uvm_fault(0xffffffff82bcbd30, 0xffff80001ffff000, 0, 1) -> d kernel: page fault trap, code=0 Stopped at ffs2_balloc+0x7ae: movq 0(%rcx,%rax,8),%r15 TID PID UID PRFLAGS PFLAGS CPU COMMAND *149430 65676 0 0 0x4000000 0 syz-executor.6 ffs2_balloc(fffffd806e3c3b50,30000,4000,fffffd807f7d77b8,0,ffff80002cca1e28) at ffs2_balloc+0x7ae sys/ufs/ffs/ffs_balloc.c:660 ffs_write(ffff80002cca1ec0) at ffs_write+0x411 sys/ufs/ffs/ffs_vnops.c:346 VOP_WRITE(fffffd8067c9eeb8,ffff80002cca20e0,1,fffffd807f7d77b8) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd80759e2d98,ffff80002cca20e0,0) at vn_write+0x152 sys/kern/vfs_vnops.c:408 dofilewritev(ffff80002b412868,5,ffff80002cca20e0,0,ffff80002cca21d0) at dofilewritev+0x19c sys/kern/sys_generic.c:375 sys_writev(ffff80002b412868,ffff80002cca2188,ffff80002cca21d0) at sys_writev+0xa7 sys/kern/sys_generic.c:322 syscall(ffff80002cca2250) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9b6786edbd0, count: 7 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, 0xffff80001ffff000, 0, 1) -> d ddb> trace ffs2_balloc(fffffd806e3c3b50,30000,4000,fffffd807f7d77b8,0,ffff80002cca1e28) at ffs2_balloc+0x7ae sys/ufs/ffs/ffs_balloc.c:660 ffs_write(ffff80002cca1ec0) at ffs_write+0x411 sys/ufs/ffs/ffs_vnops.c:346 VOP_WRITE(fffffd8067c9eeb8,ffff80002cca20e0,1,fffffd807f7d77b8) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd80759e2d98,ffff80002cca20e0,0) at vn_write+0x152 sys/kern/vfs_vnops.c:408 dofilewritev(ffff80002b412868,5,ffff80002cca20e0,0,ffff80002cca21d0) at dofilewritev+0x19c sys/kern/sys_generic.c:375 sys_writev(ffff80002b412868,ffff80002cca2188,ffff80002cca21d0) at sys_writev+0xa7 sys/kern/sys_generic.c:322 syscall(ffff80002cca2250) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9b6786edbd0, count: -8 ddb> show registers rdi 0 rsi 0 rbp 0xffff80002cca1de0 rbx 0 rdx 0xffff800000d3db80 rcx 0xffff80001ffff000 rax 0 r8 0xffffffffffffffff r9 0 r10 0xb60e3bc03842a537 r11 0xf5569f1cf231cf78 r12 0x10 r13 0xfffffd807455a018 r14 0 r15 0 rip 0xffffffff812ec34e ffs2_balloc+0x7ae cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff80002cca1c50 ss 0x10 ffs2_balloc+0x7ae: movq 0(%rcx,%rax,8),%r15 ddb> show proc PROC (syz-executor.6) pid=149430 stat=onproc flags process=0 proc=4000000 pri=84, usrpri=84, nice=20 forw=0xffffffffffffffff, list=0xffff80002b413600,0xffff80002b413b80 process=0xffff8000fffecfc0 user=0xffff80002cc9d000, vmspace=0xfffffd8069b62978 estcpu=34, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 9948 424909 61535 0 2 0 syz-executor.7 9948 27852 61535 0 2 0x4000000 syz-executor.7 65676 86673 21943 0 2 0 syz-executor.6 *65676 149430 21943 0 7 0x4000000 syz-executor.6 2646 514846 34310 0 2 0 syz-executor.4 2646 304211 34310 0 3 0x4000080 fsleep syz-executor.4 1076 350742 62945 0 3 0x80 nanoslp syz-executor.5 1076 516017 62945 0 3 0x4000080 kqread syz-executor.5 24879 448597 8900 0 2 0 syz-executor.1 24879 464256 8900 0 2 0x4000000 syz-executor.1 41944 270858 99105 0 2 0x480 syz-executor.0 41944 308289 99105 0 3 0x4000080 fsleep syz-executor.0 41944 290906 99105 0 2 0x4000000 syz-executor.0 41944 452183 99105 0 3 0x4000080 fsleep syz-executor.0 38265 303856 80735 0 3 0x1000080 nanoslp syz-executor.2 38265 192157 80735 0 3 0x5000080 netio syz-executor.2 38265 228889 80735 0 3 0x5000080 fsleep syz-executor.2 62945 369776 67853 0 3 0x82 nanoslp syz-executor.5 5960 476695 0 0 3 0x14200 acct acct 80735 251109 67853 0 3 0x82 nanoslp syz-executor.2 8900 494158 67853 0 3 0x82 nanoslp syz-executor.1 71923 14621 67853 0 2 0x2 syz-executor.3 99105 396009 67853 0 3 0x82 nanoslp syz-executor.0 52809 160470 0 0 3 0x14280 nfsidl nfsio 43716 47809 0 0 3 0x14280 nfsidl nfsio 49406 381420 0 0 3 0x14280 nfsidl nfsio 93129 246205 0 0 3 0x14280 nfsidl nfsio 8108 57303 0 0 3 0x14280 nfsidl nfsio 8871 11797 0 0 3 0x14280 nfsidl nfsio 67225 334583 0 0 3 0x14280 nfsidl nfsio 77710 51357 0 0 3 0x14280 nfsidl nfsio 67460 470550 0 0 3 0x14280 nfsidl nfsio 364 153245 0 0 3 0x14280 nfsidl nfsio 4711 518719 0 0 3 0x14280 nfsidl nfsio 26558 94100 0 0 3 0x14280 nfsidl nfsio 4693 514564 0 0 3 0x14280 nfsidl nfsio 61736 244449 0 0 3 0x14280 nfsidl nfsio 4593 345856 0 0 3 0x14280 nfsidl nfsio 3372 37552 0 0 3 0x14280 nfsidl nfsio 61167 203086 0 0 3 0x14280 nfsidl nfsio 99334 159587 0 0 3 0x14280 nfsidl nfsio 36339 500743 0 0 3 0x14280 nfsidl nfsio 93269 78431 0 0 3 0x14280 nfsidl nfsio 97477 385493 1 0 3 0x100083 ttyin getty 34310 447891 67853 0 3 0x82 nanoslp syz-executor.4 21943 79102 67853 0 3 0x82 nanoslp syz-executor.6 61535 39368 67853 0 3 0x82 nanoslp syz-executor.7 30302 387041 0 0 3 0x14200 bored sosplice 67853 160552 46007 0 3 0x82 wait syz-fuzzer 67853 232073 46007 0 3 0x4000082 nanoslp syz-fuzzer 67853 344025 46007 0 3 0x4000082 wait syz-fuzzer 67853 73230 46007 0 3 0x4000082 wait syz-fuzzer 67853 131764 46007 0 3 0x4000082 wait syz-fuzzer 67853 314931 46007 0 3 0x4000082 thrsleep syz-fuzzer 67853 10804 46007 0 3 0x4000082 thrsleep syz-fuzzer 67853 504842 46007 0 3 0x4000082 thrsleep syz-fuzzer 67853 459059 46007 0 3 0x4000082 wait syz-fuzzer 67853 399194 46007 0 3 0x4000082 thrsleep syz-fuzzer 67853 509745 46007 0 3 0x4000082 kqread syz-fuzzer 67853 23269 46007 0 3 0x4000082 wait syz-fuzzer 67853 25392 46007 0 3 0x4000082 wait syz-fuzzer 67853 137962 46007 0 3 0x4000082 wait syz-fuzzer 46007 145253 80027 0 3 0x10008a sigsusp ksh 80027 227597 40642 0 3 0x9a kqread sshd 40642 411016 1 0 3 0x88 kqread sshd 33236 398820 31570 73 3 0x1100090 kqread syslogd 31570 449215 1 0 3 0x100082 netio syslogd 27263 229760 1 0 3 0x100080 kqread resolvd 98127 507002 65006 77 3 0x100092 kqread dhcpleased 39366 347126 65006 77 3 0x100092 kqread dhcpleased 65006 368298 1 0 3 0x80 kqread dhcpleased 5516 522132 0 0 3 0x14200 bored smr 99905 522394 0 0 2 0x14200 zerothread 5226 216410 0 0 3 0x14200 aiodoned aiodoned 87607 304640 0 0 3 0x14200 syncer update 69776 422486 0 0 3 0x14200 cleaner cleaner 25557 167833 0 0 3 0x14200 reaper reaper 57141 523914 0 0 3 0x14200 pgdaemon pagedaemon 1356 21394 0 0 3 0x14200 bored viomb 63270 37013 0 0 3 0x40014200 acpi0 acpi0 51143 385301 0 0 3 0x14200 bored softnet 96137 36646 0 0 3 0x14200 bored softnet 2676 102570 0 0 3 0x14200 bored softnet 349 119358 0 0 3 0x14200 bored softnet 66310 158714 0 0 3 0x14200 bored systqmp 70063 482313 0 0 3 0x14200 bored systq 44086 39810 0 0 2 0x40014200 softclock 28050 143043 0 0 3 0x40014200 idle0 1 323589 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 10228 6423K 7577K 78643K 22339 0 pcb 13 13K 15K 78643K 624 0 rtable 209 15K 15K 78643K 1077 0 ifaddr 91 24K 24K 78643K 471 0 sysctl 2 0K 0K 78643K 4 0 counters 29 17K 17K 78643K 198 0 ioctlops 0 0K 4K 78643K 710 0 iov 1 0K 24K 78643K 369 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1467 92K 92K 78643K 5427 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 53 0 VM map 2 1K 1K 78643K 2 0 sem 22 5K 10K 78643K 364 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 17 61K 69K 78643K 4162 0 sigio 0 0K 0K 78643K 223 0 proc 60 59K 75K 78643K 1001 0 subproc 104 6K 6K 78643K 312 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 8420 0 in_multi 88 5K 6K 78643K 389 0 ether_multi 1 0K 0K 78643K 25 0 mrt 1 0K 0K 78643K 8 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 229 1023K 1023K 78643K 229 0 exec 0 0K 1K 78643K 1080 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 307 84K 97K 78643K 28259 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 192 0 NDP 16 0K 1K 78643K 145 0 temp 137 5770K 6810K 78643K 58646 0 kqueue 12 18K 26K 78643K 325 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 120 290 0 287 2 1 1 2 0 8 0 rtentry 112 349 0 256 4 0 4 4 0 8 0 unpcb 144 5960 0 5945 77 73 4 11 0 8 3 syncache 296 40 0 40 10 9 1 1 0 8 1 sackhl 24 2 0 2 2 2 0 1 0 8 0 tcpqe 32 157 0 157 10 9 1 1 0 8 1 tcpcb 776 5236 0 5228 94 86 8 15 0 8 6 arp 88 50 0 34 1 0 1 1 0 8 0 ipq 40 2 0 1 1 0 1 1 0 8 0 ipqe 40 9 0 4 1 0 1 1 0 8 0 inpcb 336 7755 0 7743 86 77 9 18 0 8 6 nd6 48 79 0 57 1 0 1 1 0 8 0 pkpcb 40 103 0 103 2 2 0 1 0 8 0 kcovpl 48 24 0 16 1 0 1 1 0 8 0 mppekey 1024 71 0 71 3 2 1 1 0 8 1 ppxss 1160 114 0 114 12 11 1 1 0 8 1 pppxif 1360 90 0 90 9 8 1 1 0 8 1 pfstscr 40 18 0 8 1 0 1 1 0 8 0 pfosfp 40 6 0 4 1 0 1 1 0 8 0 pfosfpen 112 6 0 4 1 0 1 1 0 8 0 pfanchor 1280 839 6 327 45 2 43 43 0 8 0 pfstitem 24 25 0 8 1 0 1 1 0 8 0 pfstkey 128 32 0 23 1 0 1 1 0 8 0 pfstate 352 18 0 8 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1696 0 1283 36 10 26 29 0 8 0 art_table 32 1697 0 1283 5 1 4 4 0 8 0 art_node 16 348 0 267 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 0 1 0 1 1 0 8 0 semapl 112 353 0 333 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 7283 0 5840 91 0 91 91 0 8 0 ffsino 240 7283 0 5840 85 0 85 85 0 8 0 nchpl 144 12827 0 11188 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 47107 0 47106 9 8 1 3 0 8 0 vmpool 664 6 0 6 2 2 0 1 0 8 0 kstatmem 264 186 0 158 2 0 2 2 0 8 0 scsiplug 72 6 0 6 2 2 0 1 0 8 0 scxspl 216 41051 0 41051 16 15 1 8 0 8 1 plimitpl 152 697 0 682 1 0 1 1 0 8 0 sigapl 424 4566 0 4500 8 0 8 8 0 8 0 futexpl 64 48590 0 48586 4 3 1 1 0 8 0 knotepl 120 63924 0 63844 32 27 5 11 0 8 0 kqueuepl 184 977 0 935 19 16 3 4 0 8 0 pipepl 288 1153 0 1125 24 21 3 12 0 8 0 fdescpl 432 4408 0 4380 4 0 4 4 0 8 0 filepl 120 37733 0 37452 88 77 11 18 0 8 2 lockfpl 104 1257 0 1255 2 1 1 2 0 8 0 lockfspl 48 328 0 326 1 0 1 1 0 8 0 sessionpl 144 40 0 24 1 0 1 1 0 8 0 pgrppl 48 180 0 164 1 0 1 1 0 8 0 ucredpl 104 4989 0 4977 1 0 1 1 0 8 0 zombiepl 144 4500 0 4500 4 3 1 1 0 8 1 processpl 1008 4566 0 4500 10 1 9 9 0 8 0 procpl 696 10718 0 10629 13 4 9 10 0 8 0 sosppl 168 55 0 55 13 12 1 1 0 8 1 sockpl 456 14111 0 14081 364 351 13 37 0 8 8 mcl64k 65536 227 0 222 13 12 1 1 0 8 0 mcl16k 16384 67 0 67 15 14 1 1 0 8 1 mcl12k 12288 194 0 194 14 13 1 1 0 8 1 mcl9k 9216 68 0 68 13 13 0 1 0 8 0 mcl8k 8192 224 0 224 12 11 1 1 0 8 1 mcl4k 4096 515 0 515 12 11 1 1 0 8 1 mcl2k2 2112 31 0 31 12 11 1 1 0 8 1 mcl2k 2048 87636 0 87561 46 35 11 38 0 8 0 mtagpl 96 1293 0 1028 16 6 10 14 0 8 0 mbufpl 256 196519 0 196049 422 373 49 122 0 8 0 bufpl 288 11315 0 4921 457 0 457 457 0 8 0 anonpl 24 911193 0 895518 171 37 134 141 0 188 14 amapchunkpl 152 104684 0 103987 77 47 30 50 0 158 0 amappl16 200 9997 0 9320 85 41 44 49 0 8 7 amappl15 192 2 0 2 1 1 0 1 0 8 0 amappl14 184 217 0 205 2 1 1 2 0 8 0 amappl13 176 5 0 4 1 0 1 1 0 8 0 amappl12 168 595 0 594 1 0 1 1 0 8 0 amappl11 160 48 0 38 1 0 1 1 0 8 0 amappl10 152 45 0 36 1 0 1 1 0 8 0 amappl9 144 984 0 980 1 0 1 1 0 8 0 amappl8 136 234 0 172 4 1 3 3 0 8 0 amappl7 128 194 0 170 2 0 2 2 0 8 0 amappl6 120 250 0 238 2 1 1 2 0 8 0 amappl5 112 240 0 234 1 0 1 1 0 8 0 amappl4 104 682 0 653 2 0 2 2 0 8 0 amappl3 96 12128 0 12072 2 0 2 2 0 8 0 amappl2 88 4998 0 4928 3 1 2 3 0 8 0 amappl1 80 100484 0 99739 31 14 17 26 0 8 1 amappl 88 27495 0 27309 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 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 4414 0 4386 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4414 0 4386 1 0 1 1 0 8 0 vmmpekpl 168 37227 0 37164 4 0 4 4 0 8 0 vmmpepl 168 411400 0 408497 314 173 141 166 0 357 10 vmsppl 344 4413 0 4386 3 0 3 3 0 8 0 rwobjpl 24 112466 0 104608 50 1 49 49 0 8 1 pdppl 4096 8834 0 8772 351 287 64 66 0 8 2 pvpl 32 1871797 0 1850241 464 232 232 336 0 265 29 pmappl 216 4413 0 4386 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 1678 0 871 25 0 25 25 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace ffs2_balloc(fffffd806e3c3b50,30000,4000,fffffd807f7d77b8,0,ffff80002cca1e28) at ffs2_balloc+0x7ae sys/ufs/ffs/ffs_balloc.c:660 ffs_write(ffff80002cca1ec0) at ffs_write+0x411 sys/ufs/ffs/ffs_vnops.c:346 VOP_WRITE(fffffd8067c9eeb8,ffff80002cca20e0,1,fffffd807f7d77b8) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd80759e2d98,ffff80002cca20e0,0) at vn_write+0x152 sys/kern/vfs_vnops.c:408 dofilewritev(ffff80002b412868,5,ffff80002cca20e0,0,ffff80002cca21d0) at dofilewritev+0x19c sys/kern/sys_generic.c:375 sys_writev(ffff80002b412868,ffff80002cca2188,ffff80002cca21d0) at sys_writev+0xa7 sys/kern/sys_generic.c:322 syscall(ffff80002cca2250) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9b6786edbd0, count: -8 ddb> machine ddbcpu 1 No such command ddb> trace ffs2_balloc(fffffd806e3c3b50,30000,4000,fffffd807f7d77b8,0,ffff80002cca1e28) at ffs2_balloc+0x7ae sys/ufs/ffs/ffs_balloc.c:660 ffs_write(ffff80002cca1ec0) at ffs_write+0x411 sys/ufs/ffs/ffs_vnops.c:346 VOP_WRITE(fffffd8067c9eeb8,ffff80002cca20e0,1,fffffd807f7d77b8) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 vn_write(fffffd80759e2d98,ffff80002cca20e0,0) at vn_write+0x152 sys/kern/vfs_vnops.c:408 dofilewritev(ffff80002b412868,5,ffff80002cca20e0,0,ffff80002cca21d0) at dofilewritev+0x19c sys/kern/sys_generic.c:375 sys_writev(ffff80002b412868,ffff80002cca2188,ffff80002cca21d0) at sys_writev+0xa7 sys/kern/sys_generic.c:322 syscall(ffff80002cca2250) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9b6786edbd0, count: -8