witness: userret: returning with the following locks held: exclusive rwlock solock r = 0 (0xfffffd80674d9e00) #0 witness_lock+0x44d #1 unp_solock_peer+0xa6 sys/kern/uipc_usrreq.c:163 #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: wWiAtRNnIeNssG:_ wSaPrnL NOSTto pLpOWeEd REatD ON SYSCALL 95 14 EXIT 0 9 db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *118589 4883 32767 0x10 0x4000000 0 syz-executor.5 277820 5028 73 0x1100010 0 1 syslogd 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(ffff8000fffef508) at userret+0x265 sys/kern/kern_sig.c:2012 syscall(ffff80002e4c0af0) at syscall+0x57e mi_syscall_return sys/sys/syscall_mi.h:128 [inline] syscall(ffff80002e4c0af0) at syscall+0x57e sys/arch/amd64/amd64/trap.c:607 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2db62ffa60, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic *cpu0: witness_warn ddb{0}> 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(ffff8000fffef508) at userret+0x265 sys/kern/kern_sig.c:2012 syscall(ffff80002e4c0af0) at syscall+0x57e mi_syscall_return sys/sys/syscall_mi.h:128 [inline] syscall(ffff80002e4c0af0) at syscall+0x57e sys/arch/amd64/amd64/trap.c:607 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2db62ffa60, count: -6 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff80002e4c0820 rbx 0xffffffff82926bb7 cpu_info_full_primary+0x2bb7 rdx 0xffff800000d1ae40 rcx 0 rax 0xffff8000fffef508 r8 0x101010101010101 r9 0x8080808080808080 r10 0x4b3e10c5d5c68b8b r11 0xb83aefc1652ed74e r12 0xffffffff829269b8 cpu_info_full_primary+0x29b8 r13 0 r14 0 r15 0x1 rip 0xffffffff81844108 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e4c0810 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.5) pid=118589 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800021258d30,0xffff8000fffec2b0 process=0xffff8000ffff2dc8 user=0xffff80002e4bb000, vmspace=0xfffffd806efde008 estcpu=36, cpticks=5, pctcpu=0.0 user=0, sys=5, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 73113 374123 52373 32767 2 0x10 syz-executor.6 60898 522827 69892 32767 2 0x10 syz-executor.3 60898 89173 69892 32767 2 0x4000010 syz-executor.3 4883 509978 97510 32767 2 0x10 syz-executor.5 * 4883 118589 97510 32767 7 0x4000010 syz-executor.5 44142 235948 60628 32767 2 0x10 syz-executor.2 44142 376268 60628 32767 3 0x4000090 fsleep syz-executor.2 44142 359047 60628 32767 3 0x4000090 netcon2 syz-executor.2 67051 247413 74670 32767 2 0x10 syz-executor.1 67051 385356 74670 32767 3 0x4000090 fsleep syz-executor.1 4323 216585 65247 32767 2 0x490 syz-executor.4 4323 511932 65247 32767 3 0x4000090 kqsel syz-executor.4 4323 459044 65247 32767 3 0x4000090 fsleep syz-executor.4 60628 148935 76300 32767 2 0x490 syz-executor.2 76300 173174 23886 0 3 0x82 wait syz-executor.2 24553 27852 73607 32767 3 0x90 piperd syz-executor.0 73607 28651 23886 0 3 0x82 wait syz-executor.0 65247 90450 99364 32767 2 0x490 syz-executor.4 99364 235392 23886 0 3 0x82 wait syz-executor.4 91200 466003 25164 32767 3 0x90 piperd syz-executor.7 25164 35640 23886 0 3 0x82 wait syz-executor.7 97510 404399 2312 32767 2 0x490 syz-executor.5 2312 407134 23886 0 3 0x82 wait syz-executor.5 69892 185999 8974 32767 3 0x90 nanoslp syz-executor.3 8974 139848 23886 0 3 0x82 wait syz-executor.3 39222 241870 0 0 3 0x14200 bored sosplice 52373 230905 63516 32767 2 0x10 syz-executor.6 63516 305366 23886 0 3 0x82 wait syz-executor.6 74670 97313 70234 32767 2 0x490 syz-executor.1 70234 312395 23886 0 3 0x82 wait syz-executor.1 23886 409491 78118 0 2 0x82 syz-fuzzer 23886 61253 78118 0 3 0x4000082 thrsleep syz-fuzzer 23886 64474 78118 0 3 0x4000082 thrsleep syz-fuzzer 23886 331096 78118 0 3 0x4000082 thrsleep syz-fuzzer 23886 506037 78118 0 3 0x4000082 thrsleep syz-fuzzer 23886 44317 78118 0 3 0x4000082 thrsleep syz-fuzzer 23886 267764 78118 0 3 0x4000082 thrsleep syz-fuzzer 23886 84456 78118 0 3 0x4000082 thrsleep syz-fuzzer 23886 413945 78118 0 3 0x4000082 thrsleep syz-fuzzer 78118 158918 27317 0 3 0x10008a sigsusp ksh 27317 18907 95592 0 3 0x9a kqread sshd 75558 32637 1 0 3 0x100083 ttyin getty 95592 20607 1 0 3 0x88 kqread sshd 5028 277820 42429 73 7 0x1100010 syslogd 42429 195509 1 0 3 0x100082 netio syslogd 76817 500251 1 0 3 0x100080 kqread resolvd 13139 307243 76175 77 3 0x100092 kqread dhcpleased 48059 521366 76175 77 3 0x100092 kqread dhcpleased 76175 513415 1 0 3 0x80 kqread dhcpleased 84083 471007 0 0 3 0x14200 bored smr 91290 412123 0 0 2 0x14200 zerothread 60216 211166 0 0 3 0x14200 aiodoned aiodoned 82903 110502 0 0 3 0x14200 syncer update 68499 413308 0 0 3 0x14200 cleaner cleaner 70586 347198 0 0 3 0x14200 reaper reaper 54781 328895 0 0 3 0x14200 pgdaemon pagedaemon 86055 66195 0 0 3 0x14200 bored viomb 93822 516439 0 0 3 0x40014200 acpi0 acpi0 32510 285421 0 0 3 0x40014200 idle1 11588 484199 0 0 3 0x14200 bored softnet 96427 336314 0 0 3 0x14200 bored softnet 3387 95945 0 0 3 0x14200 bored softnet 34974 43634 0 0 3 0x14200 bored softnet 66363 159070 0 0 3 0x14200 bored systqmp 6410 396308 0 0 3 0x14200 bored systq 2966 237225 0 0 2 0x40014200 softclock 58265 28557 0 0 3 0x40014200 idle0 1 264846 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 1: exclusive mutex &bq->bufq_mtx r = 0 (0xffff80000019f168) #0 witness_lock+0x44d #1 mtx_enter_try+0x100 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 bufq_queue+0x26 sys/kern/kern_bufq.c:182 #4 sdstrategy+0x178 sys/scsi/sd.c:567 #5 spec_strategy+0x75 sys/kern/spec_vnops.c:456 #6 VOP_STRATEGY+0x9b sys/kern/vfs_vops.c:628 #7 bwrite+0x1f0 sys/kern/vfs_bio.c:763 #8 ffs_update+0x27d sys/ufs/ffs/ffs_inode.c:113 #9 VOP_FSYNC+0xce sys/kern/vfs_vops.c:311 #10 sys_fsync+0x109 sys/kern/vfs_syscalls.c:2939 #11 syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline] #11 syscall+0x435 sys/arch/amd64/amd64/trap.c:585 #12 Xsyscall+0x128 Process 4883 (syz-executor.5) thread 0xffff8000fffef508 (118589) exclusive rwlock solock r = 0 (0xfffffd80674d9e00) #0 witness_lock+0x44d #1 unp_solock_peer+0xa6 sys/kern/uipc_usrreq.c:163 #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 5028 (syslogd) thread 0xffff8000ffff77b0 (277820) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829fba28) #0 witness_lock+0x44d #1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:227 #2 mi_switch+0x3bb sys/kern/sched_bsd.c:416 #3 sleep_finish+0x180 sys/kern/kern_synch.c:420 #4 tsleep+0x12c sys/kern/kern_synch.c:158 #5 vwaitforio+0x98 sys/kern/vfs_subr.c:1897 #6 ffs_fsync+0x38e sys/ufs/ffs/ffs_vnops.c:495 #7 VOP_FSYNC+0xce sys/kern/vfs_vops.c:311 #8 sys_fsync+0x109 sys/kern/vfs_syscalls.c:2939 #9 syscall+0x435 mi_syscall sys/sys/syscall_mi.h:101 [inline] #9 syscall+0x435 sys/arch/amd64/amd64/trap.c:585 #10 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806e6d9f80) #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{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10207 6412K 6420K 78643K 11365 0 pcb 13 16K 20K 78643K 19 0 rtable 238 6K 7K 78643K 1310 0 ifaddr 81 17K 17K 78643K 238 0 sysctl 3 1K 1K 78643K 3 0 counters 56 35K 35K 78643K 100 0 ioctlops 0 0K 2K 78643K 102 0 iov 0 0K 20K 78643K 1559 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 5 0 vnodes 1271 79K 79K 78643K 4655 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 97 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 2247 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 24 89K 121K 78643K 8299 0 sigio 0 0K 0K 78643K 268 0 proc 56 78K 115K 78643K 1593 0 subproc 104 6K 6K 78643K 390 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 835 0 in_multi 99 6K 6K 78643K 446 0 ether_multi 1 0K 0K 78643K 34 0 mrt 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 241 1076K 1076K 78643K 241 0 exec 0 0K 2K 78643K 2781 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 282 85K 102K 78643K 52351 0 UVM aobj 131 8K 8K 78643K 141 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 323 0 NDP 11 0K 2K 78643K 93 0 temp 125 4726K 4806K 78643K 24310 0 kqueue 12 18K 28K 78643K 866 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 120 689 0 686 11 10 1 3 0 8 0 rtentry 112 362 0 250 4 0 4 4 0 8 0 unpcb 144 6059 0 6044 79 76 3 6 0 8 2 syncache 296 85 0 85 22 21 1 1 0 8 1 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 111 0 111 12 11 1 1 0 8 1 tcpcb 736 6151 0 6074 193 185 8 18 0 8 1 arp 120 64 0 46 1 0 1 1 0 8 0 ipq 40 1 0 1 1 1 0 1 0 8 0 ipqe 40 1 0 1 1 1 0 1 0 8 0 inpcb 320 12687 0 12679 230 224 6 20 0 8 5 ip6q 72 6 0 6 2 2 0 1 0 8 0 ip6af 40 18 0 18 2 2 0 1 0 8 0 nd6 48 97 0 71 1 0 1 1 0 8 0 kcovpl 48 30 0 22 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1461 0 988 30 0 30 30 0 8 0 art_table 32 1462 0 988 4 0 4 4 0 8 0 art_node 16 361 0 259 1 0 1 1 0 8 0 sysvmsgpl 40 28 0 25 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 2245 0 2235 1 0 1 1 0 8 0 shmpl 112 138 0 10 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 13735 0 12281 92 0 92 92 0 8 0 ffsino 272 13735 0 12281 98 0 98 98 0 8 0 nchpl 144 25044 0 23408 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 92934 0 92934 6 5 1 2 0 8 1 percpumem 16 62 0 22 1 0 1 1 0 8 0 kstatmem 264 66 0 44 2 0 2 2 0 8 0 scxspl 216 86705 0 86705 28 27 1 8 0 8 1 plimitpl 152 1701 0 1679 4 3 1 2 0 8 0 sigapl 424 8533 0 8480 8 1 7 7 0 8 0 futexpl 64 73086 0 73083 5 4 1 1 0 8 0 knotepl 120 1091 0 0 18 2 16 17 0 8 0 kqueuepl 224 2759 0 2750 60 59 1 7 0 8 0 pipepl 336 2450 0 2422 89 86 3 13 0 8 0 fdescpl 496 8515 0 8480 6 1 5 6 0 8 0 filepl 152 69227 0 68988 199 185 14 20 0 8 4 lockfpl 104 1482 0 1480 3 2 1 2 0 8 0 lockfspl 48 326 0 324 1 0 1 1 0 8 0 sessionpl 144 45 0 29 1 0 1 1 0 8 0 pgrppl 48 116 0 100 1 0 1 1 0 8 0 ucredpl 104 18490 0 18472 1 0 1 1 0 8 0 zombiepl 144 8480 0 8480 1 0 1 1 0 8 1 processpl 1064 8533 0 8480 5 1 4 5 0 8 0 procpl 672 25064 0 24996 17 10 7 8 0 8 0 sosppl 168 103 0 103 21 20 1 1 0 8 1 sockpl 504 19599 0 19570 476 464 12 32 0 8 8 mcl64k 65536 33 0 0 4 1 3 3 0 8 0 mcl16k 16384 17 0 0 3 1 2 3 0 8 0 mcl12k 12288 23 0 0 2 0 2 2 0 8 0 mcl9k 9216 25 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 30 0 0 4 1 3 3 0 8 0 mcl2k2 2112 12 0 0 1 0 1 1 0 8 0 mcl2k 2048 328 0 0 18 1 17 18 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 1222 0 0 44 15 29 44 0 8 1 bufpl 288 18572 0 12242 453 0 453 453 0 8 0 anonpl 24 1817633 0 1805197 288 192 96 109 0 186 0 amapchunkpl 152 163981 0 163408 156 126 30 48 0 158 3 amappl16 200 28562 0 28173 215 194 21 35 0 8 0 amappl15 192 1712 0 1709 1 0 1 1 0 8 0 amappl14 184 621 0 617 1 0 1 1 0 8 0 amappl13 176 1082 0 1079 1 0 1 1 0 8 0 amappl12 168 945 0 936 1 0 1 1 0 8 0 amappl11 160 1626 0 1608 1 0 1 1 0 8 0 amappl10 152 893 0 881 2 1 1 1 0 8 0 amappl9 144 1310 0 1302 1 0 1 1 0 8 0 amappl8 136 2002 0 1902 4 0 4 4 0 8 0 amappl7 128 1051 0 1040 1 0 1 1 0 8 0 amappl6 120 1177 0 1150 2 1 1 2 0 8 0 amappl5 112 7065 0 7044 1 0 1 1 0 8 0 amappl4 104 3199 0 3172 2 1 1 2 0 8 0 amappl3 96 27386 0 27324 2 0 2 2 0 8 0 amappl2 88 10710 0 10637 4 2 2 3 0 8 0 amappl1 80 206421 0 205724 29 13 16 19 0 8 0 amappl 88 51200 0 51027 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 72 140 0 10 3 0 3 3 0 8 0 uaddrrnd 24 8515 0 8480 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 8515 0 8480 1 0 1 1 0 8 0 vmmpekpl 168 74468 0 74414 3 0 3 3 0 8 0 vmmpepl 168 848276 0 845531 320 191 129 140 0 357 2 vmsppl 368 8514 0 8480 4 0 4 4 0 8 0 rwobjpl 56 221161 0 213691 121 11 110 110 0 8 0 pdppl 4096 17037 0 16960 569 488 81 93 0 8 4 pvpl 32 3558558 0 3540673 593 421 172 240 0 265 6 pmappl 248 8514 0 8480 3 0 3 3 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 2093 0 1249 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: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(ffff8000fffef508) at userret+0x265 sys/kern/kern_sig.c:2012 syscall(ffff80002e4c0af0) at syscall+0x57e mi_syscall_return sys/sys/syscall_mi.h:128 [inline] syscall(ffff80002e4c0af0) at syscall+0x57e sys/arch/amd64/amd64/trap.c:607 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x2db62ffa60, count: -6 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 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x68 savectx() at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffd12f0, count: 10 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 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x68 savectx() at savectx+0xb1 end of kernel end trace frame: 0x7f7ffffd12f0, count: -5