witness: lock order reversal: 1st 0xfffffd806e169d68 inode (&ip->i_lock) 2nd 0xfffffd807c6cb438 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 witness_checkorder(fffffd807c6cb438,9,0) at witness_checkorder+0xffc witness_debugger sys/kern/subr_witness.c:2506 [inline] witness_checkorder(fffffd807c6cb438,9,0) at witness_checkorder+0xffc sys/kern/subr_witness.c:1086 rw_enter_write(fffffd807c6cb428) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:125 diskmapioctl(5a00,c0106477,ffff800022fb5510,1,ffff800020ab1b40) at diskmapioctl+0x237 sys/dev/diskmap.c:106 VOP_IOCTL(fffffd806fa81580,c0106477,ffff800022fb5510,1,fffffd807f7c6960,ffff800020ab1b40) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 vn_ioctl(fffffd807625b3a8,c0106477,ffff800022fb5510,ffff800020ab1b40) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 sys_ioctl(ffff800020ab1b40,ffff800022fb5628,ffff800022fb5690) at sys_ioctl+0x5b8 syscall(ffff800022fb5700) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800022fb5700) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff1b,0,3,e7ea7da9010) at Xsyscall+0x128 end of kernel end trace frame: 0xe8133e4d380, count: -9 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800022fb50d0 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800021558000 rax 0xffff800000ab6740 r8 0xffffffff816e6485 witness_checkorder+0xfd5 r9 0x5 r10 0x3 r11 0x87496ed67f125f12 r12 0xfffffd80029bbc00 r13 0 r14 0xffffffff825f9de0 w_lodata+0x422c0 r15 0xffffffff8260c0b0 w_lodata+0x54590 rip 0xffffffff81fc9258 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800022fb50c0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=17689 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab09f8,0xffff800020ab0028 process=0xffff800020a4b888 user=0xffff800022fb0000, vmspace=0xfffffd807f00ca10 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 37682 266053 6371 0 3 0x80 nanosleep syz-executor.0 37682 431977 6371 0 3 0x4000080 fsleep syz-executor.0 37682 380821 6371 0 3 0x4000080 fsleep syz-executor.0 22568 516157 32224 0 2 0 syz-executor.1 *22568 17689 32224 0 7 0x4000000 syz-executor.1 22568 295909 32224 0 2 0x4000000 syz-executor.1 22568 341412 32224 0 7 0x4000000 syz-executor.1 32224 102958 47248 0 3 0x82 nanosleep syz-executor.1 6371 264096 47248 0 3 0x82 nanosleep syz-executor.0 23017 345176 0 0 3 0x14200 acct acct 15183 188685 0 0 3 0x14200 bored sosplice 47248 48299 27454 0 3 0x82 thrsleep syz-fuzzer 47248 162557 27454 0 3 0x4000082 thrsleep syz-fuzzer 47248 316461 27454 0 3 0x4000082 thrsleep syz-fuzzer 47248 484305 27454 0 3 0x4000082 thrsleep syz-fuzzer 47248 78494 27454 0 3 0x4000082 thrsleep syz-fuzzer 47248 249029 27454 0 3 0x4000082 thrsleep syz-fuzzer 47248 300998 27454 0 3 0x4000082 thrsleep syz-fuzzer 47248 405975 27454 0 3 0x4000082 thrsleep syz-fuzzer 47248 222599 27454 0 3 0x4000082 kqread syz-fuzzer 47248 317015 27454 0 3 0x4000082 thrsleep syz-fuzzer 27454 267623 29307 0 3 0x10008a pause ksh 29307 475970 8180 0 3 0x92 select sshd 52004 24793 1 0 3 0x100083 ttyin getty 8180 313232 1 0 3 0x80 select sshd 97236 447397 71579 74 3 0x100092 bpf pflogd 71579 63813 1 0 3 0x80 netio pflogd 59338 262916 44461 73 3 0x100090 kqread syslogd 44461 70770 1 0 3 0x100082 netio syslogd 18475 437264 1 77 3 0x100090 poll dhclient 73763 8583 1 0 3 0x80 poll dhclient 17489 40936 0 0 3 0x14200 pgzero zerothread 47679 63748 0 0 3 0x14200 aiodoned aiodoned 13665 71022 0 0 3 0x14200 syncer update 38682 102666 0 0 3 0x14200 cleaner cleaner 27952 295702 0 0 3 0x14200 reaper reaper 84514 262516 0 0 3 0x14200 pgdaemon pagedaemon 51945 254719 0 0 3 0x14200 bored crynlk 75325 68657 0 0 3 0x14200 bored crypto 31561 288850 0 0 3 0x40014200 acpi0 acpi0 22338 395680 0 0 3 0x40014200 idle1 67110 339447 0 0 3 0x14200 bored softnet 96627 190239 0 0 3 0x14200 bored systqmp 91535 261058 0 0 3 0x14200 bored systq 1941 210319 0 0 3 0x40014200 bored softclock 15245 417875 0 0 3 0x40014200 idle0 36068 277883 0 0 3 0x14200 bored smr 1 38459 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 22568 (syz-executor.1) thread 0xffff800020ab1b40 (17689) exclusive rrwlock inode r = 0 (0xfffffd806e169d68) #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 (0xffffffff8265b828) #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{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9585 6448K 7568K 78643K 17307 0 0 pcb 13 8K 8K 78643K 1525 0 0 rtable 112 12K 12K 78643K 1320 0 0 ifaddr 80 17K 18K 78643K 321 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1614 0 0 iov 0 0K 16K 78643K 257 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1207 76K 77K 78643K 3762 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 44 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 271 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 6 17K 25K 78643K 3916 0 0 sigio 0 0K 0K 78643K 41 0 0 proc 54 51K 83K 78643K 1103 0 0 subproc 32 2K 2K 78643K 221 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 265 0 0 in_multi 33 2K 2K 78643K 253 0 0 ether_multi 1 0K 0K 78643K 15 0 0 mrt 211 13K 13K 78643K 475 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 78 344K 344K 78643K 78 0 0 exec 0 0K 1K 78643K 523 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 102 21K 31K 78643K 12592 0 0 UVM aobj 118 7K 7K 78643K 130 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 1322 0 0 NDP 19 0K 0K 78643K 101 0 0 temp 221 3556K 4186K 78643K 41319 0 0 kqueue 0 0K 0K 78643K 24 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 29 0 23 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 165 0 163 1 0 1 1 0 8 0 rtentry 112 168 0 124 3 1 2 2 0 8 0 unpcb 120 875 0 865 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 9375 0 9375 1 1 0 1 0 8 0 tcpcb 544 1142 0 1138 1 0 1 1 0 8 0 inpcb 280 3552 0 3545 4 3 1 2 0 8 0 nd6 48 39 0 33 2 1 1 1 0 8 0 pkpcb 40 15 0 15 6 6 0 1 0 8 0 ppxss 1128 37 0 37 12 11 1 1 0 8 1 pffrag 232 5 0 5 2 2 0 1 0 482 0 pffrnode 88 5 0 5 2 2 0 1 0 8 0 pffrent 40 12 0 12 2 2 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 24 180 0 164 1 0 1 1 0 8 0 pfstkey 112 180 0 164 4 2 2 4 0 8 0 pfstate 328 180 0 164 11 8 3 11 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 256 699 0 508 19 6 13 13 0 8 0 art_table 32 700 0 508 3 1 2 2 0 8 0 art_node 16 166 0 126 1 0 1 1 0 8 0 sysvmsgpl 40 21 0 21 1 1 0 1 0 8 0 semapl 112 267 0 257 1 0 1 1 0 8 0 shmpl 112 128 0 12 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 6700 0 5277 47 0 47 47 0 8 0 ffsino 272 6700 0 5277 96 0 96 96 0 8 0 nchpl 144 11877 0 10252 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 35762 0 35762 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 7 0 7 3 3 0 1 0 8 0 scxspl 192 34130 0 34130 20 19 1 7 0 8 1 plimitpl 152 238 0 230 1 0 1 1 0 8 0 sigapl 432 4083 0 4067 3 1 2 3 0 8 0 futexpl 56 45987 0 45985 1 0 1 1 0 8 0 knotepl 112 713 0 694 1 0 1 1 0 8 0 kqueuepl 104 556 0 554 1 0 1 1 0 8 0 pipepl 112 1640 0 1619 3 2 1 2 0 8 0 fdescpl 488 4084 0 4067 3 0 3 3 0 8 0 filepl 152 20784 0 20677 9 4 5 7 0 8 0 lockfpl 104 944 0 944 2 1 1 1 0 8 1 lockfspl 48 326 0 326 2 1 1 1 0 8 1 sessionpl 112 29 0 18 1 0 1 1 0 8 0 pgrppl 48 54 0 43 1 0 1 1 0 8 0 ucredpl 96 3177 0 3168 1 0 1 1 0 8 0 zombiepl 144 4068 0 4068 2 1 1 1 0 8 1 processpl 896 4102 0 4068 4 0 4 4 0 8 0 procpl 632 11282 0 11234 12 7 5 5 0 8 1 srpgc 64 22 0 22 8 7 1 1 0 8 1 sosppl 128 53 0 53 10 9 1 1 0 8 1 sockpl 384 4644 0 4625 5 2 3 4 0 8 1 mcl64k 65536 13 0 0 2 0 2 2 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 16 0 0 2 0 2 2 0 8 0 mcl8k 8192 14 0 0 2 0 2 2 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 7 0 0 1 0 1 1 0 8 0 mcl2k 2048 184 0 0 21 0 21 21 0 8 1 mtagpl 80 28 0 0 1 0 1 1 0 8 0 mbufpl 256 324 0 0 16 0 16 16 0 8 0 bufpl 256 11979 0 4960 439 0 439 439 0 8 0 anonpl 16 356916 0 344628 135 77 58 67 0 124 5 amapchunkpl 152 22400 0 22279 28 18 10 12 0 158 3 amappl16 192 19096 0 18395 110 74 36 46 0 8 0 amappl15 184 235 0 234 2 1 1 1 0 8 0 amappl14 176 737 0 730 1 0 1 1 0 8 0 amappl13 168 283 0 283 3 3 0 1 0 8 0 amappl12 160 666 0 665 1 0 1 1 0 8 0 amappl11 152 97 0 81 1 0 1 1 0 8 0 amappl10 144 793 0 785 1 0 1 1 0 8 0 amappl9 136 1699 0 1696 1 0 1 1 0 8 0 amappl8 128 1223 0 1203 1 0 1 1 0 8 0 amappl7 120 766 0 756 1 0 1 1 0 8 0 amappl6 112 73 0 64 1 0 1 1 0 8 0 amappl5 104 864 0 850 1 0 1 1 0 8 0 amappl4 96 3702 0 3666 2 1 1 2 0 8 0 amappl3 88 1538 0 1526 1 0 1 1 0 8 0 amappl2 80 31177 0 31096 3 1 2 3 0 8 0 amappl1 72 94512 0 94056 25 15 10 19 0 8 0 amappl 80 11725 0 11681 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 64 129 0 12 2 0 2 2 0 8 0 uaddrrnd 24 4084 0 4067 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4084 0 4067 1 0 1 1 0 8 0 vmmpekpl 168 30702 0 30671 2 0 2 2 0 8 0 vmmpepl 168 495704 0 493759 212 107 105 105 0 357 20 vmsppl 368 4083 0 4067 2 0 2 2 0 8 0 pdppl 4096 8175 0 8134 7 1 6 6 0 8 0 pvpl 32 990477 0 974866 275 128 147 165 0 265 13 pmappl 232 4083 0 4067 2 1 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 619 0 11 18 0 18 18 0 8 0