panic: pool_do_get: pvpl free list modified: page 0xfffffd8057bf7000; item addr 0xfffffd8057bf7010; offset 0x0=0x0 != 0xcafc4c00c699c8f Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *123589 77051 0 0x10 0 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82225777) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff8256d760,2,ffff80001d43c5c8) at pool_do_get+0x42a sys/kern/subr_pool.c:738 pool_get(ffffffff8256d760,2) at pool_get+0xb5 sys/kern/subr_pool.c:581 pmap_enter(fffffd806bc09320,b26c73e000,676e5000,1,21) at pmap_enter+0x160 udv_fault(ffff80001d43c970,b26c73e000,ffff80001d43c870,1,0,0) at udv_fault+0x18b sys/uvm/uvm_device.c:340 uvm_fault(fffffd806bc0add0,b26c73e000,0,1) at uvm_fault+0x81e sys/uvm/uvm_fault.c:718 pageflttrap(ffff80001d43cb00,1) at pageflttrap+0x156 sys/arch/amd64/amd64/trap.c:221 usertrap(ffff80001d43cb00) at usertrap+0x1fb sys/arch/amd64/amd64/trap.c:384 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffe0870, count: 5 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: pvpl free list modified: page 0xfffffd8057bf7000; item addr 0xfffffd8057bf7010; offset 0x0=0x0 != 0xcafc4c00c699c8f ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82225777) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff8256d760,2,ffff80001d43c5c8) at pool_do_get+0x42a sys/kern/subr_pool.c:738 pool_get(ffffffff8256d760,2) at pool_get+0xb5 sys/kern/subr_pool.c:581 pmap_enter(fffffd806bc09320,b26c73e000,676e5000,1,21) at pmap_enter+0x160 udv_fault(ffff80001d43c970,b26c73e000,ffff80001d43c870,1,0,0) at udv_fault+0x18b sys/uvm/uvm_device.c:340 uvm_fault(fffffd806bc0add0,b26c73e000,0,1) at uvm_fault+0x81e sys/uvm/uvm_fault.c:718 pageflttrap(ffff80001d43cb00,1) at pageflttrap+0x156 sys/arch/amd64/amd64/trap.c:221 usertrap(ffff80001d43cb00) at usertrap+0x1fb sys/arch/amd64/amd64/trap.c:384 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffe0870, count: -10 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80001d43c430 rbx 0xffff80001d43c4e0 rdx 0x2 rcx 0 rax 0 r8 0xffff80001d43c3f0 r9 0x1 r10 0 r11 0x1621471c9ffe089f r12 0x3000000008 r13 0xffff80001d43c440 r14 0x100 r15 0x1 rip 0xffffffff813bb9a8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001d43c420 ss 0 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=123589 stat=onproc flags process=10 proc=0 pri=32, usrpri=75, nice=20 forw=0xffffffffffffffff, list=0xffff80001d36eae8,0xffff80001d36e888 process=0xffff8000ffffb890 user=0xffff80001d437000, vmspace=0xfffffd806bc0add0 estcpu=25, cpticks=2, pctcpu=0.1 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 95565 253814 43085 0 2 0x480 syz-executor.1 95565 252047 43085 0 3 0x4000080 msgwait syz-executor.1 *77051 123589 76877 0 7 0x10 syz-executor.0 77051 193418 76877 0 3 0x4000090 fsleep syz-executor.0 77051 355128 76877 0 3 0x4000090 fsleep syz-executor.0 55265 43486 0 0 3 0x14200 bored sosplice 76877 111907 97019 0 3 0x82 nanosleep syz-executor.0 43085 268622 97019 0 3 0x82 nanosleep syz-executor.1 97019 261145 23759 0 3 0x82 thrsleep syz-fuzzer 97019 443556 23759 0 3 0x4000082 thrsleep syz-fuzzer 97019 510284 23759 0 3 0x4000082 thrsleep syz-fuzzer 97019 195366 23759 0 3 0x4000082 thrsleep syz-fuzzer 97019 164622 23759 0 3 0x4000082 thrsleep syz-fuzzer 97019 485485 23759 0 3 0x4000082 thrsleep syz-fuzzer 97019 414657 23759 0 3 0x4000082 thrsleep syz-fuzzer 97019 79443 23759 0 3 0x4000082 kqread syz-fuzzer 23759 333392 81237 0 3 0x10008a pause ksh 81237 111287 11449 0 3 0x92 select sshd 55228 88879 1 0 3 0x100083 ttyin getty 11449 368083 1 0 3 0x80 select sshd 39987 433975 25222 73 3 0x100090 kqread syslogd 25222 518757 1 0 3 0x100082 netio syslogd 96777 47208 1 77 3 0x100090 poll dhclient 44640 108443 1 0 3 0x80 poll dhclient 40971 100319 0 0 3 0x14200 pgzero zerothread 94251 148330 0 0 3 0x14200 aiodoned aiodoned 61219 86090 0 0 3 0x14200 syncer update 13543 301186 0 0 3 0x14200 cleaner cleaner 86622 427338 0 0 3 0x14200 reaper reaper 64186 233586 0 0 3 0x14200 pgdaemon pagedaemon 47369 280590 0 0 3 0x14200 bored crynlk 40423 389415 0 0 3 0x14200 bored crypto 54441 457114 0 0 3 0x40014200 acpi0 acpi0 47868 470924 0 0 3 0x14200 bored softnet 44450 131000 0 0 3 0x14200 bored systqmp 22625 224626 0 0 3 0x14200 bored systq 86521 89622 0 0 3 0x40014200 bored softclock 53631 289870 0 0 3 0x40014200 idle0 18264 258040 0 0 3 0x14200 bored smr 1 459254 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 9450 6332K 6582K 78643K 10581 0 pcb 13 8K 8K 78643K 27 0 rtable 105 3K 3K 78643K 191 0 ifaddr 39 10K 10K 78643K 41 0 counters 21 16K 16K 78643K 21 0 ioctlops 0 0K 2K 78643K 19 0 mount 1 1K 1K 78643K 1 0 vnodes 1216 76K 76K 78643K 1227 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 0K 0K 78643K 2 0 sem 4 0K 0K 78643K 4 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 6 17K 25K 78643K 68 0 proc 48 38K 63K 78643K 364 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 14 0 in_multi 33 2K 2K 78643K 33 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 31 148K 148K 78643K 31 0 exec 0 0K 1K 78643K 181 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 104 21K 37K 78643K 996 0 UVM aobj 13 2K 2K 78643K 13 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 4 0 NDP 5 0K 0K 78643K 9 0 temp 80 3008K 3072K 78643K 1922 0 kqueue 3 4K 9K 78643K 10 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 0 1 0 1 1 0 8 0 rtpcb 80 21 0 19 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 23 0 15 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 38 0 38 1 1 0 1 0 8 0 tcpcb 544 24 0 20 1 0 1 1 0 8 0 inpcb 280 84 0 76 2 0 2 2 0 8 1 nd6 48 4 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 212 0 0 14 0 14 14 0 8 0 art_table 32 213 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 sysvmsgpl 40 17 0 16 1 0 1 1 0 8 0 semapl 112 2 0 0 1 0 1 1 0 8 0 shmpl 112 11 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1470 0 69 46 0 46 46 0 8 0 ffsino 240 1470 0 69 83 0 83 83 0 8 0 nchpl 144 1756 0 145 60 0 60 60 0 8 0 uvmvnodes 72 1521 0 0 28 0 28 28 0 8 0 vnodes 208 1521 0 0 81 0 81 81 0 8 0 namei 1024 4270 0 4270 1 0 1 1 0 8 1 vmpool 528 2 0 2 1 1 0 1 0 8 0 scxspl 192 5078 0 5078 1 0 1 1 0 8 1 plimitpl 152 18 0 11 1 0 1 1 0 8 0 sigapl 432 239 0 225 2 0 2 2 0 8 0 futexpl 56 880 0 878 1 0 1 1 0 8 0 knotepl 112 59 0 40 1 0 1 1 0 8 0 kqueuepl 104 42 0 39 1 0 1 1 0 8 0 pipelkpl 16 91 0 80 1 0 1 1 0 8 0 pipepl 120 182 0 161 2 1 1 2 0 8 0 fdescpl 432 240 0 225 2 0 2 2 0 8 0 filepl 120 1324 0 1220 4 0 4 4 0 8 0 lockfpl 104 10 0 9 1 0 1 1 0 8 0 lockfspl 48 5 0 4 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 60 0 51 1 0 1 1 0 8 0 zombiepl 144 225 0 225 1 0 1 1 0 8 1 processpl 896 255 0 225 4 0 4 4 0 8 0 procpl 624 312 0 272 4 0 4 4 0 8 0 sosppl 128 3 0 3 1 0 1 1 0 8 1 sockpl 400 128 0 110 3 0 3 3 0 8 1 mcl12k 12288 2 0 2 1 0 1 1 0 8 1 mcl8k 8192 2 0 2 1 1 0 1 0 8 0 mcl4k 4096 13 0 13 1 0 1 1 0 8 1 mcl2k 2048 63241 0 63203 12 3 9 11 0 8 3 mtagpl 80 6 0 2 2 1 1 1 0 8 0 mbufpl 256 100109 0 99963 12 2 10 10 0 8 0 bufpl 280 4066 0 179 278 0 278 278 0 8 0 anonpl 16 37241 0 22353 61 1 60 60 0 107 0 amapchunkpl 152 1094 0 963 8 2 6 8 0 158 0 amappl16 192 1025 0 205 41 0 41 41 0 8 0 amappl15 184 52 0 47 1 0 1 1 0 8 0 amappl14 176 42 0 39 1 0 1 1 0 8 0 amappl13 168 1 0 1 1 1 0 1 0 8 0 amappl12 160 2 0 2 1 1 0 1 0 8 0 amappl11 152 63 0 50 1 0 1 1 0 8 0 amappl10 144 16 0 12 1 0 1 1 0 8 0 amappl9 136 557 0 554 1 0 1 1 0 8 0 amappl8 128 104 0 87 1 0 1 1 0 8 0 amappl7 120 90 0 80 1 0 1 1 0 8 0 amappl6 112 73 0 64 1 0 1 1 0 8 0 amappl5 104 139 0 130 1 0 1 1 0 8 0 amappl4 96 429 0 404 1 0 1 1 0 8 0 amappl3 88 153 0 140 1 0 1 1 0 8 0 amappl2 80 1137 0 1060 3 1 2 3 0 8 0 amappl1 72 13972 0 13516 26 14 12 20 0 8 2 amappl 80 529 0 486 1 0 1 1 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 12 0 0 1 0 1 1 0 8 0 uaddrrnd 24 242 0 227 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 242 0 227 1 0 1 1 0 8 0 vmmpekpl 168 5848 0 5824 2 0 2 2 0 8 0 vmmpepl 168 36568 0 34538 115 8 107 109 0 357 18 vmsppl 272 241 0 227 2 1 1 2 0 8 0 pdppl 4096 490 0 454 6 1 5 6 0 8 0 pvpl 32 131611 0 113445 147 0 147 147 0 265 0 pvpl: pool(0xffffffff8256d760:pvpl): free list modified: page 0xfffffd8057bf7000; item ordinal 0; addr 0xfffffd8057bf7010 (p 0xfffffd8057bf7000); offset 0x0=0x0 pvpl: pool(0xffffffff8256d760:pvpl): page inconsistency: page 0xfffffd8057bf7000; item ordinal 1; addr 0xffd342446256f30c pmappl 200 241 0 227 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 146 0 10 5 0 5 5 0 8 0