witness: userret: returning with the following locks held: shared rwlock netlock r = 0 (0xffffffff83801090) #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+0x1aef sys/kern/kern_sysctl.c:1771 #3 kern_sysctl+0x251 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: witness_warn Stopped at db_enter+0x25: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *326120 94032 32767 0x10 0x4000000 1 syz-executor 112960 93805 73 0x1100010 0 0 syslogd db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8338ac8d) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_warn(2,0,ffffffff83349b2f) at witness_warn+0x850 witness_debugger sys/kern/subr_witness.c:2576 [inline] witness_warn(2,0,ffffffff83349b2f) at witness_warn+0x850 sys/kern/subr_witness.c:1485 userret(ffff80003c4342c0) at userret+0x3a4 sys/kern/kern_sig.c:2227 syscall(ffff80003c46fdd0) at syscall+0x9c0 mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff80003c46fdd0) at syscall+0x9c0 sys/arch/amd64/amd64/trap.c:600 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xce75cc930b0, count: 9 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: witness_warn ddb{1}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438 panic(ffffffff8338ac8d) at panic+0x1e5 sys/kern/subr_prf.c:198 witness_warn(2,0,ffffffff83349b2f) at witness_warn+0x850 witness_debugger sys/kern/subr_witness.c:2576 [inline] witness_warn(2,0,ffffffff83349b2f) at witness_warn+0x850 sys/kern/subr_witness.c:1485 userret(ffff80003c4342c0) at userret+0x3a4 sys/kern/kern_sig.c:2227 syscall(ffff80003c46fdd0) at syscall+0x9c0 mi_syscall_return sys/sys/syscall_mi.h:203 [inline] syscall(ffff80003c46fdd0) at syscall+0x9c0 sys/arch/amd64/amd64/trap.c:600 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xce75cc930b0, count: -6 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80003c46fb00 rbx 0xffff8000299dedd7 rdx 0 rcx 0xffff80003c4342c0 rax 0xffff8000299ddff0 r8 0x101010101010101 r9 0x8080808080808080 r10 0x40c8ffa4e8862d95 r11 0x2b7bc3067d22cd3c r12 0xffff8000299debd8 r13 0 r14 0 r15 0x1 rip 0xffffffff828e9eb5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff80003c46faf0 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor) tid=326120 pid=94032 tcnt=4 stat=onproc flags process=10 proc=4000000 runpri=36, usrpri=86, slppri=36, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff80003c4459c8,0xffff80003c434040 process=0xffff80003b4126e0 user=0xffff80003c46a000, vmspace=0xfffffd806c4aa5c0 estcpu=36, cpticks=6, pctcpu=0.0, user=0, sys=6, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 9336 453427 95012 32767 2 0x10 syz-executor 9336 377485 95012 32767 2 0x4000010 syz-executor 13373 424666 42183 32767 2 0x10 syz-executor 13373 335900 42183 32767 2 0x4000090 syz-executor 87608 452283 25545 32767 2 0xc90 syz-executor 87608 280558 25545 32767 3 0x4000090 ttyout syz-executor 87608 383555 25545 32767 3 0x4000090 fsleep syz-executor 87608 503777 25545 32767 3 0x4000090 fsleep syz-executor 94032 203090 72758 32767 2 0x10 syz-executor *94032 326120 72758 32767 7 0x4000010 syz-executor 94032 78633 72758 32767 3 0x4000010 getblk syz-executor 94032 437543 72758 32767 3 0x4000090 fsleep syz-executor 91147 221022 0 0 3 0x14200 bored sosplice 21890 102960 51348 32767 2 0xc90 syz-executor 70325 368340 89110 32767 2 0x10 syz-executor 95012 92770 18434 32767 3 0x90 nanoslp syz-executor 25545 86660 64320 32767 3 0x90 nanoslp syz-executor 42183 340822 48050 32767 2 0xc90 syz-executor 72758 146834 89351 32767 2 0xc90 syz-executor 55495 358200 6507 32767 3 0x90 nanoslp syz-executor 36603 21891 48973 32767 3 0x90 nanoslp syz-executor 48050 512424 5184 0 3 0x82 wait syz-executor 89351 442583 5184 0 3 0x82 wait syz-executor 51348 252123 5184 0 3 0x82 wait syz-executor 48973 135804 5184 0 3 0x82 wait syz-executor 64320 73331 5184 0 3 0x82 wait syz-executor 6507 405330 5184 0 3 0x82 wait syz-executor 89110 104839 5184 0 3 0x82 wait syz-executor 18434 8577 5184 0 3 0x82 wait syz-executor 5184 157996 39724 0 3 0x82 kqread syz-executor 39724 155933 14527 0 3 0x10008a sigsusp ksh 14527 137759 7062 0 3 0x98 kqread sshd-session 7062 198136 95178 0 3 0x92 kqread sshd-session 57380 5353 1 0 3 0x100083 ttyin getty 95178 268840 1 0 3 0x88 kqread sshd 93805 112960 64035 73 7 0x1100010 syslogd 64035 285588 1 0 3 0x100082 sbwait syslogd 47893 247823 1 0 3 0x100080 kqread resolvd 27276 131268 23082 77 3 0x100092 kqread dhcpleased 94551 466583 23082 77 3 0x100092 kqread dhcpleased 23082 95631 1 0 3 0x80 kqread dhcpleased 89121 159746 0 0 3 0x14200 bored smr 36044 221765 0 0 2 0x14200 zerothread 2755 438867 0 0 3 0x14200 aiodoned aiodoned 93606 11211 0 0 3 0x14200 syncer update 17270 363633 0 0 3 0x14200 cleaner cleaner 44317 2671 0 0 3 0x14200 reaper reaper 51224 399195 0 0 3 0x14200 pgdaemon pagedaemon 23693 232229 0 0 3 0x14200 bored viomb 20394 25349 0 0 3 0x40014200 acpi0 acpi0 36804 126595 0 0 3 0x40014200 idle1 9349 58221 0 0 3 0x14200 bored softnet3 1893 241648 0 0 3 0x14200 bored softnet2 57349 425048 0 0 3 0x14200 bored softnet1 14567 441930 0 0 3 0x14200 bored softnet0 13616 396045 0 0 3 0x14200 bored systqmp 10237 415286 0 0 3 0x14200 bored systq 55038 94211 0 0 3 0x14200 netlock softclockmp 50783 397181 0 0 3 0x40014200 tmoslp softclock 48075 84127 0 0 3 0x40014200 idle0 1 30758 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 94032 (syz-executor) thread 0xffff80003c4342c0 (326120) shared rwlock netlock r = 0 (0xffffffff83801090) #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+0x1aef sys/kern/kern_sysctl.c:1771 #3 kern_sysctl+0x251 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 Process 94032 (syz-executor) thread 0xffff80003c434a70 (78633) exclusive rrwlock inode r = 0 (0xfffffd806bc63e60) #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_write+0x377 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1230 #6 ffs_inode_alloc+0x283 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_makeinode+0xcb sys/ufs/ufs/ufs_vnops.c:1732 #8 ufs_mknod+0x5b sys/ufs/ufs/ufs_vnops.c:167 #9 VOP_MKNOD+0x102 sys/kern/vfs_vops.c:121 #10 domknodat+0x47e sys/kern/vfs_syscalls.c:1636 #11 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #11 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #12 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806bc630e0) #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_write+0x377 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 domknodat+0xb4 sys/kern/vfs_syscalls.c:1588 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #9 Xsyscall+0x128 Process 70325 (syz-executor) thread 0xffff8000ffff07d0 (368340) exclusive rrwlock inode r = 0 (0xfffffd806bc63200) #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_write+0x377 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline] #4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159 #5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1230 #6 ffs_inode_alloc+0x283 sys/ufs/ffs/ffs_alloc.c:393 #7 ufs_mkdir+0x113 sys/ufs/ufs/ufs_vnops.c:1112 #8 VOP_MKDIR+0x102 sys/kern/vfs_vops.c:394 #9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3109 #10 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #10 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #11 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806c8088b0) #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_write+0x377 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418 #6 namei+0x7aa sys/kern/vfs_lookup.c:250 #7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3094 #8 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #8 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #9 Xsyscall+0x128 Process 93805 (syslogd) thread 0xffff8000ffff3c40 (112960) exclusive rrwlock inode r = 0 (0xfffffd806eb1dbe8) #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_write+0x377 sys/kern/kern_rwlock.c:310 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605 #3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 sys_fsync+0x152 sys/kern/vfs_syscalls.c:2936 #6 syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline] #6 syscall+0xb08 sys/arch/amd64/amd64/trap.c:579 #7 Xsyscall+0x128 Process 55038 (softclockmp) thread 0xffff8000ffffe7b0 (94211) shared rwlock timeout r = 0 (0xffffffff838c6218) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1160 #1 timeout_run+0x115 sys/kern/kern_timeout.c:690 #2 softclock_thread_run+0xec sys/kern/kern_timeout.c:838 #3 softclock_thread_mp+0x8f sys/kern/kern_timeout.c:873 #4 proc_trampoline+0x10 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10195 10956K 10966K 166960K 11272 0 pcb 17 12K 12K 166960K 17 0 rtable 240 6K 6K 166960K 359 0 pf 31 16K 16K 166960K 31 0 ifaddr 42 7K 7K 166960K 44 0 ifgroup 50 2K 2K 166960K 50 0 sysctl 2 1K 9K 166960K 7 0 counters 68 36K 36K 166960K 68 0 ioctlops 0 0K 2K 166960K 33 0 iov 0 0K 16K 166960K 8 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1334 84K 84K 166960K 1356 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 5K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 1K 166960K 16 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 25 93K 125K 166960K 273 0 sigio 0 0K 0K 166960K 3 0 proc 58 79K 103K 166960K 491 0 subproc 72 4K 4K 166960K 72 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 39 0 in_multi 99 7K 7K 166960K 108 0 ether_multi 1 0K 0K 166960K 3 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 345 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 272 174K 179K 166960K 4008 0 UVM aobj 10 5K 5K 166960K 10 0 pinsyscall 46 92K 112K 166960K 1275 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 9 0 NDP 11 0K 2K 166960K 27 0 temp 39 8683K 8747K 166960K 4196 0 kqueue 13 20K 24K 166960K 40 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 84 0 81 2 0 2 2 0 8 1 rtentry 176 114 0 1 6 0 6 6 0 8 0 unpcb 144 122 0 102 1 0 1 1 0 8 0 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpcb 808 63 0 59 1 0 1 1 0 8 0 arp 128 19 0 0 1 0 1 1 0 8 0 ipq 40 1 0 0 1 0 1 1 0 8 0 ipqe 40 1 0 0 1 0 1 1 0 8 0 inpcb 328 257 0 248 7 0 7 7 0 8 6 nd6 144 26 0 0 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 471 0 0 30 0 30 30 0 8 0 art_table 32 472 0 0 4 0 4 4 0 8 0 art_node 16 113 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 1 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 13 0 3 1 0 1 1 0 8 0 shmpl 112 7 0 0 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 1737 0 232 95 0 95 95 0 8 0 ffsino 288 1738 0 232 108 0 108 108 0 8 0 nchpl 144 2109 0 432 63 0 63 63 0 8 0 uvmvnodes 80 1819 0 0 38 0 38 38 0 8 0 vnodes 216 1819 0 0 102 0 102 102 0 8 0 namei 1024 6282 0 6280 2 0 2 2 0 8 1 percpumem 16 49 0 0 1 0 1 1 0 8 0 kstatmem 264 24 0 0 2 0 2 2 0 8 0 scxspl 216 6770 0 6770 3 2 1 2 1 8 1 plimitpl 152 152 0 126 2 0 2 2 0 8 1 sigapl 424 546 0 490 8 0 8 8 0 8 0 knotepl 120 368 0 0 12 0 12 12 0 8 0 kqueuepl 224 55 0 44 1 0 1 1 0 8 0 pipepl 336 108 0 81 3 0 3 3 0 8 0 fdescpl 520 527 0 490 4 0 4 4 0 8 0 filepl 160 2210 0 1980 12 0 12 12 0 8 2 lockfpl 104 36 0 34 1 0 1 1 0 8 0 lockfspl 48 16 0 14 1 0 1 1 0 8 0 sessionpl 144 23 0 7 1 0 1 1 0 8 0 pgrppl 48 32 0 8 1 0 1 1 0 8 0 ucredpl 104 231 0 212 1 0 1 1 0 8 0 zombiepl 144 493 0 490 1 0 1 1 0 8 0 processpl 1240 546 0 490 5 0 5 5 0 8 0 procpl 656 793 0 729 7 0 7 7 0 8 0 sosppl 168 1 0 1 1 0 1 1 0 8 1 sockpl 728 464 0 427 10 0 10 10 0 8 6 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 129 0 0 17 0 17 17 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 25 0 0 4 0 4 4 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 296 0 0 19 0 19 19 0 8 0 bufpl 280 2451 0 116 167 0 167 167 0 8 0 anonpl 32 5666 0 0 46 0 46 46 0 246 0 amapchunkpl 152 12133 0 11334 36 0 36 36 0 158 5 amappl16 200 1616 0 1578 5 1 4 5 0 8 0 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 120 0 110 1 0 1 1 0 8 0 amappl13 176 4 0 4 1 1 0 1 0 8 0 amappl12 168 1197 0 1160 2 0 2 2 0 8 0 amappl11 160 45 0 35 1 0 1 1 0 8 0 amappl10 152 3 0 3 1 1 0 1 0 8 0 amappl9 144 265 0 264 2 1 1 1 0 8 0 amappl8 136 31 0 30 1 0 1 1 0 8 0 amappl7 128 96 0 86 1 0 1 1 0 8 0 amappl6 120 165 0 162 1 0 1 1 0 8 0 amappl5 112 108 0 102 1 0 1 1 0 8 0 amappl4 104 278 0 261 1 0 1 1 0 8 0 amappl3 96 2084 0 1946 4 0 4 4 0 8 0 amappl2 88 603 0 549 2 0 2 2 0 8 0 amappl1 80 8681 0 8103 15 0 15 15 0 8 0 amappl 88 3363 0 3157 5 0 5 5 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 9 0 0 1 0 1 1 0 8 0 uaddrrnd 24 528 0 491 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 528 0 491 1 0 1 1 0 8 0 vmmpekpl 168 5960 0 5925 2 0 2 2 0 8 0 vmmpepl 168 39488 0 37331 101 0 101 101 0 357 2 vmsppl 480 527 0 491 7 1 6 6 0 8 0 rwobjpl 72 15028 0 12312 50 0 50 50 0 8 0 pdppl 4096 1063 0 982 109 24 85 97 0 8 4 pvpl 32 11996 0 0 97 0 97 97 0 265 0 pmappl 256 527 0 491 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 402 0 27 12 0 12 12 0 8 0 ddb{1}> machine ddbcpu 0