witness: lock order reversal: 1st 0xfffffd8067776c58 inode (&ip->i_lock) 2nd 0xfffffd806e64abd8 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+0xd1 sys/kern/kern_rwlock.c:247 #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(fffffd806e64abd8,9,0) at witness_checkorder+0xffc witness_debugger sys/kern/subr_witness.c:2506 [inline] witness_checkorder(fffffd806e64abd8,9,0) at witness_checkorder+0xffc sys/kern/subr_witness.c:1086 rw_enter(fffffd806e64abc8,1) at rw_enter+0xd1 sys/kern/kern_rwlock.c:247 diskmapioctl(5a00,c0106477,ffff800022d61790,1,ffff800020abec70) at diskmapioctl+0x237 sys/dev/diskmap.c:106 VOP_IOCTL(fffffd806fa7a3f0,c0106477,ffff800022d61790,1,fffffd807f7c6a80,ffff800020abec70) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8067a17dc0,c0106477,ffff800022d61790,ffff800020abec70) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 sys_ioctl(ffff800020abec70,ffff800022d618a8,ffff800022d61910) at sys_ioctl+0x5b8 syscall(ffff800022d61980) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800022d61980) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff1b,0,3,755db606010) at Xsyscall+0x128 end of kernel end trace frame: 0x7583b239c00, count: -9 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800022d612d0 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800023988000 rax 0xffff800000a8bd00 r8 0xffffffff8156e4e5 witness_checkorder+0xfd5 r9 0x5 r10 0x3 r11 0xaa596c4e6cc565af r12 0xfffffd80029b8c00 r13 0 r14 0xffffffff825da080 w_lodata+0x44f70 r15 0xffffffff825e9800 w_lodata+0x546f0 rip 0xffffffff819f49b8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800022d612c0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=159322 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff800020abeee8,0xffff800020abf3e8 process=0xffff800020adc000 user=0xffff800022d5c000, vmspace=0xfffffd807f00ca10 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 86259 488248 78938 0 2 0 syz-executor.1 86259 326339 78938 0 3 0x4000080 ttyout syz-executor.1 86259 52085 78938 0 7 0x4000000 syz-executor.1 25400 268828 21611 0 2 0 syz-executor.0 *25400 159322 21611 0 7 0x4000000 syz-executor.0 25400 497249 21611 0 3 0x4000080 fsleep syz-executor.0 25400 127304 21611 0 3 0x4000000 inode syz-executor.0 21611 246498 39757 0 3 0x82 nanosleep syz-executor.0 78938 337117 39757 0 3 0x82 nanosleep syz-executor.1 91942 282010 0 0 3 0x14200 bored sosplice 39757 392614 35318 0 3 0x82 kqread syz-fuzzer 39757 522394 35318 0 3 0x4000082 nanosleep syz-fuzzer 39757 158412 35318 0 3 0x4000082 thrsleep syz-fuzzer 39757 84964 35318 0 3 0x4000082 thrsleep syz-fuzzer 39757 208213 35318 0 3 0x4000082 thrsleep syz-fuzzer 39757 34624 35318 0 3 0x4000082 thrsleep syz-fuzzer 39757 444295 35318 0 3 0x4000082 thrsleep syz-fuzzer 39757 299766 35318 0 3 0x4000082 thrsleep syz-fuzzer 39757 376209 35318 0 3 0x4000082 thrsleep syz-fuzzer 39757 101010 35318 0 3 0x4000082 thrsleep syz-fuzzer 35318 208190 18926 0 3 0x10008a pause ksh 18926 168508 33272 0 3 0x92 select sshd 78791 495359 1 0 3 0x100083 ttyin getty 33272 423046 1 0 3 0x80 select sshd 70891 152833 52671 74 3 0x100092 bpf pflogd 52671 93092 1 0 3 0x80 netio pflogd 57936 265220 43719 73 3 0x100090 kqread syslogd 43719 366408 1 0 3 0x100082 netio syslogd 7808 385753 1 77 3 0x100090 poll dhclient 35134 509201 1 0 3 0x80 poll dhclient 51573 321132 0 0 2 0x14200 zerothread 75350 487852 0 0 3 0x14200 aiodoned aiodoned 20881 290207 0 0 3 0x14200 syncer update 7758 487997 0 0 3 0x14200 cleaner cleaner 45832 241017 0 0 3 0x14200 reaper reaper 56664 55364 0 0 3 0x14200 pgdaemon pagedaemon 45871 127066 0 0 3 0x14200 bored crynlk 89322 308648 0 0 3 0x14200 bored crypto 2224 413109 0 0 3 0x40014200 acpi0 acpi0 68145 455452 0 0 3 0x40014200 idle1 26455 45325 0 0 3 0x14200 bored softnet 57149 76013 0 0 3 0x14200 bored systqmp 91358 27709 0 0 3 0x14200 bored systq 85407 67597 0 0 3 0x40014200 bored softclock 31482 112027 0 0 3 0x40014200 idle0 3467 229580 0 0 3 0x14200 bored smr 1 170358 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 86259 (syz-executor.1) thread 0xffff800020abe9f8 (52085) exclusive rrwlock inode r = 0 (0xfffffd807ec53f78) #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 vfs_lookup+0xec sys/kern/vfs_lookup.c:418 #6 namei+0x61c sys/kern/vfs_lookup.c:248 #7 vn_open+0xb8 sys/kern/vfs_vnops.c:137 #8 doopenat+0x28e sys/kern/vfs_syscalls.c:1157 #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 Process 25400 (syz-executor.0) thread 0xffff800020abec70 (159322) exclusive rrwlock inode r = 0 (0xfffffd8067776c58) #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 Process 25400 (syz-executor.0) thread 0xffff800020abfb40 (127304) exclusive rwlock fdlock r = 0 (0xfffffd806e64abd8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 ptmioctl+0xe7 sys/kern/tty_pty.c:1071 #2 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 #3 vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 #4 sys_ioctl+0x5b8 #5 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #5 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #6 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9551 6454K 7775K 78643K 15157 0 0 pcb 13 8K 8K 78643K 211 0 0 rtable 89 4K 4K 78643K 861 0 0 ifaddr 63 14K 16K 78643K 323 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1565 0 0 iov 0 0K 28K 78643K 182 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1207 76K 77K 78643K 2968 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 21 0 0 VM map 2 1K 1K 78643K 4 0 0 sem 12 0K 1K 78643K 253 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 6 17K 25K 78643K 1979 0 0 sigio 0 0K 0K 78643K 20 0 0 proc 54 51K 83K 78643K 821 0 0 subproc 32 2K 2K 78643K 136 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 199 0 0 in_multi 22 1K 2K 78643K 178 0 0 ether_multi 1 0K 0K 78643K 15 0 0 mrt 0 0K 0K 78643K 1 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 84 371K 371K 78643K 84 0 0 exec 0 0K 1K 78643K 464 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 116 22K 31K 78643K 7265 0 0 UVM aobj 83 5K 5K 78643K 89 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 214 0 0 NDP 14 0K 0K 78643K 94 0 0 temp 186 3556K 4191K 78643K 30360 0 0 kqueue 0 0K 0K 78643K 15 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 18 0 14 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 81 0 79 1 0 1 1 0 8 0 rtentry 112 111 0 78 3 1 2 2 0 8 0 unpcb 120 653 0 643 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 8118 0 8118 2 2 0 2 0 8 0 tcpcb 544 428 0 424 1 0 1 1 0 8 0 inpcb 280 1141 0 1134 3 2 1 2 0 8 0 ip6q 72 1 0 1 1 1 0 1 0 8 0 ip6af 48 2 0 2 1 1 0 1 0 8 0 nd6 48 24 0 21 1 0 1 1 0 8 0 pkpcb 40 9 0 9 5 5 0 1 0 8 0 swfcl 56 2 0 0 1 0 1 1 0 8 0 ppxss 1128 44 0 44 5 4 1 1 0 8 1 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 79 0 50 1 0 1 1 0 8 0 pfstkey 112 80 0 51 2 0 2 2 0 8 0 pfstate 328 80 0 51 3 0 3 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 256 469 0 321 17 5 12 13 0 8 0 art_table 32 470 0 321 2 0 2 2 0 8 0 art_node 16 110 0 80 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 12 1 0 1 1 0 8 0 semupl 112 3 0 3 2 2 0 1 0 8 0 semapl 112 251 0 241 1 0 1 1 0 8 0 shmpl 112 87 0 6 3 0 3 3 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 4501 0 3085 47 0 47 47 0 8 0 ffsino 272 4501 0 3085 96 0 96 96 0 8 0 nchpl 144 7442 0 5811 62 0 62 62 0 8 0 uvmvnodes 72 5740 0 0 105 0 105 105 0 8 0 vnodes 200 5740 0 0 303 0 303 303 0 8 0 namei 1024 23292 0 23290 2 1 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 vmpool 552 2 0 2 1 1 0 1 0 8 0 scsiplug 64 2 0 2 1 1 0 1 0 8 0 scxspl 192 20220 0 20220 9 8 1 6 0 8 1 plimitpl 152 167 0 159 1 0 1 1 0 8 0 sigapl 432 2161 0 2145 3 1 2 3 0 8 0 futexpl 56 24834 0 24833 1 0 1 1 0 8 0 knotepl 112 479 0 460 1 0 1 1 0 8 0 kqueuepl 104 406 0 404 1 0 1 1 0 8 0 pipepl 112 1348 0 1329 4 3 1 2 0 8 0 fdescpl 488 2162 0 2145 3 0 3 3 0 8 0 filepl 152 12519 0 12413 9 4 5 6 0 8 0 lockfpl 104 606 0 606 3 2 1 1 0 8 1 lockfspl 48 204 0 204 3 2 1 1 0 8 1 sessionpl 112 24 0 13 1 0 1 1 0 8 0 pgrppl 48 30 0 19 1 0 1 1 0 8 0 ucredpl 96 2155 0 2146 1 0 1 1 0 8 0 zombiepl 144 2145 0 2145 2 1 1 1 0 8 1 processpl 896 2178 0 2145 4 0 4 4 0 8 0 procpl 632 6190 0 6143 10 6 4 5 0 8 0 srpgc 64 14 0 14 6 6 0 1 0 8 0 sosppl 128 38 0 38 7 7 0 1 0 8 0 sockpl 384 1901 0 1882 6 3 3 4 0 8 1 mcl64k 65536 16 0 0 2 0 2 2 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 7 0 0 1 0 1 1 0 8 0 mcl8k 8192 8 0 0 1 0 1 1 0 8 0 mcl4k 4096 13 0 0 2 0 2 2 0 8 0 mcl2k2 2112 8 0 0 1 0 1 1 0 8 0 mcl2k 2048 202 0 0 25 1 24 25 0 8 0 mtagpl 80 26 0 0 1 0 1 1 0 8 0 mbufpl 256 253 0 0 14 0 14 14 0 8 0 bufpl 256 10918 0 3899 439 0 439 439 0 8 0 anonpl 16 213664 0 200828 110 42 68 68 0 124 13 amapchunkpl 152 13444 0 13332 30 22 8 18 0 158 2 amappl16 192 10415 0 9693 88 43 45 49 0 8 8 amappl15 184 983 0 981 1 0 1 1 0 8 0 amappl14 176 174 0 169 1 0 1 1 0 8 0 amappl13 168 59 0 59 3 3 0 1 0 8 0 amappl12 160 386 0 384 1 0 1 1 0 8 0 amappl11 152 81 0 66 1 0 1 1 0 8 0 amappl10 144 288 0 280 1 0 1 1 0 8 0 amappl9 136 949 0 946 1 0 1 1 0 8 0 amappl8 128 490 0 459 2 0 2 2 0 8 0 amappl7 120 273 0 263 1 0 1 1 0 8 0 amappl6 112 66 0 55 1 0 1 1 0 8 0 amappl5 104 550 0 535 1 0 1 1 0 8 0 amappl4 96 2494 0 2464 2 1 1 2 0 8 0 amappl3 88 236 0 224 1 0 1 1 0 8 0 amappl2 80 16873 0 16793 3 1 2 3 0 8 0 amappl1 72 56044 0 55573 26 16 10 20 0 8 0 amappl 80 6545 0 6504 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 88 0 6 2 0 2 2 0 8 0 uaddrrnd 24 2164 0 2145 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2164 0 2145 1 0 1 1 0 8 0 vmmpekpl 168 20175 0 20141 2 0 2 2 0 8 0 vmmpepl 168 268988 0 266990 200 104 96 108 0 357 9 vmsppl 368 2161 0 2145 2 0 2 2 0 8 0 pdppl 4096 4335 0 4294 7 1 6 6 0 8 0 pvpl 32 591190 0 575049 255 88 167 167 0 265 34 pmappl 232 2163 0 2147 2 1 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 617 0 11 18 0 18 18 0 8 0