login: witness: lock order reversal: 1st 0xffffffff8290fe50 netlock (netlock) 2nd 0xfffffd800872e188 vmmaplk (&map->lock) lock order "&map->lock"(rwlock) -> "netlock"(rwlock) first seen at: #0 rw_enter_write+0x5b sys/kern/kern_rwlock.c:128 #1 udp_sysctl+0x8a sys/netinet/udp_usrreq.c:1269 #2 sys_sysctl+0x209 sys/kern/kern_sysctl.c:249 #3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #4 Xsyscall+0x128 lock order "netlock"(rwlock) -> "&map->lock"(rwlock) first seen at: #0 rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 #1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 #2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 #3 uvm_fault+0x102 sys/uvm/uvm_fault.c:602 #4 kpageflttrap+0x209 #5 kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 #6 alltraps_kern_meltdown+0x7b #7 copyout+0x53 #8 ifioctl_get+0x2dd #9 soo_ioctl+0x26c #10 fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:307 #11 VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 #12 vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 #13 sys_ioctl+0x4a2 #14 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #14 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #15 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:440 witness_checkorder(fffffd800872e188,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd800872e188,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_read(fffffd800872e178) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff8000211bbd60,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 uvm_fault_check(ffff8000211bbd60,ffff8000211bbd98,ffff8000211bbdc0) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd800872e170,20004000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff8000211bbef0,200041f7) at kpageflttrap+0x209 kerntrap(ffff8000211bbef0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 ifioctl_get(c0106924,ffff8000211bc440) at ifioctl_get+0x2dd soo_ioctl(ffff8000211bc1a0,c0106924,ffff8000211bc440,ffff800021142548) at soo_ioctl+0x26c fifo_ioctl(ffff8000211bc288) at fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:307 VOP_IOCTL(fffffd806eec44d0,c0106924,ffff8000211bc440,3,fffffd807f7d8a20,ffff800021142548) at VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806e615600,c0106924,ffff8000211bc440,ffff800021142548) at vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 sys_ioctl(ffff800021142548,ffff8000211bc558,ffff8000211bc5b0) at sys_ioctl+0x4a2 syscall(ffff8000211bc620) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000211bc620) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe3810, count: -18 ddb{0}> show registers rdi 0x3 rsi 0xffffffff8294abb0 __sancov_gen_cov_switch_values.134 rbp 0xffff8000211bba50 rbx 0x3 rdx 0x3fd rcx 0 rax 0x1 r8 0xffff8000211bb9c0 r9 0x8080808080808080 r10 0xc12b07be5ed63e0f r11 0xf82b5537488ec965 r12 0xffffffff82ab0900 w_lodata+0x52f90 r13 0 r14 0xffffffff82aac910 w_lodata+0x4efa0 r15 0xfffffd8002f62d80 rip 0xffffffff8138d658 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000211bba40 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor4258206138) pid=477729 stat=onproc flags process=2 proc=0 pri=17, usrpri=52, nice=20 forw=0xffffffffffffffff, list=0xffff8000211427e8,0xffffffff82b3d400 process=0xffff8000ffff94d0 user=0xffff8000211b7000, vmspace=0xfffffd800872e170 estcpu=2, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND *16242 477729 36456 0 7 0x2 syz-executor4258206138 36456 405076 94374 0 3 0x10008a sigsusp ksh 94374 65530 91918 0 3 0x9a kqread sshd 84948 51440 1 0 3 0x100083 ttyin getty 91918 196869 1 0 3 0x88 kqread sshd 44516 225686 85172 73 3 0x1100090 kqread syslogd 85172 182253 1 0 3 0x100082 netio syslogd 36764 6232 1 0 3 0x100080 kqread resolvd 28961 96207 13667 77 3 0x100092 kqread dhcpleased 9876 117103 13667 77 3 0x100092 kqread dhcpleased 13667 410466 1 0 3 0x80 kqread dhcpleased 61858 271553 0 0 3 0x14200 bored smr 15588 416771 0 0 3 0x14200 pgzero zerothread 99835 20073 0 0 3 0x14200 aiodoned aiodoned 63287 151687 0 0 3 0x14200 syncer update 82843 150219 0 0 3 0x14200 cleaner cleaner 37181 111190 0 0 3 0x14200 reaper reaper 98556 77054 0 0 3 0x14200 pgdaemon pagedaemon 33262 45910 0 0 3 0x14200 bored viomb 12515 410526 0 0 3 0x40014200 acpi0 acpi0 84867 35831 0 0 7 0x40014200 idle1 67496 409908 0 0 3 0x14200 bored softnet 29852 249938 0 0 3 0x14200 bored systqmp 29850 392125 0 0 3 0x14200 bored systq 52049 251082 0 0 3 0x40014200 bored softclock 25321 246638 0 0 3 0x40014200 idle0 1 176171 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 16242 (syz-executor4258206138) thread 0xffff800021142548 (477729) shared rwlock netlock r = 0 (0xffffffff8290fe50) #0 witness_lock+0x44d #1 ifioctl_get+0x2d5 sys/net/if.c:2319 #2 soo_ioctl+0x26c #3 fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:307 #4 VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 #5 vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 #6 sys_ioctl+0x4a2 #7 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #7 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #8 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 1 (0xffffffff829de988) #0 witness_lock+0x44d #1 vn_ioctl+0x41 sys/kern/vfs_vnops.c:514 #2 sys_ioctl+0x4a2 #3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #4 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10143 6388K 6419K 78643K 11233 0 pcb 13 8K 8K 78643K 13 0 rtable 62 2K 2K 78643K 114 0 ifaddr 24 7K 7K 78643K 24 0 counters 40 33K 33K 78643K 40 0 ioctlops 0 0K 2K 78643K 25 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1167 73K 73K 78643K 1180 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 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 1 0K 0K 78643K 1 0 proc 55 74K 75K 78643K 226 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 11 0K 0K 78643K 11 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 25 122K 122K 78643K 25 0 exec 0 0K 2K 78643K 406 0 tdb 3 0K 0K 78643K 3 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 72 3K 5K 78643K 2044 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 3 0K 0K 78643K 3 0 temp 19 4690K 4753K 78643K 3118 0 kqueue 11 16K 18K 78643K 24 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 20 0 17 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 136 35 0 20 1 0 1 1 0 8 0 syncache 296 5 0 5 2 1 1 1 0 8 1 tcpcb 736 8 0 5 1 0 1 1 0 8 0 arp 120 2 0 0 1 0 1 1 0 8 0 inpcb 304 25 0 19 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 97 0 0 7 0 7 7 0 8 0 art_table 32 98 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1417 0 39 87 0 87 87 0 8 0 ffsino 272 1417 0 39 92 0 92 92 0 8 0 nchpl 144 1591 0 47 58 0 58 58 0 8 0 uvmvnodes 80 1426 0 0 30 0 30 30 0 8 0 vnodes 224 1426 0 0 84 0 84 84 0 8 0 namei 1024 4183 0 4183 1 0 1 1 0 8 1 percpumem 16 32 0 0 1 0 1 1 0 8 0 scxspl 216 3780 0 3780 2 1 1 2 0 8 1 plimitpl 152 15 0 9 1 0 1 1 0 8 0 sigapl 424 301 0 274 4 0 4 4 0 8 0 knotepl 120 45 0 0 2 0 2 2 0 8 0 kqueuepl 216 20 0 13 1 0 1 1 0 8 0 pipepl 336 82 0 79 1 0 1 1 0 8 0 fdescpl 496 287 0 274 3 1 2 3 0 8 0 filepl 152 1029 0 975 3 0 3 3 0 8 0 lockfpl 104 6 0 4 1 0 1 1 0 8 0 lockfspl 48 4 0 2 1 0 1 1 0 8 0 sessionpl 144 17 0 9 1 0 1 1 0 8 0 pgrppl 48 17 0 9 1 0 1 1 0 8 0 ucredpl 96 64 0 54 1 0 1 1 0 8 0 zombiepl 144 274 0 274 1 0 1 1 0 8 1 processpl 1064 301 0 274 3 1 2 3 0 8 0 procpl 672 301 0 274 3 0 3 3 0 8 0 sockpl 480 80 0 56 3 0 3 3 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 63 0 0 8 0 8 8 0 8 0 mtagpl 96 3 0 0 1 0 1 1 0 8 0 mbufpl 256 106 0 0 7 0 7 7 0 8 0 bufpl 288 1938 0 89 133 0 133 133 0 8 0 anonpl 24 38832 0 36784 16 2 14 15 0 186 1 amapchunkpl 152 3732 0 3606 7 1 6 7 0 158 0 amappl16 200 26 0 25 2 1 1 1 0 8 0 amappl15 192 62 0 59 1 0 1 1 0 8 0 amappl14 184 1 0 1 1 1 0 1 0 8 0 amappl13 176 32 0 31 2 1 1 1 0 8 0 amappl12 168 16 0 16 2 1 1 1 0 8 1 amappl11 160 38 0 28 1 0 1 1 0 8 0 amappl10 152 4 0 4 1 1 0 1 0 8 0 amappl9 144 444 0 442 1 0 1 1 0 8 0 amappl8 136 352 0 348 1 0 1 1 0 8 0 amappl7 128 60 0 57 1 0 1 1 0 8 0 amappl6 120 109 0 96 1 0 1 1 0 8 0 amappl5 112 171 0 162 1 0 1 1 0 8 0 amappl4 104 597 0 576 1 0 1 1 0 8 0 amappl3 96 115 0 106 1 0 1 1 0 8 0 amappl2 88 356 0 319 1 0 1 1 0 8 0 amappl1 80 8210 0 7859 9 0 9 9 0 8 0 amappl 88 1782 0 1726 2 0 2 2 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 72 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 287 0 274 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 287 0 274 1 0 1 1 0 8 0 vmmpekpl 168 5963 0 5949 1 0 1 1 0 8 0 vmmpepl 168 25037 0 24273 38 0 38 38 0 357 0 vmsppl 368 286 0 274 2 0 2 2 0 8 0 rwobjpl 56 9008 0 7072 28 0 28 28 0 8 0 pdppl 4096 581 0 548 54 21 33 41 0 8 0 pvpl 32 126588 0 122801 34 0 34 34 0 265 1 pmappl 248 286 0 274 2 1 1 2 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 402 0 23 11 0 11 11 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:440 witness_checkorder(fffffd800872e188,1,0) at witness_checkorder+0x10b7 witness_debugger sys/kern/subr_witness.c:2502 [inline] witness_checkorder(fffffd800872e188,1,0) at witness_checkorder+0x10b7 sys/kern/subr_witness.c:1105 rw_enter_read(fffffd800872e178) at rw_enter_read+0x66 sys/kern/kern_rwlock.c:112 uvmfault_lookup(ffff8000211bbd60,0) at uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1758 uvm_fault_check(ffff8000211bbd60,ffff8000211bbd98,ffff8000211bbdc0) at uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 uvm_fault(fffffd800872e170,20004000,0,2) at uvm_fault+0x102 sys/uvm/uvm_fault.c:602 kpageflttrap(ffff8000211bbef0,200041f7) at kpageflttrap+0x209 kerntrap(ffff8000211bbef0) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:318 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyout() at copyout+0x53 ifioctl_get(c0106924,ffff8000211bc440) at ifioctl_get+0x2dd soo_ioctl(ffff8000211bc1a0,c0106924,ffff8000211bc440,ffff800021142548) at soo_ioctl+0x26c fifo_ioctl(ffff8000211bc288) at fifo_ioctl+0x104 sys/miscfs/fifofs/fifo_vnops.c:307 VOP_IOCTL(fffffd806eec44d0,c0106924,ffff8000211bc440,3,fffffd807f7d8a20,ffff800021142548) at VOP_IOCTL+0x96 sys/kern/vfs_vops.c:264 vn_ioctl(fffffd806e615600,c0106924,ffff8000211bc440,ffff800021142548) at vn_ioctl+0xbc sys/kern/vfs_vnops.c:531 sys_ioctl(ffff800021142548,ffff8000211bc558,ffff8000211bc5b0) at sys_ioctl+0x4a2 syscall(ffff8000211bc620) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000211bc620) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe3810, count: -18 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800020ce8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206 sched_idle(ffff800020ce8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178 end trace frame: 0x0, count: -5 ddb{1}>