witness: lock order reversal: 1st 0xfffffd806e44d6f8 inode (&ip->i_lock) 2nd 0xfffffd806e8c79f0 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(fffffd806e8c79f0,9,0) at witness_checkorder+0xffc witness_debugger sys/kern/subr_witness.c:2506 [inline] witness_checkorder(fffffd806e8c79f0,9,0) at witness_checkorder+0xffc sys/kern/subr_witness.c:1086 rw_enter_write(fffffd806e8c79e0) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:125 diskmapioctl(5a00,c0106477,ffff80002196efc0,1,ffff800020abe508) at diskmapioctl+0x237 sys/dev/diskmap.c:106 VOP_IOCTL(fffffd806fa7d710,c0106477,ffff80002196efc0,1,fffffd807f7c69c0,ffff800020abe508) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 vn_ioctl(fffffd807e7d9430,c0106477,ffff80002196efc0,ffff800020abe508) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 sys_ioctl(ffff800020abe508,ffff80002196f0d8,ffff80002196f140) at sys_ioctl+0x5b8 syscall(ffff80002196f1b0) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff80002196f1b0) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff1b,0,3,1c2b70551b0) at Xsyscall+0x128 end of kernel end trace frame: 0x1c552b64bb0, count: -9 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff80002196eb80 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800021f70000 rax 0xffff800000ad24c0 r8 0xffffffff81756bc5 witness_checkorder+0xfd5 r9 0x5 r10 0x3 r11 0xd8ce1dea4a036640 r12 0xfffffd80029b8c00 r13 0 r14 0xffffffff825cedd0 w_lodata+0x38b80 r15 0xffffffff825ea470 w_lodata+0x54220 rip 0xffffffff8209fa08 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002196eb70 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=310425 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff800020abf650,0xffff800020abf8d8 process=0xffff800020adc700 user=0xffff80002196a000, vmspace=0xfffffd807f00ca10 estcpu=29, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 16116 267146 17731 0 7 0 syz-executor.0 16116 521208 17731 0 2 0x4000000 syz-executor.0 16116 346909 17731 0 2 0x4000000 syz-executor.0 *16116 310425 17731 0 7 0x4000000 syz-executor.0 16116 152363 17731 0 2 0x4000000 syz-executor.0 90466 96441 38869 0 3 0x82 piperd syz-executor.1 17731 115830 38869 0 3 0x82 nanosleep syz-executor.0 12391 482092 1 0 3 0x100083 ttyin getty 82429 47436 0 0 3 0x14200 bored sosplice 38869 60054 65513 0 3 0x82 thrsleep syz-fuzzer 38869 213595 65513 0 3 0x4000082 thrsleep syz-fuzzer 38869 79745 65513 0 3 0x4000082 thrsleep syz-fuzzer 38869 197584 65513 0 3 0x4000082 thrsleep syz-fuzzer 38869 518806 65513 0 3 0x4000082 thrsleep syz-fuzzer 38869 90004 65513 0 3 0x4000082 kqread syz-fuzzer 38869 495393 65513 0 3 0x4000082 thrsleep syz-fuzzer 38869 361677 65513 0 3 0x4000082 thrsleep syz-fuzzer 38869 458190 65513 0 3 0x4000082 thrsleep syz-fuzzer 38869 161398 65513 0 3 0x4000082 thrsleep syz-fuzzer 65513 154231 82582 0 3 0x10008a pause ksh 82582 222852 22884 0 3 0x92 select sshd 22884 93996 1 0 3 0x80 select sshd 27347 97430 99804 74 3 0x100092 bpf pflogd 99804 273597 1 0 3 0x80 netio pflogd 78136 441410 44764 73 3 0x100090 kqread syslogd 44764 304538 1 0 3 0x100082 netio syslogd 46399 493401 1 77 3 0x100090 poll dhclient 79743 44340 1 0 3 0x80 poll dhclient 50964 81176 0 0 3 0x14200 pgzero zerothread 20737 113196 0 0 3 0x14200 aiodoned aiodoned 52258 84838 0 0 3 0x14200 syncer update 35230 213264 0 0 3 0x14200 cleaner cleaner 29561 94992 0 0 3 0x14200 reaper reaper 27224 41510 0 0 3 0x14200 pgdaemon pagedaemon 60576 363689 0 0 3 0x14200 bored crynlk 58968 142331 0 0 3 0x14200 bored crypto 13066 478593 0 0 3 0x40014200 acpi0 acpi0 83003 35573 0 0 3 0x40014200 idle1 39796 378001 0 0 3 0x14200 bored softnet 53381 206417 0 0 3 0x14200 bored systqmp 92475 484901 0 0 3 0x14200 bored systq 87338 501702 0 0 3 0x40014200 bored softclock 4517 419408 0 0 3 0x40014200 idle0 21835 472272 0 0 3 0x14200 bored smr 1 57346 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 16116 (syz-executor.0) thread 0xffff800020abe508 (310425) exclusive rrwlock inode r = 0 (0xfffffd806e44d6f8) #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 6482K 10812K 78643K 60918 0 0 pcb 13 8K 8K 78643K 1573 0 0 rtable 119 13K 13K 78643K 6686 0 0 ifaddr 93 28K 36K 78643K 2401 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 2397 0 0 iov 0 0K 28K 78643K 1898 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1208 76K 77K 78643K 19271 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 252 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 0K 78643K 2143 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 5 13K 25K 78643K 19355 0 0 sigio 0 0K 0K 78643K 242 0 0 proc 54 51K 83K 78643K 4992 0 0 subproc 32 2K 2K 78643K 1148 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 1568 0 0 in_multi 33 2K 2K 78643K 1308 0 0 ether_multi 1 0K 0K 78643K 101 0 0 mrt 0 0K 0K 78643K 106 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 2624 0 0 pfkey data 0 0K 0K 78643K 9 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 128 23K 33K 78643K 62279 0 0 UVM aobj 130 4K 4K 78643K 151 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 1414 0 0 NDP 23 0K 1K 78643K 733 0 0 temp 249 3557K 4197K 78643K 371490 0 0 kqueue 0 0K 0K 78643K 177 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 64 139 0 133 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 855 0 853 1 0 1 1 0 8 0 rtentry 112 799 0 755 2 0 2 2 0 8 0 unpcb 120 5943 0 5933 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 9472 0 9472 2 2 0 1 0 8 0 tcpcb 544 3215 0 3211 1 0 1 1 0 8 0 inpcb 280 9351 0 9340 17 15 2 2 0 8 1 rttmr 72 28 0 28 23 23 0 1 0 8 0 ip6q 72 7 0 7 5 5 0 1 0 8 0 ip6af 48 14 0 14 5 5 0 1 0 8 0 nd6 48 198 0 192 1 0 1 1 0 8 0 pkpcb 40 85 0 85 34 34 0 1 0 8 0 swfcl 56 8 0 0 1 0 1 1 0 8 0 ppxss 1128 413 0 413 42 41 1 1 0 8 1 pffrag 232 43 0 43 21 21 0 1 0 482 0 pffrnode 88 43 0 43 21 21 0 1 0 8 0 pffrent 40 102 0 102 21 21 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 24 516 0 499 1 0 1 1 0 8 0 pfstkey 112 518 0 501 3 1 2 2 0 8 0 pfstate 328 518 0 501 10 7 3 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 3335 0 3138 24 11 13 14 0 8 0 art_table 32 3336 0 3138 2 0 2 2 0 8 0 art_node 16 781 0 741 1 0 1 1 0 8 0 sysvmsgpl 40 28 0 19 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 2139 0 2129 1 0 1 1 0 8 0 shmpl 112 149 0 21 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 31037 0 29559 50 2 48 48 0 8 0 ffsino 272 31037 0 29559 99 0 99 99 0 8 0 nchpl 144 57993 0 56356 62 0 62 62 0 8 0 uvmvnodes 72 7232 0 0 132 0 132 132 0 8 0 vnodes 200 7232 0 0 381 0 381 381 0 8 0 namei 1024 191476 0 191476 6 5 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 32 0 32 20 20 0 1 0 8 0 scxspl 192 171318 0 171318 77 76 1 7 0 8 1 plimitpl 152 1596 0 1588 1 0 1 1 0 8 0 sigapl 432 19377 0 19362 3 1 2 3 0 8 0 futexpl 56 243361 0 243361 6 5 1 1 0 8 1 knotepl 112 4429 0 4410 1 0 1 1 0 8 0 kqueuepl 104 4093 0 4091 1 0 1 1 0 8 0 pipepl 112 10586 0 10567 21 19 2 2 0 8 1 fdescpl 488 19378 0 19362 3 0 3 3 0 8 0 filepl 152 112770 0 112664 34 27 7 7 0 8 2 lockfpl 104 5987 0 5987 6 5 1 1 0 8 1 lockfspl 48 2024 0 2024 6 5 1 1 0 8 1 sessionpl 112 96 0 85 1 0 1 1 0 8 0 pgrppl 48 262 0 251 1 0 1 1 0 8 0 ucredpl 96 21234 0 21223 1 0 1 1 0 8 0 zombiepl 144 19368 0 19368 5 4 1 1 0 8 1 processpl 896 19400 0 19368 4 0 4 4 0 8 0 procpl 632 58101 0 58056 10 5 5 5 0 8 0 srpgc 64 156 0 156 61 60 1 1 0 8 1 sosppl 128 239 0 239 52 52 0 1 0 8 0 sockpl 384 16435 0 16416 28 24 4 4 0 8 2 mcl64k 65536 1289 0 0 157 28 129 129 0 8 0 mcl16k 16384 35 0 0 5 3 2 3 0 8 0 mcl12k 12288 59 0 0 2 0 2 2 0 8 0 mcl9k 9216 51 0 0 2 0 2 2 0 8 0 mcl8k 8192 41 0 0 6 3 3 3 0 8 1 mcl4k 4096 25 0 0 4 1 3 3 0 8 0 mcl2k2 2112 12 0 0 1 0 1 1 0 8 0 mcl2k 2048 176 0 0 16 3 13 16 0 8 0 mtagpl 80 104 0 0 1 0 1 1 0 8 0 mbufpl 256 1995 0 0 71 1 70 70 0 8 0 bufpl 256 53332 0 46099 453 0 453 453 0 8 0 anonpl 16 1751517 0 1740910 366 306 60 68 0 124 0 amapchunkpl 152 113637 0 113525 101 94 7 19 0 158 0 amappl16 192 96470 0 95784 453 416 37 48 0 8 1 amappl15 184 3735 0 3735 12 12 0 1 0 8 0 amappl14 176 4042 0 4036 1 0 1 1 0 8 0 amappl13 168 5075 0 5073 1 0 1 1 0 8 0 amappl12 160 1546 0 1542 3 2 1 1 0 8 0 amappl11 152 2962 0 2944 1 0 1 1 0 8 0 amappl10 144 2493 0 2487 1 0 1 1 0 8 0 amappl9 136 2272 0 2269 1 0 1 1 0 8 0 amappl8 128 1743 0 1693 3 1 2 2 0 8 0 amappl7 120 2608 0 2600 1 0 1 1 0 8 0 amappl6 112 2780 0 2765 1 0 1 1 0 8 0 amappl5 104 2229 0 2213 1 0 1 1 0 8 0 amappl4 96 18633 0 18598 2 1 1 2 0 8 0 amappl3 88 6465 0 6455 1 0 1 1 0 8 0 amappl2 80 153175 0 153097 3 1 2 3 0 8 0 amappl1 72 421566 0 421118 27 17 10 20 0 8 0 amappl 80 59551 0 59511 2 1 1 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 64 150 0 21 3 0 3 3 0 8 0 uaddrrnd 24 19378 0 19362 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 19378 0 19362 1 0 1 1 0 8 0 vmmpekpl 168 126177 0 126143 4 1 3 3 0 8 0 vmmpepl 168 2353709 0 2351835 676 568 108 122 0 357 13 vmsppl 368 19377 0 19362 2 0 2 2 0 8 0 pdppl 4096 38763 0 38724 8 2 6 6 0 8 0 pvpl 32 4643425 0 4629561 795 640 155 168 0 265 14 pmappl 232 19377 0 19362 4 3 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 860 0 60 23 0 23 23 0 8 0