panic: pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd807612e500+16 0x0!=0x1cf26c588752f0cd Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 330285 92707 0 0x2 0x4000000 0K syz-fuzzer * 98285 94304 0 0x12 0 1 sshd db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8240ef1a) at panic+0x164 sys/kern/subr_prf.c:218 pool_cache_get(ffffffff82933910) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff82933910) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff82933910,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_gethdr(2,2) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 tcp_output(ffff800000ada6f0) at tcp_output+0x14e6 tcp_usrreq(fffffd806eaf3af8,9,fffffd807612fd00,0,0,ffff8000fffff648) at tcp_usrreq+0xa55 sosend(fffffd806eaf3af8,0,ffff800020e60b28,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff8000fffff648,4,ffff800020e60b28,0,ffff800020e60c10) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff8000fffff648,ffff800020e60bc0,ffff800020e60c10) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e60c90) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e60c90) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff59d0, 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{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 0xfffffd807612e500+16 0x0!=0x1cf26c588752f0cd ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8240ef1a) at panic+0x164 sys/kern/subr_prf.c:218 pool_cache_get(ffffffff82933910) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff82933910) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff82933910,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_gethdr(2,2) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 tcp_output(ffff800000ada6f0) at tcp_output+0x14e6 tcp_usrreq(fffffd806eaf3af8,9,fffffd807612fd00,0,0,ffff8000fffff648) at tcp_usrreq+0xa55 sosend(fffffd806eaf3af8,0,ffff800020e60b28,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff8000fffff648,4,ffff800020e60b28,0,ffff800020e60c10) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff8000fffff648,ffff800020e60bc0,ffff800020e60c10) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e60c90) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e60c90) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff59d0, count: -12 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020e60520 rbx 0xffff800020e605d0 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffff800020e604e0 r9 0xffffffff8108ddff kprintf+0x16f r10 0x1 r11 0xbe05071b8a27d340 r12 0x3000000008 r13 0xffff800020e60530 r14 0x100 r15 0x1 rip 0xffffffff822b91e8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020e60510 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (sshd) pid=98285 stat=onproc flags process=12 proc=0 pri=50, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffffe010,0xffff8000ffffe788 process=0xffff8000ffffcfc0 user=0xffff800020e5b000, vmspace=0xfffffd806e90fb88 estcpu=1, cpticks=2, pctcpu=0.38 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 77537 386911 56740 0 2 0 syz-executor.1 77537 253743 56740 0 3 0x4000080 poll syz-executor.1 75641 447924 0 0 3 0x14200 acct acct 36448 333498 0 0 3 0x14200 bored sosplice 56740 353973 92707 0 3 0x82 nanosleep syz-executor.1 32115 396319 92707 0 2 0x2 syz-executor.0 92707 56296 91832 0 3 0x82 thrsleep syz-fuzzer 92707 130261 91832 0 3 0x4000082 nanosleep syz-fuzzer 92707 417006 91832 0 3 0x4000082 thrsleep syz-fuzzer 92707 330285 91832 0 7 0x4000002 syz-fuzzer 92707 180567 91832 0 3 0x4000082 thrsleep syz-fuzzer 92707 443307 91832 0 3 0x4000082 nanosleep syz-fuzzer 92707 52124 91832 0 3 0x4000082 thrsleep syz-fuzzer 92707 407469 91832 0 3 0x4000082 thrsleep syz-fuzzer 91832 192658 94304 0 3 0x10008a pause ksh *94304 98285 20143 0 7 0x12 sshd 21585 373205 1 0 3 0x100083 ttyin getty 20143 332369 1 0 3 0x80 select sshd 94051 122843 27529 74 3 0x100092 bpf pflogd 27529 165530 1 0 3 0x80 netio pflogd 46173 410222 90597 73 3 0x100090 kqread syslogd 90597 458585 1 0 3 0x100082 netio syslogd 80243 410366 1 77 3 0x100090 poll dhclient 46596 326961 1 0 3 0x80 poll dhclient 33049 388745 0 0 3 0x14200 bored smr 42635 473161 0 0 3 0x14200 pgzero zerothread 79066 256996 0 0 3 0x14200 aiodoned aiodoned 17534 95017 0 0 3 0x14200 syncer update 78977 472286 0 0 3 0x14200 cleaner cleaner 27544 414359 0 0 3 0x14200 reaper reaper 66312 342800 0 0 3 0x14200 pgdaemon pagedaemon 64554 10966 0 0 3 0x14200 bored crynlk 73609 494269 0 0 3 0x14200 bored crypto 41894 89846 0 0 3 0x40014200 acpi0 acpi0 27918 243419 0 0 3 0x40014200 idle1 3449 435653 0 0 3 0x14200 bored softnet 30335 185185 0 0 3 0x14200 bored systqmp 82012 494643 0 0 3 0x14200 bored systq 39376 343448 0 0 2 0x40014200 softclock 9924 171340 0 0 3 0x40014200 idle0 1 372173 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 32115 (syz-executor.0) thread 0xffff800020dd6c60 (396319) exclusive rrwlock inode r = 0 (0xfffffd8075ff6f78) #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 vget+0x1c8 sys/kern/vfs_subr.c:671 #6 ufs_ihashget+0x141 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x74 sys/ufs/ffs/ffs_vfsops.c:1329 #8 ufs_lookup+0x14b7 sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:90 #10 vfs_lookup+0x7a6 sys/kern/vfs_lookup.c:568 #11 namei+0x63c sys/kern/vfs_lookup.c:249 #12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1853 #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 exclusive rrwlock inode r = 0 (0xfffffd8075ff6c48) #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 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1853 #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 92707 (syz-fuzzer) thread 0xffff8000fffffb38 (330285) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82933348) #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 94304 (sshd) thread 0xffff8000fffff648 (98285) exclusive rwlock netlock r = 0 (0xffffffff827713e0) #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9530 6686K 6790K 78643K 11075 0 pcb 13 8K 8K 78643K 43 0 rtable 137 11K 12K 78643K 568 0 ifaddr 87 18K 19K 78643K 2068 0 sysctl 2 0K 0K 78643K 2 0 counters 43 33K 34K 78643K 45 0 ioctlops 0 0K 4K 78643K 4827 0 iov 0 0K 16K 78643K 351 0 mount 1 1K 1K 78643K 1 0 vnodes 1221 77K 77K 78643K 1383 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 10 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 1K 78643K 61 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 5 13K 25K 78643K 2028 0 sigio 0 0K 0K 78643K 13 0 proc 61 63K 95K 78643K 459 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 112 0 in_multi 52 2K 3K 78643K 93 0 ether_multi 1 0K 0K 78643K 4 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 37 175K 175K 78643K 37 0 exec 0 0K 1K 78643K 228 0 pfkey data 0 0K 0K 78643K 2 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 204 79K 79K 78643K 6286 0 UVM aobj 42 7K 7K 78643K 42 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 19 0 NDP 11 0K 0K 78643K 23 0 temp 114 3879K 3943K 78643K 31475 0 kqueue 3 4K 9K 78643K 14 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 6 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 88 28 0 26 1 0 1 1 0 8 0 rtentry 112 61 0 19 2 0 2 2 0 8 0 unpcb 120 778 0 768 1 0 1 1 0 8 0 syncache 272 6 0 6 2 1 1 1 0 8 1 tcpqe 32 40 0 40 1 1 0 1 0 8 0 tcpcb 592 1462 0 1456 6 3 3 5 0 8 2 inpcb 296 2483 0 2474 4 2 2 2 0 8 1 nd6 48 15 0 10 1 0 1 1 0 8 0 pkpcb 40 36 0 36 2 1 1 1 0 8 1 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 17 0 15 1 0 1 1 0 482 0 pffrnode 88 17 0 15 1 0 1 1 0 8 0 pffrent 40 679 0 677 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 pfrktable 1344 147 0 132 2 0 2 2 0 8 0 pftag 88 455 0 453 1 0 1 1 0 8 0 pfstitem 24 51 0 15 1 0 1 1 0 8 0 pfstkey 112 51 0 15 2 0 2 2 0 8 0 pfstate 328 50 0 14 5 0 5 5 0 8 0 pfrule 1360 1410 0 1076 29 1 28 28 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 241 0 55 13 0 13 13 0 8 0 art_table 32 242 0 55 2 0 2 2 0 8 0 art_node 16 60 0 21 1 0 1 1 0 8 0 sysvmsgpl 40 17 0 10 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 55 0 45 1 0 1 1 0 8 0 shmpl 112 39 0 0 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 3567 0 2166 88 0 88 88 0 8 0 ffsino 272 3567 0 2166 94 0 94 94 0 8 0 nchpl 144 9897 0 8291 60 0 60 60 0 8 0 uvmvnodes 72 3710 0 0 68 0 68 68 0 8 0 vnodes 208 3710 0 0 196 0 196 196 0 8 0 namei 1024 24299 0 24299 2 1 1 1 0 8 1 percpumem 16 33 0 1 1 0 1 1 0 8 0 vcpupl 1984 5 0 0 1 0 1 1 0 8 0 vmpool 560 7 0 2 2 1 1 1 0 8 0 pfiaddrpl 120 1635 0 1557 3 0 3 3 0 8 0 scsiplug 72 1 0 1 1 1 0 1 0 8 0 scxspl 200 19491 0 19491 10 7 3 7 0 8 3 plimitpl 152 23 0 15 1 0 1 1 0 8 0 sigapl 424 2245 0 2212 4 0 4 4 0 8 0 futexpl 56 26039 0 26039 2 1 1 1 0 8 1 knotepl 112 76 0 56 1 0 1 1 0 8 0 kqueuepl 152 44 0 42 1 0 1 1 0 8 0 pipepl 304 124 0 113 3 1 2 2 0 8 1 fdescpl 496 2228 0 2212 3 0 3 3 0 8 0 filepl 152 15219 0 15113 5 0 5 5 0 8 0 lockfpl 104 97 0 96 1 0 1 1 0 8 0 lockfspl 48 33 0 32 1 0 1 1 0 8 0 sessionpl 120 18 0 7 1 0 1 1 0 8 0 pgrppl 48 1420 0 1409 1 0 1 1 0 8 0 ucredpl 96 974 0 965 1 0 1 1 0 8 0 zombiepl 144 2212 0 2212 1 0 1 1 0 8 1 processpl 1008 2245 0 2212 5 0 5 5 0 8 0 procpl 632 5419 0 5378 4 0 4 4 0 8 0 sosppl 144 5 0 5 2 1 1 1 0 8 1 sockpl 400 3335 0 3314 6 2 4 4 0 8 1 mcl64k 65536 19 0 0 3 1 2 3 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 10 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 18 0 0 3 0 3 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 196 0 0 24 0 24 24 0 8 0 mtagpl 96 32 0 0 1 0 1 1 0 8 0 mbufpl 256 294 0 0 18 0 18 18 0 8 0 bufpl 280 5847 0 127 409 0 409 409 0 8 0 anonpl 16 182443 0 164376 84 2 82 82 0 124 8 amapchunkpl 152 9887 0 9576 21 3 18 18 0 158 4 amappl16 192 8409 0 7577 43 0 43 43 0 8 1 amappl15 184 1005 0 1002 1 0 1 1 0 8 0 amappl14 176 5 0 2 1 0 1 1 0 8 0 amappl13 168 36 0 32 1 0 1 1 0 8 0 amappl12 160 21 0 18 1 0 1 1 0 8 0 amappl11 152 53 0 37 1 0 1 1 0 8 0 amappl10 144 2016 0 2009 1 0 1 1 0 8 0 amappl9 136 367 0 366 1 0 1 1 0 8 0 amappl8 128 400 0 334 3 0 3 3 0 8 0 amappl7 120 1105 0 1093 1 0 1 1 0 8 0 amappl6 112 37 0 28 1 0 1 1 0 8 0 amappl5 104 2134 0 2116 1 0 1 1 0 8 0 amappl4 96 493 0 466 1 0 1 1 0 8 0 amappl3 88 141 0 132 1 0 1 1 0 8 0 amappl2 80 19340 0 19262 2 0 2 2 0 8 0 amappl1 72 64402 0 63954 23 13 10 18 0 8 0 amappl 80 5728 0 5636 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 41 0 0 1 0 1 1 0 8 0 uaddrrnd 24 2235 0 2214 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2235 0 2214 1 0 1 1 0 8 0 vmmpekpl 168 14705 0 14667 2 0 2 2 0 8 0 vmmpepl 168 277403 0 275298 119 20 99 112 0 357 3 vmsppl 368 2234 0 2214 2 0 2 2 0 8 0 pdppl 4096 4477 0 4433 7 1 6 6 0 8 0 pvpl 32 570474 0 549214 198 4 194 194 0 265 20 pmappl 232 2234 0 2214 3 1 2 2 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 301 0 9 9 0 9 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff82785ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x6f sys/dev/kcov.c:118 kqueue_sleep(fffffd806e8e4d10,ffff800020e88130) at kqueue_sleep+0x101 sys/kern/kern_event.c:885 kqueue_scan(fffffd806e8e4d10,40,c000049638,ffff800020e88130,ffff8000fffffb38,ffff800020e8817c) at kqueue_scan+0x2b6 sys/kern/kern_event.c:928 sys_kevent(ffff8000fffffb38,ffff800020e881f0,ffff800020e88240) at sys_kevent+0x464 sys/kern/kern_event.c:640 syscall(ffff800020e882c0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e882c0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc000049e38, count: 6 ddb{0}> trace x86_ipi_db(ffffffff82785ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x6f sys/dev/kcov.c:118 kqueue_sleep(fffffd806e8e4d10,ffff800020e88130) at kqueue_sleep+0x101 sys/kern/kern_event.c:885 kqueue_scan(fffffd806e8e4d10,40,c000049638,ffff800020e88130,ffff8000fffffb38,ffff800020e8817c) at kqueue_scan+0x2b6 sys/kern/kern_event.c:928 sys_kevent(ffff8000fffffb38,ffff800020e881f0,ffff800020e88240) at sys_kevent+0x464 sys/kern/kern_event.c:640 syscall(ffff800020e882c0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e882c0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc000049e38, count: -9 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x18: addq $0x8,%rsp db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8240ef1a) at panic+0x164 sys/kern/subr_prf.c:218 pool_cache_get(ffffffff82933910) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff82933910) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff82933910,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_gethdr(2,2) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 tcp_output(ffff800000ada6f0) at tcp_output+0x14e6 tcp_usrreq(fffffd806eaf3af8,9,fffffd807612fd00,0,0,ffff8000fffff648) at tcp_usrreq+0xa55 sosend(fffffd806eaf3af8,0,ffff800020e60b28,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff8000fffff648,4,ffff800020e60b28,0,ffff800020e60c10) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff8000fffff648,ffff800020e60bc0,ffff800020e60c10) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e60c90) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e60c90) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff59d0, count: 3 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8240ef1a) at panic+0x164 sys/kern/subr_prf.c:218 pool_cache_get(ffffffff82933910) at pool_cache_get+0x323 pool_cache_item_magic_check sys/kern/subr_pool.c:1781 [inline] pool_cache_get(ffffffff82933910) at pool_cache_get+0x323 sys/kern/subr_pool.c:1884 pool_get(ffffffff82933910,2) at pool_get+0x91 sys/kern/subr_pool.c:572 m_gethdr(2,2) at m_gethdr+0x4c sys/kern/uipc_mbuf.c:283 tcp_output(ffff800000ada6f0) at tcp_output+0x14e6 tcp_usrreq(fffffd806eaf3af8,9,fffffd807612fd00,0,0,ffff8000fffff648) at tcp_usrreq+0xa55 sosend(fffffd806eaf3af8,0,ffff800020e60b28,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff8000fffff648,4,ffff800020e60b28,0,ffff800020e60c10) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff8000fffff648,ffff800020e60bc0,ffff800020e60c10) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e60c90) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e60c90) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff59d0, count: -12