witness: lock order reversal: 1st 0xfffffd806e1851b0 inode (&ip->i_lock) 2nd 0xfffffd807cb2a808 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+0xd1 sys/kern/kern_rwlock.c:247 #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(fffffd807cb2a808,9,0) at witness_checkorder+0xffc witness_debugger sys/kern/subr_witness.c:2506 [inline] witness_checkorder(fffffd807cb2a808,9,0) at witness_checkorder+0xffc sys/kern/subr_witness.c:1086 rw_enter(fffffd807cb2a7f8,1) at rw_enter+0xd1 sys/kern/kern_rwlock.c:247 diskmapioctl(5a00,c0106477,ffff800020b3b2a0,1,ffff800020a889f8) at diskmapioctl+0x237 sys/dev/diskmap.c:106 VOP_IOCTL(fffffd806fa80648,c0106477,ffff800020b3b2a0,1,fffffd807f7c69c0,ffff800020a889f8) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 vn_ioctl(fffffd80675e3740,c0106477,ffff800020b3b2a0,ffff800020a889f8) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 sys_ioctl(ffff800020a889f8,ffff800020b3b3b8,ffff800020b3b420) at sys_ioctl+0x5b8 syscall(ffff800020b3b490) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800020b3b490) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff1b,0,3,9295dfa3010) at Xsyscall+0x128 end of kernel end trace frame: 0x92c064fc190, count: -9 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800020b3ade0 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800022d8a000 rax 0xffff800000a46a80 r8 0xffffffff816e6485 witness_checkorder+0xfd5 r9 0x5 r10 0x3 r11 0xd8d2417adf54e89 r12 0xfffffd80029bbc00 r13 0 r14 0xffffffff825ffb60 w_lodata+0x48040 r15 0xffffffff8260c0b0 w_lodata+0x54590 rip 0xffffffff81fc9258 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020b3add0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=265056 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=79, nice=20 forw=0xffffffffffffffff, list=0xffff800020a88780,0xffff800020a882a0 process=0xffff800020adca80 user=0xffff800020b36000, vmspace=0xfffffd807f00c8a0 estcpu=29, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 69361 478431 3385 0 2 0 syz-executor.0 69361 132852 3385 0 3 0x4000080 select syz-executor.0 69361 189145 3385 0 2 0x4000000 syz-executor.0 9260 237862 92489 0 7 0 syz-executor.1 * 9260 265056 92489 0 7 0x4000000 syz-executor.1 9260 452421 92489 0 2 0x4000000 syz-executor.1 9260 22633 92489 0 3 0x4000000 inode syz-executor.1 3385 505821 11094 0 3 0x82 nanosleep syz-executor.0 8558 387202 0 0 3 0x14200 bored sosplice 92489 350966 11094 0 3 0x82 nanosleep syz-executor.1 11094 357101 63455 0 3 0x82 thrsleep syz-fuzzer 11094 278967 63455 0 3 0x4000082 thrsleep syz-fuzzer 11094 355938 63455 0 3 0x4000082 thrsleep syz-fuzzer 11094 496446 63455 0 3 0x4000082 thrsleep syz-fuzzer 11094 369760 63455 0 3 0x4000082 thrsleep syz-fuzzer 11094 59953 63455 0 3 0x4000082 thrsleep syz-fuzzer 11094 356291 63455 0 3 0x4000082 kqread syz-fuzzer 11094 28833 63455 0 3 0x4000082 thrsleep syz-fuzzer 11094 452088 63455 0 3 0x4000082 thrsleep syz-fuzzer 11094 480690 63455 0 3 0x4000082 thrsleep syz-fuzzer 63455 519109 42461 0 3 0x10008a pause ksh 42461 195555 74290 0 3 0x92 select sshd 30004 517776 1 0 3 0x100083 ttyin getty 74290 62889 1 0 3 0x80 select sshd 42578 93087 3278 74 3 0x100092 bpf pflogd 3278 5393 1 0 3 0x80 netio pflogd 10116 173983 54870 73 3 0x100090 kqread syslogd 54870 299038 1 0 3 0x100082 netio syslogd 43562 341779 1 77 3 0x100090 poll dhclient 62147 511231 1 0 3 0x80 poll dhclient 41469 313205 0 0 2 0x14200 zerothread 52203 491488 0 0 3 0x14200 aiodoned aiodoned 34857 337435 0 0 3 0x14200 syncer update 63330 452978 0 0 3 0x14200 cleaner cleaner 57282 125424 0 0 3 0x14200 reaper reaper 92913 188534 0 0 3 0x14200 pgdaemon pagedaemon 62300 277577 0 0 3 0x14200 bored crynlk 91857 515991 0 0 3 0x14200 bored crypto 50525 287446 0 0 3 0x40014200 acpi0 acpi0 99348 440007 0 0 3 0x40014200 idle1 66114 273678 0 0 3 0x14200 bored softnet 82357 269005 0 0 3 0x14200 bored systqmp 74263 344051 0 0 3 0x14200 bored systq 5701 307062 0 0 3 0x40014200 bored softclock 8646 313705 0 0 3 0x40014200 idle0 51681 23882 0 0 3 0x14200 bored smr 1 383741 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 69361 (syz-executor.0) thread 0xffff800020a898c8 (189145) exclusive rrwlock inode r = 0 (0xfffffd807ec53d58) #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 vfs_lookup+0xec sys/kern/vfs_lookup.c:418 #6 namei+0x61c sys/kern/vfs_lookup.c:248 #7 vn_open+0xb8 sys/kern/vfs_vnops.c:137 #8 doopenat+0x28e sys/kern/vfs_syscalls.c:1157 #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 Process 9260 (syz-executor.1) thread 0xffff800020a889f8 (265056) exclusive rrwlock inode r = 0 (0xfffffd806e1851b0) #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 (0xffffffff8265b828) #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 Process 9260 (syz-executor.1) thread 0xffff800020a5fb30 (22633) exclusive rwlock fdlock r = 0 (0xfffffd807cb2a808) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 ptmioctl+0xe7 sys/kern/tty_pty.c:1071 #2 VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 #3 vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 #4 sys_ioctl+0x5b8 #5 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #5 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #6 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9516 7041K 7614K 78643K 12446 0 0 pcb 13 8K 8K 78643K 62 0 0 rtable 86 3K 4K 78643K 408 0 0 ifaddr 52 12K 13K 78643K 148 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1508 0 0 iov 0 0K 16K 78643K 93 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1211 76K 77K 78643K 1837 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 11 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 1K 78643K 99 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 6 17K 25K 78643K 753 0 0 sigio 0 0K 0K 78643K 13 0 0 proc 53 50K 71K 78643K 529 0 0 subproc 32 2K 2K 78643K 51 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 59 0 0 in_multi 22 1K 2K 78643K 59 0 0 ether_multi 1 0K 0K 78643K 1 0 0 mrt 0 0K 0K 78643K 2 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 54 238K 238K 78643K 54 0 0 exec 0 0K 1K 78643K 307 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 100 21K 30K 78643K 3307 0 0 UVM aobj 30 2K 2K 78643K 33 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 51 0 0 NDP 11 0K 0K 78643K 41 0 0 temp 162 3554K 4180K 78643K 6233 0 0 kqueue 0 0K 0K 78643K 11 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 8 0 4 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 28 0 26 1 0 1 1 0 8 0 rtentry 112 56 0 23 2 0 2 2 0 8 0 unpcb 120 259 0 249 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 8253 0 8253 1 1 0 1 0 8 0 tcpcb 544 141 0 137 1 0 1 1 0 8 0 inpcb 280 372 0 365 1 0 1 1 0 8 0 nd6 48 9 0 6 1 0 1 1 0 8 0 pkpcb 40 4 0 4 2 2 0 1 0 8 0 swfcl 56 2 0 0 1 0 1 1 0 8 0 ppxss 1128 18 0 18 2 1 1 1 0 8 1 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 28 0 12 1 0 1 1 0 8 0 pfstkey 112 28 0 12 1 0 1 1 0 8 0 pfstate 328 28 0 12 2 0 2 2 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 256 235 0 91 12 2 10 12 0 8 0 art_table 32 236 0 91 2 0 2 2 0 8 0 art_node 16 55 0 25 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 9 1 0 1 1 0 8 0 semapl 112 95 0 85 1 0 1 1 0 8 0 shmpl 112 31 0 3 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2567 0 1145 47 0 47 47 0 8 0 ffsino 272 2567 0 1145 96 0 96 96 0 8 0 nchpl 144 3820 0 2185 62 0 62 62 0 8 0 uvmvnodes 72 3052 0 0 56 0 56 56 0 8 0 vnodes 200 3052 0 0 161 0 161 161 0 8 0 namei 1024 11697 0 11695 2 1 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 1 0 1 1 1 0 1 0 8 0 scxspl 192 10822 0 10822 10 9 1 6 0 8 1 plimitpl 152 93 0 85 1 0 1 1 0 8 0 sigapl 432 950 0 934 3 1 2 3 0 8 0 futexpl 56 9363 0 9363 1 0 1 1 0 8 1 knotepl 112 208 0 189 1 0 1 1 0 8 0 kqueuepl 104 151 0 149 1 0 1 1 0 8 0 pipepl 112 568 0 549 2 1 1 2 0 8 0 fdescpl 488 951 0 934 3 0 3 3 0 8 0 filepl 152 5144 0 5038 7 2 5 6 0 8 0 lockfpl 104 250 0 250 2 1 1 1 0 8 1 lockfspl 48 85 0 85 2 1 1 1 0 8 1 sessionpl 112 19 0 8 1 0 1 1 0 8 0 pgrppl 48 19 0 8 1 0 1 1 0 8 0 ucredpl 96 746 0 737 1 0 1 1 0 8 0 zombiepl 144 934 0 934 2 1 1 1 0 8 1 processpl 896 967 0 934 4 0 4 4 0 8 0 procpl 632 2479 0 2432 6 1 5 5 0 8 1 srpgc 64 4 0 4 1 1 0 1 0 8 0 sosppl 128 4 0 4 2 2 0 1 0 8 0 sockpl 384 674 0 655 4 1 3 3 0 8 1 mcl64k 65536 10 0 0 2 0 2 2 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 6 0 0 1 0 1 1 0 8 0 mcl2k2 2112 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 126 0 0 15 0 15 15 0 8 0 mtagpl 80 18 0 0 1 0 1 1 0 8 0 mbufpl 256 200 0 0 10 0 10 10 0 8 0 bufpl 256 7412 0 1166 391 0 391 391 0 8 0 anonpl 16 94250 0 81743 73 14 59 62 0 124 8 amapchunkpl 152 5160 0 5045 16 6 10 10 0 158 5 amappl16 192 3904 0 3217 46 11 35 43 0 8 0 amappl15 184 357 0 355 1 0 1 1 0 8 0 amappl14 176 412 0 405 1 0 1 1 0 8 0 amappl13 168 356 0 354 2 1 1 1 0 8 0 amappl12 160 17 0 14 1 0 1 1 0 8 0 amappl11 152 60 0 45 1 0 1 1 0 8 0 amappl10 144 76 0 73 1 0 1 1 0 8 0 amappl9 136 606 0 602 1 0 1 1 0 8 0 amappl8 128 173 0 148 2 1 1 2 0 8 0 amappl7 120 42 0 35 1 0 1 1 0 8 0 amappl6 112 59 0 52 1 0 1 1 0 8 0 amappl5 104 177 0 161 1 0 1 1 0 8 0 amappl4 96 1203 0 1172 2 1 1 2 0 8 0 amappl3 88 912 0 896 1 0 1 1 0 8 0 amappl2 80 6634 0 6555 3 1 2 3 0 8 0 amappl1 72 29728 0 29289 26 16 10 20 0 8 0 amappl 80 2752 0 2710 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 32 0 3 1 0 1 1 0 8 0 uaddrrnd 24 951 0 934 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 951 0 934 1 0 1 1 0 8 0 vmmpekpl 168 10205 0 10170 2 0 2 2 0 8 0 vmmpepl 168 120429 0 118516 137 49 88 103 0 357 4 vmsppl 368 950 0 934 2 0 2 2 0 8 0 pdppl 4096 1909 0 1868 7 1 6 6 0 8 0 pvpl 32 288915 0 273138 186 39 147 154 0 265 19 pmappl 232 950 0 934 2 1 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 549 0 7 16 0 16 16 0 8 0