witness: thread 0xffff800020b28a00 exiting with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd806ecd0c48) #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 0xffff800020b28a00 cannot exit while holding sleeplocks Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 505870 30472 73 0x100010 0 1K syslogd *186097 26835 0 0x14000 0x200 0 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(ffff800020b28a00) at witness_thread_exit+0x213 sys/kern/subr_witness.c:1364 reaper(ffff800020affb30) 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{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic thread 0xffff800020b28a00 cannot exit while holding sleeplocks ddb{0}> 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(ffff800020b28a00) at witness_thread_exit+0x213 sys/kern/subr_witness.c:1364 reaper(ffff800020affb30) at reaper+0x14c sys/kern/kern_exit.c:423 end trace frame: 0x0, count: -4 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020afd180 rbx 0xffff800020afd230 rdx 0xffff800020affb30 rcx 0 rax 0 r8 0xffffffff81c4d0a3 kprintf+0x173 r9 0x1 r10 0x25 r11 0x322009c1a486d313 r12 0x3000000008 r13 0xffff800020afd190 r14 0x100 r15 0x1 rip 0xffffffff81e02eb8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020afd170 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (reaper) pid=186097 stat=onproc flags process=14000 proc=200 pri=4, usrpri=52, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab18b0,0xffff800020aff8c8 process=0xffff800020aea008 user=0xffff800020af8000, vmspace=0xffffffff82394f78 estcpu=2, cpticks=7, pctcpu=0.42 user=0, sys=4, intr=1 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 18322 172168 76735 32767 2 0x10 syz-executor.0 18322 276153 76735 32767 2 0x4000010 syz-executor.0 76735 388190 61674 32767 3 0x90 nanosleep syz-executor.0 61674 358657 8081 0 3 0x82 wait syz-executor.0 78336 187054 53771 32767 3 0x90 nanosleep syz-executor.1 53771 316656 8081 0 3 0x82 wait syz-executor.1 13479 226277 0 0 3 0x14200 bored sosplice 8081 460125 84630 0 3 0x82 thrsleep syz-fuzzer 8081 83580 84630 0 3 0x4000082 thrsleep syz-fuzzer 8081 87578 84630 0 3 0x4000082 thrsleep syz-fuzzer 8081 371175 84630 0 3 0x4000082 kqread syz-fuzzer 8081 113832 84630 0 3 0x4000082 thrsleep syz-fuzzer 8081 361694 84630 0 3 0x4000082 thrsleep syz-fuzzer 8081 27721 84630 0 3 0x4000082 thrsleep syz-fuzzer 8081 419319 84630 0 3 0x4000082 thrsleep syz-fuzzer 8081 461630 84630 0 3 0x4000082 thrsleep syz-fuzzer 8081 111812 84630 0 3 0x4000082 thrsleep syz-fuzzer 84630 88852 43552 0 3 0x10008a pause ksh 43552 447294 5233 0 3 0x92 select sshd 20103 209811 1 0 2 0x100083 getty 5233 141082 1 0 3 0x80 select sshd 30472 505870 79936 73 7 0x100010 syslogd 79936 343550 1 0 3 0x100082 netio syslogd 53536 145529 1 77 3 0x100090 poll dhclient 83561 262696 1 0 3 0x80 poll dhclient 26348 437318 0 0 2 0x14200 zerothread 1968 352419 0 0 3 0x14200 aiodoned aiodoned 15347 246256 0 0 3 0x14200 syncer update 92982 361934 0 0 3 0x14200 cleaner cleaner *26835 186097 0 0 7 0x14200 reaper 21538 489615 0 0 3 0x14200 pgdaemon pagedaemon 71636 173495 0 0 3 0x14200 bored crynlk 52608 253503 0 0 3 0x14200 bored crypto 79031 460741 0 0 3 0x40014200 acpi0 acpi0 90013 193651 0 0 3 0x40014200 idle1 39667 187751 0 0 3 0x14200 bored softnet 67796 455189 0 0 3 0x14200 bored systqmp 21352 226459 0 0 3 0x14200 bored systq 23471 316046 0 0 3 0x40014200 bored softclock 22099 465664 0 0 3 0x40014200 idle0 95885 295289 0 0 3 0x14200 bored smr 1 3592 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 30472 (syslogd) thread 0xffff800020b61158 (505870) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82397de0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 #2 mi_switch+0x38f sys/kern/sched_bsd.c:441 #3 sleep_finish+0x113 sys/kern/kern_synch.c:373 #4 tsleep+0x198 sleep_finish_timeout sys/kern/kern_synch.c:397 [inline] #4 tsleep+0x198 sleep_finish_all sys/kern/kern_synch.c:183 [inline] #4 tsleep+0x198 sys/kern/kern_synch.c:152 #5 vwaitforio+0x9d sys/kern/vfs_subr.c:1869 #6 ffs_fsync+0x3c5 sys/ufs/ffs/ffs_vnops.c:495 #7 VOP_FSYNC+0xc7 sys/kern/vfs_vops.c:352 #8 sys_fsync+0x128 sys/kern/vfs_syscalls.c:2806 #9 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #9 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #10 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806ebaf5e8) #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{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9461 6321K 6321K 78643K 11048 0 0 pcb 13 8K 8K 78643K 13 0 0 rtable 105 3K 3K 78643K 4691 0 0 ifaddr 35 11K 12K 78643K 648 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 275 0 0 iov 0 0K 28K 78643K 516 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1215 76K 76K 78643K 3702 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 75 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 607 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 7 21K 33K 78643K 5732 0 0 sigio 0 0K 0K 78643K 110 0 0 proc 41 38K 70K 78643K 4879 0 0 subproc 34 2K 2K 78643K 1734 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 777 0 0 in_multi 33 2K 2K 78643K 1287 0 0 ether_multi 1 0K 0K 78643K 25 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 54 238K 238K 78643K 54 0 0 exec 0 0K 1K 78643K 1896 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 108 22K 31K 78643K 20008 0 0 UVM aobj 130 4K 4K 78643K 147 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 317 0 0 NDP 5 0K 0K 78643K 309 0 0 temp 121 2750K 2820K 78643K 26682 0 0 kqueue 0 0K 0K 78643K 84 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 208 0 202 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 478 0 476 1 0 1 1 0 8 0 rtentry 112 1147 0 1103 2 0 2 2 0 8 0 unpcb 120 2316 0 2308 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 3870 0 3870 1 1 0 1 0 8 0 tcpcb 544 1284 0 1280 1 0 1 1 0 8 0 inpcb 280 3156 0 3149 4 3 1 2 0 8 0 nd6 48 306 0 300 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 4675 0 4484 17 5 12 13 0 8 0 art_table 32 4676 0 4484 2 0 2 2 0 8 0 art_node 16 1146 0 1106 1 0 1 1 0 8 0 sysvmsgpl 40 25 0 9 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 605 0 595 1 0 1 1 0 8 0 shmpl 112 145 0 17 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 7290 0 5857 48 1 47 47 0 8 0 ffsino 272 7290 0 5857 96 0 96 96 0 8 0 nchpl 144 14518 0 12892 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 57162 0 57162 8 7 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 40804 0 40803 32 31 1 6 0 8 0 plimitpl 152 918 0 909 1 0 1 1 0 8 0 sigapl 432 5603 0 5588 5 3 2 3 0 8 0 futexpl 56 49891 0 49891 6 5 1 1 0 8 1 knotepl 112 3187 0 3168 1 0 1 1 0 8 0 kqueuepl 104 1290 0 1288 1 0 1 1 0 8 0 pipepl 112 4116 0 4097 19 17 2 2 0 8 1 fdescpl 488 5604 0 5588 7 4 3 3 0 8 1 filepl 152 33846 0 33750 29 23 6 7 0 8 2 lockfpl 104 914 0 914 17 16 1 1 0 8 1 lockfspl 48 297 0 297 17 16 1 1 0 8 1 sessionpl 112 117 0 107 1 0 1 1 0 8 0 pgrppl 48 172 0 162 1 0 1 1 0 8 0 ucredpl 96 8623 0 8614 1 0 1 1 0 8 0 zombiepl 144 5588 0 5587 2 1 1 1 0 8 0 processpl 896 5620 0 5587 4 0 4 4 0 8 0 procpl 632 14988 0 14944 25 20 5 5 0 8 1 srpgc 64 200 0 200 19 18 1 1 0 8 1 sosppl 128 105 0 105 25 24 1 1 0 8 1 sockpl 384 6044 0 6027 13 10 3 4 0 8 1 mcl64k 65536 9 0 0 2 0 2 2 0 8 0 mcl16k 16384 13 0 0 2 0 2 2 0 8 0 mcl12k 12288 41 0 0 2 0 2 2 0 8 0 mcl9k 9216 23 0 0 2 0 2 2 0 8 0 mcl8k 8192 11 0 0 2 0 2 2 0 8 0 mcl4k 4096 25 0 0 3 0 3 3 0 8 0 mcl2k2 2112 6 0 0 1 0 1 1 0 8 0 mcl2k 2048 127 0 0 13 2 11 13 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 487 0 0 11 0 11 11 0 8 0 bufpl 256 17988 0 10964 440 0 440 440 0 8 0 anonpl 16 617335 0 610235 127 85 42 47 0 125 0 amapchunkpl 152 44640 0 44537 77 71 6 18 0 158 1 amappl16 192 25821 0 25442 199 178 21 32 0 8 0 amappl15 184 695 0 693 14 13 1 1 0 8 0 amappl14 176 1438 0 1428 1 0 1 1 0 8 0 amappl13 168 541 0 539 12 11 1 1 0 8 0 amappl12 160 351 0 348 2 1 1 1 0 8 0 amappl11 152 1468 0 1457 1 0 1 1 0 8 0 amappl10 144 528 0 526 1 0 1 1 0 8 0 amappl9 136 2890 0 2883 1 0 1 1 0 8 0 amappl8 128 2137 0 2100 2 0 2 2 0 8 0 amappl7 120 672 0 662 1 0 1 1 0 8 0 amappl6 112 1209 0 1197 1 0 1 1 0 8 0 amappl5 104 1170 0 1160 1 0 1 1 0 8 0 amappl4 96 5672 0 5637 1 0 1 1 0 8 0 amappl3 88 1213 0 1203 1 0 1 1 0 8 0 amappl2 80 36675 0 36594 3 0 3 3 0 8 0 amappl1 72 160459 0 159997 23 13 10 19 0 8 0 amappl 80 16875 0 16833 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 64 146 0 17 3 0 3 3 0 8 0 uaddrrnd 24 5604 0 5587 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5604 0 5587 1 0 1 1 0 8 0 vmmpekpl 168 49788 0 49753 2 0 2 2 0 8 0 vmmpepl 168 724327 0 722609 259 180 79 94 0 357 4 vmsppl 368 5603 0 5587 2 0 2 2 0 8 0 pdppl 4096 11216 0 11174 10 4 6 6 0 8 0 pvpl 32 1671403 0 1660882 337 231 106 134 0 265 0 pmappl 232 5603 0 5587 12 11 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 613 0 20 17 0 17 17 0 8 0