witness: thread 0xffff800020b29650 exiting with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd80689e9b48) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x46d sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602 #4 vn_lock+0x6e sys/kern/vfs_vnops.c:561 #5 spec_write+0xec sys/kern/spec_vnops.c:312 #6 VOP_WRITE+0xce sys/kern/vfs_vops.c:268 #7 vn_write+0x1be sys/kern/vfs_vnops.c:405 #8 dofilewritev+0x1ac sys/kern/sys_generic.c:364 #9 sys_write+0x83 sys/kern/sys_generic.c:284 #10 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #10 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #11 Xsyscall+0x128 panic: thread 0xffff800020b29650 cannot exit while holding sleeplocks Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 180308 78301 73 0x100010 0 0 syslogd *195807 44199 0 0x14000 0x200 1 reaper db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 witness_thread_exit(ffff800020b29650) at witness_thread_exit+0x213 sys/kern/subr_witness.c:1364 reaper(ffff800020aff8b8) at reaper+0x14c sys/kern/kern_exit.c:423 end trace frame: 0x0, count: 11 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 thread 0xffff800020b29650 cannot exit while holding sleeplocks ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic() at panic+0x15c sys/kern/subr_prf.c:207 witness_thread_exit(ffff800020b29650) at witness_thread_exit+0x213 sys/kern/subr_witness.c:1364 reaper(ffff800020aff8b8) at reaper+0x14c sys/kern/kern_exit.c:423 end trace frame: 0x0, count: -4 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020afd360 rbx 0xffff800020afd410 rdx 0xffff800020aff8b8 rcx 0 rax 0 r8 0xffffffff81247dd3 kprintf+0x173 r9 0x1 r10 0x25 r11 0xad53de68577d3d50 r12 0x3000000008 r13 0xffff800020afd370 r14 0x100 r15 0x1 rip 0xffffffff8177c6f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020afd350 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (reaper) pid=195807 stat=onproc flags process=14000 proc=200 pri=4, usrpri=52, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab18b0,0xffff800020aff3d8 process=0xffff800020aea708 user=0xffff800020af8000, vmspace=0xffffffff823aa0d0 estcpu=2, cpticks=6, pctcpu=0.50 user=0, sys=5, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 32262 414260 55566 32767 3 0x90 nanosleep syz-executor.1 55566 229522 42845 0 3 0x82 wait syz-executor.1 29052 441129 12144 32767 3 0x90 piperd syz-executor.0 12144 41000 42845 0 3 0x82 wait syz-executor.0 45352 16321 0 0 3 0x14200 bored sosplice 42845 295947 25570 0 3 0x82 thrsleep syz-fuzzer 42845 62348 25570 0 3 0x4000082 thrsleep syz-fuzzer 42845 443004 25570 0 3 0x4000082 thrsleep syz-fuzzer 42845 128707 25570 0 3 0x4000082 thrsleep syz-fuzzer 42845 262396 25570 0 3 0x4000082 thrsleep syz-fuzzer 42845 67306 25570 0 3 0x4000082 thrsleep syz-fuzzer 42845 290950 25570 0 3 0x4000082 thrsleep syz-fuzzer 42845 505627 25570 0 3 0x4000082 kqread syz-fuzzer 42845 211039 25570 0 3 0x4000082 thrsleep syz-fuzzer 42845 417665 25570 0 3 0x4000082 thrsleep syz-fuzzer 25570 347620 14180 0 3 0x10008a pause ksh 14180 219722 72880 0 3 0x92 select sshd 8979 186180 1 0 3 0x100083 ttyin getty 72880 176689 1 0 3 0x80 select sshd 78301 180308 50943 73 7 0x100010 syslogd 50943 136640 1 0 3 0x100082 netio syslogd 75888 24204 1 77 3 0x100090 poll dhclient 30814 512890 1 0 3 0x80 poll dhclient 87190 166619 0 0 3 0x14200 pgzero zerothread 7562 181572 0 0 3 0x14200 aiodoned aiodoned 5270 356323 0 0 3 0x14200 syncer update 22143 97720 0 0 3 0x14200 cleaner cleaner *44199 195807 0 0 7 0x14200 reaper 32461 132571 0 0 3 0x14200 pgdaemon pagedaemon 32760 475894 0 0 3 0x14200 bored crynlk 43258 286916 0 0 3 0x14200 bored crypto 46380 3401 0 0 3 0x40014200 acpi0 acpi0 46530 229991 0 0 3 0x40014200 idle1 14419 445781 0 0 3 0x14200 bored softnet 73798 217837 0 0 3 0x14200 bored systqmp 52947 287798 0 0 3 0x14200 bored systq 7103 340480 0 0 3 0x40014200 bored softclock 22666 133167 0 0 3 0x40014200 idle0 97521 166961 0 0 3 0x14200 bored smr 1 119855 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 78301 (syslogd) thread 0xffff800020b60778 (180308) exclusive rrwlock inode r = 0 (0xfffffd806ebc03c8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x46d sys/kern/kern_rwlock.c:306 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602 #4 vn_lock+0x6e sys/kern/vfs_vnops.c:561 #5 sys_fsync+0x114 sys/kern/vfs_syscalls.c:2806 #6 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #6 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #7 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9462 6321K 6321K 78643K 11804 0 0 pcb 13 8K 8K 78643K 13 0 0 rtable 105 3K 3K 78643K 11503 0 0 ifaddr 36 18K 21K 78643K 1571 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 571 0 0 iov 0 0K 32K 78643K 963 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1215 76K 76K 78643K 7439 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 5K 78643K 149 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 1400 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 7 21K 33K 78643K 13596 0 0 sigio 0 0K 0K 78643K 224 0 0 proc 41 38K 70K 78643K 11743 0 0 subproc 34 2K 2K 78643K 4301 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 0 0K 0K 78643K 1660 0 0 in_multi 33 2K 2K 78643K 3222 0 0 ether_multi 1 0K 0K 78643K 82 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 60 265K 265K 78643K 60 0 0 exec 0 0K 1K 78643K 4286 0 0 pagedep 1 8K 8K 78643K 1 0 0 inodedep 1 32K 32K 78643K 1 0 0 newblk 1 0K 0K 78643K 1 0 0 VM swap 7 26K 26K 78643K 7 0 0 UVM amap 103 21K 34K 78643K 46275 0 0 UVM aobj 130 4K 4K 78643K 144 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 0K 78643K 713 0 0 NDP 5 0K 0K 78643K 762 0 0 temp 121 2750K 2846K 78643K 60450 0 0 kqueue 0 0K 0K 78643K 181 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 517 0 511 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 1127 0 1125 1 0 1 1 0 8 0 rtentry 112 2815 0 2771 2 0 2 2 0 8 0 unpcb 120 4977 0 4969 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 4449 0 4449 1 1 0 1 0 8 0 tcpcb 544 3041 0 3037 1 0 1 1 0 8 0 ipq 40 15 0 15 9 8 1 1 0 8 1 ipqe 40 50 0 50 9 8 1 1 0 8 1 inpcb 280 7437 0 7426 25 23 2 2 0 8 1 nd6 48 759 0 753 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 11478 0 11281 26 13 13 13 0 8 0 art_table 32 11479 0 11281 2 0 2 2 0 8 0 art_node 16 2814 0 2774 1 0 1 1 0 8 0 sysvmsgpl 40 24 0 14 1 0 1 1 0 8 0 semapl 112 1398 0 1388 1 0 1 1 0 8 0 shmpl 112 142 0 14 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 15244 0 13785 49 1 48 48 0 8 0 ffsino 272 15244 0 13785 99 1 98 98 0 8 0 nchpl 144 31240 0 29611 61 0 61 61 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 200 5926 0 0 312 0 312 312 0 8 0 namei 1024 133003 0 133003 6 5 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 89090 0 89090 46 45 1 6 0 8 1 plimitpl 152 2267 0 2258 1 0 1 1 0 8 0 sigapl 432 13014 0 12999 17 15 2 3 0 8 0 futexpl 56 114222 0 114222 3 2 1 1 0 8 1 knotepl 112 7782 0 7763 1 0 1 1 0 8 0 kqueuepl 104 2923 0 2921 1 0 1 1 0 8 0 pipepl 112 8270 0 8251 16 15 1 2 0 8 0 fdescpl 488 13015 0 12999 3 0 3 3 0 8 0 filepl 152 78486 0 78388 27 22 5 7 0 8 0 lockfpl 104 2308 0 2308 21 20 1 1 0 8 1 lockfspl 48 751 0 751 21 20 1 1 0 8 1 sessionpl 112 268 0 258 1 0 1 1 0 8 0 pgrppl 48 420 0 410 1 0 1 1 0 8 0 ucredpl 96 21487 0 21478 1 0 1 1 0 8 0 zombiepl 144 13000 0 12999 4 3 1 1 0 8 0 processpl 896 13031 0 12999 4 0 4 4 0 8 0 procpl 632 35010 0 34968 50 45 5 5 0 8 1 srpgc 64 502 0 502 46 45 1 1 0 8 1 sosppl 128 265 0 265 49 49 0 1 0 8 0 sockpl 384 13790 0 13773 17 14 3 4 0 8 1 mcl64k 65536 25 0 0 4 1 3 3 0 8 0 mcl16k 16384 18 0 0 3 1 2 3 0 8 0 mcl12k 12288 65 0 0 3 1 2 2 0 8 0 mcl9k 9216 39 0 0 3 1 2 2 0 8 0 mcl8k 8192 32 0 0 4 2 2 3 0 8 0 mcl4k 4096 30 0 0 3 1 2 3 0 8 0 mcl2k2 2112 8 0 0 1 0 1 1 0 8 0 mcl2k 2048 222 0 0 20 10 10 20 0 8 0 mtagpl 80 2 0 0 1 0 1 1 0 8 0 mbufpl 256 901 0 0 12 0 12 12 0 8 0 bufpl 256 32488 0 25464 440 0 440 440 0 8 0 anonpl 16 1427982 0 1420779 216 172 44 48 0 125 3 amapchunkpl 152 109716 0 109626 181 176 5 18 0 158 0 amappl16 192 59063 0 58670 296 265 31 33 0 8 6 amappl15 184 1615 0 1612 1 0 1 1 0 8 0 amappl14 176 3448 0 3442 1 0 1 1 0 8 0 amappl13 168 2276 0 2274 29 28 1 1 0 8 0 amappl12 160 1263 0 1260 2 1 1 1 0 8 0 amappl11 152 1959 0 1948 1 0 1 1 0 8 0 amappl10 144 2245 0 2242 1 0 1 1 0 8 0 amappl9 136 4920 0 4914 1 0 1 1 0 8 0 amappl8 128 3749 0 3713 2 0 2 2 0 8 0 amappl7 120 2661 0 2650 1 0 1 1 0 8 0 amappl6 112 1440 0 1427 1 0 1 1 0 8 0 amappl5 104 3146 0 3136 1 0 1 1 0 8 0 amappl4 96 12697 0 12668 1 0 1 1 0 8 0 amappl3 88 3241 0 3231 1 0 1 1 0 8 0 amappl2 80 85202 0 85132 3 1 2 3 0 8 0 amappl1 72 360498 0 360050 23 13 10 19 0 8 0 amappl 80 39190 0 39153 1 0 1 1 0 84 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma64 64 259 0 259 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 17 0 17 1 1 0 1 0 8 0 aobjpl 64 143 0 14 3 0 3 3 0 8 0 uaddrrnd 24 13015 0 12999 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 13015 0 12999 1 0 1 1 0 8 0 vmmpekpl 168 108622 0 108595 2 0 2 2 0 8 0 vmmpepl 168 1676578 0 1674951 385 301 84 96 0 357 11 vmsppl 368 13014 0 12999 2 0 2 2 0 8 0 pdppl 4096 26037 0 25998 10 4 6 6 0 8 1 pvpl 32 3891721 0 3881286 609 489 120 127 0 265 15 pmappl 232 13014 0 12999 34 33 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 636 0 40 18 0 18 18 0 8 0