login: witness: lock order reversal: 1st 0xfffffd807efffb98 vmmaplk (&map->lock) 2nd 0xfffffd8056c791a8 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_mlock+0x180 sys/uvm/uvm_mmap.c:767 #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(fffffd8056c791a8,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd8056c791a8,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd8056c79198,81) at rw_enter+0xd4 rrw_enter(fffffd8056c79198,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd80572c2280,81) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:603 vn_lock(fffffd80572c2280,81) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 uvn_io(fffffd80570649e8,ffff8000256ffc28,1,2,0) at uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1196 uvn_get(fffffd80570649e8,0,ffff8000256ffe80,ffff8000256ffe1c,0,1) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 uvm_fault(fffffd807efffb80,20002000,2,1) at uvm_fault+0x1197 sys/uvm/uvm_fault.c:1016 uvm_fault_wire(fffffd807efffb80,20002000,20003000,1) at uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1285 uvm_map_pageable_wire(fffffd807efffb80,fffffd8056bb86a8,fffffd8056bb8de0,116,0,0) at uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 sys_mlock(ffff8000ffffa780,ffff800025700068,ffff8000257000b0) at sys_mlock+0x180 sys/uvm/uvm_mmap.c:767 syscall(ffff800025700130) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800025700130) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa2eb6d47ab0, count: -14 ddb{1}> show registers rdi 0x3 rsi 0x40000 acpi_pdirpa+0x2be68 rbp 0xffff8000256ff880 rbx 0x3 rdx 0xffff800000af4b40 rcx 0x3 rax 0x3ffff acpi_pdirpa+0x2be67 r8 0xffffffff817c2c03 witness_checkorder+0xf33 r9 0x5 r10 0x35d738fae3d97348 r11 0xfd8fb22be1027c28 r12 0xffffffff82869ef0 w_lodata+0x544e0 r13 0 r14 0xffffffff82863a90 w_lodata+0x4e080 r15 0xfffffd8002c8a480 rip 0xffffffff81878348 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000256ff870 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=158545 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffffa508,0xffff8000ffffac80 process=0xffff8000ffff8bd8 user=0xffff8000256fb000, vmspace=0xfffffd807efffb80 estcpu=36, cpticks=4, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 51711 301970 29343 32767 7 0x10 syz-executor.0 51711 201424 29343 32767 2 0x4000010 syz-executor.0 52285 166000 75451 32767 2 0x10 syz-executor.1 *52285 158545 75451 32767 7 0x4000010 syz-executor.1 75451 512240 81179 32767 3 0x90 nanosleep syz-executor.1 29343 114067 4134 32767 3 0x90 nanosleep syz-executor.0 81179 291556 45896 0 3 0x82 wait syz-executor.1 4134 441843 45896 0 3 0x82 wait syz-executor.0 45896 39130 65440 0 3 0x82 thrsleep syz-fuzzer 45896 285573 65440 0 3 0x4000082 thrsleep syz-fuzzer 45896 130228 65440 0 3 0x4000082 thrsleep syz-fuzzer 45896 292051 65440 0 3 0x4000082 thrsleep syz-fuzzer 45896 217096 65440 0 3 0x4000082 thrsleep syz-fuzzer 45896 346365 65440 0 3 0x4000082 thrsleep syz-fuzzer 45896 54207 65440 0 3 0x4000082 thrsleep syz-fuzzer 45896 278394 65440 0 3 0x4000082 kqread syz-fuzzer 65440 458753 88249 0 3 0x10008a pause ksh 88249 511161 80235 0 3 0x92 select sshd 52505 351211 1 0 3 0x100083 ttyin getty 80235 482781 1 0 3 0x80 select sshd 54335 387176 87461 73 3 0x100090 kqread syslogd 87461 405782 1 0 3 0x100082 netio syslogd 51924 426404 1 77 3 0x100090 poll dhclient 19579 34123 1 0 3 0x80 poll dhclient 8480 507223 0 0 3 0x14200 bored smr 74215 105911 0 0 2 0x14200 zerothread 62561 398488 0 0 3 0x14200 aiodoned aiodoned 55559 106914 0 0 3 0x14200 syncer update 70069 157873 0 0 3 0x14200 cleaner cleaner 59385 169163 0 0 3 0x14200 reaper reaper 54356 201296 0 0 3 0x14200 pgdaemon pagedaemon 22482 298063 0 0 3 0x14200 bored crynlk 13653 64170 0 0 3 0x14200 bored crypto 24836 23929 0 0 3 0x40014200 acpi0 acpi0 94006 477975 0 0 3 0x40014200 idle1 25688 130468 0 0 3 0x14200 bored softnet 80690 74778 0 0 3 0x14200 bored systqmp 29824 74033 0 0 3 0x14200 bored systq 60542 322002 0 0 3 0x40014200 bored softclock 68303 356568 0 0 3 0x40014200 idle0 1 446606 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 52285 (syz-executor.1) thread 0xffff8000ffffa780 (158545) shared rwlock vmmaplk r = 0 (0xfffffd807efffb98) #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:767 #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 (0xffffffff82889918) #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 9462 6330K 6330K 78643K 10554 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 19 0 iov 0 0K 0K 78643K 1 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 3 0K 0K 78643K 3 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1824 197K 290K 78643K 13058 0 file desc 8 25K 33K 78643K 53 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 31 148K 148K 78643K 31 0 exec 0 0K 2K 78643K 318 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 525 70K 70K 78643K 1167 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 63 3952K 4016K 78643K 1843 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 19 0 17 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 31 0 23 1 0 1 1 0 8 0 syncache 272 4 0 4 1 1 0 1 0 8 0 tcpqe 32 1167 0 1167 5 5 0 5 0 8 0 tcpcb 592 11 0 6 1 0 1 1 0 8 0 inpcb 296 37 0 29 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 256 189 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 semapl 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 1433 0 36 88 0 88 88 0 8 0 ffsino 272 1433 0 36 94 0 94 94 0 8 0 nchpl 144 1673 0 74 60 0 60 60 0 8 0 uvmvnodes 72 1476 0 0 27 0 27 27 0 8 0 vnodes 208 1476 0 0 78 0 78 78 0 8 0 namei 1024 4080 0 4080 2 1 1 1 0 8 1 percpumem 16 32 0 0 1 0 1 1 0 8 0 scxspl 192 5061 0 5061 10 9 1 7 0 8 1 plimitpl 152 16 0 7 1 0 1 1 0 8 0 sigapl 424 240 0 208 4 0 4 4 0 8 0 futexpl 56 268 0 268 1 0 1 1 0 8 1 knotepl 112 62 0 42 1 0 1 1 0 8 0 kqueuepl 152 52 0 50 1 0 1 1 0 8 0 pipepl 304 69 0 58 1 0 1 1 0 8 0 fdescpl 496 225 0 208 3 0 3 3 0 8 0 filepl 152 1076 0 972 6 1 5 5 0 8 0 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 17 0 7 1 0 1 1 0 8 0 ucredpl 96 60 0 51 1 0 1 1 0 8 0 zombiepl 144 208 0 208 2 1 1 1 0 8 1 processpl 1008 240 0 208 5 0 5 5 0 8 0 procpl 632 276 0 235 4 0 4 4 0 8 0 sockpl 400 87 0 69 3 0 3 3 0 8 1 mcl4k 4096 5 0 0 1 0 1 1 0 8 0 mcl2k 2048 701 0 0 87 0 87 87 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 708 0 0 44 0 44 44 0 8 0 bufpl 280 3432 0 173 233 0 233 233 0 8 0 anonpl 16 153701 0 57637 391 2 389 389 0 124 0 amapchunkpl 152 5813 0 1911 152 1 151 151 0 158 0 amappl16 192 2442 0 134 116 0 116 116 0 8 0 amappl15 184 5 0 3 1 0 1 1 0 8 0 amappl14 176 26 0 18 1 0 1 1 0 8 0 amappl13 168 50 0 44 1 0 1 1 0 8 0 amappl12 160 16 0 11 1 0 1 1 0 8 0 amappl11 152 46 0 35 1 0 1 1 0 8 0 amappl10 144 11 0 7 1 0 1 1 0 8 0 amappl9 136 370 0 369 2 1 1 1 0 8 0 amappl8 128 131 0 93 2 0 2 2 0 8 0 amappl7 120 219 0 210 1 0 1 1 0 8 0 amappl6 112 62 0 51 1 0 1 1 0 8 0 amappl5 104 337 0 321 1 0 1 1 0 8 0 amappl4 96 246 0 224 1 0 1 1 0 8 0 amappl3 88 147 0 130 1 0 1 1 0 8 0 amappl2 80 996 0 927 2 0 2 2 0 8 0 amappl1 72 14647 0 14152 23 12 11 18 0 8 1 amappl 80 934 0 459 10 0 10 10 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 24 225 0 208 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 225 0 208 1 0 1 1 0 8 0 vmmpekpl 168 5809 0 5781 3 1 2 2 0 8 0 vmmpepl 168 41873 0 37737 290 9 281 281 0 357 101 vmsppl 368 224 0 208 2 0 2 2 0 8 0 pdppl 4096 457 0 416 6 0 6 6 0 8 0 pvpl 32 247500 0 147737 805 0 805 805 0 265 0 pmappl 232 224 0 208 2 0 2 2 0 8 1 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 346 0 4 10 0 10 10 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff826faff0) 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(ffffffff82889710) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff82889710) at __mp_lock+0x129 sys/kern/kern_lock.c:147 intr_handler(ffff80002570e1f0,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+0x4f sys/dev/kcov.c:149 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f end of kernel end trace frame: 0x7f7fffffadf0, count: -9 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(fffffd8056c791a8,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd8056c791a8,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd8056c79198,81) at rw_enter+0xd4 rrw_enter(fffffd8056c79198,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd80572c2280,81) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:603 vn_lock(fffffd80572c2280,81) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 uvn_io(fffffd80570649e8,ffff8000256ffc28,1,2,0) at uvn_io+0x2b5 sys/uvm/uvm_vnode.c:1196 uvn_get(fffffd80570649e8,0,ffff8000256ffe80,ffff8000256ffe1c,0,1) at uvn_get+0x226 sys/uvm/uvm_vnode.c:1056 uvm_fault(fffffd807efffb80,20002000,2,1) at uvm_fault+0x1197 sys/uvm/uvm_fault.c:1016 uvm_fault_wire(fffffd807efffb80,20002000,20003000,1) at uvm_fault_wire+0x63 sys/uvm/uvm_fault.c:1285 uvm_map_pageable_wire(fffffd807efffb80,fffffd8056bb86a8,fffffd8056bb8de0,116,0,0) at uvm_map_pageable_wire+0x30d sys/uvm/uvm_map.c:2367 sys_mlock(ffff8000ffffa780,ffff800025700068,ffff8000257000b0) at sys_mlock+0x180 sys/uvm/uvm_mmap.c:767 syscall(ffff800025700130) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800025700130) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:567 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa2eb6d47ab0, count: -14