witness: lock order reversal: 1st 0xfffffd806e1b1a28 inode (&ip->i_lock) 2nd 0xfffffd807bda4dc0 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(fffffd807bda4dc0,9,0) at witness_checkorder+0xffc witness_debugger sys/kern/subr_witness.c:2506 [inline] witness_checkorder(fffffd807bda4dc0,9,0) at witness_checkorder+0xffc sys/kern/subr_witness.c:1086 rw_enter_write(fffffd807bda4db0) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:125 diskmapioctl(5a00,c0106477,ffff800022d73440,1,ffff800020acea48) at diskmapioctl+0x237 sys/dev/diskmap.c:106 VOP_IOCTL(fffffd806fa70008,c0106477,ffff800022d73440,1,fffffd807f7c6540,ffff800020acea48) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8067b19bf8,c0106477,ffff800022d73440,ffff800020acea48) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 sys_ioctl(ffff800020acea48,ffff800022d73558,ffff800022d735c0) at sys_ioctl+0x5b8 syscall(ffff800022d73630) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800022d73630) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff1b,0,3,ce1de2b7010) at Xsyscall+0x128 end of kernel end trace frame: 0xce45d1ab0f0, count: -9 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800022d73000 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800020b4a000 rax 0xffff800000a75e00 r8 0xffffffff81756bc5 witness_checkorder+0xfd5 r9 0x5 r10 0x3 r11 0xcc2d9fca8fbcf906 r12 0xfffffd80029b8c00 r13 0 r14 0xffffffff825d2dc0 w_lodata+0x3cb70 r15 0xffffffff825ea680 w_lodata+0x54430 rip 0xffffffff8209fa08 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800022d72ff0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=145792 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=80, nice=20 forw=0xffffffffffffffff, list=0xffff800020ace2e0,0xffff800020acfba0 process=0xffff800020adc700 user=0xffff800022d6e000, vmspace=0xfffffd807f00c450 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 94802 27140 22139 0 2 0 syz-executor.0 94802 410647 22139 0 3 0x4000080 fsleep syz-executor.0 94802 375207 22139 0 3 0x4000080 fsleep syz-executor.0 94802 275106 22139 0 7 0x4000000 syz-executor.0 59895 226936 45872 0 2 0 syz-executor.1 *59895 145792 45872 0 7 0x4000000 syz-executor.1 59895 311578 45872 0 3 0x4000080 fsleep syz-executor.1 22139 183866 53710 0 3 0x82 nanosleep syz-executor.0 45872 279523 53710 0 3 0x82 nanosleep syz-executor.1 17058 305620 1 0 3 0x100083 ttyin getty 35926 37330 0 0 3 0x14200 bored sosplice 53710 112039 41139 0 3 0x82 thrsleep syz-fuzzer 53710 363309 41139 0 3 0x4000082 thrsleep syz-fuzzer 53710 49271 41139 0 3 0x4000082 thrsleep syz-fuzzer 53710 54501 41139 0 3 0x4000082 thrsleep syz-fuzzer 53710 359458 41139 0 3 0x4000082 thrsleep syz-fuzzer 53710 348022 41139 0 3 0x4000082 thrsleep syz-fuzzer 53710 148129 41139 0 3 0x4000082 thrsleep syz-fuzzer 53710 357859 41139 0 3 0x4000082 thrsleep syz-fuzzer 53710 106153 41139 0 3 0x4000082 kqread syz-fuzzer 53710 395672 41139 0 3 0x4000082 thrsleep syz-fuzzer 41139 195523 9411 0 3 0x10008a pause ksh 9411 209277 89260 0 3 0x92 select sshd 89260 215760 1 0 3 0x80 select sshd 28551 283312 70189 74 3 0x100092 bpf pflogd 70189 375108 1 0 3 0x80 netio pflogd 88133 280963 39297 73 3 0x100090 kqread syslogd 39297 152702 1 0 3 0x100082 netio syslogd 24211 132894 1 77 3 0x100090 poll dhclient 39503 97073 1 0 3 0x80 poll dhclient 88591 152987 0 0 2 0x14200 zerothread 79339 316305 0 0 3 0x14200 aiodoned aiodoned 7216 328973 0 0 3 0x14200 syncer update 88000 159930 0 0 3 0x14200 cleaner cleaner 54249 312535 0 0 3 0x14200 reaper reaper 21005 244433 0 0 3 0x14200 pgdaemon pagedaemon 23232 316214 0 0 3 0x14200 bored crynlk 91802 113965 0 0 3 0x14200 bored crypto 7926 168309 0 0 3 0x40014200 acpi0 acpi0 54689 236412 0 0 3 0x40014200 idle1 38746 361117 0 0 3 0x14200 bored softnet 20227 444941 0 0 3 0x14200 bored systqmp 79041 12948 0 0 3 0x14200 bored systq 88640 332712 0 0 3 0x40014200 bored softclock 91272 448856 0 0 3 0x40014200 idle0 92493 431286 0 0 3 0x14200 bored smr 1 118652 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 59895 (syz-executor.1) thread 0xffff800020acea48 (145792) exclusive rrwlock inode r = 0 (0xfffffd806e1b1a28) #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 (0xffffffff826491e0) #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 9637 6548K 14752K 78643K 38509 0 0 pcb 13 8K 8K 78643K 841 0 0 rtable 117 12K 13K 78643K 3428 0 0 ifaddr 90 24K 28K 78643K 1298 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 2036 0 0 iov 0 0K 32K 78643K 1032 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1202 75K 77K 78643K 11034 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 144 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 1123 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 6 17K 25K 78643K 10686 0 0 sigio 0 0K 0K 78643K 109 0 0 proc 55 51K 83K 78643K 2631 0 0 subproc 32 2K 2K 78643K 516 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 945 0 0 in_multi 33 2K 2K 78643K 696 0 0 ether_multi 1 0K 0K 78643K 48 0 0 mrt 0 0K 0K 78643K 40 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 138 609K 609K 78643K 138 0 0 exec 0 0K 1K 78643K 1425 0 0 pfkey data 0 0K 0K 78643K 2 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 117 22K 31K 78643K 34822 0 0 UVM aobj 130 6K 6K 78643K 149 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 844 0 0 NDP 22 0K 0K 78643K 388 0 0 temp 242 3557K 4197K 78643K 172108 0 0 kqueue 0 0K 0K 78643K 68 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 66 0 60 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 497 0 495 1 0 1 1 0 8 0 rtentry 112 370 0 326 3 1 2 2 0 8 0 unpcb 120 3543 0 3533 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 9475 0 9475 2 2 0 2 0 8 0 tcpcb 544 1742 0 1738 1 0 1 1 0 8 0 inpcb 280 5209 0 5200 6 5 1 2 0 8 0 rttmr 72 5 0 5 4 4 0 1 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 90 0 84 1 0 1 1 0 8 0 pkpcb 40 50 0 50 15 15 0 1 0 8 0 swfcl 56 9 0 0 1 0 1 1 0 8 0 ppxss 1128 231 0 231 25 25 0 1 0 8 0 pffrag 232 28 0 28 15 15 0 1 0 482 0 pffrnode 88 28 0 28 15 15 0 1 0 8 0 pffrent 40 69 0 69 16 16 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 24 300 0 265 1 0 1 1 0 8 0 pfstkey 112 301 0 266 3 1 2 2 0 8 0 pfstate 328 301 0 266 7 3 4 4 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 1502 0 1304 17 4 13 13 0 8 0 art_table 32 1503 0 1304 2 0 2 2 0 8 0 art_node 16 361 0 321 1 0 1 1 0 8 0 sysvmsgpl 40 29 0 20 1 0 1 1 0 8 0 semapl 112 1119 0 1109 1 0 1 1 0 8 0 shmpl 112 147 0 19 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 17903 0 16462 47 0 47 47 0 8 0 ffsino 272 17903 0 16462 97 0 97 97 0 8 0 nchpl 144 32912 0 31281 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 107817 0 107817 5 4 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 18 0 18 11 11 0 1 0 8 0 scxspl 192 97265 0 97265 46 44 2 7 0 8 2 plimitpl 152 992 0 984 1 0 1 1 0 8 0 sigapl 432 10807 0 10791 3 1 2 3 0 8 0 futexpl 56 133832 0 133829 5 4 1 1 0 8 0 knotepl 112 2160 0 2141 1 0 1 1 0 8 0 kqueuepl 104 2113 0 2111 1 0 1 1 0 8 0 pipepl 112 5834 0 5815 12 10 2 2 0 8 1 fdescpl 488 10808 0 10791 3 0 3 3 0 8 0 filepl 152 63184 0 63078 19 13 6 7 0 8 1 lockfpl 104 3353 0 3353 5 4 1 1 0 8 1 lockfspl 48 1143 0 1143 5 4 1 1 0 8 1 sessionpl 112 51 0 40 1 0 1 1 0 8 0 pgrppl 48 143 0 132 1 0 1 1 0 8 0 ucredpl 96 12032 0 12021 1 0 1 1 0 8 0 zombiepl 144 10793 0 10793 6 5 1 1 0 8 1 processpl 896 10826 0 10793 4 0 4 4 0 8 0 procpl 632 32507 0 32460 14 9 5 5 0 8 0 srpgc 64 61 0 61 24 24 0 1 0 8 0 sosppl 128 152 0 152 30 30 0 1 0 8 0 sockpl 384 9410 0 9389 17 14 3 4 0 8 0 mcl64k 65536 771 0 0 97 58 39 97 0 8 1 mcl16k 16384 16 0 0 2 0 2 2 0 8 0 mcl12k 12288 38 0 0 3 1 2 2 0 8 0 mcl9k 9216 25 0 0 2 0 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 7 0 0 1 0 1 1 0 8 0 mcl2k 2048 264 0 0 29 14 15 29 0 8 0 mtagpl 80 95 0 0 1 0 1 1 0 8 0 mbufpl 256 1063 0 0 54 0 54 54 0 8 0 bufpl 256 28686 0 21667 439 0 439 439 0 8 0 anonpl 16 984400 0 972198 306 240 66 68 0 124 9 amapchunkpl 152 63730 0 63614 103 94 9 19 0 158 4 amappl16 192 53660 0 52946 316 272 44 49 0 8 8 amappl15 184 1955 0 1955 5 5 0 1 0 8 0 amappl14 176 2286 0 2282 1 0 1 1 0 8 0 amappl13 168 2940 0 2939 6 5 1 1 0 8 0 amappl12 160 1501 0 1498 1 0 1 1 0 8 0 amappl11 152 484 0 469 1 0 1 1 0 8 0 amappl10 144 438 0 434 1 0 1 1 0 8 0 amappl9 136 2689 0 2684 1 0 1 1 0 8 0 amappl8 128 2190 0 2156 2 0 2 2 0 8 0 amappl7 120 462 0 453 1 0 1 1 0 8 0 amappl6 112 423 0 414 1 0 1 1 0 8 0 amappl5 104 1883 0 1867 1 0 1 1 0 8 0 amappl4 96 10015 0 9979 2 1 1 2 0 8 0 amappl3 88 4504 0 4494 1 0 1 1 0 8 0 amappl2 80 85808 0 85726 3 1 2 3 0 8 0 amappl1 72 239105 0 238634 27 17 10 20 0 8 0 amappl 80 33282 0 33240 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 64 148 0 19 3 0 3 3 0 8 0 uaddrrnd 24 10808 0 10791 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 10808 0 10791 1 0 1 1 0 8 0 vmmpekpl 168 82595 0 82562 3 1 2 2 0 8 0 vmmpepl 168 1313614 0 1311632 463 367 96 107 0 357 9 vmsppl 368 10807 0 10791 2 0 2 2 0 8 0 pdppl 4096 21623 0 21582 7 1 6 6 0 8 0 pvpl 32 2606442 0 2590924 581 419 162 168 0 265 26 pmappl 232 10807 0 10791 2 1 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 765 0 85 22 0 22 22 0 8 0