syzbot


uvm_fault: memset

Status: upstream: reported C repro on 2021/08/08 04:46
Reported-by: syzbot+aed2c23886430a6eaedb@syzkaller.appspotmail.com
First crash: 982d, last: 14d
Last patch testing requests (10)
Created Duration User Patch Repo Result
2024/04/16 01:04 0m retest repro openbsd error OK
2024/04/02 00:19 15m retest repro openbsd report log
2024/04/02 00:19 22m retest repro openbsd error OK
2024/01/08 21:36 9m retest repro openbsd error OK
2024/01/08 21:36 9m retest repro openbsd error OK
2023/10/30 21:13 8m retest repro openbsd error OK
2023/10/30 21:13 9m retest repro openbsd error OK
2023/08/21 20:51 9m retest repro openbsd error OK
2023/08/21 20:51 9m retest repro openbsd error OK
2023/05/23 16:43 9m retest repro openbsd error OK

Sample crash report:
uvm_fault(0xffffffff82e86fb0, 0xffff80001c862000, 0, 2) -> d
kernel: page fault trap, code=2
Stopped at      memset+0x52:    repe stosq      %es:(%rdi)
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
*365957  54393      0           0          0    0  syz-executor121655267
memset() at memset+0x52
VOP_WRITE(fffffd806d6da008,ffff80002a68b7b0,5,fffffd807f7d78f0) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
vn_write(fffffd806f97d690,ffff80002a68b7b0,1) at vn_write+0x1a0 sys/kern/vfs_vnops.c:408
dofilewritev(ffff80002a5f7558,3,ffff80002a68b7b0,1,ffff80002a68b870) at dofilewritev+0x1a0 sys/kern/sys_generic.c:375
sys_pwritev(ffff80002a5f7558,ffff80002a68b920,ffff80002a68b870) at sys_pwritev+0xb6 sys/kern/vfs_syscalls.c:3352
syscall(ffff80002a68b920) at syscall+0x751 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7d8ea6d887d0, count: 8
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> 
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
*cpu0: uvm_fault(0xffffffff82e86fb0, 0xffff80001c862000, 0, 2) -> d
ddb> trace
memset() at memset+0x52
VOP_WRITE(fffffd806d6da008,ffff80002a68b7b0,5,fffffd807f7d78f0) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
vn_write(fffffd806f97d690,ffff80002a68b7b0,1) at vn_write+0x1a0 sys/kern/vfs_vnops.c:408
dofilewritev(ffff80002a5f7558,3,ffff80002a68b7b0,1,ffff80002a68b870) at dofilewritev+0x1a0 sys/kern/sys_generic.c:375
sys_pwritev(ffff80002a5f7558,ffff80002a68b920,ffff80002a68b870) at sys_pwritev+0xb6 sys/kern/vfs_syscalls.c:3352
syscall(ffff80002a68b920) at syscall+0x751 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7d8ea6d887d0, count: -7
ddb> show registers
rdi               0xffff80001c862000
rsi                                0
rbp               0xffff80002a68b580
rbx                              0xe
rdx                                0
rcx                            0x800
rax                                0
r8                            0x4000    __ALIGN_SIZE+0x3000
r9                0xffff80002a68b4f8
r10                0x5a499870ce4eed5
r11               0xffff80001c862000
r12                           0x4000    __ALIGN_SIZE+0x3000
r13                           0x4000    __ALIGN_SIZE+0x3000
r14               0xffff80001c862000
r15                           0x4000    __ALIGN_SIZE+0x3000
rip               0xffffffff811e0032    memset+0x52
cs                               0x8
rflags                       0x10206    __ALIGN_SIZE+0xf206
rsp               0xffff80002a68b4b8
ss                              0x10
memset+0x52:    repe stosq      %es:(%rdi)
ddb> show proc
PROC (syz-executor121655267) tid=365957 pid=54393 tcnt=1 stat=onproc
    flags process=0 proc=0
    runpri=32, usrpri=51, slppri=32, nice=20
    wchan=0x0, wmesg=, ps_single=0x0
    forw=0xffffffffffffffff, list=0xffff80002a5f62c0,0xffff80002a5f6d70
    process=0xffff80002a603ab8 user=0xffff80002a686000, vmspace=0xfffffd806d3719b0
    estcpu=1, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0
ddb> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 24146  407532  12941      0  2           0                syz-executor121655267
  4342  404944  97765      0  2           0                syz-executor121655267
 39702  381700  39039      0  2           0                syz-executor121655267
 75804   85728  12947      0  2           0                syz-executor121655267
 16741  262755   5155      0  2           0                syz-executor121655267
*54393  365957   4816      0  7           0                syz-executor121655267
 92851  429543  39930      0  2        0x80                syz-executor121655267
  7258  408804  58342      0  2           0                syz-executor121655267
 39930  468160  25315      0  2       0x480                syz-executor121655267
 12941  236357  25315      0  2       0x480                syz-executor121655267
 39039  124797  25315      0  2       0x480                syz-executor121655267
 12947   76338  25315      0  2       0x480                syz-executor121655267
  5155  397553  25315      0  2       0x480                syz-executor121655267
 97765  518388  25315      0  2       0x480                syz-executor121655267
  4816  276905  25315      0  2       0x480                syz-executor121655267
 58342  253635  25315      0  2       0x480                syz-executor121655267
 25315  282748  92512      0  3        0x82  nanoslp       syz-executor121655267
 92512  285573  19003      0  3    0x10008a  sigsusp       ksh
 19003  304151   6922      0  3        0x9a  kqread        sshd
 96559   51111      1      0  3    0x100083  ttyin         getty
  6922  467035      1      0  3        0x88  kqread        sshd
 12968  315655  93933     73  2   0x1100010                syslogd
 93933   47088      1      0  3    0x100082  netio         syslogd
 61909  298144      1      0  3    0x100080  kqread        resolvd
 87575  522683  84825     77  3    0x100092  kqread        dhcpleased
 51482  524267  84825     77  3    0x100092  kqread        dhcpleased
 84825  446059      1      0  3        0x80  kqread        dhcpleased
 79596  368776      0      0  3     0x14200  bored         smr
 79996  487569      0      0  2     0x14200                zerothread
 24142  330469      0      0  3     0x14200  aiodoned      aiodoned
 45677   69759      0      0  3     0x14200  syncer        update
  2148  437357      0      0  3     0x14200  cleaner       cleaner
  6284  376218      0      0  3     0x14200  reaper        reaper
  2552  292838      0      0  3     0x14200  pgdaemon      pagedaemon
 37587  302027      0      0  3     0x14200  bored         viomb
 23865    7012      0      0  3  0x40014200  acpi0         acpi0
 85646  198265      0      0  3     0x14200  bored         softnet3
 90650  127883      0      0  3     0x14200  bored         softnet2
 60692  473758      0      0  3     0x14200  bored         softnet1
 51939  359195      0      0  2     0x14200                softnet0
 39771  324456      0      0  3     0x14200  bored         systqmp
 70512  399103      0      0  3     0x14200  bored         systq
 56886  374886      0      0  3  0x40014200  tmoslp        softclock
 18589  488195      0      0  3  0x40014200                idle0
     1  376423      0      0  3        0x82  wait          init
     0       0     -1      0  3     0x10200  scheduler     swapper
ddb> show all locks
No such command
ddb> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim
         devbuf 10138   6382K    6413K 166960K     11216        0
            pcb    15     10K      10K 166960K        15        0
         rtable    58      1K       2K 166960K       110        0
             pf    12      6K       6K 166960K        12        0
         ifaddr    11      5K       5K 166960K        11        0
        ifgroup    17      1K       1K 166960K        17        0
       counters    22     16K      16K 166960K        22        0
       ioctlops     0      0K       2K 166960K        21        0
          mount     1      1K       1K 166960K         1        0
            log     0      0K       0K 166960K         4        0
         vnodes  1174     73K      74K 166960K      1188        0
      UFS quota     1     32K      32K 166960K         1        0
      UFS mount     5     36K      36K 166960K         5        0
            shm     2      1K       1K 166960K         2        0
         VM map     2      1K       1K 166960K         2        0
            sem     2      0K       0K 166960K         2        0
        dirhash    12      2K       2K 166960K        12        0
           ACPI  1697    195K     286K 166960K     12548        0
      file desc     1      0K       0K 166960K         1        0
           proc    55     58K      59K 166960K       246        0
    NFS srvsock     1      0K       0K 166960K         1        0
     NFS daemon     1     16K      16K 166960K         1        0
       in_multi    11      0K       0K 166960K        11        0
    ether_multi     1      0K       0K 166960K         1        0
    ISOFS mount     1     32K      32K 166960K         1        0
  MSDOSFS mount     1     16K      16K 166960K         1        0
           ttys    25    122K     122K 166960K        25        0
           exec     0      0K       1K 166960K       243        0
            tdb     3      0K       0K 166960K         3        0
        VM swap     8     62K      64K 166960K        10        0
       UVM amap   101      6K       6K 166960K      2190        0
       UVM aobj     3      2K       2K 166960K         3        0
        memdesc     1      4K       4K 166960K         1        0
    crypto data     1      1K       1K 166960K         1        0
            NDP     3      0K       0K 166960K         3        0
           temp     1   6748K    6812K 166960K      2780        0
         kqueue    11     16K      18K 166960K        24        0
      SYN cache     2     16K      16K 166960K         2        0
ddb> show all pools
Name      Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
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      144       33    0       20     1     0     1     1     0     8    0
syncache   336        5    0        5     1     0     1     1     0     8    1
tcpqe       32      134    0      134     1     0     1     1     0     8    1
tcpcb      808        8    0        5     1     0     1     1     0     8    0
arp         88        2    0        0     1     0     1     1     0     8    0
inpcb      360       26    0       20     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     1423    0       37    87     0    87    87     0     8    0
ffsino     240     1423    0       37    82     0    82    82     0     8    0
nchpl      144     1607    0       47    58     0    58    58     0     8    0
uvmvnodes   80     1433    0        0    30     0    30    30     0     8    0
vnodes     216     1433    0        0    80     0    80    80     0     8    0
namei      1024    4281    0     4277     2     0     2     2     0     8    1
kstatmem   264        6    0        0     1     0     1     1     0     8    0
scxspl     216     5790    0     5790     3     0     3     3     1     8    3
plimitpl   152       16    0       10     1     0     1     1     0     8    0
sigapl     424      330    0      285     6     0     6     6     0     8    0
knotepl    120     3612    0     3583     2     0     2     2     0     8    1
kqueuepl   184       20    0       13     1     0     1     1     0     8    0
pipepl     288       87    0       84     1     0     1     1     0     8    0
fdescpl    432      314    0      285     4     0     4     4     0     8    0
filepl     120     1148    0     1085     2     0     2     2     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    104       68    0       57     1     0     1     1     0     8    0
zombiepl   144      285    0      285     1     0     1     1     0     8    1
processpl  1072     330    0      285     4     0     4     4     0     8    0
procpl     680      330    0      285     4     0     4     4     0     8    0
sockpl     488       79    0       57     3     0     3     3     0     8    0
mcl8k      8192       4    0        4     1     0     1     1     0     8    1
mcl4k      4096      10    0       10     1     0     1     1     0     8    1
mcl2k      2048   12115    0    12075    28    15    13    28     0     8    7
mtagpl      96        4    0        4     1     0     1     1     0     8    1
mbufpl     256    19489    0    19444    15     3    12    15     0     8    7
bufpl      280     2885    0       87   200     0   200   200     0     8    0
anonpl      24   177466    0   175127    24     0    24    24     0   188    6
amapchunkpl 152    8174    0     8027     7     0     7     7     0   158    1
amappl16   200     5237    0     5199     5     0     5     5     0     8    1
amappl15   192        6    0        6     1     0     1     1     0     8    1
amappl14   184      105    0       96     1     0     1     1     0     8    0
amappl13   176        8    0        7     1     0     1     1     0     8    0
amappl12   168      792    0      780     1     0     1     1     0     8    0
amappl11   160       60    0       50     1     0     1     1     0     8    0
amappl10   152       16    0       16     1     0     1     1     0     8    1
amappl9    144      101    0      101     1     0     1     1     0     8    1
amappl8    136       69    0       67     1     0     1     1     0     8    0
amappl7    128       93    0       82     1     0     1     1     0     8    0
amappl6    120      133    0      128     1     0     1     1     0     8    0
amappl5    112       96    0       88     1     0     1     1     0     8    0
amappl4    104      333    0      307     1     0     1     1     0     8    0
amappl3     96     2441    0     2411     1     0     1     1     0     8    0
amappl2     88      647    0      595     2     0     2     2     0     8    0
amappl1     80     8901    0     8462    11     0    11    11     0     8    1
amappl      88     1919    0     1856     2     0     2     2     0    92    0
dma4096    4096       1    0        1     1     0     1     1     0     8    1
dma1024    1024       1    0        0     1     0     1     1     0     8    0
dma256     256        6    0        6     1     0     1     1     0     8    1
dma128     128      253    0      253     1     0     1     1     0     8    1
dma64       64        6    0        6     1     0     1     1     0     8    1
dma32       32        7    0        7     1     0     1     1     0     8    1
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      314    0      285     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24      314    0      285     1     0     1     1     0     8    0
vmmpekpl   168     6845    0     6826     1     0     1     1     0     8    0
vmmpepl    168    34826    0    33641    54     0    54    54     0   357    1
vmsppl     352      313    0      285     3     0     3     3     0     8    0
rwobjpl     24    18801    0    16716    14     0    14    14     0     8    1
pdppl      4096     634    0      570    78    14    64    64     0     8    0
pvpl        32   272208    0   267316    52     0    52    52     0   265   10
pmappl     216      313    0      285     2     0     2     2     0     8    0
extentpl    40       56    0       38     1     0     1     1     0     8    0
phpool     112      314    0       32     9     0     9     9     0     8    0
ddb> machine ddbcpu 0
No such command
ddb> trace
memset() at memset+0x52
VOP_WRITE(fffffd806d6da008,ffff80002a68b7b0,5,fffffd807f7d78f0) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
vn_write(fffffd806f97d690,ffff80002a68b7b0,1) at vn_write+0x1a0 sys/kern/vfs_vnops.c:408
dofilewritev(ffff80002a5f7558,3,ffff80002a68b7b0,1,ffff80002a68b870) at dofilewritev+0x1a0 sys/kern/sys_generic.c:375
sys_pwritev(ffff80002a5f7558,ffff80002a68b920,ffff80002a68b870) at sys_pwritev+0xb6 sys/kern/vfs_syscalls.c:3352
syscall(ffff80002a68b920) at syscall+0x751 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7d8ea6d887d0, count: -7
ddb> machine ddbcpu 1
No such command
ddb> trace
memset() at memset+0x52
VOP_WRITE(fffffd806d6da008,ffff80002a68b7b0,5,fffffd807f7d78f0) at VOP_WRITE+0xc3 sys/kern/vfs_vops.c:245
vn_write(fffffd806f97d690,ffff80002a68b7b0,1) at vn_write+0x1a0 sys/kern/vfs_vnops.c:408
dofilewritev(ffff80002a5f7558,3,ffff80002a68b7b0,1,ffff80002a68b870) at dofilewritev+0x1a0 sys/kern/sys_generic.c:375
sys_pwritev(ffff80002a5f7558,ffff80002a68b920,ffff80002a68b870) at sys_pwritev+0xb6 sys/kern/vfs_syscalls.c:3352
syscall(ffff80002a68b920) at syscall+0x751 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7d8ea6d887d0, count: -7

Crashes (40):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/03/07 20:31 openbsd e9310faa4406 2b789849 .config console log report syz C [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: memset
2022/06/14 03:13 openbsd db879ab8e4d2 0f087040 .config console log report syz C ci-openbsd-main uvm_fault: memset
2021/08/08 04:45 openbsd 3395d9ad18ab 6972b106 .config console log report syz C ci-openbsd-multicore uvm_fault: memset
2024/03/19 00:19 openbsd d1ea0a7c7de9 6ee49f2e .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: memset
2024/03/10 13:07 openbsd c8df64f9c06b 6ee49f2e .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: memset
2024/03/08 18:16 openbsd 88b19e9437de 8e75c913 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: memset
2024/03/07 19:30 openbsd e9310faa4406 2b789849 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: memset
2024/02/24 06:50 openbsd bbad591d07d4 8d446f15 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: memset
2024/02/15 01:11 openbsd 04fce66c3f2b d9b1cdd5 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: memset
2024/02/04 07:07 openbsd 51dce3f82dc5 a67b2c42 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: memset
2023/12/03 16:13 openbsd 040dcbc58f4c f819d6f7 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: memset
2023/12/02 17:24 openbsd ae19b3a81c1a f819d6f7 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: memset
2023/07/26 00:10 openbsd 32582aa5b7f9 00adc293 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: memset
2023/06/03 00:07 openbsd 92190ee3632a a4ae4f42 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: memset
2023/03/14 16:30 openbsd 1e5b016c5082 0d5c4377 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: memset
2023/02/26 06:41 openbsd 1e5b016c5082 e792ae78 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: memset
2023/02/07 13:57 openbsd 0da56a053721 b68d0e75 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: memset
2023/01/19 09:56 openbsd 7c5efb429235 66fca3ae .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: memset
2023/01/14 18:23 openbsd 76b90a235db8 a63719e7 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: memset
2022/12/20 16:12 openbsd fea828ab47f1 d3e76707 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-multicore uvm_fault: memset
2022/11/23 09:56 openbsd d0597228d649 75740b3f .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: memset
2022/11/21 05:45 openbsd 11064cccbc3a 5bb70014 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: memset
2022/10/08 20:04 openbsd 5cb1d9dce18f aea5da89 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: memset
2022/09/21 18:05 openbsd 3fc7a1c74b2f 380f82fb .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main uvm_fault: memset
2022/09/20 05:04 openbsd 00f5031a633c dd9a85ff .config console log report ci-openbsd-main uvm_fault: memset
2022/08/31 17:08 openbsd 4bbd1b5285d2 51e54e30 .config console log report ci-openbsd-multicore uvm_fault: memset
2022/08/25 23:29 openbsd 59a54550596b e5fb9cf5 .config console log report ci-openbsd-multicore uvm_fault: memset
2022/07/13 07:55 openbsd 1cc9250c5648 5d921b08 .config console log report ci-openbsd-main uvm_fault: memset
2022/03/08 04:09 openbsd 30dd31d2109d 7bdd8b2c .config console log report ci-openbsd-main uvm_fault: memset
2022/03/06 11:45 openbsd a4cc87870bbc 7bdd8b2c .config console log report ci-openbsd-main uvm_fault: memset
2022/01/25 00:23 openbsd 0e162ba39fbe 2cbffd88 .config console log report ci-openbsd-multicore uvm_fault: memset
2022/01/24 19:45 openbsd 7f22cd74b38a 96ff84ef .config console log report ci-openbsd-multicore uvm_fault: memset
2022/01/24 18:41 openbsd 7f22cd74b38a 96ff84ef .config console log report ci-openbsd-multicore uvm_fault: memset
2022/01/24 18:13 openbsd 7f22cd74b38a 96ff84ef .config console log report ci-openbsd-multicore uvm_fault: memset
2022/01/24 17:25 openbsd 7f22cd74b38a 96ff84ef .config console log report ci-openbsd-multicore uvm_fault: memset
2022/01/24 16:50 openbsd 7f22cd74b38a 96ff84ef .config console log report ci-openbsd-multicore uvm_fault: memset
2022/01/16 11:04 openbsd b0877370f8cb 723cfaf0 .config console log report ci-openbsd-main uvm_fault: memset
2021/12/14 11:08 openbsd a7a431551857 5d14b1ea .config console log report ci-openbsd-main uvm_fault: memset
2021/12/10 00:52 openbsd f231ff592234 b54aa474 .config console log report ci-openbsd-multicore uvm_fault: memset
2021/08/29 18:49 openbsd 227bbaa63360 be2c130d .config console log report ci-openbsd-main uvm_fault: memset
* Struck through repros no longer work on HEAD.