login: witness: lock order reversal: 1st 0xfffffd807efff2f8 vmmaplk (&map->lock) 2nd 0xfffffd806dcdbd68 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:247 #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:603 #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_mlockall+0x6a sys/uvm/uvm_mmap.c:828 #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{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(fffffd806dcdbd68,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd806dcdbd68,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd806dcdbd58,81) at rw_enter+0xd4 rrw_enter(fffffd806dcdbd58,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd80673d8820,81) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:603 vn_lock(fffffd80673d8820,81) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 uvn_io(fffffd806dd2fd88,ffff800023508f58,1,2,0) at uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1196 uvn_get(fffffd806dd2fd88,4000,ffff8000235091b0,ffff80002350914c,0,3) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 uvm_fault(fffffd807efff2e0,1b2e524000,2,3) at uvm_fault+0x1197 sys/uvm/uvm_fault.c:1016 uvm_fault_wire(fffffd807efff2e0,1b2e520000,1b2f520000,3) at uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1285 uvm_map_pageable_wire(fffffd807efff2e0,fffffd80665c3768,0,771,ffffffff8105f2e0,0) at uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 sys_mlockall(ffff8000212d6020,ffff800023509388,ffff8000235093d0) at sys_mlockall+0x6a sys/uvm/uvm_mmap.c:828 syscall(ffff800023509450) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800023509450) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x91e7f4527f0, count: -14 ddb{1}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff800023508bb0 rbx 0x3 rdx 0xffff800000029440 rcx 0x3 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffffffff81f69fe3 witness_checkorder+0xf33 r9 0x5 r10 0xbddd0a294ed4d157 r11 0x18bcf9facdfed8c r12 0xffffffff828737c0 w_lodata+0x544e0 r13 0 r14 0xffffffff8286b9f0 w_lodata+0x4c710 r15 0xfffffd8002c8e480 rip 0xffffffff81b044c8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800023508ba0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=477050 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000212d6ef0,0xffff8000212d73f0 process=0xffff8000212013c0 user=0xffff800023504000, vmspace=0xfffffd807efff2e0 estcpu=36, cpticks=7, pctcpu=0.0 user=0, sys=6, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 33699 180233 35656 0 7 0 syz-executor.0 97489 241964 15145 0 2 0 syz-executor.1 *97489 477050 15145 0 7 0x4000000 syz-executor.1 35656 346012 9158 0 3 0x82 nanosleep syz-executor.0 15145 483286 9158 0 3 0x82 nanosleep syz-executor.1 9158 197583 16062 0 3 0x82 thrsleep syz-fuzzer 9158 365255 16062 0 3 0x4000082 nanosleep syz-fuzzer 9158 458569 16062 0 3 0x4000082 thrsleep syz-fuzzer 9158 28289 16062 0 3 0x4000082 thrsleep syz-fuzzer 9158 365720 16062 0 3 0x4000082 thrsleep syz-fuzzer 9158 513007 16062 0 3 0x4000082 thrsleep syz-fuzzer 9158 179490 16062 0 3 0x4000082 kqread syz-fuzzer 9158 161725 16062 0 3 0x4000082 nanosleep syz-fuzzer 16062 460902 63262 0 3 0x10008a pause ksh 63262 325347 42219 0 3 0x92 select sshd 65869 432856 1 0 3 0x100083 ttyin getty 42219 179651 1 0 3 0x80 select sshd 19369 84342 9801 74 3 0x100092 bpf pflogd 9801 193432 1 0 3 0x80 netio pflogd 77879 64277 36327 73 3 0x100090 kqread syslogd 36327 203628 1 0 3 0x100082 netio syslogd 42440 87003 1 77 3 0x100090 poll dhclient 12894 460928 1 0 3 0x80 poll dhclient 44389 369533 0 0 3 0x14200 bored smr 19707 386153 0 0 2 0x14200 zerothread 785 439416 0 0 3 0x14200 aiodoned aiodoned 19809 254319 0 0 3 0x14200 syncer update 92844 484555 0 0 3 0x14200 cleaner cleaner 55230 370018 0 0 3 0x14200 reaper reaper 65189 88154 0 0 3 0x14200 pgdaemon pagedaemon 71980 416718 0 0 3 0x14200 bored crynlk 85427 439050 0 0 3 0x14200 bored crypto 28624 481427 0 0 3 0x40014200 acpi0 acpi0 82730 157953 0 0 3 0x40014200 idle1 55560 193819 0 0 3 0x14200 bored softnet 50525 143292 0 0 3 0x14200 bored systqmp 58571 401797 0 0 3 0x14200 bored systq 85828 212702 0 0 3 0x40014200 bored softclock 65846 384749 0 0 3 0x40014200 idle0 1 297542 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 97489 (syz-executor.1) thread 0xffff8000212d6020 (477050) shared rwlock vmmaplk r = 0 (0xfffffd807efff2f8) #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_all+0x56 sys/uvm/uvm_map.c:2576 #4 sys_mlockall+0x6a sys/uvm/uvm_mmap.c:828 #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 (0xffffffff82898598) #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{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9469 6399K 6399K 78643K 10562 0 pcb 13 8K 8K 78643K 37 0 rtable 105 3K 3K 78643K 199 0 ifaddr 44 10K 10K 78643K 45 0 counters 43 33K 33K 78643K 43 0 ioctlops 0 0K 4K 78643K 1469 0 iov 0 0K 12K 78643K 35 0 mount 1 1K 1K 78643K 1 0 vnodes 1211 76K 76K 78643K 1230 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 12 0K 1K 78643K 69 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 6 17K 25K 78643K 153 0 proc 60 63K 95K 78643K 448 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 2 0 in_multi 33 2K 2K 78643K 37 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 31 148K 148K 78643K 31 0 exec 0 0K 2K 78643K 358 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 187 31K 38K 78643K 1133 0 UVM aobj 4 3K 3K 78643K 4 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 6 0K 0K 78643K 10 0 temp 67 3952K 4016K 78643K 2280 0 kqueue 3 4K 4K 78643K 3 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> 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 23 0 21 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 53 0 43 1 0 1 1 0 8 0 syncache 272 4 0 4 1 1 0 1 0 8 0 tcpqe 32 260 0 260 1 0 1 1 0 8 1 tcpcb 592 21 0 17 1 0 1 1 0 8 0 inpcb 296 86 0 79 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 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 14 0 2 1 0 1 1 0 8 0 pfstkey 112 14 0 2 1 0 1 1 0 8 0 pfstate 328 14 0 2 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 256 189 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 semupl 112 3 0 3 1 0 1 1 0 8 1 semapl 112 67 0 57 1 0 1 1 0 8 0 shmpl 112 1 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1605 0 206 88 0 88 88 0 8 0 ffsino 272 1605 0 206 95 1 94 94 0 8 0 nchpl 144 1988 0 385 60 0 60 60 0 8 0 uvmvnodes 72 1649 0 0 30 0 30 30 0 8 0 vnodes 208 1649 0 0 87 0 87 87 0 8 0 namei 1024 5000 0 5000 2 1 1 1 0 8 1 percpumem 16 32 0 0 1 0 1 1 0 8 0 scxspl 192 6093 0 6093 8 1 7 7 0 8 7 plimitpl 152 18 0 9 1 0 1 1 0 8 0 sigapl 424 368 0 336 4 0 4 4 0 8 0 futexpl 56 601 0 601 1 0 1 1 0 8 1 knotepl 112 62 0 42 1 0 1 1 0 8 0 kqueuepl 152 2 0 0 1 0 1 1 0 8 0 pipepl 304 84 0 73 2 0 2 2 0 8 1 fdescpl 496 353 0 336 3 0 3 3 0 8 0 filepl 152 1400 0 1298 6 1 5 5 0 8 0 lockfpl 104 20 0 19 1 0 1 1 0 8 0 lockfspl 48 7 0 6 1 0 1 1 0 8 0 sessionpl 120 18 0 7 1 0 1 1 0 8 0 pgrppl 48 18 0 7 1 0 1 1 0 8 0 ucredpl 96 59 0 50 1 0 1 1 0 8 0 zombiepl 144 336 0 336 2 1 1 1 0 8 1 processpl 1008 368 0 336 6 1 5 5 0 8 1 procpl 632 528 0 488 5 1 4 4 0 8 0 sockpl 400 162 0 143 4 1 3 3 0 8 1 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 341 0 0 42 0 42 42 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 347 0 0 22 0 22 22 0 8 0 bufpl 280 4235 0 181 290 0 290 290 0 8 0 anonpl 16 60207 0 33254 110 1 109 109 0 124 0 amapchunkpl 152 2397 0 1581 33 1 32 32 0 158 0 amappl16 192 1417 0 552 47 0 47 47 0 8 3 amappl15 184 62 0 60 1 0 1 1 0 8 0 amappl14 176 22 0 18 1 0 1 1 0 8 0 amappl13 168 26 0 24 1 0 1 1 0 8 0 amappl12 160 13 0 8 1 0 1 1 0 8 0 amappl11 152 55 0 39 1 0 1 1 0 8 0 amappl10 144 10 0 5 1 0 1 1 0 8 0 amappl9 136 424 0 421 1 0 1 1 0 8 0 amappl8 128 203 0 132 3 0 3 3 0 8 0 amappl7 120 310 0 299 1 0 1 1 0 8 0 amappl6 112 68 0 57 1 0 1 1 0 8 0 amappl5 104 498 0 480 1 0 1 1 0 8 0 amappl4 96 286 0 259 1 0 1 1 0 8 0 amappl3 88 124 0 115 1 0 1 1 0 8 0 amappl2 80 1761 0 1693 3 0 3 3 0 8 0 amappl1 72 18719 0 18224 25 14 11 19 0 8 1 amappl 80 850 0 737 3 0 3 3 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 353 0 336 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 353 0 336 1 0 1 1 0 8 0 vmmpekpl 168 6580 0 6551 2 0 2 2 0 8 0 vmmpepl 168 52080 0 49846 139 6 133 133 0 357 35 vmsppl 368 352 0 336 2 0 2 2 0 8 0 pdppl 4096 713 0 672 7 1 6 6 0 8 0 pvpl 32 173288 0 143177 243 0 243 243 0 265 0 pmappl 232 352 0 336 2 0 2 2 0 8 1 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 285 0 8 8 0 8 8 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff826fbff0) 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+0x17 kd_curproc sys/dev/kcov.c:558 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x17 sys/dev/kcov.c:143 __mp_lock(ffffffff82898390) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82898390) at __mp_lock+0x133 sys/kern/kern_lock.c:147 intr_handler(ffff8000234fb140,ffff80000065bd80) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge4_untramp() at Xintr_ioapic_edge4_untramp+0x19f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x43 sys/dev/kcov.c:149 __mp_lock(ffffffff82898390) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82898390) at __mp_lock+0x133 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x30 kd_curproc sys/dev/kcov.c:569 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x30 sys/dev/kcov.c:143 __mp_lock(ffffffff82898390) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82898390) at __mp_lock+0x133 sys/kern/kern_lock.c:147 pageflttrap(ffff8000234fb4a0,91568625fd8,1) at pageflttrap+0x70 sys/arch/amd64/amd64/trap.c:178 usertrap(ffff8000234fb4a0) at usertrap+0x210 sys/arch/amd64/amd64/trap.c:383 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffe8740, count: -16 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x18: addq $0x8,%rsp ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 witness_checkorder(fffffd806dcdbd68,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd806dcdbd68,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd806dcdbd58,81) at rw_enter+0xd4 rrw_enter(fffffd806dcdbd58,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd80673d8820,81) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:603 vn_lock(fffffd80673d8820,81) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 uvn_io(fffffd806dd2fd88,ffff800023508f58,1,2,0) at uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1196 uvn_get(fffffd806dd2fd88,4000,ffff8000235091b0,ffff80002350914c,0,3) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 uvm_fault(fffffd807efff2e0,1b2e524000,2,3) at uvm_fault+0x1197 sys/uvm/uvm_fault.c:1016 uvm_fault_wire(fffffd807efff2e0,1b2e520000,1b2f520000,3) at uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1285 uvm_map_pageable_wire(fffffd807efff2e0,fffffd80665c3768,0,771,ffffffff8105f2e0,0) at uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 sys_mlockall(ffff8000212d6020,ffff800023509388,ffff8000235093d0) at sys_mlockall+0x6a sys/uvm/uvm_mmap.c:828 syscall(ffff800023509450) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800023509450) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x91e7f4527f0, count: -14