panic(ffffffff821fa75b) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82695458) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff82695458) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff82695458,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_copym(fffffd806b1c2b00,22c,580,2) at m_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline] m_copym(fffffd806b1c2b00,22c,580,2) at m_copym+0x174 sys/kern/uipc_mbuf.c:667 tcp_output(ffff800000a0baa0) at tcp_output+0x15ba sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd806eb3dc88,9,fffffd806f207400,0,0,ffff800020ed1ae0) at tcp_usrreq+0xa55 sosend(fffffd806eb3dc88,0,ffff800020e8dbd8,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:549 dofilewritev(ffff800020ed1ae0,4,ffff800020e8dbd8,0,ffff800020e8dcc0) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff800020ed1ae0,ffff800020e8dc70,ffff800020e8dcc0) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e8dd40) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e8dd40) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd6210, 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_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806a9d1f00+16 0x0!=0xe09a7e5b991137d3 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821fa75b) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82695458) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff82695458) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff82695458,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_copym(fffffd806b1c2b00,22c,580,2) at m_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline] m_copym(fffffd806b1c2b00,22c,580,2) at m_copym+0x174 sys/kern/uipc_mbuf.c:667 tcp_output(ffff800000a0baa0) at tcp_output+0x15ba sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd806eb3dc88,9,fffffd806f207400,0,0,ffff800020ed1ae0) at tcp_usrreq+0xa55 sosend(fffffd806eb3dc88,0,ffff800020e8dbd8,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:549 dofilewritev(ffff800020ed1ae0,4,ffff800020e8dbd8,0,ffff800020e8dcc0) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff800020ed1ae0,ffff800020e8dc70,ffff800020e8dcc0) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e8dd40) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e8dd40) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd6210, count: -12 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020e8d570 rbx 0xffff800020e8d620 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff81c4cb2f kprintf+0x16f r9 0x1 r10 0x2 r11 0x4023fc5c6f406db7 r12 0x3000000008 r13 0xffff800020e8d580 r14 0x100 r15 0x1 rip 0xffffffff8143c788 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020e8d560 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (sshd) pid=370506 stat=onproc flags process=12 proc=0 pri=24, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff800020ed0eb0,0xffff800020ed09e0 process=0xffff800020ec87c8 user=0xffff800020e88000, vmspace=0xfffffd806e962738 estcpu=1, cpticks=2, pctcpu=0.1 user=0, sys=2, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 93315 66624 12489 0 2 0 syz-executor.0 93315 396070 12489 0 7 0x4000000 syz-executor.0 13855 478080 0 0 3 0x14200 bored sosplice 45312 340773 1 0 3 0x100083 ttyin getty 63272 59497 9540 0 3 0x2 biowait syz-executor.1 12489 163039 9540 0 3 0x82 nanosleep syz-executor.0 9540 99568 98551 0 3 0x82 thrsleep syz-fuzzer 9540 419610 98551 0 3 0x4000082 nanosleep syz-fuzzer 9540 219835 98551 0 3 0x4000082 thrsleep syz-fuzzer 9540 62996 98551 0 3 0x4000082 thrsleep syz-fuzzer 9540 397312 98551 0 3 0x4000082 thrsleep syz-fuzzer 9540 285726 98551 0 2 0x4000082 syz-fuzzer 9540 70277 98551 0 3 0x4000082 thrsleep syz-fuzzer 9540 133304 98551 0 2 0x4000082 syz-fuzzer 9540 376650 98551 0 3 0x4000082 thrsleep syz-fuzzer 9540 254755 98551 0 3 0x4000082 thrsleep syz-fuzzer 98551 176656 71005 0 3 0x10008a pause ksh *71005 370506 88380 0 7 0x12 sshd 88380 417340 1 0 3 0x80 select sshd 80106 423545 41335 74 3 0x100092 bpf pflogd 41335 75055 1 0 3 0x80 netio pflogd 90278 265345 44575 73 3 0x100090 kqread syslogd 44575 217173 1 0 3 0x100082 netio syslogd 26721 129921 1 77 3 0x100090 poll dhclient 52946 337731 1 0 3 0x80 poll dhclient 48777 147994 0 0 3 0x14200 bored smr 82638 88646 0 0 2 0x14200 zerothread 59641 410273 0 0 3 0x14200 aiodoned aiodoned 21596 441246 0 0 3 0x14200 syncer update 25311 71208 0 0 3 0x14200 cleaner cleaner 92114 52697 0 0 3 0x14200 reaper reaper 71685 476415 0 0 3 0x14200 pgdaemon pagedaemon 70226 327737 0 0 3 0x14200 bored crynlk 86873 243622 0 0 3 0x14200 bored crypto 5111 19434 0 0 3 0x40014200 acpi0 acpi0 10216 338391 0 0 3 0x40014200 idle1 33318 253856 0 0 3 0x14200 bored softnet 17495 193756 0 0 3 0x14200 bored systqmp 61046 380253 0 0 3 0x14200 bored systq 98775 140343 0 0 3 0x40014200 bored softclock 72454 125699 0 0 3 0x40014200 idle0 1 74468 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 63272 (syz-executor.1) thread 0xffff800020e6d118 (59497) exclusive rrwlock inode r = 0 (0xfffffd806b367a28) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:311 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462 #3 ufs_ihashins+0x45 sys/ufs/ufs/ufs_ihash.c:140 #4 ffs_vget+0x13e sys/ufs/ffs/ffs_vfsops.c:1358 #5 ffs_inode_alloc+0x1cf sys/ufs/ffs/ffs_alloc.c:392 #6 ufs_mkdir+0xf4 sys/ufs/ufs/ufs_vnops.c:1162 #7 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450 #8 domkdirat+0x121 sys/kern/vfs_syscalls.c:3051 #9 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #9 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #10 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806b367098) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:311 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:603 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:575 #5 vfs_lookup+0xe6 sys/kern/vfs_lookup.c:419 #6 namei+0x63c sys/kern/vfs_lookup.c:249 #7 domkdirat+0x75 sys/kern/vfs_syscalls.c:3036 #8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #9 Xsyscall+0x128 Process 9540 (syz-fuzzer) thread 0xffff800020e6c758 (376650) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82648e48) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 uvm_map_inentry+0xbe sys/uvm/uvm_map.c:1890 #2 syscall+0x397 mi_syscall sys/sys/syscall_mi.h:81 [inline] #2 syscall+0x397 sys/arch/amd64/amd64/trap.c:570 #3 Xsyscall+0x128 Process 71005 (sshd) thread 0xffff800020ed1ae0 (370506) exclusive rwlock netlock r = 0 (0xffffffff824965b8) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 solock+0x5a sys/kern/uipc_socket2.c:282 #2 sosend+0x559 sys/kern/uipc_socket.c:537 #3 dofilewritev+0x1b6 sys/kern/sys_generic.c:365 #4 sys_write+0x83 sys/kern/sys_generic.c:285 #5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #6 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9509 6412K 6992K 78643K 10875 0 pcb 13 8K 8K 78643K 27 0 rtable 106 3K 4K 78643K 258 0 ifaddr 66 13K 13K 78643K 96 0 counters 43 33K 34K 78643K 53 0 ioctlops 0 0K 4K 78643K 1492 0 iov 0 0K 16K 78643K 17 0 mount 1 1K 1K 78643K 1 0 vnodes 1227 77K 77K 78643K 1313 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 0K 0K 78643K 22 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 5 13K 25K 78643K 136 0 proc 61 63K 95K 78643K 472 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 3 0 in_multi 36 2K 2K 78643K 51 0 ether_multi 1 0K 0K 78643K 2 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 31 148K 148K 78643K 31 0 exec 0 0K 1K 78643K 213 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 126 39K 39K 78643K 1376 0 UVM aobj 8 4K 4K 78643K 8 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 12 0K 0K 78643K 21 0 temp 94 3038K 3102K 78643K 2366 0 kqueue 3 4K 8K 78643K 8 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 7 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 29 0 27 1 0 1 1 0 8 0 rtentry 112 51 0 8 2 0 2 2 0 8 0 unpcb 120 103 0 93 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 19 0 19 1 1 0 1 0 8 0 tcpcb 544 48 0 44 1 0 1 1 0 8 0 inpcb 280 241 0 232 2 0 2 2 0 8 1 nd6 48 7 0 3 1 0 1 1 0 8 0 ppxss 1128 1 0 1 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 28 0 0 1 0 1 1 0 8 0 pfstkey 112 28 0 0 1 0 1 1 0 8 0 pfstate 328 28 0 0 3 0 3 3 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 220 0 40 12 0 12 12 0 8 0 art_table 32 222 0 40 2 0 2 2 0 8 0 art_node 16 50 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 3 1 0 1 1 0 8 0 semapl 112 20 0 10 1 0 1 1 0 8 0 shmpl 112 6 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1582 0 174 89 0 89 89 0 8 0 ffsino 272 1582 0 174 95 0 95 95 0 8 1 nchpl 144 1946 0 338 60 0 60 60 0 8 0 uvmvnodes 72 1699 0 0 31 0 31 31 0 8 0 vnodes 208 1699 0 0 90 0 90 90 0 8 0 namei 1024 5199 0 5198 1 0 1 1 0 8 0 percpumem 16 37 0 5 1 0 1 1 0 8 0 vcpupl 1984 1 0 0 1 0 1 1 0 8 0 vmpool 560 1 0 0 1 0 1 1 0 8 0 scxspl 192 4920 0 4919 2 1 1 2 0 8 0 plimitpl 152 26 0 18 1 0 1 1 0 8 0 sigapl 424 353 0 321 4 0 4 4 0 8 0 futexpl 56 1778 0 1778 1 0 1 1 0 8 1 knotepl 112 67 0 48 1 0 1 1 0 8 0 kqueuepl 144 14 0 12 1 0 1 1 0 8 0 pipelkpl 48 87 0 77 1 0 1 1 0 8 0 pipepl 120 174 0 155 1 0 1 1 0 8 0 fdescpl 496 337 0 321 3 0 3 3 0 8 0 filepl 152 1846 0 1746 5 0 5 5 0 8 1 lockfpl 104 19 0 18 1 0 1 1 0 8 0 lockfspl 48 9 0 8 1 0 1 1 0 8 0 sessionpl 112 19 0 8 1 0 1 1 0 8 0 pgrppl 48 21 0 10 1 0 1 1 0 8 0 ucredpl 96 117 0 107 1 0 1 1 0 8 0 zombiepl 144 321 0 321 1 0 1 1 0 8 1 processpl 984 353 0 321 5 0 5 5 0 8 0 procpl 624 598 0 556 4 0 4 4 0 8 0 sosppl 128 1 0 1 1 0 1 1 0 8 1 sockpl 400 375 0 356 4 0 4 4 0 8 2 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 175 0 0 21 0 21 21 0 8 0 mtagpl 80 21 0 0 1 0 1 1 0 8 0 mbufpl 256 318 0 0 19 0 19 19 0 8 0 bufpl 280 3427 0 134 236 0 236 236 0 8 0 anonpl 16 43139 0 29333 57 1 56 56 0 124 0 amapchunkpl 152 1666 0 1538 7 0 7 7 0 158 0 amappl16 192 1255 0 519 38 0 38 38 0 8 1 amappl15 184 1 0 1 1 1 0 1 0 8 0 amappl14 176 83 0 76 1 0 1 1 0 8 0 amappl13 168 76 0 73 1 0 1 1 0 8 0 amappl12 160 15 0 10 1 0 1 1 0 8 0 amappl11 152 57 0 40 1 0 1 1 0 8 0 amappl10 144 26 0 15 1 0 1 1 0 8 0 amappl9 136 436 0 434 1 0 1 1 0 8 0 amappl8 128 409 0 372 2 0 2 2 0 8 0 amappl7 120 118 0 107 1 0 1 1 0 8 0 amappl6 112 32 0 25 1 0 1 1 0 8 0 amappl5 104 186 0 170 1 0 1 1 0 8 0 amappl4 96 544 0 513 1 0 1 1 0 8 0 amappl3 88 158 0 151 1 0 1 1 0 8 0 amappl2 80 1735 0 1666 2 0 2 2 0 8 0 amappl1 72 17495 0 17061 23 7 16 18 0 8 5 amappl 80 849 0 805 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 7 0 0 1 0 1 1 0 8 0 uaddrrnd 24 338 0 321 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 338 0 321 1 0 1 1 0 8 0 vmmpekpl 168 6523 0 6483 2 0 2 2 0 8 0 vmmpepl 168 47835 0 45937 108 7 101 101 0 357 14 vmsppl 368 337 0 321 2 0 2 2 0 8 0 pdppl 4096 684 0 643 6 0 6 6 0 8 0 pvpl 32 153647 0 136719 141 0 141 141 0 265 4 pmappl 232 337 0 321 2 0 2 2 0 8 1 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 266 0 3 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821fa75b) at panic+0x15c sys/kern/subr_prf.c:207 pool_cache_get(ffffffff82695458) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff82695458) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff82695458,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_copym(fffffd806b1c2b00,22c,580,2) at m_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline] m_copym(fffffd806b1c2b00,22c,580,2) at m_copym+0x174 sys/kern/uipc_mbuf.c:667 tcp_output(ffff800000a0baa0) at tcp_output+0x15ba sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd806eb3dc88,9,fffffd806f207400,0,0,ffff800020ed1ae0) at tcp_usrreq+0xa55 sosend(fffffd806eb3dc88,0,ffff800020e8dbd8,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:549 dofilewritev(ffff800020ed1ae0,4,ffff800020e8dbd8,0,ffff800020e8dcc0) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff800020ed1ae0,ffff800020e8dc70,ffff800020e8dcc0) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e8dd40) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e8dd40) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd6210, count: -12 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020e00ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 x86_ipi_handler() at x86_ipi_handler+0xc6 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 x86_bus_space_io_read_1(3f8,5) at x86_bus_space_io_read_1+0x3c sys/arch/amd64/amd64/bus_space.c:639 comcnputc(800,72) at comcnputc+0xb8 sys/dev/ic/com.c:1250 cnputc(72) at cnputc+0x4c sys/dev/cons.c:239 kputchar(72,5,0) at kputchar+0x219 sys/kern/subr_prf.c:343 kprintf() at kprintf+0x1b7c sys/kern/subr_prf.c:1052 panic(ffffffff821fcada) at panic+0xf3 vprintf sys/kern/subr_prf.c:528 [inline] panic(ffffffff821fcada) at panic+0xf3 sys/kern/subr_prf.c:197 __assert(ffffffff822537a6,ffffffff8223e010,29e,ffffffff82221971) at __assert+0x2b sys/kern/subr_prf.c:154 proc_trampoline_mp() at proc_trampoline_mp+0x123 end trace frame: 0x0, count: 4 ddb{1}> trace x86_ipi_db(ffff800020e00ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 x86_ipi_handler() at x86_ipi_handler+0xc6 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 x86_bus_space_io_read_1(3f8,5) at x86_bus_space_io_read_1+0x3c sys/arch/amd64/amd64/bus_space.c:639 comcnputc(800,72) at comcnputc+0xb8 sys/dev/ic/com.c:1250 cnputc(72) at cnputc+0x4c sys/dev/cons.c:239 kputchar(72,5,0) at kputchar+0x219 sys/kern/subr_prf.c:343 kprintf() at kprintf+0x1b7c sys/kern/subr_prf.c:1052 panic(ffffffff821fcada) at panic+0xf3 vprintf sys/kern/subr_prf.c:528 [inline] panic(ffffffff821fcada) at panic+0xf3 sys/kern/subr_prf.c:197 __assert(ffffffff822537a6,ffffffff8223e010,29e,ffffffff82221971) at __assert+0x2b sys/kern/subr_prf.c:154 proc_trampoline_mp() at proc_trampoline_mp+0x123 end trace frame: 0x0, count: -11