witness: thread 0xffff80003c420548 exiting with the following locks held: shared rwlock netlock r = 0 (0xffffffff837f6530) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 rw_do_enter_read+0x36e sys/kern/kern_rwlock.c:397 #2 sysctl_file+0x17e6 sys/kern/kern_sysctl.c:1769 #3 kern_sysctl+0x167 sys/kern/kern_sysctl.c:526 #4 sys_sysctl+0x3f2 sys/kern/kern_sysctl.c:-1 #5 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579 #6 Xsyscall+0x128 panic: thread 0xffff80003c420548 cannot exit while holding sleeplocks Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 128902 84881 73 0x1100010 0 0 syslogd * 14459 44802 0 0x14000 0x200 1 reaper db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8335036a) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_thread_exit(ffff80003c420548) at witness_thread_exit+0x426 sys/kern/subr_witness.c:1408 reaper(ffff8000ffffc7b8) at reaper+0x1ba sys/kern/kern_exit.c:492 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 *cpu1: thread 0xffff80003c420548 cannot exit while holding sleeplocks ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8335036a) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_thread_exit(ffff80003c420548) at witness_thread_exit+0x426 sys/kern/subr_witness.c:1408 reaper(ffff8000ffffc7b8) at reaper+0x1ba sys/kern/kern_exit.c:492 end trace frame: 0x0, count: -4 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002a2406d0 rbx 0xffff8000299dedd7 rdx 0 rcx 0xffff8000ffffc7b8 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x4337d0cf509831cd r11 0xb865faa8fed43080 r12 0xffff8000299debd8 r13 0 r14 0 r15 0x1 rip 0xffffffff810e70e5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80002a2406c0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (reaper) tid=14459 pid=44802 tcnt=1 stat=onproc flags process=14000 proc=200 runpri=4, usrpri=52, slppri=4, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000ffffd1f8,0xffff8000ffffc538 process=0xffff8000ffff7078 user=0xffff80002a23b000, vmspace=0xffffffff839706a0 estcpu=2, cpticks=5, pctcpu=0.4, user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 78567 471232 72404 0 3 0x80 nanoslp syz-executor 78567 336032 72404 0 3 0x4000080 ttyin syz-executor 5143 308586 98334 0 3 0x80 nanoslp syz-executor 5143 311004 98334 0 3 0x4000080 netcon syz-executor 5143 331828 98334 0 3 0x4000080 kqsel syz-executor 5143 352204 98334 0 3 0x4000080 fsleep syz-executor 87904 344141 38887 0 3 0x90 nanoslp syz-executor 87904 14121 38887 0 3 0x4000090 kqsel syz-executor 87904 51462 38887 0 3 0x4000090 fsleep syz-executor 63415 185726 25957 0 3 0x80 nanoslp syz-executor 63415 286349 25957 0 3 0x4000080 lockf syz-executor 63415 519454 25957 0 3 0x4000080 fsleep syz-executor 52355 7505 1 0 3 0x100083 ttyin getty 38887 146500 51251 0 3 0x82 nanoslp syz-executor 25957 297211 51251 0 3 0x82 nanoslp syz-executor 89324 81624 0 0 3 0x14200 acct acct 32423 198421 51251 0 3 0x82 piperd syz-executor 98334 435490 51251 0 3 0x82 nanoslp syz-executor 72404 100752 51251 0 3 0x82 nanoslp syz-executor 34577 286878 51251 0 3 0x82 piperd syz-executor 51835 127931 0 0 3 0x14200 bored sosplice 86801 521330 51251 0 3 0x82 nanoslp syz-executor 10096 82104 51251 0 3 0x82 nanoslp syz-executor 51251 496740 24417 0 3 0x2 netlock syz-executor 24417 488640 27954 0 3 0x10008a sigsusp ksh 27954 347671 67869 0 3 0x98 kqread sshd-session 67869 423866 8676 0 3 0x92 kqread sshd-session 8676 497388 1 0 3 0x88 kqread sshd 52298 387661 53002 74 3 0x1100092 bpf pflogd 53002 107177 1 0 3 0x80 sbwait pflogd 84881 128902 6135 73 7 0x1100010 syslogd 6135 376183 1 0 3 0x100082 sbwait syslogd 37324 497905 1 0 3 0x100080 kqread resolvd 4409 273953 98994 77 3 0x100092 kqread dhcpleased 15591 302217 98994 77 3 0x100092 kqread dhcpleased 98994 56541 1 0 3 0x80 kqread dhcpleased 5776 397903 0 0 3 0x14200 bored smr 44939 424489 0 0 3 0x14200 pgzero zerothread 85692 237974 0 0 3 0x14200 aiodoned aiodoned 41407 431699 0 0 3 0x14200 syncer update 5593 274163 0 0 3 0x14200 cleaner cleaner *44802 14459 0 0 7 0x14200 reaper 42609 246863 0 0 3 0x14200 pgdaemon pagedaemon 69185 11674 0 0 3 0x14200 bored viomb 73911 300208 0 0 3 0x40014200 acpi0 acpi0 14718 16299 0 0 3 0x40014200 idle1 57923 9999 0 0 3 0x14200 bored softnet3 61106 149120 0 0 3 0x14200 bored softnet2 61337 450275 0 0 3 0x14200 bored softnet1 3571 397790 0 0 3 0x14200 bored softnet0 84578 208047 0 0 3 0x14200 bored systqmp 80096 164139 0 0 3 0x14200 bored systq 2273 458299 0 0 3 0x14200 tmoslp softclockmp 9420 20981 0 0 3 0x40014200 netlock softclock 1965 200347 0 0 3 0x40014200 idle0 1 157717 0 0 3 0x82 wait init 0 0 -1 0 3 0x10010200 scheduler swapper ddb{1}> show all locks Process 51251 (syz-executor) thread 0xffff80002a2ba538 (496740) Process 84881 (syslogd) thread 0xffff8000ffff39b0 (128902) Process 9420 (softclock) thread 0xffff8000fffff1f0 (20981) ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10263 11188K 12490K 166960K 18828 0 pcb 19 17K 19K 166960K 770 0 rtable 230 12K 12K 166960K 1462 0 pf 39 18K 20K 166960K 389 0 ifaddr 42 8K 9K 166960K 288 0 ifgroup 63 2K 3K 166960K 539 0 sysctl 4 1K 9K 166960K 26 0 counters 72 37K 38K 166960K 502 0 ioctlops 0 0K 4K 166960K 2239 0 iov 0 0K 24K 166960K 267 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1483 93K 94K 166960K 5714 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 28K 36K 166960K 85 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 304 0 dirhash 15 2K 3K 166960K 102 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 16 57K 240K 166960K 4486 0 sigio 0 0K 0K 166960K 188 0 proc 73 91K 128K 166960K 1281 0 subproc 72 4K 4K 166960K 171 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 1 0K 0K 166960K 1086 0 in_multi 75 5K 7K 166960K 430 0 ether_multi 1 0K 0K 166960K 53 0 mrt 1 0K 0K 166960K 37 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 253 1129K 1129K 166960K 253 0 exec 0 0K 1K 166960K 1228 0 fusefs mount 1 32K 32K 166960K 1 0 pfkey data 0 0K 0K 166960K 5 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 263 174K 192K 166960K 41433 0 UVM aobj 114 7K 7K 166960K 127 0 pinsyscall 41 82K 103K 166960K 5843 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 290 0 NDP 14 0K 2K 166960K 203 0 temp 84 8696K 8952K 166960K 201458 0 kqueue 13 20K 32K 166960K 822 0 SYN cache 2 16K 16K 166960K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 438 0 434 3 2 1 2 0 8 0 rtentry 176 511 0 417 6 0 6 6 0 8 0 unpcb 144 2986 0 2969 24 22 2 6 0 8 1 syncache 336 5 0 5 2 2 0 1 0 8 0 tcpqe 32 2 0 2 1 1 0 1 0 8 0 tcpcb 808 1631 0 1624 41 33 8 8 0 8 7 arp 128 99 0 81 1 0 1 1 0 8 0 inpcb 328 5175 0 5155 37 30 7 12 0 8 5 nd6 144 91 0 66 2 0 2 2 0 8 0 pkpcb 40 122 0 122 5 4 1 1 0 8 1 kcovpl 48 19 0 11 1 0 1 1 0 8 0 mppekey 1024 3 0 3 3 2 1 1 0 8 1 ppxss 1192 147 0 147 1 0 1 1 0 8 1 pppxif 1504 37 0 37 5 4 1 1 0 8 1 pfstscr 40 1 0 1 1 1 0 1 0 8 0 pffrag 232 28 0 20 1 0 1 1 0 482 0 pffrnode 88 26 0 19 1 0 1 1 0 8 0 pffrent 40 57 0 48 1 0 1 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 291 0 185 1 0 1 1 0 8 0 pfstkey 128 292 0 186 4 0 4 4 0 8 0 pfstate 384 292 0 186 13 0 13 13 0 8 0 pfrule 1344 22 0 17 2 1 1 2 0 8 0 rttmr 136 10 0 10 8 7 1 1 0 8 1 art_heap8 4096 3 0 0 3 0 3 3 0 8 0 art_heap4 256 1799 0 1394 38 12 26 35 0 8 0 art_table 32 1802 0 1394 5 0 5 5 0 8 0 art_node 16 490 0 416 1 0 1 1 0 8 0 sysvmsgpl 40 18 0 12 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 301 0 291 1 0 1 1 0 8 0 shmpl 112 124 0 13 4 0 4 4 0 8 0 dirhash 1024 81 0 62 3 0 3 3 0 8 0 dino2pl 256 9827 0 8293 97 0 97 97 0 8 0 ffsino 288 9827 0 8293 111 0 111 111 0 8 0 nchpl 144 15948 0 14224 65 0 65 65 0 8 0 rtmask 32 13 0 13 6 5 1 1 0 8 1 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 216 5926 0 0 330 0 330 330 0 8 0 namei 1024 57453 0 57453 4 3 1 2 0 8 1 percpumem 16 266 0 215 1 0 1 1 0 8 0 kstatmem 264 322 0 288 3 0 3 3 0 8 0 acpiwqpl 32 2 0 2 1 0 1 1 1 8 1 scsiplug 72 28 0 28 7 6 1 1 0 8 1 scxspl 216 61355 0 61355 17 14 3 8 1 8 3 plimitpl 152 874 0 856 1 0 1 1 0 8 0 sigapl 424 4768 0 4718 9 0 9 9 0 8 1 knotepl 120 740 0 0 21 0 21 21 0 8 0 kqueuepl 224 1520 0 1507 13 12 1 5 0 8 0 pipepl 336 819 0 791 16 13 3 8 0 8 0 fdescpl 520 4717 0 4687 3 0 3 3 0 8 0 filepl 160 33997 0 33766 42 28 14 20 0 8 1 lockfpl 104 1754 0 1750 3 2 1 2 0 8 0 lockfspl 48 597 0 594 1 0 1 1 0 8 0 sessionpl 144 37 0 28 1 0 1 1 0 8 0 pgrppl 48 223 0 206 1 0 1 1 0 8 0 ucredpl 104 5917 0 5901 1 0 1 1 0 8 0 zombiepl 144 4720 0 4718 1 0 1 1 0 8 0 processpl 1240 4768 0 4718 6 0 6 6 0 8 0 procpl 656 11911 0 11848 9 1 8 8 0 8 0 srpgc 96 23 0 23 6 6 0 1 0 8 0 sosppl 168 20 0 20 8 8 0 1 0 8 0 sockpl 728 8874 0 8830 54 44 10 16 0 8 5 mcl64k 65536 15 0 0 2 0 2 2 0 8 0 mcl16k 16384 8 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 111 0 0 13 0 13 13 0 8 0 mcl2k 2048 74 0 0 7 0 7 7 0 8 0 mtagpl 96 217 0 0 5 0 5 5 0 8 0 mbufpl 256 562 0 0 32 0 32 32 0 8 0 bufpl 280 20262 0 14120 440 0 440 440 0 8 0 anonpl 32 12651 0 0 103 1 102 102 0 246 0 amapchunkpl 152 145058 0 144423 63 31 32 36 0 158 0 amappl16 200 11060 0 10952 71 53 18 24 0 8 8 amappl15 192 9 0 9 3 3 0 1 0 8 0 amappl14 184 141 0 129 1 0 1 1 0 8 0 amappl13 176 8 0 8 2 2 0 1 0 8 0 amappl12 168 5539 0 5509 4 2 2 3 0 8 0 amappl11 160 50 0 35 1 0 1 1 0 8 0 amappl10 152 47 0 47 1 1 0 1 0 8 0 amappl9 144 316 0 314 1 0 1 1 0 8 0 amappl8 136 44 0 41 1 0 1 1 0 8 0 amappl7 128 137 0 124 1 0 1 1 0 8 0 amappl6 120 311 0 307 1 0 1 1 0 8 0 amappl5 112 186 0 175 1 0 1 1 0 8 0 amappl4 104 373 0 352 1 0 1 1 0 8 0 amappl3 96 29909 0 29793 4 0 4 4 0 8 0 amappl2 88 824 0 758 2 0 2 2 0 8 0 amappl1 80 26970 0 26373 15 0 15 15 0 8 0 amappl 88 39758 0 39573 5 0 5 5 0 92 0 dma4096 4096 2 0 2 2 2 0 1 0 8 0 dma2048 2048 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 7 0 7 2 2 0 1 0 8 0 dma128 128 266 0 266 9 8 1 1 0 8 1 dma64 64 8 0 8 3 3 0 1 0 8 0 dma32 32 8 0 8 2 2 0 1 0 8 0 dma16 16 19 0 18 1 0 1 1 0 8 0 aobjpl 72 126 0 13 3 0 3 3 0 8 0 uaddrrnd 24 4717 0 4687 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4717 0 4687 1 0 1 1 0 8 0 vmmpekpl 168 32346 0 32284 3 0 3 3 0 8 0 vmmpepl 168 290107 0 288034 143 36 107 107 0 357 5 vmsppl 480 4716 0 4687 5 0 5 5 0 8 0 rwobjpl 72 73040 0 65958 140 5 135 135 0 8 1 pdppl 4096 9441 0 9374 145 74 71 85 0 8 4 pvpl 32 20748 0 0 167 1 166 166 0 265 0 pmappl 256 4716 0 4687 3 0 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 528 0 144 12 0 12 12 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp x86_ipi_db(ffffffff838b9ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff8391ffa0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:129 [inline] __mp_lock(ffffffff8391ffa0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:160 softintr_dispatch(0) at softintr_dispatch+0x12a sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:840 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff8391ffa0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:129 [inline] __mp_lock(ffffffff8391ffa0) at __mp_lock+0x192 sys/kern/kern_lock.c:160 __mp_acquire_count(ffffffff8391ffa0,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2da sys/kern/kern_synch.c:366 biowait(fffffd806ec6f008) at biowait+0xc1 sys/kern/vfs_bio.c:1245 bwrite(fffffd806ec6f008) at bwrite+0x2e5 sys/kern/vfs_bio.c:757 ffs_update(fffffd806e58f7f0,1) at ffs_update+0x34f sys/ufs/ffs/ffs_inode.c:111 end trace frame: 0xffff80002a2c8570, count: 0 ddb{0}> trace x86_ipi_db(ffffffff838b9ff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153 __mp_lock(ffffffff8391ffa0) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:129 [inline] __mp_lock(ffffffff8391ffa0) at __mp_lock+0x1a3 sys/kern/kern_lock.c:160 softintr_dispatch(0) at softintr_dispatch+0x12a sys/kern/kern_softintr.c:83 dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:840 Xsoftclock() at Xsoftclock+0x27 __mp_lock(ffffffff8391ffa0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:129 [inline] __mp_lock(ffffffff8391ffa0) at __mp_lock+0x192 sys/kern/kern_lock.c:160 __mp_acquire_count(ffffffff8391ffa0,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1 sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2da sys/kern/kern_synch.c:366 biowait(fffffd806ec6f008) at biowait+0xc1 sys/kern/vfs_bio.c:1245 bwrite(fffffd806ec6f008) at bwrite+0x2e5 sys/kern/vfs_bio.c:757 ffs_update(fffffd806e58f7f0,1) at ffs_update+0x34f sys/ufs/ffs/ffs_inode.c:111 VOP_FSYNC(fffffd806e590c20,fffffd80097fb9c0,1,ffff8000ffff39b0) at VOP_FSYNC+0x108 sys/kern/vfs_vops.c:311 sys_fsync(ffff8000ffff39b0,ffff80002a2c86b0,ffff80002a2c8600) at sys_fsync+0x16f sys/kern/vfs_syscalls.c:2936 syscall(ffff80002a2c86b0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff80002a2c86b0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f6a104bcab0, count: -18 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x25: addq $0x8,%rsp db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8335036a) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_thread_exit(ffff80003c420548) at witness_thread_exit+0x426 sys/kern/subr_witness.c:1408 reaper(ffff8000ffffc7b8) at reaper+0x1ba sys/kern/kern_exit.c:492 end trace frame: 0x0, count: 11 ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8335036a) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_thread_exit(ffff80003c420548) at witness_thread_exit+0x426 sys/kern/subr_witness.c:1408 reaper(ffff8000ffffc7b8) at reaper+0x1ba sys/kern/kern_exit.c:492 end trace frame: 0x0, count: -4