login: witness: lock order reversal: 1st 0xfffffd806d8bc5f8 inode (&ip->i_lock) 2nd 0xfffffd806e6d7438 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:556 [inline] #4 vn_closefile+0x119 vn_close sys/kern/vfs_vnops.c:288 [inline] #4 vn_closefile+0x119 sys/kern/vfs_vnops.c:582 #5 fdrop+0xc9 sys/kern/kern_descrip.c:1269 #6 closef+0x11d sys/kern/kern_descrip.c:1253 #7 finishdup+0x2b6 sys/kern/kern_descrip.c:682 #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 doopenat+0x610 sys/kern/vfs_syscalls.c:1214 #3 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] #3 syscall+0x552 sys/arch/amd64/amd64/trap.c:555 #4 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(fffffd806e6d7438,9,0) at witness_checkorder+0xffc witness_debugger sys/kern/subr_witness.c:2506 [inline] witness_checkorder(fffffd806e6d7438,9,0) at witness_checkorder+0xffc sys/kern/subr_witness.c:1086 rw_enter_write(fffffd806e6d7428) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:125 doopenat(ffff800020b28c70,ffffff9c,200000c0,0,0,ffff800020be1b20) at doopenat+0x610 sys/kern/vfs_syscalls.c:1214 syscall(ffff800020be1b90) at syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800020be1b90) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555 Xsyscall(6,0,840a1110138,0,840a1110118,840a1110110) at Xsyscall+0x128 end of kernel end trace frame: 0x84381170600, count: -6 ddb{1}> show registers rdi 0x3 rsi 0xffffffff821bcce0 __sancov_gen_cov_switch_values.122 rbp 0xffff800020be1760 rbx 0x3 rdx 0x8b rcx 0x3 rax 0x3 r8 0xffffffff8111ee15 witness_checkorder+0xfd5 r9 0x5 r10 0x88e1117e8bfeb5c8 r11 0x1678a6a2d3a6fa57 r12 0xfffffd800267ac00 r13 0 r14 0xffffffff822fe490 w_lodata+0x4ec30 r15 0xffffffff82303b30 w_lodata+0x542d0 rip 0xffffffff81e3a658 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020be1750 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor0169) pid=342021 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020b618c0,0xffff800020b28a08 process=0xffff800020b7d880 user=0xffff800020bdc000, vmspace=0xfffffd807effd8a0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 81008 82046 96471 0 7 0 syz-executor0169 81008 69170 96471 0 2 0x4000000 syz-executor0169 43928 2261 3641 0 3 0x80 nanosleep syz-executor0169 43928 268085 3641 0 3 0x4000080 fsleep syz-executor0169 43928 265857 3641 0 3 0x4000080 fsleep syz-executor0169 *43928 342021 3641 0 7 0x4000000 syz-executor0169 96471 261132 14729 0 3 0x80 nanosleep syz-executor0169 3641 473323 14729 0 3 0x80 nanosleep syz-executor0169 14729 187301 36509 0 3 0x82 nanosleep syz-executor0169 36509 129435 78283 0 3 0x10008a pause ksh 78283 370707 9578 0 3 0x92 select sshd 41635 96045 1 0 3 0x100083 ttyin getty 9578 4989 1 0 3 0x80 select sshd 55481 311226 90345 74 3 0x100092 bpf pflogd 90345 121153 1 0 3 0x80 netio pflogd 2572 163714 51853 73 3 0x100090 kqread syslogd 51853 204266 1 0 3 0x100082 netio syslogd 90373 304658 1 77 3 0x100090 poll dhclient 60751 429965 1 0 3 0x80 poll dhclient 77541 325038 0 0 3 0x14200 pgzero zerothread 56350 22830 0 0 3 0x14200 aiodoned aiodoned 13133 57463 0 0 3 0x14200 syncer update 76653 471411 0 0 3 0x14200 cleaner cleaner 11474 479753 0 0 3 0x14200 reaper reaper 79086 352619 0 0 3 0x14200 pgdaemon pagedaemon 25198 361860 0 0 3 0x14200 bored crynlk 87097 189584 0 0 3 0x14200 bored crypto 88125 123357 0 0 3 0x40014200 acpi0 acpi0 2890 263499 0 0 3 0x40014200 idle1 34870 120230 0 0 3 0x14200 bored softnet 60104 291797 0 0 3 0x14200 bored systqmp 59685 287726 0 0 3 0x14200 bored systq 9279 511458 0 0 3 0x40014200 bored softclock 93853 427659 0 0 3 0x40014200 idle0 22521 407886 0 0 3 0x14200 bored smr 1 449830 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 43928 (syz-executor0169) thread 0xffff800020b28c70 (342021) exclusive rrwlock inode r = 0 (0xfffffd806d8bc5f8) #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:556 #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 doopenat+0x28e sys/kern/vfs_syscalls.c:1145 #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 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82363690) #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:556 #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 doopenat+0x28e sys/kern/vfs_syscalls.c:1145 #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9454 6383K 6384K 78643K 10541 0 0 pcb 13 8K 8K 78643K 13 0 0 rtable 61 2K 2K 78643K 125 0 0 ifaddr 25 7K 7K 78643K 26 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1467 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1181 74K 74K 78643K 1462 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 1K 78643K 2 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 2 0K 0K 78643K 2 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 3 4K 5K 78643K 1048 0 0 proc 52 50K 58K 78643K 334 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 in_multi 11 0K 0K 78643K 11 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 30 132K 132K 78643K 30 0 0 exec 0 0K 1K 78643K 179 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 70 3K 3K 78643K 1885 0 0 UVM aobj 2 2K 2K 78643K 2 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 NDP 4 0K 0K 78643K 4 0 0 temp 39 2728K 2792K 78643K 1993 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 2 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 15 0 13 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 120 29 0 19 1 0 1 1 0 8 0 syncache 264 5 0 5 2 1 1 1 0 8 1 tcpcb 544 8 0 5 1 0 1 1 0 8 0 inpcb 280 29 0 23 1 0 1 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 8 0 6 2 1 1 1 0 8 0 pfstkey 112 8 0 6 2 1 1 1 0 8 0 pfstate 328 8 0 6 2 1 1 1 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 96 0 0 6 0 6 6 0 8 0 art_table 32 97 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1859 0 476 45 0 45 45 0 8 0 ffsino 272 1859 0 476 93 0 93 93 0 8 0 nchpl 144 1984 0 443 58 0 58 58 0 8 0 uvmvnodes 72 1869 0 0 34 0 34 34 0 8 0 vnodes 200 1869 0 0 99 0 99 99 0 8 0 namei 1024 6083 0 6083 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 3070 0 3070 32 31 1 6 0 8 1 plimitpl 152 14 0 8 1 0 1 1 0 8 0 sigapl 432 556 0 540 2 0 2 2 0 8 0 futexpl 56 1214 0 1212 1 0 1 1 0 8 0 knotepl 112 5 0 0 1 0 1 1 0 8 0 kqueuepl 104 1 0 0 1 0 1 1 0 8 0 pipepl 112 134 0 127 2 1 1 1 0 8 0 fdescpl 488 557 0 540 3 0 3 3 0 8 0 filepl 152 2377 0 2325 3 0 3 3 0 8 0 lockfpl 104 6 0 6 1 1 0 1 0 8 0 lockfspl 48 3 0 3 1 1 0 1 0 8 0 sessionpl 112 18 0 9 1 0 1 1 0 8 0 pgrppl 48 18 0 9 1 0 1 1 0 8 0 ucredpl 96 1099 0 1090 1 0 1 1 0 8 0 zombiepl 144 540 0 540 2 1 1 1 0 8 1 processpl 896 572 0 540 4 0 4 4 0 8 0 procpl 632 941 0 905 4 0 4 4 0 8 0 sockpl 384 73 0 55 2 0 2 2 0 8 0 mcl4k 4096 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 88 0 0 10 0 10 10 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 101 0 0 6 0 6 6 0 8 0 bufpl 256 2175 0 276 119 0 119 119 0 8 0 anonpl 16 34263 0 32906 7 1 6 7 0 125 0 amapchunkpl 152 1626 0 1577 3 0 3 3 0 158 0 amappl16 192 435 0 428 1 0 1 1 0 8 0 amappl14 176 38 0 34 1 0 1 1 0 8 0 amappl12 160 4 0 4 1 1 0 1 0 8 0 amappl11 152 46 0 31 1 0 1 1 0 8 0 amappl10 144 60 0 57 1 0 1 1 0 8 0 amappl9 136 435 0 434 1 0 1 1 0 8 0 amappl8 128 451 0 442 1 0 1 1 0 8 0 amappl7 120 19 0 17 1 0 1 1 0 8 0 amappl6 112 45 0 41 1 0 1 1 0 8 0 amappl5 104 125 0 112 1 0 1 1 0 8 0 amappl4 96 475 0 447 1 0 1 1 0 8 0 amappl3 88 155 0 144 1 0 1 1 0 8 0 amappl2 80 3975 0 3902 2 0 2 2 0 8 0 amappl1 72 19519 0 19058 16 6 10 16 0 8 0 amappl 80 1141 0 1112 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 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 557 0 540 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 557 0 540 1 0 1 1 0 8 0 vmmpekpl 168 7052 0 7031 2 0 2 2 0 8 0 vmmpepl 168 51294 0 50300 57 13 44 52 0 357 0 vmsppl 368 556 0 540 2 0 2 2 0 8 0 pdppl 4096 1122 0 1080 6 0 6 6 0 8 0 pvpl 32 110653 0 107446 28 0 28 28 0 265 0 pmappl 232 556 0 540 1 0 1 1 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 254 0 4 8 0 8 8 0 8 0