panic: tcp_output Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 91997 23317 32767 0x10 0 1 syz-executor.6 *460138 23317 32767 0x10 0x4000000 0 syz-executor.6 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(ffff800000bbaf00) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd8078f0c3d8,fffffd806acb2f00,0,fffffd8069606c00) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd8078f0c3d8,0,ffff80002c46ff20,0,fffffd8069606c00,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd8078f0c3d8,0,ffff80002c46ff20,0,fffffd8069606c00,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff8000fffef500,3,ffff80002c4700a0,0,ffff80002c470190) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff8000fffef500,ffff80002c470148,ffff80002c470190) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002c470210) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002c470210) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf00ca5c7cf0, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: tcp_output ddb{0}> 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(ffff800000bbaf00) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd8078f0c3d8,fffffd806acb2f00,0,fffffd8069606c00) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd8078f0c3d8,0,ffff80002c46ff20,0,fffffd8069606c00,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd8078f0c3d8,0,ffff80002c46ff20,0,fffffd8069606c00,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff8000fffef500,3,ffff80002c4700a0,0,ffff80002c470190) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff8000fffef500,ffff80002c470148,ffff80002c470190) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002c470210) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002c470210) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf00ca5c7cf0, count: -9 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002c46fb80 rbx 0xffffffff82934b8f cpu_info_full_primary+0x2b8f rdx 0xffff800000beb180 rcx 0 rax 0xffff8000fffef500 r8 0x101010101010101 r9 0x8080808080808080 r10 0x8acc9ce18b1e58fd r11 0xe0fc7709bd8dc9da r12 0xffffffff82934990 cpu_info_full_primary+0x2990 r13 0 r14 0 r15 0x1 rip 0xffffffff823fc058 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002c46fb70 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.6) pid=460138 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=59, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffee2a0,0xffffffff82a76648 process=0xffff800027e090b8 user=0xffff80002c46b000, vmspace=0xfffffd8069680018 estcpu=9, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 16791 216386 50413 32767 3 0x90 nanoslp syz-executor.1 16791 230583 50413 32767 3 0x4000090 ttyout syz-executor.1 16791 287889 50413 32767 3 0x4000090 fsleep syz-executor.1 27049 105036 80799 32767 2 0x10 syz-executor.5 20898 332591 76432 32767 3 0x90 nanoslp syz-executor.3 20898 389073 76432 32767 3 0x4000090 fsleep syz-executor.3 23317 91997 10637 32767 7 0x10 syz-executor.6 *23317 460138 10637 32767 7 0x4000010 syz-executor.6 52982 413367 85058 32767 2 0x10 syz-executor.2 11275 442977 12330 32767 3 0x90 nanoslp syz-executor.7 80799 388168 94434 32767 3 0x90 nanoslp syz-executor.5 12330 225246 34073 0 3 0x82 wait syz-executor.7 10637 175899 6205 32767 3 0x90 nanoslp syz-executor.6 42418 409721 60784 32767 2 0x10 syz-executor.4 94434 506 34073 0 3 0x82 wait syz-executor.5 6205 120921 34073 0 3 0x82 wait syz-executor.6 60784 407890 34073 0 3 0x82 wait syz-executor.4 76432 117783 56723 32767 3 0x90 nanoslp syz-executor.3 50413 227286 76662 32767 3 0x90 nanoslp syz-executor.1 85058 196618 34073 0 3 0x82 wait syz-executor.2 56723 416004 34073 0 3 0x82 wait syz-executor.3 13869 131404 5341 32767 3 0x90 nanoslp syz-executor.0 76662 1727 34073 0 3 0x82 wait syz-executor.1 5341 190973 34073 0 3 0x82 wait syz-executor.0 34073 390892 22884 0 3 0x82 wait syz-fuzzer 34073 139484 22884 0 3 0x4000082 thrsleep syz-fuzzer 34073 334931 22884 0 3 0x4000082 thrsleep syz-fuzzer 34073 204419 22884 0 3 0x4000082 thrsleep syz-fuzzer 34073 306407 22884 0 3 0x4000082 wait syz-fuzzer 34073 325249 22884 0 3 0x4000082 wait syz-fuzzer 34073 13373 22884 0 3 0x4000082 wait syz-fuzzer 34073 308128 22884 0 3 0x4000082 thrsleep syz-fuzzer 34073 129732 22884 0 3 0x4000082 wait syz-fuzzer 34073 280426 22884 0 3 0x4000082 wait syz-fuzzer 34073 224888 22884 0 3 0x4000082 wait syz-fuzzer 34073 137810 22884 0 3 0x4000082 wait syz-fuzzer 34073 168167 22884 0 3 0x4000082 thrsleep syz-fuzzer 34073 375749 22884 0 3 0x4000082 kqread syz-fuzzer 34073 339582 22884 0 3 0x4000082 thrsleep syz-fuzzer 34073 104337 22884 0 3 0x4000082 thrsleep syz-fuzzer 34073 274473 22884 0 3 0x4000082 thrsleep syz-fuzzer 22884 283767 54991 0 3 0x10008a sigsusp ksh 54991 180330 71301 0 3 0x9a kqread sshd 25859 113008 1 0 3 0x100083 ttyin getty 71301 395447 1 0 3 0x88 kqread sshd 99450 398350 26068 73 3 0x1100090 kqread syslogd 26068 143070 1 0 3 0x100082 netio syslogd 59199 508851 1 0 3 0x100080 kqread resolvd 88520 403246 74444 77 3 0x100092 kqread dhcpleased 52615 266468 74444 77 3 0x100092 kqread dhcpleased 74444 485630 1 0 3 0x80 kqread dhcpleased 1246 242479 0 0 3 0x14200 bored smr 26928 491806 0 0 2 0x14200 zerothread 96045 167643 0 0 3 0x14200 aiodoned aiodoned 66142 168164 0 0 3 0x14200 syncer update 51246 352194 0 0 3 0x14200 cleaner cleaner 90055 85897 0 0 3 0x14200 reaper reaper 24034 343756 0 0 3 0x14200 pgdaemon pagedaemon 25077 471031 0 0 3 0x14200 bored viomb 36100 9295 0 0 3 0x40014200 acpi0 acpi0 84593 109410 0 0 3 0x40014200 idle1 57437 41974 0 0 3 0x14200 bored softnet 92788 317564 0 0 3 0x14200 bored softnet 65931 192417 0 0 3 0x14200 bored softnet 85751 316602 0 0 3 0x14200 bored softnet 88984 226390 0 0 3 0x14200 bored systqmp 30141 345830 0 0 3 0x14200 bored systq 98328 106302 0 0 3 0x40014200 bored softclock 40215 360733 0 0 3 0x40014200 idle0 1 434278 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 23317 (syz-executor.6) thread 0xffff8000fffef500 (460138) 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{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10175 6407K 6419K 78643K 11265 0 pcb 13 10K 12K 78643K 15 0 rtable 234 6K 6K 78643K 343 0 ifaddr 82 16K 16K 78643K 84 0 counters 56 35K 35K 78643K 56 0 ioctlops 0 0K 2K 78643K 36 0 iov 0 0K 0K 78643K 73 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1270 79K 79K 78643K 1314 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 12 0K 0K 78643K 142 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 22 81K 121K 78643K 301 0 sigio 0 0K 0K 78643K 36 0 proc 56 78K 115K 78643K 473 0 subproc 104 6K 6K 78643K 104 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 99 6K 6K 78643K 99 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 37 175K 175K 78643K 37 0 exec 0 0K 2K 78643K 682 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 255 82K 83K 78643K 3227 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 4 0K 0K 78643K 48 0 NDP 11 0K 2K 78643K 27 0 temp 123 4722K 4786K 78643K 3821 0 kqueue 12 18K 22K 78643K 37 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> 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 47 0 44 1 0 1 1 0 8 0 rtentry 112 111 0 1 4 0 4 4 0 8 0 unpcb 144 172 0 159 2 1 1 2 0 8 0 syncache 296 4 0 4 1 1 0 1 0 8 0 tcpqe 32 9 0 9 1 1 0 1 0 8 0 tcpcb 768 24 0 19 2 1 1 2 0 8 0 arp 120 18 0 0 1 0 1 1 0 8 0 ipq 40 2 0 2 1 1 0 1 0 8 0 ipqe 40 6 0 6 1 1 0 1 0 8 0 inpcb 368 379 0 368 13 9 4 13 0 8 2 nd6 48 24 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 453 0 0 29 0 29 29 0 8 0 art_table 32 454 0 0 4 0 4 4 0 8 0 art_node 16 110 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 36 0 18 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 140 0 130 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1702 0 273 90 0 90 90 0 8 0 ffsino 272 1702 0 273 96 0 96 96 0 8 0 nchpl 144 2211 0 539 63 0 63 63 0 8 0 uvmvnodes 80 1815 0 0 38 0 38 38 0 8 0 vnodes 216 1815 0 0 101 0 101 101 0 8 0 namei 1024 7128 0 7128 2 1 1 2 0 8 1 percpumem 16 40 0 0 1 0 1 1 0 8 0 kstatmem 264 22 0 0 2 0 2 2 0 8 0 scxspl 216 6603 0 6603 9 1 8 8 0 8 8 plimitpl 152 33 0 11 1 0 1 1 0 8 0 sigapl 424 577 0 525 7 0 7 7 0 8 0 futexpl 64 1705 0 1703 1 0 1 1 0 8 0 knotepl 120 300 0 0 10 0 10 10 0 8 0 kqueuepl 216 109 0 101 5 4 1 5 0 8 0 pipepl 320 297 0 269 8 5 3 8 0 8 0 fdescpl 496 560 0 527 7 2 5 6 0 8 0 filepl 152 2974 0 2733 16 5 11 16 0 8 1 lockfpl 104 24 0 22 1 0 1 1 0 8 0 lockfspl 48 10 0 8 1 0 1 1 0 8 0 sessionpl 144 23 0 7 1 0 1 1 0 8 0 pgrppl 48 43 0 27 1 0 1 1 0 8 0 ucredpl 104 214 0 196 1 0 1 1 0 8 0 zombiepl 144 527 0 525 1 0 1 1 0 8 0 processpl 1064 577 0 525 5 1 4 5 0 8 0 procpl 672 931 0 859 8 1 7 8 0 8 0 sockpl 488 598 0 571 23 15 8 23 0 8 4 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 7 0 0 1 0 1 1 0 8 0 mcl4k 4096 7 0 0 1 0 1 1 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 247 0 0 30 0 30 30 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 327 0 0 20 0 20 20 0 8 0 bufpl 288 3734 0 129 258 0 258 258 0 8 0 anonpl 24 86811 0 75445 75 3 72 72 0 186 1 amapchunkpl 152 7766 0 7134 28 1 27 27 0 158 0 amappl16 200 862 0 544 19 1 18 18 0 8 0 amappl15 192 143 0 133 1 0 1 1 0 8 0 amappl14 184 18 0 15 1 0 1 1 0 8 0 amappl13 176 97 0 93 1 0 1 1 0 8 0 amappl12 168 5 0 3 1 0 1 1 0 8 0 amappl11 160 105 0 88 1 0 1 1 0 8 0 amappl10 152 38 0 32 1 0 1 1 0 8 0 amappl9 144 515 0 509 1 0 1 1 0 8 0 amappl8 136 615 0 559 3 0 3 3 0 8 0 amappl7 128 174 0 150 1 0 1 1 0 8 0 amappl6 120 208 0 192 2 1 1 2 0 8 0 amappl5 112 280 0 259 1 0 1 1 0 8 0 amappl4 104 824 0 795 2 0 2 2 0 8 0 amappl3 96 1084 0 1032 2 0 2 2 0 8 0 amappl2 88 448 0 411 2 1 1 2 0 8 0 amappl1 80 15264 0 14586 20 3 17 20 0 8 0 amappl 88 2769 0 2605 6 1 5 5 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 24 561 0 528 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 561 0 528 1 0 1 1 0 8 0 vmmpekpl 168 9615 0 9569 3 0 3 3 0 8 0 vmmpepl 168 56243 0 53788 125 1 124 125 0 357 9 vmsppl 368 560 0 528 4 0 4 4 0 8 0 rwobjpl 56 16424 0 13336 45 0 45 45 0 8 0 pdppl 4096 1129 0 1056 112 33 79 95 0 8 6 pvpl 32 285545 0 269428 257 15 242 256 0 265 103 pmappl 248 560 0 528 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 665 0 45 19 0 19 19 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> 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(ffff800000bbaf00) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd8078f0c3d8,fffffd806acb2f00,0,fffffd8069606c00) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd8078f0c3d8,0,ffff80002c46ff20,0,fffffd8069606c00,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd8078f0c3d8,0,ffff80002c46ff20,0,fffffd8069606c00,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff8000fffef500,3,ffff80002c4700a0,0,ffff80002c470190) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff8000fffef500,ffff80002c470148,ffff80002c470190) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002c470210) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002c470210) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf00ca5c7cf0, count: -9 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020dd8ff0) 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: 0x7f7fffff4280, count: 12 ddb{1}> trace x86_ipi_db(ffff800020dd8ff0) 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: 0x7f7fffff4280, count: -3