login: load: 0.10 cmd: load: 0.10 cmd: panic: m_copym0: m == NULL and not COPYALL Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 195485 27302 0 0x2 0 0 syz-executor.0 *417855 91808 0 0x12 0 1 sshd db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8243d7d4) at panic+0x15c sys/kern/subr_prf.c:207 m_copym(fffffd80687fa400,1c,294,2) at m_copym+0x5b9 sys/kern/uipc_mbuf.c:664 tcp_output(ffff800000ada980) at tcp_output+0x15ba sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd806eadfc88,9,fffffd806c7d4a00,0,0,ffff800020e40390) at tcp_usrreq+0xa55 sosend(fffffd806eadfc88,0,ffff800020e04d68,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff800020e40390,4,ffff800020e04d68,0,ffff800020e04e50) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff800020e40390,ffff800020e04e00,ffff800020e04e50) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e04ed0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e04ed0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc0ce0, 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: m == NULL and not COPYALL ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8243d7d4) at panic+0x15c sys/kern/subr_prf.c:207 m_copym(fffffd80687fa400,1c,294,2) at m_copym+0x5b9 sys/kern/uipc_mbuf.c:664 tcp_output(ffff800000ada980) at tcp_output+0x15ba sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd806eadfc88,9,fffffd806c7d4a00,0,0,ffff800020e40390) at tcp_usrreq+0xa55 sosend(fffffd806eadfc88,0,ffff800020e04d68,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff800020e40390,4,ffff800020e04d68,0,ffff800020e04e50) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff800020e40390,ffff800020e04e00,ffff800020e04e50) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e04ed0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e04ed0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc0ce0, count: -10 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020e04830 rbx 0xffff800020e048e0 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff812cad1f kprintf+0x16f r9 0x1 r10 0x2 r11 0x806410e51b4c2fa5 r12 0x3000000008 r13 0xffff800020e04840 r14 0x100 r15 0x1 rip 0xffffffff81ae9b98 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020e04820 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (sshd) pid=417855 stat=onproc flags process=12 proc=0 pri=50, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff800020e3f4f0,0xffff800020e3f020 process=0xffff8000ffffe018 user=0xffff800020dff000, vmspace=0xfffffd806e8f2178 estcpu=1, cpticks=1, pctcpu=0.3 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 95923 486496 0 0 3 0x14200 bored sosplice 36546 77175 37663 0 3 0x82 nanosleep syz-executor.1 27302 195485 37663 0 7 0x2 syz-executor.0 37663 50476 51417 0 3 0x82 thrsleep syz-fuzzer 37663 366051 51417 0 3 0x4000082 nanosleep syz-fuzzer 37663 272416 51417 0 3 0x4000082 thrsleep syz-fuzzer 37663 335592 51417 0 3 0x4000082 kqread syz-fuzzer 37663 269481 51417 0 3 0x4000082 nanosleep syz-fuzzer 37663 230078 51417 0 3 0x4000082 thrsleep syz-fuzzer 37663 112549 51417 0 3 0x4000082 thrsleep syz-fuzzer 37663 178319 51417 0 3 0x4000082 thrsleep syz-fuzzer 37663 128575 51417 0 3 0x4000082 thrsleep syz-fuzzer 37663 243669 51417 0 3 0x4000082 thrsleep syz-fuzzer 51417 22139 91808 0 3 0x10008a pause ksh *91808 417855 78661 0 7 0x12 sshd 19328 89638 1 0 3 0x100083 ttyin getty 78661 472551 1 0 3 0x80 select sshd 12885 318673 45325 74 3 0x100092 bpf pflogd 45325 360225 1 0 3 0x80 netio pflogd 8373 224845 74561 73 3 0x100090 kqread syslogd 74561 53874 1 0 3 0x100082 netio syslogd 18930 227339 1 77 3 0x100090 poll dhclient 54685 84030 1 0 3 0x80 poll dhclient 9169 298381 0 0 3 0x14200 bored smr 47315 503968 0 0 3 0x14200 pgzero zerothread 97242 273595 0 0 3 0x14200 aiodoned aiodoned 15278 502340 0 0 3 0x14200 syncer update 55334 352510 0 0 3 0x14200 cleaner cleaner 10402 176604 0 0 3 0x14200 reaper reaper 87891 425819 0 0 3 0x14200 pgdaemon pagedaemon 76853 66363 0 0 3 0x14200 bored crynlk 84908 286668 0 0 3 0x14200 bored crypto 79174 355932 0 0 3 0x40014200 acpi0 acpi0 60907 252039 0 0 3 0x40014200 idle1 6384 515915 0 0 3 0x14200 bored softnet 1289 152 0 0 3 0x14200 bored systqmp 753 144112 0 0 3 0x14200 bored systq 16375 69472 0 0 3 0x40014200 bored softclock 603 254966 0 0 3 0x40014200 idle0 1 503418 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 27302 (syz-executor.0) thread 0xffff800020dddd48 (195485) exclusive rrwlock inode r = 0 (0xfffffd806ed5f2b8) #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 (0xfffffd806b20ea28) #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 91808 (sshd) thread 0xffff800020e40390 (417855) exclusive rwlock netlock r = 0 (0xffffffff826e8c28) #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 9520 6478K 6990K 78643K 11038 0 pcb 13 8K 8K 78643K 37 0 rtable 117 6K 7K 78643K 325 0 ifaddr 70 14K 14K 78643K 99 0 counters 43 33K 33K 78643K 43 0 ioctlops 0 0K 4K 78643K 1504 0 iov 0 0K 16K 78643K 31 0 mount 1 1K 1K 78643K 1 0 vnodes 1225 77K 77K 78643K 1356 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 8 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 39 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 4 9K 25K 78643K 171 0 sigio 0 0K 0K 78643K 8 0 proc 60 63K 83K 78643K 454 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 42 0 in_multi 33 2K 2K 78643K 85 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 43 201K 201K 78643K 43 0 exec 0 0K 1K 78643K 224 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 111 38K 54K 78643K 1493 0 UVM aobj 17 2K 2K 78643K 17 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 14 0 NDP 12 0K 0K 78643K 23 0 temp 101 3861K 3925K 78643K 4152 0 kqueue 3 4K 9K 78643K 15 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 24 0 22 1 0 1 1 0 8 0 rtentry 112 67 0 24 2 0 2 2 0 8 0 unpcb 120 63 0 53 1 0 1 1 0 8 0 syncache 264 6 0 6 2 1 1 1 0 8 1 tcpqe 32 54 0 54 1 1 0 1 0 8 0 tcpcb 544 84 0 80 1 0 1 1 0 8 0 inpcb 296 268 0 261 2 0 2 2 0 8 1 nd6 48 18 0 13 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 pfstscr 40 1 0 1 1 0 1 1 0 8 1 pffrag 232 1 0 0 1 0 1 1 0 482 0 pffrnode 88 1 0 0 1 0 1 1 0 8 0 pffrent 40 2 0 1 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 34 0 28 1 0 1 1 0 8 0 pfstitem 24 18 0 3 1 0 1 1 0 8 0 pfstkey 112 20 0 5 1 0 1 1 0 8 0 pfstate 328 19 0 4 2 0 2 2 0 8 0 pfrule 1360 30 0 20 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 260 0 88 13 0 13 13 0 8 0 art_table 32 261 0 88 2 0 2 2 0 8 0 art_node 16 66 0 27 1 0 1 1 0 8 0 sysvmsgpl 40 21 0 12 1 0 1 1 0 8 0 semapl 112 37 0 27 1 0 1 1 0 8 0 shmpl 112 14 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1633 0 230 89 0 89 89 0 8 0 ffsino 272 1633 0 230 95 0 95 95 0 8 1 nchpl 144 2068 0 459 60 0 60 60 0 8 0 uvmvnodes 72 1779 0 0 33 0 33 33 0 8 0 vnodes 208 1779 0 0 94 0 94 94 0 8 0 namei 1024 5665 0 5665 1 0 1 1 0 8 1 percpumem 16 32 0 0 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 pfiaddrpl 120 11 0 8 1 0 1 1 0 8 0 scsiplug 64 1 0 1 1 0 1 1 0 8 1 scxspl 192 6105 0 6105 8 1 7 7 0 8 7 plimitpl 152 21 0 13 1 0 1 1 0 8 0 sigapl 424 387 0 356 4 0 4 4 0 8 0 futexpl 56 2383 0 2383 1 0 1 1 0 8 1 knotepl 112 72 0 53 1 0 1 1 0 8 0 kqueuepl 144 24 0 22 1 0 1 1 0 8 0 pipepl 304 91 0 81 2 0 2 2 0 8 1 fdescpl 496 371 0 356 3 0 3 3 0 8 0 filepl 152 2120 0 2020 5 0 5 5 0 8 1 lockfpl 104 53 0 52 1 0 1 1 0 8 0 lockfspl 48 22 0 21 1 0 1 1 0 8 0 sessionpl 112 18 0 7 1 0 1 1 0 8 0 pgrppl 48 24 0 13 1 0 1 1 0 8 0 ucredpl 96 263 0 254 1 0 1 1 0 8 0 zombiepl 144 356 0 355 1 0 1 1 0 8 0 processpl 992 387 0 355 5 0 5 5 0 8 0 procpl 624 713 0 672 4 0 4 4 0 8 0 sosppl 128 2 0 2 1 0 1 1 0 8 1 sockpl 400 357 0 338 4 0 4 4 0 8 2 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 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 9 0 0 2 0 2 2 0 8 0 mcl2k 2048 163 0 0 20 0 20 20 0 8 0 mtagpl 96 12 0 0 1 0 1 1 0 8 0 mbufpl 256 183 0 0 11 0 11 11 0 8 0 bufpl 280 3665 0 133 253 0 253 253 0 8 0 anonpl 16 48634 0 32340 68 1 67 67 0 124 0 amapchunkpl 152 2902 0 2757 20 0 20 20 0 158 13 amappl16 192 1485 0 614 45 0 45 45 0 8 1 amappl15 184 1 0 1 1 1 0 1 0 8 0 amappl14 176 95 0 89 1 0 1 1 0 8 0 amappl13 168 98 0 94 1 0 1 1 0 8 0 amappl12 160 77 0 73 1 0 1 1 0 8 0 amappl11 152 120 0 104 1 0 1 1 0 8 0 amappl10 144 16 0 11 1 0 1 1 0 8 0 amappl9 136 387 0 386 1 0 1 1 0 8 0 amappl8 128 337 0 308 2 0 2 2 0 8 0 amappl7 120 117 0 106 1 0 1 1 0 8 0 amappl6 112 97 0 90 1 0 1 1 0 8 0 amappl5 104 135 0 120 1 0 1 1 0 8 0 amappl4 96 621 0 594 1 0 1 1 0 8 0 amappl3 88 177 0 169 1 0 1 1 0 8 0 amappl2 80 2029 0 1964 2 0 2 2 0 8 0 amappl1 72 18111 0 17675 23 13 10 18 0 8 0 amappl 80 967 0 925 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 16 0 0 1 0 1 1 0 8 0 uaddrrnd 24 372 0 356 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 372 0 356 1 0 1 1 0 8 0 vmmpekpl 168 6916 0 6879 2 0 2 2 0 8 0 vmmpepl 168 52811 0 50872 116 5 111 112 0 357 21 vmsppl 368 371 0 356 2 0 2 2 0 8 0 pdppl 4096 751 0 713 6 0 6 6 0 8 0 pvpl 32 167987 0 148674 165 0 165 165 0 265 7 pmappl 232 371 0 356 2 0 2 2 0 8 1 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 258 0 3 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff826f9ff0) 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_cmp4(876e2,876e1) at __sanitizer_cov_trace_cmp4+0x10 sys/dev/kcov.c:134 __mp_lock(ffffffff829060a0) at __mp_lock+0x139 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829060a0) at __mp_lock+0x139 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff829060a0,1) 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(ffff800020edfdd0,1) at sleep_finish+0x113 sys/kern/kern_synch.c:418 sleep_finish_all(ffff800020edfdd0,1) at sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] sleep_finish_all(ffff800020edfdd0,1) at sleep_finish_all+0x32 sys/kern/kern_synch.c:393 tsleep(fffffd807490ab10,11,ffffffff8246f05d,0) at tsleep+0x1cc sys/kern/kern_synch.c:155 biowait(fffffd807490ab10) at biowait+0xa6 sys/kern/vfs_bio.c:1256 bwrite(fffffd807490ab10) at bwrite+0x1e4 sys/kern/vfs_bio.c:765 ufs_dirremove(fffffd80687124e0,fffffd806ed5f220,800c,1) at ufs_dirremove+0x291 ufs_rmdir(ffff800020edfff8) at ufs_rmdir+0x247 sys/ufs/ufs/ufs_vnops.c:1328 end trace frame: 0xffff800020ee0060, count: 0 ddb{0}> trace x86_ipi_db(ffffffff826f9ff0) 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_cmp4(876e2,876e1) at __sanitizer_cov_trace_cmp4+0x10 sys/dev/kcov.c:134 __mp_lock(ffffffff829060a0) at __mp_lock+0x139 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829060a0) at __mp_lock+0x139 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff829060a0,1) 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(ffff800020edfdd0,1) at sleep_finish+0x113 sys/kern/kern_synch.c:418 sleep_finish_all(ffff800020edfdd0,1) at sleep_finish_all+0x32 sleep_finish_timeout sys/kern/kern_synch.c:447 [inline] sleep_finish_all(ffff800020edfdd0,1) at sleep_finish_all+0x32 sys/kern/kern_synch.c:393 tsleep(fffffd807490ab10,11,ffffffff8246f05d,0) at tsleep+0x1cc sys/kern/kern_synch.c:155 biowait(fffffd807490ab10) at biowait+0xa6 sys/kern/vfs_bio.c:1256 bwrite(fffffd807490ab10) at bwrite+0x1e4 sys/kern/vfs_bio.c:765 ufs_dirremove(fffffd80687124e0,fffffd806ed5f220,800c,1) at ufs_dirremove+0x291 ufs_rmdir(ffff800020edfff8) at ufs_rmdir+0x247 sys/ufs/ufs/ufs_vnops.c:1328 VOP_RMDIR(fffffd80687124e0,fffffd80687a7358,ffff800020ee00f8) at VOP_RMDIR+0xf8 sys/kern/vfs_vops.c:474 dounlinkat(ffff800020dddd48,ffffff9c,7f7ffffef560,8) at dounlinkat+0x14c sys/kern/vfs_syscalls.c:1886 syscall(ffff800020ee0270) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020ee0270) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffef550, count: -18 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(ffffffff8243d7d4) at panic+0x15c sys/kern/subr_prf.c:207 m_copym(fffffd80687fa400,1c,294,2) at m_copym+0x5b9 sys/kern/uipc_mbuf.c:664 tcp_output(ffff800000ada980) at tcp_output+0x15ba sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd806eadfc88,9,fffffd806c7d4a00,0,0,ffff800020e40390) at tcp_usrreq+0xa55 sosend(fffffd806eadfc88,0,ffff800020e04d68,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff800020e40390,4,ffff800020e04d68,0,ffff800020e04e50) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff800020e40390,ffff800020e04e00,ffff800020e04e50) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e04ed0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e04ed0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc0ce0, count: 5 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8243d7d4) at panic+0x15c sys/kern/subr_prf.c:207 m_copym(fffffd80687fa400,1c,294,2) at m_copym+0x5b9 sys/kern/uipc_mbuf.c:664 tcp_output(ffff800000ada980) at tcp_output+0x15ba sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd806eadfc88,9,fffffd806c7d4a00,0,0,ffff800020e40390) at tcp_usrreq+0xa55 sosend(fffffd806eadfc88,0,ffff800020e04d68,0,0,80) at sosend+0x671 sys/kern/uipc_socket.c:555 dofilewritev(ffff800020e40390,4,ffff800020e04d68,0,ffff800020e04e50) at dofilewritev+0x1b6 sys/kern/sys_generic.c:365 sys_write(ffff800020e40390,ffff800020e04e00,ffff800020e04e50) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff800020e04ed0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800020e04ed0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc0ce0, count: -10