witness: thread 0xffff800020b28ef0 exiting with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd8069919f88) #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 0xffff800020b28ef0 cannot exit while holding sleeplocks Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 506351 81364 73 0x100010 0 0 syslogd *352402 13137 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(ffff800020b28ef0) at witness_thread_exit+0x213 sys/kern/subr_witness.c:1364 reaper(ffff800020aff640) 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 0xffff800020b28ef0 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(ffff800020b28ef0) at witness_thread_exit+0x213 sys/kern/subr_witness.c:1364 reaper(ffff800020aff640) at reaper+0x14c sys/kern/kern_exit.c:423 end trace frame: 0x0, count: -4 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020afdc90 rbx 0xffff800020afdd40 rdx 0xffff800020aff640 rcx 0 rax 0 r8 0xffffffff81b1c663 kprintf+0x173 r9 0x1 r10 0x25 r11 0xd6ba88f502a2132b r12 0x3000000008 r13 0xffff800020afdca0 r14 0x100 r15 0x1 rip 0xffffffff811a7028 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020afdc80 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (reaper) pid=352402 stat=onproc flags process=14000 proc=200 pri=4, usrpri=52, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab1b28,0xffff800020aff3d8 process=0xffff800020aea708 user=0xffff800020af8000, vmspace=0xffffffff823a7c40 estcpu=2, cpticks=6, pctcpu=0.34 user=0, sys=5, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 15363 78025 35738 32767 3 0x90 nanosleep syz-executor.1 35738 204352 24711 0 3 0x82 wait syz-executor.1 1185 186248 0 0 3 0x14200 bored sosplice 24711 170857 84936 0 3 0x82 thrsleep syz-fuzzer 24711 243538 84936 0 3 0x4000082 thrsleep syz-fuzzer 24711 148817 84936 0 3 0x4000082 thrsleep syz-fuzzer 24711 277040 84936 0 3 0x4000082 thrsleep syz-fuzzer 24711 211958 84936 0 3 0x4000082 thrsleep syz-fuzzer 24711 393898 84936 0 3 0x4000082 kqread syz-fuzzer 24711 120174 84936 0 3 0x4000082 thrsleep syz-fuzzer 24711 477414 84936 0 3 0x4000082 thrsleep syz-fuzzer 24711 19435 84936 0 3 0x4000082 thrsleep syz-fuzzer 24711 53110 84936 0 3 0x4000082 thrsleep syz-fuzzer 84936 82470 93901 0 3 0x10008a pause ksh 93901 314595 47931 0 3 0x92 select sshd 38402 273674 1 0 3 0x100083 ttyin getty 47931 389077 1 0 3 0x80 select sshd 81364 506351 28101 73 7 0x100010 syslogd 28101 138454 1 0 3 0x100082 netio syslogd 98159 362371 1 77 3 0x100090 poll dhclient 91979 381528 1 0 3 0x80 poll dhclient 73640 161750 0 0 3 0x14200 pgzero zerothread 91360 11872 0 0 3 0x14200 aiodoned aiodoned 98562 91835 0 0 3 0x14200 syncer update 77136 322128 0 0 3 0x14200 cleaner cleaner *13137 352402 0 0 7 0x14200 reaper 18511 346921 0 0 3 0x14200 pgdaemon pagedaemon 32929 386407 0 0 3 0x14200 bored crynlk 77594 135792 0 0 3 0x14200 bored crypto 65031 136805 0 0 3 0x40014200 acpi0 acpi0 8990 100467 0 0 3 0x40014200 idle1 31916 10833 0 0 3 0x14200 bored softnet 1981 404127 0 0 3 0x14200 bored systqmp 42511 10072 0 0 3 0x14200 bored systq 46584 234675 0 0 3 0x40014200 bored softclock 95108 245528 0 0 3 0x40014200 idle0 64862 316781 0 0 3 0x14200 bored smr 1 391571 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 81364 (syslogd) thread 0xffff800020b60ee0 (506351) exclusive rrwlock inode r = 0 (0xfffffd806eb974d8) #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 9459 6319K 6322K 78643K 10986 0 0 pcb 13 8K 8K 78643K 13 0 0 rtable 83 2K 3K 78643K 4107 0 0 ifaddr 29 10K 12K 78643K 565 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 246 0 0 iov 0 0K 28K 78643K 450 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1215 76K 76K 78643K 3538 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 56 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 589 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 4 9K 33K 78643K 5269 0 0 sigio 0 0K 0K 78643K 75 0 0 proc 41 38K 70K 78643K 4328 0 0 subproc 17 1K 2K 78643K 1513 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 617 0 0 in_multi 22 1K 2K 78643K 1143 0 0 ether_multi 1 0K 0K 78643K 29 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 1698 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 99 13K 31K 78643K 18360 0 0 UVM aobj 130 4K 4K 78643K 145 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 285 0 0 NDP 4 0K 0K 78643K 270 0 0 temp 97 2749K 2822K 78643K 24311 0 0 kqueue 0 0K 0K 78643K 111 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 64 181 0 177 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 419 0 417 1 0 1 1 0 8 0 rtentry 112 1003 0 970 2 0 2 2 0 8 0 unpcb 120 2000 0 1992 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 4798 0 4798 1 1 0 1 0 8 0 tcpcb 544 1202 0 1198 1 0 1 1 0 8 0 ipq 40 4 0 4 4 4 0 1 0 8 0 ipqe 40 12 0 12 4 4 0 1 0 8 0 inpcb 280 2861 0 2852 5 4 1 2 0 8 0 nd6 48 267 0 264 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 4078 0 3931 17 5 12 13 0 8 0 art_table 32 4079 0 3931 2 0 2 2 0 8 0 art_node 16 1002 0 972 1 0 1 1 0 8 0 sysvmsgpl 40 14 0 12 4 3 1 1 0 8 0 semapl 112 587 0 577 1 0 1 1 0 8 0 shmpl 112 143 0 15 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 7009 0 5578 47 0 47 47 0 8 0 ffsino 272 7009 0 5578 96 0 96 96 0 8 0 nchpl 144 13521 0 11900 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 54350 0 54350 3 2 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 39490 0 39490 25 24 1 6 0 8 1 plimitpl 152 895 0 888 1 0 1 1 0 8 0 sigapl 432 5179 0 5167 4 2 2 3 0 8 0 futexpl 56 48478 0 48478 2 1 1 1 0 8 1 knotepl 112 3000 0 2987 1 0 1 1 0 8 0 kqueuepl 104 1323 0 1321 1 0 1 1 0 8 0 pipepl 112 3596 0 3583 12 11 1 2 0 8 0 fdescpl 488 5180 0 5167 3 0 3 3 0 8 1 filepl 152 32544 0 32472 22 17 5 7 0 8 1 lockfpl 104 886 0 886 9 8 1 1 0 8 1 lockfspl 48 287 0 287 9 8 1 1 0 8 1 sessionpl 112 104 0 95 1 0 1 1 0 8 0 pgrppl 48 177 0 168 1 0 1 1 0 8 0 ucredpl 96 9337 0 9329 1 0 1 1 0 8 0 zombiepl 144 5167 0 5166 5 4 1 1 0 8 0 processpl 896 5196 0 5166 4 0 4 4 0 8 0 procpl 632 13908 0 13868 22 17 5 5 0 8 1 srpgc 64 176 0 176 17 16 1 1 0 8 1 sosppl 128 74 0 74 19 19 0 1 0 8 0 sockpl 384 5378 0 5361 9 6 3 4 0 8 1 mcl64k 65536 18 0 0 3 1 2 3 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 29 0 0 2 0 2 2 0 8 0 mcl9k 9216 11 0 0 1 0 1 1 0 8 0 mcl8k 8192 25 0 0 4 1 3 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 144 0 0 15 2 13 15 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 428 0 0 11 0 11 11 0 8 0 bufpl 256 15328 0 8304 440 0 440 440 0 8 0 anonpl 16 577192 0 571376 152 115 37 59 0 125 0 amapchunkpl 152 40864 0 40765 89 84 5 18 0 158 0 amappl16 192 23865 0 23504 194 173 21 41 0 8 1 amappl15 184 936 0 933 9 8 1 1 0 8 0 amappl14 176 1412 0 1406 1 0 1 1 0 8 0 amappl13 168 643 0 643 8 8 0 1 0 8 0 amappl12 160 482 0 480 1 0 1 1 0 8 0 amappl11 152 748 0 736 1 0 1 1 0 8 0 amappl10 144 935 0 933 1 0 1 1 0 8 0 amappl9 136 2245 0 2242 1 0 1 1 0 8 0 amappl8 128 1537 0 1500 3 1 2 2 0 8 0 amappl7 120 1031 0 1021 1 0 1 1 0 8 0 amappl6 112 544 0 535 1 0 1 1 0 8 0 amappl5 104 1171 0 1161 1 0 1 1 0 8 0 amappl4 96 4859 0 4833 1 0 1 1 0 8 0 amappl3 88 1860 0 1850 1 0 1 1 0 8 0 amappl2 80 34147 0 34082 3 1 2 3 0 8 0 amappl1 72 147649 0 147219 23 13 10 19 0 8 0 amappl 80 15576 0 15537 2 0 2 2 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 64 144 0 15 3 0 3 3 0 8 0 uaddrrnd 24 5180 0 5166 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5180 0 5166 1 0 1 1 0 8 0 vmmpekpl 168 47198 0 47170 2 0 2 2 0 8 0 vmmpepl 168 666593 0 665139 212 135 77 93 0 357 3 vmsppl 368 5179 0 5166 2 0 2 2 0 8 0 pdppl 4096 10368 0 10332 6 0 6 6 0 8 1 pvpl 32 1586432 0 1577416 355 253 102 149 0 265 8 pmappl 232 5179 0 5166 9 8 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 608 0 13 18 0 18 18 0 8 0