witness: lock order reversal: 1st 0xfffffd807cf525f8 inode (&ip->i_lock) 2nd 0xfffffd807cf51068 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(fffffd807cf51068,9,0) at witness_checkorder+0xffc witness_debugger sys/kern/subr_witness.c:2506 [inline] witness_checkorder(fffffd807cf51068,9,0) at witness_checkorder+0xffc sys/kern/subr_witness.c:1086 rw_enter_write(fffffd807cf51058) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:125 diskmapioctl(5a00,c0106477,ffff800021b939f0,1,ffff800020abe290) at diskmapioctl+0x237 sys/dev/diskmap.c:106 VOP_IOCTL(fffffd806fa718a0,c0106477,ffff800021b939f0,1,fffffd807f7c69c0,ffff800020abe290) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 vn_ioctl(fffffd807a828850,c0106477,ffff800021b939f0,ffff800020abe290) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 sys_ioctl(ffff800020abe290,ffff800021b93b08,ffff800021b93b70) at sys_ioctl+0x5b8 syscall(ffff800021b93be0) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800021b93be0) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff1b,0,3,4197618a1b0) at Xsyscall+0x128 end of kernel end trace frame: 0x41c3eedeaf0, count: -9 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800021b935b0 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800022366000 rax 0xffff800000a46d40 r8 0xffffffff81ca8c05 witness_checkorder+0xfd5 r9 0x5 r10 0x3 r11 0xafa34ee86bb9305 r12 0xfffffd80029b9c00 r13 0 r14 0xffffffff8260b310 w_lodata+0x45bd0 r15 0xffffffff82619a10 w_lodata+0x542d0 rip 0xffffffff81f62b28 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021b935a0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=88801 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff800020ac0c68,0xffff800020abec80 process=0xffff800020adca80 user=0xffff800021b8e000, vmspace=0xfffffd807f00c8a0 estcpu=31, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 38873 70878 56907 0 7 0 syz-executor.0 38873 505696 56907 0 2 0x4000000 syz-executor.0 38873 413926 56907 0 2 0x4000000 syz-executor.0 *38873 88801 56907 0 7 0x4000000 syz-executor.0 38873 62891 56907 0 2 0x4000000 syz-executor.0 56907 165019 9266 0 3 0x82 nanosleep syz-executor.0 79615 132055 1 0 3 0x100083 ttyin getty 8821 61757 0 0 3 0x14200 acct acct 62096 514513 9266 0 3 0x82 piperd syz-executor.1 74912 418070 0 0 3 0x14200 bored sosplice 9266 167622 39295 0 3 0x82 thrsleep syz-fuzzer 9266 417065 39295 0 3 0x4000082 thrsleep syz-fuzzer 9266 292917 39295 0 3 0x4000082 thrsleep syz-fuzzer 9266 236581 39295 0 3 0x4000082 thrsleep syz-fuzzer 9266 459501 39295 0 3 0x4000082 thrsleep syz-fuzzer 9266 425246 39295 0 3 0x4000082 thrsleep syz-fuzzer 9266 66913 39295 0 3 0x4000082 thrsleep syz-fuzzer 9266 260459 39295 0 3 0x4000082 thrsleep syz-fuzzer 9266 47944 39295 0 3 0x4000082 thrsleep syz-fuzzer 9266 334119 39295 0 3 0x4000082 kqread syz-fuzzer 39295 134049 60267 0 3 0x10008a pause ksh 60267 21252 48529 0 3 0x92 select sshd 48529 404936 1 0 3 0x80 select sshd 75884 306497 46762 74 3 0x100092 bpf pflogd 46762 17955 1 0 3 0x80 netio pflogd 67996 137777 30010 73 3 0x100090 kqread syslogd 30010 184895 1 0 3 0x100082 netio syslogd 83637 77124 1 77 3 0x100090 poll dhclient 94484 521989 1 0 3 0x80 poll dhclient 69392 32239 0 0 3 0x14200 pgzero zerothread 89781 24774 0 0 3 0x14200 aiodoned aiodoned 70385 26337 0 0 3 0x14200 syncer update 53997 166077 0 0 3 0x14200 cleaner cleaner 33453 374412 0 0 3 0x14200 reaper reaper 71999 187115 0 0 3 0x14200 pgdaemon pagedaemon 60893 183991 0 0 3 0x14200 bored crynlk 83898 112522 0 0 3 0x14200 bored crypto 94286 167010 0 0 3 0x40014200 acpi0 acpi0 20418 161963 0 0 3 0x40014200 idle1 19190 109369 0 0 3 0x14200 bored softnet 91016 270078 0 0 3 0x14200 bored systqmp 32968 468805 0 0 3 0x14200 bored systq 77192 103083 0 0 3 0x40014200 bored softclock 24880 373870 0 0 3 0x40014200 idle0 5952 204059 0 0 3 0x14200 bored smr 1 116608 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 38873 (syz-executor.0) thread 0xffff800020abe290 (88801) exclusive rrwlock inode r = 0 (0xfffffd807cf525f8) #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 (0xffffffff8266bbe8) #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 9536 6431K 7076K 78643K 14186 0 0 pcb 13 8K 8K 78643K 115 0 0 rtable 112 4K 5K 78643K 548 0 0 ifaddr 62 14K 14K 78643K 161 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1531 0 0 iov 0 0K 16K 78643K 110 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1219 77K 77K 78643K 2503 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 25 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 1K 78643K 136 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 5 13K 25K 78643K 1426 0 0 sigio 0 0K 0K 78643K 22 0 0 proc 54 51K 83K 78643K 739 0 0 subproc 32 2K 2K 78643K 102 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 119 0 0 in_multi 33 2K 2K 78643K 128 0 0 ether_multi 1 0K 0K 78643K 12 0 0 mrt 0 0K 0K 78643K 5 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 346 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 99 21K 30K 78643K 5357 0 0 UVM aobj 69 3K 3K 78643K 77 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 101 0 0 NDP 13 0K 0K 78643K 47 0 0 temp 179 3555K 4185K 78643K 9563 0 0 kqueue 0 0K 0K 78643K 20 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 15 0 9 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 88 0 86 1 0 1 1 0 8 0 rtentry 112 91 0 47 2 0 2 2 0 8 0 unpcb 120 429 0 419 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 sackhl 24 4 0 4 2 2 0 1 0 8 0 tcpqe 32 10084 0 10084 1 1 0 1 0 8 0 tcpcb 544 271 0 267 1 0 1 1 0 8 0 inpcb 280 738 0 731 2 1 1 2 0 8 0 nd6 48 18 0 12 1 0 1 1 0 8 0 pkpcb 40 4 0 4 2 2 0 1 0 8 0 ppxss 1128 17 0 17 4 3 1 1 0 8 1 pffrag 232 2 0 2 2 2 0 1 0 482 0 pffrnode 88 2 0 2 2 2 0 1 0 8 0 pffrent 40 4 0 4 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 48 0 29 1 0 1 1 0 8 0 pfstkey 112 48 0 29 1 0 1 1 0 8 0 pfstate 328 48 0 29 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 256 368 0 177 12 0 12 12 0 8 0 art_table 32 369 0 177 2 0 2 2 0 8 0 art_node 16 89 0 49 1 0 1 1 0 8 0 sysvmsgpl 40 24 0 10 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 132 0 122 1 0 1 1 0 8 0 shmpl 112 75 0 8 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 3557 0 2136 47 0 47 47 0 8 0 ffsino 272 3557 0 2136 96 0 96 96 0 8 0 nchpl 144 5731 0 4096 62 0 62 62 0 8 0 uvmvnodes 72 4533 0 0 83 0 83 83 0 8 0 vnodes 200 4533 0 0 239 0 239 239 0 8 0 namei 1024 18023 0 18023 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 15909 0 15909 14 13 1 7 0 8 1 plimitpl 152 134 0 126 1 0 1 1 0 8 0 sigapl 432 1615 0 1600 3 1 2 3 0 8 0 futexpl 56 18044 0 18044 1 0 1 1 0 8 1 knotepl 112 354 0 335 1 0 1 1 0 8 0 kqueuepl 104 310 0 308 1 0 1 1 0 8 0 pipepl 112 920 0 901 5 3 2 2 0 8 1 fdescpl 488 1616 0 1600 3 0 3 3 0 8 0 filepl 152 9234 0 9128 13 6 7 7 0 8 2 lockfpl 104 496 0 496 3 2 1 1 0 8 1 lockfspl 48 166 0 166 3 2 1 1 0 8 1 sessionpl 112 23 0 12 1 0 1 1 0 8 0 pgrppl 48 35 0 24 1 0 1 1 0 8 0 ucredpl 96 1579 0 1570 1 0 1 1 0 8 0 zombiepl 144 1601 0 1601 2 1 1 1 0 8 1 processpl 896 1634 0 1601 4 0 4 4 0 8 0 procpl 632 4376 0 4330 6 1 5 5 0 8 1 srpgc 64 8 0 8 4 4 0 1 0 8 0 sosppl 128 27 0 27 5 4 1 1 0 8 1 sockpl 384 1271 0 1252 7 3 4 4 0 8 2 mcl64k 65536 8 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 10 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 16 0 0 2 0 2 2 0 8 0 mcl2k2 2112 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 182 0 0 22 2 20 22 0 8 0 mtagpl 80 23 0 0 1 0 1 1 0 8 0 mbufpl 256 267 0 0 13 0 13 13 0 8 0 bufpl 256 9514 0 2495 439 0 439 439 0 8 0 anonpl 16 169325 0 157434 92 28 64 67 0 124 10 amapchunkpl 152 9512 0 9399 25 17 8 10 0 158 3 amappl16 192 7558 0 6873 74 31 43 47 0 8 8 amappl15 184 630 0 629 1 0 1 1 0 8 0 amappl14 176 725 0 717 1 0 1 1 0 8 0 amappl13 168 228 0 228 2 2 0 1 0 8 0 amappl12 160 58 0 58 2 2 0 1 0 8 0 amappl11 152 150 0 133 1 0 1 1 0 8 0 amappl10 144 84 0 81 1 0 1 1 0 8 0 amappl9 136 1013 0 1010 1 0 1 1 0 8 0 amappl8 128 541 0 524 1 0 1 1 0 8 0 amappl7 120 55 0 48 1 0 1 1 0 8 0 amappl6 112 132 0 123 1 0 1 1 0 8 0 amappl5 104 236 0 222 1 0 1 1 0 8 0 amappl4 96 1929 0 1897 2 1 1 2 0 8 0 amappl3 88 284 0 272 1 0 1 1 0 8 0 amappl2 80 12403 0 12327 3 1 2 3 0 8 0 amappl1 72 43782 0 43341 25 15 10 19 0 8 0 amappl 80 4702 0 4662 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 76 0 8 2 0 2 2 0 8 0 uaddrrnd 24 1616 0 1600 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1616 0 1600 1 0 1 1 0 8 0 vmmpekpl 168 15681 0 15644 2 0 2 2 0 8 0 vmmpepl 168 201351 0 199532 168 69 99 103 0 357 15 vmsppl 368 1615 0 1600 2 0 2 2 0 8 0 pdppl 4096 3239 0 3200 7 1 6 6 0 8 1 pvpl 32 459081 0 443955 208 50 158 164 0 265 24 pmappl 232 1615 0 1600 2 1 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 607 0 7 18 0 18 18 0 8 0