpl 48 32 0 24 1 0 1 1 0 8 0 mppekey 1024 4 0 4 2 2 0 1 0 8 0 ppxss 1160 121 0 121 15 14 1 1 0 8 1 pppxif 1360 67 0 67 9 9 0 1 0 8 0 pfstscr 40 32 0 16 3 2 1 1 0 8 0 pfanchor 1280 7 0 6 1 0 1 1 0 8 0 pftag 88 1 0 0 1 0 1 1 0 8 0 pfqueue 264 10 0 10 3 3 0 1 0 8 0 pfstitem 24 26 0 0 1 0 1 1 0 8 0 pfstkey 128 64 0 53 3 2 1 1 0 8 0 pfstate 352 35 0 22 4 2 2 2 0 8 0 rttmr 136 13 0 13 4 4 0 1 0 8 0 art_heap8 4096 10 0 9 8 7 1 3 0 8 0 art_heap4 256 2680 0 2306 51 26 25 30 0 8 0 art_table 32 2690 0 2315 4 0 4 4 0 8 0 art_node 16 527 0 465 1 0 1 1 0 8 0 semapl 112 915 0 905 1 0 1 1 0 8 0 shmpl 112 131 0 3 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 8636 0 7178 92 0 92 92 0 8 0 ffsino 240 8636 0 7178 86 0 86 86 0 8 0 nchpl 144 16507 0 14862 63 1 62 63 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 61893 0 61892 9 8 1 3 0 8 0 vmpool 664 27 0 27 7 7 0 1 0 8 0 kstatmem 264 284 0 258 5 3 2 3 0 8 0 scsiplug 72 6 0 6 2 2 0 1 0 8 0 scxspl 216 55706 0 55706 25 24 1 8 0 8 1 plimitpl 152 703 0 688 1 0 1 1 0 8 0 sigapl 424 5903 0 5857 8 2 6 8 0 8 0 futexpl 64 72126 0 72122 6 5 1 1 0 8 0 knotepl 120 85528 0 85447 74 67 7 11 0 8 3 kqueuepl 184 1085 0 1075 16 15 1 4 0 8 0 pipepl 288 1665 0 1637 38 31 7 9 0 8 4 fdescpl 432 5864 0 5836 7 3 4 4 0 8 0 filepl 120 56358 0 56110 110 96 14 19 0 8 4 lockfpl 104 2035 0 2033 7 6 1 2 0 8 0 lockfspl 48 658 0 656 1 0 1 1 0 8 0 sessionpl 144 51 0 35 1 0 1 1 0 8 0 pgrppl 48 130 0 114 1 0 1 1 0 8 0 ucredpl 104 4077 0 4066 1 0 1 1 0 8 0 zombiepl 144 5857 0 5857 3 2 1 1 0 8 1 processpl 1008 5903 0 5857 10 4 6 9 0 8 0 procpl 696 14366 0 14299 15 7 8 10 0 8 0 sosppl 168 59 0 58 6 5 1 1 0 8 0 sockpl 456 26784 0 26747 667 655 12 42 0 8 7 mcl64k 65536 291 0 291 20 19 1 1 0 8 1 mcl16k 16384 142 0 142 20 19 1 1 0 8 1 mcl12k 12288 227 0 227 21 20 1 1 0 8 1 mcl9k 9216 157 0 157 24 23 1 1 0 8 1 mcl8k 8192 617 0 617 21 20 1 1 0 8 1 mcl4k 4096 760 0 760 10 9 1 1 0 8 1 mcl2k2 2112 56 0 56 20 19 1 1 0 8 1 mcl2k 2048 91462 0 91391 52 41 11 39 0 8 1 mtagpl 96 949 0 904 10 7 3 7 0 8 0 mbufpl 256 217923 0 217685 449 427 22 118 0 8 0 bufpl 288 14132 0 7732 458 0 458 458 0 8 0 anonpl 24 1138220 0 1121148 199 79 120 186 0 188 0 amapchunkpl 152 110968 0 110242 101 70 31 59 0 158 0 amappl16 200 9615 0 8959 53 17 36 43 0 8 0 amappl15 192 9 0 9 2 2 0 1 0 8 0 amappl14 184 250 0 236 2 1 1 2 0 8 0 amappl13 176 3 0 3 1 1 0 1 0 8 0 amappl12 168 685 0 682 1 0 1 1 0 8 0 amappl11 160 41 0 31 1 0 1 1 0 8 0 amappl10 152 89 0 77 1 0 1 1 0 8 0 amappl9 144 1000 0 999 1 0 1 1 0 8 0 amappl8 136 277 0 212 3 0 3 3 0 8 0 amappl7 128 219 0 193 2 0 2 2 0 8 0 amappl6 120 292 0 277 2 1 1 2 0 8 0 amappl5 112 300 0 294 1 0 1 1 0 8 0 amappl4 104 821 0 796 2 0 2 2 0 8 0 amappl3 96 16454 0 16399 2 0 2 2 0 8 0 amappl2 88 6629 0 6552 3 1 2 3 0 8 0 amappl1 80 133472 0 132751 28 11 17 26 0 8 0 amappl 88 36616 0 36433 5 0 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 72 133 0 3 3 0 3 3 0 8 0 uaddrrnd 24 5891 0 5863 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5891 0 5863 1 0 1 1 0 8 0 vmmpekpl 168 48086 0 48039 3 0 3 3 0 8 0 vmmpepl 168 543790 0 540931 290 149 141 151 0 357 8 vmsppl 344 5890 0 5863 3 0 3 3 0 8 0 rwobjpl 24 143687 0 135855 50 2 48 49 0 8 0 pdppl 4096 11788 0 11726 468 404 64 72 0 8 2 pvpl 32 2329719 0 2307196 399 194 205 333 0 265 0 pmappl 216 5890 0 5863 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 2020 0 1237 26 1 25 26 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(fffffd8071fa2618,ffff800027fd2688,ffff800027fd26b8) at VOP_LOOKUP+0x58 sys/kern/vfs_vops.c:85 vfs_lookup(ffff800027fd2658) at vfs_lookup+0x6cc sys/kern/vfs_lookup.c:566 namei(ffff800027fd2658) at namei+0x55a sys/kern/vfs_lookup.c:250 sys_chdir(ffff800026589088,ffff800027fd2760,ffff800027fd27b0) at sys_chdir+0x72 change_dir sys/kern/vfs_syscalls.c:843 [inline] sys_chdir(ffff800026589088,ffff800027fd2760,ffff800027fd27b0) at sys_chdir+0x72 sys/kern/vfs_syscalls.c:789 syscall(ffff800027fd2830) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffbcbf0, 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(fffffd8071fa2618,ffff800027fd2688,ffff800027fd26b8) at VOP_LOOKUP+0x58 sys/kern/vfs_vops.c:85 vfs_lookup(ffff800027fd2658) at vfs_lookup+0x6cc sys/kern/vfs_lookup.c:566 namei(ffff800027fd2658) at namei+0x55a sys/kern/vfs_lookup.c:250 sys_chdir(ffff800026589088,ffff800027fd2760,ffff800027fd27b0) at sys_chdir+0x72 change_dir sys/kern/vfs_syscalls.c:843 [inline] sys_chdir(ffff800026589088,ffff800027fd2760,ffff800027fd27b0) at sys_chdir+0x72 sys/kern/vfs_syscalls.c:789 syscall(ffff800027fd2830) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffbcbf0, count: -7