syzbot


uvm_fault: socreate

Status: fixed on 2022/02/26 07:36
Reported-by: syzbot+1b5b209ce506db4d411d@syzkaller.appspotmail.com
Fix commit: 532245610f13 Reported-by: syzbot+1b5b209ce506db4d411d@syzkaller.appspotmail.com Revert the pr_usrreqs move: syzkaller found a NULL pointer deref and I won't be available to monitor for followup issues for a bit
First crash: 283d, last: 282d

Sample crash report:
login: uvm_fault(0xfffffd807effe170, 0x0, 0, 1) -> e
kernel: page fault trap, code=0
Stopped at      socreate+0x84:  cmpq    $0,0(%rax)
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
  32029  22506      0         0x2          0    0  syz-executor252658238
*377589  22506      0         0x2  0x4000000    1K syz-executor252658238
socreate(18,ffff8000211c7d98,0,29) at socreate+0x84 sys/kern/uipc_socket.c:172
sys_socket(ffff8000ffff6010,ffff8000211c7e28,ffff8000211c7e80) at sys_socket+0xd8 sys/kern/uipc_syscalls.c:96
syscall(ffff8000211c7ef0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000211c7ef0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x4f18fe68210, count: 11
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports.  Insufficient info makes it difficult to find and fix bugs.
ddb{1}> 
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
*cpu1: uvm_fault(0xfffffd807effe170, 0x0, 0, 1) -> e
ddb{1}> trace
socreate(18,ffff8000211c7d98,0,29) at socreate+0x84 sys/kern/uipc_socket.c:172
sys_socket(ffff8000ffff6010,ffff8000211c7e28,ffff8000211c7e80) at sys_socket+0xd8 sys/kern/uipc_syscalls.c:96
syscall(ffff8000211c7ef0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000211c7ef0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x4f18fe68210, count: -4
ddb{1}> show registers
rdi                                0
rsi                                0
rbp               0xffff8000211c7d80
rbx                             0x18
rdx                                0
rcx                             0x29
rax                                0
r8                0xffffffff81e690f0    uvm_map_inentry_pc
r9                              0x24
r10                                0
r11               0x719e8506aa03dd4c
r12               0xffff8000211c7d98
r13               0xffffffff8288cca0    inet6sw
r14                                0
r15                             0x29
rip               0xffffffff81e82144    socreate+0x84
cs                               0x8
rflags                       0x10286    __ALIGN_SIZE+0xf286
rsp               0xffff8000211c7d20
ss                              0x10
socreate+0x84:  cmpq    $0,0(%rax)
ddb{1}> show proc
PROC (syz-executor252658238) pid=377589 stat=onproc
    flags process=2<EXEC> proc=4000000<THREAD>
    pri=32, usrpri=51, nice=20
    forw=0xffffffffffffffff, list=0xffff8000ffff6d30,0xffffffff82a987b8
    process=0xffff8000211b6150 user=0xffff8000211c2000, vmspace=0xfffffd807effe170
    estcpu=1, cpticks=1, pctcpu=0.0
    user=0, sys=1, intr=0
ddb{1}> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 22506   32029  59302      0  7         0x2                syz-executor252658238
*22506  377589  59302      0  7   0x4000002                syz-executor252658238
 59302  137927  76145      0  3    0x10008a  sigsusp       ksh
 76145  517772  18992      0  3        0x9a  kqread        sshd
 28544   78284      1      0  3    0x100083  ttyin         getty
 18992  120242      1      0  3        0x88  kqread        sshd
 19553  296776  70114     73  3   0x1100090  kqread        syslogd
 70114  328237      1      0  3    0x100082  netio         syslogd
 28187  456185      1      0  3    0x100080  kqread        resolvd
  7526  445309  64533     77  3    0x100092  kqread        dhcpleased
 49280   97087  64533     77  3    0x100092  kqread        dhcpleased
 64533  513252      1      0  3        0x80  kqread        dhcpleased
 91267   83492      0      0  3     0x14200  bored         smr
 46148  485544      0      0  3     0x14200  pgzero        zerothread
 38773  290175      0      0  3     0x14200  aiodoned      aiodoned
 44686  515594      0      0  3     0x14200  syncer        update
 67180  368950      0      0  3     0x14200  cleaner       cleaner
 90062   60054      0      0  3     0x14200  reaper        reaper
 90814  169482      0      0  3     0x14200  pgdaemon      pagedaemon
  1650  343388      0      0  3     0x14200  bored         viomb
 89419  396056      0      0  3  0x40014200  acpi0         acpi0
 45681  465408      0      0  3  0x40014200                idle1
 57007  141187      0      0  3     0x14200  bored         softnet
 21473   15080      0      0  3     0x14200  bored         systqmp
 59463  420910      0      0  3     0x14200  bored         systq
 29891  237342      0      0  3  0x40014200  bored         softclock
 56585  161711      0      0  3  0x40014200                idle0
     1   69016      0      0  3        0x82  wait          init
     0       0     -1      0  3     0x10200  scheduler     swapper
ddb{1}> show all locks
Process 22506 (syz-executor252658238) thread 0xffff8000ffff6010 (377589)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82abcc60)
#0  witness_lock+0x44d
#1  kpageflttrap+0x23d sys/arch/amd64/amd64/trap.c:274
#2  kerntrap+0xef sys/arch/amd64/amd64/trap.c:318
#3  alltraps_kern_meltdown+0x7b
#4  socreate+0x84 sys/kern/uipc_socket.c:172
#5  sys_socket+0xd8 sys/kern/uipc_syscalls.c:96
#6  syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#6  syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#7  Xsyscall+0x128
ddb{1}> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim
         devbuf 10143   6388K    6419K  78643K     11233        0
            pcb    13      8K       8K  78643K        13        0
         rtable    62      2K       2K  78643K       114        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         4        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     1      0K       0K  78643K         1        0
           proc    55     74K      75K  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    25    122K     122K  78643K        25        0
           exec     0      0K       2K  78643K       404        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    83      3K       5K  78643K      2039        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    19   4686K    4749K  78643K      3108        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       20    0       17     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     1     1     1     0     8    1
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      304       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     1415    0       38    87     0    87    87     0     8    0
ffsino     272     1415    0       38    92     0    92    92     0     8    0
nchpl      144     1590    0       47    58     0    58    58     0     8    0
uvmvnodes   80     1424    0        0    30     0    30    30     0     8    0
vnodes     224     1424    0        0    84     0    84    84     0     8    0
namei      1024    4177    0     4177     2     1     1     1     0     8    1
percpumem   16       32    0        0     1     0     1     1     0     8    0
scxspl     216     3744    0     3744     2     1     1     2     0     8    1
plimitpl   152       15    0        9     1     0     1     1     0     8    0
sigapl     424      300    0      273     4     0     4     4     0     8    0
futexpl     64        1    0        1     1     0     1     1     0     8    1
knotepl    120       51    0        0     2     0     2     2     0     8    0
kqueuepl   216       20    0       13     1     0     1     1     0     8    0
pipepl     336       82    0       79     2     1     1     1     0     8    0
fdescpl    496      286    0      273     3     0     3     3     0     8    0
filepl     152     1028    0      975     3     0     3     3     0     8    0
lockfpl    104        6    0        4     1     0     1     1     0     8    0
lockfspl    48        4    0        2     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       64    0       54     1     0     1     1     0     8    0
zombiepl   144      273    0      273     2     1     1     1     0     8    1
processpl  1064     300    0      273     3     0     3     3     0     8    0
procpl     672      301    0      273     3     0     3     3     0     8    0
sockpl     480       78    0       56     4     1     3     4     0     8    0
mcl8k      8192       4    0        0     1     0     1     1     0     8    0
mcl4k      4096       3    0        0     1     0     1     1     0     8    0
mcl2k      2048      70    0        0     9     0     9     9     0     8    0
mtagpl      96        3    0        0     1     0     1     1     0     8    0
mbufpl     256      118    0        0     8     0     8     8     0     8    0
bufpl      288     1946    0       84   133     0   133   133     0     8    0
anonpl      24    39484    0    37159    16     1    15    15     0   186    0
amapchunkpl 152    3760    0     3609     7     1     6     7     0   158    0
amappl16   200       25    0       25     1     1     0     1     0     8    0
amappl15   192       63    0       60     1     0     1     1     0     8    0
amappl13   176       32    0       31     2     1     1     1     0     8    0
amappl12   168       15    0       15     2     1     1     1     0     8    1
amappl11   160       41    0       31     1     0     1     1     0     8    0
amappl10   152        3    0        2     1     0     1     1     0     8    0
amappl9    144      449    0      447     1     0     1     1     0     8    0
amappl8    136      353    0      348     1     0     1     1     0     8    0
amappl7    128       61    0       57     1     0     1     1     0     8    0
amappl6    120      109    0       96     1     0     1     1     0     8    0
amappl5    112      177    0      169     1     0     1     1     0     8    0
amappl4    104      592    0      571     1     0     1     1     0     8    0
amappl3     96      116    0      107     1     0     1     1     0     8    0
amappl2     88      356    0      320     1     0     1     1     0     8    0
amappl1     80     8430    0     8067     9     0     9     9     0     8    0
amappl      88     1777    0     1710     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      286    0      273     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24      286    0      273     1     0     1     1     0     8    0
vmmpekpl   168     6000    0     5984     1     0     1     1     0     8    0
vmmpepl    168    25275    0    24465    43     5    38    43     0   357    0
vmsppl     368      285    0      273     2     0     2     2     0     8    0
rwobjpl     56     9232    0     7276    30     1    29    29     0     8    0
pdppl      4096     579    0      546    51    18    33    41     0     8    0
pvpl        32   127328    0   123242    40     6    34    40     0   265    0
pmappl     248      285    0      273     2     1     1     2     0     8    0
extentpl    40       58    0       38     1     0     1     1     0     8    0
phpool     112      402    0       22    11     0    11    11     0     8    0
ddb{1}> machine ddbcpu 0
Stopped at      x86_ipi_db+0x1a:        addq    $0x8,%rsp
x86_ipi_db(ffffffff828d5ff0) 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: 0x7f7ffffd8730, count: 12
ddb{0}> trace
x86_ipi_db(ffffffff828d5ff0) 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: 0x7f7ffffd8730, count: -3
ddb{0}> machine ddbcpu 1
Stopped at      socreate+0x84:  cmpq    $0,0(%rax)
socreate(18,ffff8000211c7d98,0,29) at socreate+0x84 sys/kern/uipc_socket.c:172
sys_socket(ffff8000ffff6010,ffff8000211c7e28,ffff8000211c7e80) at sys_socket+0xd8 sys/kern/uipc_syscalls.c:96
syscall(ffff8000211c7ef0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000211c7ef0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x4f18fe68210, count: 11
ddb{1}> trace
socreate(18,ffff8000211c7d98,0,29) at socreate+0x84 sys/kern/uipc_socket.c:172
sys_socket(ffff8000ffff6010,ffff8000211c7e28,ffff8000211c7e80) at sys_socket+0xd8 sys/kern/uipc_syscalls.c:96
syscall(ffff8000211c7ef0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000211c7ef0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x4f18fe68210, count: -4
ddb{1}> 

Crashes (106):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-openbsd-setuid 2022/02/26 06:30 openbsd 307d7537791b 45a13a73 .config log report syz C uvm_fault: socreate
ci-openbsd-setuid 2022/02/26 01:39 openbsd 307d7537791b 45a13a73 .config log report syz C uvm_fault: socreate
ci-openbsd-multicore 2022/02/25 22:09 openbsd 307d7537791b 45a13a73 .config log report syz C uvm_fault: socreate
ci-openbsd-setuid 2022/02/25 20:54 openbsd 307d7537791b 45a13a73 .config log report syz C uvm_fault: socreate
ci-openbsd-multicore 2022/02/25 20:49 openbsd 307d7537791b 45a13a73 .config log report syz C uvm_fault: socreate
ci-openbsd-multicore 2022/02/25 14:27 openbsd 307d7537791b 7c337266 .config log report syz C uvm_fault: socreate
ci-openbsd-setuid 2022/02/25 14:14 openbsd 307d7537791b 7c337266 .config log report syz C uvm_fault: socreate
ci-openbsd-setuid 2022/02/25 14:13 openbsd 307d7537791b 7c337266 .config log report syz C uvm_fault: socreate
ci-openbsd-multicore 2022/02/26 06:09 openbsd 307d7537791b 45a13a73 .config log report syz uvm_fault: socreate
ci-openbsd-multicore 2022/02/26 06:34 openbsd 307d7537791b 45a13a73 .config log report uvm_fault: socreate
ci-openbsd-setuid 2022/02/26 05:13 openbsd 307d7537791b 45a13a73 .config log report uvm_fault: socreate
ci-openbsd-main 2022/02/26 03:55 openbsd 307d7537791b 45a13a73 .config log report uvm_fault: socreate
ci-openbsd-multicore 2022/02/26 02:45 openbsd 307d7537791b 45a13a73 .config log report uvm_fault: socreate
ci-openbsd-setuid 2022/02/26 00:42 openbsd 307d7537791b 45a13a73 .config log report uvm_fault: socreate
ci-openbsd-multicore 2022/02/25 23:41 openbsd 307d7537791b 45a13a73 .config log report uvm_fault: socreate
ci-openbsd-setuid 2022/02/25 23:26 openbsd 307d7537791b 45a13a73 .config log report uvm_fault: socreate
ci-openbsd-multicore 2022/02/25 21:59 openbsd 307d7537791b 45a13a73 .config log report uvm_fault: socreate
ci-openbsd-setuid 2022/02/25 20:42 openbsd 307d7537791b 45a13a73 .config log report uvm_fault: socreate
ci-openbsd-setuid 2022/02/25 20:38 openbsd 307d7537791b 45a13a73 .config log report uvm_fault: socreate
ci-openbsd-setuid 2022/02/25 20:38 openbsd 307d7537791b 45a13a73 .config log report uvm_fault: socreate
ci-openbsd-main 2022/02/25 20:26 openbsd 307d7537791b 45a13a73 .config log report uvm_fault: socreate
ci-openbsd-multicore 2022/02/25 20:12 openbsd 307d7537791b 45a13a73 .config log report uvm_fault: socreate
ci-openbsd-multicore 2022/02/25 19:52 openbsd 307d7537791b 45a13a73 .config log report uvm_fault: socreate
ci-openbsd-setuid 2022/02/25 19:48 openbsd 307d7537791b 45a13a73 .config log report uvm_fault: socreate
ci-openbsd-setuid 2022/02/25 19:45 openbsd 307d7537791b 45a13a73 .config log report uvm_fault: socreate
ci-openbsd-multicore 2022/02/25 19:37 openbsd 307d7537791b 45a13a73 .config log report uvm_fault: socreate
ci-openbsd-multicore 2022/02/25 19:37 openbsd 307d7537791b 45a13a73 .config log report uvm_fault: socreate
ci-openbsd-multicore 2022/02/25 19:13 openbsd 307d7537791b 45a13a73 .config log report uvm_fault: socreate
ci-openbsd-setuid 2022/02/25 19:01 openbsd 307d7537791b 45a13a73 .config log report uvm_fault: socreate
ci-openbsd-multicore 2022/02/25 18:49 openbsd 307d7537791b 45a13a73 .config log report uvm_fault: socreate
ci-openbsd-multicore 2022/02/25 18:47 openbsd 307d7537791b 45a13a73 .config log report uvm_fault: socreate
ci-openbsd-main 2022/02/25 18:10 openbsd 307d7537791b 7c337266 .config log report uvm_fault: socreate
ci-openbsd-multicore 2022/02/25 18:01 openbsd 307d7537791b 7c337266 .config log report uvm_fault: socreate
ci-openbsd-setuid 2022/02/25 18:01 openbsd 307d7537791b 7c337266 .config log report uvm_fault: socreate
ci-openbsd-setuid 2022/02/25 17:35 openbsd 307d7537791b 7c337266 .config log report uvm_fault: socreate
ci-openbsd-main 2022/02/25 17:11 openbsd 307d7537791b 7c337266 .config log report uvm_fault: socreate
ci-openbsd-multicore 2022/02/25 17:00 openbsd 307d7537791b 7c337266 .config log report uvm_fault: socreate
ci-openbsd-multicore 2022/02/25 16:42 openbsd 307d7537791b 7c337266 .config log report uvm_fault: socreate
ci-openbsd-multicore 2022/02/25 15:52 openbsd 307d7537791b 7c337266 .config log report uvm_fault: socreate
ci-openbsd-setuid 2022/02/25 15:39 openbsd 307d7537791b 7c337266 .config log report uvm_fault: socreate
ci-openbsd-multicore 2022/02/25 15:28 openbsd 307d7537791b 7c337266 .config log report uvm_fault: socreate
ci-openbsd-setuid 2022/02/25 15:27 openbsd 307d7537791b 7c337266 .config log report uvm_fault: socreate
ci-openbsd-multicore 2022/02/25 15:22 openbsd 307d7537791b 7c337266 .config log report uvm_fault: socreate
ci-openbsd-setuid 2022/02/25 14:54 openbsd 307d7537791b 7c337266 .config log report uvm_fault: socreate
ci-openbsd-multicore 2022/02/25 14:41 openbsd 307d7537791b 7c337266 .config log report uvm_fault: socreate
ci-openbsd-main 2022/02/25 14:24 openbsd 307d7537791b 7c337266 .config log report uvm_fault: socreate
ci-openbsd-main 2022/02/25 14:24 openbsd 307d7537791b 7c337266 .config log report uvm_fault: socreate
ci-openbsd-main 2022/02/25 14:23 openbsd 307d7537791b 7c337266 .config log report uvm_fault: socreate
ci-openbsd-multicore 2022/02/25 14:21 openbsd 307d7537791b 7c337266 .config log report uvm_fault: socreate
ci-openbsd-multicore 2022/02/25 14:13 openbsd 307d7537791b 7c337266 .config log report uvm_fault: socreate
ci-openbsd-multicore 2022/02/25 14:11 openbsd 307d7537791b 7c337266 .config log report uvm_fault: socreate
ci-openbsd-setuid 2022/02/25 13:58 openbsd 307d7537791b 7c337266 .config log report uvm_fault: socreate
* Struck through repros no longer work on HEAD.