witness: lock order reversal: 1st 0xfffffd807b4d8c08 fdlock (&newfdp->fd_fd.fd_lock) 2nd 0xfffffd807b4455f8 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{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(fffffd807b4455f8,9,0) at witness_checkorder+0x108b rw_enter(fffffd807b4455e8,1) at rw_enter+0xd4 rrw_enter(fffffd807b4455e8,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd8066812c90,2001) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd8066812c90,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 vget(fffffd8066812c90,2001) at vget+0x1f7 sys/kern/vfs_subr.c:676 ktrwriteraw(ffff8000222e27e0,fffffd8066812c90,fffffd807f7d8b40,ffff800021eafc60,ffff800021eafc40) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff8000222e27e0,ffffffff823bbe8d,ffff800021eafd48,8) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff8000222e27e0,ffffffff823bbe8d,ffff800021eafd48,8) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_socketpair(ffff8000222e27e0,ffff800021eafdb8,ffff800021eafe00) at sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 syscall(ffff800021eafe80) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800021eafe80) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbe3bc9ad740, count: -12 ddb{1}> show registers rdi 0xffff800021498000 rsi 0x180f2 acpi_pdirpa+0x3f5a rbp 0xffff800021eaf870 rbx 0x3 rdx 0xffff800021498000 rcx 0x180f1 acpi_pdirpa+0x3f59 rax 0xffffffff819ce3e7 db_enter+0x17 r8 0xffffffff82256061 witness_checkorder+0x1061 r9 0x5 r10 0xdd0aee9406bb3c0c r11 0xe44398013360a1be r12 0 r13 0xfffffd807b4455f8 r14 0 r15 0xfffffd8002cf9740 rip 0xffffffff819ce3e8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021eaf860 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=162749 stat=onproc flags process=0 proc=4000001 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff8000222e2000,0xffffffff82804e60 process=0xffff8000224b61d8 user=0xffff800021eaa000, vmspace=0xfffffd8066ad3b90 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 83296 523869 20442 0 7 0x1 syz-executor.1 *83296 162749 20442 0 7 0x4000001 syz-executor.1 20442 191217 90488 0 3 0x82 nanoslp syz-executor.1 77994 223670 0 0 3 0x14280 nfsidl nfsio 8040 409325 0 0 3 0x14280 nfsidl nfsio 20507 368844 0 0 3 0x14280 nfsidl nfsio 51316 155941 0 0 3 0x14280 nfsidl nfsio 80086 115439 0 0 3 0x14280 nfsidl nfsio 90494 522551 0 0 3 0x14280 nfsidl nfsio 24548 412647 0 0 3 0x14280 nfsidl nfsio 89898 282010 0 0 3 0x14280 nfsidl nfsio 14730 92289 0 0 3 0x14280 nfsidl nfsio 96295 410140 0 0 3 0x14280 nfsidl nfsio 54669 45148 0 0 3 0x14280 nfsidl nfsio 64659 233568 0 0 3 0x14280 nfsidl nfsio 52404 457501 0 0 3 0x14280 nfsidl nfsio 94040 417352 0 0 3 0x14280 nfsidl nfsio 67763 523168 0 0 3 0x14280 nfsidl nfsio 82581 461782 0 0 3 0x14280 nfsidl nfsio 66277 510582 0 0 3 0x14280 nfsidl nfsio 43950 485281 0 0 3 0x14280 nfsidl nfsio 16603 116062 0 0 3 0x14280 nfsidl nfsio 94818 218491 0 0 3 0x14280 nfsidl nfsio 16197 250314 90488 0 2 0x2 syz-executor.0 45166 271224 0 0 3 0x14200 acct acct 26775 395494 0 0 3 0x14200 bored sosplice 90488 382877 14829 0 3 0x82 thrsleep syz-fuzzer 90488 356906 14829 0 3 0x4000082 nanoslp syz-fuzzer 90488 466032 14829 0 3 0x4000082 thrsleep syz-fuzzer 90488 232437 14829 0 3 0x4000082 thrsleep syz-fuzzer 90488 136056 14829 0 3 0x4000082 nanoslp syz-fuzzer 90488 189078 14829 0 3 0x4000082 thrsleep syz-fuzzer 90488 216041 14829 0 3 0x4000082 kqread syz-fuzzer 90488 25721 14829 0 3 0x4000082 thrsleep syz-fuzzer 14829 232864 4844 0 3 0x10008a sigsusp ksh 4844 497839 33452 0 3 0x92 select sshd 82900 169604 1 0 3 0x100083 ttyin getty 33452 156627 1 0 3 0x80 select sshd 76751 510625 61486 74 3 0x100092 bpf pflogd 61486 8990 1 0 3 0x80 netio pflogd 55418 446932 60901 73 3 0x100090 kqread syslogd 60901 234880 1 0 3 0x100082 netio syslogd 50447 359841 1 77 3 0x100090 poll dhclient 33249 488575 1 0 3 0x80 poll dhclient 13467 188896 0 0 3 0x14200 bored smr 83720 381887 0 0 2 0x14200 zerothread 36422 497211 0 0 3 0x14200 aiodoned aiodoned 15313 110928 0 0 3 0x14200 syncer update 80389 207586 0 0 3 0x14200 cleaner cleaner 39120 32834 0 0 3 0x14200 reaper reaper 42646 302542 0 0 3 0x14200 pgdaemon pagedaemon 28156 135099 0 0 3 0x14200 bored crynlk 81700 416680 0 0 3 0x14200 bored crypto 43402 370127 0 0 3 0x14200 bored viomb 12647 5337 0 0 3 0x40014200 acpi0 acpi0 80155 97234 0 0 3 0x40014200 idle1 75486 99932 0 0 2 0x14200 softnet 2143 400354 0 0 3 0x14200 bored systqmp 42384 11954 0 0 3 0x14200 bored systq 12991 274745 0 0 3 0x40014200 bored softclock 49022 341296 0 0 3 0x40014200 idle0 1 135454 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 83296 (syz-executor.1) thread 0xffff8000222e27e0 (162749) exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8282dfa0) #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 (0xfffffd807b4d8c08) #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 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10157 6570K 7728K 78643K 15769 0 pcb 13 8K 8K 78643K 176 0 rtable 105 3K 3K 78643K 672 0 ifaddr 61 13K 13K 78643K 251 0 sysctl 1 1K 1K 78643K 1 0 counters 44 34K 34K 78643K 126 0 ioctlops 0 0K 4K 78643K 1670 0 iov 0 0K 16K 78643K 103 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 1 0 vnodes 1225 77K 77K 78643K 2700 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 33 0 VM map 2 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 456 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12598 0 file desc 5 13K 25K 78643K 4154 0 sigio 0 0K 0K 78643K 5 0 proc 63 63K 95K 78643K 677 0 subproc 32 2K 2K 78643K 85 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 209 0 in_multi 33 2K 2K 78643K 212 0 ether_multi 1 0K 0K 78643K 39 0 mrt 0 0K 0K 78643K 4 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 73 334K 334K 78643K 73 0 exec 0 0K 2K 78643K 479 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 240 255K 259K 78643K 50825 0 UVM aobj 71 3K 3K 78643K 72 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 174 0 NDP 10 0K 0K 78643K 66 0 temp 123 3986K 4058K 78643K 18932 0 kqueue 3 4K 8K 78643K 119 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 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 120 134 0 132 1 0 1 1 0 8 0 rtentry 112 101 0 57 2 0 2 2 0 8 0 unpcb 120 809 0 797 1 0 1 1 0 8 0 syncache 296 63 0 63 6 5 1 1 0 8 1 tcpqe 32 36 0 36 3 3 0 1 0 8 0 tcpcb 736 654 0 633 17 15 2 5 0 8 0 arp 120 12 0 6 1 0 1 1 0 8 0 inpcb 304 1534 0 1526 3 1 2 2 0 8 1 nd6 48 23 0 17 1 0 1 1 0 8 0 pkpcb 40 17 0 17 4 4 0 1 0 8 0 kcovpl 48 5 0 3 1 0 1 1 0 8 0 ppxss 1128 30 0 30 4 4 0 1 0 8 0 pffrent 40 10 0 10 2 2 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 pfqueue 264 4 0 4 1 1 0 1 0 8 0 pfstitem 24 23 0 21 1 0 1 1 0 8 0 pfstkey 112 23 0 21 1 0 1 1 0 8 0 pfstate 320 23 0 21 2 1 1 2 0 8 0 pfrule 1360 120 0 114 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 463 0 269 14 1 13 13 0 8 0 art_table 32 464 0 269 2 0 2 2 0 8 0 art_node 16 100 0 60 1 0 1 1 0 8 0 semupl 112 9 0 9 1 1 0 1 0 8 0 semapl 112 454 0 444 1 0 1 1 0 8 0 shmpl 112 69 0 1 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 6679 0 5269 90 1 89 89 0 8 0 ffsino 272 6679 0 5269 95 0 95 95 0 8 0 nchpl 144 11698 0 10101 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 28691 0 28691 2 1 1 1 0 8 1 percpumem 16 74 0 41 1 0 1 1 0 8 0 vcpupl 1984 15 0 0 2 0 2 2 0 8 0 vmpool 560 15 0 0 2 0 2 2 0 8 0 scsiplug 72 14 0 14 2 2 0 1 0 8 0 scxspl 216 33874 0 33874 9 8 1 8 0 8 1 plimitpl 152 122 0 114 1 0 1 1 0 8 0 sigapl 424 4382 0 4328 7 0 7 7 0 8 0 futexpl 56 27819 0 27819 2 1 1 1 0 8 1 knotepl 112 224 0 204 1 0 1 1 0 8 0 kqueuepl 168 1797 0 1791 1 0 1 1 0 8 0 pipepl 336 268 0 257 7 5 2 3 0 8 0 fdescpl 496 4344 0 4328 3 0 3 3 0 8 0 filepl 152 13843 0 13739 8 3 5 7 0 8 1 lockfpl 104 486 0 485 1 0 1 1 0 8 0 lockfspl 48 212 0 211 1 0 1 1 0 8 0 sessionpl 144 21 0 10 1 0 1 1 0 8 0 pgrppl 48 30 0 19 1 0 1 1 0 8 0 ucredpl 96 1909 0 1900 1 0 1 1 0 8 0 zombiepl 144 4328 0 4328 1 0 1 1 0 8 1 processpl 1080 4382 0 4328 4 0 4 4 0 8 0 procpl 672 9258 0 9196 7 1 6 6 0 8 0 sosppl 168 60 0 60 5 5 0 1 0 8 0 sockpl 480 2495 0 2473 10 6 4 5 0 8 0 mcl64k 65536 11 0 0 2 0 2 2 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 17 0 0 2 0 2 2 0 8 0 mcl9k 9216 4 0 0 1 0 1 1 0 8 0 mcl8k 8192 17 0 0 3 0 3 3 0 8 0 mcl4k 4096 10 0 0 2 0 2 2 0 8 0 mcl2k 2048 261 0 0 16 0 16 16 0 8 0 mtagpl 96 200 0 0 5 0 5 5 0 8 0 mbufpl 256 678 0 0 38 0 38 38 0 8 0 bufpl 280 8402 0 2136 448 0 448 448 0 8 0 anonpl 24 1105525 0 1097655 100 50 50 95 0 186 1 amapchunkpl 152 120253 0 119859 21 4 17 19 0 158 0 amappl16 200 8696 0 8468 36 23 13 34 0 8 0 amappl15 192 67 0 61 1 0 1 1 0 8 0 amappl14 184 1265 0 1265 2 2 0 1 0 8 0 amappl13 176 59 0 57 1 0 1 1 0 8 0 amappl12 168 44 0 35 1 0 1 1 0 8 0 amappl11 160 2457 0 2444 1 0 1 1 0 8 0 amappl10 152 34 0 25 1 0 1 1 0 8 0 amappl9 144 719 0 717 2 1 1 1 0 8 0 amappl8 136 433 0 371 3 0 3 3 0 8 0 amappl7 128 487 0 476 1 0 1 1 0 8 0 amappl6 120 128 0 110 1 0 1 1 0 8 0 amappl5 112 4801 0 4788 1 0 1 1 0 8 0 amappl4 104 2436 0 2408 1 0 1 1 0 8 0 amappl3 96 138 0 134 1 0 1 1 0 8 0 amappl2 88 1783 0 1734 2 0 2 2 0 8 0 amappl1 80 76115 0 75692 13 3 10 12 0 8 0 amappl 88 50363 0 50225 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 71 0 1 2 0 2 2 0 8 0 uaddrrnd 24 4359 0 4328 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4359 0 4328 1 0 1 1 0 8 0 vmmpekpl 168 22956 0 22923 2 0 2 2 0 8 0 vmmpepl 168 483743 0 482236 97 26 71 89 0 357 0 vmsppl 368 4358 0 4328 3 0 3 3 0 8 0 rwobjpl 56 83813 0 82865 21 7 14 20 0 8 0 pdppl 4096 8725 0 8671 76 20 56 57 0 8 2 pvpl 32 2339057 0 2327845 213 105 108 163 0 265 6 pmappl 232 4358 0 4328 3 1 2 2 0 8 0 extentpl 40 58 0 40 1 0 1 1 0 8 0 phpool 112 375 0 46 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(ffffffff8273cff0) 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 __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x3e kd_curproc sys/dev/kcov.c:571 [inline] __sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x3e sys/dev/kcov.c:143 __mp_lock(ffffffff8282dd98) at __mp_lock+0x133 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff8282dd98) at __mp_lock+0x133 sys/kern/kern_lock.c:147 intr_handler(ffff800021eb59c0,ffff800000255d80) at intr_handler+0x5e sys/arch/amd64/amd64/intr.c:532 Xintr_ioapic_edge20_untramp() at Xintr_ioapic_edge20_untramp+0x18f __mp_lock(ffffffff8282dd98) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline] __mp_lock(ffffffff8282dd98) at __mp_lock+0x129 sys/kern/kern_lock.c:147 ktrstruct(ffff8000222e2000,ffffffff823c75df,ffff800021eb5b98,10) at ktrstruct+0xee sys_clock_gettime(ffff8000222e2000,ffff800021eb5c00,ffff800021eb5c50) at sys_clock_gettime+0xfb sys/kern/kern_time.c:171 syscall(ffff800021eb5cd0) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800021eb5cd0) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd8670, count: -12 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(fffffd807b4455f8,9,0) at witness_checkorder+0x108b rw_enter(fffffd807b4455e8,1) at rw_enter+0xd4 rrw_enter(fffffd807b4455e8,1) at rrw_enter+0x88 sys/kern/kern_rwlock.c:461 VOP_LOCK(fffffd8066812c90,2001) at VOP_LOCK+0x87 sys/kern/vfs_vops.c:614 vn_lock(fffffd8066812c90,2001) at vn_lock+0x84 sys/kern/vfs_vnops.c:579 vget(fffffd8066812c90,2001) at vget+0x1f7 sys/kern/vfs_subr.c:676 ktrwriteraw(ffff8000222e27e0,fffffd8066812c90,fffffd807f7d8b40,ffff800021eafc60,ffff800021eafc40) at ktrwriteraw+0x138 sys/kern/kern_ktrace.c:659 ktrstruct(ffff8000222e27e0,ffffffff823bbe8d,ffff800021eafd48,8) at ktrstruct+0x169 ktrwrite2 sys/kern/kern_ktrace.c:627 [inline] ktrstruct(ffff8000222e27e0,ffffffff823bbe8d,ffff800021eafd48,8) at ktrstruct+0x169 sys/kern/kern_ktrace.c:311 sys_socketpair(ffff8000222e27e0,ffff800021eafdb8,ffff800021eafe00) at sys_socketpair+0x3ed sys/kern/uipc_syscalls.c:470 syscall(ffff800021eafe80) at syscall+0x5bf mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800021eafe80) at syscall+0x5bf sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbe3bc9ad740, count: -12