witness: lock order reversal: 1st 0xffffffff8277e670 netlock (netlock) 2nd 0xfffffd806d95cb48 inode (&ip->i_lock) 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 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 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(fffffd806d95cb48,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd806d95cb48,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd806d95cb38,1) at rw_enter+0xd4 rrw_enter(fffffd806d95cb38,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd806d9479e0,2001) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:614 vn_lock(fffffd806d9479e0,2001) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 vget(fffffd806d9479e0,2001) at vget+0x1c6 sys/kern/vfs_subr.c:671 ktrwriteraw(ffff8000ffff62a0,fffffd806d9479e0,fffffd807f7b7a20,ffff800021256fb0,ffff800021256f90) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff8000ffff62a0,ffffffff823afafa,fffffd806f685020,10) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff8000ffff62a0,ffffffff823afafa,fffffd806f685020,10) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_connect(ffff8000ffff62a0,ffff8000212570f8,ffff800021257140) at sys_connect+0x246 syscall(ffff8000212571c0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000212571c0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff7700, count: -12 ddb{1}> show registers rdi 0x3 rsi 0xffffffff82748230 __sancov_gen_cov_switch_values.129 rbp 0xffff800021256bc0 rbx 0x3 rdx 0x8b rcx 0x3 rax 0x1 r8 0xffffffff81e34c43 witness_checkorder+0xf33 r9 0x5 r10 0x4c8e2b2814ec0ddb r11 0xa2a1f000558e67b5 r12 0xffffffff8284c2f0 w_lodata+0x4f730 r13 0 r14 0xffffffff8284c240 w_lodata+0x4f680 r15 0xfffffd8002c9b500 rip 0xffffffff82243a18 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021256bb0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor1584) pid=302653 stat=onproc flags process=2 proc=1 pri=17, usrpri=52, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff67c0,0xffffffff828e9418 process=0xffff8000212375b0 user=0xffff800021252000, vmspace=0xfffffd806e93f8a8 estcpu=2, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *51336 302653 84077 0 7 0x3 syz-executor1584 84077 52317 99949 0 3 0x10008a pause ksh 99949 122278 17718 0 3 0x92 select sshd 94583 294790 1 0 3 0x100083 ttyin getty 17718 144098 1 0 3 0x80 select sshd 3821 78474 93020 74 3 0x100092 bpf pflogd 93020 357117 1 0 3 0x80 netio pflogd 24669 81746 7856 73 3 0x100090 kqread syslogd 7856 467612 1 0 3 0x100082 netio syslogd 22732 468064 1 77 3 0x100090 poll dhclient 98556 158448 1 0 3 0x80 poll dhclient 73584 90685 0 0 3 0x14200 bored smr 50517 29306 0 0 3 0x14200 pgzero zerothread 12470 346654 0 0 3 0x14200 aiodoned aiodoned 71962 341864 0 0 3 0x14200 syncer update 76674 41497 0 0 3 0x14200 cleaner cleaner 58511 296259 0 0 3 0x14200 reaper reaper 35112 351548 0 0 3 0x14200 pgdaemon pagedaemon 47776 416066 0 0 3 0x14200 bored crynlk 5296 120071 0 0 3 0x14200 bored crypto 8780 503052 0 0 3 0x14200 bored viomb 44738 73602 0 0 3 0x40014200 acpi0 acpi0 24823 515200 0 0 3 0x40014200 idle1 79885 424571 0 0 3 0x14200 bored softnet 28507 106394 0 0 3 0x14200 bored systqmp 75046 17946 0 0 3 0x14200 bored systq 82731 522933 0 0 3 0x40014200 bored softclock 70734 56280 0 0 7 0x40014200 idle0 1 111404 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 51336 (syz-executor1584) thread 0xffff8000ffff62a0 (302653) exclusive rwlock netlock r = 0 (0xffffffff8277e670) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1164 #1 uvn_io+0x31d sys/uvm/uvm_vnode.c:1224 #2 uvn_get+0x473 sys/uvm/uvm_vnode.c:1083 #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 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 15 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 37 2K 2K 78643K 594 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 1690 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 8 0 5 1 0 1 1 0 8 0 inpcb 296 30 0 23 1 0 1 1 0 8 0 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 0 1 0 1 1 0 8 0 pfstkey 112 8 0 0 1 0 1 1 0 8 0 pfstate 328 8 0 0 1 0 1 1 0 8 0 pfrule 1360 21 0 15 2 0 2 2 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 1399 0 16 87 0 87 87 0 8 0 ffsino 272 1399 0 16 93 0 93 93 0 8 0 nchpl 144 1573 0 33 59 1 58 58 0 8 0 uvmvnodes 72 1409 0 0 26 0 26 26 0 8 0 vnodes 208 1409 0 0 75 0 75 75 0 8 0 namei 1024 3783 0 3783 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 216 3297 0 3297 2 1 1 2 0 8 1 plimitpl 152 14 0 8 1 0 1 1 0 8 0 sigapl 424 221 0 192 4 0 4 4 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 496 205 0 192 3 0 3 3 0 8 0 filepl 152 960 0 909 2 0 2 2 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 18 0 9 1 0 1 1 0 8 0 pgrppl 48 18 0 9 1 0 1 1 0 8 0 ucredpl 96 62 0 53 1 0 1 1 0 8 0 zombiepl 144 192 0 192 2 1 1 1 0 8 1 processpl 1056 221 0 192 3 0 3 3 0 8 0 procpl 656 221 0 192 3 0 3 3 0 8 0 sockpl 400 74 0 55 2 0 2 2 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 67 0 0 9 0 9 9 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 87 0 0 6 0 6 6 0 8 0 bufpl 280 1934 0 112 131 0 131 131 0 8 0 anonpl 16 19596 0 18363 8 2 6 7 0 124 1 amapchunkpl 152 527 0 490 3 1 2 3 0 158 0 amappl16 192 80 0 76 1 0 1 1 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 22 0 19 1 0 1 1 0 8 0 amappl13 168 14 0 13 2 1 1 1 0 8 0 amappl12 160 5 0 5 1 1 0 1 0 8 0 amappl11 152 47 0 32 1 0 1 1 0 8 0 amappl10 144 10 0 7 1 0 1 1 0 8 0 amappl9 136 197 0 197 2 1 1 1 0 8 1 amappl8 128 62 0 61 1 0 1 1 0 8 0 amappl7 120 211 0 210 1 0 1 1 0 8 0 amappl6 112 57 0 50 1 0 1 1 0 8 0 amappl5 104 357 0 340 1 0 1 1 0 8 0 amappl4 96 283 0 258 1 0 1 1 0 8 0 amappl3 88 104 0 97 1 0 1 1 0 8 0 amappl2 80 854 0 802 3 1 2 2 0 8 0 amappl1 72 14320 0 13898 15 5 10 15 0 8 0 amappl 80 403 0 383 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 24 205 0 192 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 205 0 192 1 0 1 1 0 8 0 vmmpekpl 168 5583 0 5565 1 0 1 1 0 8 0 vmmpepl 168 29906 0 29079 48 8 40 48 0 357 2 vmsppl 368 204 0 192 2 0 2 2 0 8 0 pdppl 4096 417 0 384 47 14 33 39 0 8 0 pvpl 32 80559 0 77564 29 1 28 28 0 265 1 pmappl 232 204 0 192 1 0 1 1 0 8 0 extentpl 40 57 0 39 1 0 1 1 0 8 0 phpool 112 266 0 17 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+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828ce870) at __mp_lock+0x122 sys/kern/kern_lock.c:147 intr_handler(ffff80002117ed20,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+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828ce870) at __mp_lock+0x122 sys/kern/kern_lock.c:147 softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90 Xsoftclock() at Xsoftclock+0x1f acpicpu_idle() at acpicpu_idle+0x2eb sys/dev/acpi/acpicpu.c:1206 sched_idle(ffffffff8272eff0) at sched_idle+0x417 sys/kern/kern_sched.c:178 end trace frame: 0x0, count: -11 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(fffffd806d95cb48,9,0) at witness_checkorder+0xf5a witness_debugger sys/kern/subr_witness.c:2490 [inline] witness_checkorder(fffffd806d95cb48,9,0) at witness_checkorder+0xf5a sys/kern/subr_witness.c:1087 rw_enter(fffffd806d95cb38,1) at rw_enter+0xd4 rrw_enter(fffffd806d95cb38,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:462 VOP_LOCK(fffffd806d9479e0,2001) at VOP_LOCK+0x4b sys/kern/vfs_vops.c:614 vn_lock(fffffd806d9479e0,2001) at vn_lock+0x6c sys/kern/vfs_vnops.c:575 vget(fffffd806d9479e0,2001) at vget+0x1c6 sys/kern/vfs_subr.c:671 ktrwriteraw(ffff8000ffff62a0,fffffd806d9479e0,fffffd807f7b7a20,ffff800021256fb0,ffff800021256f90) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff8000ffff62a0,ffffffff823afafa,fffffd806f685020,10) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff8000ffff62a0,ffffffff823afafa,fffffd806f685020,10) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_connect(ffff8000ffff62a0,ffff8000212570f8,ffff800021257140) at sys_connect+0x246 syscall(ffff8000212571c0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000212571c0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff7700, count: -12 ddb{1}>