witness: userret: returning with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd8067bc3a28) #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_writev+0xa7 sys/kern/sys_generic.c:311 #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 * 39866 96729 32767 0x1010 0x4080000 0 syz-executor.1 337787 81349 73 0x100010 0 1 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,ffffffff822124ef) at witness_warn+0x69e witness_debugger sys/kern/subr_witness.c:2509 [inline] witness_warn(2,0,ffffffff822124ef) at witness_warn+0x69e sys/kern/subr_witness.c:1454 userret(ffff800020a88a00) at userret+0x36a sys/kern/kern_sig.c:1916 syscall(ffff800024d47230) at syscall+0x44a mi_syscall_return sys/sys/syscall_mi.h:115 [inline] syscall(ffff800024d47230) at syscall+0x44a sys/arch/amd64/amd64/trap.c:577 Xsyscall(6,5,d,0,3,4f69f3bd010) at Xsyscall+0x128 end of kernel end trace frame: 0x4f8c5229a90, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic witness_warn ddb{0}> 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,ffffffff822124ef) at witness_warn+0x69e witness_debugger sys/kern/subr_witness.c:2509 [inline] witness_warn(2,0,ffffffff822124ef) at witness_warn+0x69e sys/kern/subr_witness.c:1454 userret(ffff800020a88a00) at userret+0x36a sys/kern/kern_sig.c:1916 syscall(ffff800024d47230) at syscall+0x44a mi_syscall_return sys/sys/syscall_mi.h:115 [inline] syscall(ffff800024d47230) at syscall+0x44a sys/arch/amd64/amd64/trap.c:577 Xsyscall(6,5,d,0,3,4f69f3bd010) at Xsyscall+0x128 end of kernel end trace frame: 0x4f8c5229a90, count: -6 ddb{0}> show registers rdi 0 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800024d46f70 rbx 0xffff800024d47020 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800020b30000 rax 0xffff800000a72880 r8 0xffffffff81c84aa3 kprintf+0x173 r9 0x1 r10 0x25 r11 0xdaad6094d5dc3688 r12 0x3000000008 r13 0xffff800024d46f80 r14 0x100 r15 0x1 rip 0xffffffff81b17e18 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024d46f60 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=39866 stat=onproc flags process=1010 proc=4080000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020a88510,0xffff800020a88030 process=0xffff800020a8ae10 user=0xffff800024d42000, vmspace=0xfffffd807f00ba10 estcpu=36, cpticks=5, pctcpu=0.0 user=0, sys=5, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 1027 59600 21268 32767 2 0x10 syz-executor.0 96729 371633 86936 32767 3 0x3010 suspend syz-executor.1 *96729 39866 86936 32767 7 0x4081010 syz-executor.1 96729 429476 86936 32767 2 0x4081010 syz-executor.1 96729 447859 86936 32767 2 0x4081010 syz-executor.1 86936 358375 27349 32767 3 0x90 nanosleep syz-executor.1 27349 205078 47132 0 3 0x82 wait syz-executor.1 21268 149976 14336 32767 3 0x90 nanosleep syz-executor.0 14336 321584 47132 0 3 0x82 wait syz-executor.0 21445 467519 0 0 3 0x14200 bored sosplice 47132 270605 3378 0 3 0x82 thrsleep syz-fuzzer 47132 132541 3378 0 3 0x4000082 thrsleep syz-fuzzer 47132 444716 3378 0 3 0x4000082 thrsleep syz-fuzzer 47132 333232 3378 0 3 0x4000082 thrsleep syz-fuzzer 47132 240559 3378 0 3 0x4000082 thrsleep syz-fuzzer 47132 116388 3378 0 3 0x4000082 kqread syz-fuzzer 47132 189887 3378 0 3 0x4000082 thrsleep syz-fuzzer 47132 43030 3378 0 3 0x4000082 thrsleep syz-fuzzer 47132 79931 3378 0 3 0x4000082 thrsleep syz-fuzzer 47132 183071 3378 0 3 0x4000082 thrsleep syz-fuzzer 3378 37400 94641 0 3 0x10008a pause ksh 94641 219160 4865 0 3 0x92 select sshd 50032 468003 1 0 3 0x100083 ttyin getty 4865 390197 1 0 3 0x80 select sshd 81349 337787 52896 73 7 0x100010 syslogd 52896 344004 1 0 3 0x100082 netio syslogd 76701 480471 1 77 3 0x100090 poll dhclient 35937 130480 1 0 3 0x80 poll dhclient 42981 439838 0 0 2 0x14200 zerothread 38334 246555 0 0 3 0x14200 aiodoned aiodoned 11091 139707 0 0 3 0x14200 syncer update 79552 24143 0 0 3 0x14200 cleaner cleaner 43696 95451 0 0 3 0x14200 reaper reaper 72599 54109 0 0 3 0x14200 pgdaemon pagedaemon 92510 73442 0 0 3 0x14200 bored crynlk 91603 92809 0 0 3 0x14200 bored crypto 87786 384106 0 0 3 0x40014200 acpi0 acpi0 54227 147368 0 0 3 0x40014200 idle1 14980 107084 0 0 3 0x14200 bored softnet 32734 355266 0 0 3 0x14200 bored systqmp 88064 291803 0 0 3 0x14200 bored systq 72496 175100 0 0 3 0x40014200 bored softclock 45344 293775 0 0 3 0x40014200 idle0 92064 456260 0 0 3 0x14200 bored smr 1 402364 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 1027 (syz-executor.0) thread 0xffff800020a88c78 (59600) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82624aa0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 pageflttrap+0x6f sys/arch/amd64/amd64/trap.c:162 #2 usertrap+0x249 sys/arch/amd64/amd64/trap.c:369 #3 recall_trap+0x8 Process 96729 (syz-executor.1) thread 0xffff800020a88a00 (39866) exclusive rrwlock inode r = 0 (0xfffffd8067bc3a28) #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_writev+0xa7 sys/kern/sys_generic.c:311 #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 81349 (syslogd) thread 0xffff800020ac0010 (337787) exclusive rrwlock inode r = 0 (0xfffffd806eb632b8) #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{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9463 6322K 6322K 78643K 11190 0 0 pcb 13 8K 8K 78643K 13 0 0 rtable 105 3K 3K 78643K 5931 0 0 ifaddr 36 14K 15K 78643K 824 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 367 0 0 iov 0 0K 28K 78643K 499 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1215 76K 76K 78643K 4416 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 93 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 816 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 8 25K 33K 78643K 7162 0 0 sigio 0 0K 0K 78643K 108 0 0 proc 41 38K 70K 78643K 6235 0 0 subproc 34 2K 2K 78643K 2210 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 926 0 0 in_multi 33 2K 2K 78643K 1695 0 0 ether_multi 1 0K 0K 78643K 52 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 2375 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 100 21K 31K 78643K 24166 0 0 UVM aobj 130 4K 4K 78643K 141 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 455 0 0 NDP 7 0K 0K 78643K 393 0 0 temp 121 3554K 3626K 78643K 32912 0 0 kqueue 0 0K 0K 78643K 99 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 262 0 256 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 579 0 577 1 0 1 1 0 8 0 rtentry 112 1453 0 1409 2 0 2 2 0 8 0 unpcb 120 2771 0 2763 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 3680 0 3680 1 1 0 1 0 8 0 tcpcb 544 1592 0 1588 1 0 1 1 0 8 0 ipq 40 7 0 7 5 5 0 1 0 8 0 ipqe 40 15 0 15 5 5 0 1 0 8 0 inpcb 280 3918 0 3907 4 3 1 2 0 8 0 nd6 48 390 0 384 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 5965 0 5773 22 9 13 13 0 8 0 art_table 32 5966 0 5773 2 0 2 2 0 8 0 art_node 16 1452 0 1412 1 0 1 1 0 8 0 sysvmsgpl 40 18 0 16 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 814 0 804 1 0 1 1 0 8 0 shmpl 112 139 0 11 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 8726 0 7285 47 0 47 47 0 8 0 ffsino 272 8726 0 7285 100 3 97 97 0 8 0 nchpl 144 17318 0 15688 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 71644 0 71644 3 2 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 48238 0 48238 33 32 1 7 0 8 1 plimitpl 152 1181 0 1172 1 0 1 1 0 8 0 sigapl 432 6949 0 6933 8 6 2 3 0 8 0 futexpl 56 66176 0 66176 2 1 1 1 0 8 1 knotepl 112 4100 0 4081 1 0 1 1 0 8 0 kqueuepl 104 1651 0 1649 1 0 1 1 0 8 0 pipepl 112 4736 0 4713 14 13 1 2 0 8 0 fdescpl 488 6950 0 6933 5 2 3 3 0 8 0 filepl 152 42841 0 42724 25 20 5 7 0 8 0 lockfpl 104 1234 0 1234 11 10 1 1 0 8 1 lockfspl 48 388 0 388 11 10 1 1 0 8 1 sessionpl 112 145 0 135 1 0 1 1 0 8 0 pgrppl 48 218 0 208 1 0 1 1 0 8 0 ucredpl 96 11569 0 11560 1 0 1 1 0 8 0 zombiepl 144 6934 0 6933 4 3 1 1 0 8 0 processpl 896 6966 0 6933 4 0 4 4 0 8 0 procpl 632 18078 0 18033 25 20 5 5 0 8 1 srpgc 64 256 0 256 20 19 1 1 0 8 1 sosppl 128 116 0 116 23 22 1 1 0 8 1 sockpl 384 7404 0 7385 13 10 3 4 0 8 0 mcl64k 65536 21 0 0 3 1 2 3 0 8 0 mcl16k 16384 12 0 0 2 0 2 2 0 8 0 mcl12k 12288 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 15 0 0 2 0 2 2 0 8 0 mcl4k 4096 20 0 0 3 0 3 3 0 8 0 mcl2k2 2112 8 0 0 1 0 1 1 0 8 0 mcl2k 2048 128 0 0 14 2 12 14 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 483 0 0 13 1 12 13 0 8 0 bufpl 256 25121 0 18107 439 0 439 439 0 8 0 anonpl 16 757785 0 751688 202 158 44 46 0 124 8 amapchunkpl 152 54956 0 54864 89 84 5 18 0 158 1 amappl16 192 31993 0 31604 208 180 28 32 0 8 7 amappl15 184 1007 0 1004 14 13 1 1 0 8 0 amappl14 176 1853 0 1844 1 0 1 1 0 8 0 amappl13 168 1116 0 1115 1 0 1 1 0 8 0 amappl12 160 426 0 422 1 0 1 1 0 8 0 amappl11 152 1204 0 1191 1 0 1 1 0 8 0 amappl10 144 1165 0 1162 1 0 1 1 0 8 0 amappl9 136 2974 0 2971 1 0 1 1 0 8 0 amappl8 128 2202 0 2166 2 0 2 2 0 8 0 amappl7 120 1249 0 1240 1 0 1 1 0 8 0 amappl6 112 962 0 947 1 0 1 1 0 8 0 amappl5 104 1413 0 1402 1 0 1 1 0 8 0 amappl4 96 7045 0 7011 1 0 1 1 0 8 0 amappl3 88 2110 0 2093 1 0 1 1 0 8 0 amappl2 80 45145 0 45071 3 1 2 3 0 8 0 amappl1 72 193481 0 193026 23 13 10 19 0 8 0 amappl 80 20314 0 20275 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 64 140 0 11 3 0 3 3 0 8 0 uaddrrnd 24 6950 0 6933 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 6950 0 6933 1 0 1 1 0 8 0 vmmpekpl 168 58937 0 58904 2 0 2 2 0 8 0 vmmpepl 168 893064 0 891352 230 144 86 95 0 357 9 vmsppl 368 6949 0 6933 2 0 2 2 0 8 0 pdppl 4096 13907 0 13866 8 2 6 6 0 8 0 pvpl 32 2052113 0 2042696 432 308 124 127 0 265 30 pmappl 232 6949 0 6933 16 15 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 618 0 22 18 0 18 18 0 8 0