witness: thread 0xffff800020a89b48 exiting with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd8067a7e3d8) #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 0xffff800020a89b48 cannot exit while holding sleeplocks Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 127121 94690 73 0x100010 0 0 syslogd *439479 13963 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(ffff800020a89b48) at witness_thread_exit+0x213 sys/kern/subr_witness.c:1364 reaper(ffff800020a5fb30) 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 0xffff800020a89b48 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(ffff800020a89b48) at witness_thread_exit+0x213 sys/kern/subr_witness.c:1364 reaper(ffff800020a5fb30) at reaper+0x14c sys/kern/kern_exit.c:423 end trace frame: 0x0, count: -4 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020a5dd20 rbx 0xffff800020a5ddd0 rdx 0xffff800020a5fb30 rcx 0 rax 0 r8 0xffffffff81346de3 kprintf+0x173 r9 0x1 r10 0x25 r11 0xed0c6c17163be643 r12 0x3000000008 r13 0xffff800020a5dd30 r14 0x100 r15 0x1 rip 0xffffffff81833028 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020a5dd10 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (reaper) pid=439479 stat=onproc flags process=14000 proc=200 pri=4, usrpri=53, nice=20 forw=0xffffffffffffffff, list=0xffff800020a11b28,0xffff800020a5f8c8 process=0xffff800020a4a388 user=0xffff800020a58000, vmspace=0xffffffff82640108 estcpu=3, cpticks=17, pctcpu=0.58 user=0, sys=6, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 65473 321538 91665 32767 3 0x90 piperd syz-executor.1 91665 321673 36399 0 3 0x82 wait syz-executor.1 26998 272963 73534 32767 2 0x490 syz-executor.0 73534 478537 36399 0 3 0x82 wait syz-executor.0 30806 338074 0 0 3 0x14200 bored sosplice 36399 322781 28544 0 3 0x82 thrsleep syz-fuzzer 36399 49019 28544 0 3 0x4000082 thrsleep syz-fuzzer 36399 309159 28544 0 3 0x4000082 thrsleep syz-fuzzer 36399 284127 28544 0 3 0x4000082 thrsleep syz-fuzzer 36399 212657 28544 0 3 0x4000082 thrsleep syz-fuzzer 36399 160689 28544 0 3 0x4000082 kqread syz-fuzzer 36399 328660 28544 0 3 0x4000082 thrsleep syz-fuzzer 36399 208119 28544 0 3 0x4000082 thrsleep syz-fuzzer 36399 497499 28544 0 3 0x4000082 thrsleep syz-fuzzer 36399 234929 28544 0 3 0x4000082 thrsleep syz-fuzzer 28544 419705 20240 0 3 0x10008a pause ksh 20240 230040 12890 0 3 0x92 select sshd 22967 483072 1 0 3 0x100083 ttyin getty 12890 481195 1 0 3 0x80 select sshd 94690 127121 52518 73 7 0x100010 syslogd 52518 390090 1 0 3 0x100082 netio syslogd 57006 329663 1 77 3 0x100090 poll dhclient 53447 244317 1 0 3 0x80 poll dhclient 59777 318983 0 0 3 0x14200 pgzero zerothread 49907 414877 0 0 3 0x14200 aiodoned aiodoned 48937 172043 0 0 3 0x14200 syncer update 23696 477087 0 0 3 0x14200 cleaner cleaner *13963 439479 0 0 7 0x14200 reaper 66400 402059 0 0 3 0x14200 pgdaemon pagedaemon 68291 198954 0 0 3 0x14200 bored crynlk 92480 480562 0 0 3 0x14200 bored crypto 69831 2972 0 0 3 0x40014200 acpi0 acpi0 63929 456785 0 0 3 0x40014200 idle1 77851 225051 0 0 3 0x14200 bored softnet 25583 43774 0 0 3 0x14200 bored systqmp 10728 281929 0 0 3 0x14200 bored systq 91228 505230 0 0 3 0x40014200 bored softclock 99355 427926 0 0 3 0x40014200 idle0 23785 418315 0 0 3 0x14200 bored smr 1 172226 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 94690 (syslogd) thread 0xffff800020ac0778 (127121) exclusive rrwlock inode r = 0 (0xfffffd806eb3c1a8) #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 9464 6322K 6322K 78643K 10731 0 0 pcb 13 8K 8K 78643K 13 0 0 rtable 105 3K 3K 78643K 1795 0 0 ifaddr 35 10K 10K 78643K 257 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 108 0 0 iov 0 0K 16K 78643K 127 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1215 76K 76K 78643K 2119 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 9K 78643K 39 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 224 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 6 17K 33K 78643K 1906 0 0 sigio 0 0K 0K 78643K 11 0 0 proc 41 38K 70K 78643K 1990 0 0 subproc 34 2K 2K 78643K 646 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 196 0 0 in_multi 33 2K 2K 78643K 471 0 0 ether_multi 1 0K 0K 78643K 13 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 72 318K 318K 78643K 72 0 0 exec 0 0K 1K 78643K 770 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 88 20K 29K 78643K 6980 0 0 UVM aobj 82 4K 4K 78643K 91 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 114 0 0 NDP 5 0K 0K 78643K 117 0 0 temp 121 3554K 3622K 78643K 11208 0 0 kqueue 0 0K 0K 78643K 22 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 78 0 72 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 162 0 160 1 0 1 1 0 8 0 rtentry 112 441 0 397 2 0 2 2 0 8 0 unpcb 120 653 0 645 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 3982 0 3982 1 1 0 1 0 8 0 tcpcb 544 410 0 406 1 0 1 1 0 8 0 inpcb 280 1040 0 1033 1 0 1 1 0 8 0 nd6 48 114 0 108 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1805 0 1614 13 1 12 13 0 8 0 art_table 32 1806 0 1614 2 0 2 2 0 8 0 art_node 16 440 0 400 1 0 1 1 0 8 0 sysvmsgpl 40 14 0 9 2 1 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 222 0 212 1 0 1 1 0 8 0 shmpl 112 89 0 9 3 0 3 3 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 3306 0 1879 47 0 47 47 0 8 0 ffsino 272 3306 0 1879 96 0 96 96 0 8 0 nchpl 144 5697 0 4072 61 0 61 61 0 8 0 uvmvnodes 72 3961 0 0 73 0 73 73 0 8 0 vnodes 200 3961 0 0 209 0 209 209 0 8 0 namei 1024 22295 0 22295 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 14989 0 14989 10 9 1 7 0 8 1 plimitpl 152 371 0 362 1 0 1 1 0 8 0 sigapl 432 1969 0 1955 4 2 2 3 0 8 0 futexpl 56 17918 0 17918 1 0 1 1 0 8 1 knotepl 112 1185 0 1166 1 0 1 1 0 8 0 kqueuepl 104 435 0 433 1 0 1 1 0 8 0 pipepl 112 1256 0 1237 3 2 1 2 0 8 0 fdescpl 488 1970 0 1955 3 0 3 3 0 8 1 filepl 152 12034 0 11938 8 3 5 6 0 8 1 lockfpl 104 310 0 310 6 5 1 1 0 8 1 lockfspl 48 94 0 94 6 5 1 1 0 8 1 sessionpl 112 53 0 43 1 0 1 1 0 8 0 pgrppl 48 81 0 71 1 0 1 1 0 8 0 ucredpl 96 3307 0 3298 1 0 1 1 0 8 0 zombiepl 144 1955 0 1954 2 1 1 1 0 8 0 processpl 896 1986 0 1954 4 0 4 4 0 8 0 procpl 632 4801 0 4758 11 6 5 5 0 8 1 srpgc 64 72 0 72 4 3 1 1 0 8 1 sosppl 128 34 0 34 7 7 0 1 0 8 0 sockpl 384 1886 0 1869 3 0 3 3 0 8 1 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 15 0 0 2 0 2 2 0 8 0 mcl9k 9216 5 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 16 0 0 2 0 2 2 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 109 0 0 13 0 13 13 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 247 0 0 12 0 12 12 0 8 0 bufpl 256 7736 0 1157 412 0 412 412 0 8 0 anonpl 16 205112 0 197915 85 50 35 46 0 124 2 amapchunkpl 152 15025 0 14925 31 26 5 14 0 158 1 amappl16 192 7506 0 7137 71 50 21 31 0 8 2 amappl15 184 549 0 547 2 1 1 1 0 8 0 amappl14 176 719 0 713 1 0 1 1 0 8 0 amappl13 168 202 0 200 5 4 1 1 0 8 0 amappl12 160 39 0 36 1 0 1 1 0 8 0 amappl11 152 393 0 381 1 0 1 1 0 8 0 amappl10 144 310 0 308 1 0 1 1 0 8 0 amappl9 136 1152 0 1149 1 0 1 1 0 8 0 amappl8 128 599 0 582 1 0 1 1 0 8 0 amappl7 120 356 0 348 1 0 1 1 0 8 0 amappl6 112 296 0 287 1 0 1 1 0 8 0 amappl5 104 411 0 401 1 0 1 1 0 8 0 amappl4 96 1940 0 1912 1 0 1 1 0 8 0 amappl3 88 971 0 956 1 0 1 1 0 8 0 amappl2 80 12361 0 12287 3 1 2 3 0 8 0 amappl1 72 60301 0 59854 23 13 10 19 0 8 0 amappl 80 5594 0 5554 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 90 0 9 2 0 2 2 0 8 0 uaddrrnd 24 1970 0 1954 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1970 0 1954 1 0 1 1 0 8 0 vmmpekpl 168 19588 0 19559 2 0 2 2 0 8 0 vmmpepl 168 253737 0 252172 133 57 76 84 0 357 6 vmsppl 368 1969 0 1954 2 0 2 2 0 8 0 pdppl 4096 3947 0 3908 6 0 6 6 0 8 1 pvpl 32 606328 0 595713 195 85 110 122 0 265 22 pmappl 232 1969 0 1954 5 4 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 568 0 4 17 0 17 17 0 8 0