panic: tcp_output Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 234149 58709 0 0x2 0 0 syz-executor4051073628 * 54418 58709 0 0x2 0x4000000 1 syz-executor4051073628 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257befc) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000bce300) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd806e999b80,fffffd806d9c4300,0,fffffd806d9c4700) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd806e999b80,0,ffff8000212cc520,0,fffffd806d9c4700,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd806e999b80,0,ffff8000212cc520,0,fffffd806d9c4700,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff800021233a48,3,ffff8000212cc6a0,0,ffff8000212cc790) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff800021233a48,ffff8000212cc748,ffff8000212cc790) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff8000212cc810) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff8000212cc810) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd01488aabc0, count: 6 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 *cpu1: tcp_output ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257befc) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000bce300) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd806e999b80,fffffd806d9c4300,0,fffffd806d9c4700) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd806e999b80,0,ffff8000212cc520,0,fffffd806d9c4700,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd806e999b80,0,ffff8000212cc520,0,fffffd806d9c4700,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff800021233a48,3,ffff8000212cc6a0,0,ffff8000212cc790) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff800021233a48,ffff8000212cc748,ffff8000212cc790) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff8000212cc810) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff8000212cc810) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd01488aabc0, count: -9 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff8000212cc180 rbx 0xffff800020dd9b8f rdx 0x3fd rcx 0 rax 0x12 r8 0x101010101010101 r9 0x8080808080808080 r10 0x6f5fbe30c26cefe1 r11 0xbe2b25fe4a03894c r12 0xffff800020dd9990 r13 0 r14 0 r15 0x1 rip 0xffffffff823fc058 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000212cc170 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor4051073628) pid=54418 stat=onproc flags process=2 proc=4000000 pri=32, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800021233ce8,0xffffffff82a76648 process=0xffff8000ffff4860 user=0xffff8000212c7000, vmspace=0xfffffd807effc2e0 estcpu=0, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 58709 234149 23994 0 7 0x2 syz-executor4051073628 *58709 54418 23994 0 7 0x4000002 syz-executor4051073628 23994 13272 48540 0 3 0x10008a sigsusp ksh 48540 197053 97076 0 3 0x9a kqread sshd 20762 174618 1 0 3 0x100083 ttyin getty 97076 44634 1 0 3 0x88 kqread sshd 52632 39905 42980 73 3 0x1100090 kqread syslogd 42980 352522 1 0 3 0x100082 netio syslogd 35429 355571 1 0 3 0x100080 kqread resolvd 44178 460412 21447 77 3 0x100092 kqread dhcpleased 6020 302090 21447 77 3 0x100092 kqread dhcpleased 21447 63828 1 0 3 0x80 kqread dhcpleased 69347 27852 0 0 3 0x14200 bored smr 86374 170120 0 0 2 0x14200 zerothread 73803 137941 0 0 3 0x14200 aiodoned aiodoned 97760 99248 0 0 3 0x14200 syncer update 87633 92675 0 0 3 0x14200 cleaner cleaner 32536 95170 0 0 3 0x14200 reaper reaper 58232 264058 0 0 3 0x14200 pgdaemon pagedaemon 76088 316478 0 0 3 0x14200 bored viomb 50829 228408 0 0 3 0x40014200 acpi0 acpi0 15815 518625 0 0 3 0x40014200 idle1 63693 386217 0 0 3 0x14200 bored softnet 1741 57682 0 0 3 0x14200 bored softnet 66253 373498 0 0 3 0x14200 bored softnet 47483 103237 0 0 3 0x14200 bored softnet 99018 63806 0 0 3 0x14200 bored systqmp 8608 282085 0 0 3 0x14200 bored systq 241 163248 0 0 3 0x40014200 bored softclock 10902 389656 0 0 3 0x40014200 idle0 1 296863 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 58709 (syz-executor4051073628) thread 0xffff800021233a48 (54418) exclusive rwlock netlock r = 0 (0xffffffff8292fbb0) #0 witness_lock+0x44d #1 sosend+0x500 sys/kern/uipc_socket.c:632 #2 sendit+0x65d sys/kern/uipc_syscalls.c:694 #3 sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 #4 syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] #4 syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 #5 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10149 6388K 6419K 78643K 11239 0 pcb 13 8K 8K 78643K 13 0 rtable 58 1K 2K 78643K 111 0 ifaddr 25 7K 7K 78643K 25 0 counters 40 33K 33K 78643K 40 0 ioctlops 0 0K 2K 78643K 25 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1166 73K 73K 78643K 1179 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 1K 1K 78643K 2 0 sem 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 1 0K 0K 78643K 1 0 proc 55 78K 79K 78643K 226 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 11 0K 0K 78643K 11 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 25 122K 122K 78643K 25 0 exec 0 0K 2K 78643K 410 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 62K 78643K 8 0 UVM amap 57 3K 4K 78643K 1457 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 3 0K 0K 78643K 3 0 temp 18 4709K 4773K 78643K 2350 0 kqueue 11 16K 18K 78643K 24 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 plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 21 0 18 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 144 33 0 20 1 0 1 1 0 8 0 syncache 296 5 0 5 2 1 1 1 0 8 1 tcpcb 768 9 0 5 1 0 1 1 0 8 0 arp 120 2 0 0 1 0 1 1 0 8 0 inpcb 368 26 0 19 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 96 0 0 6 0 6 6 0 8 0 art_table 32 97 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1415 0 38 87 0 87 87 0 8 0 ffsino 272 1415 0 38 92 0 92 92 0 8 0 nchpl 144 1600 0 46 58 0 58 58 0 8 0 uvmvnodes 80 1424 0 0 30 0 30 30 0 8 0 vnodes 216 1424 0 0 80 0 80 80 0 8 0 namei 1024 4155 0 4155 1 0 1 1 0 8 1 percpumem 16 32 0 0 1 0 1 1 0 8 0 kstatmem 264 6 0 0 1 0 1 1 0 8 0 scxspl 216 3769 0 3769 2 1 1 2 0 8 1 plimitpl 152 15 0 9 1 0 1 1 0 8 0 sigapl 424 306 0 276 4 0 4 4 0 8 0 knotepl 120 44 0 0 2 0 2 2 0 8 0 kqueuepl 216 20 0 13 1 0 1 1 0 8 0 pipepl 320 83 0 80 1 0 1 1 0 8 0 fdescpl 496 289 0 276 3 1 2 3 0 8 0 filepl 152 1068 0 1014 3 0 3 3 0 8 0 lockfpl 104 6 0 4 1 0 1 1 0 8 0 lockfspl 48 4 0 2 1 0 1 1 0 8 0 sessionpl 144 17 0 9 1 0 1 1 0 8 0 pgrppl 48 17 0 9 1 0 1 1 0 8 0 ucredpl 104 64 0 54 1 0 1 1 0 8 0 zombiepl 144 276 0 276 1 0 1 1 0 8 1 processpl 1064 306 0 276 3 0 3 3 0 8 0 procpl 672 307 0 276 3 0 3 3 0 8 0 sockpl 488 80 0 57 3 0 3 3 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 71 0 0 9 0 9 9 0 8 1 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 117 0 0 8 0 8 8 0 8 0 bufpl 288 1918 0 75 132 0 132 132 0 8 0 anonpl 24 35700 0 33708 14 2 12 13 0 186 0 amapchunkpl 152 2608 0 2506 5 1 4 5 0 158 0 amappl16 200 27 0 26 2 1 1 1 0 8 0 amappl15 192 63 0 59 1 0 1 1 0 8 0 amappl13 176 32 0 31 2 1 1 1 0 8 0 amappl12 168 3 0 3 2 1 1 1 0 8 1 amappl11 160 60 0 47 1 0 1 1 0 8 0 amappl9 144 481 0 479 1 0 1 1 0 8 0 amappl8 136 351 0 349 2 1 1 1 0 8 0 amappl7 128 62 0 55 1 0 1 1 0 8 0 amappl6 120 84 0 78 1 0 1 1 0 8 0 amappl5 112 85 0 77 1 0 1 1 0 8 0 amappl4 104 589 0 570 1 0 1 1 0 8 0 amappl3 96 437 0 411 1 0 1 1 0 8 0 amappl2 88 302 0 274 1 0 1 1 0 8 0 amappl1 80 9055 0 8664 9 0 9 9 0 8 0 amappl 88 1192 0 1152 2 1 1 2 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 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 72 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 290 0 277 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 290 0 277 1 0 1 1 0 8 0 vmmpekpl 168 6007 0 5991 1 0 1 1 0 8 0 vmmpepl 168 25744 0 24918 38 0 38 38 0 357 0 vmsppl 368 289 0 277 2 0 2 2 0 8 0 rwobjpl 56 9269 0 7306 29 0 29 29 0 8 0 pdppl 4096 587 0 554 54 21 33 41 0 8 0 pvpl 32 119795 0 115935 34 1 33 33 0 265 1 pmappl 248 289 0 277 2 1 1 2 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 401 0 23 11 0 11 11 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff82933ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 end of kernel end trace frame: 0x7f7ffffcb780, count: 12 ddb{0}> trace x86_ipi_db(ffffffff82933ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 end of kernel end trace frame: 0x7f7ffffcb780, count: -3 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:437 panic(ffffffff8257befc) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000bce300) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd806e999b80,fffffd806d9c4300,0,fffffd806d9c4700) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd806e999b80,0,ffff8000212cc520,0,fffffd806d9c4700,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd806e999b80,0,ffff8000212cc520,0,fffffd806d9c4700,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff800021233a48,3,ffff8000212cc6a0,0,ffff8000212cc790) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff800021233a48,ffff8000212cc748,ffff8000212cc790) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff8000212cc810) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff8000212cc810) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd01488aabc0, count: 6 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257befc) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000bce300) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd806e999b80,fffffd806d9c4300,0,fffffd806d9c4700) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd806e999b80,0,ffff8000212cc520,0,fffffd806d9c4700,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd806e999b80,0,ffff8000212cc520,0,fffffd806d9c4700,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff800021233a48,3,ffff8000212cc6a0,0,ffff8000212cc790) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff800021233a48,ffff8000212cc748,ffff8000212cc790) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff8000212cc810) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff8000212cc810) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd01488aabc0, count: -9 ddb{1}>