witness: lock order reversal: 1st 0xfffffd8067e2ed58 inode (&ip->i_lock) 2nd 0xfffffd807cf59bd8 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(fffffd807cf59bd8,9,0) at witness_checkorder+0xffc witness_debugger sys/kern/subr_witness.c:2506 [inline] witness_checkorder(fffffd807cf59bd8,9,0) at witness_checkorder+0xffc sys/kern/subr_witness.c:1086 rw_enter_write(fffffd807cf59bc8) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:125 diskmapioctl(5a00,c0106477,ffff800020b4bab0,1,ffff800020abf680) at diskmapioctl+0x237 sys/dev/diskmap.c:106 VOP_IOCTL(fffffd806fa6f580,c0106477,ffff800020b4bab0,1,fffffd807f7c68a0,ffff800020abf680) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 vn_ioctl(fffffd807ce0ad10,c0106477,ffff800020b4bab0,ffff800020abf680) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 sys_ioctl(ffff800020abf680,ffff800020b4bbc8,ffff800020b4bc30) at sys_ioctl+0x5b8 syscall(ffff800020b4bca0) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800020b4bca0) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff1b,0,3,837dab491b0) at Xsyscall+0x128 end of kernel end trace frame: 0x83a011de800, count: -9 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800020b4b670 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800023190000 rax 0xffff800000b34c40 r8 0xffffffff8156e4e5 witness_checkorder+0xfd5 r9 0x5 r10 0x3 r11 0xe7641b10b2c8ef2b r12 0xfffffd80029b8c00 r13 0 r14 0xffffffff825d3f90 w_lodata+0x3ee80 r15 0xffffffff825e9540 w_lodata+0x54430 rip 0xffffffff819f49b8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020b4b660 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=136808 stat=onproc flags process=1000 proc=4080000 pri=32, usrpri=80, nice=20 forw=0xffffffffffffffff, list=0xffff800020abfb70,0xffff800020abe2d0 process=0xffff800020a8b890 user=0xffff800020b46000, vmspace=0xfffffd807f00c000 estcpu=30, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 2414 338291 75564 0 3 0x3000 suspend syz-executor.0 2414 190834 75564 0 7 0x4081080 syz-executor.0 2414 432261 75564 0 2 0x4081000 syz-executor.0 * 2414 136808 75564 0 7 0x4081000 syz-executor.0 2414 145647 75564 0 2 0x4081080 syz-executor.0 47317 228637 0 0 3 0x14200 acct acct 73195 44304 30404 0 3 0x82 piperd syz-executor.1 7272 193131 1 0 3 0x100083 ttyin getty 75564 518167 30404 0 3 0x82 nanosleep syz-executor.0 27932 256427 0 0 3 0x14200 bored sosplice 30404 513901 42769 0 3 0x82 thrsleep syz-fuzzer 30404 19463 42769 0 3 0x4000082 thrsleep syz-fuzzer 30404 276180 42769 0 3 0x4000082 thrsleep syz-fuzzer 30404 37166 42769 0 3 0x4000082 thrsleep syz-fuzzer 30404 346655 42769 0 3 0x4000082 thrsleep syz-fuzzer 30404 373897 42769 0 3 0x4000082 kqread syz-fuzzer 30404 81864 42769 0 3 0x4000082 thrsleep syz-fuzzer 30404 134312 42769 0 3 0x4000082 thrsleep syz-fuzzer 30404 34222 42769 0 3 0x4000082 thrsleep syz-fuzzer 30404 480740 42769 0 3 0x4000082 thrsleep syz-fuzzer 42769 316397 24128 0 3 0x10008a pause ksh 24128 440817 66758 0 3 0x92 select sshd 66758 518796 1 0 3 0x80 select sshd 59007 516489 4412 74 3 0x100092 bpf pflogd 4412 440716 1 0 3 0x80 netio pflogd 82719 211378 186 73 3 0x100090 kqread syslogd 186 239556 1 0 3 0x100082 netio syslogd 92450 115741 1 77 3 0x100090 poll dhclient 85352 290570 1 0 3 0x80 poll dhclient 17452 244602 0 0 3 0x14200 pgzero zerothread 33143 20058 0 0 3 0x14200 aiodoned aiodoned 14644 437960 0 0 3 0x14200 syncer update 32568 260122 0 0 3 0x14200 cleaner cleaner 2509 468079 0 0 3 0x14200 reaper reaper 31554 306559 0 0 3 0x14200 pgdaemon pagedaemon 74569 422363 0 0 3 0x14200 bored crynlk 27584 25996 0 0 3 0x14200 bored crypto 40094 156914 0 0 3 0x40014200 acpi0 acpi0 75469 441348 0 0 3 0x40014200 idle1 92029 66490 0 0 3 0x14200 bored softnet 72572 173449 0 0 3 0x14200 bored systqmp 80782 307248 0 0 3 0x14200 bored systq 39725 315658 0 0 3 0x40014200 bored softclock 78946 181182 0 0 3 0x40014200 idle0 16236 110121 0 0 3 0x14200 bored smr 1 508759 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 2414 (syz-executor.0) thread 0xffff800020abf680 (136808) exclusive rrwlock inode r = 0 (0xfffffd8067e2ed58) #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 (0xffffffff8261f770) #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 9637 6495K 14772K 78643K 29905 0 0 pcb 13 8K 8K 78643K 865 0 0 rtable 115 12K 13K 78643K 2499 0 0 ifaddr 96 20K 22K 78643K 927 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1837 0 0 iov 0 0K 24K 78643K 690 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1212 76K 77K 78643K 8374 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 9K 78643K 96 0 0 VM map 2 1K 1K 78643K 12 0 0 sem 12 0K 0K 78643K 806 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 5 13K 25K 78643K 7720 0 0 sigio 0 0K 0K 78643K 101 0 0 proc 54 51K 83K 78643K 2151 0 0 subproc 32 2K 2K 78643K 399 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 624 0 0 in_multi 33 2K 2K 78643K 472 0 0 ether_multi 1 0K 0K 78643K 30 0 0 mrt 1 0K 0K 78643K 20 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 120 530K 530K 78643K 120 0 0 exec 0 0K 1K 78643K 1107 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 106 21K 30K 78643K 25806 0 0 UVM aobj 130 5K 6K 78643K 140 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 917 0 0 NDP 24 0K 1K 78643K 282 0 0 temp 256 3557K 4197K 78643K 98950 0 0 kqueue 0 0K 0K 78643K 60 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 48 0 42 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 361 0 359 1 0 1 1 0 8 0 rtentry 112 283 0 239 3 1 2 2 0 8 0 unpcb 120 2401 0 2391 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 sackhl 24 3 0 3 2 2 0 1 0 8 0 tcpqe 32 8555 0 8555 2 2 0 2 0 8 0 tcpcb 544 1481 0 1477 1 0 1 1 0 8 0 inpcb 280 4374 0 4365 19 18 1 2 0 8 0 rttmr 72 3 0 3 3 3 0 1 0 8 0 nd6 48 69 0 63 2 1 1 1 0 8 0 pkpcb 40 25 0 25 12 11 1 1 0 8 1 swfcl 56 4 0 0 1 0 1 1 0 8 0 ppxss 1128 147 0 147 14 14 0 1 0 8 0 pffrag 232 15 0 15 8 8 0 1 0 482 0 pffrnode 88 15 0 15 8 8 0 1 0 8 0 pffrent 40 33 0 33 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 24 177 0 159 1 0 1 1 0 8 0 pfstkey 112 180 0 162 1 0 1 1 0 8 0 pfstate 328 180 0 162 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 1173 0 979 25 12 13 13 0 8 0 art_table 32 1174 0 979 3 1 2 2 0 8 0 art_node 16 278 0 238 1 0 1 1 0 8 0 sysvmsgpl 40 40 0 31 2 1 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 804 0 794 1 0 1 1 0 8 0 shmpl 112 138 0 10 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 13415 0 11973 47 0 47 47 0 8 0 ffsino 272 13415 0 11973 97 0 97 97 0 8 0 nchpl 144 24244 0 22613 62 0 62 62 0 8 0 uvmvnodes 72 5944 0 0 109 0 109 109 0 8 0 vnodes 200 5944 0 0 313 0 313 313 0 8 0 namei 1024 80580 0 80580 3 2 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vmpool 552 10 0 10 5 4 1 1 0 8 1 scsiplug 64 12 0 12 9 9 0 1 0 8 0 scxspl 192 71524 0 71524 34 31 3 7 0 8 3 plimitpl 152 715 0 707 1 0 1 1 0 8 0 sigapl 432 7871 0 7856 3 1 2 3 0 8 0 futexpl 56 98370 0 98368 1 0 1 1 0 8 0 knotepl 112 1668 0 1649 1 0 1 1 0 8 0 kqueuepl 104 1663 0 1661 1 0 1 1 0 8 0 pipepl 112 4258 0 4239 7 6 1 2 0 8 0 fdescpl 488 7872 0 7856 3 0 3 3 0 8 0 filepl 152 46987 0 46881 14 9 5 7 0 8 0 lockfpl 104 2606 0 2606 3 2 1 1 0 8 1 lockfspl 48 881 0 881 3 2 1 1 0 8 1 sessionpl 112 53 0 42 1 0 1 1 0 8 0 pgrppl 48 104 0 93 1 0 1 1 0 8 0 ucredpl 96 9406 0 9396 1 0 1 1 0 8 0 zombiepl 144 7859 0 7859 3 2 1 1 0 8 1 processpl 896 7892 0 7859 4 0 4 4 0 8 0 procpl 632 23886 0 23840 10 5 5 5 0 8 0 srpgc 64 45 0 45 19 19 0 1 0 8 0 sosppl 128 105 0 105 20 20 0 1 0 8 0 sockpl 384 7230 0 7211 13 10 3 4 0 8 1 mcl64k 65536 399 0 0 47 44 3 33 0 8 0 mcl16k 16384 9 0 0 2 0 2 2 0 8 0 mcl12k 12288 33 0 0 2 0 2 2 0 8 0 mcl9k 9216 41 0 0 3 2 1 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 17 0 0 3 0 3 3 0 8 0 mcl2k2 2112 16 0 0 2 0 2 2 0 8 0 mcl2k 2048 223 0 0 27 6 21 27 0 8 0 mtagpl 80 79 0 0 1 0 1 1 0 8 0 mbufpl 256 784 0 0 29 0 29 29 0 8 0 bufpl 256 22189 0 15170 439 0 439 439 0 8 0 anonpl 16 719302 0 706575 215 160 55 70 0 124 0 amapchunkpl 152 46675 0 46563 37 31 6 10 0 158 0 amappl16 192 39809 0 39086 203 165 38 49 0 8 0 amappl15 184 1527 0 1524 1 0 1 1 0 8 0 amappl14 176 932 0 927 1 0 1 1 0 8 0 amappl13 168 946 0 946 2 2 0 1 0 8 0 amappl12 160 987 0 985 1 0 1 1 0 8 0 amappl11 152 787 0 772 1 0 1 1 0 8 0 amappl10 144 1617 0 1612 1 0 1 1 0 8 0 amappl9 136 1486 0 1483 1 0 1 1 0 8 0 amappl8 128 1003 0 979 1 0 1 1 0 8 0 amappl7 120 1652 0 1642 1 0 1 1 0 8 0 amappl6 112 729 0 719 1 0 1 1 0 8 0 amappl5 104 1312 0 1299 1 0 1 1 0 8 0 amappl4 96 7276 0 7239 2 1 1 2 0 8 0 amappl3 88 1890 0 1880 1 0 1 1 0 8 0 amappl2 80 62814 0 62737 3 1 2 3 0 8 0 amappl1 72 178688 0 178258 25 15 10 19 0 8 0 amappl 80 24512 0 24472 2 1 1 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 64 139 0 10 3 0 3 3 0 8 0 uaddrrnd 24 7882 0 7856 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 7882 0 7856 1 0 1 1 0 8 0 vmmpekpl 168 61674 0 61634 3 1 2 2 0 8 0 vmmpepl 168 958289 0 956435 351 245 106 117 0 357 19 vmsppl 368 7871 0 7856 2 0 2 2 0 8 0 pdppl 4096 15771 0 15732 7 1 6 6 0 8 0 pvpl 32 1925215 0 1909232 402 246 156 174 0 265 22 pmappl 232 7881 0 7866 4 3 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 693 0 68 19 0 19 19 0 8 0