syzbot


uvm_fault: wsmux_do_ioctl (3)

Status: closed as dup on 2019/02/10 09:16
Reported-by: syzbot+40deffd84d57c3555766@syzkaller.appspotmail.com
First crash: 1984d, last: 1976d
Duplicate of
Title Repro Cause bisect Fix bisect Count Last Reported
uvm_fault: wsmux_detach_sc syz 10 1977d 1989d
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
openbsd uvm_fault: wsmux_do_ioctl (4) C 3 1885d 1909d 3/3 fixed on 2019/05/22 04:45
openbsd uvm_fault: wsmux_do_ioctl 2 2067d 2105d 3/3 fixed on 2018/12/18 19:33
openbsd uvm_fault: wsmux_do_ioctl (2) C 17 1993d 1997d 3/3 fixed on 2019/02/01 17:26

Sample crash report:
login: uvm_fault(0xfffffd806e9755a8, 0x9f, 0, 2) -> e
kernel: page fault trap, code=0
Stopped at      wsmux_do_ioctl+0x8c0:   movq    %rcx,0(%rax)
ddb{0}> 
ddb{0}> set $lines = 0
ddb{0}> show panic
kernel page fault
uvm_fault(0xfffffd806e9755a8, 0x9f, 0, 2) -> e
wsmux_do_ioctl(ffff800000026d00,80085762,ffff800020bd3460,82,ffff800020b24e18) at wsmux_do_ioctl+0x8c0 wsmux_detach_sc sys/dev/wscons/wsmux.c:696 [inline]
wsmux_do_ioctl(ffff800000026d00,80085762,ffff800020bd3460,82,ffff800020b24e18) at wsmux_do_ioctl+0x8c0 sys/dev/wscons/wsmux.c:438
end trace frame: 0xffff800020bd3310, count: 0
ddb{0}> trace
wsmux_do_ioctl(ffff800000026d00,80085762,ffff800020bd3460,82,ffff800020b24e18) at wsmux_do_ioctl+0x8c0 wsmux_detach_sc sys/dev/wscons/wsmux.c:696 [inline]
wsmux_do_ioctl(ffff800000026d00,80085762,ffff800020bd3460,82,ffff800020b24e18) at wsmux_do_ioctl+0x8c0 sys/dev/wscons/wsmux.c:438
VOP_IOCTL(fffffd806dc80710,80085762,ffff800020bd3460,82,fffffd807f7c7d20,ffff800020b24e18) at VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290
vn_ioctl(fffffd806fcad8e8,80085762,ffff800020bd3460,ffff800020b24e18) at vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512
sys_ioctl(ffff800020b24e18,ffff800020bd35a8,ffff800020bd3590) at sys_ioctl+0x646
syscall(ffff800020bd3640) at syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline]
syscall(ffff800020bd3640) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574
Xsyscall(6,0,5e098d7e0c8,0,5e098d7e0a8,5e098d7e0a0) at Xsyscall+0x128
end of kernel
end trace frame: 0x5e33b6894d0, count: -6
ddb{0}> show registers
rdi                                0
rsi                                0
rbp               0xffff800020bd3260
rbx               0xffff800000026db8
rdx               0xffffffff81f7106c    cy_pio_rec+0x1f720
rcx               0xffffffffffffffff
rax                             0x9f
r8                                 0
r9                                 0
r10               0xffff800020bc6f30
r11               0xe63cd31056fa6a2f
r12               0xffff80000064dc00
r13                              0x1
r14               0xffffffff8215ac18    wsmouse_srcops
r15                                0
rip               0xffffffff810eb9b0    wsmux_do_ioctl+0x8c0
cs                               0x8
rflags                       0x10286    __ALIGN_SIZE+0xf286
rsp               0xffff800020bd31e0
ss                              0x10
wsmux_do_ioctl+0x8c0:   movq    %rcx,0(%rax)
ddb{0}> show proc
PROC (syz-executor1711) pid=494600 stat=onproc
    flags process=0 proc=4000000<THREAD>
    pri=0, usrpri=50, nice=20
    forw=0xffffffffffffffff, list=0xffff800020b25070,0xffff800020b244c8
    process=0xffff800020b7b710 user=0xffff800020bce000, vmspace=0xfffffd806e9755a8
    estcpu=10, cpticks=0, pctcpu=0.0
    user=0, sys=0, intr=0
ddb{0}> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 12206  119486  52040      0  2           0                syz-executor1711
*12206  494600  52040      0  7   0x4000000                syz-executor1711
 92464  428390  27978      0  2           0                syz-executor1711
 92464   57200  27978      0  7   0x4000000                syz-executor1711
 92464  231975  27978      0  3   0x4000080  fsleep        syz-executor1711
 52040  305521  88034      0  3        0x80  nanosleep     syz-executor1711
 27978  301694  88034      0  3        0x80  nanosleep     syz-executor1711
 88034    4391  87220      0  3        0x82  nanosleep     syz-executor1711
 87220  264480  76864      0  3    0x10008a  pause         ksh
 76864  126320    930      0  3        0x92  select        sshd
 35767  508318      1      0  3    0x100083  ttyin         getty
   930  188034      1      0  3        0x80  select        sshd
 44830  195838  45399     73  2    0x100090                syslogd
 45399  369862      1      0  3    0x100082  netio         syslogd
 44930  174105      1     77  3    0x100090  poll          dhclient
 17281   46976      1      0  3        0x80  poll          dhclient
 60511  338714      0      0  2     0x14200                zerothread
 29634  138532      0      0  3     0x14200  aiodoned      aiodoned
 24116  338829      0      0  3     0x14200  syncer        update
 57975  472386      0      0  3     0x14200  cleaner       cleaner
 26226  113940      0      0  3     0x14200  reaper        reaper
 82938   61333      0      0  3     0x14200  pgdaemon      pagedaemon
 38300  396304      0      0  3     0x14200  bored         crynlk
 85918  155232      0      0  3     0x14200  bored         crypto
 12586    5021      0      0  3  0x40014200  acpi0         acpi0
 34501   96372      0      0  3  0x40014200                idle1
 41178  297444      0      0  3     0x14200  bored         softnet
 23596  299014      0      0  3     0x14200  bored         systqmp
 81782  317157      0      0  3     0x14200  bored         systq
 33495  379035      0      0  3  0x40014200  bored         softclock
 65022   81193      0      0  3  0x40014200                idle0
     1   48844      0      0  3        0x82  wait          init
     0       0     -1      0  3     0x10200  scheduler     swapper
ddb{0}> show all locks
Process 12206 (syz-executor1711) thread 0xffff800020b24e18 (494600)
exclusive kernel_lock &kernel_lock r = 1 (0xffffffff82348720) locked @ /syzkaller/managers/multicore/kernel/sys/arch/amd64/amd64/trap.c:161
#0  witness_lock+0x58a sys/kern/subr_witness.c:1205
#1  ___mp_acquire_count+0x67 sys/kern/kern_lock.c:231
#2  mi_switch+0x3b0 sys/kern/sched_bsd.c:436
#3  sleep_finish+0x110 sys/kern/kern_synch.c:312
#4  sleep_finish_all+0x34 sleep_finish_timeout sys/kern/kern_synch.c:336 [inline]
#4  sleep_finish_all+0x34 sys/kern/kern_synch.c:157
#5  tsleep+0x1bc
#6  pckbc_enqueue_cmd+0x29d sys/dev/ic/pckbc.c:923
#7  pms_change_state+0x1d3 sys/dev/pckbc/pms.c:839
#8  pms_disable+0x39 sys/dev/pckbc/pms.c:874
#9  wsmouse_mux_close+0x3f sys/dev/wscons/wsmouse.c:571
#10 wsmux_do_ioctl+0x853 wsmux_detach_sc sys/dev/wscons/wsmux.c:693 [inline]
#10 wsmux_do_ioctl+0x853 sys/dev/wscons/wsmux.c:438
#11 VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290
#12 vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512
#13 sys_ioctl+0x646
#14 syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline]
#14 syscall+0x5ac sys/arch/amd64/amd64/trap.c:574
#15 Xsyscall+0x128
ddb{0}> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim Kern Lim
         devbuf  9443   6323K    6323K  78643K     10642        0        0
            pcb    23      9K       9K  78643K        55        0        0
         rtable    61      2K       2K  78643K       115        0        0
         ifaddr    21      7K       7K  78643K        21        0        0
       counters    39     33K      33K  78643K        39        0        0
       ioctlops     0      0K       2K  78643K        13        0        0
          mount     1      1K       1K  78643K         1        0        0
         vnodes  1166     73K      73K  78643K      1172        0        0
      UFS quota     1     32K      32K  78643K         1        0        0
      UFS mount     5     36K      36K  78643K         5        0        0
            shm     2      1K       1K  78643K         2        0        0
         VM map     2      1K       1K  78643K         2        0        0
            sem     2      0K       0K  78643K         2        0        0
        dirhash    12      2K       2K  78643K        12        0        0
           ACPI  1792    194K     288K  78643K     12592        0        0
      file desc     1      0K       0K  78643K         1        0        0
           proc    40     38K      46K  78643K       207        0        0
    NFS srvsock     1      0K       0K  78643K         1        0        0
     NFS daemon     1     16K      16K  78643K         1        0        0
       in_multi    11      0K       0K  78643K        11        0        0
    ether_multi     1      0K       0K  78643K         1        0        0
    ISOFS mount     1     32K      32K  78643K         1        0        0
  MSDOSFS mount     1     16K      16K  78643K         1        0        0
           ttys    18     79K      79K  78643K        18        0        0
           exec     0      0K       1K  78643K       149        0        0
        pagedep     1      8K       8K  78643K         1        0        0
       inodedep     1     32K      32K  78643K         1        0        0
         newblk     1      0K       0K  78643K         1        0        0
        VM swap     7     26K      26K  78643K         7        0        0
       UVM amap    56      3K       3K  78643K      1149        0        0
       UVM aobj     2      2K       2K  78643K         2        0        0
        memdesc     1      4K       4K  78643K         1        0        0
    crypto data     1      1K       1K  78643K         1        0        0
            NDP     3      0K       0K  78643K         3        0        0
           temp    30   2347K    2411K  78643K      1688        0        0
      SYN cache     2     16K      16K  78643K         2        0        0
ddb{0}> show all pools
Name      Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
arp         64        2    0        0     1     0     1     1     0     8    0
inpcbpl    280       22    0       16     1     0     1     1     0     8    0
plimitpl   152       13    0        8     1     0     1     1     0     8    0
plcache    128       20    0        0     1     0     1     1     0     8    0
rtentry    112       23    0        1     1     0     1     1     0     8    0
syncache   264        5    0        5     2     1     1     1     0     8    1
tcpcb      544        8    0        5     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
dino1pl    128     1383    0       18    45     0    45    45     0     8    0
ffsino     272     1383    0       18    92     0    92    92     0     8    0
nchpl      144     1555    0       30    57     0    57    57     0     8    0
uvmvnodes   72     1392    0        0    26     0    26    26     0     8    0
vnodes     200     1392    0        0    74     0    74    74     0     8    0
namei      1024    3993    0     3993     3     2     1     1     0     8    1
percpumem   16       30    0        0     1     0     1     1     0     8    0
scxspl     192     2366    0     2366    11    10     1     6     0     8    1
sigapl     432      298    0      284     2     0     2     2     0     8    0
futexpl     56      490    0      489     1     0     1     1     0     8    0
knotepl    112        5    0        0     1     0     1     1     0     8    0
kqueuepl   104        1    0        0     1     0     1     1     0     8    0
pipepl     112      114    0      107     3     2     1     1     0     8    0
fdescpl    488      299    0      284     2     0     2     2     0     8    0
filepl     152     1297    0     1251     2     0     2     2     0     8    0
lockfpl    104      493    0      490     2     1     1     1     0     8    0
lockfspl    32      116    0      115     2     1     1     1     0     8    0
sessionpl  112       17    0        9     1     0     1     1     0     8    0
pgrppl      48       17    0        9     1     0     1     1     0     8    0
ucredpl     96       47    0       40     1     0     1     1     0     8    0
zombiepl   144      284    0      284     3     2     1     1     0     8    1
processpl  840      313    0      284     4     0     4     4     0     8    0
procpl     600      558    0      526     3     0     3     3     0     8    0
sockpl     384       64    0       48     2     0     2     2     0     8    0
mcl4k      4096       2    0        0     1     0     1     1     0     8    0
mcl2k      2048      64    0        0     8     0     8     8     0     8    0
mtagpl      80        1    0        0     1     0     1     1     0     8    0
mbufpl     256       89    0        0     5     0     5     5     0     8    0
bufpl      256     2010    0      254   110     0   110   110     0     8    0
anonpl      16    22962    0    21783     7     2     5     6     0   125    0
amapchunkpl 152    1120    0     1075     2     0     2     2     0   158    0
amappl16   192      197    0      191     1     0     1     1     0     8    0
amappl15   184        1    0        1     1     1     0     1     0     8    0
amappl14   176        1    0        1     1     1     0     1     0     8    0
amappl13   168       16    0       13     1     0     1     1     0     8    0
amappl12   160        7    0        7     2     2     0     1     0     8    0
amappl11   152      172    0      163     1     0     1     1     0     8    0
amappl10   144       43    0       43     3     2     1     1     0     8    1
amappl9    136      200    0      198     1     0     1     1     0     8    0
amappl8    128      227    0      216     1     0     1     1     0     8    0
amappl7    120       30    0       25     1     0     1     1     0     8    0
amappl6    112       40    0       36     1     0     1     1     0     8    0
amappl5    104      167    0      157     1     0     1     1     0     8    0
amappl4     96      257    0      240     1     0     1     1     0     8    0
amappl3     88      114    0      107     1     0     1     1     0     8    0
amappl2     80     1670    0     1618     2     0     2     2     0     8    0
amappl1     72    14234    0    13805    15     5    10    15     0     8    0
amappl      72      741    0      715     1     0     1     1     0    75    0
dma4096    4096       1    0        1     1     1     0     1     0     8    0
dma256     256        6    0        6     1     1     0     1     0     8    0
dma64       64      259    0      259     1     1     0     1     0     8    0
dma32       32        7    0        7     1     1     0     1     0     8    0
dma16       16       17    0       17     1     1     0     1     0     8    0
aobjpl      64        1    0        0     1     0     1     1     0     8    0
uaddrrnd    24      299    0      284     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24      299    0      284     1     0     1     1     0     8    0
vmmpekpl   168     5975    0     5955     2     0     2     2     0     8    0
vmmpepl    168    32206    0    31357    52    14    38    43     0   357    1
vmsppl     360      298    0      284     2     0     2     2     0     8    0
pdppl      4096     605    0      568     5     0     5     5     0     8    0
pvpl        32    81468    0    78569    35     9    26    26     0   265    1
pmappl     224      298    0      284     1     0     1     1     0     8    0
extentpl    40       39    0       25     1     0     1     1     0     8    0
phpool     112      237    0        4     7     0     7     7     0     8    0

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/02/09 23:56 openbsd 4071f8002cf2 d75f7686 .config console log report syz C ci-openbsd-multicore
2019/02/17 22:45 openbsd 3748d6328b3c 3e98cc30 .config console log report ci-openbsd-multicore
* Struck through repros no longer work on HEAD.