witness: lock order reversal: 1st 0xfffffd806e6e6c08 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd806e2c03d0 inode (&ip->i_lock) lock order data w2 -> w1 missing lock order data w1 -> w2 missing 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:398 witness_checkorder(fffffd806e2c03d0,9,0) at witness_checkorder+0x108b rw_enter(fffffd806e2c03c0,1) at rw_enter+0xd4 rrw_enter(fffffd806e2c03c0,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd806737aa98,2001) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd806737aa98,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 vget(fffffd806737aa98,2001) at vget+0x1f7 sys/kern/vfs_subr.c:676 ktrwriteraw(ffff800021273260,fffffd806737aa98,fffffd807f7d8a80,ffff8000222d6fd0,ffff8000222d6fb0) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff800021273260,ffffffff823bc3dc,ffff8000222d70b8,8) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff800021273260,ffffffff823bc3dc,ffff8000222d70b8,8) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_socketpair(ffff800021273260,ffff8000222d7128,ffff8000222d7170) at sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 syscall(ffff8000222d71f0) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000222d71f0) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3e629819fa0, count: -12 ddb{0}> show registers rdi 0xffff8000234c2000 rsi 0x16fea acpi_pdirpa+0x2e52 rbp 0xffff8000222d6be0 rbx 0x3 rdx 0xffff8000234c2000 rcx 0x16fe9 acpi_pdirpa+0x2e51 rax 0xffffffff815b7917 db_enter+0x17 r8 0xffffffff811906c1 witness_checkorder+0x1061 r9 0x5 r10 0x697960e8ac5115d1 r11 0x793cc5781961582c r12 0 r13 0xfffffd806e2c03d0 r14 0 r15 0xfffffd8002cfc740 rip 0xffffffff815b7918 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff8000222d6bd0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=229966 stat=onproc flags process=0 proc=4000001 pri=32, usrpri=81, nice=20 forw=0xffffffffffffffff, list=0xffff800021273500,0xffffffff828eba78 process=0xffff800021224cb8 user=0xffff8000222d2000, vmspace=0xfffffd80084da5c0 estcpu=31, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 87914 85240 68425 0 2 0 syz-executor.1 *87914 229966 68425 0 7 0x4000001 syz-executor.1 70523 376509 50680 0 7 0 syz-executor.0 70523 359557 50680 0 3 0x4000080 fsleep syz-executor.0 68425 169436 35041 0 3 0x82 nanoslp syz-executor.1 50680 405337 35041 0 3 0x82 nanoslp syz-executor.0 35041 126081 25192 0 3 0x82 thrsleep syz-fuzzer 35041 2319 25192 0 3 0x4000082 thrsleep syz-fuzzer 35041 10680 25192 0 3 0x4000082 kqread syz-fuzzer 35041 230952 25192 0 3 0x4000082 thrsleep syz-fuzzer 35041 221137 25192 0 3 0x4000082 thrsleep syz-fuzzer 35041 235105 25192 0 3 0x4000082 thrsleep syz-fuzzer 35041 420353 25192 0 3 0x4000082 thrsleep syz-fuzzer 35041 246439 25192 0 3 0x4000082 thrsleep syz-fuzzer 25192 331702 82208 0 3 0x10008a sigsusp ksh 82208 46608 73205 0 3 0x92 select sshd 35358 262461 1 0 3 0x100083 ttyin getty 73205 182987 1 0 3 0x80 select sshd 42908 467053 31313 74 3 0x100092 bpf pflogd 31313 6915 1 0 3 0x80 netio pflogd 2994 98074 53057 73 3 0x100090 kqread syslogd 53057 227778 1 0 3 0x100082 netio syslogd 62119 100376 1 77 3 0x100090 poll dhclient 51873 158344 1 0 3 0x80 poll dhclient 22588 488685 0 0 3 0x14200 bored smr 83939 517170 0 0 2 0x14200 zerothread 90263 380506 0 0 3 0x14200 aiodoned aiodoned 59164 236591 0 0 3 0x14200 syncer update 12306 393969 0 0 3 0x14200 cleaner cleaner 18956 34565 0 0 3 0x14200 reaper reaper 16660 297035 0 0 3 0x14200 pgdaemon pagedaemon 2408 235573 0 0 3 0x14200 bored crynlk 70296 451813 0 0 3 0x14200 bored crypto 1216 71438 0 0 3 0x14200 bored viomb 11547 442937 0 0 3 0x40014200 acpi0 acpi0 37062 15730 0 0 3 0x40014200 idle1 50339 206499 0 0 3 0x14200 bored softnet 11674 433251 0 0 3 0x14200 bored systqmp 58619 394411 0 0 3 0x14200 bored systq 30629 495053 0 0 3 0x40014200 bored softclock 39156 197604 0 0 3 0x40014200 idle0 1 214287 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 87914 (syz-executor.1) thread 0xffff800021273260 (229966) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828bbff8) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 ktrstruct+0xee #2 sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 #3 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] #3 syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 #4 Xsyscall+0x128 exclusive rwlock fdlock r = 0 (0xfffffd806e6e6c08) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 sys_socketpair+0x219 #2 syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] #2 syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 #3 Xsyscall+0x128 Process 70523 (syz-executor.0) thread 0xffff800021272000 (376509) shared rwlock vmmaplk r = 0 (0xfffffd80084daa28) #0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline] #0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182 #1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1701 #2 uvm_fault_check+0x3a sys/uvm/uvm_fault.c:674 #3 uvm_fault+0x102 sys/uvm/uvm_fault.c:601 #4 upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:179 #5 usertrap+0x21a sys/arch/amd64/amd64/trap.c:401 #6 recall_trap+0x8 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10136 6502K 6511K 78643K 15800 0 pcb 13 8K 8K 78643K 1740 0 rtable 117 3K 3K 78643K 207 0 ifaddr 44 10K 10K 78643K 45 0 counters 44 34K 34K 78643K 44 0 ioctlops 0 0K 4K 78643K 14435 0 iov 0 0K 8K 78643K 932 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 1 0 vnodes 1212 76K 77K 78643K 4380 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 619 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 719 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 6 17K 25K 78643K 53081 0 sigio 0 0K 0K 78643K 696 0 proc 59 63K 95K 78643K 437 0 subproc 32 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 55 254K 254K 78643K 55 0 exec 0 0K 2K 78643K 356 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 259 28K 29K 78643K 648930 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 6 0K 0K 78643K 10 0 temp 107 3981K 4049K 78643K 159837 0 kqueue 3 4K 11K 78643K 7181 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 20 0 0 1 0 1 1 0 8 0 rtpcb 120 19 0 17 1 0 1 1 0 8 0 rtentry 112 51 0 1 2 0 2 2 0 8 0 unpcb 120 56542 0 56530 40 38 2 2 0 8 1 syncache 296 4 0 4 1 1 0 1 0 8 0 sackhl 24 3 0 3 3 3 0 1 0 8 0 tcpcb 736 453 0 449 9 8 1 5 0 8 0 arp 120 6 0 0 1 0 1 1 0 8 0 inpcb 304 4041 0 4035 1 0 1 1 0 8 0 nd6 48 12 0 0 1 0 1 1 0 8 0 kcovpl 48 2 0 0 1 0 1 1 0 8 0 pffrag 232 22 0 22 4 4 0 2 0 482 0 pffrnode 88 19 0 19 3 3 0 1 0 8 0 pffrent 40 532 0 532 3 3 0 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 24 175 0 170 1 0 1 1 0 8 0 pfstkey 112 175 0 170 4 3 1 4 0 8 0 pfstate 320 175 0 170 9 8 1 9 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 256 211 0 0 14 0 14 14 0 8 0 art_table 32 212 0 0 2 0 2 2 0 8 0 art_node 16 50 0 4 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 0 1 0 1 1 0 8 0 semapl 112 717 0 707 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 63845 0 62434 89 0 89 89 0 8 0 ffsino 272 63845 0 62434 95 0 95 95 0 8 0 nchpl 144 134994 0 133383 60 0 60 60 0 8 0 uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 324648 0 324648 1 0 1 1 0 8 1 percpumem 16 33 0 0 1 0 1 1 0 8 0 scxspl 216 353758 0 353758 9 8 1 8 0 8 1 plimitpl 152 15 0 7 1 0 1 1 0 8 0 sigapl 424 53296 0 53263 4 0 4 4 0 8 0 futexpl 56 276667 0 276666 1 0 1 1 0 8 0 knotepl 112 6339 0 6319 1 0 1 1 0 8 0 kqueuepl 168 9299 0 9297 1 0 1 1 0 8 0 pipepl 336 15831 0 15820 40 38 2 3 0 8 1 fdescpl 496 53280 0 53263 3 0 3 3 0 8 0 filepl 152 214504 0 214399 48 42 6 6 0 8 1 lockfpl 104 9031 0 9030 1 0 1 1 0 8 0 lockfspl 48 2711 0 2710 1 0 1 1 0 8 0 sessionpl 144 18 0 7 1 0 1 1 0 8 0 pgrppl 48 636 0 625 1 0 1 1 0 8 0 ucredpl 96 10754 0 10745 1 0 1 1 0 8 0 zombiepl 144 53263 0 53263 1 0 1 1 0 8 1 processpl 1080 53296 0 53263 3 0 3 3 0 8 0 procpl 672 124685 0 124643 8 3 5 5 0 8 1 sockpl 480 60602 0 60582 167 161 6 7 0 8 3 mcl64k 65536 17 0 0 3 0 3 3 0 8 0 mcl16k 16384 25 0 0 4 1 3 3 0 8 0 mcl12k 12288 53 0 0 2 0 2 2 0 8 0 mcl9k 9216 50 0 0 3 1 2 2 0 8 0 mcl8k 8192 41 0 0 4 1 3 3 0 8 0 mcl4k 4096 55 0 0 6 3 3 3 0 8 0 mcl2k2 2112 12 0 0 1 0 1 1 0 8 0 mcl2k 2048 182 0 0 12 1 11 12 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 1816 0 0 18 3 15 16 0 8 0 bufpl 280 59638 0 53374 448 0 448 448 0 8 0 anonpl 24 13835791 0 13828884 88 42 46 47 0 186 0 amapchunkpl 152 1538733 0 1538336 82 65 17 17 0 158 1 amappl16 200 100215 0 100040 22 12 10 11 0 8 0 amappl15 192 66 0 58 1 0 1 1 0 8 0 amappl14 184 26897 0 26894 1 0 1 1 0 8 0 amappl13 176 26 0 25 1 0 1 1 0 8 0 amappl12 168 42 0 34 1 0 1 1 0 8 0 amappl11 160 53 0 40 1 0 1 1 0 8 0 amappl10 152 26 0 18 1 0 1 1 0 8 0 amappl9 144 26565 0 26563 1 0 1 1 0 8 0 amappl8 136 985 0 853 5 0 5 5 0 8 0 amappl7 128 26222 0 26210 1 0 1 1 0 8 0 amappl6 120 549 0 535 1 0 1 1 0 8 0 amappl5 112 26739 0 26726 1 0 1 1 0 8 0 amappl4 104 28969 0 28939 1 0 1 1 0 8 0 amappl3 96 2263 0 2259 1 0 1 1 0 8 0 amappl2 88 29076 0 29027 2 0 2 2 0 8 0 amappl1 80 897848 0 897423 14 4 10 12 0 8 0 amappl 88 646490 0 646360 4 0 4 4 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 64 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 53280 0 53263 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 53280 0 53263 1 0 1 1 0 8 0 vmmpekpl 168 286754 0 286727 2 0 2 2 0 8 0 vmmpepl 168 5965553 0 5963945 108 36 72 72 0 357 1 vmsppl 368 53279 0 53263 2 0 2 2 0 8 0 rwobjpl 56 1027973 0 1027018 32 18 14 14 0 8 0 pdppl 4096 106567 0 106526 57 16 41 45 0 8 0 pvpl 32 23254793 0 23244482 369 280 89 129 0 265 2 pmappl 232 53279 0 53263 2 1 1 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 363 0 74 10 1 9 9 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:398 witness_checkorder(fffffd806e2c03d0,9,0) at witness_checkorder+0x108b rw_enter(fffffd806e2c03c0,1) at rw_enter+0xd4 rrw_enter(fffffd806e2c03c0,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd806737aa98,2001) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd806737aa98,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 vget(fffffd806737aa98,2001) at vget+0x1f7 sys/kern/vfs_subr.c:676 ktrwriteraw(ffff800021273260,fffffd806737aa98,fffffd807f7d8a80,ffff8000222d6fd0,ffff8000222d6fb0) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff800021273260,ffffffff823bc3dc,ffff8000222d70b8,8) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff800021273260,ffffffff823bc3dc,ffff8000222d70b8,8) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_socketpair(ffff800021273260,ffff8000222d7128,ffff8000222d7170) at sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 syscall(ffff8000222d71f0) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff8000222d71f0) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x3e629819fa0, count: -12 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800020d58ff0) 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(ffffffff828bbdf0) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff828bbdf0) at __mp_lock+0x129 sys/kern/kern_lock.c:147 uvm_fault(fffffd80084daa10,83130daa000,0,1) at uvm_fault+0x1a8 sys/uvm/uvm_fault.c:623 upageflttrap(ffff8000234c10f0,83130daa000) at upageflttrap+0x82 sys/arch/amd64/amd64/trap.c:179 usertrap(ffff8000234c10f0) at usertrap+0x21a sys/arch/amd64/amd64/trap.c:401 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffe7fc0, count: -8