panic: pool_do_get: pvpl free list modified: page 0xfffffd8061f27000; item addr 0xfffffd8061f27000; offset 0x0=0x7002c90000000000 != 0x7002c9214955947e Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 286215 67977 0 0 0 1 syz-executor.1 *168108 253 0 0 0 0K syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8223bd92) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff82647968,2,ffff8000247aca28) at pool_do_get+0x439 sys/kern/subr_pool.c:746 pool_get(ffffffff82647968,2) at pool_get+0xeb sys/kern/subr_pool.c:581 pmap_enter(fffffd807f004bc8,e7d909f4000,7cfb0000,1,21) at pmap_enter+0x16e udv_fault(ffff8000247acdb8,e7d909f4000,ffff8000247accb0,1,0,0) at udv_fault+0x18b sys/uvm/uvm_device.c:340 uvm_fault(fffffd807f005a10,e7d909f4000,0,1) at uvm_fault+0x817 sys/uvm/uvm_fault.c:718 pageflttrap(ffff8000247acf50,1) at pageflttrap+0x20b sys/arch/amd64/amd64/trap.c:199 usertrap(ffff8000247acf50) at usertrap+0x21a sys/arch/amd64/amd64/trap.c:369 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffce0b0, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic pool_do_get: pvpl free list modified: page 0xfffffd8061f27000; item addr 0xfffffd8061f27000; offset 0x0=0x7002c90000000000 != 0x7002c9214955947e ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8223bd92) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff82647968,2,ffff8000247aca28) at pool_do_get+0x439 sys/kern/subr_pool.c:746 pool_get(ffffffff82647968,2) at pool_get+0xeb sys/kern/subr_pool.c:581 pmap_enter(fffffd807f004bc8,e7d909f4000,7cfb0000,1,21) at pmap_enter+0x16e udv_fault(ffff8000247acdb8,e7d909f4000,ffff8000247accb0,1,0,0) at udv_fault+0x18b sys/uvm/uvm_device.c:340 uvm_fault(fffffd807f005a10,e7d909f4000,0,1) at uvm_fault+0x817 sys/uvm/uvm_fault.c:718 pageflttrap(ffff8000247acf50,1) at pageflttrap+0x20b sys/arch/amd64/amd64/trap.c:199 usertrap(ffff8000247acf50) at usertrap+0x21a sys/arch/amd64/amd64/trap.c:369 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffce0b0, count: -10 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff8000247ac870 rbx 0xffff8000247ac920 rdx 0xffff800020aa1b48 rcx 0 rax 0 r8 0xffffffff81400edf kprintf+0x16f r9 0x1 r10 0x25 r11 0x5e7ec4329a6a2627 r12 0x3000000008 r13 0xffff8000247ac880 r14 0x100 r15 0x1 rip 0xffffffff815de968 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000247ac860 ss 0 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=168108 stat=onproc flags process=0 proc=0 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020a989f8,0xffff800020aa0798 process=0xffff800020a9b8c8 user=0xffff8000247a8000, vmspace=0xfffffd807f005a10 estcpu=36, cpticks=3, pctcpu=0.0 user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 67977 286215 19416 0 7 0 syz-executor.1 * 253 168108 84186 0 7 0 syz-executor.0 253 190249 84186 0 3 0x4000080 fsleep syz-executor.0 19416 126149 24651 0 3 0x82 nanosleep syz-executor.1 84186 10509 24651 0 3 0x82 nanosleep syz-executor.0 24651 285966 93596 0 3 0x82 kqread syz-fuzzer 24651 387717 93596 0 3 0x4000082 nanosleep syz-fuzzer 24651 19455 93596 0 3 0x4000082 thrsleep syz-fuzzer 24651 82264 93596 0 3 0x4000082 thrsleep syz-fuzzer 24651 304262 93596 0 3 0x4000082 thrsleep syz-fuzzer 24651 87447 93596 0 3 0x4000082 thrsleep syz-fuzzer 24651 356134 93596 0 3 0x4000082 thrsleep syz-fuzzer 24651 147308 93596 0 3 0x4000082 thrsleep syz-fuzzer 24651 115906 93596 0 3 0x4000082 thrsleep syz-fuzzer 24651 147309 93596 0 3 0x4000082 thrsleep syz-fuzzer 93596 36448 56360 0 3 0x10008a pause ksh 56360 118627 31482 0 3 0x92 select sshd 7618 87423 1 0 3 0x100083 ttyin getty 31482 2650 1 0 3 0x80 select sshd 63070 191156 88465 74 3 0x100092 bpf pflogd 88465 391992 1 0 3 0x80 netio pflogd 89471 5860 56994 73 3 0x100090 kqread syslogd 56994 185940 1 0 3 0x100082 netio syslogd 11945 297756 1 77 3 0x100090 poll dhclient 77203 185053 1 0 3 0x80 poll dhclient 56013 283910 0 0 3 0x14200 pgzero zerothread 57291 171927 0 0 3 0x14200 aiodoned aiodoned 8445 424984 0 0 3 0x14200 syncer update 80528 114178 0 0 3 0x14200 cleaner cleaner 93296 9765 0 0 3 0x14200 reaper reaper 40028 181700 0 0 3 0x14200 pgdaemon pagedaemon 15126 92325 0 0 3 0x14200 bored crynlk 23578 359747 0 0 3 0x14200 bored crypto 15484 62902 0 0 3 0x14200 bored viomb 15329 196000 0 0 3 0x40014200 acpi0 acpi0 57244 139584 0 0 3 0x40014200 idle1 44567 70610 0 0 3 0x14200 bored softnet 56651 185422 0 0 3 0x14200 bored systqmp 36170 358 0 0 3 0x14200 bored systq 55626 313536 0 0 3 0x40014200 bored softclock 4068 232114 0 0 3 0x40014200 idle0 81121 9689 0 0 3 0x14200 bored smr 1 382832 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex pvpl r = 0 (0xffffffff82647978) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #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+0x20b sys/arch/amd64/amd64/trap.c:199 #8 usertrap+0x21a sys/arch/amd64/amd64/trap.c:369 #9 recall_trap+0x8 Process 253 (syz-executor.0) thread 0xffff800020aa1b48 (168108) shared rwlock vmmaplk r = 0 (0xfffffd807f005a28) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1448 #2 uvm_fault+0x7f sys/uvm/uvm_fault.c:524 #3 pageflttrap+0x20b sys/arch/amd64/amd64/trap.c:199 #4 usertrap+0x21a sys/arch/amd64/amd64/trap.c:369 #5 recall_trap+0x8 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8265cfc8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 pageflttrap+0x6f sys/arch/amd64/amd64/trap.c:162 #2 usertrap+0x21a sys/arch/amd64/amd64/trap.c:369 #3 recall_trap+0x8 exclusive mutex pvpl r = 0 (0xffffffff82647978) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #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+0x20b sys/arch/amd64/amd64/trap.c:199 #8 usertrap+0x21a sys/arch/amd64/amd64/trap.c:369 #9 recall_trap+0x8 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9527 6674K 7059K 78643K 10876 0 pcb 13 8K 8K 78643K 54 0 rtable 89 11K 12K 78643K 268 0 ifaddr 56 11K 13K 78643K 77 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 4K 78643K 1469 0 iov 0 0K 12K 78643K 69 0 mount 1 1K 1K 78643K 1 0 vnodes 1225 77K 77K 78643K 1303 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 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 22 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1810 197K 290K 78643K 12817 0 file desc 6 17K 25K 78643K 104 0 proc 60 63K 95K 78643K 452 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 38 2K 2K 78643K 47 0 ether_multi 1 0K 0K 78643K 1 0 mrt 0 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 60 265K 265K 78643K 60 0 exec 0 0K 1K 78643K 211 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 113 22K 24K 78643K 1291 0 UVM aobj 18 2K 2K 78643K 18 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 16 0 NDP 9 0K 0K 78643K 15 0 temp 103 3025K 3089K 78643K 3736 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 9 0 5 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 21 0 19 1 0 1 1 0 8 0 rtentry 112 53 0 20 2 0 2 2 0 8 0 unpcb 120 89 0 79 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 57 0 57 1 0 1 1 0 8 1 tcpcb 544 35 0 31 1 0 1 1 0 8 0 inpcb 280 177 0 169 2 0 2 2 0 8 1 nd6 48 4 0 2 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 ppxss 1128 2 0 2 1 0 1 1 0 8 1 pffrag 232 1 0 1 1 0 1 1 0 482 1 pffrnode 88 1 0 1 1 0 1 1 0 8 1 pffrent 40 45 0 45 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 14 0 0 1 0 1 1 0 8 0 pfstkey 112 14 0 0 1 0 1 1 0 8 0 pfstate 328 14 0 0 2 0 2 2 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 256 227 0 59 15 0 15 15 0 8 1 art_table 32 228 0 59 2 0 2 2 0 8 0 art_node 16 52 0 23 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 0 1 0 1 1 0 8 0 semupl 112 2 0 2 1 0 1 1 0 8 1 semapl 112 20 0 10 1 0 1 1 0 8 0 shmpl 112 16 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1552 0 142 46 0 46 46 0 8 0 ffsino 272 1552 0 142 95 0 95 95 0 8 0 nchpl 144 1906 0 288 61 0 61 61 0 8 0 uvmvnodes 72 1660 0 0 31 0 31 31 0 8 0 vnodes 208 1660 0 0 88 0 88 88 0 8 0 namei 1024 5192 0 5192 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 5410 0 5410 4 1 3 3 0 8 3 plimitpl 152 21 0 13 1 0 1 1 0 8 0 sigapl 432 303 0 287 3 0 3 3 0 8 1 futexpl 56 1908 0 1907 1 0 1 1 0 8 0 knotepl 112 74 0 55 1 0 1 1 0 8 0 kqueuepl 104 30 0 28 1 0 1 1 0 8 0 pipepl 160 200 0 181 2 0 2 2 0 8 1 fdescpl 488 304 0 287 3 0 3 3 0 8 0 filepl 152 1968 0 1866 6 0 6 6 0 8 2 lockfpl 104 82 0 80 1 0 1 1 0 8 0 lockfspl 48 22 0 20 1 0 1 1 0 8 0 sessionpl 112 18 0 7 1 0 1 1 0 8 0 pgrppl 48 20 0 9 1 0 1 1 0 8 0 ucredpl 96 218 0 209 1 0 1 1 0 8 0 zombiepl 144 287 0 287 1 0 1 1 0 8 1 processpl 904 320 0 287 4 0 4 4 0 8 0 procpl 632 516 0 473 5 0 5 5 0 8 0 srpgc 64 2 0 2 1 0 1 1 0 8 1 sockpl 384 291 0 271 4 0 4 4 0 8 2 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 205 0 0 25 0 25 25 0 8 0 mtagpl 80 24 0 0 1 0 1 1 0 8 0 mbufpl 256 475 0 0 30 0 30 30 0 8 0 bufpl 280 6673 0 1340 381 0 381 381 0 8 0 anonpl 16 48121 0 28448 81 1 80 80 0 125 0 amapchunkpl 152 1661 0 1509 13 0 13 13 0 158 6 amappl16 192 1440 0 360 55 0 55 55 0 8 1 amappl15 184 123 0 115 1 0 1 1 0 8 0 amappl14 176 66 0 63 1 0 1 1 0 8 0 amappl12 160 13 0 12 1 0 1 1 0 8 0 amappl11 152 60 0 45 1 0 1 1 0 8 0 amappl10 144 14 0 11 1 0 1 1 0 8 0 amappl9 136 604 0 600 1 0 1 1 0 8 0 amappl8 128 133 0 107 1 0 1 1 0 8 0 amappl7 120 101 0 90 1 0 1 1 0 8 0 amappl6 112 58 0 53 1 0 1 1 0 8 0 amappl5 104 136 0 120 1 0 1 1 0 8 0 amappl4 96 561 0 524 2 1 1 2 0 8 0 amappl3 88 152 0 144 1 0 1 1 0 8 0 amappl2 80 1537 0 1458 3 1 2 3 0 8 0 amappl1 72 16782 0 16324 26 12 14 21 0 8 4 amappl 80 772 0 724 2 0 2 2 0 84 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 64 17 0 0 1 0 1 1 0 8 0 uaddrrnd 24 304 0 287 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 304 0 287 1 0 1 1 0 8 0 vmmpekpl 168 6262 0 6227 3 1 2 2 0 8 0 vmmpepl 168 45255 0 42910 134 4 130 130 0 357 28 vmsppl 368 303 0 287 2 0 2 2 0 8 0 pdppl 4096 615 0 574 6 0 6 6 0 8 0 pvpl 32 156650 0 133721 192 0 192 192 0 265 7 pvpl: pool(0xffffffff82647968:pvpl): free list modified: page 0xfffffd8061f27000; item ordinal 0; addr 0xfffffd8061f27000 (p 0xfffffd8061f27000); offset 0x0=0x7002c90000000000 pmappl 232 303 0 287 2 0 2 2 0 8 1 extentpl 40 50 0 32 1 0 1 1 0 8 0 phpool 112 191 0 3 6 0 6 6 0 8 0