panic: pool_do_get: filepl free list modified: page 0xfffffd8057c24000; item addr 0xfffffd8057c24018; offset 0x0=0xeb4457d600000000 != 0xeb4457d617932e96 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 16644 41212 0 0x10 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8244f00b) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff8281bd40,9,ffff80001d79df18) at pool_do_get+0x42a sys/kern/subr_pool.c:738 pool_get(ffffffff8281bd40,9) at pool_get+0xb5 sys/kern/subr_pool.c:581 falloc(ffff80001d718600,ffff80001d79dff0,ffff80001d79e020) at falloc+0x103 fnew sys/kern/kern_descrip.c:1048 [inline] falloc(ffff80001d718600,ffff80001d79dff0,ffff80001d79e020) at falloc+0x103 sys/kern/kern_descrip.c:1022 sys_socketpair(ffff80001d718600,ffff80001d79e098,ffff80001d79e0e0) at sys_socketpair+0x1b0 sys/kern/uipc_syscalls.c:452 syscall(ffff80001d79e160) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5b6bdba9e70, 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 pool_do_get: filepl free list modified: page 0xfffffd8057c24000; item addr 0xfffffd8057c24018; offset 0x0=0xeb4457d600000000 != 0xeb4457d617932e96 ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8244f00b) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff8281bd40,9,ffff80001d79df18) at pool_do_get+0x42a sys/kern/subr_pool.c:738 pool_get(ffffffff8281bd40,9) at pool_get+0xb5 sys/kern/subr_pool.c:581 falloc(ffff80001d718600,ffff80001d79dff0,ffff80001d79e020) at falloc+0x103 fnew sys/kern/kern_descrip.c:1048 [inline] falloc(ffff80001d718600,ffff80001d79dff0,ffff80001d79e020) at falloc+0x103 sys/kern/kern_descrip.c:1022 sys_socketpair(ffff80001d718600,ffff80001d79e098,ffff80001d79e0e0) at sys_socketpair+0x1b0 sys/kern/uipc_syscalls.c:452 syscall(ffff80001d79e160) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5b6bdba9e70, count: -8 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80001d79dd80 rbx 0xffff80001d79de30 rdx 0x2 rcx 0 rax 0x1 r8 0xffffffff81ad64bf kprintf+0x15f r9 0x1 r10 0x2 r11 0x4f7c3197fbbb3b70 r12 0x3000000008 r13 0xffff80001d79dd90 r14 0x100 r15 0x1 rip 0xffffffff8181e468 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001d79dd70 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=16644 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff80001d718ae0,0xffffffff8283c0a8 process=0xffff8000ffffb938 user=0xffff80001d799000, vmspace=0xfffffd806bc0abb0 estcpu=36, cpticks=2, pctcpu=0.0 user=0, sys=2, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 41212 128217 18379 0 2 0x10 syz-executor.0 *41212 16644 18379 0 7 0x4000010 syz-executor.0 44222 4517 0 0 3 0x14200 bored sosplice 18379 5491 28896 0 3 0x82 nanosleep syz-executor.0 41141 329615 28896 0 3 0x2 biowait syz-executor.1 28896 404319 49756 0 3 0x82 thrsleep syz-fuzzer 28896 56191 49756 0 3 0x4000082 nanosleep syz-fuzzer 28896 38718 49756 0 3 0x4000082 kqread syz-fuzzer 28896 101458 49756 0 3 0x4000082 thrsleep syz-fuzzer 28896 52003 49756 0 3 0x4000082 thrsleep syz-fuzzer 28896 407590 49756 0 3 0x4000082 thrsleep syz-fuzzer 28896 98831 49756 0 3 0x4000082 thrsleep syz-fuzzer 49756 416169 2532 0 3 0x10008a pause ksh 2532 139792 18637 0 3 0x92 select sshd 41620 252306 1 0 3 0x100083 ttyin getty 18637 44213 1 0 3 0x80 select sshd 81738 493847 57804 73 3 0x100090 kqread syslogd 57804 278591 1 0 3 0x100082 netio syslogd 83472 490126 1 77 3 0x100090 poll dhclient 54691 141175 1 0 3 0x80 poll dhclient 79027 72741 0 0 3 0x14200 bored smr 79152 422833 0 0 2 0x14200 zerothread 30978 458195 0 0 3 0x14200 aiodoned aiodoned 57758 36054 0 0 3 0x14200 syncer update 21212 439904 0 0 3 0x14200 cleaner cleaner 98894 298939 0 0 3 0x14200 reaper reaper 33222 74314 0 0 3 0x14200 pgdaemon pagedaemon 67190 447547 0 0 3 0x14200 bored crynlk 44184 100202 0 0 3 0x14200 bored crypto 40140 509372 0 0 3 0x40014200 acpi0 acpi0 13360 486541 0 0 3 0x14200 bored softnet 4292 261775 0 0 3 0x14200 bored systqmp 87655 29191 0 0 3 0x14200 bored systq 67778 244903 0 0 3 0x40014200 bored softclock 4571 483547 0 0 3 0x40014200 idle0 1 467599 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 9469 6330K 6588K 78643K 10779 0 pcb 13 8K 8K 78643K 43 0 rtable 86 3K 7K 78643K 274 0 ifaddr 45 10K 11K 78643K 87 0 counters 20 16K 16K 78643K 25 0 ioctlops 0 0K 4K 78643K 29 0 iov 0 0K 16K 78643K 30 0 mount 1 1K 1K 78643K 1 0 vnodes 1218 77K 77K 78643K 1279 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 3 0 VM map 2 0K 0K 78643K 2 0 sem 11 1K 1K 78643K 21 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 195K 288K 78643K 12938 0 file desc 5 13K 25K 78643K 164 0 sigio 0 0K 0K 78643K 13 0 proc 48 38K 63K 78643K 380 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 11 0 in_multi 22 1K 2K 78643K 44 0 ether_multi 1 0K 0K 78643K 5 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 37 175K 175K 78643K 37 0 exec 0 0K 1K 78643K 214 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 125 39K 39K 78643K 1253 0 UVM aobj 6 2K 2K 78643K 10 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 10 0 NDP 7 0K 0K 78643K 16 0 temp 90 3846K 3911K 78643K 3953 0 kqueue 3 4K 8K 78643K 11 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 arp 64 6 0 2 1 0 1 1 0 8 0 rtpcb 80 123 0 121 1 0 1 1 0 8 0 rtentry 112 45 0 12 2 0 2 2 0 8 0 unpcb 120 85 0 57 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 140 0 140 1 1 0 1 0 8 0 tcpcb 544 67 0 63 1 0 1 1 0 8 0 inpcb 280 241 0 234 2 0 2 2 0 8 1 nd6 48 6 0 3 1 0 1 1 0 8 0 ppxss 1128 1 0 1 1 1 0 1 0 8 0 pfrktable 1344 20 0 20 1 1 0 1 0 8 0 pftag 88 4 0 4 1 1 0 1 0 8 0 pfrule 1360 5 0 5 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 189 0 44 12 1 11 12 0 8 0 art_table 32 190 0 44 2 0 2 2 0 8 0 art_node 16 44 0 14 1 0 1 1 0 8 0 sysvmsgpl 40 14 0 7 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 9 0 0 1 0 1 1 0 8 0 shmpl 112 8 0 4 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1607 0 208 88 0 88 88 0 8 0 ffsino 240 1607 0 208 83 0 83 83 0 8 0 nchpl 144 2012 0 410 60 0 60 60 0 8 0 uvmvnodes 72 1694 0 0 31 0 31 31 0 8 0 vnodes 208 1694 0 0 90 0 90 90 0 8 0 namei 1024 5145 0 5144 1 0 1 1 0 8 0 vcpupl 1984 2 0 0 1 0 1 1 0 8 0 vmpool 528 2 0 0 1 0 1 1 0 8 0 pfiaddrpl 120 6 0 6 1 1 0 1 0 8 0 scxspl 192 6207 0 6206 1 0 1 1 0 8 0 plimitpl 152 20 0 13 1 0 1 1 0 8 0 sigapl 424 351 0 322 4 0 4 4 0 8 0 futexpl 56 2726 0 2726 1 0 1 1 0 8 1 knotepl 112 77 0 58 1 0 1 1 0 8 0 kqueuepl 144 21 0 19 1 0 1 1 0 8 0 pipelkpl 16 91 0 81 1 0 1 1 0 8 0 pipepl 120 182 0 163 1 0 1 1 0 8 0 fdescpl 432 336 0 322 2 0 2 2 0 8 0 filepl 120 1936 0 1822 4 0 4 4 0 8 0 filepl: pool(0xffffffff8281bd40:filepl): free list modified: page 0xfffffd8057c24000; item ordinal 0; addr 0xfffffd8057c24018 (p 0xfffffd8057c24000); offset 0x0=0xeb4457d600000000 lockfpl 104 36 0 34 1 0 1 1 0 8 0 lockfspl 48 15 0 13 1 0 1 1 0 8 0 sessionpl 112 17 0 7 1 0 1 1 0 8 0 pgrppl 48 17 0 7 1 0 1 1 0 8 0 ucredpl 96 153 0 141 1 0 1 1 0 8 0 zombiepl 144 322 0 322 1 0 1 1 0 8 1 processpl 920 351 0 322 4 0 4 4 0 8 0 procpl 624 533 0 497 4 0 4 4 0 8 1 sosppl 128 2 0 2 1 0 1 1 0 8 1 sockpl 400 449 0 412 4 0 4 4 0 8 0 mcl64k 65536 10 0 10 1 0 1 1 0 8 1 mcl16k 16384 2 0 2 2 1 1 1 0 8 1 mcl12k 12288 6 0 6 1 0 1 1 0 8 1 mcl9k 9216 6 0 6 1 0 1 1 0 8 1 mcl8k 8192 2 0 2 1 0 1 1 0 8 1 mcl4k 4096 24 0 24 1 0 1 1 0 8 1 mcl2k 2048 73512 0 73470 13 7 6 12 0 8 0 mtagpl 80 15 0 9 2 1 1 1 0 8 0 mbufpl 256 117373 0 117289 11 4 7 10 0 8 0 bufpl 280 3726 0 125 258 0 258 258 0 8 0 anonpl 16 46633 0 31919 62 1 61 61 0 107 1 amapchunkpl 152 1563 0 1433 8 2 6 8 0 158 0 amappl16 192 1538 0 738 42 0 42 42 0 8 1 amappl15 184 2 0 1 1 0 1 1 0 8 0 amappl14 176 94 0 87 1 0 1 1 0 8 0 amappl13 168 27 0 24 1 0 1 1 0 8 0 amappl12 160 68 0 65 2 1 1 1 0 8 0 amappl11 152 53 0 43 1 0 1 1 0 8 0 amappl10 144 20 0 11 1 0 1 1 0 8 0 amappl9 136 377 0 373 1 0 1 1 0 8 0 amappl8 128 315 0 277 2 0 2 2 0 8 0 amappl7 120 107 0 94 1 0 1 1 0 8 0 amappl6 112 23 0 18 1 0 1 1 0 8 0 amappl5 104 342 0 331 1 0 1 1 0 8 0 amappl4 96 425 0 395 1 0 1 1 0 8 0 amappl3 88 180 0 174 1 0 1 1 0 8 0 amappl2 80 1863 0 1797 2 0 2 2 0 8 0 amappl1 72 15460 0 15038 22 13 9 17 0 8 0 amappl 80 777 0 736 2 0 2 2 0 84 0 dma4096 4096 1 0 1 1 1 0 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 64 9 0 4 1 0 1 1 0 8 0 uaddrrnd 24 338 0 322 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 338 0 322 1 0 1 1 0 8 0 vmmpekpl 168 6271 0 6243 2 0 2 2 0 8 0 vmmpepl 168 47204 0 45305 109 13 96 105 0 357 13 vmsppl 272 337 0 322 3 1 2 2 0 8 1 pdppl 4096 682 0 646 6 1 5 6 0 8 0 pvpl 32 155564 0 137874 149 0 149 149 0 265 5 pmappl 200 337 0 322 1 0 1 1 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 238 0 17 7 0 7 7 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8244f00b) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff8281bd40,9,ffff80001d79df18) at pool_do_get+0x42a sys/kern/subr_pool.c:738 pool_get(ffffffff8281bd40,9) at pool_get+0xb5 sys/kern/subr_pool.c:581 falloc(ffff80001d718600,ffff80001d79dff0,ffff80001d79e020) at falloc+0x103 fnew sys/kern/kern_descrip.c:1048 [inline] falloc(ffff80001d718600,ffff80001d79dff0,ffff80001d79e020) at falloc+0x103 sys/kern/kern_descrip.c:1022 sys_socketpair(ffff80001d718600,ffff80001d79e098,ffff80001d79e0e0) at sys_socketpair+0x1b0 sys/kern/uipc_syscalls.c:452 syscall(ffff80001d79e160) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5b6bdba9e70, count: -8 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8244f00b) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff8281bd40,9,ffff80001d79df18) at pool_do_get+0x42a sys/kern/subr_pool.c:738 pool_get(ffffffff8281bd40,9) at pool_get+0xb5 sys/kern/subr_pool.c:581 falloc(ffff80001d718600,ffff80001d79dff0,ffff80001d79e020) at falloc+0x103 fnew sys/kern/kern_descrip.c:1048 [inline] falloc(ffff80001d718600,ffff80001d79dff0,ffff80001d79e020) at falloc+0x103 sys/kern/kern_descrip.c:1022 sys_socketpair(ffff80001d718600,ffff80001d79e098,ffff80001d79e0e0) at sys_socketpair+0x1b0 sys/kern/uipc_syscalls.c:452 syscall(ffff80001d79e160) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5b6bdba9e70, count: -8