login: witness: userret: returning with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd806944f708) #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_write+0x179 vn_lock sys/kern/vfs_vnops.c:561 [inline] #4 vn_write+0x179 sys/kern/vfs_vnops.c:401 #5 dofilewritev+0x1ac sys/kern/sys_generic.c:364 #6 sys_write+0x83 sys/kern/sys_generic.c:284 #7 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #7 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #8 Xsyscall+0x128 panic: witness_warn Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 80115 18947 0 0 0x4000000 1 syz-executor0 299896 62775 73 0x100010 0 0K syslogd 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_warn(2,0,ffffffff82208600) at witness_warn+0x69e witness_debugger sys/kern/subr_witness.c:2509 [inline] witness_warn(2,0,ffffffff82208600) at witness_warn+0x69e sys/kern/subr_witness.c:1454 userret(ffff800020ab0c78) at userret+0x36a sys/kern/kern_sig.c:1916 syscall(ffff800020b9dab0) at syscall+0x44a mi_syscall_return sys/sys/syscall_mi.h:115 [inline] syscall(ffff800020b9dab0) at syscall+0x44a sys/arch/amd64/amd64/trap.c:577 Xsyscall(6,5,c,0,3,7bcb641f0d8) at Xsyscall+0x128 end of kernel end trace frame: 0x7bf83ff0720, 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 witness_warn 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_warn(2,0,ffffffff82208600) at witness_warn+0x69e witness_debugger sys/kern/subr_witness.c:2509 [inline] witness_warn(2,0,ffffffff82208600) at witness_warn+0x69e sys/kern/subr_witness.c:1454 userret(ffff800020ab0c78) at userret+0x36a sys/kern/kern_sig.c:1916 syscall(ffff800020b9dab0) at syscall+0x44a mi_syscall_return sys/sys/syscall_mi.h:115 [inline] syscall(ffff800020b9dab0) at syscall+0x44a sys/arch/amd64/amd64/trap.c:577 Xsyscall(6,5,c,0,3,7bcb641f0d8) at Xsyscall+0x128 end of kernel end trace frame: 0x7bf83ff0720, count: -6 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020b9d7f0 rbx 0xffff800020b9d8a0 rdx 0xffff800020ab0c78 rcx 0 rax 0 r8 0xffffffff81419ea3 kprintf+0x173 r9 0x1 r10 0x25 r11 0xde79626c8c0721ef r12 0x3000000008 r13 0xffff800020b9d800 r14 0x100 r15 0x1 rip 0xffffffff8131c258 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020b9d7e0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor0) pid=80115 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab1658,0xffff800020ab13f0 process=0xffff800020add500 user=0xffff800020b98000, vmspace=0xfffffd806e792008 estcpu=36, cpticks=4, pctcpu=0.0 user=0, sys=4, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 2013 379530 60502 0 2 0 syz-executor1 2013 428993 60502 0 3 0x4000000 inode syz-executor1 2013 491568 60502 0 3 0x4000000 fdlock syz-executor1 18947 285148 63561 0 2 0 syz-executor0 18947 167120 63561 0 3 0x4000080 fsleep syz-executor0 *18947 80115 63561 0 7 0x4000000 syz-executor0 18947 22450 63561 0 2 0x4000000 syz-executor0 60502 276705 30528 0 2 0x482 syz-executor1 63561 214348 30528 0 2 0x482 syz-executor0 30528 207844 10752 0 3 0x82 thrsleep syz-execprog 30528 522672 10752 0 3 0x4000082 thrsleep syz-execprog 30528 44794 10752 0 3 0x4000082 thrsleep syz-execprog 30528 75166 10752 0 3 0x4000082 thrsleep syz-execprog 30528 212739 10752 0 3 0x4000082 thrsleep syz-execprog 30528 519189 10752 0 3 0x4000082 thrsleep syz-execprog 30528 330248 10752 0 3 0x4000082 thrsleep syz-execprog 30528 125884 10752 0 3 0x4000082 thrsleep syz-execprog 30528 101037 10752 0 3 0x4000082 kqread syz-execprog 30528 42905 10752 0 3 0x4000082 thrsleep syz-execprog 10752 82775 3903 0 3 0x10008a pause ksh 3903 34556 86945 0 3 0x92 select sshd 61788 199541 1 0 3 0x100083 ttyin getty 86945 195944 1 0 3 0x80 select sshd 43925 522324 49301 74 3 0x100092 bpf pflogd 49301 141094 1 0 3 0x80 netio pflogd 62775 299896 71049 73 7 0x100010 syslogd 71049 161457 1 0 3 0x100082 netio syslogd 60772 244397 1 77 3 0x100090 poll dhclient 75688 75097 1 0 3 0x80 poll dhclient 45998 76790 0 0 3 0x14200 pgzero zerothread 67986 339506 0 0 3 0x14200 aiodoned aiodoned 87731 468024 0 0 3 0x14200 syncer update 22190 7179 0 0 3 0x14200 cleaner cleaner 56326 485463 0 0 3 0x14200 reaper reaper 37333 92293 0 0 3 0x14200 pgdaemon pagedaemon 43142 159405 0 0 3 0x14200 bored crynlk 5671 370911 0 0 3 0x14200 bored crypto 26260 119428 0 0 3 0x40014200 acpi0 acpi0 94438 239520 0 0 3 0x40014200 idle1 68651 26846 0 0 3 0x14200 bored softnet 73455 294796 0 0 3 0x14200 bored systqmp 95702 363389 0 0 3 0x14200 bored systq 75275 99696 0 0 3 0x40014200 bored softclock 95968 112087 0 0 3 0x40014200 idle0 46729 72175 0 0 3 0x14200 bored smr 1 150433 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 2013 (syz-executor1) thread 0xffff800020ab1658 (428993) exclusive rrwlock inode r = 0 (0xfffffd807ec56d58) #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+0x6c sys/kern/vfs_vnops.c:561 #5 vget+0x1c3 sys/kern/vfs_subr.c:672 #6 cache_lookup+0x2cf sys/kern/vfs_cache.c:224 #7 ufs_lookup+0x1ad sys/ufs/ufs/ufs_lookup.c:162 #8 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:90 #9 vfs_lookup+0x7a5 sys/kern/vfs_lookup.c:567 #10 namei+0x61c sys/kern/vfs_lookup.c:248 #11 ptmioctl+0x3af sys/kern/tty_pty.c:1121 #12 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 #13 vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 #14 sys_ioctl+0x5b8 #15 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #15 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #16 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xfffffd807df6c068) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 ptmioctl+0xe7 sys/kern/tty_pty.c:1071 #2 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 #3 vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 #4 sys_ioctl+0x5b8 #5 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #5 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #6 Xsyscall+0x128 Process 18947 (syz-executor0) thread 0xffff800020ab0c78 (80115) exclusive rrwlock inode r = 0 (0xfffffd806944f708) #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_write+0x179 vn_lock sys/kern/vfs_vnops.c:561 [inline] #4 vn_write+0x179 sys/kern/vfs_vnops.c:401 #5 dofilewritev+0x1ac sys/kern/sys_generic.c:364 #6 sys_write+0x83 sys/kern/sys_generic.c:284 #7 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #7 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #8 Xsyscall+0x128 Process 62775 (syslogd) thread 0xffff800020ac1158 (299896) exclusive rrwlock inode r = 0 (0xfffffd807e2dac48) #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+0x6c 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 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82618c78) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 syscall+0x412 mi_syscall sys/sys/syscall_mi.h:83 [inline] #1 syscall+0x412 sys/arch/amd64/amd64/trap.c:555 #2 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9469 6388K 6388K 78643K 10556 0 0 pcb 13 8K 8K 78643K 13 0 0 rtable 97 3K 3K 78643K 177 0 0 ifaddr 38 10K 10K 78643K 39 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1469 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1198 75K 75K 78643K 39808 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 1K 78643K 2 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 2 0K 0K 78643K 2 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 5 16K 20K 78643K 17603 0 0 proc 52 50K 71K 78643K 374 0 0 subproc 0 0K 1K 78643K 17 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 in_multi 33 2K 2K 78643K 33 0 0 ether_multi 1 0K 0K 78643K 1 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 60 265K 265K 78643K 60 0 0 exec 0 0K 1K 78643K 212 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 87 20K 20K 78643K 53771 0 0 UVM aobj 2 2K 2K 78643K 2 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 NDP 6 0K 0K 78643K 10 0 0 temp 55 3526K 3590K 78643K 38485 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 4 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 15 0 13 1 0 1 1 0 8 0 rtentry 112 41 0 1 2 0 2 2 0 8 0 unpcb 120 41 0 31 1 0 1 1 0 8 0 syncache 264 8 0 8 1 1 0 1 0 8 0 tcpcb 544 14 0 11 1 0 1 1 0 8 0 inpcb 280 39 0 33 1 0 1 1 0 8 0 nd6 48 4 0 0 1 0 1 1 0 8 0 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 16 0 15 1 0 1 1 0 8 0 pfstkey 112 16 0 15 1 0 1 1 0 8 0 pfstate 328 16 0 15 2 1 1 2 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 185 0 0 12 0 12 12 0 8 0 art_table 32 186 0 0 2 0 2 2 0 8 0 art_node 16 40 0 6 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 57643 0 56214 47 0 47 47 0 8 0 ffsino 272 57643 0 56214 96 0 96 96 0 8 0 nchpl 144 75487 0 73848 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 446686 0 446685 1 0 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 144620 0 144619 8 7 1 7 0 8 0 plimitpl 152 20 0 12 1 0 1 1 0 8 0 sigapl 432 17823 0 17807 2 0 2 2 0 8 0 futexpl 56 156212 0 156211 2 1 1 1 0 8 0 knotepl 112 95 0 78 1 0 1 1 0 8 0 kqueuepl 104 3 0 1 1 0 1 1 0 8 0 pipepl 112 218 0 199 1 0 1 1 0 8 0 fdescpl 488 17824 0 17807 3 0 3 3 0 8 0 filepl 152 298445 0 298363 5 1 4 4 0 8 0 lockfpl 104 6 0 6 1 1 0 1 0 8 0 lockfspl 48 3 0 3 1 1 0 1 0 8 0 sessionpl 112 27 0 16 1 0 1 1 0 8 0 pgrppl 48 27 0 16 1 0 1 1 0 8 0 ucredpl 96 274976 0 274967 1 0 1 1 0 8 0 zombiepl 144 17807 0 17807 1 0 1 1 0 8 1 processpl 896 17839 0 17807 4 0 4 4 0 8 0 procpl 632 52968 0 52922 5 1 4 4 0 8 0 sockpl 384 95 0 77 3 1 2 3 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 89 0 0 11 0 11 11 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 113 0 0 7 0 7 7 0 8 0 bufpl 256 23594 0 16574 439 0 439 439 0 8 0 anonpl 16 973703 0 970998 17 6 11 13 0 124 0 amapchunkpl 152 88654 0 88556 7 3 4 5 0 158 0 amappl16 192 73778 0 73676 7 1 6 6 0 8 0 amappl15 184 2 0 1 2 1 1 1 0 8 0 amappl14 176 8827 0 8816 1 0 1 1 0 8 0 amappl13 168 12 0 12 2 2 0 1 0 8 0 amappl12 160 10 0 9 2 1 1 1 0 8 0 amappl11 152 59 0 44 1 0 1 1 0 8 0 amappl10 144 93 0 91 1 0 1 1 0 8 0 amappl9 136 9633 0 9628 1 0 1 1 0 8 0 amappl8 128 8993 0 8979 1 0 1 1 0 8 0 amappl7 120 41 0 38 1 0 1 1 0 8 0 amappl6 112 82 0 75 1 0 1 1 0 8 0 amappl5 104 180 0 166 1 0 1 1 0 8 0 amappl4 96 18180 0 18151 3 2 1 2 0 8 0 amappl3 88 233 0 222 1 0 1 1 0 8 0 amappl2 80 141759 0 141680 4 2 2 3 0 8 0 amappl1 72 416823 0 416351 30 20 10 20 0 8 0 amappl 80 53194 0 53155 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 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 17824 0 17807 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 17824 0 17807 1 0 1 1 0 8 0 vmmpekpl 168 130135 0 130110 2 0 2 2 0 8 0 vmmpepl 168 1499646 0 1498450 98 46 52 78 0 357 0 vmsppl 368 17823 0 17807 2 0 2 2 0 8 0 pdppl 4096 35655 0 35614 7 1 6 6 0 8 0 pvpl 32 2705102 0 2699710 110 66 44 107 0 265 0 pmappl 232 17823 0 17807 2 1 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 585 0 4 17 0 17 17 0 8 0