witness: thread 0xffff800020b28a00 exiting with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd807e58ae78) #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 190408 18299 73 0x100010 0 0 syslogd *477421 34969 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(ffff800020b28a00) 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 0xffff800020b28a00 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(ffff800020b28a00) 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 0xffff800020afd6b0 rbx 0xffff800020afd760 rdx 0xffff800020aff640 rcx 0 rax 0 r8 0xffffffff81ec29a3 kprintf+0x173 r9 0x1 r10 0x25 r11 0x917fa03be63c69dc r12 0x3000000008 r13 0xffff800020afd6c0 r14 0x100 r15 0x1 rip 0xffffffff81d956a8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020afd6a0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (reaper) pid=477421 stat=onproc flags process=14000 proc=200 pri=4, usrpri=55, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab1638,0xffff800020aff160 process=0xffff800020aea708 user=0xffff800020af8000, vmspace=0xffffffff8239d420 estcpu=5, cpticks=5, pctcpu=0.79 user=0, sys=5, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 64099 429090 78890 32767 3 0x3010 suspend syz-executor.1 64099 58445 78890 32767 3 0x4081010 inode syz-executor.1 4950 144560 69321 32767 3 0x90 piperd syz-executor.0 69321 295778 26922 0 3 0x82 wait syz-executor.0 78890 135489 5500 32767 3 0x90 nanosleep syz-executor.1 5500 190719 26922 0 3 0x82 wait syz-executor.1 30828 339453 0 0 3 0x14200 bored sosplice 26922 93334 42233 0 3 0x82 thrsleep syz-fuzzer 26922 365010 42233 0 3 0x4000082 thrsleep syz-fuzzer 26922 203931 42233 0 3 0x4000082 thrsleep syz-fuzzer 26922 355916 42233 0 3 0x4000082 kqread syz-fuzzer 26922 199653 42233 0 3 0x4000082 thrsleep syz-fuzzer 26922 45010 42233 0 3 0x4000082 thrsleep syz-fuzzer 26922 114922 42233 0 3 0x4000082 thrsleep syz-fuzzer 26922 35403 42233 0 3 0x4000082 thrsleep syz-fuzzer 26922 37211 42233 0 3 0x4000082 thrsleep syz-fuzzer 26922 141803 42233 0 3 0x4000082 thrsleep syz-fuzzer 42233 517093 11606 0 3 0x10008a pause ksh 11606 508893 59037 0 3 0x92 select sshd 3009 470969 1 0 3 0x100083 ttyin getty 59037 238398 1 0 3 0x80 select sshd 18299 190408 91838 73 7 0x100010 syslogd 91838 477885 1 0 3 0x100082 netio syslogd 18760 341015 1 77 3 0x100090 poll dhclient 21249 217264 1 0 3 0x80 poll dhclient 39821 250359 0 0 3 0x14200 pgzero zerothread 30396 407787 0 0 3 0x14200 aiodoned aiodoned 80543 380960 0 0 3 0x14200 syncer update 84136 59610 0 0 3 0x14200 cleaner cleaner *34969 477421 0 0 7 0x14200 reaper 43206 432709 0 0 3 0x14200 pgdaemon pagedaemon 91378 438747 0 0 3 0x14200 bored crynlk 60846 255392 0 0 3 0x14200 bored crypto 68369 342531 0 0 3 0x40014200 acpi0 acpi0 83301 136524 0 0 3 0x40014200 idle1 87280 499070 0 0 3 0x14200 bored softnet 47013 130860 0 0 3 0x14200 bored systqmp 92530 384769 0 0 3 0x14200 bored systq 93034 450862 0 0 3 0x40014200 bored softclock 18374 163893 0 0 3 0x40014200 idle0 10565 375116 0 0 3 0x14200 bored smr 1 501103 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 18299 (syslogd) thread 0xffff800020b60500 (190408) exclusive rrwlock inode r = 0 (0xfffffd806ebab3c8) #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 9463 6322K 6322K 78643K 11120 0 0 pcb 13 8K 8K 78643K 13 0 0 rtable 105 3K 3K 78643K 5336 0 0 ifaddr 35 11K 12K 78643K 734 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 298 0 0 iov 0 0K 28K 78643K 579 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1215 76K 76K 78643K 4194 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 77 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 616 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 7 21K 33K 78643K 6502 0 0 sigio 0 0K 0K 78643K 67 0 0 proc 41 38K 70K 78643K 5512 0 0 subproc 34 2K 2K 78643K 1972 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 740 0 0 in_multi 33 2K 2K 78643K 1456 0 0 ether_multi 1 0K 0K 78643K 40 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 66 291K 291K 78643K 66 0 0 exec 0 0K 1K 78643K 2051 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 110 21K 31K 78643K 22188 0 0 UVM aobj 130 4K 4K 78643K 155 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 358 0 0 NDP 5 0K 0K 78643K 351 0 0 temp 121 2750K 2822K 78643K 29918 0 0 kqueue 0 0K 0K 78643K 108 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 64 236 0 230 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 563 0 561 1 0 1 1 0 8 0 rtentry 112 1301 0 1257 2 0 2 2 0 8 0 unpcb 120 2633 0 2625 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 3878 0 3878 1 1 0 1 0 8 0 tcpcb 544 1371 0 1367 1 0 1 1 0 8 0 ipq 40 2 0 2 2 2 0 1 0 8 0 ipqe 40 4 0 4 2 2 0 1 0 8 0 inpcb 280 3496 0 3487 12 11 1 2 0 8 0 nd6 48 348 0 342 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 5301 0 5110 19 7 12 13 0 8 0 art_table 32 5302 0 5110 2 0 2 2 0 8 0 art_node 16 1300 0 1260 1 0 1 1 0 8 0 sysvmsgpl 40 36 0 23 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 614 0 604 1 0 1 1 0 8 0 shmpl 112 153 0 25 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 8139 0 6700 47 0 47 47 0 8 0 ffsino 272 8139 0 6700 99 2 97 97 0 8 0 nchpl 144 15890 0 14262 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 66527 0 66527 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 45995 0 45995 27 26 1 6 0 8 1 plimitpl 152 1118 0 1109 1 0 1 1 0 8 0 sigapl 432 6331 0 6316 5 3 2 3 0 8 0 futexpl 56 58922 0 58922 2 1 1 1 0 8 1 knotepl 112 3788 0 3769 1 0 1 1 0 8 0 kqueuepl 104 1458 0 1456 1 0 1 1 0 8 0 pipepl 112 4262 0 4243 13 12 1 2 0 8 0 fdescpl 488 6332 0 6316 3 0 3 3 0 8 0 filepl 152 39024 0 38918 22 17 5 7 0 8 0 lockfpl 104 1106 0 1106 8 7 1 1 0 8 1 lockfspl 48 362 0 362 8 7 1 1 0 8 1 sessionpl 112 131 0 121 1 0 1 1 0 8 0 pgrppl 48 188 0 178 1 0 1 1 0 8 0 ucredpl 96 11191 0 11182 1 0 1 1 0 8 0 zombiepl 144 6317 0 6316 3 2 1 1 0 8 0 processpl 896 6348 0 6316 4 0 4 4 0 8 0 procpl 632 16708 0 16665 21 16 5 5 0 8 1 srpgc 64 228 0 228 21 20 1 1 0 8 1 sosppl 128 139 0 139 22 22 0 1 0 8 0 sockpl 384 6827 0 6810 8 5 3 4 0 8 1 mcl64k 65536 11 0 0 2 0 2 2 0 8 0 mcl16k 16384 13 0 0 2 0 2 2 0 8 0 mcl12k 12288 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 25 0 0 2 0 2 2 0 8 0 mcl8k 8192 9 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 126 0 0 14 1 13 14 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 476 0 0 14 2 12 13 0 8 0 bufpl 256 15976 0 8952 440 0 440 440 0 8 0 anonpl 16 700518 0 694412 178 133 45 46 0 125 9 amapchunkpl 152 51947 0 51843 103 95 8 18 0 158 3 amappl16 192 28416 0 28031 173 144 29 32 0 8 8 amappl15 184 849 0 849 12 12 0 1 0 8 0 amappl14 176 1818 0 1809 1 0 1 1 0 8 0 amappl13 168 799 0 799 16 16 0 1 0 8 0 amappl12 160 954 0 949 1 0 1 1 0 8 0 amappl11 152 1057 0 1046 1 0 1 1 0 8 0 amappl10 144 893 0 890 2 1 1 1 0 8 0 amappl9 136 2689 0 2686 1 0 1 1 0 8 0 amappl8 128 2006 0 1973 2 0 2 2 0 8 0 amappl7 120 988 0 980 1 0 1 1 0 8 0 amappl6 112 788 0 778 1 0 1 1 0 8 0 amappl5 104 1795 0 1783 1 0 1 1 0 8 0 amappl4 96 6133 0 6103 2 1 1 2 0 8 0 amappl3 88 2174 0 2164 1 0 1 1 0 8 0 amappl2 80 41236 0 41170 4 2 2 3 0 8 0 amappl1 72 178658 0 178219 26 17 9 19 0 8 0 amappl 80 18722 0 18677 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 64 154 0 25 3 0 3 3 0 8 0 uaddrrnd 24 6332 0 6316 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 6332 0 6316 1 0 1 1 0 8 0 vmmpekpl 168 53943 0 53913 3 1 2 2 0 8 0 vmmpepl 168 814261 0 812664 232 148 84 92 0 357 9 vmsppl 368 6331 0 6316 2 0 2 2 0 8 0 pdppl 4096 12672 0 12632 6 0 6 6 0 8 0 pvpl 32 1918193 0 1908347 373 252 121 123 0 265 29 pmappl 232 6331 0 6316 9 8 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 612 0 15 18 0 18 18 0 8 0