witness: lock order reversal: 1st 0xfffffd80656d9a38 inode (&ip->i_lock) 2nd 0xfffffd807cd86808 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(fffffd807cd86808,9,0) at witness_checkorder+0xffc witness_debugger sys/kern/subr_witness.c:2506 [inline] witness_checkorder(fffffd807cd86808,9,0) at witness_checkorder+0xffc sys/kern/subr_witness.c:1086 rw_enter_write(fffffd807cd867f8) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:125 diskmapioctl(5a00,c0106477,ffff800023b9f410,1,ffff800020a90290) at diskmapioctl+0x237 sys/dev/diskmap.c:106 VOP_IOCTL(fffffd806fa813f0,c0106477,ffff800023b9f410,1,fffffd807f7c6360,ffff800020a90290) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 vn_ioctl(fffffd8065ff2ad0,c0106477,ffff800023b9f410,ffff800020a90290) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 sys_ioctl(ffff800020a90290,ffff800023b9f528,ffff800023b9f590) at sys_ioctl+0x5b8 syscall(ffff800023b9f600) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800023b9f600) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff1b,0,3,87f85d09010) at Xsyscall+0x128 end of kernel end trace frame: 0x8823072c2b0, count: -9 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800023b9efd0 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff800021b60000 rax 0xffff800000a46640 r8 0xffffffff81c43405 witness_checkorder+0xfd5 r9 0x5 r10 0x3 r11 0x95dd121e4d0530b4 r12 0xfffffd80029b9c00 r13 0 r14 0xffffffff825dba10 w_lodata+0x4cbe0 r15 0xffffffff825e3100 w_lodata+0x542d0 rip 0xffffffff8195cff8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800023b9efc0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=411337 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=65, nice=20 forw=0xffffffffffffffff, list=0xffff800020a90018,0xffff800020a918d8 process=0xffff800020adce00 user=0xffff800023b9a000, vmspace=0xfffffd807f00c170 estcpu=15, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 49720 176491 70530 0 2 0 syz-executor.1 *49720 411337 70530 0 7 0x4000000 syz-executor.1 49720 198983 70530 0 3 0x4000080 fsleep syz-executor.1 49720 321446 70530 0 3 0x4000080 fsleep syz-executor.1 70530 308863 62532 0 3 0x82 nanosleep syz-executor.1 40817 160452 62532 0 3 0x82 nanosleep syz-executor.0 62532 224513 56223 0 3 0x82 thrsleep syz-fuzzer 62532 484993 56223 0 3 0x4000082 nanosleep syz-fuzzer 62532 323646 56223 0 3 0x4000082 thrsleep syz-fuzzer 62532 282308 56223 0 3 0x4000082 thrsleep syz-fuzzer 62532 302000 56223 0 3 0x4000082 thrsleep syz-fuzzer 62532 425743 56223 0 3 0x4000082 thrsleep syz-fuzzer 62532 124128 56223 0 3 0x4000082 thrsleep syz-fuzzer 62532 178418 56223 0 3 0x4000082 thrsleep syz-fuzzer 62532 506234 56223 0 3 0x4000082 thrsleep syz-fuzzer 62532 114722 56223 0 3 0x4000082 kqread syz-fuzzer 56223 381998 37638 0 3 0x10008a pause ksh 37638 178250 5540 0 3 0x92 select sshd 28045 35137 1 0 3 0x100083 ttyin getty 5540 231699 1 0 3 0x80 select sshd 64578 188275 43798 74 3 0x100092 bpf pflogd 43798 466952 1 0 3 0x80 netio pflogd 40834 4128 65218 73 3 0x100090 kqread syslogd 65218 64340 1 0 3 0x100082 netio syslogd 30937 303543 1 77 3 0x100090 poll dhclient 79310 281303 1 0 3 0x80 poll dhclient 2820 502841 0 0 3 0x14200 pgzero zerothread 58961 459020 0 0 3 0x14200 aiodoned aiodoned 45563 103203 0 0 3 0x14200 syncer update 55277 36188 0 0 3 0x14200 cleaner cleaner 62957 452012 0 0 7 0x14200 reaper 91730 176676 0 0 3 0x14200 pgdaemon pagedaemon 9755 493083 0 0 3 0x14200 bored crynlk 1815 417944 0 0 3 0x14200 bored crypto 15341 430141 0 0 3 0x40014200 acpi0 acpi0 74333 328181 0 0 3 0x40014200 idle1 21503 307490 0 0 3 0x14200 bored softnet 11175 176144 0 0 3 0x14200 bored systqmp 18070 274237 0 0 3 0x14200 bored systq 30081 97707 0 0 3 0x40014200 bored softclock 25072 244364 0 0 3 0x40014200 idle0 58984 172989 0 0 3 0x14200 bored smr 1 141049 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 49720 (syz-executor.1) thread 0xffff800020a90290 (411337) exclusive rrwlock inode r = 0 (0xfffffd80656d9a38) #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 (0xffffffff826445e0) #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 9476 6392K 6778K 78643K 10827 0 0 pcb 13 8K 8K 78643K 31 0 0 rtable 108 4K 4K 78643K 242 0 0 ifaddr 44 11K 11K 78643K 64 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1472 0 0 iov 0 0K 12K 78643K 22 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1220 77K 77K 78643K 1321 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 3 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 8 0K 0K 78643K 8 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 5 13K 25K 78643K 141 0 0 proc 53 50K 83K 78643K 422 0 0 subproc 32 2K 2K 78643K 34 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 ip_moptions 2 0K 0K 78643K 13 0 0 in_multi 34 2K 2K 78643K 34 0 0 ether_multi 1 0K 0K 78643K 1 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 48 212K 212K 78643K 48 0 0 exec 0 0K 1K 78643K 213 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 105 21K 22K 78643K 1362 0 0 UVM aobj 4 2K 2K 78643K 4 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 9 0 0 NDP 7 0K 0K 78643K 16 0 0 temp 99 3545K 3609K 78643K 4093 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 6 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 27 0 25 1 0 1 1 0 8 0 rtentry 112 47 0 3 2 0 2 2 0 8 0 unpcb 120 41 0 31 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 9770 0 9770 3 3 0 2 0 8 0 tcpcb 544 36 0 32 1 0 1 1 0 8 0 inpcb 280 108 0 100 1 0 1 1 0 8 0 nd6 48 6 0 0 1 0 1 1 0 8 0 ppxss 1128 3 0 3 1 0 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 18 0 3 1 0 1 1 0 8 0 pfstkey 112 18 0 3 1 0 1 1 0 8 0 pfstate 328 18 0 2 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 256 188 0 0 12 0 12 12 0 8 0 art_table 32 189 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 semapl 112 6 0 0 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1631 0 201 47 0 47 47 0 8 0 ffsino 272 1631 0 201 96 0 96 96 0 8 0 nchpl 144 2026 0 377 62 0 62 62 0 8 0 uvmvnodes 72 1733 0 0 32 0 32 32 0 8 0 vnodes 200 1733 0 0 92 0 92 92 0 8 0 namei 1024 5563 0 5563 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 5175 0 5175 9 8 1 7 0 8 1 plimitpl 152 25 0 17 1 0 1 1 0 8 0 sigapl 432 341 0 326 3 1 2 3 0 8 0 futexpl 56 1492 0 1490 1 0 1 1 0 8 0 knotepl 112 58 0 39 1 0 1 1 0 8 0 kqueuepl 104 18 0 16 1 0 1 1 0 8 0 pipepl 112 226 0 207 1 0 1 1 0 8 0 fdescpl 488 342 0 326 3 0 3 3 0 8 0 filepl 152 1812 0 1708 6 1 5 5 0 8 0 lockfpl 104 26 0 26 2 1 1 1 0 8 1 lockfspl 48 11 0 11 2 1 1 1 0 8 1 sessionpl 112 18 0 7 1 0 1 1 0 8 0 pgrppl 48 18 0 7 1 0 1 1 0 8 0 ucredpl 96 229 0 220 1 0 1 1 0 8 0 zombiepl 144 326 0 325 2 1 1 1 0 8 0 processpl 896 357 0 325 4 0 4 4 0 8 0 procpl 632 591 0 547 4 0 4 4 0 8 0 sockpl 384 176 0 156 4 1 3 3 0 8 1 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 225 0 0 25 0 25 25 0 8 0 mtagpl 80 4 0 0 1 0 1 1 0 8 0 mbufpl 256 272 0 0 15 0 15 15 0 8 0 bufpl 256 5863 0 1168 294 0 294 294 0 8 0 anonpl 16 42166 0 30517 50 1 49 49 0 124 2 amapchunkpl 152 1753 0 1612 9 2 7 8 0 158 1 amappl16 192 1172 0 553 32 0 32 32 0 8 1 amappl15 184 8 0 7 1 0 1 1 0 8 0 amappl14 176 52 0 46 1 0 1 1 0 8 0 amappl13 168 8 0 8 1 1 0 1 0 8 0 amappl12 160 14 0 13 1 0 1 1 0 8 0 amappl11 152 119 0 101 1 0 1 1 0 8 0 amappl10 144 128 0 122 1 0 1 1 0 8 0 amappl9 136 596 0 593 1 0 1 1 0 8 0 amappl8 128 142 0 124 1 0 1 1 0 8 0 amappl7 120 91 0 86 1 0 1 1 0 8 0 amappl6 112 109 0 100 1 0 1 1 0 8 0 amappl5 104 135 0 122 1 0 1 1 0 8 0 amappl4 96 596 0 568 1 0 1 1 0 8 0 amappl3 88 178 0 167 1 0 1 1 0 8 0 amappl2 80 1820 0 1740 3 1 2 3 0 8 0 amappl1 72 17409 0 16941 26 16 10 20 0 8 0 amappl 80 853 0 805 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 342 0 326 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 342 0 326 1 0 1 1 0 8 0 vmmpekpl 168 6728 0 6696 2 0 2 2 0 8 0 vmmpepl 168 47666 0 45825 129 32 97 99 0 357 15 vmsppl 368 341 0 325 2 0 2 2 0 8 0 pdppl 4096 691 0 650 7 1 6 6 0 8 0 pvpl 32 147552 0 132806 144 18 126 126 0 265 4 pmappl 232 341 0 325 2 1 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 465 0 5 14 0 14 14 0 8 0