witness: lock order reversal: 1st 0xfffffd806ecf3b38 inode (&ip->i_lock) 2nd 0xfffffd807c50c250 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(fffffd807c50c250,9,0) at witness_checkorder+0xffc witness_debugger sys/kern/subr_witness.c:2506 [inline] witness_checkorder(fffffd807c50c250,9,0) at witness_checkorder+0xffc sys/kern/subr_witness.c:1086 rw_enter_write(fffffd807c50c240) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:125 diskmapioctl(5a00,c0106477,ffff800023789480,1,ffff800020acf190) at diskmapioctl+0x237 sys/dev/diskmap.c:106 VOP_IOCTL(fffffd806fa714b8,c0106477,ffff800023789480,1,fffffd807f7c6a80,ffff800020acf190) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8067c57b68,c0106477,ffff800023789480,ffff800020acf190) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 sys_ioctl(ffff800020acf190,ffff800023789598,ffff800023789600) at sys_ioctl+0x5b8 syscall(ffff800023789670) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800023789670) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff1b,0,3,33311ceb280) at Xsyscall+0x128 end of kernel end trace frame: 0x3360b88b300, count: -9 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800023789040 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800022d7e000 rax 0xffff800000ac36c0 r8 0xffffffff8187b235 witness_checkorder+0xfd5 r9 0x5 r10 0x3 r11 0x98920a4966d5ed6c r12 0xfffffd80029b6c00 r13 0 r14 0xffffffff825b71f0 w_lodata+0x41df0 r15 0xffffffff825c9990 w_lodata+0x54590 rip 0xffffffff81b977e8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800023789030 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=490519 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=80, nice=20 forw=0xffffffffffffffff, list=0xffff800020acf408,0xffff800020ace548 process=0xffff800020adce00 user=0xffff800023784000, vmspace=0xfffffd806e7aa458 estcpu=30, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 8612 181320 39914 0 2 0 syz-executor.1 8612 403533 39914 0 7 0x4000000 syz-executor.1 8612 521147 39914 0 2 0x4000000 syz-executor.1 8612 83975 39914 0 2 0x4000000 syz-executor.1 * 8612 490519 39914 0 7 0x4000000 syz-executor.1 8612 194928 39914 0 2 0x4000000 syz-executor.1 8612 55688 39914 0 2 0x4000000 syz-executor.1 39914 60911 7770 0 3 0x82 nanosleep syz-executor.1 30163 11147 0 0 3 0x14200 acct acct 71538 63838 7770 0 3 0x82 piperd syz-executor.0 2162 345277 1 0 3 0x100083 ttyin getty 9793 75391 0 0 3 0x14200 bored sosplice 7770 406814 56261 0 3 0x82 thrsleep syz-fuzzer 7770 475577 56261 0 3 0x4000082 thrsleep syz-fuzzer 7770 64099 56261 0 3 0x4000082 thrsleep syz-fuzzer 7770 78624 56261 0 3 0x4000082 thrsleep syz-fuzzer 7770 97852 56261 0 3 0x4000082 thrsleep syz-fuzzer 7770 10072 56261 0 3 0x4000082 thrsleep syz-fuzzer 7770 276006 56261 0 3 0x4000082 thrsleep syz-fuzzer 7770 59649 56261 0 3 0x4000082 thrsleep syz-fuzzer 7770 284161 56261 0 3 0x4000082 thrsleep syz-fuzzer 7770 136774 56261 0 3 0x4000082 kqread syz-fuzzer 56261 37887 15429 0 3 0x10008a pause ksh 15429 370672 7305 0 3 0x92 select sshd 7305 113386 1 0 3 0x80 select sshd 85231 469519 86929 74 3 0x100092 bpf pflogd 86929 430454 1 0 3 0x80 netio pflogd 89477 1303 67674 73 3 0x100090 kqread syslogd 67674 386418 1 0 3 0x100082 netio syslogd 81843 120119 1 77 3 0x100090 poll dhclient 32392 263119 1 0 3 0x80 poll dhclient 32724 209504 0 0 3 0x14200 pgzero zerothread 28871 129725 0 0 3 0x14200 aiodoned aiodoned 43571 429612 0 0 3 0x14200 syncer update 88989 489672 0 0 3 0x14200 cleaner cleaner 37042 18370 0 0 3 0x14200 reaper reaper 10580 367601 0 0 3 0x14200 pgdaemon pagedaemon 78182 432073 0 0 3 0x14200 bored crynlk 63414 136569 0 0 3 0x14200 bored crypto 84162 25699 0 0 3 0x40014200 acpi0 acpi0 76742 339506 0 0 3 0x40014200 idle1 34822 375692 0 0 3 0x14200 bored softnet 32216 362688 0 0 3 0x14200 bored systqmp 38356 139910 0 0 3 0x14200 bored systq 31393 511247 0 0 3 0x40014200 bored softclock 1698 499640 0 0 3 0x40014200 idle0 1303 148157 0 0 3 0x14200 bored smr 1 244125 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 8612 (syz-executor.1) thread 0xffff800020acf190 (490519) exclusive rrwlock inode r = 0 (0xfffffd806ecf3b38) #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 (0xffffffff826648e0) #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 9587 6460K 7222K 78643K 18681 0 0 pcb 13 8K 8K 78643K 271 0 0 rtable 111 4K 4K 78643K 1029 0 0 ifaddr 82 17K 18K 78643K 404 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1621 0 0 iov 0 0K 24K 78643K 294 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1210 76K 77K 78643K 4052 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 1K 78643K 316 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 5 13K 25K 78643K 3069 0 0 sigio 0 0K 0K 78643K 18 0 0 proc 54 51K 71K 78643K 950 0 0 subproc 32 2K 2K 78643K 140 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 285 0 0 in_multi 33 2K 2K 78643K 199 0 0 ether_multi 1 0K 0K 78643K 8 0 0 mrt 0 0K 0K 78643K 7 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 566 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 103 21K 30K 78643K 10612 0 0 UVM aobj 130 4K 4K 78643K 148 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 195 0 0 NDP 19 0K 0K 78643K 117 0 0 temp 221 3544K 3618K 78643K 32465 0 0 kqueue 0 0K 0K 78643K 25 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 13 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 129 0 127 1 0 1 1 0 8 0 rtentry 112 117 0 73 2 0 2 2 0 8 0 unpcb 120 870 0 860 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 10314 0 10314 3 3 0 2 0 8 0 tcpcb 544 512 0 508 1 0 1 1 0 8 0 inpcb 280 1495 0 1488 5 4 1 2 0 8 0 rttmr 72 1 0 1 1 1 0 1 0 8 0 nd6 48 24 0 18 1 0 1 1 0 8 0 pkpcb 40 17 0 17 8 8 0 1 0 8 0 swfcl 56 3 0 0 1 0 1 1 0 8 0 ppxss 1128 60 0 60 8 8 0 1 0 8 0 pffrag 232 8 0 8 6 5 1 1 0 482 1 pffrnode 88 8 0 8 6 5 1 1 0 8 1 pffrent 40 19 0 19 6 5 1 1 0 8 1 pfosfp 40 846 0 846 5 5 0 5 0 8 0 pfosfpen 112 1428 0 1428 21 21 0 21 0 8 0 pfstitem 24 85 0 60 1 0 1 1 0 8 0 pfstkey 112 85 0 60 2 0 2 2 0 8 0 pfstate 328 85 0 60 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 256 465 0 271 15 2 13 13 0 8 0 art_table 32 466 0 271 2 0 2 2 0 8 0 art_node 16 112 0 72 1 0 1 1 0 8 0 sysvmsgpl 40 22 0 7 1 0 1 1 0 8 0 semupl 112 3 0 3 1 1 0 1 0 8 0 semapl 112 314 0 304 1 0 1 1 0 8 0 shmpl 112 146 0 18 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 6226 0 4802 47 0 47 47 0 8 0 ffsino 272 6226 0 4802 96 0 96 96 0 8 0 nchpl 144 10695 0 9060 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 33731 0 33731 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 5 0 5 5 5 0 1 0 8 0 scxspl 192 30296 0 30296 17 16 1 7 0 8 1 plimitpl 152 278 0 270 1 0 1 1 0 8 0 sigapl 432 3252 0 3237 3 1 2 3 0 8 0 futexpl 56 38726 0 38726 1 0 1 1 0 8 1 knotepl 112 673 0 654 1 0 1 1 0 8 0 kqueuepl 104 689 0 687 1 0 1 1 0 8 0 pipepl 112 1854 0 1835 2 0 2 2 0 8 0 fdescpl 488 3253 0 3237 3 0 3 3 0 8 0 filepl 152 18649 0 18540 10 5 5 7 0 8 0 lockfpl 104 1013 0 1013 4 3 1 1 0 8 1 lockfspl 48 353 0 353 4 3 1 1 0 8 1 sessionpl 112 25 0 14 1 0 1 1 0 8 0 pgrppl 48 41 0 30 1 0 1 1 0 8 0 ucredpl 96 3271 0 3262 1 0 1 1 0 8 0 zombiepl 144 3237 0 3237 2 1 1 1 0 8 1 processpl 896 3270 0 3237 4 0 4 4 0 8 0 procpl 632 9514 0 9466 10 5 5 5 0 8 0 srpgc 64 13 0 13 6 6 0 1 0 8 0 sosppl 128 53 0 53 9 8 1 1 0 8 1 sockpl 384 2546 0 2527 6 3 3 4 0 8 1 mcl64k 65536 19 0 0 3 0 3 3 0 8 0 mcl16k 16384 11 0 0 2 0 2 2 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 19 0 0 3 0 3 3 0 8 0 mcl4k 4096 12 0 0 2 0 2 2 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 257 0 0 31 2 29 31 0 8 0 mtagpl 80 28 0 0 1 0 1 1 0 8 0 mbufpl 256 345 0 0 18 1 17 17 0 8 0 bufpl 256 14676 0 7657 439 0 439 439 0 8 0 anonpl 16 311941 0 299325 134 70 64 68 0 124 11 amapchunkpl 152 18851 0 18734 37 31 6 10 0 158 0 amappl16 192 16385 0 15673 128 88 40 48 0 8 4 amappl15 184 429 0 429 1 1 0 1 0 8 0 amappl14 176 518 0 513 1 0 1 1 0 8 0 amappl13 168 15 0 14 2 1 1 1 0 8 0 amappl12 160 542 0 540 4 3 1 1 0 8 0 amappl11 152 805 0 789 1 0 1 1 0 8 0 amappl10 144 111 0 107 1 0 1 1 0 8 0 amappl9 136 1690 0 1686 1 0 1 1 0 8 0 amappl8 128 1206 0 1185 1 0 1 1 0 8 0 amappl7 120 64 0 57 1 0 1 1 0 8 0 amappl6 112 791 0 781 1 0 1 1 0 8 0 amappl5 104 719 0 703 1 0 1 1 0 8 0 amappl4 96 3225 0 3195 2 1 1 2 0 8 0 amappl3 88 589 0 578 1 0 1 1 0 8 0 amappl2 80 25278 0 25204 3 1 2 3 0 8 0 amappl1 72 78214 0 77762 26 16 10 20 0 8 0 amappl 80 9877 0 9835 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 64 147 0 18 3 0 3 3 0 8 0 uaddrrnd 24 3253 0 3237 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3253 0 3237 1 0 1 1 0 8 0 vmmpekpl 168 26675 0 26634 3 1 2 3 0 8 0 vmmpepl 168 398463 0 396602 207 115 92 106 0 357 7 vmsppl 368 3252 0 3237 2 0 2 2 0 8 0 pdppl 4096 6513 0 6474 6 0 6 6 0 8 0 pvpl 32 821763 0 805878 283 122 161 167 0 265 29 pmappl 232 3252 0 3237 2 1 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 628 0 9 18 0 18 18 0 8 0