Qà8Qpanic: pr_find_pagehead: mbufpl: incorrect page Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 pool_do_put(ffffffff825a3130,fffffd803cc20000) at pool_do_put+0x36a pool_put(ffffffff825a3130,fffffd803cc20000) at pool_put+0x4b sys/kern/subr_pool.c:802 m_free(fffffd803cc20000) at m_free+0x119 sys/kern/uipc_mbuf.c:459 ml_purge(ffff80001571b778) at ml_purge+0x50 m_freem sys/kern/uipc_mbuf.c:538 [inline] ml_purge(ffff80001571b778) at ml_purge+0x50 sys/kern/uipc_mbuf.c:1628 ifq_purge(ffff800000b5a260) at ifq_purge+0x97 sys/net/ifq.c:423 tapclose(5d01,7,2000,ffff800014915160) at tapclose+0xfc tun_dev_close sys/net/if_tun.c:417 [inline] tapclose(5d01,7,2000,ffff800014915160) at tapclose+0xfc sys/net/if_tun.c:396 spec_close(ffff80001571b890) at spec_close+0x3b0 sys/kern/spec_vnops.c:553 VOP_CLOSE(fffffd803e7e6820,7,fffffd803f7c69c0,ffff800014915160) at VOP_CLOSE+0xc0 sys/kern/vfs_vops.c:175 vn_closefile(fffffd803a3fce10,ffff800014915160) at vn_closefile+0xd3 vn_close sys/kern/vfs_vnops.c:301 [inline] vn_closefile(fffffd803a3fce10,ffff800014915160) at vn_closefile+0xd3 sys/kern/vfs_vnops.c:613 fdrop(fffffd803a3fce10,ffff800014915160) at fdrop+0xc2 sys/kern/kern_descrip.c:1273 closef(fffffd803a3fce10,ffff800014915160) at closef+0x118 sys/kern/kern_descrip.c:1257 fdfree(ffff800014915160) at fdfree+0x100 sys/kern/kern_descrip.c:1189 end trace frame: 0xffff80001571bae0, count: 0 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 pr_find_pagehead: mbufpl: incorrect page ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 pool_do_put(ffffffff825a3130,fffffd803cc20000) at pool_do_put+0x36a pool_put(ffffffff825a3130,fffffd803cc20000) at pool_put+0x4b sys/kern/subr_pool.c:802 m_free(fffffd803cc20000) at m_free+0x119 sys/kern/uipc_mbuf.c:459 ml_purge(ffff80001571b778) at ml_purge+0x50 m_freem sys/kern/uipc_mbuf.c:538 [inline] ml_purge(ffff80001571b778) at ml_purge+0x50 sys/kern/uipc_mbuf.c:1628 ifq_purge(ffff800000b5a260) at ifq_purge+0x97 sys/net/ifq.c:423 tapclose(5d01,7,2000,ffff800014915160) at tapclose+0xfc tun_dev_close sys/net/if_tun.c:417 [inline] tapclose(5d01,7,2000,ffff800014915160) at tapclose+0xfc sys/net/if_tun.c:396 spec_close(ffff80001571b890) at spec_close+0x3b0 sys/kern/spec_vnops.c:553 VOP_CLOSE(fffffd803e7e6820,7,fffffd803f7c69c0,ffff800014915160) at VOP_CLOSE+0xc0 sys/kern/vfs_vops.c:175 vn_closefile(fffffd803a3fce10,ffff800014915160) at vn_closefile+0xd3 vn_close sys/kern/vfs_vnops.c:301 [inline] vn_closefile(fffffd803a3fce10,ffff800014915160) at vn_closefile+0xd3 sys/kern/vfs_vnops.c:613 fdrop(fffffd803a3fce10,ffff800014915160) at fdrop+0xc2 sys/kern/kern_descrip.c:1273 closef(fffffd803a3fce10,ffff800014915160) at closef+0x118 sys/kern/kern_descrip.c:1257 fdfree(ffff800014915160) at fdfree+0x100 sys/kern/kern_descrip.c:1189 exit1(ffff800014915160,0,1) at exit1+0x32f sys/kern/kern_exit.c:196 sys_exit(ffff800014915160,ffff80001571bb20,ffff80001571bb70) at sys_exit+0x17 sys/kern/kern_exit.c:94 syscall(ffff80001571bbf0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,1,0,1,0,7f7ffffded44) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffded10, count: -18 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80001571b520 rbx 0xffff80001571b5d0 rdx 0x2 rcx 0 rax 0 r8 0xffff80001571b4e0 r9 0x1 r10 0 r11 0x3e2de8f5edf57517 r12 0x3000000008 r13 0xffff80001571b530 r14 0x100 r15 0x1 rip 0xffffffff81de0cc8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001571b510 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=507595 stat=onproc flags process=1008 proc=2000 pri=32, usrpri=82, nice=20 forw=0xffffffffffffffff, list=0xffff800014914508,0xffffffff825a1a88 process=0xffff8000148a2018 user=0xffff800015716000, vmspace=0xfffffd803f014330 estcpu=36, cpticks=3, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 9223 176987 0 0 3 0x14200 acct acct 89377 139241 1 0 3 0x80 nanosleep init 58934 448833 81047 0 2 0x2 syz-executor.0 53489 230199 0 0 3 0x14200 bored sosplice 81047 86873 45016 0 3 0x82 thrsleep syz-fuzzer 81047 133410 45016 0 3 0x4000082 nanosleep syz-fuzzer 81047 99663 45016 0 3 0x4000082 thrsleep syz-fuzzer 81047 400893 45016 0 3 0x4000082 thrsleep syz-fuzzer 81047 285684 45016 0 3 0x4000082 thrsleep syz-fuzzer 81047 193823 45016 0 2 0x4000082 syz-fuzzer 81047 276146 45016 0 3 0x4000082 thrsleep syz-fuzzer 45016 177746 10803 0 3 0x10008a pause ksh 10803 47798 74425 0 3 0x92 select sshd 74425 180461 1 0 3 0x80 select sshd 99192 356670 73213 73 3 0x100090 kqread syslogd 73213 188541 1 0 3 0x100082 netio syslogd 68626 359315 1 77 3 0x100090 poll dhclient 96819 380133 1 0 3 0x80 poll dhclient 46263 352777 0 0 2 0x14200 zerothread 20568 295696 0 0 3 0x14200 aiodoned aiodoned 33467 74853 0 0 3 0x14200 syncer update 57841 511133 0 0 3 0x14200 cleaner cleaner 19463 133594 0 0 3 0x14200 reaper reaper 68441 51867 0 0 3 0x14200 pgdaemon pagedaemon 42589 114489 0 0 3 0x14200 bored crynlk 29136 503065 0 0 3 0x14200 bored crypto 95715 230545 0 0 3 0x40014200 acpi0 acpi0 43537 182746 0 0 2 0x14200 softnet 81177 283217 0 0 3 0x14200 bored systqmp 30393 495287 0 0 3 0x14200 bored systq 15857 402581 0 0 3 0x40014200 bored softclock 73249 111074 0 0 3 0x40014200 idle0 78006 154806 0 0 3 0x14200 bored smr 1 31121 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 Kern Lim devbuf 9565 6380K 7738K 78643K 16726 0 0 pcb 13 10K 12K 78643K 557 0 0 rtable 87 11K 13K 78643K 1632 0 0 ifaddr 73 15K 17K 78643K 465 0 0 counters 19 16K 16K 78643K 19 0 0 ioctlops 0 0K 2K 78643K 152 0 0 iov 0 0K 32K 78643K 1719 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1223 77K 77K 78643K 3776 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 5K 78643K 45 0 0 VM map 18 4K 4K 78643K 33 0 0 sem 12 0K 0K 78643K 1274 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1793 195K 288K 78643K 12645 0 0 file desc 4 9K 25K 78643K 2689 0 0 sigio 0 0K 0K 78643K 51 0 0 proc 43 30K 63K 78643K 1003 0 0 subproc 23 1K 2K 78643K 212 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 0K 78643K 289 0 0 in_multi 14 0K 2K 78643K 252 0 0 ether_multi 1 0K 0K 78643K 21 0 0 mrt 0 0K 0K 78643K 6 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 114 503K 503K 78643K 114 0 0 exec 0 0K 1K 78643K 624 0 0 pagedep 1 8K 8K 78643K 1 0 0 inodedep 1 32K 32K 78643K 1 0 0 newblk 1 0K 0K 78643K 1 0 0 VM swap 7 26K 26K 78643K 7 0 0 UVM amap 137 169K 170K 78643K 7611 0 0 UVM aobj 130 4K 4K 78643K 136 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 0K 78643K 587 0 0 NDP 18 0K 1K 78643K 142 0 0 temp 212 3540K 4185K 78643K 123911 0 0 kqueue 0 0K 0K 78643K 13 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 59 0 54 1 0 1 1 0 8 0 rtpcb 80 276 0 274 1 0 1 1 0 8 0 rtentry 112 267 0 238 2 0 2 2 0 8 0 unpcb 120 1873 0 1862 2 1 1 2 0 8 0 syncache 264 27 0 27 8 8 0 1 0 8 0 tcpqe 32 176 0 176 4 4 0 1 0 8 0 tcpcb 544 2262 0 2258 33 31 2 14 0 8 1 ipq 40 28 0 28 10 10 0 1 0 8 0 ipqe 40 679 0 679 10 10 0 1 0 8 0 inpcb 280 5235 0 5228 24 20 4 9 0 8 3 ip6q 72 2 0 2 1 1 0 1 0 8 0 ip6af 40 6 0 6 1 1 0 1 0 8 0 nd6 48 31 0 31 4 4 0 1 0 8 0 pkpcb 40 13 0 13 4 4 0 1 0 8 0 ppxss 1128 55 0 55 7 6 1 1 0 8 1 art_heap8 4096 9 0 8 6 5 1 4 0 8 0 art_heap4 256 1034 0 897 30 19 11 15 0 8 0 art_table 32 1043 0 905 2 0 2 2 0 8 0 art_node 16 266 0 239 1 0 1 1 0 8 0 sysvmsgpl 40 32 0 24 1 0 1 1 0 8 0 semapl 112 1272 0 1262 1 0 1 1 0 8 0 shmpl 112 134 0 6 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 5944 0 4544 46 0 46 46 0 8 0 ffsino 240 5944 0 4544 83 0 83 83 0 8 0 nchpl 144 11000 0 10539 60 41 19 60 0 8 0 uvmvnodes 72 6661 0 0 122 0 122 122 0 8 0 vnodes 208 6661 0 0 351 0 351 351 0 8 0 namei 1024 42630 0 42630 2 1 1 1 0 8 1 vcpupl 1984 16 0 0 2 0 2 2 0 8 0 vmpool 520 31 0 15 3 1 2 2 0 8 0 scsiplug 64 4 0 4 2 2 0 1 0 8 0 scxspl 192 36273 0 36273 19 18 1 7 0 8 1 plimitpl 152 257 0 251 1 0 1 1 0 8 0 sigapl 432 2832 0 2820 2 0 2 2 0 8 0 futexpl 56 87812 0 87812 3 2 1 1 0 8 1 knotepl 112 602 0 583 1 0 1 1 0 8 0 kqueuepl 104 1048 0 1046 7 6 1 4 0 8 0 pipepl 112 2404 0 2388 8 6 2 2 0 8 1 fdescpl 424 2833 0 2820 2 0 2 2 0 8 0 filepl 120 32988 0 32906 30 25 5 11 0 8 2 lockfpl 104 1132 0 1131 1 0 1 1 0 8 0 lockfspl 48 382 0 381 1 0 1 1 0 8 0 sessionpl 112 28 0 19 1 0 1 1 0 8 0 pgrppl 48 103 0 94 1 0 1 1 0 8 0 ucredpl 96 10437 0 10429 1 0 1 1 0 8 0 zombiepl 144 2825 0 2823 1 0 1 1 0 8 0 processpl 864 2853 0 2823 4 0 4 4 0 8 0 procpl 632 6268 0 6232 4 0 4 4 0 8 0 sosppl 128 67 0 67 11 10 1 1 0 8 1 sockpl 384 7609 0 7589 48 41 7 14 0 8 3 mcl64k 65536 273 0 273 6 5 1 1 0 8 1 mcl16k 16384 35 0 35 11 11 0 1 0 8 0 mcl12k 12288 92 0 92 10 9 1 1 0 8 1 mcl9k 9216 58 0 58 12 12 0 1 0 8 0 mcl8k 8192 146 0 146 5 4 1 1 0 8 1 mcl4k 4096 390 0 390 5 4 1 1 0 8 1 mcl2k2 2112 28 0 28 11 11 0 1 0 8 0 mcl2k 2048 72978 0 72933 28 21 7 16 0 8 0 mtagpl 80 101 0 94 3 2 1 1 0 8 0 mbufpl 256 143737 0 143600 86 71 15 23 0 8 4 bufpl 256 16767 0 10121 417 0 417 417 0 8 0 anonpl 16 372873 0 352889 175 76 99 99 0 62 16 amapchunkpl 152 14455 0 14322 55 46 9 16 0 158 3 amappl16 192 18842 0 17682 186 119 67 71 0 8 8 amappl15 184 19 0 19 2 1 1 1 0 8 1 amappl14 176 1623 0 1619 1 0 1 1 0 8 0 amappl13 168 166 0 165 1 0 1 1 0 8 0 amappl12 160 6 0 2 1 0 1 1 0 8 0 amappl11 152 301 0 289 1 0 1 1 0 8 0 amappl10 144 368 0 367 1 0 1 1 0 8 0 amappl9 136 946 0 940 1 0 1 1 0 8 0 amappl8 128 547 0 505 2 0 2 2 0 8 0 amappl7 120 433 0 427 1 0 1 1 0 8 0 amappl6 112 296 0 286 1 0 1 1 0 8 0 amappl5 104 263 0 253 1 0 1 1 0 8 0 amappl4 96 3008 0 2980 1 0 1 1 0 8 0 amappl3 88 1476 0 1469 1 0 1 1 0 8 0 amappl2 80 21207 0 21141 3 1 2 3 0 8 0 amappl1 72 60462 0 60082 27 18 9 20 0 8 0 amappl 80 6701 0 6654 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 17 0 17 1 1 0 1 0 8 0 aobjpl 64 135 0 6 3 0 3 3 0 8 0 uaddrrnd 24 2864 0 2820 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2864 0 2820 1 0 1 1 0 8 0 vmmpekpl 168 21300 0 21265 2 0 2 2 0 8 0 vmmpepl 168 348185 0 345993 293 167 126 145 0 357 21 vmsppl 272 2832 0 2820 3 2 1 2 0 8 0 pdppl 4096 5734 0 5686 9 2 7 7 0 8 0 pvpl 32 964446 0 942114 380 158 222 329 0 265 32 pmappl 200 2863 0 2835 2 0 2 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 729 0 178 17 1 16 17 0 8 0