panic: pool_do_get: pvpl free list modified: page 0xfffffd80633f2000; item addr 0xfffffd80633f2000; offset 0x0=0x0 != 0xa15234485aecb76e Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 86878 72601 0 0 0 1K syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82245db4) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff826513e0,2,ffff800023db8dc8) at pool_do_get+0x439 sys/kern/subr_pool.c:738 pool_get(ffffffff826513e0,2) at pool_get+0xeb sys/kern/subr_pool.c:581 pmap_enter(fffffd8065be8cc0,d030fdb4000,77e45000,1,21) at pmap_enter+0x16e udv_fault(ffff800023db9158,d030fdb4000,ffff800023db9050,1,0,0) at udv_fault+0x18b sys/uvm/uvm_device.c:340 uvm_fault(fffffd807f000000,d030fdb4000,0,1) at uvm_fault+0x817 sys/uvm/uvm_fault.c:718 pageflttrap(ffff800023db92f0,1) at pageflttrap+0x1b8 sys/arch/amd64/amd64/trap.c:221 usertrap(ffff800023db92f0) at usertrap+0x21a sys/arch/amd64/amd64/trap.c:384 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7fffff3af0, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic pool_do_get: pvpl free list modified: page 0xfffffd80633f2000; item addr 0xfffffd80633f2000; offset 0x0=0x0 != 0xa15234485aecb76e ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82245db4) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff826513e0,2,ffff800023db8dc8) at pool_do_get+0x439 sys/kern/subr_pool.c:738 pool_get(ffffffff826513e0,2) at pool_get+0xeb sys/kern/subr_pool.c:581 pmap_enter(fffffd8065be8cc0,d030fdb4000,77e45000,1,21) at pmap_enter+0x16e udv_fault(ffff800023db9158,d030fdb4000,ffff800023db9050,1,0,0) at udv_fault+0x18b sys/uvm/uvm_device.c:340 uvm_fault(fffffd807f000000,d030fdb4000,0,1) at uvm_fault+0x817 sys/uvm/uvm_fault.c:718 pageflttrap(ffff800023db92f0,1) at pageflttrap+0x1b8 sys/arch/amd64/amd64/trap.c:221 usertrap(ffff800023db92f0) at usertrap+0x21a sys/arch/amd64/amd64/trap.c:384 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7fffff3af0, count: -10 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800023db8c10 rbx 0xffff800023db8cc0 rdx 0xffff800020ac2768 rcx 0 rax 0 r8 0xffffffff817c547f kprintf+0x16f r9 0x1 r10 0x25 r11 0xd9e823da48ff4a94 r12 0x3000000008 r13 0xffff800023db8c20 r14 0x100 r15 0x1 rip 0xffffffff81136618 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800023db8c00 ss 0 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=86878 stat=onproc flags process=0 proc=0 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020ac3608,0xffff800020ac3af8 process=0xffff800020a90f10 user=0xffff800023db4000, vmspace=0xfffffd807f000000 estcpu=36, cpticks=24, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *72601 86878 64187 0 7 0 syz-executor.0 72601 50198 64187 0 3 0x4000080 fsleep syz-executor.0 82862 50412 48754 0 3 0x90 nanosleep syz-executor.1 82862 299358 48754 0 3 0x4000090 msgwait syz-executor.1 82862 175096 48754 0 3 0x4000090 fsleep syz-executor.1 53846 59320 0 0 3 0x14200 bored sosplice 48754 502125 5716 0 3 0x82 nanosleep syz-executor.1 64187 250029 5716 0 3 0x82 nanosleep syz-executor.0 5716 120506 25490 0 3 0x82 thrsleep syz-fuzzer 5716 128089 25490 0 3 0x4000082 thrsleep syz-fuzzer 5716 164258 25490 0 3 0x4000082 thrsleep syz-fuzzer 5716 422182 25490 0 3 0x4000082 thrsleep syz-fuzzer 5716 507146 25490 0 3 0x4000082 thrsleep syz-fuzzer 5716 98725 25490 0 3 0x4000082 thrsleep syz-fuzzer 5716 509490 25490 0 3 0x4000082 thrsleep syz-fuzzer 5716 13101 25490 0 3 0x4000082 thrsleep syz-fuzzer 5716 49315 25490 0 3 0x4000082 thrsleep syz-fuzzer 5716 365205 25490 0 3 0x4000082 kqread syz-fuzzer 25490 264065 68156 0 3 0x10008a pause ksh 68156 110043 35982 0 3 0x92 select sshd 72891 57665 1 0 3 0x100083 ttyin getty 35982 493264 1 0 3 0x80 select sshd 53969 67734 66656 74 3 0x100092 bpf pflogd 66656 214115 1 0 3 0x80 netio pflogd 22424 135449 15628 73 3 0x100090 kqread syslogd 15628 117188 1 0 3 0x100082 netio syslogd 44295 227443 0 0 3 0x14200 pgzero zerothread 96939 459968 0 0 3 0x14200 aiodoned aiodoned 46832 334339 0 0 3 0x14200 syncer update 36083 228896 0 0 3 0x14200 cleaner cleaner 86187 222318 0 0 3 0x14200 reaper reaper 45313 220570 0 0 3 0x14200 pgdaemon pagedaemon 87667 424927 0 0 3 0x14200 bored crynlk 1687 242671 0 0 3 0x14200 bored crypto 35235 498971 0 0 3 0x40014200 acpi0 acpi0 57275 87680 0 0 3 0x40014200 idle1 61198 170072 0 0 3 0x14200 bored softnet 95654 337462 0 0 3 0x14200 bored systqmp 81780 217551 0 0 3 0x14200 bored systq 2394 158743 0 0 3 0x40014200 bored softclock 79409 341779 0 0 7 0x40014200 idle0 5086 405338 0 0 3 0x14200 bored smr 1 19183 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 1: exclusive mutex pvpl r = 0 (0xffffffff826513f0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 pool_get+0xbf sys/kern/subr_pool.c:578 #4 pmap_enter+0x16e #5 udv_fault+0x18b sys/uvm/uvm_device.c:340 #6 uvm_fault+0x817 sys/uvm/uvm_fault.c:718 #7 pageflttrap+0x1b8 sys/arch/amd64/amd64/trap.c:221 #8 usertrap+0x21a sys/arch/amd64/amd64/trap.c:384 #9 recall_trap+0x8 Process 72601 (syz-executor.0) thread 0xffff800020ac2768 (86878) shared rwlock vmmaplk r = 0 (0xfffffd807f000018) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1448 #2 uvm_fault+0x7f sys/uvm/uvm_fault.c:524 #3 pageflttrap+0x1b8 sys/arch/amd64/amd64/trap.c:221 #4 usertrap+0x21a sys/arch/amd64/amd64/trap.c:384 #5 recall_trap+0x8 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82651860) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 pageflttrap+0x7f sys/arch/amd64/amd64/trap.c:180 #2 usertrap+0x21a sys/arch/amd64/amd64/trap.c:384 #3 recall_trap+0x8 exclusive mutex pvpl r = 0 (0xffffffff826513f0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 pool_get+0xbf sys/kern/subr_pool.c:578 #4 pmap_enter+0x16e #5 udv_fault+0x18b sys/uvm/uvm_device.c:340 #6 uvm_fault+0x817 sys/uvm/uvm_fault.c:718 #7 pageflttrap+0x1b8 sys/arch/amd64/amd64/trap.c:221 #8 usertrap+0x21a sys/arch/amd64/amd64/trap.c:384 #9 recall_trap+0x8 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9559 6612K 6869K 78643K 11566 0 pcb 13 10K 12K 78643K 103 0 rtable 103 4K 4K 78643K 394 0 ifaddr 96 19K 19K 78643K 176 0 counters 43 33K 34K 78643K 69 0 ioctlops 0 0K 4K 78643K 1495 0 iov 0 0K 28K 78643K 85 0 mount 1 1K 1K 78643K 1 0 vnodes 1215 76K 77K 78643K 1537 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 10 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 67 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 6 17K 25K 78643K 410 0 sigio 0 0K 0K 78643K 6 0 proc 56 51K 95K 78643K 470 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 52 0 in_multi 91 4K 4K 78643K 147 0 ether_multi 1 0K 0K 78643K 16 0 mrt 0 0K 0K 78643K 7 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 115 519K 519K 78643K 115 0 exec 0 0K 1K 78643K 244 0 pfkey data 0 0K 1K 78643K 2 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 120 70K 70K 78643K 2400 0 UVM aobj 26 2K 2K 78643K 28 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 68 0 NDP 14 0K 0K 78643K 32 0 temp 138 3018K 3082K 78643K 15257 0 kqueue 4 6K 10K 78643K 25 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 7 0 2 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 212 0 212 1 0 1 1 0 8 1 rtentry 112 56 0 16 2 0 2 2 0 8 0 unpcb 120 633 0 623 2 0 2 2 0 8 1 syncache 264 7 0 7 2 2 0 1 0 8 0 tcpqe 32 37 0 37 1 1 0 1 0 8 0 tcpcb 544 592 0 588 16 15 1 13 0 8 0 inpcb 280 1491 0 1486 11 6 5 9 0 8 4 rttmr 72 2 0 2 2 1 1 1 0 8 1 nd6 48 6 0 2 1 0 1 1 0 8 0 pkpcb 40 5 0 5 2 1 1 1 0 8 1 swfcl 56 1 0 0 1 0 1 1 0 8 0 ppxss 1128 4 0 4 2 1 1 1 0 8 1 pffrag 232 11 0 11 1 0 1 1 0 482 1 pffrnode 88 11 0 11 1 0 1 1 0 8 1 pffrent 40 370 0 370 1 0 1 1 0 8 1 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 46 0 6 1 0 1 1 0 8 0 pfstkey 112 46 0 6 2 0 2 2 0 8 0 pfstate 328 46 0 6 4 0 4 4 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 296 0 93 16 1 15 15 0 8 1 art_table 32 297 0 93 2 0 2 2 0 8 0 art_node 16 54 0 17 1 0 1 1 0 8 0 sysvmsgpl 40 30 0 26 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 61 0 51 1 0 1 1 0 8 0 shmpl 112 26 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2033 0 631 46 0 46 46 0 8 0 ffsino 272 2033 0 631 95 0 95 95 0 8 0 nchpl 144 2825 0 1205 61 0 61 61 0 8 0 uvmvnodes 72 2284 0 0 42 0 42 42 0 8 0 vnodes 208 2284 0 0 121 0 121 121 0 8 0 namei 1024 9296 0 9296 1 0 1 1 0 8 1 percpumem 16 45 0 13 1 0 1 1 0 8 0 vcpupl 1984 6 0 0 1 0 1 1 0 8 0 vmpool 560 12 0 6 1 0 1 1 0 8 0 scxspl 192 8448 0 8448 8 7 1 7 0 8 1 plimitpl 152 56 0 49 1 0 1 1 0 8 0 sigapl 432 609 0 595 3 1 2 3 0 8 0 futexpl 56 11512 0 11510 1 0 1 1 0 8 0 knotepl 112 75 0 55 1 0 1 1 0 8 0 kqueuepl 104 532 0 529 4 3 1 4 0 8 0 pipelkpl 48 177 0 167 1 0 1 1 0 8 0 pipepl 120 354 0 335 2 1 1 2 0 8 0 fdescpl 496 610 0 595 3 0 3 3 0 8 0 filepl 152 6392 0 6295 17 9 8 14 0 8 4 lockfpl 104 94 0 94 1 0 1 1 0 8 1 lockfspl 48 34 0 34 1 0 1 1 0 8 1 sessionpl 112 18 0 9 1 0 1 1 0 8 0 pgrppl 48 26 0 17 1 0 1 1 0 8 0 ucredpl 96 1376 0 1367 1 0 1 1 0 8 0 zombiepl 144 595 0 595 1 0 1 1 0 8 1 processpl 960 626 0 595 5 1 4 5 0 8 0 procpl 624 1590 0 1547 4 0 4 4 0 8 0 sosppl 128 169 0 169 1 0 1 1 0 8 1 sockpl 400 2354 0 2339 23 14 9 14 0 8 7 mcl64k 65536 16 0 0 2 0 2 2 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 8 0 0 1 0 1 1 0 8 0 mcl9k 9216 5 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 12 0 0 2 0 2 2 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 157 0 0 19 0 19 19 0 8 0 mtagpl 80 70 0 0 2 0 2 2 0 8 0 mbufpl 256 590 0 0 37 0 37 37 0 8 0 bufpl 280 5101 0 197 351 0 351 351 0 8 0 anonpl 16 67889 0 50621 73 1 72 72 0 125 1 amapchunkpl 152 3451 0 3316 9 1 8 8 0 158 1 amappl16 192 2834 0 1852 51 1 50 50 0 8 0 amappl15 184 58 0 55 1 0 1 1 0 8 0 amappl14 176 32 0 29 1 0 1 1 0 8 0 amappl13 168 1 0 0 1 0 1 1 0 8 0 amappl12 160 193 0 191 2 1 1 1 0 8 0 amappl11 152 246 0 236 1 0 1 1 0 8 0 amappl10 144 24 0 19 1 0 1 1 0 8 0 amappl9 136 600 0 597 1 0 1 1 0 8 0 amappl8 128 120 0 100 1 0 1 1 0 8 0 amappl7 120 102 0 91 1 0 1 1 0 8 0 amappl6 112 252 0 240 1 0 1 1 0 8 0 amappl5 104 328 0 316 1 0 1 1 0 8 0 amappl4 96 864 0 836 1 0 1 1 0 8 0 amappl3 88 135 0 127 1 0 1 1 0 8 0 amappl2 80 4010 0 3935 3 1 2 3 0 8 0 amappl1 72 23556 0 23121 25 15 10 20 0 8 0 amappl 80 1855 0 1808 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 27 0 2 1 0 1 1 0 8 0 uaddrrnd 24 622 0 601 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 622 0 601 1 0 1 1 0 8 0 vmmpekpl 168 8620 0 8578 2 0 2 2 0 8 0 vmmpepl 168 81608 0 79418 120 19 101 118 0 357 5 vmsppl 368 621 0 601 2 0 2 2 0 8 0 pdppl 4096 1251 0 1208 7 1 6 6 0 8 0 pvpl 32 225618 0 204971 174 0 174 174 0 265 7 pvpl: pool(0xffffffff826513e0:pvpl): free list modified: page 0xfffffd80633f2000; item ordinal 0; addr 0xfffffd80633f2000 (p 0xfffffd80633f2000); offset 0x0=0x0 pool(pvpl): free list modified: page 0xfffffd80633f2000; item ordinal 0; addr 0xfffffd80633f2000 (p 0xfffffd80633f2000); offset 0x0=0x0 pvpl: pool(0xffffffff826513e0:pvpl): page inconsistency: page 0xfffffd80633f2000; item ordinal 1; addr 0x78387fd30b6462aa pmappl 232 621 0 601 3 1 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 234 0 34 6 0 6 6 0 8 0