witness: lock order reversal: 1st 0xfffffd806e2f2b38 inode (&ip->i_lock) 2nd 0xfffffd80784a1bd8 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(fffffd80784a1bd8,9,0) at witness_checkorder+0xffc witness_debugger sys/kern/subr_witness.c:2506 [inline] witness_checkorder(fffffd80784a1bd8,9,0) at witness_checkorder+0xffc sys/kern/subr_witness.c:1086 rw_enter_write(fffffd80784a1bc8) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:125 diskmapioctl(5a00,c0106477,ffff8000231a5020,1,ffff800020ace7a8) at diskmapioctl+0x237 sys/dev/diskmap.c:106 VOP_IOCTL(fffffd806fa7e3f0,c0106477,ffff8000231a5020,1,fffffd807f7c6a80,ffff800020ace7a8) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 vn_ioctl(fffffd80759e7428,c0106477,ffff8000231a5020,ffff800020ace7a8) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 sys_ioctl(ffff800020ace7a8,ffff8000231a5138,ffff8000231a51a0) at sys_ioctl+0x5b8 syscall(ffff8000231a5210) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff8000231a5210) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff1b,0,3,8ebf7ff5010) at Xsyscall+0x128 end of kernel end trace frame: 0x8eeec9323f0, count: -9 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff8000231a4be0 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800020b4c000 rax 0xffff800000a91000 r8 0xffffffff8207c1f5 witness_checkorder+0xfd5 r9 0x5 r10 0x3 r11 0x69f594b82ef2e2e2 r12 0xfffffd80029b7c00 r13 0 r14 0xffffffff826011a0 w_lodata+0x3c8b0 r15 0xffffffff82618dd0 w_lodata+0x544e0 rip 0xffffffff810d9878 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000231a4bd0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=113381 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020ace530,0xffff800020ace2c8 process=0xffff800020adce00 user=0xffff8000231a0000, vmspace=0xfffffd807f00b8a0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 17118 260650 90054 0 2 0 syz-executor.1 17118 168624 90054 0 3 0x4000080 ttyout syz-executor.1 17118 298562 90054 0 3 0x4000080 fsleep syz-executor.1 83068 196126 87103 0 7 0 syz-executor.0 *83068 113381 87103 0 7 0x4000000 syz-executor.0 83068 414532 87103 0 2 0x4000000 syz-executor.0 90054 242660 35973 0 3 0x82 nanosleep syz-executor.1 87103 209596 35973 0 3 0x82 nanosleep syz-executor.0 41362 469304 1 0 3 0x100083 ttyopn getty 86940 459207 0 0 3 0x14200 acct acct 43364 137244 0 0 3 0x14200 bored sosplice 35973 14699 20336 0 3 0x82 thrsleep syz-fuzzer 35973 286916 20336 0 3 0x4000082 thrsleep syz-fuzzer 35973 281202 20336 0 3 0x4000082 thrsleep syz-fuzzer 35973 500822 20336 0 3 0x4000082 kqread syz-fuzzer 35973 133461 20336 0 3 0x4000082 thrsleep syz-fuzzer 35973 29654 20336 0 3 0x4000082 thrsleep syz-fuzzer 35973 253598 20336 0 3 0x4000082 thrsleep syz-fuzzer 35973 223293 20336 0 3 0x4000082 thrsleep syz-fuzzer 35973 302572 20336 0 3 0x4000082 thrsleep syz-fuzzer 35973 272389 20336 0 3 0x4000082 thrsleep syz-fuzzer 20336 70473 98075 0 3 0x10008a pause ksh 98075 482796 75352 0 3 0x92 select sshd 75352 395065 1 0 3 0x80 select sshd 71177 469284 95345 74 3 0x100092 bpf pflogd 95345 246915 1 0 3 0x80 netio pflogd 81393 319016 10535 73 3 0x100090 kqread syslogd 10535 292157 1 0 3 0x100082 netio syslogd 6219 11096 1 77 3 0x100090 poll dhclient 86182 436146 1 0 3 0x80 poll dhclient 18132 367072 0 0 2 0x14200 zerothread 49051 395762 0 0 3 0x14200 aiodoned aiodoned 10275 452569 0 0 3 0x14200 syncer update 84141 379230 0 0 3 0x14200 cleaner cleaner 20318 439447 0 0 3 0x14200 reaper reaper 63968 3315 0 0 3 0x14200 pgdaemon pagedaemon 82093 315845 0 0 3 0x14200 bored crynlk 94661 135493 0 0 3 0x14200 bored crypto 41449 496585 0 0 3 0x40014200 acpi0 acpi0 28377 430041 0 0 3 0x40014200 idle1 83912 418349 0 0 3 0x14200 bored softnet 796 522865 0 0 3 0x14200 bored systqmp 30050 358964 0 0 3 0x14200 bored systq 66849 215998 0 0 3 0x40014200 bored softclock 24356 145724 0 0 3 0x40014200 idle0 73224 412895 0 0 3 0x14200 bored smr 1 147819 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 83068 (syz-executor.0) thread 0xffff800020ace7a8 (113381) exclusive rrwlock inode r = 0 (0xfffffd806e2f2b38) #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 (0xffffffff8264be40) #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 9621 7106K 15308K 78643K 36553 0 0 pcb 13 8K 8K 78643K 1086 0 0 rtable 117 12K 13K 78643K 3246 0 0 ifaddr 90 24K 27K 78643K 1217 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1937 0 0 iov 0 0K 28K 78643K 1013 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1202 75K 77K 78643K 10635 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 131 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 1K 78643K 1200 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 6 17K 25K 78643K 10335 0 0 sigio 0 0K 0K 78643K 325 0 0 proc 54 51K 83K 78643K 2565 0 0 subproc 32 2K 2K 78643K 499 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 965 0 0 in_multi 33 2K 2K 78643K 649 0 0 ether_multi 1 0K 0K 78643K 39 0 0 mrt 3 0K 0K 78643K 38 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 132 583K 583K 78643K 132 0 0 exec 0 0K 1K 78643K 1424 0 0 pfkey data 0 0K 0K 78643K 4 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 105 21K 31K 78643K 34022 0 0 UVM aobj 130 8K 8K 78643K 146 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 997 0 0 NDP 22 0K 0K 78643K 371 0 0 temp 243 3557K 4197K 78643K 159054 0 0 kqueue 0 0K 0K 78643K 80 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 63 0 56 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 456 0 454 1 0 1 1 0 8 0 rtentry 112 362 0 317 5 3 2 2 0 8 0 unpcb 120 3298 0 3288 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 10144 0 10144 2 2 0 2 0 8 0 tcpcb 544 1954 0 1950 1 0 1 1 0 8 0 inpcb 280 5589 0 5581 12 10 2 2 0 8 1 rttmr 72 8 0 8 8 8 0 1 0 8 0 nd6 48 87 0 81 1 0 1 1 0 8 0 pkpcb 40 28 0 28 12 12 0 1 0 8 0 swfcl 56 7 0 0 1 0 1 1 0 8 0 ppxss 1128 205 0 205 33 32 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 36 0 36 10 10 0 1 0 8 0 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 24 244 0 227 1 0 1 1 0 8 0 pfstkey 112 244 0 227 1 0 1 1 0 8 0 pfstate 328 244 0 226 6 4 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 1511 0 1313 22 9 13 13 0 8 0 art_table 32 1512 0 1313 2 0 2 2 0 8 0 art_node 16 352 0 311 1 0 1 1 0 8 0 sysvmsgpl 40 24 0 16 1 0 1 1 0 8 0 semapl 112 1195 0 1185 1 0 1 1 0 8 0 shmpl 112 144 0 16 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 17429 0 15981 47 0 47 47 0 8 0 ffsino 272 17429 0 15981 97 0 97 97 0 8 0 nchpl 144 31868 0 30229 62 0 62 62 0 8 0 uvmvnodes 72 6883 0 0 126 0 126 126 0 8 0 vnodes 200 6883 0 0 363 0 363 363 0 8 0 namei 1024 103573 0 103573 6 5 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 22 0 22 13 13 0 1 0 8 0 scxspl 192 92482 0 92482 50 49 1 7 0 8 1 plimitpl 152 954 0 946 1 0 1 1 0 8 0 sigapl 432 10458 0 10442 3 1 2 3 0 8 0 futexpl 56 129162 0 129161 4 3 1 1 0 8 0 knotepl 112 2051 0 2032 2 1 1 2 0 8 0 kqueuepl 104 2092 0 2090 1 0 1 1 0 8 0 pipepl 112 6002 0 5983 8 7 1 2 0 8 0 fdescpl 488 10459 0 10442 3 0 3 3 0 8 0 filepl 152 61194 0 61091 19 14 5 7 0 8 0 lockfpl 104 3103 0 3102 11 10 1 1 0 8 0 lockfspl 48 1076 0 1075 11 10 1 1 0 8 0 sessionpl 112 49 0 38 1 0 1 1 0 8 0 pgrppl 48 121 0 110 1 0 1 1 0 8 0 ucredpl 96 11461 0 11452 1 0 1 1 0 8 0 zombiepl 144 10443 0 10443 4 3 1 1 0 8 1 processpl 896 10477 0 10443 4 0 4 4 0 8 0 procpl 632 31790 0 31743 9 4 5 5 0 8 0 srpgc 64 62 0 62 29 29 0 1 0 8 0 sosppl 128 92 0 92 29 29 0 1 0 8 0 sockpl 384 9466 0 9447 13 10 3 4 0 8 1 mcl64k 65536 269 0 0 34 31 3 34 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 34 0 0 2 0 2 2 0 8 0 mcl9k 9216 41 0 0 3 1 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 30 0 0 4 1 3 3 0 8 0 mcl2k2 2112 10 0 0 1 0 1 1 0 8 0 mcl2k 2048 241 0 0 27 11 16 27 0 8 0 mtagpl 80 71 0 0 1 0 1 1 0 8 0 mbufpl 256 679 0 0 23 7 16 21 0 8 0 bufpl 256 31255 0 24236 439 0 439 439 0 8 0 anonpl 16 978287 0 966414 243 178 65 69 0 124 6 amapchunkpl 152 63094 0 62975 94 84 10 19 0 158 4 amappl16 192 52287 0 51548 258 209 49 49 0 8 12 amappl15 184 307 0 307 3 3 0 1 0 8 0 amappl14 176 1016 0 1011 1 0 1 1 0 8 0 amappl13 168 1434 0 1434 4 4 0 1 0 8 0 amappl12 160 2570 0 2568 1 0 1 1 0 8 0 amappl11 152 2833 0 2813 1 0 1 1 0 8 0 amappl10 144 1233 0 1230 1 0 1 1 0 8 0 amappl9 136 2378 0 2375 1 0 1 1 0 8 0 amappl8 128 1841 0 1820 1 0 1 1 0 8 0 amappl7 120 1225 0 1217 1 0 1 1 0 8 0 amappl6 112 2724 0 2712 1 0 1 1 0 8 0 amappl5 104 2938 0 2923 1 0 1 1 0 8 0 amappl4 96 10126 0 10097 2 1 1 2 0 8 0 amappl3 88 2352 0 2342 1 0 1 1 0 8 0 amappl2 80 81652 0 81570 3 1 2 3 0 8 0 amappl1 72 231955 0 231487 26 16 10 20 0 8 0 amappl 80 32543 0 32499 2 0 2 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 64 145 0 16 3 0 3 3 0 8 0 uaddrrnd 24 10459 0 10442 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 10459 0 10442 1 0 1 1 0 8 0 vmmpekpl 168 78188 0 78150 3 1 2 3 0 8 0 vmmpepl 168 1269657 0 1267666 497 390 107 118 0 357 20 vmsppl 368 10458 0 10442 2 0 2 2 0 8 0 pdppl 4096 20925 0 20884 8 2 6 6 0 8 0 pvpl 32 2534999 0 2519788 528 356 172 175 0 265 31 pmappl 232 10458 0 10442 4 3 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 677 0 69 19 0 19 19 0 8 0