ڝ^E3ZݥaaXı,8=h%3G2Vipanic: m_copym0: short mbuf chain Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 94949 64782 0 0x2 0 0 syz-executor.1 *261643 53954 0 0x12 0 1 sshd db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821e8108) at panic+0x15c sys/kern/subr_prf.c:207 m_copym(fffffd806a0a9300,37c,14c,2) at m_copym+0x583 sys/kern/uipc_mbuf.c:695 tcp_output(ffff800000a0b100) at tcp_output+0x15ba sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd806eb3faf8,9,fffffd806d8b8600,0,0,ffff800020ed0eb0) at tcp_usrreq+0xa55 sosend(fffffd806eb3faf8,0,ffff800020ed76c8,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:549 dofilewritev(ffff800020ed0eb0,4,ffff800020ed76c8,0,ffff800020ed77b0) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff800020ed0eb0,ffff800020ed7760,ffff800020ed77b0) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020ed7830) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020ed7830) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffeee60, count: 5 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 m_copym0: short mbuf chain ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821e8108) at panic+0x15c sys/kern/subr_prf.c:207 m_copym(fffffd806a0a9300,37c,14c,2) at m_copym+0x583 sys/kern/uipc_mbuf.c:695 tcp_output(ffff800000a0b100) at tcp_output+0x15ba sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd806eb3faf8,9,fffffd806d8b8600,0,0,ffff800020ed0eb0) at tcp_usrreq+0xa55 sosend(fffffd806eb3faf8,0,ffff800020ed76c8,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:549 dofilewritev(ffff800020ed0eb0,4,ffff800020ed76c8,0,ffff800020ed77b0) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff800020ed0eb0,ffff800020ed7760,ffff800020ed77b0) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020ed7830) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020ed7830) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffeee60, count: -10 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020ed7190 rbx 0xffff800020ed7240 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff8210a11f kprintf+0x16f r9 0x1 r10 0x2 r11 0xe2db84b9bf44a048 r12 0x3000000008 r13 0xffff800020ed71a0 r14 0x100 r15 0x1 rip 0xffffffff81d8fc68 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020ed7180 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (sshd) pid=261643 stat=onproc flags process=12 proc=0 pri=50, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020ed0760,0xffff800020ed1d60 process=0xffff800020ec8018 user=0xffff800020ed2000, vmspace=0xfffffd806e952a18 estcpu=0, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 83155 165566 10798 0 3 0x80 nanosleep syz-executor.0 83155 401061 10798 0 3 0x4000080 ttyout syz-executor.0 27623 389524 0 0 3 0x14200 bored sosplice 64782 94949 94773 0 7 0x2 syz-executor.1 10798 352683 94773 0 3 0x82 nanosleep syz-executor.0 94773 51806 76026 0 3 0x82 thrsleep syz-fuzzer 94773 137363 76026 0 3 0x4000082 nanosleep syz-fuzzer 94773 467924 76026 0 3 0x4000082 thrsleep syz-fuzzer 94773 371505 76026 0 3 0x4000082 kqread syz-fuzzer 94773 95023 76026 0 3 0x4000082 thrsleep syz-fuzzer 94773 82277 76026 0 3 0x4000082 thrsleep syz-fuzzer 94773 211817 76026 0 3 0x4000082 thrsleep syz-fuzzer 94773 409837 76026 0 3 0x4000082 thrsleep syz-fuzzer 94773 233349 76026 0 3 0x4000082 nanosleep syz-fuzzer 94773 206897 76026 0 3 0x4000082 thrsleep syz-fuzzer 76026 331918 53954 0 3 0x10008a pause ksh *53954 261643 49999 0 7 0x12 sshd 82042 511660 1 0 3 0x100083 ttyin getty 49999 99905 1 0 3 0x80 select sshd 31386 249557 99590 74 3 0x100092 bpf pflogd 99590 303759 1 0 3 0x80 netio pflogd 68088 112768 48548 73 3 0x100090 kqread syslogd 48548 252815 1 0 3 0x100082 netio syslogd 41838 68083 1 77 3 0x100090 poll dhclient 21059 290304 1 0 3 0x80 poll dhclient 76021 484908 0 0 3 0x14200 bored smr 1066 284796 0 0 3 0x14200 pgzero zerothread 46841 363143 0 0 3 0x14200 aiodoned aiodoned 82249 156232 0 0 3 0x14200 syncer update 63019 9053 0 0 3 0x14200 cleaner cleaner 85169 109282 0 0 3 0x14200 reaper reaper 68477 503822 0 0 3 0x14200 pgdaemon pagedaemon 93716 15982 0 0 3 0x14200 bored crynlk 85141 486274 0 0 3 0x14200 bored crypto 67848 477079 0 0 3 0x40014200 acpi0 acpi0 90341 309711 0 0 3 0x40014200 idle1 58223 497730 0 0 3 0x14200 bored softnet 11730 280606 0 0 3 0x14200 bored systqmp 14622 100092 0 0 3 0x14200 bored systq 45716 2622 0 0 3 0x40014200 bored softclock 21980 204546 0 0 3 0x40014200 idle0 1 370331 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 64782 (syz-executor.1) thread 0xffff800020e6d388 (94949) exclusive rrwlock inode r = 0 (0xfffffd8069410920) #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 (0xfffffd806b3151a8) #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 53954 (sshd) thread 0xffff800020ed0eb0 (261643) exclusive rwlock netlock r = 0 (0xffffffff824b44a8) #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9525 6607K 7249K 78643K 11193 0 pcb 13 8K 8K 78643K 33 0 rtable 105 3K 3K 78643K 233 0 ifaddr 71 14K 15K 78643K 88 0 counters 43 33K 34K 78643K 49 0 ioctlops 0 0K 4K 78643K 1477 0 iov 0 0K 16K 78643K 20 0 mount 1 1K 1K 78643K 1 0 vnodes 1228 77K 77K 78643K 1373 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 0K 1K 78643K 16 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 5 13K 25K 78643K 132 0 proc 61 63K 95K 78643K 443 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 6 0 in_multi 53 3K 3K 78643K 64 0 ether_multi 1 0K 0K 78643K 6 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 211 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 127 39K 39K 78643K 1360 0 UVM aobj 6 4K 5K 78643K 8 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 11 0K 0K 78643K 18 0 temp 92 3033K 3144K 78643K 13877 0 kqueue 3 4K 8K 78643K 10 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 80 22 0 20 1 0 1 1 0 8 0 rtentry 112 46 0 2 2 0 2 2 0 8 0 unpcb 120 83 0 73 1 0 1 1 0 8 0 syncache 264 7 0 7 2 1 1 1 0 8 1 tcpqe 32 761 0 761 1 0 1 1 0 8 1 tcpcb 544 53 0 49 1 0 1 1 0 8 0 inpcb 280 148 0 141 2 0 2 2 0 8 1 nd6 48 7 0 1 1 0 1 1 0 8 0 pkpcb 40 2 0 2 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 2 0 2 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 19 0 2 1 0 1 1 0 8 0 pfstkey 112 19 0 2 1 0 1 1 0 8 0 pfstate 328 19 0 2 2 0 2 2 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 256 203 0 15 13 0 13 13 0 8 1 art_table 32 204 0 15 2 0 2 2 0 8 0 art_node 16 45 0 5 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 1 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 10 0 0 1 0 1 1 0 8 0 shmpl 112 6 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1596 0 187 89 0 89 89 0 8 0 ffsino 272 1596 0 187 95 0 95 95 0 8 0 nchpl 144 1970 0 360 60 0 60 60 0 8 0 uvmvnodes 72 1778 0 0 33 0 33 33 0 8 0 vnodes 208 1778 0 0 94 0 94 94 0 8 0 namei 1024 5283 0 5283 1 0 1 1 0 8 1 percpumem 16 35 0 3 1 0 1 1 0 8 0 vcpupl 1984 2 0 0 1 0 1 1 0 8 0 vmpool 560 4 0 2 1 0 1 1 0 8 0 scxspl 192 5442 0 5442 8 3 5 7 0 8 5 plimitpl 152 19 0 11 1 0 1 1 0 8 0 sigapl 424 348 0 316 4 0 4 4 0 8 0 futexpl 56 1786 0 1786 1 0 1 1 0 8 1 knotepl 112 72 0 53 1 0 1 1 0 8 0 kqueuepl 144 14 0 10 1 0 1 1 0 8 0 pipelkpl 48 92 0 82 1 0 1 1 0 8 0 pipepl 120 184 0 165 1 0 1 1 0 8 0 fdescpl 496 332 0 316 3 0 3 3 0 8 0 filepl 152 1852 0 1750 5 0 5 5 0 8 0 lockfpl 104 33 0 31 1 0 1 1 0 8 0 lockfspl 48 13 0 11 1 0 1 1 0 8 0 sessionpl 112 18 0 7 1 0 1 1 0 8 0 pgrppl 48 20 0 9 1 0 1 1 0 8 0 ucredpl 96 83 0 74 1 0 1 1 0 8 0 zombiepl 144 316 0 316 1 0 1 1 0 8 1 processpl 984 348 0 316 5 0 5 5 0 8 0 procpl 624 581 0 539 4 0 4 4 0 8 0 sosppl 128 2 0 2 1 0 1 1 0 8 1 sockpl 400 255 0 236 4 0 4 4 0 8 2 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 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 214 0 0 26 0 26 26 0 8 0 mtagpl 80 8 0 0 1 0 1 1 0 8 0 mbufpl 256 244 0 0 15 0 15 15 0 8 0 bufpl 280 3650 0 133 252 0 252 252 0 8 0 anonpl 16 44268 0 29914 61 1 60 60 0 124 2 amapchunkpl 152 1603 0 1473 7 1 6 7 0 158 0 amappl16 192 1351 0 583 41 0 41 41 0 8 2 amappl15 184 58 0 55 1 0 1 1 0 8 0 amappl14 176 32 0 24 1 0 1 1 0 8 0 amappl13 168 31 0 27 1 0 1 1 0 8 0 amappl12 160 15 0 13 1 0 1 1 0 8 0 amappl11 152 52 0 37 1 0 1 1 0 8 0 amappl10 144 21 0 13 1 0 1 1 0 8 0 amappl9 136 432 0 429 1 0 1 1 0 8 0 amappl8 128 420 0 381 2 0 2 2 0 8 0 amappl7 120 120 0 107 1 0 1 1 0 8 0 amappl6 112 24 0 22 1 0 1 1 0 8 0 amappl5 104 234 0 218 1 0 1 1 0 8 0 amappl4 96 498 0 465 1 0 1 1 0 8 0 amappl3 88 110 0 105 1 0 1 1 0 8 0 amappl2 80 1747 0 1677 2 0 2 2 0 8 0 amappl1 72 17456 0 17025 23 13 10 18 0 8 0 amappl 80 831 0 788 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 2 1 0 1 1 0 8 0 uaddrrnd 24 336 0 318 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 336 0 318 1 0 1 1 0 8 0 vmmpekpl 168 6510 0 6475 2 0 2 2 0 8 0 vmmpepl 168 47212 0 45285 108 7 101 104 0 357 14 vmsppl 368 335 0 318 2 0 2 2 0 8 0 pdppl 4096 680 0 638 6 0 6 6 0 8 0 pvpl 32 157195 0 139705 152 0 152 152 0 265 9 pmappl 232 335 0 318 2 0 2 2 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 268 0 3 9 1 8 9 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff824b2ff0) 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 __mp_lock(ffffffff8268a268) at __mp_lock+0x127 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff8268a268) at __mp_lock+0x127 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff8268a268,1) at __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 mi_switch() at mi_switch+0x392 sys/kern/sched_bsd.c:435 sleep_finish(ffff800022d89370,1) at sleep_finish+0x113 sys/kern/kern_synch.c:418 sleep_finish_all(ffff800022d89370,1) at sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] sleep_finish_all(ffff800022d89370,1) at sleep_finish_all+0x32 sys/kern/kern_synch.c:393 tsleep(fffffd8068dd2d20,11,ffffffff82253c9d,0) at tsleep+0x1cc sys/kern/kern_synch.c:155 biowait(fffffd8068dd2d20) at biowait+0xa6 sys/kern/vfs_bio.c:1256 bwrite(fffffd8068dd2d20) at bwrite+0x1e4 sys/kern/vfs_bio.c:765 ufs_dirremove(fffffd8068f96758,fffffd8069410888,800c,1) at ufs_dirremove+0x291 ufs_rmdir(ffff800022d89598) at ufs_rmdir+0x247 sys/ufs/ufs/ufs_vnops.c:1328 VOP_RMDIR(fffffd8068f96758,fffffd806528b0e8,ffff800022d89698) at VOP_RMDIR+0xf8 sys/kern/vfs_vops.c:474 end trace frame: 0xffff800022d89730, count: 0 ddb{0}> trace x86_ipi_db(ffffffff824b2ff0) 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 __mp_lock(ffffffff8268a268) at __mp_lock+0x127 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff8268a268) at __mp_lock+0x127 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff8268a268,1) at __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 mi_switch() at mi_switch+0x392 sys/kern/sched_bsd.c:435 sleep_finish(ffff800022d89370,1) at sleep_finish+0x113 sys/kern/kern_synch.c:418 sleep_finish_all(ffff800022d89370,1) at sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] sleep_finish_all(ffff800022d89370,1) at sleep_finish_all+0x32 sys/kern/kern_synch.c:393 tsleep(fffffd8068dd2d20,11,ffffffff82253c9d,0) at tsleep+0x1cc sys/kern/kern_synch.c:155 biowait(fffffd8068dd2d20) at biowait+0xa6 sys/kern/vfs_bio.c:1256 bwrite(fffffd8068dd2d20) at bwrite+0x1e4 sys/kern/vfs_bio.c:765 ufs_dirremove(fffffd8068f96758,fffffd8069410888,800c,1) at ufs_dirremove+0x291 ufs_rmdir(ffff800022d89598) at ufs_rmdir+0x247 sys/ufs/ufs/ufs_vnops.c:1328 VOP_RMDIR(fffffd8068f96758,fffffd806528b0e8,ffff800022d89698) at VOP_RMDIR+0xf8 sys/kern/vfs_vops.c:474 dounlinkat(ffff800020e6d388,ffffff9c,7f7ffffceea0,8) at dounlinkat+0x14c sys/kern/vfs_syscalls.c:1886 syscall(ffff800022d89810) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800022d89810) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffcee90, count: -17 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(ffffffff821e8108) at panic+0x15c sys/kern/subr_prf.c:207 m_copym(fffffd806a0a9300,37c,14c,2) at m_copym+0x583 sys/kern/uipc_mbuf.c:695 tcp_output(ffff800000a0b100) at tcp_output+0x15ba sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd806eb3faf8,9,fffffd806d8b8600,0,0,ffff800020ed0eb0) at tcp_usrreq+0xa55 sosend(fffffd806eb3faf8,0,ffff800020ed76c8,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:549 dofilewritev(ffff800020ed0eb0,4,ffff800020ed76c8,0,ffff800020ed77b0) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff800020ed0eb0,ffff800020ed7760,ffff800020ed77b0) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020ed7830) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020ed7830) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffeee60, count: 5 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff821e8108) at panic+0x15c sys/kern/subr_prf.c:207 m_copym(fffffd806a0a9300,37c,14c,2) at m_copym+0x583 sys/kern/uipc_mbuf.c:695 tcp_output(ffff800000a0b100) at tcp_output+0x15ba sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd806eb3faf8,9,fffffd806d8b8600,0,0,ffff800020ed0eb0) at tcp_usrreq+0xa55 sosend(fffffd806eb3faf8,0,ffff800020ed76c8,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:549 dofilewritev(ffff800020ed0eb0,4,ffff800020ed76c8,0,ffff800020ed77b0) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff800020ed0eb0,ffff800020ed7760,ffff800020ed77b0) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020ed7830) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020ed7830) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffeee60, count: -10