witness: lock order reversal: 1st 0xfffffd806f25cdf0 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd80577152c0 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:399 witness_checkorder(fffffd80577152c0,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd80577152c0,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd80577152b0,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd80577152b0,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd804ee4b390,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd804ee4b390,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd804f3415a0,0,ffff80002128d778,ffff80002128d748,0,0) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd804f3415a0,0,ffff80002128d778,ffff80002128d748,0,0) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff80002128d8e0,ffff80002128d918,ffff80002128d860,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd8008582000,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff80002128da70,20000040) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff80002128da70) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff80002128dcb0) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002128dcb0) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d411b97920, count: -15 ddb{0}> show registers rdi 0xffff800021296000 rsi 0x13a88 mp_pdirpa+0x2a82 rbp 0xffff80002128d3f0 rbx 0x3 rdx 0xffff800021296000 rcx 0x13a87 mp_pdirpa+0x2a81 rax 0xffffffff81fcd337 db_enter+0x17 r8 0xffffffff81fed1fc witness_checkorder+0x10cc r9 0x5 r10 0x76804d3af88f037d r11 0x415c2d53de7d4afb r12 0xfffffd8002dab7c0 r13 0 r14 0 r15 0 rip 0xffffffff81fcd338 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002128d3e0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=261063 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=73, nice=20 forw=0xffffffffffffffff, list=0xffff80002121f508,0xffff80002121e558 process=0xffff8000ffff9928 user=0xffff800021288000, vmspace=0xfffffd8008582000 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 58669 358570 27134 32767 2 0x10 syz-executor.1 58669 297053 27134 32767 2 0x4000010 syz-executor.1 2660 101653 80001 32767 2 0x10 syz-executor.0 * 2660 261063 80001 32767 7 0x4000010 syz-executor.0 2660 386194 80001 32767 7 0x4000010 syz-executor.0 27134 53881 23021 32767 3 0x90 nanoslp syz-executor.1 80001 288322 99843 32767 3 0x90 nanoslp syz-executor.0 23021 234305 14149 0 3 0x82 wait syz-executor.1 99843 385140 14149 0 3 0x82 wait syz-executor.0 14149 426515 78754 0 3 0x82 thrsleep syz-fuzzer 14149 179301 78754 0 3 0x4000082 thrsleep syz-fuzzer 14149 85550 78754 0 3 0x4000082 thrsleep syz-fuzzer 14149 223856 78754 0 3 0x4000082 thrsleep syz-fuzzer 14149 29588 78754 0 3 0x4000082 kqread syz-fuzzer 14149 265593 78754 0 3 0x4000082 thrsleep syz-fuzzer 14149 112651 78754 0 3 0x4000082 thrsleep syz-fuzzer 14149 340508 78754 0 3 0x4000082 thrsleep syz-fuzzer 78754 350997 73235 0 3 0x10008a sigsusp ksh 73235 60488 91650 0 3 0x9a select sshd 30723 96937 1 0 3 0x100083 ttyin getty 91650 323431 1 0 3 0x88 select sshd 70731 223175 30001 73 3 0x100090 kqread syslogd 30001 282167 1 0 3 0x100082 netio syslogd 42221 188363 1 0 3 0x100080 kqread resolvd 27304 77842 7393 77 3 0x100092 kqread dhcpleased 40356 262799 7393 77 3 0x100092 kqread dhcpleased 7393 133340 1 0 3 0x80 kqread dhcpleased 86109 226151 0 0 3 0x14200 bored smr 92761 291102 0 0 2 0x14200 zerothread 94220 446662 0 0 3 0x14200 aiodoned aiodoned 13806 311655 0 0 3 0x14200 syncer update 14708 247304 0 0 3 0x14200 cleaner cleaner 5849 486819 0 0 3 0x14200 reaper reaper 64563 363705 0 0 3 0x14200 pgdaemon pagedaemon 934 62028 0 0 3 0x14200 bored crynlk 8010 185213 0 0 3 0x14200 bored crypto 71892 487611 0 0 3 0x14200 bored viomb 14617 14256 0 0 3 0x40014200 acpi0 acpi0 65914 461657 0 0 3 0x40014200 idle1 3043 301317 0 0 3 0x14200 bored softnet 16406 328780 0 0 3 0x14200 bored systqmp 99911 305758 0 0 3 0x14200 bored systq 29844 169504 0 0 3 0x40014200 bored softclock 35294 40582 0 0 3 0x40014200 idle0 1 111341 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 2660 (syz-executor.0) thread 0xffff80002121e7e8 (261063) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828e3a18) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 uvm_fault+0x224 sys/uvm/uvm_fault.c:637 #2 kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 #3 kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 #4 alltraps_kern_meltdown+0x7b #5 copyout+0x53 #6 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] #6 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 #7 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xfffffd806f25cdf0) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 dopipe+0xd6 #2 syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] #2 syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 #3 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10115 6354K 6380K 78643K 11205 0 pcb 13 8K 8K 78643K 13 0 rtable 106 3K 3K 78643K 168 0 ifaddr 39 10K 10K 78643K 39 0 sysctl 0 0K 0K 78643K 1 0 counters 44 34K 34K 78643K 44 0 ioctlops 0 0K 2K 78643K 44 0 iov 0 0K 0K 78643K 15 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 6 0 vnodes 1216 76K 76K 78643K 1223 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 4 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 126 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 8 25K 33K 78643K 3722 0 proc 56 74K 99K 78643K 279 0 subproc 34 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 33 2K 2K 78643K 33 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 37 175K 175K 78643K 37 0 exec 0 0K 2K 78643K 368 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 694 64K 64K 78643K 46573 0 UVM aobj 6 2K 2K 78643K 6 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 5 0K 0K 78643K 9 0 temp 101 4205K 4269K 78643K 9527 0 kqueue 10 14K 18K 78643K 20 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 22 0 0 1 0 1 1 0 8 0 rtpcb 120 25 0 22 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 321 0 308 1 0 1 1 0 8 0 syncache 296 4 0 4 1 1 0 1 0 8 0 tcpqe 32 104 0 104 2 2 0 1 0 8 0 tcpcb 736 710 0 692 9 6 3 4 0 8 1 arp 120 6 0 0 1 0 1 1 0 8 0 inpcb 304 737 0 730 4 2 2 2 0 8 1 nd6 48 6 0 0 1 0 1 1 0 8 0 kcovpl 48 2 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 189 0 0 12 0 12 12 0 8 0 art_table 32 190 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 sysvmsgpl 40 52 0 24 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 112 0 102 1 0 1 1 0 8 0 shmpl 112 3 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 5476 0 4072 88 0 88 88 0 8 0 ffsino 272 5476 0 4072 95 1 94 94 0 8 0 nchpl 144 10025 0 8410 60 0 60 60 0 8 0 uvmvnodes 72 5519 0 0 101 0 101 101 0 8 0 vnodes 224 5519 0 0 325 0 325 325 0 8 0 namei 1024 22231 0 22231 2 1 1 1 0 8 1 percpumem 16 34 0 0 1 0 1 1 0 8 0 scxspl 216 28090 0 28090 13 12 1 8 0 8 1 plimitpl 152 18 0 8 1 0 1 1 0 8 0 sigapl 424 3944 0 3909 5 1 4 5 0 8 0 futexpl 56 22821 0 22821 1 0 1 1 0 8 1 knotepl 112 50 0 0 2 0 2 2 0 8 0 kqueuepl 216 4461 0 4452 1 0 1 1 0 8 0 pipepl 336 128 0 116 4 2 2 2 0 8 0 fdescpl 496 3928 0 3909 3 0 3 3 0 8 0 filepl 152 12776 0 12659 5 0 5 5 0 8 0 lockfpl 104 766 0 763 1 0 1 1 0 8 0 lockfspl 48 370 0 367 1 0 1 1 0 8 0 sessionpl 144 17 0 7 1 0 1 1 0 8 0 pgrppl 48 17 0 7 1 0 1 1 0 8 0 ucredpl 96 133 0 121 1 0 1 1 0 8 0 zombiepl 144 3909 0 3909 2 1 1 1 0 8 1 processpl 1072 3944 0 3909 3 0 3 3 0 8 0 procpl 672 8280 0 8235 7 2 5 5 0 8 1 sockpl 480 1096 0 1073 6 2 4 5 0 8 0 mcl64k 65536 2 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 16 0 0 2 0 2 2 0 8 0 mcl9k 9216 7 0 0 1 0 1 1 0 8 0 mcl8k 8192 5 0 0 1 0 1 1 0 8 0 mcl4k 4096 20 0 0 3 1 2 3 0 8 0 mcl2k2 2112 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 320 0 0 33 0 33 33 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 512 0 0 24 0 24 24 0 8 0 bufpl 280 7048 0 716 453 0 453 453 0 8 0 anonpl 24 1110283 0 1001176 691 4 687 689 0 186 0 amapchunkpl 152 112138 0 107949 166 4 162 163 0 158 0 amappl16 200 8680 0 5575 164 0 164 164 0 8 0 amappl15 192 1 0 0 1 0 1 1 0 8 0 amappl14 184 2 0 1 1 0 1 1 0 8 0 amappl13 176 1956 0 1952 1 0 1 1 0 8 0 amappl12 168 4 0 2 1 0 1 1 0 8 0 amappl11 160 40 0 29 1 0 1 1 0 8 0 amappl10 152 46 0 39 1 0 1 1 0 8 0 amappl9 144 173 0 168 1 0 1 1 0 8 0 amappl8 136 2211 0 2159 2 0 2 2 0 8 0 amappl7 128 1920 0 1903 1 0 1 1 0 8 0 amappl6 120 110 0 99 1 0 1 1 0 8 0 amappl5 112 3998 0 3980 1 0 1 1 0 8 0 amappl4 104 530 0 502 1 0 1 1 0 8 0 amappl3 96 569 0 567 1 0 1 1 0 8 0 amappl2 88 2308 0 2252 2 0 2 2 0 8 0 amappl1 80 68851 0 68400 13 3 10 12 0 8 0 amappl 88 45857 0 45240 14 0 14 14 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 5 0 0 1 0 1 1 0 8 0 uaddrrnd 24 3928 0 3909 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 3928 0 3909 1 0 1 1 0 8 0 vmmpekpl 168 25296 0 25271 2 0 2 2 0 8 0 vmmpepl 168 452013 0 446936 347 83 264 342 0 357 43 vmsppl 368 3927 0 3909 2 0 2 2 0 8 0 rwobjpl 56 80123 0 75822 64 3 61 61 0 8 0 pdppl 4096 7864 0 7818 76 30 46 50 0 8 0 pvpl 32 2038857 0 1926018 958 10 948 952 0 265 0 pmappl 224 3927 0 3909 2 0 2 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 358 0 43 10 0 10 10 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:399 witness_checkorder(fffffd80577152c0,9,0) at witness_checkorder+0x10f3 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd80577152c0,9,0) at witness_checkorder+0x10f3 sys/kern/subr_witness.c:1105 rw_enter(fffffd80577152b0,81) at rw_enter+0xd1 sys/kern/kern_rwlock.c:250 rrw_enter(fffffd80577152b0,81) at rrw_enter+0x8b sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd804ee4b390,81) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd804ee4b390,81) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 uvn_get(fffffd804f3415a0,0,ffff80002128d778,ffff80002128d748,0,0) at uvn_get+0x256 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] uvn_get(fffffd804f3415a0,0,ffff80002128d778,ffff80002128d748,0,0) at uvn_get+0x256 sys/uvm/uvm_vnode.c:993 uvm_fault_lower(ffff80002128d8e0,ffff80002128d918,ffff80002128d860,0) at uvm_fault_lower+0x302 sys/uvm/uvm_fault.c:1251 uvm_fault(fffffd8008582000,20000000,0,2) at uvm_fault+0x240 sys/uvm/uvm_fault.c:638 kpageflttrap(ffff80002128da70,20000040) at kpageflttrap+0x1fd sys/arch/amd64/amd64/trap.c:264 kerntrap(ffff80002128da70) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 syscall(ffff80002128dcb0) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff80002128dcb0) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d411b97920, count: -15 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800020d38ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:353 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(ffffffff828e3810) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828e3810) at __mp_lock+0x122 sys/kern/kern_lock.c:147 __mp_acquire_count(ffffffff828e3810,2) at __mp_acquire_count+0x4c sys/kern/kern_lock.c:227 mi_switch() at mi_switch+0x3d3 sys/kern/sched_bsd.c:433 sleep_finish(ffff8000256c6d78,1) at sleep_finish+0x1b2 sys/kern/kern_synch.c:433 rw_enter(fffffd8008582008,21) at rw_enter+0x35b sys/kern/kern_rwlock.c:286 vm_map_lock_ln(fffffd8008582000,ffffffff8249bd4a,367) at vm_map_lock_ln+0xda sys/uvm/uvm_map.c:5425 uvm_mmaplock(fffffd8008582000,ffff8000256c6ff0,3000,2,800000) at uvm_mmaplock+0x64 sys/uvm/uvm_mmap.c:872 sys_mmap(ffff80002121ed28,ffff8000256c7098,ffff8000256c70e0) at sys_mmap+0xbfb sys/uvm/uvm_mmap.c:395 syscall(ffff8000256c7160) at syscall+0x5a9 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000256c7160) at syscall+0x5a9 sys/arch/amd64/amd64/trap.c:587 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7d4507c0050, count: -13