kernel: protection fault trap, code=0 Stopped at lf_findoverlap+0xfb: movq 0x18(%r15),%rax ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic the kernel did not panic ddb{1}> trace lf_findoverlap(fffffd806f12b6e8,fffffd806f12ba28,2,ffff800021240470) at lf_findoverlap+0xfb sys/kern/vfs_lockf.c:659 lf_deadlock(fffffd806f12ba28) at lf_deadlock+0x1f6 lf_getblock sys/kern/vfs_lockf.c:622 [inline] lf_deadlock(fffffd806f12ba28) at lf_deadlock+0x1f6 sys/kern/vfs_lockf.c:841 lf_setlock(fffffd806f12ba28) at lf_setlock+0x168 sys/kern/vfs_lockf.c:359 lf_advlock(ffff800000bb7c20,0,fffffd806d8ac3e8,8,ffff8000212406c0,50) at lf_advlock+0x3a7 sys/kern/vfs_lockf.c:301 VOP_ADVLOCK(fffffd806e57a948,fffffd806d8ac3e8,8,ffff8000212406c0,50) at VOP_ADVLOCK+0x71 sys/kern/vfs_vops.c:628 sys_fcntl(ffff8000211a2fc8,ffff800021240748,ffff8000212407a0) at sys_fcntl+0xad9 syscall(ffff800021240810) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800021240810) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbf3dbb3f6e0, count: -8 ddb{1}> show registers rdi 0x1 rsi 0xdeaf4152deaf4152 rbp 0xffff800021240460 rbx 0xdeaf4152deaf4152 rdx 0x2 rcx 0xfffffd806f12ba28 rax 0xdeaf4152deaf4152 r8 0xffff8000212406c0 r9 0x50 r10 0x9b41b2fc8c57cff1 r11 0xbd3e2e9c34f4ccc5 r12 0 r13 0x1 r14 0xffff800021240470 r15 0xdeaf4152deaf4152 rip 0xffffffff812d943b lf_findoverlap+0xfb cs 0x8 rflags 0x10202 __ALIGN_SIZE+0xf202 rsp 0xffff8000212403e0 ss 0x10 lf_findoverlap+0xfb: movq 0x18(%r15),%rax ddb{1}> show proc PROC (syz-executor4206730405) pid=331913 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=78, nice=20 forw=0xffffffffffffffff, list=0xffff8000211a2548,0xffff8000211a3518 process=0xffff8000ffff0440 user=0xffff80002123b000, vmspace=0xfffffd806d04f010 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 7505 64982 51824 0 7 0 syz-executor4206730405 * 7505 331913 51824 0 7 0x4000000 syz-executor4206730405 69639 306162 73055 0 2 0 syz-executor4206730405 69639 228693 73055 0 2 0x4000000 syz-executor4206730405 11667 282347 17641 0 2 0 syz-executor4206730405 11667 361185 17641 0 3 0x4000080 fsleep syz-executor4206730405 70626 308236 2651 0 2 0 syz-executor4206730405 70626 165466 2651 0 3 0x4000080 lockf syz-executor4206730405 16334 111007 35273 0 2 0 syz-executor4206730405 16334 92089 35273 0 3 0x4000080 fsleep syz-executor4206730405 57464 84064 1986 0 2 0 syz-executor4206730405 57464 17307 1986 0 3 0x4000080 fsleep syz-executor4206730405 46624 372582 6739 0 3 0x80 nanoslp syz-executor4206730405 46624 188396 6739 0 3 0x4000080 lockf syz-executor4206730405 46624 453918 6739 0 3 0x4000080 fsleep syz-executor4206730405 6739 88584 76010 0 2 0 syz-executor4206730405 1986 164593 76010 0 3 0x80 nanoslp syz-executor4206730405 51824 305959 76010 0 3 0x80 nanoslp syz-executor4206730405 17641 146736 76010 0 3 0x80 nanoslp syz-executor4206730405 35273 183525 76010 0 3 0x80 nanoslp syz-executor4206730405 73055 382545 76010 0 2 0 syz-executor4206730405 2651 267937 76010 0 3 0x80 nanoslp syz-executor4206730405 29060 318136 76010 0 2 0 syz-executor4206730405 76010 80982 42029 0 3 0x82 nanoslp syz-executor4206730405 42029 157703 99721 0 3 0x10008a sigsusp ksh 99721 302909 42242 0 3 0x9a kqread sshd 28651 181035 1 0 3 0x100083 ttyin getty 42242 333045 1 0 3 0x88 kqread sshd 68765 45830 19793 73 3 0x1100090 kqread syslogd 19793 232760 1 0 3 0x100082 netio syslogd 57501 443796 1 0 3 0x100080 kqread resolvd 98510 11291 50463 77 3 0x100092 kqread dhcpleased 5913 448816 50463 77 3 0x100092 kqread dhcpleased 50463 157137 1 0 3 0x80 kqread dhcpleased 90325 456473 0 0 3 0x14200 bored smr 57703 495689 0 0 2 0x14200 zerothread 29754 291937 0 0 3 0x14200 aiodoned aiodoned 35726 204254 0 0 3 0x14200 syncer update 23855 509986 0 0 3 0x14200 cleaner cleaner 13840 36644 0 0 3 0x14200 reaper reaper 14497 370506 0 0 3 0x14200 pgdaemon pagedaemon 66801 337104 0 0 3 0x14200 bored viomb 32529 440157 0 0 3 0x40014200 acpi0 acpi0 36550 363439 0 0 3 0x40014200 idle1 73106 389552 0 0 3 0x14200 bored softnet 91313 264749 0 0 3 0x14200 bored systqmp 61720 421402 0 0 3 0x14200 bored systq 68293 130312 0 0 3 0x40014200 bored softclock 9407 196709 0 0 3 0x40014200 idle0 1 494704 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 7505 (syz-executor4206730405) thread 0xffff8000211a2fc8 (331913) exclusive rwlock lockflk r = 0 (0xffffffff82910aa0) #0 witness_lock+0x44d #1 lf_advlock+0x189 sys/kern/vfs_lockf.c:263 #2 VOP_ADVLOCK+0x71 sys/kern/vfs_vops.c:628 #3 sys_fcntl+0xad9 #4 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] #4 syscall+0x489 sys/arch/amd64/amd64/trap.c:585 #5 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10151 6389K 6419K 78643K 11241 0 pcb 13 8K 8K 78643K 13 0 rtable 62 2K 2K 78643K 108 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 5 0 vnodes 1166 73K 73K 78643K 1179 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 7 12K 17K 78643K 14209 0 proc 55 78K 79K 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 73 334K 334K 78643K 73 0 exec 0 0K 2K 78643K 391 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 92 5K 5K 78643K 24560 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 18 4705K 4769K 78643K 2270 0 kqueue 11 16K 18K 78643K 24 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 22 0 0 1 0 1 1 0 8 0 rtpcb 120 17 0 14 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 136 33 0 20 1 0 1 1 0 8 0 syncache 296 5 0 5 2 2 0 1 0 8 0 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 312 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 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 1416 0 38 87 0 87 87 0 8 0 ffsino 272 1416 0 38 92 0 92 92 0 8 0 nchpl 144 1603 0 47 58 0 58 58 0 8 0 uvmvnodes 80 1425 0 0 30 0 30 30 0 8 0 vnodes 224 1425 0 0 84 0 84 84 0 8 0 namei 1024 23119 0 23119 2 1 1 1 0 8 1 percpumem 16 32 0 0 1 0 1 1 0 8 0 scxspl 216 3989 0 3989 17 16 1 8 0 8 1 plimitpl 152 15 0 9 1 0 1 1 0 8 0 sigapl 424 5037 0 4994 5 0 5 5 0 8 0 futexpl 64 14770 0 14766 1 0 1 1 0 8 0 knotepl 120 48 0 0 2 0 2 2 0 8 0 kqueuepl 216 20 0 13 1 0 1 1 0 8 0 pipepl 336 79 0 76 2 1 1 1 0 8 0 fdescpl 496 5023 0 4995 5 1 4 4 0 8 0 filepl 152 15251 0 15186 3 0 3 3 0 8 0 lockfpl 104 14114 0 14104 1 0 1 1 0 8 0 lockfspl 48 4693 0 4688 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 14272 0 14262 1 0 1 1 0 8 0 zombiepl 144 4995 0 4994 2 1 1 1 0 8 0 processpl 1064 5037 0 4994 4 1 3 3 0 8 0 procpl 672 9885 0 9834 5 0 5 5 0 8 0 sockpl 480 75 0 53 3 0 3 3 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 70 0 0 7 0 7 7 0 8 0 mtagpl 96 2 0 0 1 0 1 1 0 8 0 mbufpl 256 114 0 0 7 0 7 7 0 8 0 bufpl 288 1943 0 87 133 0 133 133 0 8 0 anonpl 24 736637 0 733806 24 5 19 20 0 186 0 amapchunkpl 152 52270 0 52103 10 2 8 8 0 158 1 amappl16 200 4817 0 4810 1 0 1 1 0 8 0 amappl13 176 32 0 31 2 1 1 1 0 8 0 amappl12 168 4 0 3 1 0 1 1 0 8 0 amappl11 160 61 0 47 1 0 1 1 0 8 0 amappl10 152 1 0 1 1 1 0 1 0 8 0 amappl9 144 493 0 491 1 0 1 1 0 8 0 amappl8 136 5080 0 5063 2 1 1 1 0 8 0 amappl7 128 51 0 48 1 0 1 1 0 8 0 amappl6 120 92 0 82 1 0 1 1 0 8 0 amappl5 112 82 0 74 1 0 1 1 0 8 0 amappl4 104 567 0 547 1 0 1 1 0 8 0 amappl3 96 9187 0 9154 1 0 1 1 0 8 0 amappl2 88 5155 0 5109 2 0 2 2 0 8 0 amappl1 80 98254 0 97727 14 2 12 12 0 8 0 amappl 88 19571 0 19501 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 5023 0 4995 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 5023 0 4995 1 0 1 1 0 8 0 vmmpekpl 168 30626 0 30611 2 0 2 2 0 8 0 vmmpepl 168 342152 0 340786 69 5 64 64 0 357 4 vmsppl 368 5022 0 4995 3 0 3 3 0 8 0 rwobjpl 56 106852 0 104761 30 0 30 30 0 8 0 pdppl 4096 10053 0 9990 83 18 65 65 0 8 2 pvpl 32 1054446 0 1049322 52 8 44 45 0 265 0 pmappl 248 5022 0 4995 3 1 2 2 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 433 0 22 12 0 12 12 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp ddb{0}> trace x86_ipi_db(ffffffff82986ff0) 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 end of kernel end trace frame: 0x7f7ffffc9180, count: -3 ddb{0}> machine ddbcpu 1 Stopped at lf_findoverlap+0xfb: movq 0x18(%r15),%rax ddb{1}> trace lf_findoverlap(fffffd806f12b6e8,fffffd806f12ba28,2,ffff800021240470) at lf_findoverlap+0xfb sys/kern/vfs_lockf.c:659 lf_deadlock(fffffd806f12ba28) at lf_deadlock+0x1f6 lf_getblock sys/kern/vfs_lockf.c:622 [inline] lf_deadlock(fffffd806f12ba28) at lf_deadlock+0x1f6 sys/kern/vfs_lockf.c:841 lf_setlock(fffffd806f12ba28) at lf_setlock+0x168 sys/kern/vfs_lockf.c:359 lf_advlock(ffff800000bb7c20,0,fffffd806d8ac3e8,8,ffff8000212406c0,50) at lf_advlock+0x3a7 sys/kern/vfs_lockf.c:301 VOP_ADVLOCK(fffffd806e57a948,fffffd806d8ac3e8,8,ffff8000212406c0,50) at VOP_ADVLOCK+0x71 sys/kern/vfs_vops.c:628 sys_fcntl(ffff8000211a2fc8,ffff800021240748,ffff8000212407a0) at sys_fcntl+0xad9 syscall(ffff800021240810) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline] syscall(ffff800021240810) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xbf3dbb3f6e0, count: -8