login: panic: pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806d7e9900+16 0x0!=0x77fe87b540b50fc5 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(ffffffff821fb2d4) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82666320) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff82666320) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff82666320,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_gethdr(2,1) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 rtm_msg1(2,ffff800020f589d0) at rtm_msg1+0x6e sys/net/rtsock.c:1534 rtm_send(fffffd806f4eb230,2,0,0) at rtm_send+0x120 rtm_miss sys/net/rtsock.c:1679 [inline] rtm_send(fffffd806f4eb230,2,0,0) at rtm_send+0x120 sys/net/rtsock.c:1657 rt_ifa_del(ffff8000009db800,200404,ffff8000009db858,0) at rt_ifa_del+0x3bb sys/net/route.c:1190 rt_ifa_dellocal(ffff8000009db800) at rt_ifa_dellocal+0x149 sys/net/route.c:1290 in_purgeaddr(ffff8000009db800) at in_purgeaddr+0x12a sys/netinet/in.c:755 in_ifdetach(ffff8000009d5000) at in_ifdetach+0x74 sys/netinet/in.c:971 if_detach(ffff8000009d5000) at if_detach+0x140 sys/net/if.c:1149 tun_clone_destroy(ffff8000009d5000) at tun_clone_destroy+0x1f2 sys/net/if_tun.c:329 tun_dev_close(5d00,7) at tun_dev_close+0x160 sys/net/if_tun.c:480 end trace frame: 0xffff800020f58ec0, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806d7e9900+16 0x0!=0x77fe87b540b50fc5 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821fb2d4) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82666320) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff82666320) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff82666320,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_gethdr(2,1) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 rtm_msg1(2,ffff800020f589d0) at rtm_msg1+0x6e sys/net/rtsock.c:1534 rtm_send(fffffd806f4eb230,2,0,0) at rtm_send+0x120 rtm_miss sys/net/rtsock.c:1679 [inline] rtm_send(fffffd806f4eb230,2,0,0) at rtm_send+0x120 sys/net/rtsock.c:1657 rt_ifa_del(ffff8000009db800,200404,ffff8000009db858,0) at rt_ifa_del+0x3bb sys/net/route.c:1190 rt_ifa_dellocal(ffff8000009db800) at rt_ifa_dellocal+0x149 sys/net/route.c:1290 in_purgeaddr(ffff8000009db800) at in_purgeaddr+0x12a sys/netinet/in.c:755 in_ifdetach(ffff8000009d5000) at in_ifdetach+0x74 sys/netinet/in.c:971 if_detach(ffff8000009d5000) at if_detach+0x140 sys/net/if.c:1149 tun_clone_destroy(ffff8000009d5000) at tun_clone_destroy+0x1f2 sys/net/if_tun.c:329 tun_dev_close(5d00,7) at tun_dev_close+0x160 sys/net/if_tun.c:480 spec_close(ffff800020f58ed0) at spec_close+0x311 sys/kern/spec_vnops.c:555 VOP_CLOSE(fffffd806ed295b8,7,fffffd807f7bfae0,ffff800020e6c278) at VOP_CLOSE+0xc0 sys/kern/vfs_vops.c:174 vn_closefile(fffffd806d056d20,ffff800020e6c278) at vn_closefile+0xd7 vn_close sys/kern/vfs_vnops.c:298 [inline] vn_closefile(fffffd806d056d20,ffff800020e6c278) at vn_closefile+0xd7 sys/kern/vfs_vnops.c:614 fdrop(fffffd806d056d20,ffff800020e6c278) at fdrop+0xc2 sys/kern/kern_descrip.c:1276 closef(fffffd806d056d20,ffff800020e6c278) at closef+0x11c sys/kern/kern_descrip.c:1260 fdfree(ffff800020e6c278) at fdfree+0x101 sys/kern/kern_descrip.c:1192 exit1(ffff800020e6c278,0,9,1) at exit1+0x32c sys/kern/kern_exit.c:197 postsig(ffff800020e6c278,9) at postsig+0x4ed sigexit sys/kern/kern_sig.c:1483 [inline] postsig(ffff800020e6c278,9) at postsig+0x4ed sys/kern/kern_sig.c:1415 userret(ffff800020e6c278) at userret+0x199 sys/kern/kern_sig.c:1867 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffee1b0, count: -24 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020f586f0 rbx 0xffff800020f587a0 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff8199412f kprintf+0x16f r9 0x1 r10 0x8f0601c13e9f0367 r11 0x156e3be079de0170 r12 0x3000000008 r13 0xffff800020f58700 r14 0x100 r15 0x1 rip 0xffffffff810c3ce8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020f586e0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=506023 stat=onproc flags process=a proc=2000 pri=32, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020e6c758,0xffff800020e6c018 process=0xffff800020e80f70 user=0xffff800020f54000, vmspace=0xfffffd807f000000 estcpu=20, cpticks=3, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 10000 251123 53269 0 3 0x82 thrsleep syz-execprog 10000 154941 53269 0 3 0x4000082 thrsleep syz-execprog 10000 85470 53269 0 3 0x4000082 kqread syz-execprog 10000 380248 53269 0 3 0x4000082 thrsleep syz-execprog 10000 521910 53269 0 3 0x4000082 thrsleep syz-execprog 10000 422926 53269 0 3 0x4000082 thrsleep syz-execprog 10000 316745 53269 0 3 0x4000082 thrsleep syz-execprog 10000 129989 53269 0 3 0x4000082 wait syz-execprog 53269 65145 37173 0 3 0x10008a pause ksh 37173 90837 87713 0 3 0x92 select sshd 7400 173599 1 0 3 0x100083 ttyin getty 87713 538 1 0 3 0x80 select sshd 17665 79756 95874 74 3 0x100092 bpf pflogd 95874 271273 1 0 3 0x80 netio pflogd 16155 272097 65467 73 3 0x100090 kqread syslogd 65467 213494 1 0 3 0x100082 netio syslogd 44494 283049 1 77 3 0x100090 poll dhclient 29145 126481 1 0 3 0x80 poll dhclient 12502 41118 0 0 3 0x14200 bored smr 85388 41485 0 0 3 0x14200 pgzero zerothread 68826 145148 0 0 3 0x14200 aiodoned aiodoned 3858 515067 0 0 3 0x14200 syncer update 45219 470128 0 0 3 0x14200 cleaner cleaner 86935 1948 0 0 3 0x14200 reaper reaper 90515 26307 0 0 3 0x14200 pgdaemon pagedaemon 52755 486941 0 0 3 0x14200 bored crynlk 34896 199096 0 0 3 0x14200 bored crypto 71744 181690 0 0 3 0x40014200 acpi0 acpi0 2624 202692 0 0 3 0x40014200 idle1 3093 432612 0 0 3 0x14200 bored softnet 16864 496443 0 0 3 0x14200 bored systqmp 33071 167247 0 0 3 0x14200 bored systq 27876 115605 0 0 3 0x40014200 bored softclock 88592 425069 0 0 7 0x40014200 idle0 1 63384 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks CPU 0: exclusive sched_lock &sched_lock r = 0 (0xffffffff8265c008) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 sleep_setup+0xf1 sys/kern/kern_synch.c:380 #2 msleep+0xe5 sleep_setup_timeout sys/kern/kern_synch.c:435 [inline] #2 msleep+0xe5 sys/kern/kern_synch.c:245 #3 taskq_next_work+0xbe sys/kern/kern_task.c:323 #4 taskq_thread+0xe5 sys/kern/kern_task.c:366 #5 proc_trampoline+0x1c ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9464 6395K 6395K 78643K 10557 0 pcb 13 8K 8K 78643K 13 0 rtable 79 2K 2K 78643K 163 0 ifaddr 37 9K 9K 78643K 39 0 counters 41 33K 33K 78643K 41 0 ioctlops 0 0K 4K 78643K 1468 0 mount 1 1K 1K 78643K 1 0 vnodes 1183 74K 75K 78643K 1188 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 1K 1K 78643K 2 0 sem 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 2 4K 12K 78643K 18 0 proc 59 63K 83K 78643K 398 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 22 1K 1K 78643K 22 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 19 95K 95K 78643K 19 0 exec 0 0K 1K 78643K 197 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 73 12K 12K 78643K 948 0 UVM aobj 2 2K 2K 78643K 2 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 7 0K 0K 78643K 7 0 temp 29 3033K 3097K 78643K 1921 0 kqueue 3 4K 4K 78643K 3 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 4 0 1 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 17 0 15 1 0 1 1 0 8 0 rtentry 112 34 0 3 1 0 1 1 0 8 0 unpcb 120 29 0 19 1 0 1 1 0 8 0 syncache 264 5 0 5 1 0 1 1 0 8 1 tcpcb 544 8 0 5 1 0 1 1 0 8 0 inpcb 280 34 0 28 1 0 1 1 0 8 0 nd6 48 3 0 0 1 0 1 1 0 8 0 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 10 0 0 1 0 1 1 0 8 0 pfstkey 112 10 0 0 1 0 1 1 0 8 0 pfstate 328 10 0 0 1 0 1 1 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 256 145 0 2 10 0 10 10 0 8 0 art_table 32 146 0 2 2 0 2 2 0 8 0 art_node 16 33 0 6 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1423 0 20 88 0 88 88 0 8 0 ffsino 272 1423 0 20 94 0 94 94 0 8 0 nchpl 144 1647 0 36 60 0 60 60 0 8 0 uvmvnodes 72 1433 0 0 27 0 27 27 0 8 0 vnodes 208 1433 0 0 76 0 76 76 0 8 0 namei 1024 4162 0 4162 1 0 1 1 0 8 1 percpumem 16 31 0 0 1 0 1 1 0 8 0 scxspl 192 4529 0 4529 2 1 1 2 0 8 1 plimitpl 152 15 0 8 1 0 1 1 0 8 0 sigapl 424 241 0 212 4 0 4 4 0 8 0 knotepl 112 39 0 30 1 0 1 1 0 8 0 kqueuepl 144 2 0 0 1 0 1 1 0 8 0 pipelkpl 48 74 0 68 1 0 1 1 0 8 0 pipepl 120 148 0 137 1 0 1 1 0 8 0 fdescpl 496 226 0 212 3 0 3 3 0 8 0 filepl 152 1102 0 1046 3 0 3 3 0 8 0 lockfpl 104 5 0 4 1 0 1 1 0 8 0 lockfspl 48 3 0 2 1 0 1 1 0 8 0 sessionpl 112 19 0 9 1 0 1 1 0 8 0 pgrppl 48 19 0 9 1 0 1 1 0 8 0 ucredpl 96 62 0 53 1 0 1 1 0 8 0 zombiepl 144 213 0 212 1 0 1 1 0 8 0 processpl 984 241 0 212 5 0 5 5 0 8 1 procpl 624 248 0 212 3 0 3 3 0 8 0 sockpl 400 80 0 62 2 0 2 2 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 78 0 0 10 0 10 10 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 93 0 0 6 0 6 6 0 8 0 bufpl 280 3817 0 190 260 0 260 260 0 8 0 anonpl 16 22364 0 20744 14 1 13 13 0 124 5 amapchunkpl 152 838 0 770 5 0 5 5 0 158 2 amappl16 192 136 0 107 2 0 2 2 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 32 0 25 1 0 1 1 0 8 0 amappl13 168 20 0 19 1 0 1 1 0 8 0 amappl12 160 3 0 2 2 1 1 1 0 8 0 amappl11 152 52 0 37 1 0 1 1 0 8 0 amappl10 144 19 0 15 1 0 1 1 0 8 0 amappl9 136 246 0 244 1 0 1 1 0 8 0 amappl8 128 269 0 259 1 0 1 1 0 8 0 amappl7 120 115 0 104 1 0 1 1 0 8 0 amappl6 112 25 0 23 1 0 1 1 0 8 0 amappl5 104 130 0 115 1 0 1 1 0 8 0 amappl4 96 497 0 470 1 0 1 1 0 8 0 amappl3 88 111 0 106 1 0 1 1 0 8 0 amappl2 80 941 0 883 3 0 3 3 0 8 1 amappl1 72 15417 0 14997 25 7 18 20 0 8 8 amappl 80 475 0 447 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 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 226 0 212 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 226 0 212 1 0 1 1 0 8 0 vmmpekpl 168 6273 0 6248 2 0 2 2 0 8 0 vmmpepl 168 32806 0 31890 83 3 80 80 0 357 38 vmsppl 368 225 0 212 2 0 2 2 0 8 0 pdppl 4096 460 0 424 6 0 6 6 0 8 0 pvpl 32 112641 0 108624 115 0 115 115 0 265 80 pmappl 232 225 0 212 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 232 0 3 7 0 7 7 0 8 0 ddb{1}>