panic: pool_cache_item_magic_chWeARcNkI: NGm:b uSfPplL NcOpTu LfOreWEeR lEDi sOtN mSoYdSiCfAiLeLd : 13i6t e-m1 5a5d1d2r0 0ExXfIffT ff0d 98 0 6aStopped at savectx+0xb1: movl $0,%gs:0x530 TID PID UID PRFLAGS PFLAGS CPU COMMAND *260236 94277 0 0x2 0 0 syz-executor.1 158771 52341 0 0x12 0 1 sshd savectx() at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffda280, count: 14 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 0xfffffd806a645100+16 0x0!=0x50dda3452e73499c ddb{0}> trace savectx() at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffda280, count: -1 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff800023101b80 rbx 0 rdx 0x8b rcx 0x2 rax 0x39 r8 0xffffffff819672cf kprintf+0x16f r9 0x1 r10 0x2 r11 0x292f3cab91a714a3 r12 0 r13 0 r14 0xffff800020dfd398 r15 0 rip 0xffffffff813223f1 savectx+0xb1 cs 0x8 rflags 0x46 rsp 0xffff800023101b00 ss 0 savectx+0xb1: movl $0,%gs:0x530 ddb{0}> show proc PROC (syz-executor.1) pid=260236 stat=onproc flags process=2 proc=0 pri=17, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020ddc9c8,0xffff800020dfc298 process=0xffff800020df0f70 user=0xffff8000230fc000, vmspace=0xfffffd807f000a10 estcpu=36, cpticks=2, pctcpu=0.11 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 13707 219226 70822 0 2 0 syz-executor.0 *94277 260236 63363 0 7 0x2 syz-executor.1 70822 523221 63363 0 3 0x82 nanosleep syz-executor.0 63363 153503 75632 0 2 0x2 syz-fuzzer 63363 468372 75632 0 3 0x4000082 nanosleep syz-fuzzer 63363 90428 75632 0 3 0x4000082 thrsleep syz-fuzzer 63363 512292 75632 0 3 0x4000082 thrsleep syz-fuzzer 63363 350695 75632 0 3 0x4000082 thrsleep syz-fuzzer 63363 77506 75632 0 3 0x4000082 thrsleep syz-fuzzer 63363 501876 75632 0 3 0x4000082 thrsleep syz-fuzzer 63363 164797 75632 0 3 0x4000082 kqread syz-fuzzer 63363 435650 75632 0 3 0x4000082 thrsleep syz-fuzzer 63363 398531 75632 0 3 0x4000082 thrsleep syz-fuzzer 75632 510087 52341 0 3 0x10008a pause ksh 52341 158771 57174 0 7 0x12 sshd 93034 378442 1 0 3 0x100083 ttyin getty 57174 249708 1 0 3 0x80 select sshd 76131 202145 8721 74 3 0x100092 bpf pflogd 8721 277695 1 0 3 0x80 netio pflogd 37510 391875 84252 73 3 0x100090 kqread syslogd 84252 8610 1 0 3 0x100082 netio syslogd 43473 438133 1 77 3 0x100090 poll dhclient 28308 123994 1 0 3 0x80 poll dhclient 37683 258938 0 0 3 0x14200 bored smr 7841 510328 0 0 2 0x14200 zerothread 99475 313964 0 0 3 0x14200 aiodoned aiodoned 68286 391562 0 0 3 0x14200 syncer update 49577 204655 0 0 3 0x14200 cleaner cleaner 16712 102051 0 0 3 0x14200 reaper reaper 17438 109383 0 0 3 0x14200 pgdaemon pagedaemon 45772 249452 0 0 3 0x14200 bored crynlk 75626 378629 0 0 3 0x14200 bored crypto 38656 379860 0 0 3 0x40014200 acpi0 acpi0 79747 41249 0 0 3 0x40014200 idle1 27813 189769 0 0 3 0x14200 bored softnet 19536 363956 0 0 3 0x14200 bored systqmp 66349 260142 0 0 3 0x14200 bored systq 57338 313959 0 0 3 0x40014200 bored softclock 27725 60591 0 0 3 0x40014200 idle0 1 190710 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &iopl->mtx r = 0 (0xffff800000038170) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 scsi_xsh_runqueue+0x95 sys/scsi/scsi_base.c:582 #4 scsi_xsh_add+0xc9 sys/scsi/scsi_base.c:535 #5 sdstrategy+0x187 sys/scsi/sd.c:585 #6 spec_strategy+0x74 sys/kern/spec_vnops.c:473 #7 VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:712 #8 bwrite+0x1b9 sys/kern/vfs_bio.c:756 #9 ffs_update+0x2c2 sys/ufs/ffs/ffs_inode.c:113 #10 ufs_mkdir+0x665 sys/ufs/ufs/ufs_vnops.c:1232 #11 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450 #12 domkdirat+0x121 sys/kern/vfs_syscalls.c:3051 #13 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #13 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #14 Xsyscall+0x128 Process 94277 (syz-executor.1) thread 0xffff800020dfd398 (260236) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828a6230) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 #2 mi_switch+0x392 sys/kern/sched_bsd.c:435 #3 sleep_finish+0x113 sys/kern/kern_synch.c:418 #4 sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] #4 sleep_finish_all+0x32 sys/kern/kern_synch.c:393 #5 tsleep+0x1cc sys/kern/kern_synch.c:155 #6 biowait+0xa6 sys/kern/vfs_bio.c:1256 #7 bwrite+0x1e4 sys/kern/vfs_bio.c:765 #8 ffs_update+0x2c2 sys/ufs/ffs/ffs_inode.c:113 #9 ufs_mkdir+0x42e sys/ufs/ufs/ufs_vnops.c:1197 #10 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450 #11 domkdirat+0x121 sys/kern/vfs_syscalls.c:3051 #12 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #12 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #13 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806e2aac48) #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+0x1e2 sys/ufs/ffs/ffs_alloc.c:394 #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 (0xfffffd80686975f0) #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 exclusive mutex &iopl->mtx r = 0 (0xffff800000038170) #0 witness_lock+0x4c7 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4c7 sys/kern/subr_witness.c:1164 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 scsi_xsh_runqueue+0x95 sys/scsi/scsi_base.c:582 #4 scsi_xsh_add+0xc9 sys/scsi/scsi_base.c:535 #5 sdstrategy+0x187 sys/scsi/sd.c:585 #6 spec_strategy+0x74 sys/kern/spec_vnops.c:473 #7 VOP_STRATEGY+0x99 sys/kern/vfs_vops.c:712 #8 bwrite+0x1b9 sys/kern/vfs_bio.c:756 #9 ffs_update+0x2c2 sys/ufs/ffs/ffs_inode.c:113 #10 ufs_mkdir+0x665 sys/ufs/ufs/ufs_vnops.c:1232 #11 VOP_MKDIR+0xc6 sys/kern/vfs_vops.c:450 #12 domkdirat+0x121 sys/kern/vfs_syscalls.c:3051 #13 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] #13 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 #14 Xsyscall+0x128 Process 52341 (sshd) thread 0xffff800020e4e4f0 (158771) exclusive rwlock netlock r = 0 (0xffffffff826e83a8) #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:543 #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 9543 6987K 7110K 78643K 11084 0 pcb 13 8K 8K 78643K 37 0 rtable 102 3K 6K 78643K 300 0 ifaddr 55 12K 13K 78643K 90 0 counters 43 33K 34K 78643K 47 0 ioctlops 0 0K 4K 78643K 1495 0 iov 0 0K 12K 78643K 33 0 mount 1 1K 1K 78643K 1 0 vnodes 1223 77K 77K 78643K 1349 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 4 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 18 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 5 13K 25K 78643K 146 0 sigio 0 0K 0K 78643K 2 0 proc 61 63K 95K 78643K 445 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 38 0 in_multi 36 2K 2K 78643K 56 0 ether_multi 1 0K 0K 78643K 5 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 49 228K 228K 78643K 49 0 exec 0 0K 1K 78643K 219 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 118 39K 48K 78643K 1375 0 UVM aobj 9 2K 2K 78643K 9 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 20 0 NDP 8 0K 0K 78643K 15 0 temp 85 3849K 3913K 78643K 3057 0 kqueue 3 4K 10K 78643K 12 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 6 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 23 0 21 1 0 1 1 0 8 0 rtentry 112 50 0 9 2 0 2 2 0 8 0 unpcb 120 79 0 69 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 145 0 145 1 1 0 1 0 8 0 tcpcb 544 78 0 74 2 0 2 2 0 8 1 inpcb 296 177 0 170 2 0 2 2 0 8 1 nd6 48 8 0 4 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 pfrke_plain 160 4 0 4 1 0 1 1 0 8 1 pfrktable 1344 34 0 34 1 0 1 1 0 8 1 pfstitem 24 24 0 0 1 0 1 1 0 8 0 pfstkey 112 24 0 0 1 0 1 1 0 8 0 pfstate 328 24 0 0 2 0 2 2 0 8 0 pfrule 1360 27 0 22 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 218 0 46 13 0 13 13 0 8 0 art_table 32 219 0 46 2 0 2 2 0 8 0 art_node 16 49 0 11 1 0 1 1 0 8 0 sysvmsgpl 40 12 0 4 1 0 1 1 0 8 0 semupl 112 3 0 3 1 0 1 1 0 8 1 semapl 112 10 0 0 1 0 1 1 0 8 0 shmpl 112 7 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1590 0 185 89 0 89 89 0 8 0 ffsino 272 1590 0 185 95 1 94 94 0 8 0 nchpl 144 1978 0 382 60 0 60 60 0 8 0 rtmask 32 8 0 8 1 0 1 1 0 8 1 uvmvnodes 72 1745 0 0 32 0 32 32 0 8 0 vnodes 208 1745 0 0 92 0 92 92 0 8 0 namei 1024 5381 0 5381 2 1 1 1 0 8 1 percpumem 16 34 0 2 1 0 1 1 0 8 0 vcpupl 1984 2 0 0 1 0 1 1 0 8 0 vmpool 560 2 0 0 1 0 1 1 0 8 0 pfiaddrpl 120 10 0 10 1 0 1 1 0 8 1 scsiplug 64 1 0 1 1 0 1 1 0 8 1 scxspl 192 5790 0 5790 9 2 7 7 0 8 7 plimitpl 152 22 0 14 1 0 1 1 0 8 0 sigapl 424 361 0 330 4 0 4 4 0 8 0 futexpl 56 2000 0 2000 1 0 1 1 0 8 1 knotepl 112 73 0 54 1 0 1 1 0 8 0 kqueuepl 144 30 0 28 1 0 1 1 0 8 0 pipelkpl 48 85 0 75 1 0 1 1 0 8 0 pipepl 120 170 0 151 1 0 1 1 0 8 0 fdescpl 496 346 0 330 3 0 3 3 0 8 0 filepl 152 1905 0 1805 6 1 5 5 0 8 1 lockfpl 104 42 0 41 1 0 1 1 0 8 0 lockfspl 48 16 0 15 1 0 1 1 0 8 0 sessionpl 112 18 0 7 1 0 1 1 0 8 0 pgrppl 48 18 0 7 1 0 1 1 0 8 0 ucredpl 96 156 0 147 1 0 1 1 0 8 0 zombiepl 144 330 0 330 2 1 1 1 0 8 1 processpl 984 361 0 330 6 1 5 5 0 8 0 procpl 624 602 0 562 4 0 4 4 0 8 0 sockpl 400 279 0 260 5 1 4 4 0 8 2 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 4 0 0 1 0 1 1 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 164 0 0 20 0 20 20 0 8 0 mtagpl 96 11 0 0 1 0 1 1 0 8 0 mbufpl 256 230 0 0 14 0 14 14 0 8 0 mbufpl: pool(0xffffffff828fd788:mbufpl): free list modified: page 0xfffffd8064b5d000; item ordinal 0; addr 0xfffffd8064b5dc00 (p 0xfffffd8065684000); offset 0x0=0x0 pool(mbufpl): free list modified: page 0xfffffd8064b5d000; item ordinal 0; addr 0xfffffd8064b5dc00 (p 0xfffffd8065684000); offset 0x0=0x0 mbufpl: pool(0xffffffff828fd788:mbufpl): page inconsistency: page 0xfffffd8064b5d000; item ordinal 1; addr 0x4ca4f8e038c752ce bufpl 280 3541 0 132 244 0 244 244 0 8 0 anonpl 16 52852 0 36217 85 1 84 84 0 124 15 amapchunkpl 152 1861 0 1714 12 0 12 12 0 158 5 amappl16 192 1731 0 837 57 0 57 57 0 8 12 amappl15 184 116 0 113 3 2 1 1 0 8 0 amappl14 176 23 0 19 1 0 1 1 0 8 0 amappl13 168 31 0 27 1 0 1 1 0 8 0 amappl12 160 11 0 8 1 0 1 1 0 8 0 amappl11 152 52 0 37 1 0 1 1 0 8 0 amappl10 144 17 0 12 1 0 1 1 0 8 0 amappl9 136 372 0 371 1 0 1 1 0 8 0 amappl8 128 359 0 329 1 0 1 1 0 8 0 amappl7 120 118 0 107 1 0 1 1 0 8 0 amappl6 112 28 0 24 1 0 1 1 0 8 0 amappl5 104 270 0 252 1 0 1 1 0 8 0 amappl4 96 488 0 458 1 0 1 1 0 8 0 amappl3 88 108 0 103 1 0 1 1 0 8 0 amappl2 80 1928 0 1858 2 0 2 2 0 8 0 amappl1 72 17556 0 17113 23 12 11 18 0 8 1 amappl 80 859 0 814 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 8 0 0 1 0 1 1 0 8 0 uaddrrnd 24 348 0 330 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 348 0 330 1 0 1 1 0 8 0 vmmpekpl 168 6721 0 6687 2 0 2 2 0 8 0 vmmpepl 168 49162 0 47111 121 5 116 116 0 357 26 vmsppl 368 347 0 330 2 0 2 2 0 8 0 pdppl 4096 703 0 662 7 1 6 6 0 8 0 pvpl 32 165780 0 146017 200 0 200 200 0 265 36 pmappl 232 347 0 330 2 0 2 2 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 264 0 7 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace savectx() at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffda280, count: -1 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020d70ff0) 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_write_1(3f8,0,61) at x86_bus_space_io_write_1+0x45 sys/arch/amd64/amd64/bus_space.c:759 comcnputc(800,61) at comcnputc+0x131 bus_space_barrier machine/bus.h:481 [inline] comcnputc(800,61) at comcnputc+0x131 sys/dev/ic/com.c:1254 cnputc(61) at cnputc+0x4c sys/dev/cons.c:239 kputchar(61,5,0) at kputchar+0x219 sys/kern/subr_prf.c:343 kprintf() at kprintf+0x1b7c sys/kern/subr_prf.c:1052 panic(ffffffff823e98df) at panic+0xf3 vprintf sys/kern/subr_prf.c:528 [inline] panic(ffffffff823e98df) at panic+0xf3 sys/kern/subr_prf.c:197 pool_cache_get(ffffffff828fd788) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828fd788) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828fd788,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_copym(fffffd8064b5d000,264,580,2) at m_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline] m_copym(fffffd8064b5d000,264,580,2) at m_copym+0x174 sys/kern/uipc_mbuf.c:667 tcp_output(ffff800000ad7760) at tcp_output+0x15ba sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd806eae6af8,9,fffffd8064b5e100,0,0,ffff800020e4e4f0) at tcp_usrreq+0xa55 end trace frame: 0xffff800020e3fa50, count: 0 ddb{1}> trace x86_ipi_db(ffff800020d70ff0) 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_write_1(3f8,0,61) at x86_bus_space_io_write_1+0x45 sys/arch/amd64/amd64/bus_space.c:759 comcnputc(800,61) at comcnputc+0x131 bus_space_barrier machine/bus.h:481 [inline] comcnputc(800,61) at comcnputc+0x131 sys/dev/ic/com.c:1254 cnputc(61) at cnputc+0x4c sys/dev/cons.c:239 kputchar(61,5,0) at kputchar+0x219 sys/kern/subr_prf.c:343 kprintf() at kprintf+0x1b7c sys/kern/subr_prf.c:1052 panic(ffffffff823e98df) at panic+0xf3 vprintf sys/kern/subr_prf.c:528 [inline] panic(ffffffff823e98df) at panic+0xf3 sys/kern/subr_prf.c:197 pool_cache_get(ffffffff828fd788) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff828fd788) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff828fd788,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_copym(fffffd8064b5d000,264,580,2) at m_copym+0x174 m_get sys/kern/uipc_mbuf.c:250 [inline] m_copym(fffffd8064b5d000,264,580,2) at m_copym+0x174 sys/kern/uipc_mbuf.c:667 tcp_output(ffff800000ad7760) at tcp_output+0x15ba sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd806eae6af8,9,fffffd8064b5e100,0,0,ffff800020e4e4f0) at tcp_usrreq+0xa55 sosend(fffffd806eae6af8,0,ffff800020e3fb18,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff800020e4e4f0,4,ffff800020e3fb18,0,ffff800020e3fc00) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff800020e4e4f0,ffff800020e3fbb0,ffff800020e3fc00) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e3fc80) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e3fc80) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe0a60, count: -19