witness: lock order reversal: 1st 0xfffffd806c6f79d0 vmmaplk (&map->lock) 2nd 0xfffffd806be20a30 inode (&ip->i_lock) lock order [1] vmmaplk (&map->lock) -> [2] inode (&ip->i_lock) #0 rw_enter+0x122 #1 rrw_enter+0xbe sys/kern/kern_rwlock.c:464 #2 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 #3 vn_lock+0xa4 sys/kern/vfs_vnops.c:564 #4 vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 #5 vndstrategy+0x4ff sys/dev/vnd.c:342 #6 physio+0x2f6 sys/kern/kern_physio.c:162 #7 spec_write+0x120 sys/kern/spec_vnops.c:302 #8 VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 #9 vn_write+0x1d1 sys/kern/vfs_vnops.c:408 #10 dofilewritev+0x23c sys/kern/sys_generic.c:380 #11 sys_writev+0xd8 sys/kern/sys_generic.c:327 #12 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #12 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #13 Xsyscall+0x128 lock order [2] inode (&ip->i_lock) -> [1] vmmaplk (&map->lock) #0 rw_enter_read+0xab sys/kern/kern_rwlock.c:112 #1 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1819 #2 uvm_fault_check+0x49 sys/uvm/uvm_fault.c:672 #3 uvm_fault+0xf5 sys/uvm/uvm_fault.c:600 #4 kpageflttrap+0x2d0 sys/arch/amd64/amd64/trap.c:279 #5 kerntrap+0x14a sys/arch/amd64/amd64/trap.c:332 #6 alltraps_kern_meltdown+0x7b #7 copyout+0x57 #8 ffs_read+0x422 sys/ufs/ffs/ffs_vnops.c:254 #9 VOP_READ+0x102 sys/kern/vfs_vops.c:227 #10 vn_rdwr+0x15b #11 vmcmd_map_readvn+0x142 sys/kern/exec_subr.c:249 #12 exec_process_vmcmds+0xfb sys/kern/exec_subr.c:139 #13 sys_execve+0xbe4 sys/kern/kern_exec.c:468 #14 start_init+0x3c6 sys/kern/init_main.c:714 #15 proc_trampoline+0x10 Stopped at db_enter+0x25: 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+0x25 sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(fffffd806be20a30,9,0) at witness_checkorder+0x1047 rw_enter(fffffd806be20a20,1) at rw_enter+0x122 rrw_enter(fffffd806be20a20,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd806be55978,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd806be55978,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(1,fffffd806be55978,ffff800011a26340,69,0,1,aa9c0c8925c5fa51,0,ffff800000b3e000,1) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd805e4da128) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff8131d350,2902,0,ffffffff818b3880,ffff8000371cad00) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_write(ffff8000371caae0) at spec_write+0x120 sys/kern/spec_vnops.c:302 VOP_WRITE(fffffd8070d68eb8,ffff8000371cad00,1,fffffd807f7d3000) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_write(fffffd806bfeb908,ffff8000371cad00,0) at vn_write+0x1d1 sys/kern/vfs_vnops.c:408 dofilewritev(ffff800033585470,5,ffff8000371cad00,0,ffff8000371cadc0) at dofilewritev+0x23c sys/kern/sys_generic.c:380 sys_writev(ffff800033585470,ffff8000371cae70,ffff8000371cadc0) at sys_writev+0xd8 sys/kern/sys_generic.c:327 syscall(ffff8000371cae70) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff8000371cae70) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5fc74a0a1a0, count: -16 ddb{0}> show registers rdi 0 rsi 0x40000 acpi_pdirpa+0x2be71 rbp 0xffff8000371ca5a0 rbx 0xfffffd80042c83d8 rdx 0xffff80000128f6c0 rcx 0xffff800033585470 rax 0x3ffff acpi_pdirpa+0x2be70 r8 0xffff8000371ca480 r9 0x8080808080808080 r10 0x103b8cd7a25dd6c9 r11 0xc92676899c4545d5 r12 0 r13 0xfffffd8003adfe00 r14 0x3 r15 0xffffffff rip 0xffffffff817a0ea5 db_enter+0x25 cs 0x8 rflags 0x246 rsp 0xffff8000371ca590 ss 0x10 db_enter+0x25: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor) tid=352972 pid=44844 tcnt=2 stat=onproc flags process=0 proc=4000000 runpri=32, usrpri=50, slppri=32, nice=20 wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0 forw=0xffffffffffffffff, list=0xffff800033584540,0xffffffff8352e778 process=0xffff8000fffecdb8 user=0xffff8000371c5000, vmspace=0xfffffd806c6f78d8 estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 44844 46982 90487 0 3 0x80 fsleep syz-executor *44844 352972 90487 0 7 0x4000000 syz-executor 15896 163324 83612 0 3 0x80 fsleep syz-executor 15896 480648 83612 0 3 0x4000080 sbwait syz-executor 52266 249793 73771 0 3 0x80 fsleep syz-executor 52266 465268 73771 0 7 0x4000080 syz-executor 10246 404894 86365 0 3 0x80 fsleep syz-executor 10246 138762 86365 0 3 0x4000080 pipewr syz-executor 23151 412513 71721 0 3 0x80 fsleep syz-executor 23151 381145 71721 0 3 0x4000080 msgwait syz-executor 16139 356830 87584 0 3 0x80 fsleep syz-executor 16139 105123 87584 0 3 0x4000080 netcon syz-executor 94421 522718 0 0 3 0x14200 bored sosplice 55297 303598 1 0 3 0x100083 ttyin getty 71721 92255 87371 0 3 0x82 nanoslp syz-executor 49942 518343 87371 0 3 0x82 nanoslp syz-executor 87584 372185 87371 0 3 0x82 nanoslp syz-executor 83612 94306 87371 0 3 0x82 nanoslp syz-executor 9905 89480 87371 0 3 0x82 wait syz-executor 73771 67971 87371 0 3 0x82 nanoslp syz-executor 90487 313340 87371 0 3 0x82 nanoslp syz-executor 86365 413922 87371 0 3 0x82 nanoslp syz-executor 87371 212993 89030 0 3 0x82 kqread syz-executor 89030 259007 11122 0 3 0x10008a sigsusp ksh 11122 1603 35742 0 3 0x98 kqread sshd-session 35742 180751 68259 0 3 0x92 kqread sshd-session 68259 349781 1 0 3 0x88 kqread sshd 43143 486392 12995 74 3 0x1100092 bpf pflogd 12995 77831 1 0 3 0x80 sbwait pflogd 41553 219934 63576 73 3 0x1100090 kqread syslogd 63576 301842 1 0 3 0x100082 sbwait syslogd 17734 244273 1 0 3 0x100080 kqread resolvd 51919 194043 47451 77 3 0x100092 kqread dhcpleased 26717 471853 47451 77 3 0x100092 kqread dhcpleased 47451 107796 1 0 3 0x80 kqread dhcpleased 62174 417261 0 0 3 0x14200 bored smr 88165 278783 0 0 3 0x14200 pgzero zerothread 76431 190792 0 0 3 0x14200 aiodoned aiodoned 57614 218713 0 0 3 0x14200 syncer update 99242 223488 0 0 3 0x14200 cleaner cleaner 78708 34512 0 0 3 0x14200 reaper reaper 40058 126837 0 0 3 0x14200 pgdaemon pagedaemon 68287 89446 0 0 3 0x14200 bored viomb 93654 251289 0 0 3 0x40014200 acpi0 acpi0 70805 300693 0 0 3 0x40014200 idle1 83450 506068 0 0 3 0x14200 bored softnet3 69510 17651 0 0 3 0x14200 bored softnet2 92561 311583 0 0 3 0x14200 bored softnet1 90092 413279 0 0 3 0x14200 bored softnet0 32730 410279 0 0 3 0x14200 bored systqmp 8676 450514 0 0 3 0x14200 bored systq 55927 156908 0 0 3 0x14200 tmoslp softclockmp 70667 506916 0 0 2 0x40014200 softclock 78613 398499 0 0 3 0x40014200 idle0 1 341715 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 44844 (syz-executor) thread 0xffff800033585470 (352972) shared rwlock vmmaplk r = 0 (0xfffffd806c6f79d0) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 uvm_vslock_device+0x149 sys/uvm/uvm_glue.c:172 #2 physio+0x277 sys/kern/kern_physio.c:139 #3 spec_write+0x120 sys/kern/spec_vnops.c:302 #4 VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 #5 vn_write+0x1d1 sys/kern/vfs_vnops.c:408 #6 dofilewritev+0x23c sys/kern/sys_generic.c:380 #7 sys_writev+0xd8 sys/kern/sys_generic.c:327 #8 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #8 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #9 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8363b0f8) #0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline] #0 witness_lock+0x5bb sys/kern/subr_witness.c:1155 #1 vn_write+0x4e sys/kern/vfs_vnops.c:393 #2 dofilewritev+0x23c sys/kern/sys_generic.c:380 #3 sys_writev+0xd8 sys/kern/sys_generic.c:327 #4 syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] #4 syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 #5 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10208 11256K 11382K 166960K 11786 0 pcb 17 12K 12K 166960K 81 0 rtable 243 7K 7K 166960K 399 0 pf 36 18K 25K 166960K 75 0 ifaddr 43 7K 8K 166960K 60 0 ifgroup 55 2K 2K 166960K 88 0 sysctl 2 0K 0K 166960K 2 0 counters 64 36K 37K 166960K 84 0 ioctlops 0 0K 4K 166960K 1559 0 iov 0 0K 16K 166960K 24 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1359 85K 86K 166960K 1707 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 9K 166960K 13 0 VM map 2 1K 1K 166960K 2 0 sem 12 0K 0K 166960K 50 0 dirhash 12 2K 2K 166960K 39 0 ACPI 1690 195K 286K 166960K 12468 0 file desc 18 65K 89K 166960K 472 0 sigio 0 0K 0K 166960K 7 0 proc 72 91K 128K 166960K 579 0 subproc 104 6K 6K 166960K 104 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 2 0K 0K 166960K 162 0 in_multi 99 7K 7K 166960K 110 0 ether_multi 1 0K 0K 166960K 3 0 mrt 1 0K 0K 166960K 4 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 97 440K 440K 166960K 97 0 exec 0 0K 1K 166960K 400 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 241 73K 87K 166960K 6089 0 UVM aobj 22 3K 3K 166960K 22 0 pinsyscall 43 86K 102K 166960K 1590 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 ip6_options 0 0K 0K 166960K 32 0 NDP 12 0K 2K 166960K 38 0 temp 45 6819K 7075K 166960K 12124 0 kqueue 14 22K 26K 166960K 60 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 24 0 0 1 0 1 1 0 8 0 rtpcb 120 63 0 60 1 0 1 1 0 8 0 rtentry 112 121 0 8 4 0 4 4 0 8 0 unpcb 144 258 0 241 4 1 3 4 0 8 2 syncache 336 4 0 4 1 1 0 1 0 8 0 tcpcb 808 130 0 125 4 0 4 4 0 8 3 arp 120 19 0 0 1 0 1 1 0 8 0 inpcb 336 512 0 499 7 2 5 7 0 8 3 nd6 136 29 0 1 1 0 1 1 0 8 0 pkpcb 40 1 0 1 1 0 1 1 0 8 1 kcovpl 48 8 0 0 1 0 1 1 0 8 0 ppxss 1168 5 0 5 1 0 1 1 0 8 1 pfstscr 40 1 0 1 1 0 1 1 0 8 1 pffrag 232 4 0 0 1 0 1 1 0 482 0 pffrnode 88 4 0 0 1 0 1 1 0 8 0 pffrent 40 5 0 1 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 51 0 1 1 0 1 1 0 8 0 pfstkey 128 53 0 3 2 0 2 2 0 8 0 pfstate 376 52 0 2 6 0 6 6 0 8 0 pfrule 1344 21 0 15 2 0 2 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 536 0 42 33 0 33 33 0 8 1 art_table 32 538 0 42 5 0 5 5 0 8 0 art_node 16 119 0 17 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 6 1 0 1 1 0 8 0 semapl 112 48 0 38 1 0 1 1 0 8 0 shmpl 112 19 0 0 1 0 1 1 0 8 0 dirhash 1024 35 0 18 3 0 3 3 0 8 0 dino2pl 256 2311 0 811 95 0 95 95 0 8 0 ffsino 272 2311 0 811 101 0 101 101 0 8 0 nchpl 144 2977 0 1292 63 0 63 63 0 8 0 uvmvnodes 80 2541 0 0 52 0 52 52 0 8 0 vnodes 216 2541 0 0 142 0 142 142 0 8 0 namei 1024 9756 0 9756 1 0 1 1 0 8 1 percpumem 16 56 0 10 1 0 1 1 0 8 0 kstatmem 264 44 0 20 3 1 2 3 0 8 0 scxspl 216 10525 0 10525 5 2 3 3 1 8 3 plimitpl 152 68 0 50 1 0 1 1 0 8 0 sigapl 424 785 0 734 8 2 6 7 0 8 0 futexpl 64 6183 0 6177 1 0 1 1 0 8 0 knotepl 120 302 0 0 10 0 10 10 0 8 0 kqueuepl 216 90 0 80 1 0 1 1 0 8 0 pipepl 320 135 0 107 3 0 3 3 0 8 0 fdescpl 496 766 0 734 5 0 5 5 0 8 0 filepl 152 4019 0 3763 13 1 12 13 0 8 1 lockfpl 104 110 0 107 1 0 1 1 0 8 0 lockfspl 48 48 0 45 1 0 1 1 0 8 0 sessionpl 144 24 0 15 1 0 1 1 0 8 0 pgrppl 48 37 0 20 1 0 1 1 0 8 0 ucredpl 104 766 0 751 1 0 1 1 0 8 0 zombiepl 144 736 0 734 1 0 1 1 0 8 0 processpl 1160 785 0 734 5 1 4 5 0 8 0 procpl 648 1343 0 1286 7 1 6 6 0 8 0 sosppl 168 3 0 3 1 0 1 1 0 8 1 sockpl 664 838 0 805 8 1 7 8 0 8 3 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 141 0 0 18 0 18 18 0 8 0 mcl2k 2048 18 0 0 3 0 3 3 0 8 0 mtagpl 96 12 0 0 1 0 1 1 0 8 0 mbufpl 256 180 0 0 11 0 11 11 0 8 0 bufpl 280 3916 0 100 273 0 273 273 0 8 0 anonpl 24 173961 0 170451 60 1 59 60 0 185 23 amapchunkpl 152 19599 0 19080 28 0 28 28 0 158 7 amappl16 200 4581 0 4550 21 6 15 19 0 8 10 amappl15 192 10 0 10 1 1 0 1 0 8 0 amappl14 184 137 0 125 1 0 1 1 0 8 0 amappl13 176 14 0 13 1 0 1 1 0 8 0 amappl12 168 1468 0 1436 3 1 2 2 0 8 0 amappl11 160 57 0 43 1 0 1 1 0 8 0 amappl10 152 8 0 8 2 2 0 1 0 8 0 amappl9 144 134 0 134 1 1 0 1 0 8 0 amappl8 136 56 0 54 1 0 1 1 0 8 0 amappl7 128 109 0 97 1 0 1 1 0 8 0 amappl6 120 174 0 173 1 0 1 1 0 8 0 amappl5 112 139 0 127 1 0 1 1 0 8 0 amappl4 104 349 0 331 1 0 1 1 0 8 0 amappl3 96 3713 0 3612 3 0 3 3 0 8 0 amappl2 88 1046 0 959 3 1 2 3 0 8 0 amappl1 80 8991 0 8419 15 1 14 15 0 8 0 amappl 88 5669 0 5490 5 0 5 5 0 92 0 dma32768 32768 2 0 2 1 0 1 1 0 8 1 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma2048 2048 1 0 1 1 1 0 1 0 8 0 dma1024 1024 2 0 1 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 254 0 254 2 1 1 1 0 8 1 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 19 0 18 1 0 1 1 0 8 0 aobjpl 72 21 0 0 1 0 1 1 0 8 0 uaddrrnd 24 766 0 734 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 766 0 734 1 0 1 1 0 8 0 vmmpekpl 168 7434 0 7401 2 0 2 2 0 8 0 vmmpepl 168 55463 0 53542 97 1 96 97 0 357 8 vmsppl 448 765 0 734 6 2 4 5 0 8 0 rwobjpl 56 21698 0 18195 53 0 53 53 0 8 3 pdppl 4096 1539 0 1468 95 24 71 83 0 8 0 pvpl 32 16745 0 0 137 1 136 136 0 265 0 pmappl 248 765 0 734 3 0 3 3 0 8 0 extentpl 40 55 0 38 1 0 1 1 0 8 0 phpool 112 389 0 32 11 0 11 11 0 8 0 ddb{0}> machine ddbcpu 0 Invalid cpu 0 ddb{0}> trace db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437 witness_checkorder(fffffd806be20a30,9,0) at witness_checkorder+0x1047 rw_enter(fffffd806be20a20,1) at rw_enter+0x122 rrw_enter(fffffd806be20a20,1) at rrw_enter+0xbe sys/kern/kern_rwlock.c:464 VOP_LOCK(fffffd806be55978,2001) at VOP_LOCK+0xa6 sys/kern/vfs_vops.c:524 vn_lock(fffffd806be55978,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:564 vn_rdwr(1,fffffd806be55978,ffff800011a26340,69,0,1,aa9c0c8925c5fa51,0,ffff800000b3e000,1) at vn_rdwr+0xd1 sys/kern/vfs_vnops.c:320 vndstrategy(fffffd805e4da128) at vndstrategy+0x4ff sys/dev/vnd.c:342 physio(ffffffff8131d350,2902,0,ffffffff818b3880,ffff8000371cad00) at physio+0x2f6 sys/kern/kern_physio.c:162 spec_write(ffff8000371caae0) at spec_write+0x120 sys/kern/spec_vnops.c:302 VOP_WRITE(fffffd8070d68eb8,ffff8000371cad00,1,fffffd807f7d3000) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_write(fffffd806bfeb908,ffff8000371cad00,0) at vn_write+0x1d1 sys/kern/vfs_vnops.c:408 dofilewritev(ffff800033585470,5,ffff8000371cad00,0,ffff8000371cadc0) at dofilewritev+0x23c sys/kern/sys_generic.c:380 sys_writev(ffff800033585470,ffff8000371cae70,ffff8000371cadc0) at sys_writev+0xd8 sys/kern/sys_generic.c:327 syscall(ffff8000371cae70) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff8000371cae70) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5fc74a0a1a0, count: -16 ddb{0}> machine ddbcpu 1 Stopped at x86_ipi_db+0x27: addq $0x8,%rsp ddb{1}> trace x86_ipi_db(ffff800029b7bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27 __mp_lock(ffffffff8363aef0) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline] __mp_lock(ffffffff8363aef0) at __mp_lock+0x192 sys/kern/kern_lock.c:144 __mp_acquire_count(ffffffff8363aef0,1) at __mp_acquire_count+0x58 mi_switch() at mi_switch+0x4b7 sys/kern/sched_bsd.c:441 sleep_finish(0,1) at sleep_finish+0x2f2 sys/kern/kern_synch.c:425 pcppi_bell(ffff800000b0d400,7b,1b6,1) at pcppi_bell+0x531 sys/dev/isa/pcppi.c:240 playtone(b,4,0) at playtone+0x1e9 sys/dev/isa/spkr.c:203 spkrwrite(1b00,ffff800035399f48,1) at spkrwrite+0x9ee playstring sys/dev/isa/spkr.c:290 [inline] spkrwrite(1b00,ffff800035399f48,1) at spkrwrite+0x9ee sys/dev/isa/spkr.c:436 spec_write(ffff800035399da0) at spec_write+0x120 sys/kern/spec_vnops.c:302 VOP_WRITE(fffffd806e045498,ffff800035399f48,1,fffffd807f7d3000) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245 vn_write(fffffd806bfeb318,ffff800035399f48,1) at vn_write+0x246 sys/kern/vfs_vnops.c:408 dofilewritev(ffff8000ffff7970,5,ffff800035399f48,1,ffff80003539a000) at dofilewritev+0x23c sys/kern/sys_generic.c:380 sys_pwrite(ffff8000ffff7970,ffff80003539a0b0,ffff80003539a000) at sys_pwrite+0xae sys/kern/vfs_syscalls.c:3353 syscall(ffff80003539a0b0) at syscall+0xbb6 mi_syscall sys/sys/syscall_mi.h:178 [inline] syscall(ffff80003539a0b0) at syscall+0xbb6 sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xee3ce5e800, count: -17