login: panic: m_copym0: m == NULL and not COPYALL Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 86178 19051 0 0x12 0 0 sshd db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8241a7af) at panic+0x15c sys/kern/subr_prf.c:207 m_copym(fffffd806b6dd400,1dc,2ec,2) at m_copym+0x589 sys/kern/uipc_mbuf.c:664 tcp_output(ffff800000ac2980) at tcp_output+0x154d sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd805da61328,9,fffffd806b6dd300,0,0,ffff80001d717c40) at tcp_usrreq+0xa54 sosend(fffffd805da61328,0,ffff80001d6cab28,0,0,80) at sosend+0x669 sys/kern/uipc_socket.c:555 dofilewritev(ffff80001d717c40,4,ffff80001d6cab28,0,ffff80001d6cac10) at dofilewritev+0x1ab sys/kern/sys_generic.c:365 sys_write(ffff80001d717c40,ffff80001d6cabc0,ffff80001d6cac10) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff80001d6cac90) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffeaff0, 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic m_copym0: m == NULL and not COPYALL ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8241a7af) at panic+0x15c sys/kern/subr_prf.c:207 m_copym(fffffd806b6dd400,1dc,2ec,2) at m_copym+0x589 sys/kern/uipc_mbuf.c:664 tcp_output(ffff800000ac2980) at tcp_output+0x154d sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd805da61328,9,fffffd806b6dd300,0,0,ffff80001d717c40) at tcp_usrreq+0xa54 sosend(fffffd805da61328,0,ffff80001d6cab28,0,0,80) at sosend+0x669 sys/kern/uipc_socket.c:555 dofilewritev(ffff80001d717c40,4,ffff80001d6cab28,0,ffff80001d6cac10) at dofilewritev+0x1ab sys/kern/sys_generic.c:365 sys_write(ffff80001d717c40,ffff80001d6cabc0,ffff80001d6cac10) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff80001d6cac90) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffeaff0, count: -10 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80001d6ca5f0 rbx 0xffff80001d6ca6a0 rdx 0x2 rcx 0 rax 0x1 r8 0xffffffff81843c1f kprintf+0x15f r9 0x1 r10 0x2 r11 0xbc8d39aaafcc8a86 r12 0x3000000008 r13 0xffff80001d6ca600 r14 0x100 r15 0x1 rip 0xffffffff8234ada8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001d6ca5e0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (sshd) pid=86178 stat=onproc flags process=12 proc=0 pri=24, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff80001d718ae0,0xffff80001d717770 process=0xffff8000ffff8748 user=0xffff80001d6c5000, vmspace=0xfffffd806bc0a770 estcpu=0, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 72270 290225 21785 0 2 0x2 syz-executor.0 34615 30698 21785 0 2 0x2 syz-executor.1 21785 408539 45188 0 3 0x82 thrsleep syz-fuzzer 21785 111223 45188 0 2 0x4000002 syz-fuzzer 21785 34972 45188 0 3 0x4000082 thrsleep syz-fuzzer 21785 371645 45188 0 3 0x4000082 thrsleep syz-fuzzer 21785 283107 45188 0 3 0x4000082 thrsleep syz-fuzzer 21785 305913 45188 0 2 0x4000002 syz-fuzzer 21785 242962 45188 0 3 0x4000082 thrsleep syz-fuzzer 45188 373480 19051 0 3 0x10008a pause ksh *19051 86178 16368 0 7 0x12 sshd 33780 365861 1 0 3 0x100083 ttyin getty 16368 381311 1 0 3 0x80 select sshd 96892 508141 19389 73 3 0x100090 kqread syslogd 19389 522924 1 0 3 0x100082 netio syslogd 36759 308734 1 77 3 0x100090 poll dhclient 62860 52317 1 0 3 0x80 poll dhclient 19871 189649 0 0 3 0x14200 bored smr 87479 509203 0 0 2 0x14200 zerothread 62126 276522 0 0 3 0x14200 aiodoned aiodoned 73451 208232 0 0 3 0x14200 syncer update 46509 429138 0 0 3 0x14200 cleaner cleaner 52302 357128 0 0 3 0x14200 reaper reaper 43263 129433 0 0 3 0x14200 pgdaemon pagedaemon 7639 250102 0 0 3 0x14200 bored crynlk 31261 79883 0 0 3 0x14200 bored crypto 94004 137915 0 0 3 0x40014200 acpi0 acpi0 84900 241389 0 0 3 0x14200 bored softnet 15250 73089 0 0 3 0x14200 bored systqmp 78846 220755 0 0 3 0x14200 bored systq 51647 410785 0 0 3 0x40014200 bored softclock 60217 67371 0 0 3 0x40014200 idle0 1 501259 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9457 6327K 6909K 78643K 10683 0 pcb 13 8K 8K 78643K 27 0 rtable 97 2K 3K 78643K 209 0 ifaddr 45 10K 12K 78643K 62 0 counters 21 16K 16K 78643K 22 0 ioctlops 0 0K 4K 78643K 27 0 iov 0 0K 12K 78643K 8 0 mount 1 1K 1K 78643K 1 0 vnodes 1221 77K 77K 78643K 1252 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 0K 0K 78643K 2 0 sem 8 0K 0K 78643K 8 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 195K 288K 78643K 12938 0 file desc 4 9K 25K 78643K 68 0 proc 48 38K 63K 78643K 359 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 39 2K 2K 78643K 41 0 ether_multi 1 0K 0K 78643K 1 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 181 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 120 23K 23K 78643K 993 0 UVM aobj 7 2K 2K 78643K 8 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 8 0 NDP 10 0K 0K 78643K 11 0 temp 66 3847K 3912K 78643K 2052 0 kqueue 3 4K 6K 78643K 4 0 SYN cache 2 16K 16K 78643K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 7 0 3 1 0 1 1 0 8 0 rtpcb 80 19 0 17 1 0 1 1 0 8 0 rtentry 112 48 0 8 2 0 2 2 0 8 0 unpcb 120 29 0 21 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 85 0 85 1 0 1 1 0 8 1 tcpcb 544 28 0 24 1 0 1 1 0 8 0 inpcb 296 76 0 69 2 0 2 2 0 8 1 nd6 48 6 0 0 1 0 1 1 0 8 0 pfosfp 40 1 0 0 1 0 1 1 0 8 0 pfosfpen 112 1 0 0 1 0 1 1 0 8 0 pfrule 1360 2 0 2 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 195 0 11 12 0 12 12 0 8 0 art_table 32 196 0 11 2 0 2 2 0 8 0 art_node 16 47 0 11 1 0 1 1 0 8 0 semapl 112 6 0 0 1 0 1 1 0 8 0 shmpl 112 6 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1469 0 74 88 0 88 88 0 8 0 ffsino 240 1469 0 74 83 0 83 83 0 8 0 nchpl 144 1733 0 145 60 0 60 60 0 8 0 uvmvnodes 72 1538 0 0 28 0 28 28 0 8 0 vnodes 208 1538 0 0 81 0 81 81 0 8 0 namei 1024 4322 0 4322 1 0 1 1 0 8 1 scxspl 192 5375 0 5375 1 0 1 1 0 8 1 plimitpl 152 14 0 7 1 0 1 1 0 8 0 sigapl 424 254 0 227 4 0 4 4 0 8 0 futexpl 56 741 0 741 1 0 1 1 0 8 1 knotepl 112 62 0 43 1 0 1 1 0 8 0 kqueuepl 144 8 0 6 1 0 1 1 0 8 0 pipelkpl 16 74 0 64 1 0 1 1 0 8 0 pipepl 120 148 0 129 1 0 1 1 0 8 0 fdescpl 432 240 0 227 2 0 2 2 0 8 0 filepl 120 1208 0 1113 4 0 4 4 0 8 1 lockfpl 104 34 0 33 1 0 1 1 0 8 0 lockfspl 48 13 0 12 1 0 1 1 0 8 0 sessionpl 112 17 0 7 1 0 1 1 0 8 0 pgrppl 48 17 0 7 1 0 1 1 0 8 0 ucredpl 96 60 0 53 1 0 1 1 0 8 0 zombiepl 144 227 0 227 1 0 1 1 0 8 1 processpl 920 254 0 227 4 0 4 4 0 8 0 procpl 624 301 0 268 4 0 4 4 0 8 1 sockpl 400 124 0 107 3 0 3 3 0 8 1 mcl64k 65536 3 0 3 1 0 1 1 0 8 1 mcl12k 12288 2 0 2 1 0 1 1 0 8 1 mcl9k 9216 1 0 1 1 0 1 1 0 8 1 mcl4k 4096 15 0 15 2 1 1 1 0 8 1 mcl2k 2048 72909 0 72859 16 2 14 14 0 8 7 mtagpl 96 15 0 2 2 1 1 1 0 8 0 mbufpl 256 115838 0 115732 11 2 9 9 0 8 1 bufpl 280 3513 0 126 242 0 242 242 0 8 0 anonpl 16 37883 0 23344 62 2 60 60 0 107 0 amapchunkpl 152 1100 0 973 8 0 8 8 0 158 2 amappl16 192 1048 0 254 41 0 41 41 0 8 0 amappl15 184 19 0 17 1 0 1 1 0 8 0 amappl14 176 40 0 35 1 0 1 1 0 8 0 amappl13 168 28 0 25 1 0 1 1 0 8 0 amappl12 160 28 0 26 1 0 1 1 0 8 0 amappl11 152 67 0 57 1 0 1 1 0 8 0 amappl10 144 11 0 6 1 0 1 1 0 8 0 amappl9 136 366 0 365 1 0 1 1 0 8 0 amappl8 128 321 0 282 2 0 2 2 0 8 0 amappl7 120 106 0 95 1 0 1 1 0 8 0 amappl6 112 38 0 35 1 0 1 1 0 8 0 amappl5 104 179 0 167 1 0 1 1 0 8 0 amappl4 96 434 0 408 1 0 1 1 0 8 0 amappl3 88 105 0 99 1 0 1 1 0 8 0 amappl2 80 1112 0 1051 2 0 2 2 0 8 0 amappl1 72 13897 0 13503 23 6 17 17 0 8 7 amappl 80 518 0 480 1 0 1 1 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 1 1 0 1 1 0 8 0 uaddrrnd 24 240 0 227 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 240 0 227 1 0 1 1 0 8 0 vmmpekpl 168 5847 0 5823 2 0 2 2 0 8 0 vmmpepl 168 36274 0 34511 114 6 108 108 0 357 27 vmsppl 272 239 0 227 2 0 2 2 0 8 1 pdppl 4096 486 0 454 6 0 6 6 0 8 1 pvpl 32 130651 0 113232 147 0 147 147 0 265 4 pmappl 200 239 0 227 1 0 1 1 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 237 0 7 7 0 7 7 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8241a7af) at panic+0x15c sys/kern/subr_prf.c:207 m_copym(fffffd806b6dd400,1dc,2ec,2) at m_copym+0x589 sys/kern/uipc_mbuf.c:664 tcp_output(ffff800000ac2980) at tcp_output+0x154d sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd805da61328,9,fffffd806b6dd300,0,0,ffff80001d717c40) at tcp_usrreq+0xa54 sosend(fffffd805da61328,0,ffff80001d6cab28,0,0,80) at sosend+0x669 sys/kern/uipc_socket.c:555 dofilewritev(ffff80001d717c40,4,ffff80001d6cab28,0,ffff80001d6cac10) at dofilewritev+0x1ab sys/kern/sys_generic.c:365 sys_write(ffff80001d717c40,ffff80001d6cabc0,ffff80001d6cac10) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff80001d6cac90) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffeaff0, count: -10 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8241a7af) at panic+0x15c sys/kern/subr_prf.c:207 m_copym(fffffd806b6dd400,1dc,2ec,2) at m_copym+0x589 sys/kern/uipc_mbuf.c:664 tcp_output(ffff800000ac2980) at tcp_output+0x154d sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd805da61328,9,fffffd806b6dd300,0,0,ffff80001d717c40) at tcp_usrreq+0xa54 sosend(fffffd805da61328,0,ffff80001d6cab28,0,0,80) at sosend+0x669 sys/kern/uipc_socket.c:555 dofilewritev(ffff80001d717c40,4,ffff80001d6cab28,0,ffff80001d6cac10) at dofilewritev+0x1ab sys/kern/sys_generic.c:365 sys_write(ffff80001d717c40,ffff80001d6cabc0,ffff80001d6cac10) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff80001d6cac90) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffeaff0, count: -10