panic: pool_do_get: pvpl free list modified: page 0xfffffd8065a3f000; item addr 0xfffffd8065a3f000; offset 0x0=0x0 != 0xe4c2915fa0078d1b Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *128005 11958 0 0 0x4000000 0K syz-executor.1 156878 868 0 0x2 0x480 1 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8224681f) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff82645a88,2,ffff800021bc7548) at pool_do_get+0x439 sys/kern/subr_pool.c:746 pool_get(ffffffff82645a88,2) at pool_get+0xeb sys/kern/subr_pool.c:581 pmap_enter(fffffd8066d8dbd0,20881000,64ba9000,3,21) at pmap_enter+0x16e uvm_fault(fffffd807f000cf0,20881000,0,1) at uvm_fault+0x10f0 sys/uvm/uvm_fault.c:1217 pageflttrap(ffff800021bc79b0,0) at pageflttrap+0x1b8 sys/arch/amd64/amd64/trap.c:221 kerntrap(ffff800021bc79b0) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:302 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x4b syscall(ffff800021bc7d00) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800021bc7d00) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xea54b781210, count: 3 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 0xfffffd8065a3f000; item addr 0xfffffd8065a3f000; offset 0x0=0x0 != 0xe4c2915fa0078d1b ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8224681f) at panic+0x15c sys/kern/subr_prf.c:207 pool_do_get(ffffffff82645a88,2,ffff800021bc7548) at pool_do_get+0x439 sys/kern/subr_pool.c:746 pool_get(ffffffff82645a88,2) at pool_get+0xeb sys/kern/subr_pool.c:581 pmap_enter(fffffd8066d8dbd0,20881000,64ba9000,3,21) at pmap_enter+0x16e uvm_fault(fffffd807f000cf0,20881000,0,1) at uvm_fault+0x10f0 sys/uvm/uvm_fault.c:1217 pageflttrap(ffff800021bc79b0,0) at pageflttrap+0x1b8 sys/arch/amd64/amd64/trap.c:221 kerntrap(ffff800021bc79b0) at kerntrap+0xec sys/arch/amd64/amd64/trap.c:302 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x4b syscall(ffff800021bc7d00) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800021bc7d00) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xea54b781210, count: -12 ddb{0}> show registers rdi 0 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800021bc7390 rbx 0xffff800021bc7440 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800022d9c000 rax 0xffff800000a4fac0 r8 0xffffffff816b7fbf kprintf+0x16f r9 0x1 r10 0x25 r11 0xc4e04e9994bb28cb r12 0x3000000008 r13 0xffff800021bc73a0 r14 0x100 r15 0x1 rip 0xffffffff81429ef8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021bc7380 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=128005 stat=onproc flags process=0 proc=4000000 pri=69, usrpri=69, nice=20 forw=0xffffffffffffffff, list=0xffff800020ac8780,0xffffffff82640d40 process=0xffff800020a63508 user=0xffff800021bc2000, vmspace=0xfffffd807f000cf0 estcpu=19, cpticks=51, pctcpu=0.46 user=0, sys=97, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 11958 312939 22951 0 2 0 syz-executor.1 *11958 128005 22951 0 7 0x4000000 syz-executor.1 79939 456229 0 0 3 0x14200 bored sosplice 22951 286849 57772 0 2 0x482 syz-executor.1 38952 366647 0 0 3 0x14200 acct acct 868 156878 57772 0 7 0x482 syz-executor.0 57772 345936 49585 0 3 0x82 thrsleep syz-fuzzer 57772 350930 49585 0 2 0x4000482 syz-fuzzer 57772 93835 49585 0 3 0x4000082 thrsleep syz-fuzzer 57772 113631 49585 0 3 0x4000082 thrsleep syz-fuzzer 57772 83655 49585 0 3 0x4000082 thrsleep syz-fuzzer 57772 480900 49585 0 2 0x4000482 syz-fuzzer 57772 54091 49585 0 3 0x4000082 thrsleep syz-fuzzer 57772 423603 49585 0 3 0x4000082 kqread syz-fuzzer 57772 395332 49585 0 3 0x4000082 thrsleep syz-fuzzer 57772 124717 49585 0 2 0x4000482 syz-fuzzer 49585 218505 62327 0 3 0x10008a pause ksh 62327 395084 83805 0 3 0x92 select sshd 18974 516449 1 0 3 0x100083 ttyin getty 83805 94285 1 0 3 0x80 select sshd 76608 428302 1793 74 2 0x100492 pflogd 1793 401276 1 0 3 0x80 netio pflogd 86715 449412 92182 73 3 0x100090 kqread syslogd 92182 212030 1 0 3 0x100082 netio syslogd 25410 511181 1 77 3 0x100090 poll dhclient 45018 211873 1 0 3 0x80 poll dhclient 30126 165040 0 0 2 0x14200 zerothread 99542 13877 0 0 3 0x14200 aiodoned aiodoned 3633 161152 0 0 2 0x14200 update 30982 214151 0 0 3 0x14200 cleaner cleaner 53829 20765 0 0 3 0x14200 reaper reaper 31860 345923 0 0 3 0x14200 pgdaemon pagedaemon 36979 282232 0 0 3 0x14200 bored crynlk 82357 338938 0 0 3 0x14200 bored crypto 98413 241441 0 0 3 0x40014200 acpi0 acpi0 72194 375060 0 0 3 0x40014200 idle1 35672 274762 0 0 2 0x14200 softnet 13082 94693 0 0 2 0x14200 systqmp 53719 368793 0 0 3 0x14200 bored systq 88504 359551 0 0 2 0x40014200 softclock 81039 413348 0 0 3 0x40014200 idle0 633 162738 0 0 2 0x14200 smr 1 349541 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 (0xffffffff82645a98) #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 uvm_fault+0x10f0 sys/uvm/uvm_fault.c:1217 #6 pageflttrap+0x1b8 sys/arch/amd64/amd64/trap.c:221 #7 kerntrap+0xec sys/arch/amd64/amd64/trap.c:302 #8 alltraps_kern_meltdown+0x7b #9 copyin+0x4b #10 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #10 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #11 Xsyscall+0x128 Process 11958 (syz-executor.1) thread 0xffff800020ac89f8 (128005) shared rwlock vmmaplk r = 0 (0xfffffd807f000d08) #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+0x1b8 sys/arch/amd64/amd64/trap.c:221 #4 kerntrap+0xec sys/arch/amd64/amd64/trap.c:302 #5 alltraps_kern_meltdown+0x7b #6 copyin+0x4b #7 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #7 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #8 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 1 (0xffffffff82663c50) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 syscall+0x400 mi_syscall sys/sys/syscall_mi.h:83 [inline] #1 syscall+0x400 sys/arch/amd64/amd64/trap.c:570 #2 Xsyscall+0x128 exclusive mutex pvpl r = 0 (0xffffffff82645a98) #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 uvm_fault+0x10f0 sys/uvm/uvm_fault.c:1217 #6 pageflttrap+0x1b8 sys/arch/amd64/amd64/trap.c:221 #7 kerntrap+0xec sys/arch/amd64/amd64/trap.c:302 #8 alltraps_kern_meltdown+0x7b #9 copyin+0x4b #10 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #10 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #11 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9555 6764K 7446K 78643K 11448 0 pcb 13 8K 8K 78643K 49 0 rtable 108 4K 4K 78643K 331 0 ifaddr 71 14K 14K 78643K 130 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 4K 78643K 1480 0 iov 0 0K 16K 78643K 52 0 mount 1 1K 1K 78643K 1 0 vnodes 1225 77K 77K 78643K 1480 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 6 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 99 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 5 13K 25K 78643K 208 0 sigio 0 0K 0K 78643K 5 0 proc 61 63K 95K 78643K 486 0 subproc 32 2K 2K 78643K 51 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 26 0 in_multi 40 2K 2K 78643K 74 0 ether_multi 1 0K 0K 78643K 6 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 55 254K 254K 78643K 55 0 exec 0 0K 1K 78643K 229 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 109 37K 40K 78643K 1675 0 UVM aobj 14 2K 2K 78643K 14 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 22 0 NDP 12 0K 0K 78643K 27 0 temp 118 3015K 3079K 78643K 11285 0 kqueue 3 4K 26K 78643K 26 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 3 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 51 0 49 1 0 1 1 0 8 0 rtentry 112 60 0 16 2 0 2 2 0 8 0 unpcb 120 125 0 115 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 32 0 32 1 1 0 1 0 8 0 tcpcb 544 81 0 77 1 0 1 1 0 8 0 inpcb 280 404 0 397 2 0 2 2 0 8 1 nd6 48 6 0 2 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 ppxss 1128 6 0 6 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 29 0 2 1 0 1 1 0 8 0 pfstkey 112 29 0 2 1 0 1 1 0 8 0 pfstate 328 29 0 2 3 0 3 3 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 256 264 0 51 14 0 14 14 0 8 0 art_table 32 265 0 51 2 0 2 2 0 8 0 art_node 16 59 0 19 1 0 1 1 0 8 0 sysvmsgpl 40 50 0 35 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 97 0 87 1 0 1 1 0 8 0 shmpl 112 12 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1712 0 304 46 0 46 46 0 8 0 ffsino 272 1712 0 304 95 0 95 95 0 8 0 nchpl 144 2198 0 591 61 0 61 61 0 8 0 uvmvnodes 72 1967 0 0 36 0 36 36 0 8 0 vnodes 208 1967 0 0 104 0 104 104 0 8 0 namei 1024 6510 0 6510 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vcpupl 1984 2 0 0 1 0 1 1 0 8 0 vmpool 560 4 0 2 1 0 1 1 0 8 0 scsiplug 64 1 0 1 1 0 1 1 0 8 1 scxspl 192 6402 0 6402 8 7 1 7 0 8 1 plimitpl 152 35 0 27 1 0 1 1 0 8 0 sigapl 432 404 0 389 3 1 2 3 0 8 0 futexpl 56 4499 0 4499 1 0 1 1 0 8 1 knotepl 112 118 0 99 2 1 1 2 0 8 0 kqueuepl 104 58 0 55 1 0 1 1 0 8 0 pipelkpl 48 115 0 105 1 0 1 1 0 8 0 pipepl 120 230 0 211 1 0 1 1 0 8 0 fdescpl 496 405 0 389 3 0 3 3 0 8 0 filepl 152 3014 0 2913 6 0 6 6 0 8 2 lockfpl 104 87 0 86 1 0 1 1 0 8 0 lockfspl 48 26 0 25 1 0 1 1 0 8 0 sessionpl 112 19 0 8 1 0 1 1 0 8 0 pgrppl 48 23 0 12 1 0 1 1 0 8 0 ucredpl 96 371 0 362 1 0 1 1 0 8 0 zombiepl 144 389 0 388 1 0 1 1 0 8 0 processpl 896 422 0 388 4 0 4 4 0 8 0 procpl 632 854 0 810 5 0 5 5 0 8 1 srpgc 64 2 0 2 1 1 0 1 0 8 0 sosppl 128 3 0 3 1 0 1 1 0 8 1 sockpl 400 593 0 574 4 0 4 4 0 8 2 mcl64k 65536 773 0 0 97 0 97 97 0 8 1 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 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 mcl2k 2048 168 0 0 20 0 20 20 0 8 0 mtagpl 80 15 0 0 1 0 1 1 0 8 0 mbufpl 256 871 0 0 54 0 54 54 0 8 0 bufpl 280 6800 0 1340 390 0 390 390 0 8 0 anonpl 16 60014 0 42663 82 12 70 73 0 125 0 amapchunkpl 152 2285 0 2145 8 1 7 8 0 158 0 amappl16 192 1989 0 1023 57 8 49 50 0 8 0 amappl15 184 63 0 58 1 0 1 1 0 8 0 amappl14 176 151 0 149 1 0 1 1 0 8 0 amappl13 168 43 0 41 1 0 1 1 0 8 0 amappl12 160 9 0 9 2 2 0 1 0 8 0 amappl11 152 65 0 50 1 0 1 1 0 8 0 amappl10 144 10 0 6 1 0 1 1 0 8 0 amappl9 136 615 0 611 1 0 1 1 0 8 0 amappl8 128 134 0 116 1 0 1 1 0 8 0 amappl7 120 109 0 97 1 0 1 1 0 8 0 amappl6 112 59 0 50 1 0 1 1 0 8 0 amappl5 104 159 0 144 1 0 1 1 0 8 0 amappl4 96 709 0 677 1 0 1 1 0 8 0 amappl3 88 177 0 168 1 0 1 1 0 8 0 amappl2 80 2275 0 2198 3 1 2 3 0 8 0 amappl1 72 19275 0 18829 25 15 10 20 0 8 0 amappl 80 1121 0 1077 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 13 0 0 1 0 1 1 0 8 0 uaddrrnd 24 409 0 391 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 409 0 391 1 0 1 1 0 8 0 vmmpekpl 168 7102 0 7069 2 0 2 2 0 8 0 vmmpepl 168 57755 0 55624 128 10 118 119 0 357 25 vmsppl 368 408 0 391 2 0 2 2 0 8 0 pdppl 4096 825 0 784 6 0 6 6 0 8 0 pvpl 32 187847 0 167415 177 12 165 177 0 265 0 pvpl: pool(0xffffffff82645a88:pvpl): free list modified: page 0xfffffd8065a3f000; item ordinal 0; addr 0xfffffd8065a3f000 (p 0xfffffd8065a3f000); offset 0x0=0x0 pool(pvpl): free list modified: page 0xfffffd8065a3f000; item ordinal 0; addr 0xfffffd8065a3f000 (p 0xfffffd8065a3f000); offset 0x0=0x0 pvpl: pool(0xffffffff82645a88:pvpl): page inconsistency: page 0xfffffd8065a3f000; item ordinal 1; addr 0xb1dbb7436e18dcac pmappl 232 408 0 391 2 0 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 306 0 3 9 0 9 9 0 8 0