witness: lock order reversal: 1st 0xfffffd806e0846f8 inode (&ip->i_lock) 2nd 0xfffffd806e78d438 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(fffffd806e78d438,9,0) at witness_checkorder+0xffc witness_debugger sys/kern/subr_witness.c:2506 [inline] witness_checkorder(fffffd806e78d438,9,0) at witness_checkorder+0xffc sys/kern/subr_witness.c:1086 rw_enter_write(fffffd806e78d428) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:125 diskmapioctl(5a00,c0106477,ffff800021b87320,1,ffff800020abf650) at diskmapioctl+0x237 sys/dev/diskmap.c:106 VOP_IOCTL(fffffd806fa7a4b8,c0106477,ffff800021b87320,1,fffffd807f7c6780,ffff800020abf650) at VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290 vn_ioctl(fffffd80789a8130,c0106477,ffff800021b87320,ffff800020abf650) at vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524 sys_ioctl(ffff800020abf650,ffff800021b87438,ffff800021b874a0) at sys_ioctl+0x5b8 syscall(ffff800021b87510) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800021b87510) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,ffffffffffffff1b,0,3,69f9af9b010) at Xsyscall+0x128 end of kernel end trace frame: 0x6a26d36e020, count: -9 ddb{0}> show registers rdi 0x3 rsi 0x3ffff acpi_pdirpa+0x2be67 rbp 0xffff800021b86ee0 rbx 0x3 rdx 0x40000 acpi_pdirpa+0x2be68 rcx 0xffff80002113a000 rax 0xffff800000a45740 r8 0xffffffff82037435 witness_checkorder+0xfd5 r9 0x5 r10 0x3 r11 0x18db1086a6429d8e r12 0xfffffd80029b8c00 r13 0 r14 0xffffffff825ff140 w_lodata+0x3a9c0 r15 0xffffffff82618790 w_lodata+0x54010 rip 0xffffffff81b1dce8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021b86ed0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=489908 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=80, nice=20 forw=0xffffffffffffffff, list=0xffff800020abe508,0xffff800020abe790 process=0xffff800020add180 user=0xffff800021b82000, vmspace=0xfffffd807f00ca10 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 70465 453728 59666 0 7 0 syz-executor.1 *70465 489908 59666 0 7 0x4000000 syz-executor.1 70465 175450 59666 0 2 0x4000000 syz-executor.1 70465 235961 59666 0 3 0x4000080 fsleep syz-executor.1 60603 517998 14985 0 3 0x80 nanosleep syz-executor.0 60603 30001 14985 0 3 0x4000080 nanosleep syz-executor.0 60603 93841 14985 0 3 0x4000080 nanosleep syz-executor.0 60603 167530 14985 0 3 0x4000080 fsleep syz-executor.0 60603 135161 14985 0 3 0x4000080 fsleep syz-executor.0 14985 198790 8186 0 3 0x82 nanosleep syz-executor.0 59666 88150 8186 0 3 0x82 nanosleep syz-executor.1 15861 307846 1 0 3 0x100083 ttyin getty 36060 353075 0 0 3 0x14200 acct acct 10128 450521 0 0 3 0x14200 bored sosplice 8186 213549 33483 0 3 0x82 thrsleep syz-fuzzer 8186 376146 33483 0 3 0x4000082 thrsleep syz-fuzzer 8186 17906 33483 0 3 0x4000082 thrsleep syz-fuzzer 8186 167781 33483 0 3 0x4000082 thrsleep syz-fuzzer 8186 211375 33483 0 3 0x4000082 thrsleep syz-fuzzer 8186 239213 33483 0 3 0x4000082 thrsleep syz-fuzzer 8186 268208 33483 0 3 0x4000082 thrsleep syz-fuzzer 8186 208890 33483 0 3 0x4000082 kqread syz-fuzzer 8186 188366 33483 0 3 0x4000082 thrsleep syz-fuzzer 8186 84181 33483 0 3 0x4000082 thrsleep syz-fuzzer 33483 265576 96537 0 3 0x10008a pause ksh 96537 308390 48481 0 3 0x92 select sshd 48481 355450 1 0 3 0x80 select sshd 10581 227528 87955 74 3 0x100092 bpf pflogd 87955 221986 1 0 3 0x80 netio pflogd 92829 135284 74469 73 3 0x100090 kqread syslogd 74469 25333 1 0 3 0x100082 netio syslogd 70305 492087 0 0 3 0x14200 pgzero zerothread 83524 292643 0 0 3 0x14200 aiodoned aiodoned 25814 323108 0 0 3 0x14200 syncer update 59533 435928 0 0 3 0x14200 cleaner cleaner 65118 33137 0 0 3 0x14200 reaper reaper 46200 346040 0 0 3 0x14200 pgdaemon pagedaemon 98999 365347 0 0 3 0x14200 bored crynlk 14711 212340 0 0 3 0x14200 bored crypto 76660 223888 0 0 3 0x40014200 acpi0 acpi0 8480 501658 0 0 3 0x40014200 idle1 58877 295217 0 0 3 0x14200 bored softnet 70806 323344 0 0 3 0x14200 bored systqmp 69082 472563 0 0 3 0x14200 bored systq 17516 328311 0 0 3 0x40014200 bored softclock 89312 409334 0 0 3 0x40014200 idle0 17268 149061 0 0 3 0x14200 bored smr 1 30895 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 70465 (syz-executor.1) thread 0xffff800020abf650 (489908) exclusive rrwlock inode r = 0 (0xfffffd806e0846f8) #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 (0xffffffff8263fbb8) #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 9615 6414K 10897K 78643K 40090 0 0 pcb 13 8K 8K 78643K 1344 0 0 rtable 113 4K 5K 78643K 3683 0 0 ifaddr 90 24K 28K 78643K 1335 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 2103 0 0 iov 0 0K 32K 78643K 1052 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1199 75K 77K 78643K 11728 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 177 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 12 0K 1K 78643K 1420 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 6 17K 25K 78643K 11709 0 0 sigio 0 0K 0K 78643K 166 0 0 proc 54 51K 83K 78643K 3144 0 0 subproc 32 2K 2K 78643K 707 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 1019 0 0 in_multi 33 2K 2K 78643K 828 0 0 ether_multi 1 0K 0K 78643K 53 0 0 mrt 0 0K 0K 78643K 47 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 114 503K 503K 78643K 114 0 0 exec 0 0K 1K 78643K 1681 0 0 pfkey data 0 0K 1K 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 118 22K 32K 78643K 39037 0 0 UVM aobj 130 5K 5K 78643K 140 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 1267 0 0 NDP 22 0K 1K 78643K 416 0 0 temp 243 3557K 3637K 78643K 151055 0 0 kqueue 0 0K 0K 78643K 89 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 92 0 85 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 591 0 591 1 0 1 1 0 8 1 rtentry 112 493 0 448 2 0 2 2 0 8 0 unpcb 120 3708 0 3700 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 7718 0 7718 1 1 0 1 0 8 0 tcpcb 544 2272 0 2268 1 0 1 1 0 8 0 inpcb 280 6750 0 6744 19 18 1 2 0 8 0 rttmr 72 8 0 8 6 6 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 48 123 0 117 1 0 1 1 0 8 0 pkpcb 40 73 0 73 24 24 0 1 0 8 0 swfcl 56 7 0 0 1 0 1 1 0 8 0 ppxss 1128 222 0 222 31 30 1 1 0 8 1 pffrag 232 17 0 17 11 11 0 1 0 482 0 pffrnode 88 17 0 17 11 11 0 1 0 8 0 pffrent 40 38 0 38 11 11 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 24 316 0 284 1 0 1 1 0 8 0 pfstkey 112 318 0 286 2 0 2 2 0 8 0 pfstate 328 318 0 285 4 1 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 2042 0 1846 18 5 13 14 0 8 0 art_table 32 2043 0 1846 2 0 2 2 0 8 0 art_node 16 489 0 448 1 0 1 1 0 8 0 sysvmsgpl 40 21 0 14 1 0 1 1 0 8 0 semapl 112 1418 0 1408 1 0 1 1 0 8 0 shmpl 112 138 0 10 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 18908 0 17444 48 0 48 48 0 8 0 ffsino 272 18908 0 17444 99 1 98 98 0 8 0 nchpl 144 35491 0 33853 62 0 62 62 0 8 0 uvmvnodes 72 6753 0 0 123 0 123 123 0 8 0 vnodes 200 6753 0 0 356 0 356 356 0 8 0 namei 1024 116034 0 116034 3 2 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scsiplug 64 9 0 9 7 7 0 1 0 8 0 scxspl 192 103671 0 103671 38 37 1 7 0 8 1 plimitpl 152 1143 0 1136 1 0 1 1 0 8 0 sigapl 432 11800 0 11786 5 3 2 3 0 8 0 futexpl 56 149685 0 149682 2 1 1 1 0 8 0 knotepl 112 2388 0 2369 1 0 1 1 0 8 0 kqueuepl 104 2164 0 2162 1 0 1 1 0 8 0 pipepl 112 6474 0 6455 10 9 1 2 0 8 0 fdescpl 488 11801 0 11786 3 0 3 3 0 8 0 filepl 152 69337 0 69243 21 17 4 7 0 8 0 lockfpl 104 3546 0 3546 3 2 1 1 0 8 1 lockfspl 48 1211 0 1211 3 2 1 1 0 8 1 sessionpl 112 65 0 56 1 0 1 1 0 8 0 pgrppl 48 185 0 176 1 0 1 1 0 8 0 ucredpl 96 12701 0 12692 1 0 1 1 0 8 0 zombiepl 144 11792 0 11792 2 1 1 1 0 8 1 processpl 896 11824 0 11792 6 2 4 5 0 8 0 procpl 632 36324 0 36276 10 5 5 6 0 8 0 srpgc 64 86 0 86 33 33 0 1 0 8 0 sosppl 128 156 0 156 28 27 1 1 0 8 1 sockpl 384 11247 0 11235 14 12 2 4 0 8 0 mcl64k 65536 34 0 0 3 0 3 3 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 33 0 0 2 0 2 2 0 8 0 mcl9k 9216 33 0 0 2 0 2 2 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 18 0 0 3 0 3 3 0 8 0 mcl2k2 2112 8 0 0 1 0 1 1 0 8 0 mcl2k 2048 194 0 0 23 5 18 23 0 8 0 mtagpl 80 65 0 0 1 0 1 1 0 8 0 mbufpl 256 889 0 0 32 3 29 29 0 8 0 bufpl 256 32598 0 25579 439 0 439 439 0 8 0 anonpl 16 1023165 0 1010365 236 180 56 70 0 124 0 amapchunkpl 152 70644 0 70530 57 51 6 12 0 158 0 amappl16 192 55695 0 54959 247 209 38 49 0 8 1 amappl15 184 24 0 24 3 3 0 1 0 8 0 amappl14 176 2030 0 2024 1 0 1 1 0 8 0 amappl13 168 3650 0 3649 6 5 1 1 0 8 0 amappl12 160 1466 0 1461 2 1 1 1 0 8 0 amappl11 152 1545 0 1537 1 0 1 1 0 8 0 amappl10 144 1416 0 1411 1 0 1 1 0 8 0 amappl9 136 2450 0 2445 1 0 1 1 0 8 0 amappl8 128 1966 0 1930 2 0 2 2 0 8 0 amappl7 120 1425 0 1415 1 0 1 1 0 8 0 amappl6 112 1447 0 1438 1 0 1 1 0 8 0 amappl5 104 1911 0 1898 1 0 1 1 0 8 0 amappl4 96 12352 0 12323 2 1 1 2 0 8 0 amappl3 88 2929 0 2918 1 0 1 1 0 8 0 amappl2 80 91388 0 91316 3 1 2 3 0 8 0 amappl1 72 265852 0 265413 27 17 10 20 0 8 0 amappl 80 37201 0 37161 2 0 2 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 64 139 0 10 3 0 3 3 0 8 0 uaddrrnd 24 11801 0 11786 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 11801 0 11786 1 0 1 1 0 8 0 vmmpekpl 168 93647 0 93611 3 0 3 3 0 8 0 vmmpepl 168 1434465 0 1432533 464 378 86 114 0 357 1 vmsppl 368 11800 0 11786 2 0 2 2 0 8 0 pdppl 4096 23609 0 23572 7 1 6 6 0 8 0 pvpl 32 2791245 0 2774681 558 420 138 175 0 265 3 pmappl 232 11800 0 11786 4 3 1 2 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 644 0 20 18 0 18 18 0 8 0