syzbot


protection_fault: sys_semop

Status: upstream: reported C repro on 2024/02/29 03:16
Reported-by: syzbot+53b2e095be6ecaf39fd0@syzkaller.appspotmail.com
First crash: 111d, last: 27d
Last patch testing requests (2)
Created Duration User Patch Repo Result
2024/05/23 03:59 9m retest repro openbsd report log
2024/03/14 03:48 10m retest repro openbsd report log

Sample crash report:
kernel: protection fault trap, code=0
Stopped at      sys_semop+0x2f7:        movzwl  0(%r13),%ebx
ddb> 
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
the kernel did not panic
ddb> trace
sys_semop(ffff80002a5c7a98,ffff80002a65b330,ffff80002a65b280) at sys_semop+0x2f7 sys/kern/sysv_sem.c:615
syscall(ffff80002a65b330) at syscall+0x751 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xfb14b5fde40, count: -3
ddb> show registers
rdi                                0
rsi                                0
rbp               0xffff80002a65b250
rbx                                0
rdx               0xffff80002a656000
rcx                                0
rax               0xdeadbeefdeadbeef
r8                    0x7f7fffffc000
r9                0xfffffd807f7d7af8
r10               0x6026e36e2a115ea6
r11               0x68251e1946981e3b
r12                                0
r13               0xdeadbeefdeadbeef
r14               0xffff80002a65b330
r15               0xfffffd806c350e70
rip               0xffffffff81aa4ae7    sys_semop+0x2f7
cs                               0x8
rflags                       0x10246    __ALIGN_SIZE+0xf246
rsp               0xffff80002a65b150
ss                              0x10
sys_semop+0x2f7:        movzwl  0(%r13),%ebx
ddb> show proc
PROC (syz-executor113882395) tid=310877 pid=93763 tcnt=4 stat=onproc
    flags process=2<EXEC> proc=4000000<THREAD>
    runpri=4, usrpri=52, slppri=4, nice=20
    wchan=0x0, wmesg=, ps_single=0x0
    forw=0xffffffffffffffff, list=0xffff80002a5c72a0,0xffff80002a61c818
    process=0xffff8000ffff50d0 user=0xffff80002a656000, vmspace=0xfffffd80074ba160
    estcpu=2, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 93763  152628  22222      0  2       0x482                syz-executor113882395
 93763  217003  22222      0  3   0x4000082  fsleep        syz-executor113882395
*93763  310877  22222      0  7   0x4000002                syz-executor113882395
 93763  522996  22222      0  3   0x4000082  fsleep        syz-executor113882395
 22222  351092   7184      0  3    0x10008a  sigsusp       ksh
  7184  353210  35762      0  3        0x9a  kqread        sshd
 52309  486534      1      0  3    0x100083  ttyin         getty
 35762  230693      1      0  3        0x88  kqread        sshd
 26058  456709   8474     73  3   0x1100090  kqread        syslogd
  8474  520725      1      0  3    0x100082  netio         syslogd
 22939  381312      1      0  3    0x100080  kqread        resolvd
 92199  311396  92023     77  3    0x100092  kqread        dhcpleased
 15952   83569  92023     77  3    0x100092  kqread        dhcpleased
 92023   35345      1      0  3        0x80  kqread        dhcpleased
 78385  254162      0      0  3     0x14200  bored         smr
 38952  175134      0      0  3     0x14200  pgzero        zerothread
 99740   30578      0      0  3     0x14200  aiodoned      aiodoned
 63178  139637      0      0  3     0x14200  syncer        update
 51128  163003      0      0  3     0x14200  cleaner       cleaner
 67979  311066      0      0  3     0x14200  reaper        reaper
 55470   25643      0      0  3     0x14200  pgdaemon      pagedaemon
 26564  166329      0      0  3     0x14200  bored         viomb
 41572  145179      0      0  3  0x40014200  acpi0         acpi0
 29343  398639      0      0  3     0x14200  bored         softnet3
 56889  393905      0      0  3     0x14200  bored         softnet2
 59457  403910      0      0  3     0x14200  bored         softnet1
 17941  312070      0      0  3     0x14200  bored         softnet0
   812  427211      0      0  3     0x14200  bored         systqmp
 98314  462004      0      0  3     0x14200  bored         systq
 60356  320132      0      0  3  0x40014200  tmoslp        softclock
 82014  213226      0      0  3  0x40014200                idle0
     1   99025      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 10137   6382K    6413K 166960K     11215        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      1187        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     3      0K       0K 166960K         4        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    98     12K      12K 166960K      2213        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      2781        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       73    0       73     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       97    0        0     7     0     7     7     0     8    0
art_table   32       98    0        0     1     0     1     1     0     8    0
art_node    16       22    0        2     1     0     1     1     0     8    0
semapl     112        1    0        1     1     0     1     1     0     8    1
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     1606    0       47    58     0    58    58     0     8    0
uvmvnodes   80     1432    0        0    30     0    30    30     0     8    0
vnodes     216     1432    0        0    80     0    80    80     0     8    0
namei      1024    4258    0     4258     1     0     1     1     0     8    1
kstatmem   264        6    0        0     1     0     1     1     0     8    0
scxspl     216     5322    0     5322     8     0     8     8     1     8    8
plimitpl   152       17    0       10     1     0     1     1     0     8    0
sigapl     424      308    0      279     4     0     4     4     0     8    0
futexpl     64        8    0        6     1     0     1     1     0     8    0
knotepl    120     3728    0     3699     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      292    0      279     2     0     2     2     0     8    0
filepl     120     1127    0     1073     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       66    0       56     1     0     1     1     0     8    0
zombiepl   144      279    0      279     1     0     1     1     0     8    1
processpl  1072     308    0      279     3     0     3     3     0     8    0
procpl     680      311    0      279     3     0     3     3     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   12212    0    12170    33    19    14    32     0     8    7
mtagpl      96        4    0        4     1     0     1     1     0     8    1
mbufpl     256    19597    0    19550    17     5    12    17     0     8    6
bufpl      280     2514    0       86   174     0   174   174     0     8    0
anonpl      24   212230    0   210341    24     0    24    24     0   188   12
amapchunkpl 152    9280    0     9112     7     0     7     7     0   158    0
amappl16   200     6224    0     6224     5     0     5     5     0     8    5
amappl15   192       16    0       16     1     0     1     1     0     8    1
amappl14   184      109    0       99     1     0     1     1     0     8    0
amappl13   176       10    0       10     1     0     1     1     0     8    1
amappl12   168      799    0      786     1     0     1     1     0     8    0
amappl11   160       51    0       41     1     0     1     1     0     8    0
amappl10   152       19    0       19     1     0     1     1     0     8    1
amappl9    144      104    0      104     1     0     1     1     0     8    1
amappl8    136       55    0       53     1     0     1     1     0     8    0
amappl7    128       87    0       76     1     0     1     1     0     8    0
amappl6    120      119    0      114     1     0     1     1     0     8    0
amappl5    112      109    0      101     1     0     1     1     0     8    0
amappl4    104      324    0      308     1     0     1     1     0     8    0
amappl3     96     2484    0     2446     1     0     1     1     0     8    0
amappl2     88      619    0      570     2     0     2     2     0     8    0
amappl1     80     8820    0     8391    11     0    11    11     0     8    0
amappl      88     1945    0     1886     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      292    0      279     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24      292    0      279     1     0     1     1     0     8    0
vmmpekpl   168     6777    0     6760     1     0     1     1     0     8    0
vmmpepl    168    35111    0    34174    46     0    46    46     0   357    5
vmsppl     352      291    0      279     2     0     2     2     0     8    0
rwobjpl     24    19927    0    17856    14     0    14    14     0     8    1
pdppl      4096     590    0      558    48    14    34    40     0     8    2
pvpl        32   306152    0   301874    52     0    52    52     0   265   15
pmappl     216      291    0      279     1     0     1     1     0     8    0
extentpl    40       56    0       38     1     0     1     1     0     8    0
phpool     112      290    0       38     8     0     8     8     0     8    0
ddb> machine ddbcpu 0
No such command
ddb> trace
sys_semop(ffff80002a5c7a98,ffff80002a65b330,ffff80002a65b280) at sys_semop+0x2f7 sys/kern/sysv_sem.c:615
syscall(ffff80002a65b330) at syscall+0x751 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xfb14b5fde40, count: -3
ddb> machine ddbcpu 1
No such command
ddb> trace
sys_semop(ffff80002a5c7a98,ffff80002a65b330,ffff80002a65b280) at sys_semop+0x2f7 sys/kern/sysv_sem.c:615
syscall(ffff80002a65b330) at syscall+0x751 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xfb14b5fde40, count: -3
ddb> 

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/02/29 03:47 openbsd e5d416df88ac 352ab904 .config console log report syz C [disk image] [bsd.gdb] [kernel image] ci-openbsd-main protection_fault: sys_semop
2024/02/29 03:16 openbsd e5d416df88ac 352ab904 .config console log report [disk image] [bsd.gdb] [kernel image] ci-openbsd-main protection_fault: sys_semop
* Struck through repros no longer work on HEAD.