witness: userret: returning with the following locks held: exclusive rrwlock inode r = 0 (0xfffffd806e22d6f8) #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_ftruncate+0x140 sys/kern/vfs_syscalls.c:2759 #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 panic: witness_warn Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *177240 95723 0 0 0x4000000 0 syz-executor.0 88303 10784 0 0x2 0 1 syz-executor.1 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,ffffffff81fbc3d5) at witness_warn+0x69e witness_debugger sys/kern/subr_witness.c:2509 [inline] witness_warn(2,0,ffffffff81fbc3d5) at witness_warn+0x69e sys/kern/subr_witness.c:1454 userret(ffff800020b289f8) at userret+0x36a sys/kern/kern_sig.c:1911 syscall(ffff800021c1bd20) at syscall+0x44a mi_syscall_return sys/sys/syscall_mi.h:115 [inline] syscall(ffff800021c1bd20) at syscall+0x44a sys/arch/amd64/amd64/trap.c:577 Xsyscall(6,9,fffffffffffffeea,0,3,ad747cd61b0) at Xsyscall+0x128 end of kernel end trace frame: 0xad9b2778410, 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,ffffffff81fbc3d5) at witness_warn+0x69e witness_debugger sys/kern/subr_witness.c:2509 [inline] witness_warn(2,0,ffffffff81fbc3d5) at witness_warn+0x69e sys/kern/subr_witness.c:1454 userret(ffff800020b289f8) at userret+0x36a sys/kern/kern_sig.c:1911 syscall(ffff800021c1bd20) at syscall+0x44a mi_syscall_return sys/sys/syscall_mi.h:115 [inline] syscall(ffff800021c1bd20) at syscall+0x44a sys/arch/amd64/amd64/trap.c:577 Xsyscall(6,9,fffffffffffffeea,0,3,ad747cd61b0) at Xsyscall+0x128 end of kernel end trace frame: 0xad9b2778410, count: -6 ddb{0}> show registers rdi 0 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800021c1ba60 rbx 0xffff800021c1bb10 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800021e3e000 rax 0xffff80000097c380 r8 0xffffffff8116f7e3 kprintf+0x173 r9 0x1 r10 0x25 r11 0xd40b152c90b74f45 r12 0x3000000008 r13 0xffff800021c1ba70 r14 0x100 r15 0x1 rip 0xffffffff812b5188 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021c1ba50 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=177240 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020b28ee8,0xffff800020affb40 process=0xffff800020b7c380 user=0xffff800021c16000, vmspace=0xfffffd807effd8a0 estcpu=36, cpticks=4, pctcpu=0.0 user=0, sys=4, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 30472 285513 10784 0 2 0 syz-executor.1 95723 208564 58400 0 2 0 syz-executor.0 95723 91125 58400 0 3 0x4000080 fsleep syz-executor.0 95723 114666 58400 0 2 0x4000000 syz-executor.0 *95723 177240 58400 0 7 0x4000000 syz-executor.0 58400 22651 15884 0 2 0x482 syz-executor.0 53060 165745 1 0 3 0x100083 ttyin getty 10784 88303 15884 0 7 0x2 syz-executor.1 79743 308340 0 0 3 0x14200 bored sosplice 15884 307524 61180 0 3 0x82 thrsleep syz-fuzzer 15884 18182 61180 0 2 0x4000082 syz-fuzzer 15884 446358 61180 0 3 0x4000082 thrsleep syz-fuzzer 15884 385515 61180 0 3 0x4000082 thrsleep syz-fuzzer 15884 229683 61180 0 3 0x4000082 thrsleep syz-fuzzer 15884 294999 61180 0 3 0x4000082 thrsleep syz-fuzzer 15884 456773 61180 0 3 0x4000082 thrsleep syz-fuzzer 15884 32716 61180 0 3 0x4000082 thrsleep syz-fuzzer 15884 126107 61180 0 3 0x4000082 kqread syz-fuzzer 15884 414907 61180 0 2 0x4000082 syz-fuzzer 61180 151249 11798 0 3 0x10008a pause ksh 11798 51087 10924 0 2 0x92 sshd 10924 69396 1 0 3 0x80 select sshd 23667 396634 33625 74 3 0x100092 bpf pflogd 33625 513314 1 0 3 0x80 netio pflogd 79201 12737 40922 73 2 0x100010 syslogd 40922 65322 1 0 3 0x100082 netio syslogd 3268 354039 1 77 3 0x100090 poll dhclient 76036 72300 1 0 3 0x80 poll dhclient 56253 308482 0 0 2 0x14200 zerothread 61374 299286 0 0 3 0x14200 aiodoned aiodoned 7895 412471 0 0 3 0x14200 syncer update 54105 169225 0 0 3 0x14200 cleaner cleaner 80014 187014 0 0 3 0x14200 reaper reaper 34755 337987 0 0 3 0x14200 pgdaemon pagedaemon 19231 251606 0 0 3 0x14200 bored crynlk 30000 311482 0 0 3 0x14200 bored crypto 60241 344984 0 0 3 0x40014200 acpi0 acpi0 20669 129898 0 0 3 0x40014200 idle1 91754 521657 0 0 3 0x14200 bored softnet 33071 126739 0 0 3 0x14200 bored systqmp 37548 379868 0 0 3 0x14200 bored systq 67672 118017 0 0 3 0x40014200 bored softclock 92222 498344 0 0 3 0x40014200 idle0 33501 171341 0 0 3 0x14200 bored smr 1 44004 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks CPU 1: exclusive mutex &map->flags_lock r = 0 (0xfffffd807effd4f0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 mtx_enter_try+0x102 #2 mtx_enter+0x4b sys/kern/kern_lock.c:266 #3 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5340 #4 uvmfault_lookup+0xbe sys/uvm/uvm_fault.c:1442 #5 uvm_fault+0xb9c uvmfault_amapcopy sys/uvm/uvm_fault.c:232 [inline] #5 uvm_fault+0xb9c sys/uvm/uvm_fault.c:559 #6 pageflttrap+0x20b sys/arch/amd64/amd64/trap.c:199 #7 usertrap+0x249 sys/arch/amd64/amd64/trap.c:369 #8 recall_trap+0x8 Process 95723 (syz-executor.0) thread 0xffff800020b289f8 (177240) exclusive rrwlock inode r = 0 (0xfffffd806e22d6f8) #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_ftruncate+0x140 sys/kern/vfs_syscalls.c:2759 #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 Process 10784 (syz-executor.1) thread 0xffff800020b29160 (88303) exclusive rwlock vmmaplk r = 0 (0xfffffd807effd468) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x46d sys/kern/kern_rwlock.c:306 #2 vm_map_lock_ln+0x10d sys/uvm/uvm_map.c:5337 #3 uvmfault_lookup+0xbe sys/uvm/uvm_fault.c:1442 #4 uvm_fault+0xb9c uvmfault_amapcopy sys/uvm/uvm_fault.c:232 [inline] #4 uvm_fault+0xb9c sys/uvm/uvm_fault.c:559 #5 pageflttrap+0x20b sys/arch/amd64/amd64/trap.c:199 #6 usertrap+0x249 sys/arch/amd64/amd64/trap.c:369 #7 recall_trap+0x8 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82374c30) #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 79201 (syslogd) thread 0xffff800020b60288 (12737) exclusive rrwlock inode r = 0 (0xfffffd806eb6bd58) #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:2789 #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 9599 6458K 14780K 78643K 28692 0 0 pcb 13 8K 8K 78643K 466 0 0 rtable 96 12K 13K 78643K 1758 0 0 ifaddr 79 18K 21K 78643K 798 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1799 0 0 iov 0 0K 32K 78643K 738 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1209 76K 77K 78643K 7547 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 112 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 1K 78643K 768 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 6 17K 25K 78643K 6820 0 0 sigio 1 0K 0K 78643K 61 0 0 proc 54 51K 83K 78643K 1319 0 0 subproc 32 2K 2K 78643K 124 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 682 0 0 in_multi 22 1K 2K 78643K 299 0 0 ether_multi 1 0K 0K 78643K 20 0 0 mrt 0 0K 0K 78643K 24 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 114 503K 503K 78643K 114 0 0 exec 0 0K 1K 78643K 801 0 0 pfkey data 0 0K 4K 78643K 7 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 101 21K 30K 78643K 23746 0 0 UVM aobj 130 8K 8K 78643K 153 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 ip6_options 0 0K 1K 78643K 330 0 0 NDP 19 0K 0K 78643K 220 0 0 temp 221 2748K 2828K 78643K 25067 0 0 kqueue 0 0K 0K 78643K 79 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 19 0 14 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 327 0 325 1 0 1 1 0 8 0 rtentry 112 120 0 86 2 0 2 2 0 8 0 unpcb 120 2141 0 2131 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 6809 0 6809 2 2 0 2 0 8 0 tcpcb 544 1154 0 1150 1 0 1 1 0 8 0 inpcb 280 3079 0 3071 2 1 1 2 0 8 0 rttmr 72 7 0 7 4 4 0 1 0 8 0 nd6 48 21 0 18 1 0 1 1 0 8 0 pkpcb 40 30 0 30 12 12 0 1 0 8 0 swfcl 56 4 0 0 1 0 1 1 0 8 0 ppxss 1128 149 0 149 15 14 1 1 0 8 1 pffrent 40 2 0 2 1 1 0 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 24 127 0 111 1 0 1 1 0 8 0 pfstkey 112 127 0 111 1 0 1 1 0 8 0 pfstate 328 127 0 111 3 1 2 3 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 256 424 0 277 15 3 12 13 0 8 0 art_table 32 425 0 277 2 0 2 2 0 8 0 art_node 16 108 0 77 1 0 1 1 0 8 0 sysvmsgpl 40 14 0 10 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 764 0 754 1 0 1 1 0 8 0 shmpl 112 151 0 23 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 12352 0 10951 47 0 47 47 0 8 0 ffsino 272 12352 0 10951 96 0 96 96 0 8 0 nchpl 144 22107 0 20469 62 0 62 62 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 71174 0 71174 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 18 0 18 10 10 0 1 0 8 0 scxspl 192 64765 0 64765 21 20 1 6 0 8 1 plimitpl 152 612 0 604 1 0 1 1 0 8 0 sigapl 432 7008 0 6992 3 1 2 3 0 8 0 futexpl 56 82383 0 82382 1 0 1 1 0 8 0 knotepl 112 1279 0 1260 1 0 1 1 0 8 0 kqueuepl 104 1592 0 1590 1 0 1 1 0 8 0 pipepl 112 4152 0 4131 13 12 1 2 0 8 0 fdescpl 488 7009 0 6992 3 0 3 3 0 8 0 filepl 152 42120 0 42011 17 12 5 7 0 8 0 lockfpl 104 2280 0 2280 2 1 1 1 0 8 1 lockfspl 48 808 0 808 2 1 1 1 0 8 1 sessionpl 112 26 0 15 1 0 1 1 0 8 0 pgrppl 48 96 0 85 1 0 1 1 0 8 0 ucredpl 96 8774 0 8765 1 0 1 1 0 8 0 zombiepl 144 6992 0 6992 2 1 1 1 0 8 1 processpl 896 7025 0 6992 4 0 4 4 0 8 0 procpl 632 22527 0 22482 15 10 5 5 0 8 1 srpgc 64 17 0 17 7 7 0 1 0 8 0 sosppl 128 104 0 104 22 21 1 1 0 8 1 sockpl 384 5629 0 5610 8 5 3 4 0 8 1 mcl64k 65536 513 0 0 65 33 32 65 0 8 1 mcl16k 16384 11 0 0 2 0 2 2 0 8 0 mcl12k 12288 35 0 0 3 1 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 28 0 0 3 1 2 3 0 8 0 mcl2k2 2112 10 0 0 1 0 1 1 0 8 0 mcl2k 2048 278 0 0 32 6 26 32 0 8 0 mtagpl 80 60 0 0 2 0 2 2 0 8 0 mbufpl 256 779 0 0 39 0 39 39 0 8 0 bufpl 256 19376 0 12347 440 0 440 440 0 8 0 anonpl 16 645298 0 633589 204 145 59 67 0 125 5 amapchunkpl 152 42856 0 42743 64 58 6 10 0 158 0 amappl16 192 33610 0 32947 198 156 42 46 0 8 8 amappl15 184 2876 0 2876 1 1 0 1 0 8 0 amappl14 176 2961 0 2956 1 0 1 1 0 8 0 amappl13 168 809 0 809 3 3 0 1 0 8 0 amappl12 160 38 0 36 2 1 1 1 0 8 0 amappl11 152 2148 0 2131 1 0 1 1 0 8 0 amappl10 144 198 0 191 1 0 1 1 0 8 0 amappl9 136 670 0 667 1 0 1 1 0 8 0 amappl8 128 210 0 190 1 0 1 1 0 8 0 amappl7 120 160 0 154 1 0 1 1 0 8 0 amappl6 112 2131 0 2122 1 0 1 1 0 8 0 amappl5 104 239 0 225 1 0 1 1 0 8 0 amappl4 96 7308 0 7277 2 1 1 2 0 8 0 amappl3 88 439 0 429 1 0 1 1 0 8 0 amappl2 80 58457 0 58385 3 1 2 3 0 8 0 amappl1 72 161731 0 161284 25 15 10 20 0 8 0 amappl 80 22926 0 22885 2 0 2 2 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 64 152 0 23 3 0 3 3 0 8 0 uaddrrnd 24 7009 0 6992 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 7009 0 6992 1 0 1 1 0 8 0 vmmpekpl 168 58715 0 58686 2 0 2 2 0 8 0 vmmpepl 168 856721 0 854844 281 186 95 116 0 357 10 vmsppl 368 7008 0 6992 2 0 2 2 0 8 0 pdppl 4096 14026 0 13984 6 0 6 6 0 8 0 pvpl 32 1690745 0 1675799 370 220 150 165 0 265 20 pmappl 232 7008 0 6992 4 3 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 714 0 47 21 0 21 21 0 8 0