witness: lock order reversal: 1st 0xfffffd806e08da28 inode (&ip->i_lock) 2nd 0xfffffd807bf83620 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(fffffd807bf83620,9,0) at witness_checkorder+0xffc witness_debugger sys/kern/subr_witness.c:2506 [inline] witness_checkorder(fffffd807bf83620,9,0) at witness_checkorder+0xffc sys/kern/subr_witness.c:1086 rw_enter_write(fffffd807bf83610) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:125 diskmapioctl(5a00,c0106477,ffff800020b5bca0,1,ffff800020a5f150) at diskmapioctl+0x237 sys/dev/diskmap.c:106 VOP_IOCTL(fffffd806fa6f4b8,c0106477,ffff800020b5bca0,1,fffffd807f7c6840,ffff800020a5f150) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8067af3440,c0106477,ffff800020b5bca0,ffff800020a5f150) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 sys_ioctl(ffff800020a5f150,ffff800020b5bdb8,ffff800020b5be20) at sys_ioctl+0x5b8 syscall(ffff800020b5be90) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800020b5be90) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff1b,0,3,ef4e19d6010) at Xsyscall+0x128 end of kernel end trace frame: 0xef7a51c6b80, count: -9 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800020b5b860 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800021782000 rax 0xffff800000ae4340 r8 0xffffffff8156e4e5 witness_checkorder+0xfd5 r9 0x5 r10 0x3 r11 0x69cf859c3ccccba1 r12 0xfffffd80029b8c00 r13 0 r14 0xffffffff825d4250 w_lodata+0x3f140 r15 0xffffffff825e9490 w_lodata+0x54380 rip 0xffffffff819f49b8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020b5b850 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=414196 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=82, nice=20 forw=0xffffffffffffffff, list=0xffff800020a5e280,0xffff800020abe028 process=0xffff800020adc000 user=0xffff800020b56000, vmspace=0xfffffd807f00c5c0 estcpu=32, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 25220 177625 77546 0 2 0 syz-executor.1 *25220 414196 77546 0 7 0x4000000 syz-executor.1 25220 345869 77546 0 2 0x4000000 syz-executor.1 25220 416236 77546 0 3 0x4000080 fsleep syz-executor.1 77546 485595 43008 0 3 0x82 nanosleep syz-executor.1 55725 40509 43008 0 3 0x82 nanosleep syz-executor.0 242 299231 1 0 3 0x100083 ttyin getty 52452 471373 0 0 3 0x14200 bored sosplice 43008 443222 90974 0 3 0x82 thrsleep syz-fuzzer 43008 332757 90974 0 3 0x4000082 thrsleep syz-fuzzer 43008 133224 90974 0 3 0x4000082 thrsleep syz-fuzzer 43008 318931 90974 0 3 0x4000082 thrsleep syz-fuzzer 43008 263457 90974 0 3 0x4000082 thrsleep syz-fuzzer 43008 106047 90974 0 3 0x4000082 thrsleep syz-fuzzer 43008 441954 90974 0 3 0x4000082 kqread syz-fuzzer 43008 389386 90974 0 3 0x4000082 thrsleep syz-fuzzer 43008 70500 90974 0 3 0x4000082 thrsleep syz-fuzzer 43008 490346 90974 0 3 0x4000082 thrsleep syz-fuzzer 90974 77347 6781 0 3 0x10008a pause ksh 6781 38024 89168 0 3 0x92 select sshd 89168 382756 1 0 3 0x80 select sshd 87732 166988 41186 74 3 0x100092 bpf pflogd 41186 222231 1 0 3 0x80 netio pflogd 17991 2644 18647 73 3 0x100090 kqread syslogd 18647 133999 1 0 3 0x100082 netio syslogd 44317 18256 0 0 2 0x14200 zerothread 58788 301543 0 0 3 0x14200 aiodoned aiodoned 4727 159758 0 0 3 0x14200 syncer update 73656 14840 0 0 3 0x14200 cleaner cleaner 64488 218005 0 0 7 0x14200 reaper 7589 382290 0 0 3 0x14200 pgdaemon pagedaemon 71751 297672 0 0 3 0x14200 bored crynlk 69475 243393 0 0 3 0x14200 bored crypto 78178 478135 0 0 3 0x40014200 acpi0 acpi0 527 212753 0 0 3 0x40014200 idle1 98431 137061 0 0 3 0x14200 bored softnet 64985 80969 0 0 3 0x14200 bored systqmp 85190 427358 0 0 3 0x14200 bored systq 42440 5066 0 0 3 0x40014200 bored softclock 58085 92157 0 0 3 0x40014200 idle0 36117 340157 0 0 3 0x14200 bored smr 1 384117 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 25220 (syz-executor.1) thread 0xffff800020a5f150 (414196) exclusive rrwlock inode r = 0 (0xfffffd806e08da28) #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 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9578 6397K 7169K 78643K 22382 0 0 pcb 13 8K 8K 78643K 544 0 0 rtable 111 4K 5K 78643K 1068 0 0 ifaddr 77 16K 17K 78643K 518 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1679 0 0 iov 0 0K 28K 78643K 427 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1208 76K 77K 78643K 5390 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 50 0 0 VM map 2 1K 1K 78643K 9 0 0 sem 12 0K 0K 78643K 520 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 5 13K 25K 78643K 4611 0 0 sigio 0 0K 0K 78643K 64 0 0 proc 54 51K 83K 78643K 1476 0 0 subproc 32 2K 2K 78643K 309 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 374 0 0 in_multi 33 2K 2K 78643K 353 0 0 ether_multi 1 0K 0K 78643K 29 0 0 mrt 1 0K 0K 78643K 14 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 108 477K 477K 78643K 108 0 0 exec 0 0K 1K 78643K 766 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 119 22K 30K 78643K 15769 0 0 UVM aobj 130 5K 5K 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 1K 78643K 579 0 0 NDP 18 0K 0K 78643K 162 0 0 temp 214 3556K 3632K 78643K 66703 0 0 kqueue 0 0K 0K 78643K 48 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 39 0 33 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 230 0 230 8 7 1 1 0 8 1 rtentry 112 224 0 180 2 0 2 2 0 8 0 unpcb 120 1438 0 1430 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 6906 0 6906 1 1 0 1 0 8 0 tcpcb 544 871 0 867 1 0 1 1 0 8 0 inpcb 280 2652 0 2646 3 2 1 2 0 8 0 rttmr 72 2 0 2 2 2 0 1 0 8 0 nd6 48 54 0 48 1 0 1 1 0 8 0 pkpcb 40 17 0 17 8 7 1 1 0 8 1 swfcl 56 7 0 0 1 0 1 1 0 8 0 ppxss 1128 71 0 71 11 10 1 1 0 8 1 pffrag 232 6 0 6 4 4 0 1 0 482 0 pffrnode 88 6 0 6 4 4 0 1 0 8 0 pffrent 40 14 0 14 4 4 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 24 135 0 110 1 0 1 1 0 8 0 pfstkey 112 138 0 113 1 0 1 1 0 8 0 pfstate 328 138 0 113 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 256 926 0 735 14 1 13 13 0 8 0 art_table 32 927 0 735 2 0 2 2 0 8 0 art_node 16 223 0 183 1 0 1 1 0 8 0 sysvmsgpl 40 14 0 9 1 0 1 1 0 8 0 semapl 112 518 0 508 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 8417 0 6988 47 0 47 47 0 8 0 ffsino 272 8417 0 6988 96 0 96 96 0 8 0 nchpl 144 14950 0 13313 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 48642 0 48642 3 2 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vmpool 552 7 0 7 4 4 0 1 0 8 0 scsiplug 64 7 0 7 6 5 1 1 0 8 1 scxspl 192 45353 0 45353 28 27 1 7 0 8 1 plimitpl 152 402 0 395 1 0 1 1 0 8 0 sigapl 432 4765 0 4752 3 1 2 3 0 8 0 futexpl 56 59584 0 59583 1 0 1 1 0 8 0 knotepl 112 1139 0 1120 1 0 1 1 0 8 0 kqueuepl 104 985 0 983 1 0 1 1 0 8 0 pipepl 112 2694 0 2675 3 2 1 2 0 8 0 fdescpl 488 4766 0 4752 3 0 3 3 0 8 0 filepl 152 28075 0 27982 17 12 5 7 0 8 1 lockfpl 104 1527 0 1527 5 4 1 1 0 8 1 lockfspl 48 519 0 519 5 4 1 1 0 8 1 sessionpl 112 36 0 27 1 0 1 1 0 8 0 pgrppl 48 67 0 58 1 0 1 1 0 8 0 ucredpl 96 5189 0 5181 1 0 1 1 0 8 0 zombiepl 144 4753 0 4752 3 2 1 1 0 8 0 processpl 896 4783 0 4752 4 0 4 4 0 8 0 procpl 632 14138 0 14095 15 11 4 5 0 8 0 srpgc 64 34 0 34 11 11 0 1 0 8 0 sosppl 128 71 0 71 12 11 1 1 0 8 1 sockpl 384 4367 0 4355 14 11 3 4 0 8 1 mcl64k 65536 259 0 0 33 2 31 33 0 8 1 mcl16k 16384 6 0 0 1 0 1 1 0 8 0 mcl12k 12288 25 0 0 2 0 2 2 0 8 0 mcl9k 9216 17 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 12 0 0 2 0 2 2 0 8 0 mcl2k2 2112 12 0 0 1 0 1 1 0 8 0 mcl2k 2048 182 0 0 20 4 16 20 0 8 0 mtagpl 80 23 0 0 1 0 1 1 0 8 0 mbufpl 256 480 0 0 21 0 21 21 0 8 0 bufpl 256 20699 0 13680 439 0 439 439 0 8 0 anonpl 16 476734 0 464800 160 98 62 69 0 124 6 amapchunkpl 152 28893 0 28753 28 21 7 11 0 158 0 amappl16 192 24245 0 23561 167 124 43 47 0 8 8 amappl15 184 1802 0 1800 3 2 1 1 0 8 0 amappl14 176 1701 0 1695 1 0 1 1 0 8 0 amappl13 168 56 0 56 3 3 0 1 0 8 0 amappl12 160 101 0 99 2 1 1 1 0 8 0 amappl11 152 109 0 101 1 0 1 1 0 8 0 amappl10 144 1446 0 1440 1 0 1 1 0 8 0 amappl9 136 816 0 812 1 0 1 1 0 8 0 amappl8 128 359 0 329 4 2 2 2 0 8 0 amappl7 120 1453 0 1445 1 0 1 1 0 8 0 amappl6 112 82 0 72 1 0 1 1 0 8 0 amappl5 104 328 0 316 1 0 1 1 0 8 0 amappl4 96 4505 0 4475 1 0 1 1 0 8 0 amappl3 88 1643 0 1632 1 0 1 1 0 8 0 amappl2 80 37328 0 37253 3 1 2 3 0 8 0 amappl1 72 111973 0 111535 26 16 10 20 0 8 0 amappl 80 14716 0 14670 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 64 147 0 18 3 0 3 3 0 8 0 uaddrrnd 24 4773 0 4752 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4773 0 4752 1 0 1 1 0 8 0 vmmpekpl 168 37334 0 37298 2 0 2 2 0 8 0 vmmpepl 168 583024 0 581180 272 171 101 103 0 357 18 vmsppl 368 4765 0 4751 2 0 2 2 0 8 0 pdppl 4096 9553 0 9516 7 2 5 6 0 8 0 pvpl 32 1260102 0 1245087 314 157 157 176 0 265 24 pmappl 232 4772 0 4758 3 2 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 650 0 14 19 0 19 19 0 8 0