kernel: protection fault trap, code=0 Stopped at lf_advlock+0x2fa: incl 0x28(%r12) ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace lf_advlock(ffff80000159bf20,0,ffff8000358074b8,8,ffff800037c194c0,40) at lf_advlock+0x2fa ls_ref sys/kern/vfs_lockf.c:138 [inline] lf_advlock(ffff80000159bf20,0,ffff8000358074b8,8,ffff800037c194c0,40) at lf_advlock+0x2fa sys/kern/vfs_lockf.c:278 VOP_ADVLOCK(fffffd806219a7c8,ffff8000358074b8,8,ffff800037c194c0,40) at VOP_ADVLOCK+0x87 sys/kern/vfs_vops.c:623 sys_fcntl(ffff8000fffef770,ffff800037c19620,ffff800037c19570) at sys_fcntl+0x13e6 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 syscall(ffff800037c19620) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800037c19620) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf6db9a19760, count: -5 ddb{0}> show registers rdi 0 rsi 0 rbp 0xffff800037c193e0 rbx 0x3 rdx 0 rcx 0xffff8000fffef770 rax 0xffffffff837d9ff0 cpu_info_full_primary+0x1ff0 r8 0xffff800037c194c0 r9 0x40 r10 0x9e3f6c25b7d12ee7 r11 0x885a5e65dee13e2a r12 0xdeaf4152deaf4152 r13 0x8 r14 0xffff800037c194c0 r15 0x7fffffffffffff01 rip 0xffffffff816f258a lf_advlock+0x2fa cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff800037c19350 ss 0x10 lf_advlock+0x2fa: incl 0x28(%r12) ddb{0}> show proc PROC (syz-executor) tid=310972 pid=47614 tcnt=4 stat=onproc flags process=10 proc=4000000 runpri=50, usrpri=50, slppri=36, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff8000fffefa08,0xffff8000fffee2c0 process=0xffff8000357fce90 user=0xffff800037c14000, vmspace=0xfffffd806cbe3028 estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 47614 238471 89975 32767 3 0x90 nanoslp syz-executor 47614 361736 89975 32767 3 0x4000090 fsleep syz-executor *47614 310972 89975 32767 7 0x4000010 syz-executor 47614 246577 89975 32767 3 0x4000010 lockflk syz-executor 14235 204790 35343 0 3 0x2 lockflk syz-executor 43541 298286 87418 32767 7 0x10 syz-executor 43541 165723 87418 32767 3 0x4000090 ttyretype syz-executor 43541 287765 87418 32767 3 0x4000090 fsleep syz-executor 67623 520862 31554 32767 3 0x90 piperd syz-executor 87418 278615 7827 32767 3 0x90 nanoslp syz-executor 17644 106379 71695 32767 3 0x90 wait syz-executor 68203 377979 77029 32767 3 0x90 wait syz-executor 89975 241179 32580 32767 3 0x90 nanoslp syz-executor 57851 255482 59624 32767 3 0x90 wait syz-executor 31554 505436 35343 0 3 0x82 wait syz-executor 7827 455743 35343 0 3 0x82 wait syz-executor 71695 315377 35343 0 3 0x82 wait syz-executor 77029 296408 35343 0 3 0x82 wait syz-executor 59624 509934 35343 0 3 0x82 wait syz-executor 32580 381758 35343 0 3 0x82 wait syz-executor 35343 417606 60144 0 3 0x82 nanoslp syz-executor 60144 520625 54525 0 3 0x10008a sigsusp ksh 54525 72264 25902 0 3 0x98 kqread sshd-session 25902 464675 15563 0 3 0x92 kqread sshd-session 25615 224241 1 0 3 0x100083 ttyin getty 15563 405459 1 0 3 0x88 kqread sshd 77154 38793 93730 73 3 0x1100090 kqread syslogd 93730 57198 1 0 3 0x100082 sbwait syslogd 80658 56375 1 0 3 0x100080 kqread resolvd 58048 19732 77048 77 3 0x100092 kqread dhcpleased 65743 128421 77048 77 3 0x100092 kqread dhcpleased 77048 449980 1 0 3 0x80 kqread dhcpleased 51603 454132 0 0 3 0x14200 bored smr 98348 15866 0 0 2 0x14200 zerothread 73855 60326 0 0 3 0x14200 aiodoned aiodoned 11572 55842 0 0 3 0x14200 syncer update 68337 348973 0 0 3 0x14200 cleaner cleaner 50821 119173 0 0 3 0x14200 reaper reaper 71855 102482 0 0 3 0x14200 pgdaemon pagedaemon 13801 125758 0 0 3 0x14200 bored viomb 11654 58966 0 0 3 0x40014200 acpi0 acpi0 72443 340033 0 0 3 0x40014200 idle1 72553 27872 0 0 3 0x14200 bored softnet1 86427 50519 0 0 3 0x14200 bored softnet0 60364 396596 0 0 3 0x14200 bored systqmp 51685 56045 0 0 3 0x14200 bored systq 19582 303348 0 0 3 0x14200 tmoslp softclockmp 72218 58929 0 0 3 0x40014200 tmoslp softclock 88202 153850 0 0 3 0x40014200 idle0 1 512596 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 47614 (syz-executor) thread 0xffff8000fffef770 (310972) exclusive rwlock lockflk r = 0 (0xffffffff837dd558) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 lf_advlock+0x227 sys/kern/vfs_lockf.c:260 #3 VOP_ADVLOCK+0x87 sys/kern/vfs_vops.c:623 #4 sys_fcntl+0x13e6 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 #5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #6 Xsyscall+0x128 Process 14235 (syz-executor) thread 0xffff8000fffeea78 (204790) exclusive rrwlock inode r = 0 (0xfffffd807c3c8498) #0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160 #1 rw_do_enter_write+0x419 sys/kern/kern_rwlock.c:320 #2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621 #3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527 #4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570 #5 vget+0x2a2 sys/kern/vfs_subr.c:686 #6 cache_lookup+0x351 sys/kern/vfs_cache.c:222 #7 ufs_lookup+0x1e3 sys/ufs/ufs/ufs_lookup.c:160 #8 VOP_LOOKUP+0x6e sys/kern/vfs_vops.c:85 #9 vfs_lookup+0x93a sys/kern/vfs_lookup.c:566 #10 namei+0x7ca sys/kern/vfs_lookup.c:250 #11 vn_open+0x15a sys/kern/vfs_vnops.c:140 #12 doopenat+0x35b sys/kern/vfs_syscalls.c:1138 #13 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] #13 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 #14 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 11049 12014K 12034K 166960K 12146 0 pcb 17 12K 12K 166960K 17 0 rtable 195 5K 7K 166960K 357 0 pf 27 16K 16K 166960K 31 0 ifaddr 34 6K 7K 166960K 44 0 ifgroup 42 1K 2K 166960K 50 0 sysctl 1 1K 9K 166960K 5 0 counters 66 36K 37K 166960K 70 0 ioctlops 0 0K 2K 166960K 31 0 iov 0 0K 8K 166960K 4 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1335 84K 84K 166960K 1586 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 3 5K 5K 166960K 4 0 VM map 2 1K 1K 166960K 2 0 sem 5 0K 0K 166960K 6 0 dirhash 12 2K 2K 166960K 18 0 ACPI 1692 195K 286K 166960K 12470 0 file desc 20 73K 125K 166960K 309 0 sigio 0 0K 0K 166960K 1 0 proc 61 115K 147K 166960K 478 0 subproc 54 3K 4K 166960K 297 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 0 0K 0K 166960K 14 0 in_multi 77 5K 7K 166960K 102 0 ether_multi 1 0K 0K 166960K 2 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 91 413K 413K 166960K 91 0 exec 0 0K 1K 166960K 395 0 fusefs mount 1 32K 32K 166960K 1 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 228 151K 200K 166960K 3941 0 UVM aobj 7 2K 2K 166960K 8 0 pinsyscall 41 82K 112K 166960K 1380 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 4 0 NDP 9 0K 2K 166960K 27 0 temp 28 8674K 8738K 166960K 4633 0 kqueue 13 20K 24K 166960K 31 0 SYN cache 2 16K 16K 166960K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 26 0 0 1 0 1 1 0 8 0 rtpcb 120 38 0 35 1 0 1 1 0 8 0 rtentry 176 112 0 23 6 0 6 6 0 8 0 unpcb 144 74 0 56 1 0 1 1 0 8 0 syncache 336 3 0 3 1 0 1 1 0 8 1 tcpcb 736 26 0 22 1 0 1 1 0 8 0 arp 136 18 0 4 1 0 1 1 0 8 0 ipq 40 1 0 1 1 0 1 1 0 8 1 ipqe 40 2 0 2 1 0 1 1 0 8 1 inpcb 328 145 0 137 4 0 4 4 0 8 3 ip6q 72 1 0 0 1 0 1 1 0 8 0 ip6af 40 1 0 0 1 0 1 1 0 8 0 nd6 152 25 0 6 1 0 1 1 0 8 0 kcovpl 48 33 0 27 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 455 0 88 29 0 29 29 0 8 3 art_table 40 456 0 88 5 0 5 5 0 8 0 art_node 32 112 0 31 1 0 1 1 0 8 0 sysvmsgpl 40 1 0 0 1 0 1 1 0 8 0 semapl 112 4 0 1 1 0 1 1 0 8 0 shmpl 112 5 0 1 1 0 1 1 0 8 0 dirhash 1024 21 0 4 3 0 3 3 0 8 0 dino2pl 256 1682 0 143 97 0 97 97 0 8 0 ffsino 296 1682 0 143 119 0 119 119 0 8 0 nchpl 144 1958 0 242 64 0 64 64 0 8 0 vnodes 216 1989 0 0 111 0 111 111 0 8 0 namei 1024 6111 0 6111 1 0 1 1 0 8 1 percpumem 16 50 0 2 1 0 1 1 0 8 0 kstatmem 264 24 0 4 2 0 2 2 0 8 0 scxspl 216 6527 0 6527 3 2 1 2 1 8 1 plimitpl 152 97 0 75 2 0 2 2 0 8 1 sigapl 424 547 0 499 7 0 7 7 0 8 1 knotepl 120 310 0 0 10 0 10 10 0 8 0 kqueuepl 224 37 0 27 1 0 1 1 0 8 0 pipepl 344 197 0 170 3 0 3 3 0 8 0 fdescpl 528 531 0 499 4 0 4 4 0 8 0 filepl 160 2251 0 2048 11 0 11 11 0 8 1 lockfpl 104 76 0 74 1 0 1 1 0 8 0 lockfspl 48 16 0 14 1 0 1 1 0 8 0 sessionpl 144 46 0 32 1 0 1 1 0 8 0 pgrppl 48 80 0 59 1 0 1 1 0 8 0 ucredpl 104 234 0 217 1 0 1 1 0 8 0 zombiepl 144 502 0 499 1 0 1 1 0 8 0 processpl 1232 547 0 499 5 0 5 5 0 8 0 procpl 664 672 0 619 6 0 6 6 0 8 0 sockpl 752 259 0 230 6 0 6 6 0 8 2 mcl64k 65536 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 137 0 0 18 0 18 18 0 8 0 mcl2k 2048 26 0 0 4 0 4 4 0 8 0 mtagpl 96 1 0 0 1 0 1 1 0 8 0 mbufpl 256 239 0 0 15 0 15 15 0 8 0 bufpl 280 2424 0 119 165 0 165 165 0 8 0 anonpl 32 7071 0 0 57 0 57 57 0 246 0 amapchunkpl 152 11519 0 11060 31 0 31 31 0 158 9 amappl16 200 2005 0 1988 11 2 9 9 0 8 7 amappl15 192 3 0 3 1 1 0 1 0 8 0 amappl14 184 4 0 4 1 1 0 1 0 8 0 amappl13 176 408 0 407 1 0 1 1 0 8 0 amappl12 168 879 0 838 3 0 3 3 0 8 0 amappl11 160 8 0 8 1 1 0 1 0 8 0 amappl10 152 42 0 31 1 0 1 1 0 8 0 amappl9 144 250 0 250 1 1 0 1 0 8 0 amappl8 136 22 0 20 1 0 1 1 0 8 0 amappl7 128 74 0 73 1 0 1 1 0 8 0 amappl6 120 262 0 251 1 0 1 1 0 8 0 amappl5 112 74 0 67 1 0 1 1 0 8 0 amappl4 104 382 0 359 1 0 1 1 0 8 0 amappl3 96 1719 0 1636 3 0 3 3 0 8 0 amappl2 88 638 0 566 2 0 2 2 0 8 0 amappl1 80 9288 0 8753 14 0 14 14 0 8 1 amappl 88 3208 0 3049 5 0 5 5 0 92 0 uvmvnodes 80 97 0 0 2 0 2 2 0 8 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 7 0 1 1 0 1 1 0 8 0 uaddrrnd 24 531 0 499 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 531 0 499 1 0 1 1 0 8 0 vmmpekpl 168 6429 0 6391 3 0 3 3 0 8 0 vmmpepl 168 41221 0 39405 93 0 93 93 0 357 6 vmsppl 488 530 0 499 7 1 6 6 0 8 0 rwobjpl 80 14285 0 13399 22 0 22 22 0 8 1 pdppl 4096 1070 0 998 116 40 76 98 0 8 4 pvpl 32 12725 0 0 103 0 103 103 0 265 0 pmappl 256 530 0 499 4 1 3 3 0 8 0 extentpl 40 45 0 27 1 0 1 1 0 8 0 phpool 112 295 0 43 8 0 8 8 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace lf_advlock(ffff80000159bf20,0,ffff8000358074b8,8,ffff800037c194c0,40) at lf_advlock+0x2fa ls_ref sys/kern/vfs_lockf.c:138 [inline] lf_advlock(ffff80000159bf20,0,ffff8000358074b8,8,ffff800037c194c0,40) at lf_advlock+0x2fa sys/kern/vfs_lockf.c:278 VOP_ADVLOCK(fffffd806219a7c8,ffff8000358074b8,8,ffff800037c194c0,40) at VOP_ADVLOCK+0x87 sys/kern/vfs_vops.c:623 sys_fcntl(ffff8000fffef770,ffff800037c19620,ffff800037c19570) at sys_fcntl+0x13e6 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:-1 syscall(ffff800037c19620) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline] syscall(ffff800037c19620) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:775 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xf6db9a19760, count: -5 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff8000299ddff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 end of kernel end trace frame: 0x7e101897af50, count: -3