uvm_fault(0xffffffff82c19bf0, 0xffff80001b75f0a8, 0, 2) -> d kernel: page fault trap, code=0 Stopped at ffs2_balloc+0x16c2: movq %rbx,0(%rcx,%rax,8) TID PID UID PRFLAGS PFLAGS CPU COMMAND *346580 26597 0 0x2 0x4000001 0 syz-fuzzer ffs2_balloc(fffffd80764c4c38,84000,48c,fffffd807f7d77b8,1,ffff800027fd3658) at ffs2_balloc+0x16c2 sys/ufs/ffs/ffs_balloc.c:747 ffs_write(ffff800027fd36f0) at ffs_write+0x411 sys/ufs/ffs/ffs_vnops.c:346 VOP_WRITE(fffffd805b0ad030,ffff800027fd37a0,3,fffffd807f7d77b8) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 ktrwriteraw(ffff8000216df5e8,fffffd805b0ad030,fffffd807f7d77b8,ffff800027fd3868,ffff800027fd3840) at ktrwriteraw+0x13d sys/kern/kern_ktrace.c:660 ktrgenio(ffff8000216df5e8,1,1,ffff8000006c5870,54a8) at ktrgenio+0x27b ktrwrite2 sys/kern/kern_ktrace.c:624 [inline] ktrgenio(ffff8000216df5e8,1,1,ffff8000006c5870,54a8) at ktrgenio+0x27b sys/kern/kern_ktrace.c:259 dofilewritev(ffff8000216df5e8,1,ffff800027fd39e8,0,ffff800027fd3ad0) at dofilewritev+0x38a sys/kern/sys_generic.c:396 sys_write(ffff8000216df5e8,ffff800027fd3a80,ffff800027fd3ad0) at sys_write+0x83 sys/kern/sys_generic.c:295 syscall(ffff800027fd3b50) at syscall+0x446 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2a6da7360, count: 6 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(0xffffffff82c19bf0, 0xffff80001b75f0a8, 0, 2) -> d ddb> trace ffs2_balloc(fffffd80764c4c38,84000,48c,fffffd807f7d77b8,1,ffff800027fd3658) at ffs2_balloc+0x16c2 sys/ufs/ffs/ffs_balloc.c:747 ffs_write(ffff800027fd36f0) at ffs_write+0x411 sys/ufs/ffs/ffs_vnops.c:346 VOP_WRITE(fffffd805b0ad030,ffff800027fd37a0,3,fffffd807f7d77b8) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 ktrwriteraw(ffff8000216df5e8,fffffd805b0ad030,fffffd807f7d77b8,ffff800027fd3868,ffff800027fd3840) at ktrwriteraw+0x13d sys/kern/kern_ktrace.c:660 ktrgenio(ffff8000216df5e8,1,1,ffff8000006c5870,54a8) at ktrgenio+0x27b ktrwrite2 sys/kern/kern_ktrace.c:624 [inline] ktrgenio(ffff8000216df5e8,1,1,ffff8000006c5870,54a8) at ktrgenio+0x27b sys/kern/kern_ktrace.c:259 dofilewritev(ffff8000216df5e8,1,ffff800027fd39e8,0,ffff800027fd3ad0) at dofilewritev+0x38a sys/kern/sys_generic.c:396 sys_write(ffff8000216df5e8,ffff800027fd3a80,ffff800027fd3ad0) at sys_write+0x83 sys/kern/sys_generic.c:295 syscall(ffff800027fd3b50) at syscall+0x446 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2a6da7360, count: -9 ddb> show registers rdi 0 rsi 0 rbp 0xffff800027fd3610 rbx 0x79058 acpi_pdirpa+0x64ebb rdx 0 rcx 0xffff80001b75f000 rax 0x15 r8 0x4000 __ALIGN_SIZE+0x3000 r9 0 r10 0x65d3782f3f34df10 r11 0x1f941d88e579f1e0 r12 0xfffffd805b0ad030 r13 0xfffffd80764c4c38 r14 0x205800 acpi_pdirpa+0x1f1663 r15 0xfffffd8067c82480 rip 0xffffffff823222b2 ffs2_balloc+0x16c2 cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff800027fd3480 ss 0x10 ffs2_balloc+0x16c2: movq %rbx,0(%rcx,%rax,8) ddb> show proc PROC (syz-fuzzer) pid=346580 stat=onproc flags process=2 proc=4000001 pri=51, usrpri=52, nice=20 forw=0xffffffffffffffff, list=0xffff800021700020,0xffff8000216de038 process=0xffff8000ffff6400 user=0xffff800027fce000, vmspace=0xfffffd807f013440 estcpu=2, cpticks=1, pctcpu=0.39 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 61774 255300 89309 0 3 0x80 nanoslp syz-executor.6 61774 18043 89309 0 3 0x4000080 ttyin syz-executor.6 61774 477092 89309 0 3 0x4000080 fsleep syz-executor.6 29809 243846 26597 0 3 0x82 piperd syz-executor.2 85269 522035 26597 0 3 0x82 piperd syz-executor.0 95072 190005 26597 0 3 0x82 piperd syz-executor.7 26270 140842 26597 0 3 0x82 piperd syz-executor.1 67257 181531 26597 0 3 0x82 piperd syz-executor.5 89309 196689 26597 0 3 0x82 nanoslp syz-executor.6 52289 119864 26597 0 2 0x2 syz-executor.4 57379 56098 1 0 3 0x100083 ttyin getty 90400 204378 26597 0 3 0x82 piperd syz-executor.3 34112 241274 0 0 3 0x14200 bored sosplice 26597 309031 57801 0 3 0x82 thrsleep syz-fuzzer 26597 474983 57801 0 3 0x4000082 nanoslp syz-fuzzer 26597 290034 57801 0 3 0x4000082 wait syz-fuzzer 26597 29020 57801 0 3 0x4000082 thrsleep syz-fuzzer 26597 186366 57801 0 3 0x4000082 wait syz-fuzzer 26597 443388 57801 0 3 0x4000082 thrsleep syz-fuzzer 26597 260292 57801 0 3 0x4000082 wait syz-fuzzer 26597 385064 57801 0 3 0x4000082 thrsleep syz-fuzzer *26597 346580 57801 0 7 0x4000003 syz-fuzzer 26597 388434 57801 0 3 0x4000082 thrsleep syz-fuzzer 26597 273407 57801 0 3 0x4000082 wait syz-fuzzer 26597 138527 57801 0 3 0x4000082 wait syz-fuzzer 26597 19340 57801 0 3 0x4000082 wait syz-fuzzer 26597 409687 57801 0 3 0x4000082 wait syz-fuzzer 26597 349173 57801 0 3 0x4000082 wait syz-fuzzer 57801 119267 2193 0 3 0x10008a sigsusp ksh 2193 203717 3623 0 2 0x9a sshd 3623 360687 1 0 3 0x88 kqread sshd 6141 447525 24882 73 3 0x1100090 kqread syslogd 24882 494970 1 0 3 0x100082 netio syslogd 88689 361984 1 0 3 0x100080 kqread resolvd 92628 370971 15666 77 3 0x100092 kqread dhcpleased 67362 345364 15666 77 3 0x100092 kqread dhcpleased 15666 246806 1 0 3 0x80 kqread dhcpleased 884 254534 0 0 3 0x14200 bored smr 22330 426310 0 0 2 0x14200 zerothread 77634 272034 0 0 3 0x14200 aiodoned aiodoned 32305 446045 0 0 3 0x14200 syncer update 76521 298939 0 0 3 0x14200 cleaner cleaner 49951 77558 0 0 3 0x14200 reaper reaper 37022 497908 0 0 3 0x14200 pgdaemon pagedaemon 81662 161965 0 0 3 0x14200 bored viomb 72287 381934 0 0 3 0x40014200 acpi0 acpi0 52921 337297 0 0 3 0x14200 bored softnet 1091 280855 0 0 3 0x14200 bored softnet 4572 224893 0 0 3 0x14200 bored softnet 49271 338980 0 0 3 0x14200 bored softnet 85825 210893 0 0 3 0x14200 bored systqmp 73810 190622 0 0 3 0x14200 bored systq 40292 337470 0 0 2 0x40014200 softclock 64808 245207 0 0 3 0x40014200 idle0 1 486627 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 10231 6440K 7266K 78643K 24124 0 pcb 13 24K 28K 78643K 12830 0 rtable 190 16K 17K 78643K 2949 0 ifaddr 74 24K 28K 78643K 1231 0 sysctl 3 1K 1K 78643K 8 0 counters 28 17K 17K 78643K 711 0 ioctlops 0 0K 4K 78643K 2560 0 iov 0 0K 32K 78643K 2754 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1564 98K 98K 78643K 10790 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 133 0 VM map 2 0K 0K 78643K 2 0 sem 18 10K 20K 78643K 1450 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 11 37K 69K 78643K 15010 0 sigio 0 0K 0K 78643K 266 0 proc 65 59K 83K 78643K 2031 0 subproc 104 6K 7K 78643K 523 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 1423 0 in_multi 59 4K 7K 78643K 805 0 ether_multi 1 0K 0K 78643K 108 0 mrt 1 0K 0K 78643K 48 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 259 1155K 1155K 78643K 259 0 exec 0 0K 1K 78643K 2542 0 pfkey data 0 0K 0K 78643K 75 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 348 95K 112K 78643K 102479 0 UVM aobj 131 8K 8K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 655 0 NDP 13 0K 1K 78643K 379 0 temp 142 5774K 71307K 78643K 154404 0 kqueue 12 18K 26K 78643K 1242 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 1249 0 1246 19 18 1 3 0 8 0 rtentry 112 757 0 679 4 0 4 4 0 8 0 unpcb 144 47508 0 47495 299 293 6 16 0 8 5 syncache 296 114 0 114 29 29 0 1 0 8 0 tcpqe 32 656 37 656 9 9 0 1 0 8 0 tcpcb 776 7647 0 7637 276 274 2 14 0 8 0 arp 88 99 0 81 1 0 1 1 0 8 0 ipq 40 8 0 8 6 6 0 1 0 8 0 ipqe 40 90 0 90 6 6 0 1 0 8 0 inpcb 336 27823 0 27809 344 337 7 20 0 8 4 nd6 48 144 0 128 1 0 1 1 0 8 0 pkpcb 40 93 0 93 7 7 0 1 0 8 0 kcovpl 48 40 0 32 1 0 1 1 0 8 0 mppekey 1024 7 0 7 2 2 0 1 0 8 0 ppxss 1160 556 0 556 33 33 0 1 0 8 0 pppxif 1360 163 0 163 14 14 0 1 0 8 0 rttmr 136 11 0 11 4 4 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 3070 0 2781 45 19 26 31 0 8 0 art_table 32 3071 0 2781 4 0 4 4 0 8 0 art_node 16 683 0 616 1 0 1 1 0 8 0 sysvmsgpl 40 92 0 86 1 0 1 1 0 8 0 semapl 112 1437 0 1421 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 22508 0 21012 94 0 94 94 0 8 0 ffsino 240 22508 0 21012 89 0 89 89 0 8 0 nchpl 144 42959 0 41326 63 0 63 63 0 8 0 rtmask 32 25 0 25 8 8 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 158890 0 158890 10 9 1 2 0 8 1 vmpool 664 150 0 150 15 15 0 1 0 8 0 kstatmem 264 572 0 546 11 9 2 3 0 8 0 scsiplug 72 16 0 16 6 6 0 1 0 8 0 scxspl 216 115503 0 115503 29 28 1 8 0 8 1 plimitpl 152 2311 0 2296 1 0 1 1 0 8 0 sigapl 424 15443 0 15404 8 0 8 8 0 8 0 futexpl 64 185399 0 185398 3 2 1 1 0 8 0 knotepl 120 243060 0 242980 95 89 6 11 0 8 0 kqueuepl 184 3502 0 3494 56 55 1 6 0 8 0 pipepl 288 3908 0 3880 104 101 3 10 0 8 0 fdescpl 432 15224 0 15202 4 0 4 4 0 8 0 filepl 120 164138 0 163901 262 247 15 23 0 8 2 lockfpl 104 6848 0 6846 10 9 1 2 0 8 0 lockfspl 48 2018 0 2016 1 0 1 1 0 8 0 sessionpl 144 59 0 43 1 0 1 1 0 8 0 pgrppl 48 160 0 144 1 0 1 1 0 8 0 ucredpl 104 15679 0 15669 1 0 1 1 0 8 0 zombiepl 144 15404 0 15404 7 6 1 1 0 8 1 processpl 1008 15443 0 15404 10 2 8 9 0 8 0 procpl 696 42960 0 42905 38 30 8 10 0 8 0 sosppl 168 177 0 176 16 15 1 1 0 8 0 sockpl 456 76871 0 76835 2238 2207 31 64 0 8 22 mcl64k 65536 645 0 645 41 40 1 1 0 8 1 mcl16k 16384 1159 0 1159 42 41 1 1 0 8 1 mcl12k 12288 878 0 878 42 41 1 1 0 8 1 mcl9k 9216 160 0 160 49 49 0 1 0 8 0 mcl8k 8192 824 0 824 40 39 1 1 0 8 1 mcl4k 4096 1786 0 1786 18 17 1 1 0 8 1 mcl2k2 2112 158 0 158 45 45 0 1 0 8 0 mcl2k 2048 108863 0 108786 81 70 11 29 0 8 0 mtagpl 96 1096 0 1087 15 11 4 10 0 8 1 mbufpl 256 367844 0 367647 739 713 26 83 0 8 2 bufpl 288 26733 0 20312 459 0 459 459 0 8 0 anonpl 24 2998891 0 2983024 296 176 120 137 0 188 0 amapchunkpl 152 291213 0 290591 167 137 30 43 0 158 1 amappl16 200 27159 0 26562 194 160 34 48 0 8 0 amappl15 192 5 0 5 2 2 0 1 0 8 0 amappl14 184 271 0 259 2 1 1 2 0 8 0 amappl13 176 6 0 5 1 0 1 1 0 8 0 amappl12 168 796 0 792 1 0 1 1 0 8 0 amappl11 160 50 0 40 1 0 1 1 0 8 0 amappl10 152 71 0 60 1 0 1 1 0 8 0 amappl9 144 990 0 988 2 1 1 1 0 8 0 amappl8 136 520 0 403 8 3 5 5 0 8 0 amappl7 128 255 0 230 2 0 2 2 0 8 0 amappl6 120 421 0 397 1 0 1 1 0 8 0 amappl5 112 455 0 449 1 0 1 1 0 8 0 amappl4 104 1966 0 1935 2 1 1 2 0 8 0 amappl3 96 45590 0 45550 2 0 2 2 0 8 0 amappl2 88 16192 0 16128 3 1 2 3 0 8 0 amappl1 80 351017 0 350388 24 7 17 22 0 8 0 amappl 88 101267 0 101102 6 1 5 6 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 15374 0 15352 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 15374 0 15352 1 0 1 1 0 8 0 vmmpekpl 168 123662 0 123606 3 0 3 3 0 8 0 vmmpepl 168 1392320 0 1389894 508 371 137 162 0 357 0 vmsppl 272 15373 0 15352 3 1 2 2 0 8 0 rwobjpl 24 373966 0 366223 49 0 49 49 0 8 0 pdppl 4096 30754 0 30704 675 611 64 66 0 8 14 pvpl 32 5615231 0 5594479 597 398 199 253 0 265 0 pmappl 216 15373 0 15352 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 2807 0 2016 25 0 25 25 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace ffs2_balloc(fffffd80764c4c38,84000,48c,fffffd807f7d77b8,1,ffff800027fd3658) at ffs2_balloc+0x16c2 sys/ufs/ffs/ffs_balloc.c:747 ffs_write(ffff800027fd36f0) at ffs_write+0x411 sys/ufs/ffs/ffs_vnops.c:346 VOP_WRITE(fffffd805b0ad030,ffff800027fd37a0,3,fffffd807f7d77b8) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 ktrwriteraw(ffff8000216df5e8,fffffd805b0ad030,fffffd807f7d77b8,ffff800027fd3868,ffff800027fd3840) at ktrwriteraw+0x13d sys/kern/kern_ktrace.c:660 ktrgenio(ffff8000216df5e8,1,1,ffff8000006c5870,54a8) at ktrgenio+0x27b ktrwrite2 sys/kern/kern_ktrace.c:624 [inline] ktrgenio(ffff8000216df5e8,1,1,ffff8000006c5870,54a8) at ktrgenio+0x27b sys/kern/kern_ktrace.c:259 dofilewritev(ffff8000216df5e8,1,ffff800027fd39e8,0,ffff800027fd3ad0) at dofilewritev+0x38a sys/kern/sys_generic.c:396 sys_write(ffff8000216df5e8,ffff800027fd3a80,ffff800027fd3ad0) at sys_write+0x83 sys/kern/sys_generic.c:295 syscall(ffff800027fd3b50) at syscall+0x446 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2a6da7360, count: -9 ddb> machine ddbcpu 1 No such command ddb> trace ffs2_balloc(fffffd80764c4c38,84000,48c,fffffd807f7d77b8,1,ffff800027fd3658) at ffs2_balloc+0x16c2 sys/ufs/ffs/ffs_balloc.c:747 ffs_write(ffff800027fd36f0) at ffs_write+0x411 sys/ufs/ffs/ffs_vnops.c:346 VOP_WRITE(fffffd805b0ad030,ffff800027fd37a0,3,fffffd807f7d77b8) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245 ktrwriteraw(ffff8000216df5e8,fffffd805b0ad030,fffffd807f7d77b8,ffff800027fd3868,ffff800027fd3840) at ktrwriteraw+0x13d sys/kern/kern_ktrace.c:660 ktrgenio(ffff8000216df5e8,1,1,ffff8000006c5870,54a8) at ktrgenio+0x27b ktrwrite2 sys/kern/kern_ktrace.c:624 [inline] ktrgenio(ffff8000216df5e8,1,1,ffff8000006c5870,54a8) at ktrgenio+0x27b sys/kern/kern_ktrace.c:259 dofilewritev(ffff8000216df5e8,1,ffff800027fd39e8,0,ffff800027fd3ad0) at dofilewritev+0x38a sys/kern/sys_generic.c:396 sys_write(ffff8000216df5e8,ffff800027fd3a80,ffff800027fd3ad0) at sys_write+0x83 sys/kern/sys_generic.c:295 syscall(ffff800027fd3b50) at syscall+0x446 sys/arch/amd64/amd64/trap.c:599 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2a6da7360, count: -9