witness: userret: returning with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd80691f2918) #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+0x169 vn_lock sys/kern/vfs_vnops.c:561 [inline] #4 vn_write+0x169 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 *506587 36092 32767 0x1010 0x4080000 1 syz-executor.0 433217 62296 73 0x100010 0 0 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,ffffffff82206cf8) at witness_warn+0x69e witness_debugger sys/kern/subr_witness.c:2509 [inline] witness_warn(2,0,ffffffff82206cf8) at witness_warn+0x69e sys/kern/subr_witness.c:1454 userret(ffff800020ab1650) at userret+0x36a sys/kern/kern_sig.c:1916 syscall(ffff800024fbf620) at syscall+0x44a mi_syscall_return sys/sys/syscall_mi.h:115 [inline] syscall(ffff800024fbf620) at syscall+0x44a sys/arch/amd64/amd64/trap.c:577 Xsyscall(6,5,c,0,3,340948460e0) at Xsyscall+0x128 end of kernel end trace frame: 0x3438718fd60, 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,ffffffff82206cf8) at witness_warn+0x69e witness_debugger sys/kern/subr_witness.c:2509 [inline] witness_warn(2,0,ffffffff82206cf8) at witness_warn+0x69e sys/kern/subr_witness.c:1454 userret(ffff800020ab1650) at userret+0x36a sys/kern/kern_sig.c:1916 syscall(ffff800024fbf620) at syscall+0x44a mi_syscall_return sys/sys/syscall_mi.h:115 [inline] syscall(ffff800024fbf620) at syscall+0x44a sys/arch/amd64/amd64/trap.c:577 Xsyscall(6,5,c,0,3,340948460e0) at Xsyscall+0x128 end of kernel end trace frame: 0x3438718fd60, count: -6 ddb{1}> show registers rdi 0 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800024fbf360 rbx 0xffff800024fbf410 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800022f40000 rax 0xffff800000a6f600 r8 0xffffffff819c31d3 kprintf+0x173 r9 0x1 r10 0x25 r11 0x5054b04ed87485bb r12 0x3000000008 r13 0xffff800024fbf370 r14 0x100 r15 0x1 rip 0xffffffff817a35f8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024fbf350 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=506587 stat=onproc flags process=1010 proc=4080000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab1b40,0xffffffff82670120 process=0xffff800020a8b510 user=0xffff800024fba000, vmspace=0xfffffd807f00b730 estcpu=36, cpticks=4, pctcpu=0.0 user=0, sys=3, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 36092 37593 90605 32767 3 0x3010 suspend syz-executor.0 *36092 506587 90605 32767 7 0x4081010 syz-executor.0 90605 201034 18955 32767 3 0x90 nanosleep syz-executor.0 18955 266394 59721 0 3 0x82 wait syz-executor.0 10734 387260 89108 32767 3 0x90 nanosleep syz-executor.1 89108 132286 59721 0 3 0x82 wait syz-executor.1 7735 430350 0 0 3 0x14200 bored sosplice 59721 150543 96644 0 3 0x82 thrsleep syz-fuzzer 59721 429963 96644 0 3 0x4000082 thrsleep syz-fuzzer 59721 376582 96644 0 3 0x4000082 thrsleep syz-fuzzer 59721 21503 96644 0 3 0x4000082 thrsleep syz-fuzzer 59721 408624 96644 0 3 0x4000082 thrsleep syz-fuzzer 59721 178662 96644 0 3 0x4000082 kqread syz-fuzzer 59721 152123 96644 0 3 0x4000082 thrsleep syz-fuzzer 59721 515644 96644 0 3 0x4000082 thrsleep syz-fuzzer 59721 108912 96644 0 3 0x4000082 thrsleep syz-fuzzer 59721 263984 96644 0 3 0x4000082 thrsleep syz-fuzzer 96644 311338 35244 0 3 0x10008a pause ksh 35244 156018 4830 0 3 0x92 select sshd 16934 115510 1 0 3 0x100083 ttyin getty 4830 485672 1 0 3 0x80 select sshd 62296 433217 13980 73 7 0x100010 syslogd 13980 288479 1 0 3 0x100082 netio syslogd 3255 61599 1 77 3 0x100090 poll dhclient 18570 369605 1 0 3 0x80 poll dhclient 68024 504466 0 0 3 0x14200 pgzero zerothread 60974 135053 0 0 3 0x14200 aiodoned aiodoned 49878 99499 0 0 3 0x14200 syncer update 81312 490486 0 0 3 0x14200 cleaner cleaner 65012 140741 0 0 3 0x14200 reaper reaper 40133 226256 0 0 3 0x14200 pgdaemon pagedaemon 28479 29900 0 0 3 0x14200 bored crynlk 60141 376674 0 0 3 0x14200 bored crypto 77871 455145 0 0 3 0x40014200 acpi0 acpi0 76231 440863 0 0 3 0x40014200 idle1 96492 434874 0 0 3 0x14200 bored softnet 73861 166621 0 0 3 0x14200 bored systqmp 37199 209193 0 0 3 0x14200 bored systq 27775 387811 0 0 3 0x40014200 bored softclock 6999 12634 0 0 3 0x40014200 idle0 49077 23756 0 0 3 0x14200 bored smr 1 162188 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 36092 (syz-executor.0) thread 0xffff800020ab1650 (506587) exclusive rrwlock inode r = 0 (0xfffffd80691f2918) #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+0x169 vn_lock sys/kern/vfs_vnops.c:561 [inline] #4 vn_write+0x169 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 62296 (syslogd) thread 0xffff800020ac0500 (433217) exclusive rrwlock inode r = 0 (0xfffffd806eca03c8) #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 11650 0 0 pcb 13 8K 8K 78643K 13 0 0 rtable 105 3K 3K 78643K 10055 0 0 ifaddr 36 14K 15K 78643K 1392 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 490 0 0 iov 0 0K 32K 78643K 747 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1215 76K 76K 78643K 6569 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 78 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 1049 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 8 25K 33K 78643K 11466 0 0 sigio 0 0K 0K 78643K 130 0 0 proc 41 38K 70K 78643K 10249 0 0 subproc 34 2K 2K 78643K 3774 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 1010 0 0 in_multi 33 2K 2K 78643K 2681 0 0 ether_multi 1 0K 0K 78643K 42 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 3649 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 142 23K 32K 78643K 36047 0 0 UVM aobj 130 4K 4K 78643K 136 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 1026 0 0 NDP 5 0K 0K 78643K 669 0 0 temp 121 3542K 3614K 78643K 52039 0 0 kqueue 0 0K 0K 78643K 122 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 64 448 0 442 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 926 0 924 1 0 1 1 0 8 0 rtentry 112 2467 0 2423 2 0 2 2 0 8 0 unpcb 120 3728 0 3720 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 170 0 170 16 16 0 1 0 8 0 tcpcb 544 2248 0 2244 1 0 1 1 0 8 0 ipq 40 4 0 4 3 3 0 1 0 8 0 ipqe 40 10 0 10 3 3 0 1 0 8 0 inpcb 280 5416 0 5398 4 2 2 2 0 8 0 nd6 48 666 0 660 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 10154 0 9962 28 15 13 13 0 8 1 art_table 32 10155 0 9962 2 0 2 2 0 8 0 art_node 16 2466 0 2426 1 0 1 1 0 8 0 sysvmsgpl 40 34 0 26 1 0 1 1 0 8 0 semupl 112 4 0 4 1 1 0 1 0 8 0 semapl 112 1047 0 1037 1 0 1 1 0 8 0 shmpl 112 134 0 6 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 13139 0 11684 51 3 48 48 0 8 0 ffsino 272 13139 0 11684 100 2 98 98 0 8 0 nchpl 144 26162 0 24531 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 108866 0 108866 3 2 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 81632 0 81632 35 34 1 7 0 8 1 plimitpl 152 1671 0 1662 1 0 1 1 0 8 0 sigapl 432 10977 0 10961 15 13 2 3 0 8 0 futexpl 56 91345 0 91345 2 1 1 1 0 8 1 knotepl 112 6417 0 6398 1 0 1 1 0 8 0 kqueuepl 104 2021 0 2019 1 0 1 1 0 8 0 pipepl 112 6694 0 6671 10 8 2 2 0 8 0 fdescpl 488 10978 0 10961 3 0 3 3 0 8 0 filepl 152 61072 0 60955 21 16 5 7 0 8 0 lockfpl 104 1906 0 1906 16 15 1 1 0 8 1 lockfspl 48 783 0 783 16 15 1 1 0 8 1 sessionpl 112 237 0 227 1 0 1 1 0 8 0 pgrppl 48 323 0 313 1 0 1 1 0 8 0 ucredpl 96 17665 0 17656 1 0 1 1 0 8 0 zombiepl 144 10963 0 10961 2 1 1 1 0 8 0 processpl 896 10994 0 10961 4 0 4 4 0 8 0 procpl 632 25979 0 25936 33 28 5 5 0 8 1 srpgc 64 440 0 440 26 25 1 1 0 8 1 sosppl 128 153 0 153 33 33 0 1 0 8 0 sockpl 384 10202 0 10185 13 10 3 4 0 8 1 mcl64k 65536 16 0 0 2 0 2 2 0 8 0 mcl16k 16384 15 0 0 2 0 2 2 0 8 0 mcl12k 12288 43 0 0 2 0 2 2 0 8 0 mcl9k 9216 39 0 0 2 0 2 2 0 8 0 mcl8k 8192 25 0 0 3 0 3 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 13 0 0 1 0 1 1 0 8 0 mcl2k 2048 339 0 0 10 1 9 10 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 722 0 0 15 2 13 15 0 8 0 bufpl 256 27475 0 20461 439 0 439 439 0 8 0 anonpl 16 1102981 0 1098062 117 80 37 39 0 124 0 amapchunkpl 152 81099 0 80999 65 59 6 9 0 158 1 amappl16 192 49701 0 49495 262 241 21 23 0 8 8 amappl15 184 1625 0 1625 19 19 0 1 0 8 0 amappl14 176 3077 0 3064 1 0 1 1 0 8 0 amappl13 168 1464 0 1461 19 18 1 1 0 8 0 amappl12 160 1244 0 1236 2 1 1 1 0 8 0 amappl11 152 1981 0 1969 1 0 1 1 0 8 0 amappl10 144 1692 0 1680 2 1 1 1 0 8 0 amappl9 136 4295 0 4292 1 0 1 1 0 8 0 amappl8 128 3592 0 3505 4 0 4 4 0 8 0 amappl7 120 1966 0 1956 1 0 1 1 0 8 0 amappl6 112 1503 0 1486 1 0 1 1 0 8 0 amappl5 104 3250 0 3238 1 0 1 1 0 8 0 amappl4 96 10896 0 10859 2 1 1 2 0 8 0 amappl3 88 2588 0 2578 1 0 1 1 0 8 0 amappl2 80 70549 0 70466 4 2 2 3 0 8 0 amappl1 72 293026 0 292548 25 15 10 19 0 8 0 amappl 80 29786 0 29744 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 64 135 0 6 3 0 3 3 0 8 0 uaddrrnd 24 10978 0 10961 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 10978 0 10961 1 0 1 1 0 8 0 vmmpekpl 168 86006 0 85974 2 0 2 2 0 8 0 vmmpepl 168 1353540 0 1351903 281 201 80 86 0 357 7 vmsppl 368 10977 0 10961 2 0 2 2 0 8 0 pdppl 4096 21963 0 21922 7 1 6 6 0 8 0 pvpl 32 3300883 0 3292606 455 353 102 113 0 265 16 pmappl 232 10977 0 10961 21 20 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 621 0 25 18 0 18 18 0 8 0