witness: lock order reversal: 1st 0xfffffd80698edc50 inode (&ip->i_lock) 2nd 0xfffffd806e657438 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(fffffd806e657438,9,0) at witness_checkorder+0xffc witness_debugger sys/kern/subr_witness.c:2506 [inline] witness_checkorder(fffffd806e657438,9,0) at witness_checkorder+0xffc sys/kern/subr_witness.c:1086 rw_enter_write(fffffd806e657428) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:125 diskmapioctl(5a00,c0106477,ffff8000229a9c50,1,ffff800020ab0780) at diskmapioctl+0x237 sys/dev/diskmap.c:106 VOP_IOCTL(fffffd806fa72580,c0106477,ffff8000229a9c50,1,fffffd807f7c6ae0,ffff800020ab0780) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 vn_ioctl(fffffd807e1bb7d8,c0106477,ffff8000229a9c50,ffff800020ab0780) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 sys_ioctl(ffff800020ab0780,ffff8000229a9d68,ffff8000229a9dd0) at sys_ioctl+0x5b8 syscall(ffff8000229a9e40) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff8000229a9e40) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff1b,0,3,2eaf27c7280) at Xsyscall+0x128 end of kernel end trace frame: 0x2ed38ea3d60, count: -9 ddb{1}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff8000229a9810 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff8000227a4000 rax 0xffff800000a748c0 r8 0xffffffff81ca8c05 witness_checkorder+0xfd5 r9 0x5 r10 0x3 r11 0x3bd1d19cfd3a9a6b r12 0xfffffd80029b9c00 r13 0 r14 0xffffffff82606cf0 w_lodata+0x415b0 r15 0xffffffff82619c20 w_lodata+0x544e0 rip 0xffffffff81f62b28 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000229a9800 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=112854 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=80, nice=20 forw=0xffffffffffffffff, list=0xffff800020ab0290,0xffff800020ab0028 process=0xffff800020a8ae10 user=0xffff8000229a4000, vmspace=0xfffffd807f00c8a0 estcpu=30, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 11572 53486 47861 0 7 0 syz-executor.1 11572 88365 47861 0 3 0x4000080 fsleep syz-executor.1 11572 237975 47861 0 2 0x4000000 syz-executor.1 11572 340227 47861 0 2 0x4000000 syz-executor.1 *11572 112854 47861 0 7 0x4000000 syz-executor.1 11572 57538 47861 0 2 0x4000000 syz-executor.1 11572 101073 47861 0 2 0x4000000 syz-executor.1 47861 228692 21949 0 3 0x82 nanosleep syz-executor.1 15479 468921 21949 0 3 0x82 piperd syz-executor.0 46308 445421 1 0 3 0x100083 ttyin getty 66595 209694 0 0 3 0x14200 bored sosplice 21949 443510 90991 0 3 0x82 thrsleep syz-fuzzer 21949 394248 90991 0 3 0x4000082 thrsleep syz-fuzzer 21949 441941 90991 0 3 0x4000082 thrsleep syz-fuzzer 21949 430586 90991 0 3 0x4000082 kqread syz-fuzzer 21949 108255 90991 0 3 0x4000082 thrsleep syz-fuzzer 21949 444981 90991 0 3 0x4000082 thrsleep syz-fuzzer 21949 418199 90991 0 3 0x4000082 thrsleep syz-fuzzer 21949 433468 90991 0 3 0x4000082 thrsleep syz-fuzzer 21949 186933 90991 0 3 0x4000082 thrsleep syz-fuzzer 21949 300061 90991 0 3 0x4000082 thrsleep syz-fuzzer 90991 90599 75144 0 3 0x10008a pause ksh 75144 299342 77570 0 3 0x92 select sshd 77570 342142 1 0 3 0x80 select sshd 83667 310406 34052 74 3 0x100092 bpf pflogd 34052 511216 1 0 3 0x80 netio pflogd 35832 59039 54937 73 3 0x100090 kqread syslogd 54937 123175 1 0 3 0x100082 netio syslogd 1371 51378 1 77 3 0x100090 poll dhclient 43833 384470 1 0 3 0x80 poll dhclient 95415 106791 0 0 3 0x14200 pgzero zerothread 79482 160463 0 0 3 0x14200 aiodoned aiodoned 38857 523870 0 0 3 0x14200 syncer update 60279 162040 0 0 3 0x14200 cleaner cleaner 73799 130029 0 0 3 0x14200 reaper reaper 19939 254517 0 0 3 0x14200 pgdaemon pagedaemon 23326 511238 0 0 3 0x14200 bored crynlk 78797 163676 0 0 3 0x14200 bored crypto 68705 279415 0 0 3 0x40014200 acpi0 acpi0 12308 51949 0 0 3 0x40014200 idle1 73277 128016 0 0 3 0x14200 bored softnet 69722 39325 0 0 3 0x14200 bored systqmp 83755 33920 0 0 3 0x14200 bored systq 45844 219760 0 0 3 0x40014200 bored softclock 50267 82204 0 0 3 0x40014200 idle0 13441 183837 0 0 3 0x14200 bored smr 1 98076 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 11572 (syz-executor.1) thread 0xffff800020ab0780 (112854) exclusive rrwlock inode r = 0 (0xfffffd80698edc50) #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 (0xffffffff8266bbe8) #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 9611 6464K 7228K 78643K 23741 0 0 pcb 13 8K 8K 78643K 450 0 0 rtable 117 12K 13K 78643K 1675 0 0 ifaddr 87 19K 21K 78643K 587 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1729 0 0 iov 0 0K 24K 78643K 510 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1197 75K 77K 78643K 5949 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 94 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 1K 78643K 735 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 5 13K 25K 78643K 5368 0 0 sigio 0 0K 0K 78643K 68 0 0 proc 54 51K 71K 78643K 1699 0 0 subproc 32 2K 2K 78643K 306 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 460 0 0 in_multi 33 2K 2K 78643K 356 0 0 ether_multi 1 0K 0K 78643K 25 0 0 mrt 0 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 120 530K 530K 78643K 120 0 0 exec 0 0K 1K 78643K 901 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 108 22K 31K 78643K 17865 0 0 UVM aobj 130 5K 5K 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 373 0 0 NDP 21 0K 0K 78643K 177 0 0 temp 235 3557K 4192K 78643K 78647 0 0 kqueue 0 0K 0K 78643K 33 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 40 0 33 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 218 0 216 1 0 1 1 0 8 0 rtentry 112 221 0 176 2 0 2 2 0 8 0 unpcb 120 1655 0 1645 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 9227 0 9227 1 1 0 1 0 8 0 tcpcb 544 845 0 841 1 0 1 1 0 8 0 inpcb 280 2788 0 2780 5 3 2 2 0 8 1 rttmr 72 2 0 2 2 2 0 1 0 8 0 nd6 48 50 0 44 1 0 1 1 0 8 0 pkpcb 40 35 0 35 12 12 0 1 0 8 0 swfcl 56 5 0 0 1 0 1 1 0 8 0 ppxss 1128 90 0 90 13 12 1 1 0 8 1 pffrag 232 12 0 12 8 8 0 1 0 482 0 pffrnode 88 12 0 12 8 8 0 1 0 8 0 pffrent 40 31 0 31 8 8 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 24 263 0 238 1 0 1 1 0 8 0 pfstkey 112 263 0 238 5 2 3 5 0 8 0 pfstate 328 263 0 238 13 9 4 13 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 256 844 0 648 16 3 13 13 0 8 0 art_table 32 845 0 648 2 0 2 2 0 8 0 art_node 16 212 0 171 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 6 1 0 1 1 0 8 0 semapl 112 727 0 717 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 9628 0 8196 47 0 47 47 0 8 0 ffsino 272 9628 0 8196 96 0 96 96 0 8 0 nchpl 144 17298 0 15659 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 55866 0 55866 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 26 0 26 15 15 0 1 0 8 0 scxspl 192 50913 0 50913 34 33 1 7 0 8 1 plimitpl 152 543 0 535 1 0 1 1 0 8 0 sigapl 432 5524 0 5509 3 1 2 3 0 8 0 futexpl 56 68342 0 68341 1 0 1 1 0 8 0 knotepl 112 1124 0 1105 1 0 1 1 0 8 0 kqueuepl 104 1083 0 1081 1 0 1 1 0 8 0 pipepl 112 3120 0 3101 7 6 1 2 0 8 0 fdescpl 488 5525 0 5509 3 0 3 3 0 8 0 filepl 152 31998 0 31892 14 9 5 8 0 8 0 lockfpl 104 1891 0 1891 2 1 1 1 0 8 1 lockfspl 48 628 0 628 2 1 1 1 0 8 1 sessionpl 112 38 0 27 1 0 1 1 0 8 0 pgrppl 48 79 0 68 1 0 1 1 0 8 0 ucredpl 96 5843 0 5833 1 0 1 1 0 8 0 zombiepl 144 5512 0 5512 2 1 1 1 0 8 1 processpl 896 5544 0 5512 4 0 4 4 0 8 0 procpl 632 16261 0 16214 5 0 5 5 0 8 1 srpgc 64 34 0 34 13 13 0 1 0 8 0 sosppl 128 52 0 52 11 10 1 1 0 8 1 sockpl 384 4749 0 4730 8 5 3 4 0 8 1 mcl64k 65536 25 0 0 3 0 3 3 0 8 0 mcl16k 16384 8 0 0 1 0 1 1 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 25 0 0 2 0 2 2 0 8 1 mcl8k 8192 11 0 0 2 0 2 2 0 8 0 mcl4k 4096 25 0 0 4 1 3 3 0 8 0 mcl2k2 2112 6 0 0 1 0 1 1 0 8 0 mcl2k 2048 136 0 0 16 0 16 16 0 8 0 mtagpl 80 39 0 0 1 0 1 1 0 8 0 mbufpl 256 498 0 0 29 0 29 29 0 8 0 bufpl 256 19630 0 12611 439 0 439 439 0 8 0 anonpl 16 497730 0 485138 151 83 68 68 0 124 12 amapchunkpl 152 32709 0 32593 45 35 10 10 0 158 4 amappl16 192 24514 0 23824 124 77 47 47 0 8 11 amappl15 184 1496 0 1496 2 2 0 1 0 8 0 amappl14 176 1331 0 1322 1 0 1 1 0 8 0 amappl13 168 517 0 516 4 3 1 1 0 8 0 amappl12 160 257 0 253 1 0 1 1 0 8 0 amappl11 152 371 0 355 1 0 1 1 0 8 0 amappl10 144 1092 0 1088 1 0 1 1 0 8 0 amappl9 136 2526 0 2521 1 0 1 1 0 8 0 amappl8 128 2033 0 2007 1 0 1 1 0 8 0 amappl7 120 1067 0 1059 1 0 1 1 0 8 0 amappl6 112 309 0 300 1 0 1 1 0 8 0 amappl5 104 510 0 495 1 0 1 1 0 8 0 amappl4 96 5549 0 5514 2 1 1 2 0 8 0 amappl3 88 1972 0 1962 1 0 1 1 0 8 0 amappl2 80 43114 0 43041 3 1 2 3 0 8 0 amappl1 72 126737 0 126286 26 16 10 20 0 8 0 amappl 80 16779 0 16738 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 5525 0 5509 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5525 0 5509 1 0 1 1 0 8 0 vmmpekpl 168 42641 0 42602 2 0 2 2 0 8 0 vmmpepl 168 671038 0 669185 282 186 96 109 0 357 9 vmsppl 368 5524 0 5509 2 0 2 2 0 8 0 pdppl 4096 11057 0 11018 7 1 6 6 0 8 0 pvpl 32 1341877 0 1326033 331 165 166 168 0 265 29 pmappl 232 5524 0 5509 3 2 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 626 0 9 18 0 18 18 0 8 0