panic: acquiring blockable sleep lock with spinlock or critical section held (kernel_lock) &kernel_lock Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *125821 84483 32767 0x10 0x4000000 0 syz-executor.3 219886 37356 0 0x14000 0x200 1 reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8259e057) at panic+0x177 sys/kern/subr_prf.c:202 witness_checkorder(ffffffff82a712b0,9,0) at witness_checkorder+0x116d sys/kern/subr_witness.c:833 __mp_lock(ffffffff82a710a8) at __mp_lock+0xa1 read_rflags machine/cpufunc.h:195 [inline] __mp_lock(ffffffff82a710a8) at __mp_lock+0xa1 intr_disable machine/cpufunc.h:216 [inline] __mp_lock(ffffffff82a710a8) at __mp_lock+0xa1 sys/kern/kern_lock.c:142 selwakeup(fffffd8069f2b528) at selwakeup+0x16 klist_empty sys/sys/event.h:361 [inline] selwakeup(fffffd8069f2b528) at selwakeup+0x16 sys/kern/sys_generic.c:885 sorwakeup(fffffd8069f2b410) at sorwakeup+0xc9 sys/kern/uipc_socket.c:1699 udp_sbappend(fffffd806a3863c8,fffffd807574f500,fffffd807e5b23b0,0,14,fffffd807e5b23c4,a17a628698073e20,0) at udp_sbappend+0x3b1 sys/netinet/udp_usrreq.c:638 udp_input(ffff8000284d3208,ffff8000284d3214,11,2) at udp_input+0xbcb sys/netinet/udp_usrreq.c:427 ip_deliver(ffff8000284d3208,ffff8000284d3214,11,2) at ip_deliver+0x322 sys/netinet/ip_input.c:657 ip_ours(ffff8000284d3208,ffff8000284d3214,ffff8000246a0000,0) at ip_ours+0x3ba sys/netinet/ip_input.c:616 ip_input_if(ffff8000284d3208,ffff8000284d3214,4,0,ffff800000689000) at ip_input_if+0x2a1 ipv4_input(ffff800000689000,fffffd807e5b2300) at ipv4_input+0x48 sys/netinet/ip_input.c:242 if_input_local(ffff800000689000,fffffd807e5b2300,2) at if_input_local+0x10e sys/net/if.c:774 ip_output(fffffd8074ea0d00,0,fffffd806a386308,0,0,fffffd806a386290,f18091e3f5519ac0) at ip_output+0xb05 ip_mloopback sys/netinet/ip_output.c:1791 [inline] ip_output(fffffd8074ea0d00,0,fffffd806a386308,0,0,fffffd806a386290,f18091e3f5519ac0) at ip_output+0xb05 sys/netinet/ip_output.c:332 end trace frame: 0xffff8000284d3480, count: 0 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: acquiring blockable sleep lock with spinlock or critical section held (kernel_lock) &kernel_lock ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440 panic(ffffffff8259e057) at panic+0x177 sys/kern/subr_prf.c:202 witness_checkorder(ffffffff82a712b0,9,0) at witness_checkorder+0x116d sys/kern/subr_witness.c:833 __mp_lock(ffffffff82a710a8) at __mp_lock+0xa1 read_rflags machine/cpufunc.h:195 [inline] __mp_lock(ffffffff82a710a8) at __mp_lock+0xa1 intr_disable machine/cpufunc.h:216 [inline] __mp_lock(ffffffff82a710a8) at __mp_lock+0xa1 sys/kern/kern_lock.c:142 selwakeup(fffffd8069f2b528) at selwakeup+0x16 klist_empty sys/sys/event.h:361 [inline] selwakeup(fffffd8069f2b528) at selwakeup+0x16 sys/kern/sys_generic.c:885 sorwakeup(fffffd8069f2b410) at sorwakeup+0xc9 sys/kern/uipc_socket.c:1699 udp_sbappend(fffffd806a3863c8,fffffd807574f500,fffffd807e5b23b0,0,14,fffffd807e5b23c4,a17a628698073e20,0) at udp_sbappend+0x3b1 sys/netinet/udp_usrreq.c:638 udp_input(ffff8000284d3208,ffff8000284d3214,11,2) at udp_input+0xbcb sys/netinet/udp_usrreq.c:427 ip_deliver(ffff8000284d3208,ffff8000284d3214,11,2) at ip_deliver+0x322 sys/netinet/ip_input.c:657 ip_ours(ffff8000284d3208,ffff8000284d3214,ffff8000246a0000,0) at ip_ours+0x3ba sys/netinet/ip_input.c:616 ip_input_if(ffff8000284d3208,ffff8000284d3214,4,0,ffff800000689000) at ip_input_if+0x2a1 ipv4_input(ffff800000689000,fffffd807e5b2300) at ipv4_input+0x48 sys/netinet/ip_input.c:242 if_input_local(ffff800000689000,fffffd807e5b2300,2) at if_input_local+0x10e sys/net/if.c:774 ip_output(fffffd8074ea0d00,0,fffffd806a386308,0,0,fffffd806a386290,f18091e3f5519ac0) at ip_output+0xb05 ip_mloopback sys/netinet/ip_output.c:1791 [inline] ip_output(fffffd8074ea0d00,0,fffffd806a386308,0,0,fffffd806a386290,f18091e3f5519ac0) at ip_output+0xb05 sys/netinet/ip_output.c:332 udp_output(fffffd806a386290,fffffd8074ea0d00,0,0) at udp_output+0x58d sys/netinet/udp_usrreq.c:1011 sosend(fffffd8069f2b7d0,0,ffff8000284d3618,0,0,0) at sosend+0x632 sys/kern/uipc_socket.c:582 dofilewritev(ffff800021142fc8,4,ffff8000284d3618,0,ffff8000284d3710) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_write(ffff800021142fc8,ffff8000284d36b8,ffff8000284d3710) at sys_write+0x83 sys/kern/sys_generic.c:301 syscall(ffff8000284d3780) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000284d3780) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x789661a2570, count: -20 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff8000284d2c40 rbx 0xffffffff8290cbff cpu_info_full_primary+0x2bff rdx 0xffff800000bc6740 rcx 0 rax 0xffff800021142fc8 r8 0x101010101010101 r9 0x8080808080808080 r10 0xe8b11629ff6a6def r11 0x4eb153d4c793b4c1 r12 0xffffffff8290ca00 cpu_info_full_primary+0x2a00 r13 0 r14 0 r15 0x1 rip 0xffffffff81faa128 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000284d2c30 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.3) pid=125821 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff8000211427e8,0xffff80002116f7b0 process=0xffff800021224c90 user=0xffff8000284ce000, vmspace=0xfffffd806c6e6e70 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 96170 103658 8121 32767 2 0x10 syz-executor.5 67349 469438 50913 32767 2 0x10 syz-executor.0 67349 415714 50913 32767 2 0x4000010 syz-executor.0 93393 49649 18395 32767 2 0x10 syz-executor.2 93393 444882 18395 32767 3 0x4000090 fsleep syz-executor.2 84483 411930 53634 32767 2 0x10 syz-executor.3 *84483 125821 53634 32767 7 0x4000010 syz-executor.3 57937 133814 8667 32767 2 0x10 syz-executor.6 57937 204545 8667 32767 3 0x4000090 fsleep syz-executor.6 20815 402960 11291 32767 2 0x10 syz-executor.1 20815 402585 11291 32767 3 0x4000090 fsleep syz-executor.1 18836 207011 21472 32767 2 0x10 syz-executor.7 21472 440350 19600 0 3 0x82 wait syz-executor.7 8121 112055 95827 32767 2 0x10 syz-executor.5 95827 194788 19600 0 3 0x82 wait syz-executor.5 18395 322651 71732 32767 3 0x90 nanoslp syz-executor.2 71732 500270 19600 0 3 0x82 wait syz-executor.2 46320 21562 0 0 3 0x14200 bored sosplice 8667 308334 11182 32767 3 0x90 nanoslp syz-executor.6 91736 200904 43875 32767 3 0x90 nanoslp syz-executor.4 11182 161940 19600 0 3 0x82 wait syz-executor.6 43875 65166 19600 0 3 0x82 wait syz-executor.4 53634 479396 33766 32767 2 0x10 syz-executor.3 33766 427555 19600 0 3 0x82 wait syz-executor.3 11291 417406 57927 32767 3 0x90 nanoslp syz-executor.1 50913 426229 43261 32767 3 0x90 nanoslp syz-executor.0 57927 93042 19600 0 3 0x82 wait syz-executor.1 43261 170600 19600 0 3 0x82 wait syz-executor.0 19600 326347 57851 0 3 0x82 thrsleep syz-fuzzer 19600 115987 57851 0 3 0x4000082 nanoslp syz-fuzzer 19600 8157 57851 0 3 0x4000082 thrsleep syz-fuzzer 19600 520663 57851 0 3 0x4000082 nanoslp syz-fuzzer 19600 329824 57851 0 3 0x4000082 kqread syz-fuzzer 19600 228736 57851 0 3 0x4000082 thrsleep syz-fuzzer 19600 523893 57851 0 3 0x4000082 thrsleep syz-fuzzer 19600 344073 57851 0 3 0x4000082 thrsleep syz-fuzzer 19600 239822 57851 0 3 0x4000082 thrsleep syz-fuzzer 57851 293286 37484 0 3 0x10008a sigsusp ksh 37484 358524 76959 0 3 0x9a kqread sshd 41369 467436 1 0 3 0x100083 ttyin getty 76959 215764 1 0 3 0x88 kqread sshd 6153 443360 61585 73 3 0x1100090 kqread syslogd 61585 192023 1 0 3 0x100082 netio syslogd 44681 262890 1 0 3 0x100080 kqread resolvd 96543 176139 56495 77 3 0x100092 kqread dhcpleased 56572 27758 56495 77 3 0x100092 kqread dhcpleased 56495 368597 1 0 3 0x80 kqread dhcpleased 71888 57236 0 0 3 0x14200 bored smr 70195 351162 0 0 2 0x14200 zerothread 54948 280011 0 0 3 0x14200 aiodoned aiodoned 43022 476758 0 0 3 0x14200 syncer update 68319 253367 0 0 3 0x14200 cleaner cleaner 37356 219886 0 0 7 0x14200 reaper 35471 491412 0 0 3 0x14200 pgdaemon pagedaemon 22824 392083 0 0 3 0x14200 bored viomb 81079 213311 0 0 3 0x40014200 acpi0 acpi0 40051 255062 0 0 3 0x40014200 idle1 97833 407571 0 0 3 0x14200 bored softnet 94466 257397 0 0 3 0x14200 bored systqmp 86219 211698 0 0 3 0x14200 bored systq 45136 157016 0 0 3 0x40014200 bored softclock 4770 19286 0 0 3 0x40014200 idle0 1 408991 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 0: exclusive mutex &table->inpt_mtx r = 0 (0xffffffff82a7d788) #0 witness_lock+0x44d #1 mtx_enter_try+0x100 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 udp_input+0x7b0 #4 ip_deliver+0x322 sys/netinet/ip_input.c:657 #5 ip_ours+0x3ba sys/netinet/ip_input.c:616 #6 ip_input_if+0x2a1 #7 ipv4_input+0x48 sys/netinet/ip_input.c:242 #8 if_input_local+0x10e sys/net/if.c:774 #9 ip_output+0xb05 ip_mloopback sys/netinet/ip_output.c:1791 [inline] #9 ip_output+0xb05 sys/netinet/ip_output.c:332 #10 udp_output+0x58d sys/netinet/udp_usrreq.c:1011 #11 sosend+0x632 sys/kern/uipc_socket.c:582 #12 dofilewritev+0x19c sys/kern/sys_generic.c:381 #13 sys_write+0x83 sys/kern/sys_generic.c:301 #14 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #14 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #15 Xsyscall+0x128 CPU 1: kernel: protection fault trap, code=0 Faulted in DDB; continuing... ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10176 6407K 6419K 78643K 11284 0 pcb 13 8K 8K 78643K 13 0 rtable 240 6K 7K 78643K 656 0 ifaddr 81 17K 17K 78643K 125 0 sysctl 3 1K 1K 78643K 3 0 counters 56 35K 35K 78643K 68 0 ioctlops 0 0K 2K 78643K 62 0 iov 0 0K 16K 78643K 207 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1270 79K 79K 78643K 1459 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 14 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 251 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 24 89K 121K 78643K 4263 0 sigio 0 0K 0K 78643K 20 0 proc 56 74K 111K 78643K 873 0 subproc 104 6K 6K 78643K 182 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 428 0 in_multi 99 6K 7K 78643K 285 0 ether_multi 1 0K 0K 78643K 23 0 mrt 1 0K 0K 78643K 2 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 73 334K 334K 78643K 73 0 exec 0 0K 2K 78643K 1029 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 7 26K 26K 78643K 7 0 UVM amap 349 83K 109K 78643K 51579 0 UVM aobj 71 7K 7K 78643K 71 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 131 0 NDP 11 0K 2K 78643K 45 0 temp 125 4711K 4775K 78643K 13514 0 kqueue 12 18K 28K 78643K 452 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 120 221 0 218 1 0 1 1 0 8 0 rtentry 112 181 0 70 4 0 4 4 0 8 0 unpcb 136 999 0 986 1 0 1 1 0 8 0 syncache 296 110 0 110 5 4 1 1 0 8 1 tcpqe 32 74 0 74 7 6 1 1 0 8 1 tcpcb 736 930 0 907 12 7 5 5 0 8 1 arp 120 31 0 12 1 0 1 1 0 8 0 ipq 40 8 0 6 2 1 1 1 0 8 0 ipqe 40 52 0 49 2 1 1 1 0 8 0 inpcb 312 1910 0 1890 6 3 3 3 0 8 1 ip6q 72 4 0 2 2 1 1 1 0 8 0 ip6af 40 6 0 4 2 1 1 1 0 8 0 nd6 48 45 0 21 1 0 1 1 0 8 0 kcovpl 48 14 0 6 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 766 0 310 32 2 30 31 0 8 1 art_table 32 767 0 310 4 0 4 4 0 8 0 art_node 16 180 0 79 1 0 1 1 0 8 0 sysvmsgpl 40 21 0 0 1 0 1 1 0 8 0 semapl 112 249 0 239 1 0 1 1 0 8 0 shmpl 112 68 0 0 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 6312 0 4862 91 0 91 91 0 8 0 ffsino 272 6312 0 4862 98 0 98 98 0 8 0 nchpl 144 11496 0 9870 62 0 62 62 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 30830 0 30830 2 1 1 2 0 8 1 percpumem 16 46 0 6 1 0 1 1 0 8 0 scxspl 216 34945 0 34945 17 16 1 8 0 8 1 plimitpl 152 349 0 326 3 2 1 2 0 8 0 sigapl 424 4537 0 4486 7 1 6 7 0 8 0 futexpl 64 23817 0 23814 1 0 1 1 0 8 0 knotepl 120 479 0 0 11 0 11 11 0 8 0 kqueuepl 216 617 0 609 1 0 1 1 0 8 0 pipepl 336 303 0 275 3 0 3 3 0 8 0 fdescpl 496 4522 0 4487 7 2 5 6 0 8 0 filepl 152 13189 0 12950 11 1 10 11 0 8 0 lockfpl 104 531 0 529 1 0 1 1 0 8 0 lockfspl 48 154 0 152 1 0 1 1 0 8 0 sessionpl 144 29 0 13 1 0 1 1 0 8 0 pgrppl 48 34 0 18 1 0 1 1 0 8 0 ucredpl 96 2716 0 2698 1 0 1 1 0 8 0 zombiepl 144 4487 0 4486 1 0 1 1 0 8 0 processpl 1064 4537 0 4486 5 1 4 4 0 8 0 procpl 672 9092 0 9028 9 3 6 7 0 8 0 sosppl 168 91 0 90 6 5 1 1 0 8 0 sockpl 480 3140 0 3105 11 5 6 6 0 8 0 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 9 0 0 2 0 2 2 0 8 0 mcl12k 12288 9 0 0 1 0 1 1 0 8 0 mcl9k 9216 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 26 0 0 4 1 3 3 0 8 0 mcl2k2 2112 6 0 0 1 0 1 1 0 8 0 mcl2k 2048 230 0 0 18 0 18 18 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 823 0 0 45 0 45 45 0 8 0 bufpl 288 10023 0 3688 453 0 453 453 0 8 0 anonpl 24 1248999 0 1239126 193 110 83 140 0 186 9 amapchunkpl 152 125674 0 125000 62 32 30 54 0 158 2 amappl16 200 17423 0 17211 115 99 16 51 0 8 4 amappl15 192 824 0 820 1 0 1 1 0 8 0 amappl14 184 1253 0 1244 1 0 1 1 0 8 0 amappl13 176 116 0 115 1 0 1 1 0 8 0 amappl12 168 1048 0 1035 1 0 1 1 0 8 0 amappl11 160 62 0 52 1 0 1 1 0 8 0 amappl10 152 829 0 823 1 0 1 1 0 8 0 amappl9 144 475 0 471 1 0 1 1 0 8 0 amappl8 136 1848 0 1741 4 0 4 4 0 8 0 amappl7 128 1153 0 1136 1 0 1 1 0 8 0 amappl6 120 226 0 203 2 1 1 2 0 8 0 amappl5 112 3857 0 3834 1 0 1 1 0 8 0 amappl4 104 1743 0 1712 2 1 1 2 0 8 0 amappl3 96 1338 0 1321 1 0 1 1 0 8 0 amappl2 88 1254 0 1205 3 1 2 3 0 8 0 amappl1 80 77784 0 77148 18 3 15 18 0 8 0 amappl 88 50785 0 50544 7 0 7 7 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 70 0 0 2 0 2 2 0 8 0 uaddrrnd 24 4522 0 4487 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4522 0 4487 1 0 1 1 0 8 0 vmmpekpl 168 26522 0 26449 4 0 4 4 0 8 0 vmmpepl 168 404874 0 402389 191 69 122 149 0 357 6 vmsppl 368 4521 0 4487 4 0 4 4 0 8 0 rwobjpl 56 101133 0 93952 109 6 103 105 0 8 0 pdppl 4096 9051 0 8974 190 109 81 93 0 8 4 pvpl 32 2374908 0 2359692 315 153 162 250 0 265 19 pmappl 248 4521 0 4487 4 1 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 973 0 125 25 0 25 25 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:440 panic(ffffffff8259e057) at panic+0x177 sys/kern/subr_prf.c:202 witness_checkorder(ffffffff82a712b0,9,0) at witness_checkorder+0x116d sys/kern/subr_witness.c:833 __mp_lock(ffffffff82a710a8) at __mp_lock+0xa1 read_rflags machine/cpufunc.h:195 [inline] __mp_lock(ffffffff82a710a8) at __mp_lock+0xa1 intr_disable machine/cpufunc.h:216 [inline] __mp_lock(ffffffff82a710a8) at __mp_lock+0xa1 sys/kern/kern_lock.c:142 selwakeup(fffffd8069f2b528) at selwakeup+0x16 klist_empty sys/sys/event.h:361 [inline] selwakeup(fffffd8069f2b528) at selwakeup+0x16 sys/kern/sys_generic.c:885 sorwakeup(fffffd8069f2b410) at sorwakeup+0xc9 sys/kern/uipc_socket.c:1699 udp_sbappend(fffffd806a3863c8,fffffd807574f500,fffffd807e5b23b0,0,14,fffffd807e5b23c4,a17a628698073e20,0) at udp_sbappend+0x3b1 sys/netinet/udp_usrreq.c:638 udp_input(ffff8000284d3208,ffff8000284d3214,11,2) at udp_input+0xbcb sys/netinet/udp_usrreq.c:427 ip_deliver(ffff8000284d3208,ffff8000284d3214,11,2) at ip_deliver+0x322 sys/netinet/ip_input.c:657 ip_ours(ffff8000284d3208,ffff8000284d3214,ffff8000246a0000,0) at ip_ours+0x3ba sys/netinet/ip_input.c:616 ip_input_if(ffff8000284d3208,ffff8000284d3214,4,0,ffff800000689000) at ip_input_if+0x2a1 ipv4_input(ffff800000689000,fffffd807e5b2300) at ipv4_input+0x48 sys/netinet/ip_input.c:242 if_input_local(ffff800000689000,fffffd807e5b2300,2) at if_input_local+0x10e sys/net/if.c:774 ip_output(fffffd8074ea0d00,0,fffffd806a386308,0,0,fffffd806a386290,f18091e3f5519ac0) at ip_output+0xb05 ip_mloopback sys/netinet/ip_output.c:1791 [inline] ip_output(fffffd8074ea0d00,0,fffffd806a386308,0,0,fffffd806a386290,f18091e3f5519ac0) at ip_output+0xb05 sys/netinet/ip_output.c:332 udp_output(fffffd806a386290,fffffd8074ea0d00,0,0) at udp_output+0x58d sys/netinet/udp_usrreq.c:1011 sosend(fffffd8069f2b7d0,0,ffff8000284d3618,0,0,0) at sosend+0x632 sys/kern/uipc_socket.c:582 dofilewritev(ffff800021142fc8,4,ffff8000284d3618,0,ffff8000284d3710) at dofilewritev+0x19c sys/kern/sys_generic.c:381 sys_write(ffff800021142fc8,ffff8000284d36b8,ffff8000284d3710) at sys_write+0x83 sys/kern/sys_generic.c:301 syscall(ffff8000284d3780) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000284d3780) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x789661a2570, count: -20 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffff800020ce8ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf kd_curproc sys/dev/kcov.c:574 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf sys/dev/kcov.c:148 msleep_nsec(ffffffff82a92f68,ffffffff82939650,4,ffffffff826363d4,ffffffffffffffff) at msleep_nsec+0x48 sys/kern/kern_synch.c:280 reaper(ffff8000210f97a0) at reaper+0xcb sys/kern/kern_exit.c:428 end trace frame: 0x0, count: 9 ddb{1}> trace x86_ipi_db(ffff800020ce8ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf kd_curproc sys/dev/kcov.c:574 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xf sys/dev/kcov.c:148 msleep_nsec(ffffffff82a92f68,ffffffff82939650,4,ffffffff826363d4,ffffffffffffffff) at msleep_nsec+0x48 sys/kern/kern_synch.c:280 reaper(ffff8000210f97a0) at reaper+0xcb sys/kern/kern_exit.c:428 end trace frame: 0x0, count: -6