witness: lock order reversal: 1st 0xfffffd8077f7c448 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd8077615a38 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(fffffd8077615a38,9,0) at witness_checkorder+0x108b rw_enter(fffffd8077615a28,1) at rw_enter+0xd4 rrw_enter(fffffd8077615a28,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd8066a452a0,2001) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd8066a452a0,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 vget(fffffd8066a452a0,2001) at vget+0x1f7 sys/kern/vfs_subr.c:676 ktrwriteraw(ffff8000212b4fd0,fffffd8066a452a0,fffffd807f7d8b40,ffff8000222d1c40,ffff8000222d1c20) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff8000212b4fd0,ffffffff823bade1,ffff8000222d1d28,8) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff8000212b4fd0,ffffffff823bade1,ffff8000222d1d28,8) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_socketpair(ffff8000212b4fd0,ffff8000222d1d98,ffff8000222d1de0) at sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 syscall(ffff8000222d1e60) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000222d1e60) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe39f07c48c0, count: -12 ddb{0}> show registers rdi 0xffff8000234bc000 rsi 0x12d94 mp_pdirpa+0x1d8e rbp 0xffff8000222d1850 rbx 0x3 rdx 0xffff8000234bc000 rcx 0x12d93 mp_pdirpa+0x1d8d rax 0xffffffff812bdc77 db_enter+0x17 r8 0xffffffff81aff0e1 witness_checkorder+0x1061 r9 0x5 r10 0x111640d31333bd16 r11 0x2de40c05f2482906 r12 0 r13 0xfffffd8077615a38 r14 0 r15 0xfffffd8002cf9740 rip 0xffffffff812bdc78 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000222d1840 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=20285 stat=onproc flags process=0 proc=4000001 pri=32, usrpri=80, nice=20 forw=0xffffffffffffffff, list=0xffff8000212b4550,0xffffffff827998b0 process=0xffff800022332610 user=0xffff8000222cc000, vmspace=0xfffffd80084d6170 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 11359 337289 88740 0 7 0 syz-executor.1 *11359 20285 88740 0 7 0x4000001 syz-executor.1 88740 103879 44131 0 3 0x82 nanoslp syz-executor.1 23582 216073 0 0 3 0x14280 nfsidl nfsio 65030 408897 0 0 3 0x14280 nfsidl nfsio 84691 185908 0 0 3 0x14280 nfsidl nfsio 31025 326803 0 0 3 0x14280 nfsidl nfsio 91995 459465 0 0 3 0x14280 nfsidl nfsio 59753 225593 0 0 3 0x14280 nfsidl nfsio 46255 271973 0 0 3 0x14280 nfsidl nfsio 87207 472474 0 0 3 0x14280 nfsidl nfsio 42561 286906 0 0 3 0x14280 nfsidl nfsio 20605 223072 0 0 3 0x14280 nfsidl nfsio 22201 475175 0 0 3 0x14280 nfsidl nfsio 44214 506073 0 0 3 0x14280 nfsidl nfsio 30034 33466 0 0 3 0x14280 nfsidl nfsio 57935 486851 0 0 3 0x14280 nfsidl nfsio 36872 449689 0 0 3 0x14280 nfsidl nfsio 69515 269261 0 0 3 0x14280 nfsidl nfsio 33998 261128 0 0 3 0x14280 nfsidl nfsio 59766 401830 0 0 3 0x14280 nfsidl nfsio 29155 207993 0 0 3 0x14280 nfsidl nfsio 56135 522169 0 0 3 0x14280 nfsidl nfsio 99149 152988 44131 0 3 0x82 nanoslp syz-executor.0 44131 202641 5742 0 3 0x82 thrsleep syz-fuzzer 44131 314633 5742 0 3 0x4000082 thrsleep syz-fuzzer 44131 240635 5742 0 3 0x4000082 thrsleep syz-fuzzer 44131 332468 5742 0 3 0x4000082 thrsleep syz-fuzzer 44131 67268 5742 0 3 0x4000082 thrsleep syz-fuzzer 44131 136567 5742 0 3 0x4000082 thrsleep syz-fuzzer 44131 42646 5742 0 3 0x4000082 kqread syz-fuzzer 44131 351333 5742 0 3 0x4000082 thrsleep syz-fuzzer 5742 68077 9409 0 3 0x10008a sigsusp ksh 9409 316592 43594 0 3 0x92 select sshd 43557 493470 1 0 3 0x100083 ttyin getty 43594 38591 1 0 3 0x80 select sshd 76570 488086 69115 74 3 0x100092 bpf pflogd 69115 156171 1 0 3 0x80 netio pflogd 69025 15537 7192 73 3 0x100090 kqread syslogd 7192 114977 1 0 3 0x100082 netio syslogd 28519 446490 1 77 3 0x100090 poll dhclient 23286 436954 1 0 3 0x80 poll dhclient 23511 246329 0 0 3 0x14200 bored smr 32710 108513 0 0 3 0x14200 pgzero zerothread 31549 105969 0 0 3 0x14200 aiodoned aiodoned 59707 94091 0 0 3 0x14200 syncer update 68599 148018 0 0 3 0x14200 cleaner cleaner 17320 498178 0 0 3 0x14200 reaper reaper 77075 442522 0 0 3 0x14200 pgdaemon pagedaemon 10878 292659 0 0 3 0x14200 bored crynlk 12354 148071 0 0 3 0x14200 bored crypto 15313 400166 0 0 3 0x14200 bored viomb 83387 172838 0 0 3 0x40014200 acpi0 acpi0 20909 226480 0 0 3 0x40014200 idle1 10359 420140 0 0 3 0x14200 bored softnet 41947 498659 0 0 3 0x14200 bored systqmp 11869 70133 0 0 3 0x14200 bored systq 3313 461767 0 0 3 0x40014200 bored softclock 13625 482351 0 0 3 0x40014200 idle0 1 105015 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 11359 (syz-executor.1) thread 0xffff8000212b4fd0 (20285) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828e58d0) #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:585 #4 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xfffffd8077f7c448) #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:585 #3 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10119 6488K 6500K 78643K 17016 0 pcb 13 8K 8K 78643K 1405 0 rtable 105 3K 3K 78643K 237 0 ifaddr 44 10K 10K 78643K 52 0 sysctl 2 0K 0K 78643K 2 0 counters 44 34K 34K 78643K 46 0 ioctlops 0 0K 4K 78643K 2049 0 iov 0 0K 12K 78643K 2920 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 1 0 vnodes 1213 76K 77K 78643K 5945 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 439 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 527 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 5 13K 25K 78643K 50693 0 sigio 0 0K 0K 78643K 398 0 proc 60 63K 95K 78643K 5186 0 subproc 32 2K 2K 78643K 51 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 33 2K 2K 78643K 44 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 19 95K 95K 78643K 19 0 exec 0 0K 2K 78643K 1278 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 275 28K 28K 78643K 608202 0 UVM aobj 131 8K 8K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 6 0K 0K 78643K 13 0 temp 106 3981K 4049K 78643K 144275 0 kqueue 7 12K 18K 78643K 4633 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 1876 0 1874 1 0 1 1 0 8 0 rtentry 112 56 0 12 2 0 2 2 0 8 0 unpcb 120 9211 0 9199 1 0 1 1 0 8 0 syncache 296 4 0 4 1 1 0 1 0 8 0 tcpcb 736 1757 0 1753 23 21 2 6 0 8 1 arp 120 8 0 2 1 0 1 1 0 8 0 inpcb 304 7192 0 7186 1 0 1 1 0 8 0 nd6 48 9 0 3 1 0 1 1 0 8 0 pkpcb 40 8 0 8 1 1 0 1 0 8 0 kcovpl 48 3 0 1 1 0 1 1 0 8 0 pffrag 232 14 0 14 3 3 0 1 0 482 0 pffrnode 88 11 0 11 3 3 0 1 0 8 0 pffrent 40 241 0 241 3 3 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 30 0 27 1 0 1 1 0 8 0 pfstkey 112 30 0 27 1 0 1 1 0 8 0 pfstate 320 30 0 27 2 1 1 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 256 232 0 44 12 0 12 12 0 8 0 art_table 32 233 0 44 2 0 2 2 0 8 0 art_node 16 55 0 15 1 0 1 1 0 8 0 sysvmsgpl 40 13 0 0 1 0 1 1 0 8 0 semapl 112 525 0 515 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 59154 0 57699 91 0 91 91 0 8 0 ffsino 272 59154 0 57699 97 0 97 97 0 8 0 nchpl 144 121723 0 120124 60 0 60 60 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 301999 0 301999 1 0 1 1 0 8 1 percpumem 16 34 0 1 1 0 1 1 0 8 0 scxspl 216 330831 0 330831 8 7 1 7 0 8 1 plimitpl 152 16 0 8 1 0 1 1 0 8 0 sigapl 424 50925 0 50873 6 0 6 6 0 8 0 futexpl 56 216621 0 216621 1 0 1 1 0 8 1 knotepl 112 4689 0 4669 1 0 1 1 0 8 0 kqueuepl 168 6706 0 6661 11 9 2 3 0 8 0 pipepl 336 5887 0 5876 54 52 2 2 0 8 1 fdescpl 496 50889 0 50873 3 0 3 3 0 8 0 filepl 152 133029 0 132925 24 19 5 5 0 8 1 lockfpl 104 7015 0 7014 1 0 1 1 0 8 0 lockfspl 48 3218 0 3217 1 0 1 1 0 8 0 sessionpl 144 19 0 8 1 0 1 1 0 8 0 pgrppl 48 2133 0 2122 1 0 1 1 0 8 0 ucredpl 96 1056 0 1047 1 0 1 1 0 8 0 zombiepl 144 50873 0 50872 1 0 1 1 0 8 0 processpl 1080 50925 0 50872 4 0 4 4 0 8 0 procpl 672 113490 0 113429 6 0 6 6 0 8 0 sockpl 480 18452 0 18432 10 7 3 4 0 8 0 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 17 0 0 3 0 3 3 0 8 0 mcl12k 12288 61 0 0 2 0 2 2 0 8 0 mcl9k 9216 57 0 0 3 1 2 2 0 8 0 mcl8k 8192 38 0 0 5 2 3 3 0 8 0 mcl4k 4096 39 0 0 3 0 3 3 0 8 0 mcl2k2 2112 8 0 0 1 0 1 1 0 8 0 mcl2k 2048 149 0 0 11 0 11 11 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 1897 0 0 15 2 13 15 0 8 0 bufpl 280 55496 0 49230 448 0 448 448 0 8 0 anonpl 24 12927592 0 12920971 97 53 44 66 0 186 1 amapchunkpl 152 1442150 0 1441784 61 45 16 16 0 158 1 amappl16 200 96276 0 96104 23 13 10 21 0 8 0 amappl15 192 63 0 58 1 0 1 1 0 8 0 amappl14 184 9 0 7 1 0 1 1 0 8 0 amappl13 176 25466 0 25464 1 0 1 1 0 8 0 amappl12 168 24951 0 24944 1 0 1 1 0 8 0 amappl11 160 368 0 353 1 0 1 1 0 8 0 amappl10 152 31 0 24 1 0 1 1 0 8 0 amappl9 144 296 0 295 1 0 1 1 0 8 0 amappl8 136 1490 0 1339 7 1 6 6 0 8 0 amappl7 128 60 0 51 1 0 1 1 0 8 0 amappl6 120 125 0 104 1 0 1 1 0 8 0 amappl5 112 25606 0 25594 1 0 1 1 0 8 0 amappl4 104 25829 0 25801 1 0 1 1 0 8 0 amappl3 96 52701 0 52695 1 0 1 1 0 8 0 amappl2 88 1820 0 1770 2 0 2 2 0 8 0 amappl1 80 836842 0 836424 14 4 10 12 0 8 0 amappl 88 607712 0 607595 3 0 3 3 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 64 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 50889 0 50873 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 50889 0 50873 1 0 1 1 0 8 0 vmmpekpl 168 224740 0 224713 2 0 2 2 0 8 0 vmmpepl 168 5592923 0 5591410 149 77 72 80 0 357 0 vmsppl 368 50888 0 50873 2 0 2 2 0 8 0 rwobjpl 56 947068 0 946114 28 14 14 17 0 8 0 pdppl 4096 101785 0 101746 56 15 41 45 0 8 2 pvpl 32 21452213 0 21442211 456 366 90 128 0 265 5 pmappl 232 50888 0 50873 2 1 1 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 385 0 95 10 1 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(fffffd8077615a38,9,0) at witness_checkorder+0x108b rw_enter(fffffd8077615a28,1) at rw_enter+0xd4 rrw_enter(fffffd8077615a28,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd8066a452a0,2001) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd8066a452a0,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 vget(fffffd8066a452a0,2001) at vget+0x1f7 sys/kern/vfs_subr.c:676 ktrwriteraw(ffff8000212b4fd0,fffffd8066a452a0,fffffd807f7d8b40,ffff8000222d1c40,ffff8000222d1c20) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff8000212b4fd0,ffffffff823bade1,ffff8000222d1d28,8) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff8000212b4fd0,ffffffff823bade1,ffff8000222d1d28,8) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_socketpair(ffff8000212b4fd0,ffff8000222d1d98,ffff8000222d1de0) at sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 syscall(ffff8000222d1e60) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000222d1e60) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe39f07c48c0, 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 end of kernel end trace frame: 0x7f7ffffe0080, count: -3