login: witness: lock order reversal: 1st 0xfffffd807effe188 vmmaplk (&map->lock) 2nd 0xfffffd804c81a6f8 inode (&ip->i_lock) lock order "&ip->i_lock"(rrwlock) -> "&map->lock"(rwlock) first seen at: #0 witness_checkorder+0x65e witness_lock_order_add sys/kern/subr_witness.c:2463 [inline] #0 witness_checkorder+0x65e sys/kern/subr_witness.c:880 #1 rw_enter_read+0x66 sys/kern/kern_rwlock.c:111 #2 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1438 #3 uvm_fault+0x7e sys/uvm/uvm_fault.c:526 #4 pageflttrap+0x254 sys/arch/amd64/amd64/trap.c:219 #5 kerntrap+0xf1 sys/arch/amd64/amd64/trap.c:301 #6 alltraps_kern_meltdown+0x7b #7 copyout+0x53 #8 ffs_read+0x3e2 sys/ufs/ffs/ffs_vnops.c:258 #9 VOP_READ+0xbf sys/kern/vfs_vops.c:253 #10 vn_rdwr+0x10b #11 vmcmd_map_readvn+0xda sys/kern/exec_subr.c:246 #12 exec_process_vmcmds+0xb2 sys/kern/exec_subr.c:143 #13 sys_execve+0x9ff sys/kern/kern_exec.c:461 #14 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #14 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 #15 Xsyscall+0x128 lock order "&map->lock"(rwlock) -> "&ip->i_lock"(rrwlock) first seen at: #0 witness_checkorder+0x65e witness_lock_order_add sys/kern/subr_witness.c:2463 [inline] #0 witness_checkorder+0x65e sys/kern/subr_witness.c:880 #1 rw_enter+0xd4 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:462 #3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:614 #4 vn_lock+0x6c sys/kern/vfs_vnops.c:575 #5 uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1196 #6 uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 #7 uvm_fault+0x1197 sys/uvm/uvm_fault.c:1016 #8 uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1285 #9 uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 #10 sys_mlock+0x180 sys/uvm/uvm_mmap.c:772 #11 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #11 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 #12 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(fffffd804c81a6f8,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd804c81a6f8,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd804c81a6e8,81) at rw_enter+0xd4 rrw_enter(fffffd804c81a6e8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd804c326ec0,81) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:614 vn_lock(fffffd804c326ec0,81) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 uvn_io(fffffd804850b000,ffff800025720728,1,2,0) at uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1196 uvn_get(fffffd804850b000,ffffffff00008000,ffff800025720980,ffff80002572091c,0,5) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 uvm_fault(fffffd807effe170,20008000,2,5) at uvm_fault+0x1197 sys/uvm/uvm_fault.c:1016 uvm_fault_wire(fffffd807effe170,20008000,2000c000,5) at uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1285 uvm_map_pageable_wire(fffffd807effe170,fffffd804c9be5e8,fffffd804c9be7e0,3b6,ffffffff8117d5be,0) at uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 sys_mlock(ffff8000ffffa9f8,ffff800025720b68,ffff800025720bb0) at sys_mlock+0x180 sys/uvm/uvm_mmap.c:772 syscall(ffff800025720c30) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800025720c30) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdcb2a91a470, count: -14 ddb{0}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff800025720380 rbx 0x3 rdx 0xffff800000af9840 rcx 0x3 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffffffff8117b263 witness_checkorder+0xf33 r9 0x5 r10 0x6fb66d4991c89ec5 r11 0x9a7ccf5b81d2e5a8 r12 0xffffffff82843d10 w_lodata+0x54590 r13 0 r14 0xffffffff8283be90 w_lodata+0x4c710 r15 0xfffffd8002c8d480 rip 0xffffffff81cb5e28 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800025720370 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.0) pid=90817 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffffb650,0xffffffff8287fe38 process=0xffff8000ffffc7e0 user=0xffff80002571b000, vmspace=0xfffffd807effe170 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 16624 174039 10381 32767 7 0x10 syz-executor.0 16624 196579 10381 32767 2 0x4000010 syz-executor.0 *16624 90817 10381 32767 7 0x4000010 syz-executor.0 23749 71928 32929 32767 3 0x90 nanosleep syz-executor.1 23749 210301 32929 32767 3 0x4000090 fsleep syz-executor.1 23749 360860 32929 32767 3 0x4000090 fsleep syz-executor.1 32929 468167 27244 32767 3 0x90 nanosleep syz-executor.1 10381 452908 86138 32767 3 0x90 nanosleep syz-executor.0 27244 324406 51048 0 3 0x82 wait syz-executor.1 86138 509273 51048 0 3 0x82 wait syz-executor.0 51048 28346 24582 0 3 0x82 thrsleep syz-fuzzer 51048 479577 24582 0 3 0x4000082 thrsleep syz-fuzzer 51048 10603 24582 0 3 0x4000082 thrsleep syz-fuzzer 51048 98360 24582 0 3 0x4000082 thrsleep syz-fuzzer 51048 503678 24582 0 3 0x4000082 thrsleep syz-fuzzer 51048 445793 24582 0 3 0x4000082 thrsleep syz-fuzzer 51048 190589 24582 0 3 0x4000082 kqread syz-fuzzer 51048 123413 24582 0 3 0x4000082 thrsleep syz-fuzzer 24582 126569 16653 0 3 0x10008a pause ksh 16653 412040 40997 0 3 0x92 select sshd 37183 194792 1 0 3 0x100083 ttyin getty 40997 296463 1 0 3 0x80 select sshd 7811 390703 85755 73 3 0x100090 kqread syslogd 85755 461834 1 0 3 0x100082 netio syslogd 36661 6058 1 77 3 0x100090 poll dhclient 9980 501008 1 0 3 0x80 poll dhclient 99205 199891 0 0 3 0x14200 bored smr 96489 281890 0 0 3 0x14200 pgzero zerothread 46788 202430 0 0 3 0x14200 aiodoned aiodoned 30780 238904 0 0 3 0x14200 syncer update 67802 454500 0 0 3 0x14200 cleaner cleaner 30315 52629 0 0 3 0x14200 reaper reaper 50448 347777 0 0 3 0x14200 pgdaemon pagedaemon 18215 377276 0 0 3 0x14200 bored crynlk 46212 165671 0 0 3 0x14200 bored crypto 22372 12808 0 0 3 0x40014200 acpi0 acpi0 68515 302025 0 0 3 0x40014200 idle1 36919 67883 0 0 3 0x14200 bored softnet 72869 280537 0 0 3 0x14200 bored systqmp 62524 34747 0 0 3 0x14200 bored systq 26286 347706 0 0 3 0x40014200 bored softclock 99339 476577 0 0 3 0x40014200 idle0 1 320580 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 16624 (syz-executor.0) thread 0xffff8000ffffa9f8 (90817) shared rwlock vmmaplk r = 0 (0xfffffd807effe188) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164 #1 rw_enter+0x446 sys/kern/kern_rwlock.c:311 #2 vm_map_lock_ln+0xda sys/uvm/uvm_map.c:5452 #3 uvm_map_pageable+0x120 sys/uvm/uvm_map.c:2463 #4 sys_mlock+0x180 sys/uvm/uvm_mmap.c:772 #5 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #5 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82880068) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164 #1 syscall+0x3fd mi_syscall sys/sys/syscall_mi.h:93 [inline] #1 syscall+0x3fd sys/arch/amd64/amd64/trap.c:567 #2 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9460 6330K 6330K 78643K 10552 0 pcb 13 8K 8K 78643K 13 0 rtable 105 3K 3K 78643K 189 0 ifaddr 39 10K 10K 78643K 39 0 counters 43 33K 33K 78643K 43 0 ioctlops 0 0K 2K 78643K 20 0 mount 1 1K 1K 78643K 1 0 vnodes 1216 76K 76K 78643K 1221 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 1K 1K 78643K 2 0 sem 11 0K 1K 78643K 14 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 8 25K 33K 78643K 346 0 proc 48 50K 83K 78643K 365 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 19 95K 95K 78643K 19 0 exec 0 0K 2K 78643K 320 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 932 95K 96K 78643K 2214 0 UVM aobj 3 2K 2K 78643K 3 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 5 0K 0K 78643K 9 0 temp 61 3951K 4015K 78643K 2417 0 kqueue 3 4K 4K 78643K 3 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 arp 64 6 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 96 19 0 17 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 23 0 15 1 0 1 1 0 8 0 syncache 272 4 0 4 1 1 0 1 0 8 0 tcpcb 592 12 0 8 1 0 1 1 0 8 0 inpcb 296 48 0 41 1 0 1 1 0 8 0 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 256 188 0 0 12 0 12 12 0 8 0 art_table 32 189 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 semupl 112 6 0 6 1 0 1 1 0 8 1 semapl 112 9 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1744 0 347 88 0 88 88 0 8 0 ffsino 272 1744 0 347 94 0 94 94 0 8 0 nchpl 144 2302 0 704 60 0 60 60 0 8 0 uvmvnodes 72 1787 0 0 33 0 33 33 0 8 0 vnodes 208 1787 0 0 95 0 95 95 0 8 0 namei 1024 5361 0 5361 2 1 1 1 0 8 1 percpumem 16 32 0 0 1 0 1 1 0 8 0 scxspl 192 6816 0 6816 10 9 1 7 0 8 1 plimitpl 152 16 0 7 1 0 1 1 0 8 0 sigapl 424 533 0 501 4 0 4 4 0 8 0 futexpl 56 1900 0 1898 1 0 1 1 0 8 0 knotepl 112 62 0 42 1 0 1 1 0 8 0 kqueuepl 152 380 0 375 1 0 1 1 0 8 0 pipepl 304 77 0 66 2 0 2 2 0 8 1 fdescpl 496 518 0 501 3 0 3 3 0 8 0 filepl 152 1777 0 1674 6 1 5 5 0 8 1 lockfpl 104 5 0 4 1 0 1 1 0 8 0 lockfspl 48 3 0 2 1 0 1 1 0 8 0 sessionpl 120 17 0 7 1 0 1 1 0 8 0 pgrppl 48 21 0 11 1 0 1 1 0 8 0 ucredpl 96 54 0 45 1 0 1 1 0 8 0 zombiepl 144 501 0 501 2 1 1 1 0 8 1 processpl 1008 533 0 501 5 0 5 5 0 8 1 procpl 632 920 0 877 4 0 4 4 0 8 0 sockpl 400 93 0 76 2 0 2 2 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 274 0 0 33 1 32 33 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 290 0 0 18 0 18 18 0 8 1 bufpl 280 3724 0 173 254 0 254 254 0 8 0 anonpl 16 242605 0 97400 592 2 590 590 0 124 6 amapchunkpl 152 10461 0 3793 261 0 261 261 0 158 4 amappl16 192 3503 0 618 145 0 145 145 0 8 0 amappl15 184 2 0 0 1 0 1 1 0 8 0 amappl14 176 191 0 182 1 0 1 1 0 8 0 amappl13 168 176 0 172 1 0 1 1 0 8 0 amappl12 160 12 0 10 3 2 1 1 0 8 0 amappl11 152 44 0 34 1 0 1 1 0 8 0 amappl10 144 15 0 4 1 0 1 1 0 8 0 amappl9 136 369 0 367 2 1 1 1 0 8 0 amappl8 128 139 0 103 2 0 2 2 0 8 0 amappl7 120 223 0 209 1 0 1 1 0 8 0 amappl6 112 61 0 53 1 0 1 1 0 8 0 amappl5 104 494 0 479 1 0 1 1 0 8 0 amappl4 96 252 0 225 1 0 1 1 0 8 0 amappl3 88 409 0 393 1 0 1 1 0 8 0 amappl2 80 3227 0 3156 2 0 2 2 0 8 0 amappl1 72 23647 0 23118 23 12 11 18 0 8 0 amappl 80 1978 0 1097 19 0 19 19 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 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 518 0 501 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 518 0 501 1 0 1 1 0 8 0 vmmpekpl 168 7068 0 7042 3 1 2 2 0 8 0 vmmpepl 168 82513 0 77346 378 11 367 367 0 357 142 vmsppl 368 517 0 501 2 0 2 2 0 8 0 pdppl 4096 1043 0 1002 6 0 6 6 0 8 0 pvpl 32 386573 0 238128 1217 1 1216 1216 0 265 18 pmappl 232 517 0 501 2 0 2 2 0 8 1 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 266 0 5 8 0 8 8 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(fffffd804c81a6f8,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd804c81a6f8,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd804c81a6e8,81) at rw_enter+0xd4 rrw_enter(fffffd804c81a6e8,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd804c326ec0,81) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:614 vn_lock(fffffd804c326ec0,81) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 uvn_io(fffffd804850b000,ffff800025720728,1,2,0) at uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1196 uvn_get(fffffd804850b000,ffffffff00008000,ffff800025720980,ffff80002572091c,0,5) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 uvm_fault(fffffd807effe170,20008000,2,5) at uvm_fault+0x1197 sys/uvm/uvm_fault.c:1016 uvm_fault_wire(fffffd807effe170,20008000,2000c000,5) at uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1285 uvm_map_pageable_wire(fffffd807effe170,fffffd804c9be5e8,fffffd804c9be7e0,3b6,ffffffff8117d5be,0) at uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 sys_mlock(ffff8000ffffa9f8,ffff800025720b68,ffff800025720bb0) at sys_mlock+0x180 sys/uvm/uvm_mmap.c:772 syscall(ffff800025720c30) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800025720c30) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xdcb2a91a470, count: -14 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800020d80ff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x37 kd_curproc sys/dev/kcov.c:569 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x37 sys/dev/kcov.c:143 __mp_lock(ffffffff8287fe60) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff8287fe60) at __mp_lock+0x133 sys/kern/kern_lock.c:147 pageflttrap(ffff800025700cb0,20000040,1) at pageflttrap+0x70 sys/arch/amd64/amd64/trap.c:178 usertrap(ffff800025700cb0) at usertrap+0x210 sys/arch/amd64/amd64/trap.c:383 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffcb890, count: -8