witness: userret: returning with the following locks held: exclusive rwlock solock r = 0 (0xfffffd8069616c00) #0 witness_lock+0x44d #1 unp_solock_peer+0x64 sys/kern/uipc_usrreq.c:168 #2 uipc_usrreq+0x7c6 sys/kern/uipc_usrreq.c:350 #3 sosend+0x61b sys/kern/uipc_socket.c:657 #4 sendit+0x65d sys/kern/uipc_syscalls.c:682 #5 sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:589 #6 syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] #6 syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 #7 Xsyscall+0x128 panic: witness_warn Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *482901 8247 32767 0x10 0x4000000 1 syz-executor.4 213591 82254 32767 0x10 0x4000000 0 syz-executor.2 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82595df3) at panic+0x177 sys/kern/subr_prf.c:202 witness_warn(2,0,ffffffff8262507e) at witness_warn+0x65e witness_debugger sys/kern/subr_witness.c:2505 [inline] witness_warn(2,0,ffffffff8262507e) at witness_warn+0x65e sys/kern/subr_witness.c:1473 userret(ffff8000ffff6010) at userret+0x265 sys/kern/kern_sig.c:2012 syscall(ffff800023350d50) at syscall+0x57e mi_syscall_return sys/sys/syscall_mi.h:128 [inline] syscall(ffff800023350d50) at syscall+0x57e sys/arch/amd64/amd64/trap.c:607 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1a80bade650, 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+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82595df3) at panic+0x177 sys/kern/subr_prf.c:202 witness_warn(2,0,ffffffff8262507e) at witness_warn+0x65e witness_debugger sys/kern/subr_witness.c:2505 [inline] witness_warn(2,0,ffffffff8262507e) at witness_warn+0x65e sys/kern/subr_witness.c:1473 userret(ffff8000ffff6010) at userret+0x265 sys/kern/kern_sig.c:2012 syscall(ffff800023350d50) at syscall+0x57e mi_syscall_return sys/sys/syscall_mi.h:128 [inline] syscall(ffff800023350d50) at syscall+0x57e sys/arch/amd64/amd64/trap.c:607 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1a80bade650, count: -6 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800023350a80 rbx 0xffff800020dd9bb7 rdx 0xffff800000bd97c0 rcx 0 rax 0xffff8000ffff6010 r8 0x101010101010101 r9 0x8080808080808080 r10 0xd5dc409b4d734af7 r11 0x62ba107985b83ac8 r12 0xffff800020dd99b8 r13 0 r14 0 r15 0x1 rip 0xffffffff81844108 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800023350a70 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.4) pid=482901 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000fffee540,0xffff8000ffff6560 process=0xffff8000ffff1900 user=0xffff80002334b000, vmspace=0xfffffd806eec4738 estcpu=36, cpticks=5, pctcpu=0.0 user=0, sys=5, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 84532 362985 84034 32767 2 0x10 syz-executor.6 46553 358654 48505 32767 2 0x10 syz-executor.5 8247 214191 88270 32767 2 0x10 syz-executor.4 * 8247 482901 88270 32767 7 0x4000010 syz-executor.4 61083 157398 608 32767 2 0x10 syz-executor.1 61083 266947 608 32767 3 0x4000090 fsleep syz-executor.1 61083 405591 608 32767 3 0x4000090 fsleep syz-executor.1 82254 24988 28181 32767 2 0x10 syz-executor.2 82254 213591 28181 32767 7 0x4000010 syz-executor.2 608 420370 89034 32767 3 0x90 nanoslp syz-executor.1 89034 152182 7926 0 3 0x82 wait syz-executor.1 28181 433731 95305 32767 3 0x90 nanoslp syz-executor.2 95305 122966 7926 0 3 0x82 wait syz-executor.2 36324 18296 33822 32767 3 0x90 nanoslp syz-executor.3 33822 223284 7926 0 3 0x82 wait syz-executor.3 47127 430714 0 0 3 0x14200 bored sosplice 84034 279372 47003 32767 2 0x10 syz-executor.6 47003 189479 7926 0 3 0x82 wait syz-executor.6 48505 504985 21182 32767 2 0x490 syz-executor.5 98424 82819 7926 0 3 0x82 wait syz-executor.7 88270 292528 77043 32767 3 0x90 nanoslp syz-executor.4 21182 289047 7926 0 3 0x82 wait syz-executor.5 77043 400888 7926 0 3 0x82 wait syz-executor.4 76000 92322 20037 32767 3 0x90 nanoslp syz-executor.0 20037 133047 7926 0 3 0x82 wait syz-executor.0 7926 359462 90376 0 3 0x82 thrsleep syz-fuzzer 7926 181437 90376 0 3 0x4000082 nanoslp syz-fuzzer 7926 49050 90376 0 3 0x4000082 thrsleep syz-fuzzer 7926 324451 90376 0 3 0x4000082 kqread syz-fuzzer 7926 61984 90376 0 2 0x4000082 syz-fuzzer 7926 481105 90376 0 3 0x4000082 thrsleep syz-fuzzer 7926 487250 90376 0 3 0x4000082 thrsleep syz-fuzzer 7926 321018 90376 0 3 0x4000082 thrsleep syz-fuzzer 7926 154836 90376 0 3 0x4000082 thrsleep syz-fuzzer 7926 179741 90376 0 3 0x4000082 thrsleep syz-fuzzer 90376 438933 83540 0 3 0x10008a sigsusp ksh 83540 215735 94910 0 2 0x9a sshd 81396 225357 1 0 3 0x100083 ttyin getty 94910 218899 1 0 3 0x88 kqread sshd 80589 509086 69580 73 3 0x1100010 ffs_fsync syslogd 69580 42781 1 0 3 0x100082 netio syslogd 58508 81740 1 0 3 0x100080 kqread resolvd 54864 55443 65975 77 3 0x100092 kqread dhcpleased 17881 177019 65975 77 3 0x100092 kqread dhcpleased 65975 510449 1 0 3 0x80 kqread dhcpleased 81371 429340 0 0 2 0x40014200 smr 468 231427 0 0 2 0x14200 zerothread 18262 42501 0 0 3 0x14200 aiodoned aiodoned 52436 375980 0 0 3 0x14200 syncer update 41203 13910 0 0 3 0x14200 cleaner cleaner 41570 369130 0 0 2 0x14200 reaper 18560 340304 0 0 3 0x14200 pgdaemon pagedaemon 51999 347567 0 0 3 0x14200 bored viomb 42042 234936 0 0 3 0x40014200 acpi0 acpi0 97771 31121 0 0 3 0x40014200 idle1 15415 282563 0 0 3 0x14200 bored softnet 73615 19481 0 0 3 0x14200 bored softnet 31853 1871 0 0 3 0x14200 bored softnet 48153 461479 0 0 3 0x14200 bored softnet 65735 408483 0 0 3 0x14200 bored systqmp 38238 364446 0 0 3 0x14200 bored systq 70580 430955 0 0 3 0x40014200 bored softclock 52106 170166 0 0 3 0x40014200 idle0 1 503844 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 8247 (syz-executor.4) thread 0xffff8000ffff6010 (482901) exclusive rwlock solock r = 0 (0xfffffd8069616c00) #0 witness_lock+0x44d #1 unp_solock_peer+0x64 sys/kern/uipc_usrreq.c:168 #2 uipc_usrreq+0x7c6 sys/kern/uipc_usrreq.c:350 #3 sosend+0x61b sys/kern/uipc_socket.c:657 #4 sendit+0x65d sys/kern/uipc_syscalls.c:682 #5 sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:589 #6 syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] #6 syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 #7 Xsyscall+0x128 Process 80589 (syslogd) thread 0xffff8000ffff7cf0 (509086) exclusive rrwlock inode r = 0 (0xfffffd806e6e1e70) #0 witness_lock+0x44d #1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0x8b sys/kern/kern_rwlock.c:465 #3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:518 #4 vn_lock+0x84 sys/kern/vfs_vnops.c:567 #5 sys_fsync+0xf5 sys/kern/vfs_syscalls.c:2939 #6 syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline] #6 syscall+0x435 sys/arch/amd64/amd64/trap.c:585 #7 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10205 6412K 6420K 78643K 11321 0 pcb 13 12K 14K 78643K 17 0 rtable 238 6K 7K 78643K 945 0 ifaddr 81 17K 17K 78643K 139 0 sysctl 3 1K 1K 78643K 3 0 counters 56 35K 35K 78643K 72 0 ioctlops 0 0K 2K 78643K 195 0 iov 0 0K 28K 78643K 1216 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1271 79K 79K 78643K 3152 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 68 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 1148 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 24 89K 109K 78643K 6173 0 sigio 0 0K 0K 78643K 46 0 proc 56 78K 127K 78643K 1162 0 subproc 104 6K 6K 78643K 208 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 12010 0 in_multi 99 6K 7K 78643K 312 0 ether_multi 1 0K 0K 78643K 24 0 mrt 2 0K 0K 78643K 2 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 229 1023K 1023K 78643K 229 0 exec 0 0K 2K 78643K 1622 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 297 88K 100K 78643K 39451 0 UVM aobj 131 8K 8K 78643K 161 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 257 0 NDP 11 0K 2K 78643K 51 0 temp 124 4726K 4790K 78643K 17712 0 kqueue 12 18K 28K 78643K 568 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 120 533 0 465 8 5 3 3 0 8 0 rtentry 112 205 0 93 4 0 4 4 0 8 0 unpcb 144 6426 0 6411 71 62 9 10 0 8 8 syncache 296 61 0 61 10 9 1 1 0 8 1 tcpqe 32 48 0 48 7 6 1 1 0 8 1 tcpcb 736 7273 0 7147 122 110 12 20 0 8 0 arp 120 36 0 18 1 0 1 1 0 8 0 inpcb 320 9795 0 9707 79 71 8 15 0 8 0 nd6 48 52 0 26 1 0 1 1 0 8 0 kcovpl 48 16 0 8 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 826 0 365 30 0 30 30 0 8 1 art_table 32 827 0 365 4 0 4 4 0 8 0 art_node 16 204 0 102 1 0 1 1 0 8 0 semapl 112 1146 0 1136 1 0 1 1 0 8 0 shmpl 112 158 0 30 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 10291 0 8845 91 0 91 91 0 8 0 ffsino 272 10291 0 8845 97 0 97 97 0 8 0 nchpl 144 18740 0 17100 63 0 63 63 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 65705 0 65705 2 1 1 2 0 8 1 percpumem 16 48 0 8 1 0 1 1 0 8 0 kstatmem 264 38 0 16 2 0 2 2 0 8 0 scxspl 216 49883 0 49882 27 24 3 8 0 8 2 plimitpl 152 1324 0 1302 10 9 1 2 0 8 0 sigapl 424 6435 0 6381 7 0 7 7 0 8 0 futexpl 64 57873 0 57871 1 0 1 1 0 8 0 knotepl 120 644 0 0 17 0 17 17 0 8 0 kqueuepl 224 1960 0 1952 34 33 1 9 0 8 0 pipepl 336 2155 0 2127 46 43 3 8 0 8 0 fdescpl 496 6417 0 6382 7 2 5 6 0 8 0 filepl 152 52043 0 51673 86 68 18 19 0 8 3 lockfpl 104 1145 0 1143 2 1 1 2 0 8 0 lockfspl 48 272 0 270 1 0 1 1 0 8 0 sessionpl 144 31 0 15 1 0 1 1 0 8 0 pgrppl 48 532 0 516 1 0 1 1 0 8 0 ucredpl 104 10243 0 10225 1 0 1 1 0 8 0 zombiepl 144 6384 0 6381 1 0 1 1 0 8 0 processpl 1064 6435 0 6381 4 0 4 4 0 8 0 procpl 672 19070 0 19000 17 9 8 8 0 8 1 sosppl 168 72 0 72 8 7 1 1 0 8 1 sockpl 504 16883 0 16712 400 378 22 34 0 8 0 mcl64k 65536 25 0 0 4 1 3 3 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 20 0 0 2 0 2 2 0 8 0 mcl8k 8192 23 0 0 3 1 2 3 0 8 0 mcl4k 4096 29 0 0 3 1 2 3 0 8 0 mcl2k2 2112 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 193 0 0 18 0 18 18 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 576 0 0 29 0 29 29 0 8 0 bufpl 288 12580 0 6250 453 0 453 453 0 8 0 anonpl 24 1412381 0 1399732 196 96 100 120 0 186 0 amapchunkpl 152 113313 0 112709 58 32 26 38 0 158 0 amappl16 200 27054 0 26666 178 156 22 40 0 8 1 amappl15 192 740 0 736 1 0 1 1 0 8 0 amappl14 184 1055 0 1048 1 0 1 1 0 8 0 amappl13 176 137 0 133 1 0 1 1 0 8 0 amappl12 168 559 0 553 2 1 1 1 0 8 0 amappl11 160 1149 0 1130 1 0 1 1 0 8 0 amappl10 152 731 0 726 1 0 1 1 0 8 0 amappl9 144 2003 0 1996 1 0 1 1 0 8 0 amappl8 136 2121 0 2027 4 0 4 4 0 8 0 amappl7 128 1365 0 1348 1 0 1 1 0 8 0 amappl6 120 1776 0 1753 2 1 1 2 0 8 0 amappl5 112 5183 0 5169 1 0 1 1 0 8 0 amappl4 104 3271 0 3235 2 0 2 2 0 8 0 amappl3 96 19931 0 19870 2 0 2 2 0 8 0 amappl2 88 7504 0 7428 3 1 2 3 0 8 0 amappl1 80 156229 0 155519 26 10 16 19 0 8 0 amappl 88 38589 0 38408 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 72 160 0 30 3 0 3 3 0 8 0 uaddrrnd 24 6417 0 6381 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 6417 0 6381 1 0 1 1 0 8 0 vmmpekpl 168 59830 0 59776 3 0 3 3 0 8 0 vmmpepl 168 642874 0 640067 206 75 131 139 0 357 4 vmsppl 368 6416 0 6381 4 0 4 4 0 8 0 rwobjpl 56 173686 0 166214 116 8 108 110 0 8 0 pdppl 4096 12841 0 12762 221 140 81 87 0 8 2 pvpl 32 2600030 0 2582094 336 165 171 246 0 265 0 pmappl 248 6416 0 6381 4 1 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 1533 0 677 25 0 25 25 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff82925ff0) 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 __mp_lock(ffffffff829fb820) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829fb820) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff80002335caa0,ffff80000004bd00) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge21_untramp() at Xintr_ioapic_edge21_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xc sys/dev/kcov.c:144 syscall(ffff80002335cc80) at syscall+0x41d mi_syscall sys/sys/syscall_mi.h:100 [inline] syscall(ffff80002335cc80) at syscall+0x41d sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xea5ae9578c0, count: 6 ddb{0}> trace x86_ipi_db(ffffffff82925ff0) 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 __mp_lock(ffffffff829fb820) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff829fb820) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff80002335caa0,ffff80000004bd00) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge21_untramp() at Xintr_ioapic_edge21_untramp+0x18f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xc sys/dev/kcov.c:144 syscall(ffff80002335cc80) at syscall+0x41d mi_syscall sys/sys/syscall_mi.h:100 [inline] syscall(ffff80002335cc80) at syscall+0x41d sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xea5ae9578c0, count: -9 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(ffffffff82595df3) at panic+0x177 sys/kern/subr_prf.c:202 witness_warn(2,0,ffffffff8262507e) at witness_warn+0x65e witness_debugger sys/kern/subr_witness.c:2505 [inline] witness_warn(2,0,ffffffff8262507e) at witness_warn+0x65e sys/kern/subr_witness.c:1473 userret(ffff8000ffff6010) at userret+0x265 sys/kern/kern_sig.c:2012 syscall(ffff800023350d50) at syscall+0x57e mi_syscall_return sys/sys/syscall_mi.h:128 [inline] syscall(ffff800023350d50) at syscall+0x57e sys/arch/amd64/amd64/trap.c:607 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1a80bade650, count: 9 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff82595df3) at panic+0x177 sys/kern/subr_prf.c:202 witness_warn(2,0,ffffffff8262507e) at witness_warn+0x65e witness_debugger sys/kern/subr_witness.c:2505 [inline] witness_warn(2,0,ffffffff8262507e) at witness_warn+0x65e sys/kern/subr_witness.c:1473 userret(ffff8000ffff6010) at userret+0x265 sys/kern/kern_sig.c:2012 syscall(ffff800023350d50) at syscall+0x57e mi_syscall_return sys/sys/syscall_mi.h:128 [inline] syscall(ffff800023350d50) at syscall+0x57e sys/arch/amd64/amd64/trap.c:607 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x1a80bade650, count: -6