witness: lock order reversal: 1st 0xfffffd8062d445e8 inode (&ip->i_lock) 2nd 0xfffffd807ad69250 fdlock (&newfdp->fd_fd.fd_lock) lock order "&newfdp->fd_fd.fd_lock"(rwlock) -> "&ip->i_lock"(rrwlock) first seen at: #0 witness_checkorder+0x6a7 sys/kern/subr_witness.c:879 #1 rw_enter+0xd1 sys/kern/kern_rwlock.c:247 #2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602 #4 vn_closefile+0x119 vn_lock sys/kern/vfs_vnops.c:561 [inline] #4 vn_closefile+0x119 vn_close sys/kern/vfs_vnops.c:288 [inline] #4 vn_closefile+0x119 sys/kern/vfs_vnops.c:587 #5 fdrop+0xc9 sys/kern/kern_descrip.c:1273 #6 closef+0x11d sys/kern/kern_descrip.c:1257 #7 finishdup+0x2b6 sys/kern/kern_descrip.c:686 #8 dodup3+0x5c5 sys/kern/kern_descrip.c:377 #9 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #9 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #10 Xsyscall+0x128 lock order "&ip->i_lock"(rrwlock) -> "&newfdp->fd_fd.fd_lock"(rwlock) first seen at: #0 witness_checkorder+0x6a7 sys/kern/subr_witness.c:879 #1 rw_enter_write+0x5b sys/kern/kern_rwlock.c:125 #2 diskmapioctl+0x237 sys/dev/diskmap.c:106 #3 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 #4 vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 #5 sys_ioctl+0x5b8 #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 Stopped at db_enter+0x18: addq $0x8,%rsp ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 witness_checkorder(fffffd807ad69250,9,0) at witness_checkorder+0xffc witness_debugger sys/kern/subr_witness.c:2506 [inline] witness_checkorder(fffffd807ad69250,9,0) at witness_checkorder+0xffc sys/kern/subr_witness.c:1086 rw_enter_write(fffffd807ad69240) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:125 diskmapioctl(5a00,c0106477,ffff800022189010,1,ffff800020ab13d8) at diskmapioctl+0x237 sys/dev/diskmap.c:106 VOP_IOCTL(fffffd806fa7e710,c0106477,ffff800022189010,1,fffffd807f7c6a80,ffff800020ab13d8) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8067c12b60,c0106477,ffff800022189010,ffff800020ab13d8) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 sys_ioctl(ffff800020ab13d8,ffff800022189128,ffff800022189190) at sys_ioctl+0x5b8 syscall(ffff800022189200) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800022189200) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff1b,0,3,dd96fe551b0) at Xsyscall+0x128 end of kernel end trace frame: 0xddb8b33f000, count: -9 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800022188bd0 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800021f7e000 rax 0xffff800000aba9c0 r8 0xffffffff8157a035 witness_checkorder+0xfd5 r9 0x5 r10 0x3 r11 0x9f8123fb446065e4 r12 0xfffffd80029bac00 r13 0 r14 0xffffffff825a9270 w_lodata+0x3c8b0 r15 0xffffffff825c0f50 w_lodata+0x54590 rip 0xffffffff810d7398 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800022188bc0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=233228 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=80, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab0018,0xffff800020ab0790 process=0xffff800020adc000 user=0xffff800022184000, vmspace=0xfffffd807f00b2e0 estcpu=30, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 50553 90165 10606 0 7 0 syz-executor.1 50553 467565 10606 0 2 0x4000000 syz-executor.1 50553 114139 10606 0 2 0x4000000 syz-executor.1 *50553 233228 10606 0 7 0x4000000 syz-executor.1 50553 405904 10606 0 2 0x4000000 syz-executor.1 10606 325066 49485 0 3 0x82 nanosleep syz-executor.1 61114 502418 0 0 3 0x14200 acct acct 84970 464713 1 0 3 0x100083 ttyin getty 14846 82774 0 0 3 0x14200 bored sosplice 49485 264555 19467 0 3 0x82 thrsleep syz-fuzzer 49485 87132 19467 0 3 0x4000082 thrsleep syz-fuzzer 49485 377326 19467 0 3 0x4000082 thrsleep syz-fuzzer 49485 254984 19467 0 3 0x4000082 thrsleep syz-fuzzer 49485 414616 19467 0 3 0x4000082 thrsleep syz-fuzzer 49485 350278 19467 0 3 0x4000082 thrsleep syz-fuzzer 49485 410534 19467 0 3 0x4000082 thrsleep syz-fuzzer 49485 96280 19467 0 3 0x4000082 kqread syz-fuzzer 49485 185069 19467 0 3 0x4000082 thrsleep syz-fuzzer 49485 443339 19467 0 3 0x4000082 thrsleep syz-fuzzer 19467 79421 59508 0 3 0x10008a pause ksh 59508 119296 92711 0 3 0x92 select sshd 92711 283905 1 0 3 0x80 select sshd 93564 150334 10098 74 3 0x100092 bpf pflogd 10098 427209 1 0 3 0x80 netio pflogd 47281 213311 65309 73 3 0x100090 kqread syslogd 65309 254371 1 0 3 0x100082 netio syslogd 42554 82716 1 77 3 0x100090 poll dhclient 39369 448671 1 0 3 0x80 poll dhclient 87982 51405 0 0 3 0x14200 pgzero zerothread 23993 313129 0 0 3 0x14200 aiodoned aiodoned 18136 353456 0 0 3 0x14200 syncer update 59648 194305 0 0 3 0x14200 cleaner cleaner 42718 342421 0 0 3 0x14200 reaper reaper 47332 517229 0 0 3 0x14200 pgdaemon pagedaemon 70251 89587 0 0 3 0x14200 bored crynlk 97667 398630 0 0 3 0x14200 bored crypto 5561 218855 0 0 3 0x40014200 acpi0 acpi0 24064 231203 0 0 3 0x40014200 idle1 91789 27776 0 0 3 0x14200 bored softnet 76854 155635 0 0 3 0x14200 bored systqmp 49721 349113 0 0 3 0x14200 bored systq 67380 67765 0 0 3 0x40014200 bored softclock 98940 139487 0 0 3 0x40014200 idle0 15959 254957 0 0 3 0x14200 bored smr 1 271047 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 50553 (syz-executor.1) thread 0xffff800020ab13d8 (233228) exclusive rrwlock inode r = 0 (0xfffffd8062d445e8) #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 spec_open+0x431 sys/kern/spec_vnops.c:159 #6 VOP_OPEN+0x6a sys/kern/vfs_vops.c:153 #7 vn_open+0x495 sys/kern/vfs_vnops.c:174 #8 diskmapioctl+0x18e sys/dev/diskmap.c:91 #9 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 #10 vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 #11 sys_ioctl+0x5b8 #12 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #12 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #13 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8262ca18) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 __mp_acquire_count+0x51 sys/kern/kern_lock.c:227 #2 mi_switch+0x38f sys/kern/sched_bsd.c:441 #3 sleep_finish+0x113 sys/kern/kern_synch.c:373 #4 rw_enter+0x366 sys/kern/kern_rwlock.c:282 #5 rrw_enter+0x4f sys/kern/kern_rwlock.c:435 #6 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602 #7 vn_lock+0x6e sys/kern/vfs_vnops.c:561 #8 spec_open+0x431 sys/kern/spec_vnops.c:159 #9 VOP_OPEN+0x6a sys/kern/vfs_vops.c:153 #10 vn_open+0x495 sys/kern/vfs_vnops.c:174 #11 diskmapioctl+0x18e sys/dev/diskmap.c:91 #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9611 6464K 15030K 78643K 32372 0 0 pcb 13 8K 8K 78643K 693 0 0 rtable 95 12K 13K 78643K 3194 0 0 ifaddr 81 22K 28K 78643K 1164 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1919 0 0 iov 0 0K 28K 78643K 810 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1202 75K 77K 78643K 8980 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 119 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 964 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 4 9K 25K 78643K 8714 0 0 sigio 0 0K 0K 78643K 128 0 0 proc 54 51K 83K 78643K 2327 0 0 subproc 16 1K 2K 78643K 552 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 769 0 0 in_multi 22 1K 2K 78643K 574 0 0 ether_multi 1 0K 0K 78643K 30 0 0 mrt 0 0K 0K 78643K 21 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 1319 0 0 pfkey data 0 0K 4K 78643K 2 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 111 14K 31K 78643K 29077 0 0 UVM aobj 130 6K 6K 78643K 146 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 625 0 0 NDP 20 0K 0K 78643K 355 0 0 temp 212 3556K 3637K 78643K 116216 0 0 kqueue 0 0K 0K 78643K 65 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 66 0 62 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 365 0 363 1 0 1 1 0 8 0 rtentry 112 386 0 353 4 3 1 2 0 8 0 unpcb 120 2700 0 2690 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 sackhl 24 2 0 2 2 2 0 1 0 8 0 tcpqe 32 9486 0 9486 1 1 0 1 0 8 0 tcpcb 544 1529 0 1525 1 0 1 1 0 8 0 inpcb 280 4324 0 4317 5 4 1 2 0 8 0 rttmr 72 3 0 3 3 3 0 1 0 8 0 nd6 48 96 0 93 1 0 1 1 0 8 0 pkpcb 40 37 0 37 15 15 0 1 0 8 0 ppxss 1128 203 0 203 26 25 1 1 0 8 1 pffrag 232 17 0 17 9 9 0 1 0 482 0 pffrnode 88 17 0 17 9 9 0 1 0 8 0 pffrent 40 37 0 37 9 9 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 24 243 0 227 1 0 1 1 0 8 0 pfstkey 112 245 0 229 2 0 2 2 0 8 0 pfstate 328 245 0 229 4 0 4 4 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 1624 0 1474 23 13 10 13 0 8 0 art_table 32 1625 0 1474 2 0 2 2 0 8 0 art_node 16 377 0 347 1 0 1 1 0 8 0 sysvmsgpl 40 22 0 9 1 0 1 1 0 8 0 semapl 112 962 0 952 1 0 1 1 0 8 0 shmpl 112 144 0 16 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 14642 0 13208 47 0 47 47 0 8 0 ffsino 272 14642 0 13208 97 0 97 97 0 8 0 nchpl 144 26760 0 25139 62 0 62 62 0 8 0 uvmvnodes 72 6496 0 0 119 0 119 119 0 8 0 vnodes 200 6496 0 0 342 0 342 342 0 8 0 namei 1024 88650 0 88650 3 2 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 29 0 29 20 20 0 1 0 8 0 scxspl 192 75765 0 75765 31 30 1 7 0 8 1 plimitpl 152 836 0 829 1 0 1 1 0 8 0 sigapl 432 8825 0 8811 3 1 2 3 0 8 0 futexpl 56 106944 0 106944 2 1 1 1 0 8 1 knotepl 112 1902 0 1889 1 0 1 1 0 8 0 kqueuepl 104 1717 0 1715 1 0 1 1 0 8 0 pipepl 112 4818 0 4805 9 8 1 2 0 8 0 fdescpl 488 8826 0 8811 3 0 3 3 0 8 0 filepl 152 51794 0 51711 18 13 5 7 0 8 1 lockfpl 104 2881 0 2881 4 3 1 1 0 8 1 lockfspl 48 944 0 944 4 3 1 1 0 8 1 sessionpl 112 49 0 39 1 0 1 1 0 8 0 pgrppl 48 98 0 88 1 0 1 1 0 8 0 ucredpl 96 10079 0 10069 1 0 1 1 0 8 0 zombiepl 144 8812 0 8812 3 2 1 1 0 8 1 processpl 896 8844 0 8812 4 0 4 4 0 8 0 procpl 632 26732 0 26687 19 14 5 5 0 8 1 srpgc 64 65 0 65 27 27 0 1 0 8 0 sosppl 128 108 0 108 28 27 1 1 0 8 1 sockpl 384 7536 0 7517 11 8 3 4 0 8 1 mcl64k 65536 258 0 0 32 28 4 32 0 8 0 mcl16k 16384 14 0 0 2 0 2 2 0 8 0 mcl12k 12288 41 0 0 2 0 2 2 0 8 0 mcl9k 9216 22 0 0 2 0 2 2 0 8 0 mcl8k 8192 21 0 0 3 1 2 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 8 0 0 1 0 1 1 0 8 0 mcl2k 2048 139 0 0 15 4 11 15 0 8 0 mtagpl 80 61 0 0 1 0 1 1 0 8 0 mbufpl 256 659 0 0 23 5 18 23 0 8 1 bufpl 256 28119 0 21100 439 0 439 439 0 8 0 anonpl 16 833692 0 824015 260 204 56 68 0 124 0 amapchunkpl 152 53848 0 53736 56 50 6 11 0 158 0 amappl16 192 43717 0 43039 278 241 37 48 0 8 1 amappl15 184 854 0 854 5 5 0 1 0 8 0 amappl14 176 1630 0 1625 1 0 1 1 0 8 0 amappl13 168 2653 0 2653 5 5 0 1 0 8 0 amappl12 160 748 0 747 1 0 1 1 0 8 0 amappl11 152 1183 0 1164 1 0 1 1 0 8 0 amappl10 144 1545 0 1541 1 0 1 1 0 8 0 amappl9 136 1956 0 1954 1 0 1 1 0 8 0 amappl8 128 1461 0 1422 2 0 2 2 0 8 0 amappl7 120 1555 0 1548 1 0 1 1 0 8 0 amappl6 112 1095 0 1082 1 0 1 1 0 8 0 amappl5 104 1108 0 1093 1 0 1 1 0 8 0 amappl4 96 9594 0 9562 2 1 1 2 0 8 0 amappl3 88 1305 0 1294 1 0 1 1 0 8 0 amappl2 80 70004 0 69935 3 1 2 3 0 8 0 amappl1 72 197945 0 197504 26 16 10 20 0 8 0 amappl 80 27548 0 27510 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 64 145 0 16 3 0 3 3 0 8 0 uaddrrnd 24 8826 0 8811 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 8826 0 8811 1 0 1 1 0 8 0 vmmpekpl 168 65979 0 65943 2 0 2 2 0 8 0 vmmpepl 168 1071196 0 1069424 423 318 105 110 0 357 17 vmsppl 368 8825 0 8811 2 0 2 2 0 8 0 pdppl 4096 17659 0 17622 7 1 6 6 0 8 1 pvpl 32 2210004 0 2197118 487 352 135 168 0 265 0 pmappl 232 8825 0 8811 4 3 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 658 0 57 19 0 19 19 0 8 0