login: witness: lock order reversal: 1st 0xfffffd8076bd6638 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd80775681b8 inode (&ip->i_lock) lock order data w2 -> w1 missing lock order data w1 -> w2 missing 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(fffffd80775681b8,9,0) at witness_checkorder+0x108b rw_enter(fffffd80775681a8,1) at rw_enter+0xd4 rrw_enter(fffffd80775681a8,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd80776cb4a8,2001) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd80776cb4a8,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 vget(fffffd80776cb4a8,2001) at vget+0x1f7 sys/kern/vfs_subr.c:676 ktrwriteraw(ffff800024343a50,fffffd80776cb4a8,fffffd807f7d8a20,ffff800024371d20,ffff800024371d00) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff800024343a50,ffffffff823ba727,ffff800024371e08,8) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff800024343a50,ffffffff823ba727,ffff800024371e08,8) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_socketpair(ffff800024343a50,ffff800024371e78,ffff800024371ec0) at sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 syscall(ffff800024371f40) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800024371f40) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:590 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x88f78dfcf00, count: -12 ddb{0}> show registers rdi 0xffff8000222ac000 rsi 0x18530 acpi_pdirpa+0x4398 rbp 0xffff800024371930 rbx 0x3 rdx 0xffff8000222ac000 rcx 0x1852f acpi_pdirpa+0x4397 rax 0xffffffff81ea0557 db_enter+0x17 r8 0xffffffff81edf4f1 witness_checkorder+0x1061 r9 0x5 r10 0x1f003e45e6d3af16 r11 0xcfc0b91072895db1 r12 0 r13 0xfffffd80775681b8 r14 0 r15 0xfffffd8002cf96c0 rip 0xffffffff81ea0558 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800024371920 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=60982 stat=onproc flags process=0 proc=4000001 pri=75, usrpri=75, nice=20 forw=0xffffffffffffffff, list=0xffff800024342a90,0xffffffff8282e518 process=0xffff800024315da0 user=0xffff80002436c000, vmspace=0xfffffd80084d6cf0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 90727 54176 83454 0 2 0 syz-executor.1 *90727 60982 83454 0 7 0x4000001 syz-executor.1 98839 100368 1533 60929 7 0x11 syz-executor.0 98839 64320 1533 60929 2 0x4000010 syz-executor.0 1533 165043 30446 0 3 0x82 nanoslp syz-executor.0 83454 353367 30446 0 3 0x82 nanoslp syz-executor.1 62624 496853 1 0 3 0x100083 ttyin getty 95823 509828 0 0 3 0x14200 bored sosplice 6990 362423 0 0 3 0x14280 nfsidl nfsio 48383 486743 0 0 3 0x14280 nfsidl nfsio 15452 75405 0 0 3 0x14280 nfsidl nfsio 1682 371907 0 0 3 0x14280 nfsidl nfsio 32576 432689 0 0 3 0x14280 nfsidl nfsio 5006 485507 0 0 3 0x14280 nfsidl nfsio 29649 285842 0 0 3 0x14280 nfsidl nfsio 98706 133967 0 0 3 0x14280 nfsidl nfsio 13591 71269 0 0 3 0x14280 nfsidl nfsio 2160 31666 0 0 3 0x14280 nfsidl nfsio 75850 119920 0 0 3 0x14280 nfsidl nfsio 41431 428928 0 0 3 0x14280 nfsidl nfsio 18215 470204 0 0 3 0x14280 nfsidl nfsio 58672 447432 0 0 3 0x14280 nfsidl nfsio 42886 22953 0 0 3 0x14280 nfsidl nfsio 53930 42051 0 0 3 0x14280 nfsidl nfsio 72563 371568 0 0 3 0x14280 nfsidl nfsio 50662 250356 0 0 3 0x14280 nfsidl nfsio 97980 64296 0 0 3 0x14280 nfsidl nfsio 50927 123778 0 0 3 0x14280 nfsidl nfsio 30446 485631 30246 0 3 0x82 thrsleep syz-fuzzer 30446 214154 30246 0 3 0x4000082 thrsleep syz-fuzzer 30446 496365 30246 0 3 0x4000082 kqread syz-fuzzer 30446 12307 30246 0 3 0x4000082 thrsleep syz-fuzzer 30446 16736 30246 0 3 0x4000082 thrsleep syz-fuzzer 30446 51329 30246 0 3 0x4000082 thrsleep syz-fuzzer 30446 299809 30246 0 3 0x4000082 thrsleep syz-fuzzer 30446 442808 30246 0 3 0x4000082 thrsleep syz-fuzzer 30246 86988 5278 0 3 0x10008a sigsusp ksh 5278 414351 68691 0 3 0x92 select sshd 68691 46176 1 0 3 0x80 select sshd 31021 357089 93698 74 3 0x100092 bpf pflogd 93698 350101 1 0 3 0x80 netio pflogd 85371 434285 41940 73 3 0x100090 kqread syslogd 41940 385937 1 0 3 0x100082 netio syslogd 19213 51246 1 77 3 0x100090 poll dhclient 86511 118764 1 0 3 0x80 poll dhclient 75476 371952 0 0 3 0x14200 bored smr 45997 167249 0 0 2 0x14200 zerothread 21684 158635 0 0 3 0x14200 aiodoned aiodoned 94564 318533 0 0 3 0x14200 syncer update 23189 309033 0 0 3 0x14200 cleaner cleaner 52562 165495 0 0 3 0x14200 reaper reaper 77256 464243 0 0 3 0x14200 pgdaemon pagedaemon 65748 66084 0 0 3 0x14200 bored crynlk 21456 247299 0 0 3 0x14200 bored crypto 56777 198939 0 0 3 0x14200 bored viomb 51765 307814 0 0 3 0x40014200 acpi0 acpi0 23609 64389 0 0 3 0x40014200 idle1 75452 225083 0 0 3 0x14200 bored softnet 21452 96657 0 0 3 0x14200 bored systqmp 79196 114838 0 0 3 0x14200 bored systq 37917 451148 0 0 3 0x40014200 bored softclock 10706 491083 0 0 3 0x40014200 idle0 1 151071 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 90727 (syz-executor.1) thread 0xffff800024343a50 (60982) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82797ce0) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 ktrstruct+0xee #2 sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 #3 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x5bf sys/arch/amd64/amd64/trap.c:590 #4 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xfffffd8076bd6638) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 sys_socketpair+0x219 #2 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] #2 syscall+0x5bf sys/arch/amd64/amd64/trap.c:590 #3 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10172 6497K 7197K 78643K 13265 0 pcb 13 8K 8K 78643K 104 0 rtable 107 3K 3K 78643K 386 0 ifaddr 73 13K 14K 78643K 114 0 sysctl 2 0K 0K 78643K 2 0 counters 44 34K 34K 78643K 60 0 ioctlops 0 0K 4K 78643K 1505 0 iov 0 0K 12K 78643K 57 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 1 0 vnodes 1219 77K 77K 78643K 1936 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 16 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 62 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 6 17K 25K 78643K 1928 0 sigio 0 0K 0K 78643K 5 0 proc 63 63K 83K 78643K 758 0 subproc 32 2K 2K 78643K 68 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 115 0 in_multi 33 2K 2K 78643K 142 0 ether_multi 1 0K 0K 78643K 30 0 mrt 0 0K 0K 78643K 36 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 43 201K 201K 78643K 43 0 exec 0 0K 2K 78643K 425 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 221 94K 94K 78643K 24258 0 UVM aobj 27 2K 2K 78643K 27 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 73 0 NDP 13 0K 0K 78643K 29 0 temp 134 3982K 4046K 78643K 28032 0 kqueue 3 4K 12K 78643K 127 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 120 53 0 51 1 0 1 1 0 8 0 rtentry 112 83 0 38 2 0 2 2 0 8 0 unpcb 120 410 0 394 1 0 1 1 0 8 0 syncache 296 25 0 25 4 4 0 1 0 8 0 tcpqe 32 252 0 252 3 3 0 1 0 8 0 tcpcb 736 320 0 308 7 4 3 4 0 8 1 arp 120 10 0 4 1 0 1 1 0 8 0 inpcb 304 813 0 804 3 1 2 2 0 8 1 rttmr 72 19 0 19 2 2 0 1 0 8 0 nd6 48 13 0 6 1 0 1 1 0 8 0 pkpcb 40 20 0 20 4 4 0 1 0 8 0 kcovpl 48 4 0 2 1 0 1 1 0 8 0 pffrag 232 3 0 3 1 1 0 1 0 482 0 pffrnode 88 3 0 3 1 1 0 1 0 8 0 pffrent 40 6 0 6 1 1 0 1 0 8 0 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 26 0 16 1 0 1 1 0 8 0 pfstkey 112 26 0 16 1 0 1 1 0 8 0 pfstate 320 26 0 16 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 256 331 0 112 14 0 14 14 0 8 0 art_table 32 332 0 112 2 0 2 2 0 8 0 art_node 16 82 0 41 1 0 1 1 0 8 0 sysvmsgpl 40 66 0 26 1 0 1 1 0 8 0 semupl 112 4 0 4 1 1 0 1 0 8 0 semapl 112 60 0 50 1 0 1 1 0 8 0 shmpl 112 24 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 3902 0 2485 90 0 90 90 0 8 1 ffsino 272 3902 0 2485 96 0 96 96 0 8 0 nchpl 144 6289 0 4690 60 0 60 60 0 8 0 uvmvnodes 72 4467 0 0 82 0 82 82 0 8 0 vnodes 224 4467 0 0 263 0 263 263 0 8 0 namei 1024 15847 0 15847 1 0 1 1 0 8 1 percpumem 16 41 0 8 1 0 1 1 0 8 0 vcpupl 1984 5 0 0 1 0 1 1 0 8 0 vmpool 560 5 0 0 1 0 1 1 0 8 0 scxspl 216 18338 0 18338 9 8 1 8 0 8 1 plimitpl 152 77 0 69 1 0 1 1 0 8 0 sigapl 424 2159 0 2105 7 0 7 7 0 8 1 futexpl 56 12740 0 12740 1 0 1 1 0 8 1 knotepl 112 208 0 188 1 0 1 1 0 8 0 kqueuepl 168 844 0 842 1 0 1 1 0 8 0 pipepl 336 108 0 97 2 0 2 2 0 8 0 fdescpl 496 2122 0 2105 3 0 3 3 0 8 0 filepl 152 7135 0 7031 6 1 5 5 0 8 1 lockfpl 104 238 0 236 1 0 1 1 0 8 0 lockfspl 48 76 0 74 1 0 1 1 0 8 0 sessionpl 144 21 0 10 1 0 1 1 0 8 0 pgrppl 48 21 0 10 1 0 1 1 0 8 0 ucredpl 96 705 0 690 1 0 1 1 0 8 0 zombiepl 144 2105 0 2105 1 0 1 1 0 8 1 processpl 1080 2159 0 2105 4 0 4 4 0 8 0 procpl 672 4507 0 4444 7 1 6 7 0 8 0 sosppl 168 14 0 14 3 3 0 1 0 8 0 sockpl 480 1301 0 1274 6 1 5 5 0 8 1 mcl64k 65536 15 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 8 0 0 1 0 1 1 0 8 0 mcl8k 8192 6 0 0 1 0 1 1 0 8 0 mcl4k 4096 13 0 0 2 0 2 2 0 8 0 mcl2k 2048 203 0 0 25 0 25 25 0 8 0 mtagpl 96 83 0 0 2 0 2 2 0 8 0 mbufpl 256 418 0 0 24 0 24 24 0 8 0 bufpl 280 8326 0 2060 448 0 448 448 0 8 0 anonpl 24 529373 0 520769 67 9 58 60 0 186 5 amapchunkpl 152 57326 0 56866 22 3 19 20 0 158 1 amappl16 200 4912 0 4698 22 8 14 17 0 8 2 amappl15 192 66 0 60 1 0 1 1 0 8 0 amappl14 184 3 0 2 1 0 1 1 0 8 0 amappl13 176 49 0 47 1 0 1 1 0 8 0 amappl12 168 470 0 462 1 0 1 1 0 8 0 amappl11 160 46 0 34 1 0 1 1 0 8 0 amappl10 152 656 0 648 1 0 1 1 0 8 0 amappl9 144 598 0 596 3 2 1 1 0 8 0 amappl8 136 362 0 319 2 0 2 2 0 8 0 amappl7 128 382 0 370 1 0 1 1 0 8 0 amappl6 120 760 0 742 1 0 1 1 0 8 0 amappl5 112 1572 0 1558 1 0 1 1 0 8 0 amappl4 104 1002 0 972 1 0 1 1 0 8 0 amappl3 96 79 0 75 1 0 1 1 0 8 0 amappl2 88 900 0 854 2 0 2 2 0 8 0 amappl1 80 37862 0 37426 12 2 10 12 0 8 0 amappl 88 23887 0 23735 4 0 4 4 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 64 26 0 0 1 0 1 1 0 8 0 uaddrrnd 24 2127 0 2105 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 2127 0 2105 1 0 1 1 0 8 0 vmmpekpl 168 14158 0 14121 2 0 2 2 0 8 0 vmmpepl 168 233025 0 231449 85 14 71 74 0 357 2 vmsppl 368 2126 0 2105 2 0 2 2 0 8 0 rwobjpl 56 42612 0 41685 16 2 14 15 0 8 0 pdppl 4096 4261 0 4215 63 17 46 47 0 8 0 pvpl 32 1157331 0 1145230 144 33 111 128 0 265 11 pmappl 232 2126 0 2105 3 1 2 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 339 0 24 9 0 9 9 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 witness_checkorder(fffffd80775681b8,9,0) at witness_checkorder+0x108b rw_enter(fffffd80775681a8,1) at rw_enter+0xd4 rrw_enter(fffffd80775681a8,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd80776cb4a8,2001) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd80776cb4a8,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 vget(fffffd80776cb4a8,2001) at vget+0x1f7 sys/kern/vfs_subr.c:676 ktrwriteraw(ffff800024343a50,fffffd80776cb4a8,fffffd807f7d8a20,ffff800024371d20,ffff800024371d00) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff800024343a50,ffffffff823ba727,ffff800024371e08,8) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff800024343a50,ffffffff823ba727,ffff800024371e08,8) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_socketpair(ffff800024343a50,ffff800024371e78,ffff800024371ec0) at sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 syscall(ffff800024371f40) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800024371f40) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:590 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x88f78dfcf00, count: -12 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800020d58ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 __mp_lock(ffffffff82797ad8) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82797ad8) at __mp_lock+0x122 sys/kern/kern_lock.c:147 ktrstruct(ffff800024343cf0,ffffffff823ca664,ffff8000243637d8,10) at ktrstruct+0xee sys_clock_gettime(ffff800024343cf0,ffff800024363840,ffff800024363890) at sys_clock_gettime+0xfb sys/kern/kern_time.c:171 syscall(ffff800024363910) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800024363910) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:590 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd5bb0, count: -8