witness: lock order reversal: 1st 0xfffffd8065d952b8 inode (&ip->i_lock) 2nd 0xfffffd806e664438 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(fffffd806e664438,9,0) at witness_checkorder+0xffc witness_debugger sys/kern/subr_witness.c:2506 [inline] witness_checkorder(fffffd806e664438,9,0) at witness_checkorder+0xffc sys/kern/subr_witness.c:1086 rw_enter_write(fffffd806e664428) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:125 diskmapioctl(5a00,c0106477,ffff800022f96e90,1,ffff800020abef28) at diskmapioctl+0x237 sys/dev/diskmap.c:106 VOP_IOCTL(fffffd806fa7c710,c0106477,ffff800022f96e90,1,fffffd807f7c6960,ffff800020abef28) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8067c45e58,c0106477,ffff800022f96e90,ffff800020abef28) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 sys_ioctl(ffff800020abef28,ffff800022f96fa8,ffff800022f97010) at sys_ioctl+0x5b8 syscall(ffff800022f97080) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800022f97080) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff1b,0,3,5869b7cc1b0) at Xsyscall+0x128 end of kernel end trace frame: 0x588e2b92a70, count: -9 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800022f96a50 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800023bc0000 rax 0xffff800000b01c40 r8 0xffffffff8157a035 witness_checkorder+0xfd5 r9 0x5 r10 0x3 r11 0x4b8703d3cf2e6c6d r12 0xfffffd80029bac00 r13 0 r14 0xffffffff825a9270 w_lodata+0x3c8b0 r15 0xffffffff825c0ea0 w_lodata+0x544e0 rip 0xffffffff810d7398 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800022f96a40 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=234598 stat=onproc flags process=1000 proc=4080000 pri=32, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff800020abe7c0,0xffff800020abf1b0 process=0xffff800020a8ae10 user=0xffff800022f92000, vmspace=0xfffffd807f00b2e0 estcpu=29, cpticks=0, pctcpu=0.1 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 861 219400 68721 0 3 0x3000 suspend syz-executor.1 861 421882 68721 0 7 0x4081080 syz-executor.1 861 175333 68721 0 2 0x4081000 syz-executor.1 * 861 234598 68721 0 7 0x4081000 syz-executor.1 861 223949 68721 0 2 0x4081080 syz-executor.1 68721 335731 50147 0 3 0x82 nanosleep syz-executor.1 3920 15129 50147 0 3 0x82 piperd syz-executor.0 82934 236385 1 0 3 0x100083 ttyin getty 28469 256271 0 0 3 0x14200 acct acct 17870 244796 0 0 3 0x14200 bored sosplice 50147 31383 89143 0 3 0x82 thrsleep syz-fuzzer 50147 307372 89143 0 3 0x4000082 thrsleep syz-fuzzer 50147 268498 89143 0 3 0x4000082 thrsleep syz-fuzzer 50147 496746 89143 0 3 0x4000082 thrsleep syz-fuzzer 50147 241613 89143 0 3 0x4000082 thrsleep syz-fuzzer 50147 442663 89143 0 3 0x4000082 kqread syz-fuzzer 50147 479949 89143 0 3 0x4000082 thrsleep syz-fuzzer 50147 237074 89143 0 3 0x4000082 thrsleep syz-fuzzer 50147 162162 89143 0 3 0x4000082 thrsleep syz-fuzzer 50147 378616 89143 0 3 0x4000082 thrsleep syz-fuzzer 89143 338257 10465 0 3 0x10008a pause ksh 10465 361031 52126 0 3 0x92 select sshd 52126 38207 1 0 3 0x80 select sshd 24602 99984 58849 74 3 0x100092 bpf pflogd 58849 492845 1 0 3 0x80 netio pflogd 46118 202033 5918 73 3 0x100090 kqread syslogd 5918 243909 1 0 3 0x100082 netio syslogd 5692 419856 1 77 3 0x100090 poll dhclient 91066 301001 1 0 3 0x80 poll dhclient 14814 499554 0 0 3 0x14200 pgzero zerothread 83744 367787 0 0 3 0x14200 aiodoned aiodoned 22604 114217 0 0 3 0x14200 syncer update 29823 138452 0 0 3 0x14200 cleaner cleaner 16191 135174 0 0 3 0x14200 reaper reaper 47210 2594 0 0 3 0x14200 pgdaemon pagedaemon 44903 509814 0 0 3 0x14200 bored crynlk 80714 91385 0 0 3 0x14200 bored crypto 96688 348451 0 0 3 0x40014200 acpi0 acpi0 26528 280866 0 0 3 0x40014200 idle1 3476 188247 0 0 3 0x14200 bored softnet 25473 298324 0 0 3 0x14200 bored systqmp 9807 395862 0 0 3 0x14200 bored systq 68040 200043 0 0 3 0x40014200 bored softclock 55219 462234 0 0 3 0x40014200 idle0 30955 422044 0 0 3 0x14200 bored smr 1 463596 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 861 (syz-executor.1) thread 0xffff800020abef28 (234598) exclusive rrwlock inode r = 0 (0xfffffd8065d952b8) #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 (0xffffffff8262ca18) #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 9596 7097K 15038K 78643K 31730 0 0 pcb 13 8K 8K 78643K 628 0 0 rtable 115 4K 5K 78643K 3303 0 0 ifaddr 80 23K 27K 78643K 1067 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1911 0 0 iov 0 0K 32K 78643K 855 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1204 76K 77K 78643K 9681 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 107 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 1K 78643K 1199 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 5 13K 25K 78643K 9371 0 0 sigio 0 0K 0K 78643K 157 0 0 proc 54 51K 71K 78643K 2684 0 0 subproc 32 2K 2K 78643K 665 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 786 0 0 in_multi 33 2K 2K 78643K 733 0 0 ether_multi 1 0K 0K 78643K 39 0 0 mrt 0 0K 0K 78643K 15 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 114 503K 503K 78643K 114 0 0 exec 0 0K 1K 78643K 1312 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 122 22K 31K 78643K 30562 0 0 UVM aobj 130 4K 4K 78643K 139 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 569 0 0 NDP 19 0K 1K 78643K 341 0 0 temp 221 3556K 4196K 78643K 127219 0 0 kqueue 0 0K 0K 78643K 70 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 82 0 76 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 401 0 399 1 0 1 1 0 8 0 rtentry 112 472 0 428 4 2 2 2 0 8 0 unpcb 120 2772 0 2762 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 10381 0 10381 2 2 0 1 0 8 0 tcpcb 544 1431 0 1427 1 0 1 1 0 8 0 inpcb 280 4045 0 4038 4 3 1 2 0 8 0 rttmr 72 3 0 3 3 3 0 1 0 8 0 ip6q 72 1 0 1 1 1 0 1 0 8 0 ip6af 48 1 0 1 1 1 0 1 0 8 0 nd6 48 117 0 111 1 0 1 1 0 8 0 pkpcb 40 33 0 33 12 11 1 1 0 8 1 swfcl 56 4 0 0 1 0 1 1 0 8 0 ppxss 1128 160 0 160 21 20 1 1 0 8 1 pffrag 232 15 0 15 9 9 0 1 0 482 0 pffrnode 88 15 0 15 9 9 0 1 0 8 0 pffrent 40 35 0 35 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 24 195 0 164 1 0 1 1 0 8 0 pfstkey 112 196 0 165 1 0 1 1 0 8 0 pfstate 328 196 0 165 5 2 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 1936 0 1738 24 11 13 13 0 8 0 art_table 32 1937 0 1738 2 0 2 2 0 8 0 art_node 16 456 0 416 1 0 1 1 0 8 0 sysvmsgpl 40 21 0 15 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 1197 0 1187 1 0 1 1 0 8 0 shmpl 112 137 0 9 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 16148 0 14654 49 0 49 49 0 8 0 ffsino 272 16148 0 14654 100 0 100 100 0 8 0 nchpl 144 29153 0 27520 62 0 62 62 0 8 0 uvmvnodes 72 6121 0 0 112 0 112 112 0 8 0 vnodes 200 6121 0 0 323 0 323 323 0 8 0 namei 1024 95202 0 95202 4 3 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 24 0 24 13 13 0 1 0 8 0 scxspl 192 84959 0 84959 41 37 4 7 0 8 4 plimitpl 152 782 0 774 1 0 1 1 0 8 0 sigapl 432 9469 0 9454 3 1 2 3 0 8 0 futexpl 56 109885 0 109883 3 2 1 1 0 8 0 knotepl 112 2052 0 2033 1 0 1 1 0 8 0 kqueuepl 104 1677 0 1675 1 0 1 1 0 8 0 pipepl 112 5084 0 5065 13 12 1 2 0 8 0 fdescpl 488 9470 0 9454 3 0 3 3 0 8 0 filepl 152 52980 0 52874 20 15 5 7 0 8 0 lockfpl 104 3517 0 3517 4 3 1 1 0 8 1 lockfspl 48 1152 0 1152 4 3 1 1 0 8 1 sessionpl 112 64 0 53 1 0 1 1 0 8 0 pgrppl 48 142 0 131 1 0 1 1 0 8 0 ucredpl 96 9468 0 9459 1 0 1 1 0 8 0 zombiepl 144 9458 0 9458 3 2 1 1 0 8 1 processpl 896 9491 0 9458 4 0 4 4 0 8 0 procpl 632 27963 0 27917 12 7 5 5 0 8 0 srpgc 64 77 0 77 21 21 0 1 0 8 0 sosppl 128 91 0 91 24 23 1 1 0 8 1 sockpl 384 7327 0 7308 15 12 3 4 0 8 1 mcl64k 65536 269 0 0 33 30 3 33 0 8 0 mcl16k 16384 13 0 0 2 0 2 2 0 8 0 mcl12k 12288 28 0 0 2 0 2 2 0 8 0 mcl9k 9216 33 0 0 3 1 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 33 0 0 4 1 3 3 0 8 0 mcl2k2 2112 6 0 0 1 0 1 1 0 8 0 mcl2k 2048 220 0 0 22 7 15 22 0 8 0 mtagpl 80 63 0 0 1 0 1 1 0 8 0 mbufpl 256 649 0 0 23 4 19 23 0 8 0 bufpl 256 28039 0 21020 439 0 439 439 0 8 0 anonpl 16 838156 0 826377 217 160 57 67 0 124 2 amapchunkpl 152 56658 0 56546 66 56 10 10 0 158 4 amappl16 192 44849 0 44150 242 198 44 47 0 8 8 amappl15 184 897 0 896 1 0 1 1 0 8 0 amappl14 176 1421 0 1414 1 0 1 1 0 8 0 amappl13 168 1835 0 1833 7 6 1 1 0 8 0 amappl12 160 535 0 533 1 0 1 1 0 8 0 amappl11 152 1362 0 1347 1 0 1 1 0 8 0 amappl10 144 2509 0 2505 1 0 1 1 0 8 0 amappl9 136 2330 0 2326 1 0 1 1 0 8 0 amappl8 128 1785 0 1753 4 2 2 2 0 8 0 amappl7 120 2528 0 2518 1 0 1 1 0 8 0 amappl6 112 1288 0 1280 1 0 1 1 0 8 0 amappl5 104 930 0 915 1 0 1 1 0 8 0 amappl4 96 10304 0 10269 2 1 1 2 0 8 0 amappl3 88 1410 0 1400 1 0 1 1 0 8 0 amappl2 80 73364 0 73289 3 1 2 3 0 8 0 amappl1 72 210300 0 209850 27 17 10 20 0 8 0 amappl 80 28834 0 28794 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 64 138 0 9 3 0 3 3 0 8 0 uaddrrnd 24 9470 0 9454 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 9470 0 9454 1 0 1 1 0 8 0 vmmpekpl 168 69832 0 69796 2 0 2 2 0 8 0 vmmpepl 168 1148139 0 1146281 396 293 103 108 0 357 16 vmsppl 368 9469 0 9454 2 0 2 2 0 8 0 pdppl 4096 18947 0 18908 7 1 6 6 0 8 0 pvpl 32 2279029 0 2263984 437 294 143 168 0 265 9 pmappl 232 9469 0 9454 3 2 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 672 0 60 19 0 19 19 0 8 0