login: witness: lock order reversal: 1st 0xfffffd806d959c58 inode (&ip->i_lock) 2nd 0xffffffff8277e670 netlock (netlock) lock order "netlock"(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 vget+0x1c6 sys/kern/vfs_subr.c:671 #6 ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 #7 ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] #7 ktrstruct+0x169 sys/kern/kern_ktrace.c:311 #8 sys_connect+0x246 #9 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #9 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590 #10 Xsyscall+0x128 lock order "&ip->i_lock"(rrwlock) -> "netlock"(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_write+0x5b sys/kern/kern_rwlock.c:127 #2 uvn_get+0xeb uvm_vnode_lock sys/uvm/uvm_vnode.c:1501 [inline] #2 uvn_get+0xeb sys/uvm/uvm_vnode.c:993 #3 uvm_fault+0xa41 sys/uvm/uvm_fault.c:1073 #4 kpageflttrap+0x202 sys/arch/amd64/amd64/trap.c:265 #5 kerntrap+0xef sys/arch/amd64/amd64/trap.c:321 #6 alltraps_kern_meltdown+0x7b #7 copyin+0x53 #8 sys_connect+0x9b sys/kern/uipc_syscalls.c:362 #9 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #9 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590 #10 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(ffffffff8277e670,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(ffffffff8277e670,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter_write(ffffffff8277e660) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:127 uvn_get(fffffd806dd01098,0,ffff8000212818e8,ffff800021281884,0,1) at uvn_get+0xeb uvm_vnode_lock sys/uvm/uvm_vnode.c:1501 [inline] uvn_get(fffffd806dd01098,0,ffff8000212818e8,ffff800021281884,0,1) at uvn_get+0xeb sys/uvm/uvm_vnode.c:993 uvm_fault(fffffd807eff92e0,20000000,0,1) at uvm_fault+0xa41 sys/uvm/uvm_fault.c:1073 kpageflttrap(ffff800021281a10,20000000) at kpageflttrap+0x202 sys/arch/amd64/amd64/trap.c:265 kerntrap(ffff800021281a10) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:321 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x53 sys_connect(ffff8000211c2f68,ffff800021281bd8,ffff800021281c20) at sys_connect+0x9b sys/kern/uipc_syscalls.c:362 syscall(ffff800021281ca0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800021281ca0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa1ce7c9b900, count: -12 ddb{1}> show registers rdi 0x3 rsi 0xffffffff82748230 __sancov_gen_cov_switch_values.129 rbp 0xffff800021281550 rbx 0x3 rdx 0x8b rcx 0x3 rax 0x1 r8 0xffffffff81e34c43 witness_checkorder+0xf33 r9 0x5 r10 0x93c8d092c0afb425 r11 0xe78518eee4cf2a24 r12 0xffffffff8284bd70 w_lodata+0x4f1b0 r13 0 r14 0xffffffff8284ada0 w_lodata+0x4e1e0 r15 0xfffffd8002c975c0 rip 0xffffffff82243a18 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021281540 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor1110) pid=370833 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff8000211c2cd8,0xffff80002123ccf8 process=0xffff800021236110 user=0xffff80002127c000, vmspace=0xfffffd807eff92e0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 2332 231743 38822 0 2 0 syz-executor1110 2332 382824 38822 0 3 0x4000080 fsleep syz-executor1110 89897 137440 23066 0 7 0x1 syz-executor1110 89897 376959 23066 0 2 0x4000000 syz-executor1110 *89897 370833 23066 0 7 0x4000000 syz-executor1110 89897 236868 23066 0 3 0x4000080 fsleep syz-executor1110 23066 105723 32501 0 3 0x80 nanosleep syz-executor1110 38822 45265 32501 0 3 0x80 nanosleep syz-executor1110 32501 92898 44376 0 3 0x82 nanosleep syz-executor1110 44376 157798 89348 0 3 0x10008a pause ksh 89348 239575 43051 0 3 0x92 select sshd 15362 206872 1 0 3 0x100083 ttyin getty 43051 496708 1 0 3 0x80 select sshd 8200 383691 9562 74 3 0x100092 bpf pflogd 9562 82947 1 0 3 0x80 netio pflogd 20935 124804 1289 73 3 0x100090 kqread syslogd 1289 400314 1 0 3 0x100082 netio syslogd 13326 312889 1 77 3 0x100090 poll dhclient 47676 106257 1 0 3 0x80 poll dhclient 32424 107186 0 0 3 0x14200 bored smr 49553 410255 0 0 3 0x14200 pgzero zerothread 74612 391175 0 0 3 0x14200 aiodoned aiodoned 51704 299291 0 0 3 0x14200 syncer update 67424 202381 0 0 3 0x14200 cleaner cleaner 9856 222382 0 0 3 0x14200 reaper reaper 46383 365998 0 0 3 0x14200 pgdaemon pagedaemon 19252 30359 0 0 3 0x14200 bored crynlk 33678 462230 0 0 3 0x14200 bored crypto 99312 228822 0 0 3 0x14200 bored viomb 37336 394094 0 0 3 0x40014200 acpi0 acpi0 52084 441998 0 0 3 0x40014200 idle1 44993 134340 0 0 3 0x14200 bored softnet 92885 459870 0 0 3 0x14200 bored systqmp 96000 41783 0 0 3 0x14200 bored systq 63555 439254 0 0 3 0x40014200 bored softclock 31016 151544 0 0 3 0x40014200 idle0 1 56614 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 89897 (syz-executor1110) thread 0xffff8000211c2f68 (370833) exclusive rrwlock inode r = 0 (0xfffffd806d959c58) #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 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_get+0xd7 uvm_vnode_lock sys/uvm/uvm_vnode.c:1499 [inline] #5 uvn_get+0xd7 sys/uvm/uvm_vnode.c:993 #6 uvm_fault+0xa41 sys/uvm/uvm_fault.c:1073 #7 kpageflttrap+0x202 sys/arch/amd64/amd64/trap.c:265 #8 kerntrap+0xef sys/arch/amd64/amd64/trap.c:321 #9 alltraps_kern_meltdown+0x7b #10 copyin+0x53 #11 sys_connect+0x9b sys/kern/uipc_syscalls.c:362 #12 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] #12 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590 #13 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 1 (0xffffffff828cea78) #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:590 #2 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9474 6410K 6411K 78643K 10565 0 pcb 13 8K 8K 78643K 13 0 rtable 61 2K 2K 78643K 127 0 ifaddr 29 8K 8K 78643K 30 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 4K 78643K 1467 0 mount 1 1K 1K 78643K 1 0 vnodes 1183 74K 75K 78643K 1188 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 1825 197K 290K 78643K 13109 0 file desc 1 0K 0K 78643K 1 0 proc 59 63K 71K 78643K 367 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 19 95K 95K 78643K 19 0 exec 0 0K 2K 78643K 302 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 48 18K 18K 78643K 1613 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 4 0K 0K 78643K 4 0 temp 23 3949K 4013K 78643K 52107 0 kqueue 2 2K 2K 78643K 2 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 2 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 120 15 0 13 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 120 29 0 19 1 0 1 1 0 8 0 syncache 296 5 0 5 2 1 1 1 0 8 1 tcpcb 736 427 0 379 6 0 6 6 0 8 1 inpcb 296 1285 0 1273 2 0 2 2 0 8 1 pfosfp 40 1428 0 1005 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 8 0 2 1 0 1 1 0 8 0 pfstkey 112 8 0 2 1 0 1 1 0 8 0 pfstate 328 8 0 2 1 0 1 1 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 96 0 0 6 0 6 6 0 8 0 art_table 32 97 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 1404 0 16 87 0 87 87 0 8 0 ffsino 272 1404 0 16 93 0 93 93 0 8 0 nchpl 144 1585 0 33 59 1 58 58 0 8 0 uvmvnodes 72 1414 0 0 26 0 26 26 0 8 0 vnodes 208 1414 0 0 75 0 75 75 0 8 0 namei 1024 5037 0 5037 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 216 4104 0 4104 10 7 3 8 0 8 3 plimitpl 152 16 0 8 1 0 1 1 0 8 0 sigapl 424 433 0 400 4 0 4 4 0 8 0 futexpl 56 3390 0 3388 1 0 1 1 0 8 0 knotepl 112 5 0 0 1 0 1 1 0 8 0 kqueuepl 152 1 0 0 1 0 1 1 0 8 0 pipepl 304 64 0 60 2 1 1 1 0 8 0 fdescpl 496 417 0 400 3 0 3 3 0 8 0 filepl 152 3051 0 2991 3 0 3 3 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 144 20 0 9 1 0 1 1 0 8 0 pgrppl 48 20 0 9 1 0 1 1 0 8 0 ucredpl 96 62 0 53 1 0 1 1 0 8 0 zombiepl 144 400 0 400 2 1 1 1 0 8 1 processpl 1056 433 0 400 3 0 3 3 0 8 0 procpl 656 1027 0 990 4 0 4 4 0 8 0 sockpl 400 1329 0 1305 3 0 3 3 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 81 0 0 10 0 10 10 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 100 0 0 6 0 6 6 0 8 0 bufpl 280 2517 0 112 172 0 172 172 0 8 0 anonpl 16 32388 0 31048 8 2 6 7 0 124 0 amapchunkpl 152 1929 0 1880 4 1 3 3 0 158 0 amappl16 192 294 0 289 1 0 1 1 0 8 0 amappl15 184 1 0 1 1 1 0 1 0 8 0 amappl14 176 22 0 19 1 0 1 1 0 8 0 amappl13 168 15 0 14 2 1 1 1 0 8 0 amappl12 160 3 0 3 1 1 0 1 0 8 0 amappl11 152 50 0 35 1 0 1 1 0 8 0 amappl10 144 9 0 7 1 0 1 1 0 8 0 amappl9 136 202 0 202 2 2 0 1 0 8 0 amappl8 128 274 0 268 1 0 1 1 0 8 0 amappl7 120 210 0 209 1 0 1 1 0 8 0 amappl6 112 55 0 48 1 0 1 1 0 8 0 amappl5 104 353 0 337 1 0 1 1 0 8 0 amappl4 96 278 0 257 1 0 1 1 0 8 0 amappl3 88 104 0 97 1 0 1 1 0 8 0 amappl2 80 2537 0 2468 3 1 2 2 0 8 0 amappl1 72 21909 0 21425 15 5 10 15 0 8 0 amappl 80 1211 0 1181 1 0 1 1 0 84 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 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 417 0 400 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 417 0 400 1 0 1 1 0 8 0 vmmpekpl 168 7298 0 7279 2 0 2 2 0 8 1 vmmpepl 168 48836 0 47820 57 11 46 48 0 357 1 vmsppl 368 416 0 400 2 0 2 2 0 8 0 pdppl 4096 841 0 800 59 18 41 41 0 8 0 pvpl 32 106841 0 103598 33 5 28 28 0 265 1 pmappl 232 416 0 400 1 0 1 1 0 8 0 extentpl 40 57 0 39 1 0 1 1 0 8 0 phpool 112 284 0 22 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(ffffffff8272eff0) 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(ffffffff828ce870) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828ce870) at __mp_lock+0x129 sys/kern/kern_lock.c:147 intr_handler(ffff800021269340,ffff80000065a300) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge4_untramp() at Xintr_ioapic_edge4_untramp+0x19f __mp_lock(ffffffff828ce870) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828ce870) at __mp_lock+0x129 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f __mp_lock(ffffffff828ce870) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828ce870) at __mp_lock+0x122 sys/kern/kern_lock.c:147 ktrstruct(ffff8000ffff7720,ffffffff823b8f04,ffff800021269678,10) at ktrstruct+0xee sys_clock_gettime(ffff8000ffff7720,ffff8000212696e0,ffff800021269730) at sys_clock_gettime+0xfb sys/kern/kern_time.c:171 syscall(ffff8000212697b0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000212697b0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe1a70, count: -14 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(ffffffff8277e670,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(ffffffff8277e670,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter_write(ffffffff8277e660) at rw_enter_write+0x5b sys/kern/kern_rwlock.c:127 uvn_get(fffffd806dd01098,0,ffff8000212818e8,ffff800021281884,0,1) at uvn_get+0xeb uvm_vnode_lock sys/uvm/uvm_vnode.c:1501 [inline] uvn_get(fffffd806dd01098,0,ffff8000212818e8,ffff800021281884,0,1) at uvn_get+0xeb sys/uvm/uvm_vnode.c:993 uvm_fault(fffffd807eff92e0,20000000,0,1) at uvm_fault+0xa41 sys/uvm/uvm_fault.c:1073 kpageflttrap(ffff800021281a10,20000000) at kpageflttrap+0x202 sys/arch/amd64/amd64/trap.c:265 kerntrap(ffff800021281a10) at kerntrap+0xef sys/arch/amd64/amd64/trap.c:321 alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b copyin() at copyin+0x53 sys_connect(ffff8000211c2f68,ffff800021281bd8,ffff800021281c20) at sys_connect+0x9b sys/kern/uipc_syscalls.c:362 syscall(ffff800021281ca0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800021281ca0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa1ce7c9b900, count: -12 ddb{1}>