panic: m_copym0: m == NULL and not COPYALL Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *351152 12953 0 0x12 0 0 sshd db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82422f01) at panic+0x164 sys/kern/subr_prf.c:218 m_copym(fffffd805e206700,2a4,3b4,2) at m_copym+0x589 sys/kern/uipc_mbuf.c:664 tcp_output(ffff800000ac5280) at tcp_output+0x154d sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd805da73328,9,fffffd805e206600,0,0,ffff80001d702c68) at tcp_usrreq+0xa54 sosend(fffffd805da73328,0,ffff80001d71f138,0,0,80) at sosend+0x669 sys/kern/uipc_socket.c:555 dofilewritev(ffff80001d702c68,4,ffff80001d71f138,0,ffff80001d71f220) at dofilewritev+0x1ab sys/kern/sys_generic.c:365 sys_write(ffff80001d702c68,ffff80001d71f1d0,ffff80001d71f220) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff80001d71f2a0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe35b0, 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(ffffffff82422f01) at panic+0x164 sys/kern/subr_prf.c:218 m_copym(fffffd805e206700,2a4,3b4,2) at m_copym+0x589 sys/kern/uipc_mbuf.c:664 tcp_output(ffff800000ac5280) at tcp_output+0x154d sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd805da73328,9,fffffd805e206600,0,0,ffff80001d702c68) at tcp_usrreq+0xa54 sosend(fffffd805da73328,0,ffff80001d71f138,0,0,80) at sosend+0x669 sys/kern/uipc_socket.c:555 dofilewritev(ffff80001d702c68,4,ffff80001d71f138,0,ffff80001d71f220) at dofilewritev+0x1ab sys/kern/sys_generic.c:365 sys_write(ffff80001d702c68,ffff80001d71f1d0,ffff80001d71f220) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff80001d71f2a0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe35b0, count: -10 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80001d71ec00 rbx 0xffff80001d71ecb0 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffff80001d71ebc0 r9 0xffffffff821f998f kprintf+0x15f r10 0x1 r11 0xa1a2fd528d914d70 r12 0x3000000008 r13 0xffff80001d71ec10 r14 0x100 r15 0x1 rip 0xffffffff81589c68 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001d71ebf0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (sshd) pid=351152 stat=onproc flags process=12 proc=0 pri=24, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff80001d703158,0xffff80001d702510 process=0xffff80001d705288 user=0xffff80001d71a000, vmspace=0xfffffd806bc0a990 estcpu=0, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 16701 289632 33579 0 2 0 syz-executor.1 16701 440120 33579 0 3 0x4000080 poll syz-executor.1 66557 31019 92797 0 2 0x2 syz-executor.0 33579 320241 92797 0 3 0x82 nanosleep syz-executor.1 13161 149211 0 0 3 0x14200 bored sosplice 92797 207261 61139 0 3 0x82 thrsleep syz-fuzzer 92797 393864 61139 0 2 0x4000002 syz-fuzzer 92797 102625 61139 0 3 0x4000082 thrsleep syz-fuzzer 92797 325866 61139 0 3 0x4000082 thrsleep syz-fuzzer 92797 271945 61139 0 3 0x4000082 thrsleep syz-fuzzer 92797 512710 61139 0 2 0x4000002 syz-fuzzer 92797 389115 61139 0 3 0x4000082 thrsleep syz-fuzzer 61139 177685 12953 0 3 0x10008a pause ksh *12953 351152 2701 0 7 0x12 sshd 3660 234337 1 0 3 0x100083 ttyin getty 2701 33599 1 0 3 0x80 select sshd 68255 253986 45264 73 3 0x100090 kqread syslogd 45264 302093 1 0 3 0x100082 netio syslogd 59221 265501 1 77 3 0x100090 poll dhclient 73890 340299 1 0 3 0x80 poll dhclient 91272 147876 0 0 3 0x14200 bored smr 27721 521282 0 0 2 0x14200 zerothread 3388 392524 0 0 3 0x14200 aiodoned aiodoned 68954 230723 0 0 3 0x14200 syncer update 49561 144051 0 0 3 0x14200 cleaner cleaner 81521 37340 0 0 3 0x14200 reaper reaper 58390 312188 0 0 3 0x14200 pgdaemon pagedaemon 55331 19788 0 0 3 0x14200 bored crynlk 4608 195379 0 0 3 0x14200 bored crypto 66404 368430 0 0 3 0x40014200 acpi0 acpi0 83631 258824 0 0 3 0x14200 bored softnet 68436 234954 0 0 3 0x14200 bored systqmp 80792 303554 0 0 3 0x14200 bored systq 64471 507986 0 0 3 0x40014200 bored softclock 67362 11003 0 0 3 0x40014200 idle0 1 143908 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 9493 6340K 6599K 78643K 10882 0 pcb 13 8K 8K 78643K 87 0 rtable 118 5K 7K 78643K 492 0 ifaddr 70 14K 14K 78643K 175 0 sysctl 2 0K 0K 78643K 2 0 counters 21 16K 16K 78643K 25 0 ioctlops 0 0K 4K 78643K 77 0 iov 0 0K 16K 78643K 34 0 mount 1 1K 1K 78643K 1 0 vnodes 1223 77K 77K 78643K 1371 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 5 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 1K 78643K 76 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 195K 288K 78643K 12938 0 file desc 5 13K 25K 78643K 390 0 sigio 0 0K 0K 78643K 4 0 proc 49 38K 55K 78643K 465 0 subproc 32 2K 2K 78643K 68 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 68 0 in_multi 51 3K 3K 78643K 139 0 ether_multi 1 0K 0K 78643K 15 0 mrt 0 0K 0K 78643K 4 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 55 254K 254K 78643K 55 0 exec 0 0K 1K 78643K 220 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 125 39K 39K 78643K 1799 0 UVM aobj 11 2K 2K 78643K 13 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 62 0 NDP 11 0K 0K 78643K 30 0 temp 110 3863K 3929K 78643K 6572 0 kqueue 3 4K 8K 78643K 13 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 10 0 4 1 0 1 1 0 8 0 rtpcb 88 37 0 35 1 0 1 1 0 8 0 rtentry 112 84 0 39 2 0 2 2 0 8 0 unpcb 120 1025 0 1017 1 0 1 1 0 8 0 syncache 272 4 0 4 1 1 0 1 0 8 0 tcpqe 32 121 0 121 1 1 0 1 0 8 0 tcpcb 592 154 0 146 3 1 2 2 0 8 0 ipq 40 2 0 2 1 1 0 1 0 8 0 ipqe 40 8 0 8 1 1 0 1 0 8 0 inpcb 296 767 0 760 4 2 2 2 0 8 1 rttmr 72 2 0 2 1 0 1 1 0 8 1 nd6 48 23 0 17 1 0 1 1 0 8 0 pkpcb 40 8 0 8 1 0 1 1 0 8 1 ppxss 1136 1 0 1 1 1 0 1 0 8 0 pfrktable 1344 69 0 67 4 3 1 1 0 8 0 pftag 88 25 0 24 2 1 1 1 0 8 0 pfrule 1360 24 0 18 2 1 1 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 331 0 136 15 2 13 15 0 8 0 art_table 32 333 0 136 2 0 2 2 0 8 0 art_node 16 81 0 40 1 0 1 1 0 8 0 sysvmsgpl 40 44 0 35 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 72 0 62 1 0 1 1 0 8 0 shmpl 112 10 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1862 0 467 88 0 88 88 0 8 0 ffsino 240 1862 0 467 83 0 83 83 0 8 0 nchpl 144 2551 0 975 60 0 60 60 0 8 0 uvmvnodes 72 2010 0 0 37 0 37 37 0 8 0 vnodes 208 2010 0 0 106 0 106 106 0 8 0 namei 1024 6917 0 6917 3 2 1 1 0 8 1 vcpupl 1984 1 0 0 1 0 1 1 0 8 0 vmpool 528 1 0 0 1 0 1 1 0 8 0 pfiaddrpl 120 20 0 18 4 3 1 1 0 8 0 scxspl 200 7383 0 7383 2 1 1 1 0 8 1 plimitpl 152 46 0 39 1 0 1 1 0 8 0 sigapl 424 571 0 542 4 0 4 4 0 8 0 futexpl 56 8082 0 8082 3 2 1 1 0 8 1 knotepl 112 97 0 77 1 0 1 1 0 8 0 kqueuepl 152 50 0 48 1 0 1 1 0 8 0 pipepl 272 131 0 119 2 0 2 2 0 8 1 fdescpl 432 556 0 542 2 0 2 2 0 8 0 filepl 120 4135 0 4036 6 0 6 6 0 8 3 lockfpl 104 37 0 36 1 0 1 1 0 8 0 lockfspl 48 17 0 16 1 0 1 1 0 8 0 sessionpl 120 19 0 9 1 0 1 1 0 8 0 pgrppl 48 19 0 9 1 0 1 1 0 8 0 ucredpl 96 364 0 356 1 0 1 1 0 8 0 zombiepl 144 542 0 542 1 0 1 1 0 8 1 processpl 944 571 0 542 4 0 4 4 0 8 0 procpl 632 992 0 956 4 0 4 4 0 8 0 sosppl 144 5 0 5 2 1 1 1 0 8 1 sockpl 400 1846 0 1829 7 3 4 4 0 8 2 mcl64k 65536 14 0 14 4 3 1 1 0 8 1 mcl16k 16384 3 0 3 3 2 1 1 0 8 1 mcl12k 12288 11 0 11 2 1 1 1 0 8 1 mcl9k 9216 8 0 8 2 1 1 1 0 8 1 mcl8k 8192 16 0 16 3 2 1 1 0 8 1 mcl4k 4096 36 0 36 4 3 1 1 0 8 1 mcl2k2 2112 2 0 2 1 0 1 1 0 8 1 mcl2k 2048 90373 0 90312 18 10 8 16 0 8 0 mtagpl 96 24 0 19 2 1 1 1 0 8 0 mbufpl 256 145905 0 145784 18 6 12 14 0 8 0 bufpl 280 3915 0 122 271 0 271 271 0 8 0 anonpl 16 72225 0 56021 76 2 74 75 0 107 0 amapchunkpl 152 2676 0 2485 10 1 9 10 0 158 0 amappl16 192 2466 0 1505 51 1 50 50 0 8 1 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 12 0 9 1 0 1 1 0 8 0 amappl13 168 113 0 106 1 0 1 1 0 8 0 amappl12 160 96 0 91 1 0 1 1 0 8 0 amappl11 152 142 0 133 1 0 1 1 0 8 0 amappl10 144 70 0 66 1 0 1 1 0 8 0 amappl9 136 478 0 477 1 0 1 1 0 8 0 amappl8 128 456 0 429 1 0 1 1 0 8 0 amappl7 120 163 0 151 1 0 1 1 0 8 0 amappl6 112 116 0 109 1 0 1 1 0 8 0 amappl5 104 412 0 401 1 0 1 1 0 8 0 amappl4 96 532 0 499 1 0 1 1 0 8 0 amappl3 88 202 0 192 1 0 1 1 0 8 0 amappl2 80 3495 0 3431 2 0 2 2 0 8 0 amappl1 72 21695 0 21279 24 15 9 17 0 8 0 amappl 80 1280 0 1224 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 12 0 2 1 0 1 1 0 8 0 uaddrrnd 24 557 0 542 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 557 0 542 1 0 1 1 0 8 0 vmmpekpl 168 7435 0 7409 2 0 2 2 0 8 0 vmmpepl 168 76132 0 74065 156 37 119 149 0 357 28 vmsppl 272 556 0 542 3 1 2 2 0 8 1 pdppl 4096 1120 0 1085 6 1 5 6 0 8 0 pvpl 32 218074 0 198870 175 2 173 175 0 265 0 pmappl 200 556 0 542 1 0 1 1 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 267 0 39 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(ffffffff82422f01) at panic+0x164 sys/kern/subr_prf.c:218 m_copym(fffffd805e206700,2a4,3b4,2) at m_copym+0x589 sys/kern/uipc_mbuf.c:664 tcp_output(ffff800000ac5280) at tcp_output+0x154d sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd805da73328,9,fffffd805e206600,0,0,ffff80001d702c68) at tcp_usrreq+0xa54 sosend(fffffd805da73328,0,ffff80001d71f138,0,0,80) at sosend+0x669 sys/kern/uipc_socket.c:555 dofilewritev(ffff80001d702c68,4,ffff80001d71f138,0,ffff80001d71f220) at dofilewritev+0x1ab sys/kern/sys_generic.c:365 sys_write(ffff80001d702c68,ffff80001d71f1d0,ffff80001d71f220) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff80001d71f2a0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe35b0, 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(ffffffff82422f01) at panic+0x164 sys/kern/subr_prf.c:218 m_copym(fffffd805e206700,2a4,3b4,2) at m_copym+0x589 sys/kern/uipc_mbuf.c:664 tcp_output(ffff800000ac5280) at tcp_output+0x154d sys/netinet/tcp_output.c:673 tcp_usrreq(fffffd805da73328,9,fffffd805e206600,0,0,ffff80001d702c68) at tcp_usrreq+0xa54 sosend(fffffd805da73328,0,ffff80001d71f138,0,0,80) at sosend+0x669 sys/kern/uipc_socket.c:555 dofilewritev(ffff80001d702c68,4,ffff80001d71f138,0,ffff80001d71f220) at dofilewritev+0x1ab sys/kern/sys_generic.c:365 sys_write(ffff80001d702c68,ffff80001d71f1d0,ffff80001d71f220) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff80001d71f2a0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe35b0, count: -10