panic: pool_do_get: fdescpl free list modified: page 0xfffffd807e7f7000; item addr 0xfffffd807e7f7878; offset 0x48=0xdeaf4153 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *418515 79952 0 0x2 0 0 syz-executor.3 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82790067) at panic+0x161 sys/kern/subr_prf.c:198 pool_do_get(ffffffff82c74838,9,ffff80002ce50878) at pool_do_get+0x465 sys/kern/subr_pool.c:739 pool_get(ffffffff82c74838,9) at pool_get+0xb3 sys/kern/subr_pool.c:582 fdcopy(ffff8000fffee7f0) at fdcopy+0x44 fdinit sys/kern/kern_descrip.c:1067 [inline] fdcopy(ffff8000fffee7f0) at fdcopy+0x44 sys/kern/kern_descrip.c:1106 process_new(ffff8000fffec5a0,ffff8000fffee7f0,1) at process_new+0x2bc sys/kern/kern_fork.c:255 fork1(ffff8000216dc850,1,ffffffff810bbf00,0,ffff80002ce50ac0,0) at fork1+0x30c sys/kern/kern_fork.c:379 syscall(ffff80002ce50b40) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffeadf0, 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: pool_do_get: fdescpl free list modified: page 0xfffffd807e7f7000; item addr 0xfffffd807e7f7878; offset 0x48=0xdeaf4153 ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82790067) at panic+0x161 sys/kern/subr_prf.c:198 pool_do_get(ffffffff82c74838,9,ffff80002ce50878) at pool_do_get+0x465 sys/kern/subr_pool.c:739 pool_get(ffffffff82c74838,9) at pool_get+0xb3 sys/kern/subr_pool.c:582 fdcopy(ffff8000fffee7f0) at fdcopy+0x44 fdinit sys/kern/kern_descrip.c:1067 [inline] fdcopy(ffff8000fffee7f0) at fdcopy+0x44 sys/kern/kern_descrip.c:1106 process_new(ffff8000fffec5a0,ffff8000fffee7f0,1) at process_new+0x2bc sys/kern/kern_fork.c:255 fork1(ffff8000216dc850,1,ffffffff810bbf00,0,ffff80002ce50ac0,0) at fork1+0x30c sys/kern/kern_fork.c:379 syscall(ffff80002ce50b40) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffeadf0, count: -9 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80002ce506f0 rbx 0xdeaf4153 rdx 0 rcx 0 rax 0xffff8000216dc850 r8 0x101010101010101 r9 0x8080808080808080 r10 0x973aa41ec96740c1 r11 0xbee8161b34422d36 r12 0 r13 0xfffffd807e7f7878 r14 0 r15 0x1 rip 0xffffffff81a69eb8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002ce506e0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.3) pid=418515 stat=onproc flags process=2 proc=0 pri=84, usrpri=84, nice=20 forw=0xffffffffffffffff, list=0xffff80002e8c42f8,0xffff8000fffed348 process=0xffff8000fffee7f0 user=0xffff80002ce4b000, vmspace=0xfffffd807e9c1970 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 48203 206426 96112 0 2 0 syz-executor.5 48203 32972 96112 0 2 0x4000000 syz-executor.5 48203 268514 96112 0 2 0x4000000 syz-executor.5 48203 266023 96112 0 2 0x4000000 syz-executor.5 97737 320145 12581 0 2 0 syz-executor.7 97737 453565 12581 0 3 0x4000080 fsleep syz-executor.7 82208 310173 43752 60928 2 0x10 syz-executor.4 82208 17223 43752 60928 3 0x4000090 fsleep syz-executor.4 82208 173842 43752 60928 3 0x4000090 fsleep syz-executor.4 74346 271028 56309 0 2 0 syz-executor.0 74346 315591 56309 0 3 0x4000000 fdlock syz-executor.0 74346 502434 56309 0 3 0x4000080 sysctllk syz-executor.0 *79952 418515 1426 0 7 0x2 syz-executor.3 40384 301396 1426 0 2 0x2 syz-executor.6 29303 490547 1426 0 3 0x82 nanoslp syz-executor.2 12581 287169 1426 0 3 0x82 nanoslp syz-executor.7 43752 24852 1426 0 3 0x82 nanoslp syz-executor.4 56309 216430 1426 0 3 0x82 nanoslp syz-executor.0 96112 44150 1426 0 3 0x82 nanoslp syz-executor.5 70097 401081 1426 0 2 0x2 syz-executor.1 63652 387421 0 0 3 0x14200 bored sosplice 91979 174457 0 0 3 0x14280 nfsidl nfsio 46578 179397 0 0 3 0x14280 nfsidl nfsio 91327 478482 0 0 3 0x14280 nfsidl nfsio 33366 306053 0 0 3 0x14280 nfsidl nfsio 36493 279656 0 0 3 0x14280 nfsidl nfsio 76377 429881 0 0 3 0x14280 nfsidl nfsio 53885 714 0 0 3 0x14280 nfsidl nfsio 97756 86022 0 0 3 0x14280 nfsidl nfsio 92467 268231 0 0 3 0x14280 nfsidl nfsio 68093 91083 0 0 3 0x14280 nfsidl nfsio 31959 279714 0 0 3 0x14280 nfsidl nfsio 36343 382072 0 0 3 0x14280 nfsidl nfsio 50731 365954 0 0 3 0x14280 nfsidl nfsio 43950 74546 0 0 3 0x14280 nfsidl nfsio 31691 139768 0 0 3 0x14280 nfsidl nfsio 16087 469454 0 0 3 0x14280 nfsidl nfsio 21469 292215 0 0 3 0x14280 nfsidl nfsio 81365 3485 0 0 3 0x14280 nfsidl nfsio 81343 52832 0 0 3 0x14280 nfsidl nfsio 19333 67458 0 0 3 0x14280 nfsidl nfsio 1426 295549 88253 0 3 0x82 wait syz-fuzzer 1426 350215 88253 0 3 0x4000082 thrsleep syz-fuzzer 1426 156465 88253 0 3 0x4000082 wait syz-fuzzer 1426 181029 88253 0 3 0x4000082 thrsleep syz-fuzzer 1426 259711 88253 0 3 0x4000082 wait syz-fuzzer 1426 284657 88253 0 3 0x4000082 kqread syz-fuzzer 1426 2940 88253 0 3 0x4000082 wait syz-fuzzer 1426 9379 88253 0 3 0x4000082 thrsleep syz-fuzzer 1426 18898 88253 0 3 0x4000082 wait syz-fuzzer 1426 133158 88253 0 3 0x4000082 wait syz-fuzzer 1426 417318 88253 0 3 0x4000082 thrsleep syz-fuzzer 1426 462290 88253 0 3 0x4000082 thrsleep syz-fuzzer 1426 293020 88253 0 3 0x4000082 wait syz-fuzzer 1426 326287 88253 0 3 0x4000082 wait syz-fuzzer 88253 84093 58025 0 3 0x10008a sigsusp ksh 58025 116083 24939 0 3 0x9a kqread sshd 51977 366375 1 0 3 0x100083 ttyin getty 24939 178190 1 0 3 0x88 kqread sshd 98444 378076 55984 73 3 0x1100090 kqread syslogd 55984 199016 1 0 3 0x100082 netio syslogd 18452 428336 1 0 3 0x100080 kqread resolvd 7195 102478 0 0 3 0x14200 bored smr 82756 485487 0 0 2 0x14200 zerothread 16608 337900 0 0 3 0x14200 aiodoned aiodoned 29366 94170 0 0 3 0x14200 syncer update 2052 1622 0 0 3 0x14200 cleaner cleaner 95716 39870 0 0 3 0x14200 reaper reaper 38360 148244 0 0 3 0x14200 pgdaemon pagedaemon 34873 268535 0 0 3 0x14200 bored viomb 33038 267916 0 0 3 0x40014200 acpi0 acpi0 29957 518401 0 0 3 0x14200 bored softnet 64069 241109 0 0 3 0x14200 bored softnet 16874 375486 0 0 3 0x14200 bored softnet 37155 292977 0 0 3 0x14200 bored softnet 71546 388658 0 0 3 0x14200 bored systqmp 40554 466854 0 0 3 0x14200 bored systq 35653 236948 0 0 3 0x40014200 bored softclock 1738 504216 0 0 3 0x40014200 idle0 1 313075 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 10217 6413K 6722K 78643K 13055 0 pcb 13 20K 25K 78643K 1071 0 rtable 200 16K 18K 78643K 2318 0 ifaddr 81 23K 26K 78643K 811 0 sysctl 3 1K 3K 78643K 10 0 counters 28 17K 18K 78643K 256 0 ioctlops 0 0K 2K 78643K 1144 0 iov 0 0K 32K 78643K 3038 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1332 83K 84K 78643K 4661 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 61 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 339 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 14 49K 77K 78643K 6732 0 sigio 0 0K 0K 78643K 525 0 proc 56 43K 83K 78643K 1843 0 subproc 104 6K 6K 78643K 627 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 469 0 in_multi 82 5K 6K 78643K 708 0 ether_multi 1 0K 0K 78643K 25 0 mrt 1 0K 0K 78643K 34 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 217 970K 970K 78643K 217 0 exec 0 0K 1K 78643K 2236 0 pfkey data 0 0K 0K 78643K 4 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 266 82K 95K 78643K 44587 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 328 0 NDP 14 0K 1K 78643K 263 0 temp 138 5771K 71434K 78643K 98460 0 kqueue 6 10K 26K 78643K 689 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 120 773 0 772 8 5 3 3 0 8 2 rtentry 112 698 0 616 4 1 3 4 0 8 0 unpcb 144 24074 0 24066 129 127 2 15 0 8 1 syncache 296 75 0 75 16 16 0 1 0 8 0 tcpqe 32 375 0 375 14 14 0 1 0 8 0 tcpcb 776 2595 0 2586 90 88 2 14 0 8 0 arp 88 106 0 89 1 0 1 1 0 8 0 ipq 40 2 0 2 2 2 0 1 0 8 0 ipqe 40 134 0 134 2 2 0 1 0 8 0 inpcb 336 7847 0 7833 103 96 7 12 0 8 3 nd6 48 157 0 140 1 0 1 1 0 8 0 pkpcb 40 143 0 143 5 5 0 2 0 8 0 kcovpl 48 48 0 40 1 0 1 1 0 8 0 mppekey 1024 12 0 12 5 5 0 1 0 8 0 ppxss 1160 118 0 118 16 16 0 1 0 8 0 pppxif 1360 71 0 71 9 9 0 1 0 8 0 pfstscr 40 78 0 3 1 0 1 1 0 8 0 pfosfp 40 38 0 37 1 0 1 1 0 8 0 pfosfpen 112 38 0 36 1 0 1 1 0 8 0 pfanchor 1280 1293 9 846 47 4 43 43 0 8 0 pfqueue 264 3 0 3 1 1 0 1 0 8 0 pfstitem 24 147 0 145 1 0 1 1 0 8 0 pfstkey 128 153 0 80 3 0 3 3 0 8 0 pfstate 352 78 0 3 7 0 7 7 0 8 0 rttmr 136 9 0 9 4 4 0 1 0 8 0 art_heap8 4096 6 0 5 5 3 2 3 0 8 1 art_heap4 256 2988 0 2619 42 15 27 30 0 8 0 art_table 32 2994 0 2624 4 0 4 4 0 8 0 art_node 16 676 0 605 1 0 1 1 0 8 0 sysvmsgpl 40 54 0 14 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 337 0 327 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 10486 0 9039 93 1 92 92 0 8 0 ffsino 240 10486 0 9039 86 0 86 86 0 8 0 nchpl 144 20233 0 19681 63 41 22 63 0 8 0 rtmask 32 8 0 8 4 4 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 83194 0 83193 5 4 1 3 0 8 0 vmpool 664 62 0 62 8 8 0 1 0 8 0 kstatmem 264 314 0 286 3 0 3 3 0 8 0 scxspl 216 57657 0 57657 24 23 1 8 0 8 1 plimitpl 152 1197 0 1183 1 0 1 1 0 8 0 sigapl 424 6964 0 6904 8 0 8 8 0 8 0 futexpl 64 84206 0 84203 1 0 1 1 0 8 0 knotepl 120 121430 0 121366 60 52 8 12 0 8 4 kqueuepl 184 1723 0 1718 22 21 1 5 0 8 0 pipepl 288 1948 0 1920 40 37 3 7 0 8 0 fdescpl 432 6927 0 6905 4 1 3 4 0 8 0 pool(0xffffffff82c74838:fdescpl): page inconsistency: page 0xfffffd807e7f7000; 0 on list, 8 missing, 9 items per page filepl 120 75531 0 75309 122 110 12 22 0 8 3 lockfpl 104 2584 0 2583 6 4 2 2 0 8 1 lockfspl 48 524 0 523 1 0 1 1 0 8 0 sessionpl 144 63 0 48 1 0 1 1 0 8 0 pgrppl 48 389 0 374 1 0 1 1 0 8 0 ucredpl 104 6502 0 6494 1 0 1 1 0 8 0 zombiepl 144 6905 0 6904 3 2 1 1 0 8 0 processpl 1008 6965 0 6904 10 2 8 9 0 8 0 procpl 696 17068 0 16986 12 3 9 10 0 8 0 sosppl 168 67 0 67 11 10 1 1 0 8 1 sockpl 456 32882 0 32862 819 807 12 50 0 8 6 mcl64k 65536 302 0 302 16 15 1 1 0 8 1 mcl16k 16384 136 0 136 20 19 1 1 0 8 1 mcl12k 12288 284 0 284 15 14 1 1 0 8 1 mcl9k 9216 76 0 76 18 17 1 1 0 8 1 mcl8k 8192 518 0 518 11 10 1 1 0 8 1 mcl4k 4096 932 0 932 7 6 1 1 0 8 1 mcl2k2 2112 73 0 73 21 21 0 1 0 8 0 mcl2k 2048 90096 0 90050 54 46 8 29 0 8 0 mtagpl 96 26 0 26 4 4 0 1 0 8 0 mbufpl 256 246821 0 246657 1096 1057 39 415 0 8 20 bufpl 288 16715 0 10321 457 0 457 457 0 8 0 anonpl 24 1370963 0 1355275 217 101 116 137 0 188 0 amapchunkpl 152 123802 0 123151 58 29 29 36 0 158 0 amappl16 200 13887 0 13286 91 58 33 45 0 8 0 amappl15 192 16 0 14 1 0 1 1 0 8 0 amappl14 184 306 0 295 2 1 1 2 0 8 0 amappl13 176 6 0 6 1 1 0 1 0 8 0 amappl12 168 883 0 879 1 0 1 1 0 8 0 amappl11 160 43 0 39 1 0 1 1 0 8 0 amappl10 152 75 0 66 1 0 1 1 0 8 0 amappl9 144 989 0 987 1 0 1 1 0 8 0 amappl8 136 346 0 279 4 1 3 3 0 8 0 amappl7 128 242 0 221 2 0 2 2 0 8 0 amappl6 120 375 0 361 2 1 1 2 0 8 0 amappl5 112 374 0 370 1 0 1 1 0 8 0 amappl4 104 1012 0 988 2 1 1 2 0 8 0 amappl3 96 19232 0 19194 2 0 2 2 0 8 0 amappl2 88 7825 0 7773 3 0 3 3 0 8 0 amappl1 80 158102 0 157542 26 12 14 26 0 8 0 amappl 88 43527 0 43369 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 6989 0 6967 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 6989 0 6967 1 0 1 1 0 8 0 vmmpekpl 168 55382 0 55325 3 0 3 3 0 8 0 vmmpepl 168 653289 0 650969 278 149 129 143 0 357 10 vmsppl 344 6988 0 6967 3 0 3 3 0 8 0 rwobjpl 24 172310 0 164747 48 0 48 48 0 8 0 pdppl 4096 13984 0 13934 506 448 58 70 0 8 8 pvpl 32 2714528 0 2694080 468 271 197 333 0 265 0 pmappl 216 6988 0 6967 2 0 2 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 2561 0 1773 34 0 34 34 0 8 2 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82790067) at panic+0x161 sys/kern/subr_prf.c:198 pool_do_get(ffffffff82c74838,9,ffff80002ce50878) at pool_do_get+0x465 sys/kern/subr_pool.c:739 pool_get(ffffffff82c74838,9) at pool_get+0xb3 sys/kern/subr_pool.c:582 fdcopy(ffff8000fffee7f0) at fdcopy+0x44 fdinit sys/kern/kern_descrip.c:1067 [inline] fdcopy(ffff8000fffee7f0) at fdcopy+0x44 sys/kern/kern_descrip.c:1106 process_new(ffff8000fffec5a0,ffff8000fffee7f0,1) at process_new+0x2bc sys/kern/kern_fork.c:255 fork1(ffff8000216dc850,1,ffffffff810bbf00,0,ffff80002ce50ac0,0) at fork1+0x30c sys/kern/kern_fork.c:379 syscall(ffff80002ce50b40) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffeadf0, count: -9 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82790067) at panic+0x161 sys/kern/subr_prf.c:198 pool_do_get(ffffffff82c74838,9,ffff80002ce50878) at pool_do_get+0x465 sys/kern/subr_pool.c:739 pool_get(ffffffff82c74838,9) at pool_get+0xb3 sys/kern/subr_pool.c:582 fdcopy(ffff8000fffee7f0) at fdcopy+0x44 fdinit sys/kern/kern_descrip.c:1067 [inline] fdcopy(ffff8000fffee7f0) at fdcopy+0x44 sys/kern/kern_descrip.c:1106 process_new(ffff8000fffec5a0,ffff8000fffee7f0,1) at process_new+0x2bc sys/kern/kern_fork.c:255 fork1(ffff8000216dc850,1,ffffffff810bbf00,0,ffff80002ce50ac0,0) at fork1+0x30c sys/kern/kern_fork.c:379 syscall(ffff80002ce50b40) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:625 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffeadf0, count: -9