witness: userret: returning with the following locks held: shared rwlock netlock r = 0 (0xffffffff8386dc30) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_read+0x36e sys/kern/kern_rwlock.c:397 #2 sysctl_file+0xb13 sys/kern/kern_sysctl.c:1767 #3 kern_sysctl+0x251 sys/kern/kern_sysctl.c:526 #4 sys_sysctl+0x3f2 sys/kern/kern_sysctl.c:-1 #5 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 #6 Xsyscall+0x128 panic: witness_warn Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 376464 58904 32767 0x10 0 0 syz-executor *202685 23293 32767 0x10 0x4000000 1 syz-executor db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8338c4ae) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_warn(2,0,ffffffff8334994d) at witness_warn+0x850 witness_debugger sys/kern/subr_witness.c:2576 [inline] witness_warn(2,0,ffffffff8334994d) at witness_warn+0x850 sys/kern/subr_witness.c:1485 userret(ffff80003b81c7d8) at userret+0x3a4 sys/kern/kern_sig.c:2227 syscall(ffff80003c4564f0) at syscall+0x9c0 mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff80003c4564f0) at syscall+0x9c0 sys/arch/amd64/amd64/trap.c:600 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfd32e9df580, count: 9 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: witness_warn ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8338c4ae) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_warn(2,0,ffffffff8334994d) at witness_warn+0x850 witness_debugger sys/kern/subr_witness.c:2576 [inline] witness_warn(2,0,ffffffff8334994d) at witness_warn+0x850 sys/kern/subr_witness.c:1485 userret(ffff80003b81c7d8) at userret+0x3a4 sys/kern/kern_sig.c:2227 syscall(ffff80003c4564f0) at syscall+0x9c0 mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff80003c4564f0) at syscall+0x9c0 sys/arch/amd64/amd64/trap.c:600 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfd32e9df580, count: -6 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c456220 rbx 0xffff8000299dedd7 rdx 0xffff80000002a580 rcx 0xffff80003b81c7d8 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0xdd1110085e5dbfdc r11 0x907831396b334741 r12 0xffff8000299debd8 r13 0 r14 0 r15 0x1 rip 0xffffffff81d1b595 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c456210 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=202685 pid=23293 tcnt=3 stat=onproc flags process=10 proc=4000000 runpri=32, usrpri=76, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003b81ca68,0xffffffff839e5600 process=0xffff800036bf84f8 user=0xffff80003c451000, vmspace=0xfffffd806a0015d0 estcpu=26, cpticks=5, pctcpu=0.0, user=0, sys=5, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 56937 64603 45212 0 3 0x100002 netlock ndp 58904 376464 93168 32767 7 0x10 syz-executor 58904 481281 93168 32767 3 0x4000010 netlock syz-executor 58904 508343 93168 32767 3 0x4000090 fsleep syz-executor 17234 281235 67924 32767 2 0x10 syz-executor 17234 100217 67924 32767 3 0x4000090 fsleep syz-executor 23293 282425 41680 32767 2 0x10 syz-executor 23293 443700 41680 32767 3 0x4000090 msgwait syz-executor *23293 202685 41680 32767 7 0x4000010 syz-executor 72845 479178 24544 32767 2 0x3010 syz-executor 45212 184663 7186 0 3 0x10008a sigsusp sh 50232 241930 19759 32767 2 0x10000010 syz-executor 34176 284428 4029 32767 2 0x10 syz-executor 34176 84604 4029 32767 3 0x4000090 lockf syz-executor 34176 184570 4029 32767 3 0x4000090 lockf syz-executor 34176 194337 4029 32767 3 0x4000090 fsleep syz-executor 67924 117772 56221 32767 3 0x90 nanoslp syz-executor 93168 453945 40200 32767 3 0x90 nanoslp syz-executor 31549 286217 21880 32767 2 0x10000010 syz-executor 7186 491177 7264 0 3 0x80 wait syz-executor 41680 229250 7521 32767 3 0x90 nanoslp syz-executor 4029 206179 46219 32767 2 0x10 syz-executor 24544 26095 38142 32767 3 0x90 nanoslp syz-executor 19759 7766 35149 0 3 0x82 wait syz-executor 56221 183029 35149 0 3 0x82 wait syz-executor 21880 516294 35149 0 3 0x82 wait syz-executor 40200 240965 35149 0 3 0x82 wait syz-executor 46219 507526 35149 0 3 0x82 wait syz-executor 7521 46421 35149 0 3 0x82 wait syz-executor 7264 463255 35149 0 3 0x82 wait syz-executor 38142 75209 35149 0 3 0x82 wait syz-executor 35149 183822 59554 0 3 0x82 kqread syz-executor 59554 167061 62587 0 3 0x10008a sigsusp ksh 62587 118871 28844 0 3 0x98 kqread sshd-session 28844 54284 14760 0 3 0x92 kqread sshd-session 24761 49933 1 0 3 0x100083 ttyin getty 14760 235915 1 0 3 0x88 kqread sshd 9817 407622 45463 73 3 0x1100090 kqread syslogd 45463 450895 1 0 3 0x100082 sbwait syslogd 29420 277618 1 0 3 0x100080 kqread resolvd 7789 170351 43684 77 3 0x100092 kqread dhcpleased 54030 116741 43684 77 3 0x100092 kqread dhcpleased 43684 151852 1 0 3 0x80 kqread dhcpleased 99170 105612 0 0 3 0x14200 bored smr 10832 117492 0 0 2 0x14200 zerothread 86944 410333 0 0 3 0x14200 aiodoned aiodoned 60724 142919 0 0 3 0x14200 syncer update 58657 329504 0 0 3 0x14200 cleaner cleaner 4751 115817 0 0 2 0x14200 reaper 13188 235269 0 0 3 0x14200 pgdaemon pagedaemon 61774 398825 0 0 3 0x14200 bored viomb 94539 224919 0 0 3 0x40014200 acpi0 acpi0 51742 135097 0 0 3 0x40014200 idle1 97663 345634 0 0 3 0x14200 bored softnet3 28946 279906 0 0 3 0x14200 bored softnet2 40640 269663 0 0 3 0x14200 bored softnet1 69966 20042 0 0 3 0x14200 bored softnet0 71507 197903 0 0 3 0x14200 bored systqmp 8501 118480 0 0 3 0x14200 bored systq 54818 126360 0 0 3 0x14200 tmoslp softclockmp 53869 401896 0 0 3 0x40014200 tmoslp softclock 10815 366907 0 0 3 0x40014200 idle0 1 419092 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 56937 (ndp) thread 0xffff80003b81c548 (64603) exclusive rwlock sysctllk r = 0 (0xffffffff8386cce8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310 #2 sysctl_vslock+0x45 sys/kern/kern_sysctl.c:189 #3 net_sysctl+0x5c2 sys/kern/uipc_domain.c:253 #4 sys_sysctl+0x3f2 sys/kern/kern_sysctl.c:-1 #5 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 #6 Xsyscall+0x128 Process 23293 (syz-executor) thread 0xffff80003b81c7d8 (202685) shared rwlock netlock r = 0 (0xffffffff8386dc30) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_read+0x36e sys/kern/kern_rwlock.c:397 #2 sysctl_file+0xb13 sys/kern/kern_sysctl.c:1767 #3 kern_sysctl+0x251 sys/kern/kern_sysctl.c:526 #4 sys_sysctl+0x3f2 sys/kern/kern_sysctl.c:-1 #5 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 #6 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10199 10956K 10966K 166960K 11277 0 pcb 17 12K 12K 166960K 17 0 rtable 236 6K 6K 166960K 345 0 pf 31 16K 16K 166960K 31 0 ifaddr 42 7K 7K 166960K 44 0 ifgroup 50 2K 2K 166960K 50 0 sysctl 1 1K 9K 166960K 5 0 counters 68 36K 36K 166960K 68 0 ioctlops 0 0K 2K 166960K 29 0 iov 0 0K 4K 166960K 3 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1334 84K 84K 166960K 1350 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 3 0 VM map 2 1K 1K 166960K 2 0 sem 3 0K 0K 166960K 4 0 dirhash 12 2K 2K 166960K 15 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 25 93K 113K 166960K 173 0 sigio 0 0K 0K 166960K 2 0 proc 58 79K 115K 166960K 476 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 9 0 in_multi 99 7K 7K 166960K 99 0 ether_multi 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 127 572K 572K 166960K 127 0 exec 0 0K 1K 166960K 341 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 255 170K 175K 166960K 3092 0 UVM aobj 4 2K 2K 166960K 4 0 pinsyscall 47 94K 107K 166960K 1175 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 1 0 NDP 27 2K 2K 166960K 27 0 temp 37 8682K 8747K 166960K 3778 0 kqueue 13 20K 26K 166960K 32 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 38 0 34 1 0 1 1 0 8 0 rtentry 176 112 0 1 6 0 6 6 0 8 0 unpcb 144 119 0 104 4 0 4 4 0 8 3 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 808 23 0 18 1 0 1 1 0 8 0 arp 128 19 0 0 1 0 1 1 0 8 0 inpcb 328 97 0 88 2 0 2 2 0 8 1 nd6 144 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 256 467 0 0 30 0 30 30 0 8 0 art_table 32 468 0 0 4 0 4 4 0 8 0 art_node 16 111 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 3 0 2 1 0 1 1 0 8 0 semapl 112 1 0 0 1 0 1 1 0 8 0 shmpl 112 1 0 0 1 0 1 1 0 8 0 dirhash 1024 19 0 2 3 0 3 3 0 8 0 dino2pl 256 1586 0 83 95 0 95 95 0 8 0 ffsino 288 1586 0 83 108 0 108 108 0 8 0 nchpl 144 1806 0 127 63 0 63 63 0 8 0 uvmvnodes 80 1667 0 0 35 0 35 35 0 8 0 vnodes 216 1667 0 0 93 0 93 93 0 8 0 namei 1024 5349 0 5349 1 0 1 1 0 8 1 percpumem 16 49 0 0 1 0 1 1 0 8 0 kstatmem 264 24 0 0 2 0 2 2 0 8 0 scxspl 216 5813 0 5813 3 1 2 2 1 8 2 plimitpl 152 40 0 16 2 0 2 2 0 8 1 sigapl 424 446 0 389 7 0 7 7 0 8 0 knotepl 120 311 0 0 10 0 10 10 0 8 0 kqueuepl 224 32 0 23 1 0 1 1 0 8 0 pipepl 336 99 0 72 3 0 3 3 0 8 0 fdescpl 520 428 0 391 3 0 3 3 0 8 0 filepl 160 1545 0 1335 12 0 12 12 0 8 3 lockfpl 104 11 0 4 1 0 1 1 0 8 0 lockfspl 48 6 0 2 1 0 1 1 0 8 0 sessionpl 144 21 0 5 1 0 1 1 0 8 0 pgrppl 48 29 0 5 1 0 1 1 0 8 0 ucredpl 104 144 0 126 1 0 1 1 0 8 0 zombiepl 144 392 0 389 1 0 1 1 0 8 0 processpl 1240 446 0 389 5 0 5 5 0 8 0 procpl 656 511 0 445 6 0 6 6 0 8 0 sockpl 728 254 0 223 9 0 9 9 0 8 5 mcl64k 65536 1 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 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 132 0 0 17 0 17 17 0 8 0 mcl2k 2048 18 0 0 3 0 3 3 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 1145 0 0 72 0 72 72 0 8 0 bufpl 280 2268 0 116 154 0 154 154 0 8 0 anonpl 32 3687 0 0 30 0 30 30 0 246 0 amapchunkpl 152 8742 0 8205 22 0 22 22 0 158 1 amappl16 200 1774 0 1759 5 0 5 5 0 8 4 amappl15 192 2 0 2 1 0 1 1 0 8 1 amappl14 184 103 0 91 1 0 1 1 0 8 0 amappl13 176 4 0 4 1 0 1 1 0 8 1 amappl12 168 1027 0 990 2 0 2 2 0 8 0 amappl11 160 47 0 37 1 0 1 1 0 8 0 amappl10 152 4 0 4 1 0 1 1 0 8 1 amappl9 144 241 0 241 1 0 1 1 0 8 1 amappl8 136 27 0 26 1 0 1 1 0 8 0 amappl7 128 119 0 108 1 0 1 1 0 8 0 amappl6 120 168 0 164 1 0 1 1 0 8 0 amappl5 112 129 0 123 1 0 1 1 0 8 0 amappl4 104 295 0 279 1 0 1 1 0 8 0 amappl3 96 1388 0 1263 4 0 4 4 0 8 0 amappl2 88 595 0 538 2 0 2 2 0 8 0 amappl1 80 7840 0 7242 13 0 13 13 0 8 0 amappl 88 2472 0 2288 5 0 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 428 0 391 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 428 0 391 1 0 1 1 0 8 0 vmmpekpl 168 4976 0 4945 2 0 2 2 0 8 0 vmmpepl 168 33492 0 31416 95 0 95 95 0 357 2 vmsppl 480 427 0 391 7 1 6 6 0 8 0 rwobjpl 72 13652 0 11104 47 0 47 47 0 8 0 pdppl 4096 864 0 782 104 12 92 92 0 8 10 pvpl 32 10358 0 0 85 1 84 85 0 265 0 pmappl 256 427 0 391 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 449 0 15 13 0 13 13 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff837eeff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 end of kernel end trace frame: 0x7d8c0aa46de0, count: 12 ddb{0}> trace x86_ipi_db(ffffffff837eeff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 end of kernel end trace frame: 0x7d8c0aa46de0, count: -3 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8338c4ae) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_warn(2,0,ffffffff8334994d) at witness_warn+0x850 witness_debugger sys/kern/subr_witness.c:2576 [inline] witness_warn(2,0,ffffffff8334994d) at witness_warn+0x850 sys/kern/subr_witness.c:1485 userret(ffff80003b81c7d8) at userret+0x3a4 sys/kern/kern_sig.c:2227 syscall(ffff80003c4564f0) at syscall+0x9c0 mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff80003c4564f0) at syscall+0x9c0 sys/arch/amd64/amd64/trap.c:600 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfd32e9df580, count: 9 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8338c4ae) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_warn(2,0,ffffffff8334994d) at witness_warn+0x850 witness_debugger sys/kern/subr_witness.c:2576 [inline] witness_warn(2,0,ffffffff8334994d) at witness_warn+0x850 sys/kern/subr_witness.c:1485 userret(ffff80003b81c7d8) at userret+0x3a4 sys/kern/kern_sig.c:2227 syscall(ffff80003c4564f0) at syscall+0x9c0 mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff80003c4564f0) at syscall+0x9c0 sys/arch/amd64/amd64/trap.c:600 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfd32e9df580, count: -6