syzbot


protection_fault: sys_msgrcv (2)

Status: upstream: reported syz repro on 2022/10/13 01:20
Reported-by: syzbot+c80235d951da9769a00f@syzkaller.appspotmail.com
First crash: 117d, last: 47d
similar bugs (1):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
openbsd protection_fault: sys_msgrcv 1 353d 353d 0/3 auto-closed as invalid on 2022/05/19 20:14

Sample crash report:
kernel: protection fault trap, code=0
Stopped at      sys_msgrcv+0x2df:       movq    0x10(%r13),%rdi
ddb{1}> 
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
the kernel did not panic
ddb{1}> trace
sys_msgrcv(ffff8000ffff1510,ffff8000215120c8,ffff800021512110) at sys_msgrcv+0x2df msg_copyout sys/kern/sysv_msg.c:639 [inline]
sys_msgrcv(ffff8000ffff1510,ffff8000215120c8,ffff800021512110) at sys_msgrcv+0x2df sys/kern/sysv_msg.c:349
syscall(ffff800021512190) at syscall+0x438 mi_syscall sys/sys/syscall_mi.h:101 [inline]
syscall(ffff800021512190) at syscall+0x438 sys/arch/amd64/amd64/trap.c:599
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xc39782acfb0, count: -3
ddb{1}> show registers
rdi                             0x1b
rsi                       0x20003b08
rbp               0xffff8000215120b0
rbx                             0x1b
rdx               0xffff80002150d000
rcx                                0
rax                                0
r8                    0x7f7fffffc000
r9                               0x1
r10                0x5dfc8098ec9deee
r11               0xafc63d6f66a616ed
r12               0xfffffd8072b38f28
r13               0xdeadbeefdeadbeef
r14               0xffff800000bf7000
r15                              0x8
rip               0xffffffff8222a11f    sys_msgrcv+0x2df
cs                               0x8
rflags                       0x10202    __ALIGN_SIZE+0xf202
rsp               0xffff800021512020
ss                              0x10
sys_msgrcv+0x2df:       movq    0x10(%r13),%rdi
ddb{1}> show proc
PROC (syz-executor.5) pid=180681 stat=onproc
    flags process=0 proc=4000000<THREAD>
    pri=36, usrpri=86, nice=20
    forw=0xffffffffffffffff, list=0xffff8000ffff02b0,0xffff8000ffff17c0
    process=0xffff8000213f0018 user=0xffff80002150d000, vmspace=0xfffffd80697aae70
    estcpu=36, cpticks=1, pctcpu=0.0
    user=0, sys=1, intr=0
ddb{1}> ps
   PID     TID   PPID    UID  S       FLAGS  WAIT          COMMAND
 99138  478496  40808      0  7           0                syz-executor.5
 99138  230952  40808      0  3   0x4000080  msgwait       syz-executor.5
*99138  180681  40808      0  7   0x4000000                syz-executor.5
 99138  494216  40808      0  3   0x4000080  msgwait       syz-executor.5
 99138  312635  40808      0  3   0x4000080  fsleep        syz-executor.5
 99138  117412  40808      0  2   0x4000000                syz-executor.5
 99138   84502  40808      0  2   0x4000000                syz-executor.5
 43449  156421  87809      0  3        0x80  nanoslp       syz-executor.1
 43449  344057  87809      0  3   0x4000080  msgwait       syz-executor.1
 43449  380720  87809      0  3   0x4000080  fsleep        syz-executor.1
 43449  436230  87809      0  3   0x4000080  msgwait       syz-executor.1
 43449  352733  87809      0  3   0x4000080  msgwait       syz-executor.1
 43449  394643  87809      0  3   0x4000080  fsleep        syz-executor.1
 50482  357005  23749      0  3        0x80  nanoslp       syz-executor.7
 50482  359006  23749      0  3   0x4000080  msgwait       syz-executor.7
 50482   62577  23749      0  3   0x4000080  msgwait       syz-executor.7
 50482  131253  23749      0  3   0x4000080  msgwait       syz-executor.7
 50482   41578  23749      0  3   0x4000080  fsleep        syz-executor.7
 50482  336938  23749      0  3   0x4000080  fsleep        syz-executor.7
 51647    6481  82929      0  3        0x80  nanoslp       syz-executor.6
 51647  521150  82929      0  3   0x4000080  msgwait       syz-executor.6
 51647  249152  82929      0  3   0x4000080  fsleep        syz-executor.6
 51647   71395  82929      0  3   0x4000080  msgwait       syz-executor.6
 51647  471449  82929      0  3   0x4000080  msgwait       syz-executor.6
 51647  193233  82929      0  3   0x4000080  fsleep        syz-executor.6
 59261  221126  45676      0  3        0x80  nanoslp       syz-executor.2
 59261  490117  45676      0  3   0x4000080  msgwait       syz-executor.2
 59261  519154  45676      0  3   0x4000080  msgwait       syz-executor.2
 59261  147243  45676      0  3   0x4000080  msgwait       syz-executor.2
 59261  365838  45676      0  3   0x4000080  fsleep        syz-executor.2
 59261  471863  45676      0  3   0x4000080  fsleep        syz-executor.2
 18641  124776  50814      0  3        0x80  nanoslp       syz-executor.3
 18641  271157  50814      0  3   0x4000080  msgwait       syz-executor.3
 18641  179618  50814      0  3   0x4000080  fsleep        syz-executor.3
 18641  151504  50814      0  3   0x4000080  msgwait       syz-executor.3
 18641  302374  50814      0  3   0x4000080  msgwait       syz-executor.3
 18641  408364  50814      0  3   0x4000080  fsleep        syz-executor.3
 18641  258697  50814      0  3   0x4000080  fsleep        syz-executor.3
 59682  458975  87334      0  3        0x80  nanoslp       syz-executor.0
 59682  335977  87334      0  3   0x4000080  msgwait       syz-executor.0
 59682  474493  87334      0  3   0x4000080  fsleep        syz-executor.0
 59682  375221  87334      0  3   0x4000080  msgwait       syz-executor.0
 59682  212907  87334      0  3   0x4000080  msgwait       syz-executor.0
 59682  322634  87334      0  3   0x4000080  fsleep        syz-executor.0
 59682  382136  87334      0  3   0x4000080  fsleep        syz-executor.0
 52405  359997  86146      0  3        0x80  nanoslp       syz-executor.4
 52405  193241  86146      0  3   0x4000080  msgwait       syz-executor.4
 52405    1948  86146      0  3   0x4000080  fsleep        syz-executor.4
 52405  459545  86146      0  3   0x4000080  msgwait       syz-executor.4
 52405   53410  86146      0  3   0x4000080  msgwait       syz-executor.4
 52405  481024  86146      0  3   0x4000080  fsleep        syz-executor.4
 50814  370497  49091      0  3        0x82  nanoslp       syz-executor.3
 23749  268037  49091      0  3        0x82  nanoslp       syz-executor.7
 87334  386856  49091      0  3        0x82  nanoslp       syz-executor.0
 40808  226632  49091      0  3        0x82  nanoslp       syz-executor.5
 86146   16258  49091      0  3        0x82  nanoslp       syz-executor.4
 45676  438519  49091      0  3        0x82  nanoslp       syz-executor.2
 82929   95175  49091      0  3        0x82  nanoslp       syz-executor.6
 87809  171110  49091      0  3        0x82  nanoslp       syz-executor.1
 49091  513154  58060      0  3        0x82  wait          syz-execprog
 49091  204581  58060      0  3   0x4000082  thrsleep      syz-execprog
 49091  498039  58060      0  3   0x4000082  wait          syz-execprog
 49091   71126  58060      0  3   0x4000082  wait          syz-execprog
 49091  229649  58060      0  3   0x4000082  thrsleep      syz-execprog
 49091  418904  58060      0  3   0x4000082  wait          syz-execprog
 49091   69229  58060      0  3   0x4000082  thrsleep      syz-execprog
 49091  491688  58060      0  3   0x4000082  wait          syz-execprog
 49091  510509  58060      0  3   0x4000082  thrsleep      syz-execprog
 49091   21027  58060      0  3   0x4000082  wait          syz-execprog
 49091  222974  58060      0  3   0x4000082  wait          syz-execprog
 49091   18720  58060      0  3   0x4000082  wait          syz-execprog
 49091  350854  58060      0  3   0x4000082  thrsleep      syz-execprog
 49091  115499  58060      0  3   0x4000082  kqread        syz-execprog
 49091  148539  58060      0  3   0x4000082  thrsleep      syz-execprog
 58060  218844     80      0  3    0x10008a  sigsusp       ksh
    80  508461  21889      0  3        0x9a  kqread        sshd
 86372  458591      1      0  3    0x100083  ttyin         getty
 21889  260224      1      0  3        0x88  kqread        sshd
 78353  189157  37429     73  3   0x1100090  kqread        syslogd
 37429  155061      1      0  3    0x100082  netio         syslogd
 38297  474587      1      0  3    0x100080  kqread        resolvd
 87321  225382  35490     77  3    0x100092  kqread        dhcpleased
 13036  219052  35490     77  3    0x100092  kqread        dhcpleased
 35490  189255      1      0  3        0x80  kqread        dhcpleased
 25085  522248      0      0  3     0x14200  bored         smr
 24457  313045      0      0  3     0x14200  pgzero        zerothread
 51282  145477      0      0  3     0x14200  aiodoned      aiodoned
 45245    3076      0      0  3     0x14200  syncer        update
 32927   94833      0      0  3     0x14200  cleaner       cleaner
 94713  113519      0      0  3     0x14200  reaper        reaper
 73111   29774      0      0  3     0x14200  pgdaemon      pagedaemon
 39717   71436      0      0  3     0x14200  bored         viomb
 79412  493519      0      0  3  0x40014200  acpi0         acpi0
 70652    6885      0      0  3  0x40014200                idle1
 59683  468944      0      0  3     0x14200  bored         softnet
 78284  165291      0      0  3     0x14200  bored         softnet
 70228  426378      0      0  3     0x14200  bored         softnet
 18808  307370      0      0  3     0x14200  bored         softnet
 27799  157185      0      0  3     0x14200  bored         systqmp
 52324  293475      0      0  3     0x14200  bored         systq
 72627    2665      0      0  3  0x40014200  bored         softclock
 11418  456831      0      0  3  0x40014200                idle0
     1  442172      0      0  3        0x82  wait          init
     0       0     -1      0  3     0x10200  scheduler     swapper
ddb{1}> show all locks
Process 99138 (syz-executor.5) thread 0xffff8000ffff1510 (180681)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829ee4c8)
#0  witness_lock+0x44d
#1  __mp_acquire_count+0x48 sys/kern/kern_lock.c:227
#2  mi_switch+0x3bb sys/kern/sched_bsd.c:415
#3  sleep_finish+0x180 sys/kern/kern_synch.c:417
#4  rw_enter+0x35a sys/kern/kern_rwlock.c:286
#5  uvmfault_lookup+0xc9 sys/uvm/uvm_fault.c:1773
#6  uvm_fault_check+0x3a sys/uvm/uvm_fault.c:673
#7  uvm_fault+0xf2 sys/uvm/uvm_fault.c:601
#8  kpageflttrap+0x22e sys/arch/amd64/amd64/trap.c:277
#9  kerntrap+0xef sys/arch/amd64/amd64/trap.c:332
#10 alltraps_kern_meltdown+0x7b
#11 copyout+0x53
#12 syscall+0x438 mi_syscall sys/sys/syscall_mi.h:101 [inline]
#12 syscall+0x438 sys/arch/amd64/amd64/trap.c:599
#13 Xsyscall+0x128
ddb{1}> show malloc
           Type InUse  MemUse  HighUse   Limit  Requests Type Lim
         devbuf 10185   6408K    6420K  78643K     11275        0
            pcb    13      8K       8K  78643K        13        0
         rtable   234      6K       6K  78643K       351        0
         ifaddr    71     16K      16K  78643K        73        0
       counters    60     35K      35K  78643K        60        0
       ioctlops     0      0K       2K  78643K        27        0
          mount     1      1K       1K  78643K         1        0
            log     0      0K       0K  78643K         4        0
         vnodes  1167     73K      73K  78643K      1180        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    18     65K      89K  78643K       165        0
           proc    55     78K     103K  78643K       463        0
    NFS srvsock     1      0K       0K  78643K         1        0
     NFS daemon     1     16K      16K  78643K         1        0
       in_multi    99      6K       6K  78643K        99        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       1K  78643K       362        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     8     62K      64K  78643K        10        0
       UVM amap   294     75K      75K  78643K      2857        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    11      0K       2K  78643K        27        0
           temp    84   4686K    4750K  78643K      4005        0
         kqueue    12     18K      18K  78643K        25        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       37    0       34     1     0     1     1     0     8    0
rtentry    112      111    0        1     4     0     4     4     0     8    0
unpcb      144       33    0       20     1     0     1     1     0     8    0
syncache   296        5    0        5     2     1     1     1     0     8    1
tcpqe       32       85    0       85     1     1     0     1     0     8    0
tcpcb      776        8    0        5     1     0     1     1     0     8    0
arp        120       18    0        0     1     0     1     1     0     8    0
inpcb      368       57    0       51     1     0     1     1     0     8    0
nd6         48       24    0        0     1     0     1     1     0     8    0
art_heap8  4096       1    0        0     1     0     1     1     0     8    0
art_heap4  256      452    0        0    29     0    29    29     0     8    0
art_table   32      453    0        0     4     0     4     4     0     8    0
art_node    16      110    0       10     1     0     1     1     0     8    0
sysvmsgpl   40      128    0      128     1     0     1     1     0     8    1
dirhash    1024      17    0        0     3     0     3     3     0     8    0
dino2pl    256     1502    0       72    90     0    90    90     0     8    0
ffsino     272     1502    0       72    96     0    96    96     0     8    0
nchpl      144     1783    0      115    63     0    63    63     0     8    0
uvmvnodes   80     1511    0        0    31     0    31    31     0     8    0
vnodes     216     1511    0        0    84     0    84    84     0     8    0
namei      1024    5916    0     5916     3     1     2     2     0     8    2
percpumem   16       42    0        0     1     0     1     1     0     8    0
kstatmem   264       22    0        0     2     0     2     2     0     8    0
scxspl     216     6076    0     6076    10     9     1     8     0     8    1
plimitpl   152       25    0       10     1     0     1     1     0     8    0
sigapl     424      460    0      414     6     0     6     6     0     8    0
futexpl     64      337    0      320     1     0     1     1     0     8    0
knotepl    120      106    0        0     4     0     4     4     0     8    0
kqueuepl   216       21    0       13     1     0     1     1     0     8    0
pipepl     320      132    0      104     4     1     3     3     0     8    0
fdescpl    496      443    0      414     6     1     5     5     0     8    0
filepl     152     1531    0     1403     6     0     6     6     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       25    0        9     1     0     1     1     0     8    0
pgrppl      48       25    0        9     1     0     1     1     0     8    0
ucredpl    104       66    0       56     1     0     1     1     0     8    0
zombiepl   144      414    0      414     2     1     1     1     0     8    1
processpl  1072     460    0      414     4     0     4     4     0     8    0
procpl     672      655    0      552     9     0     9     9     0     8    0
sockpl     488      127    0      105     4     0     4     4     0     8    1
mcl8k      8192       3    0        0     1     0     1     1     0     8    0
mcl4k      4096       4    0        0     1     0     1     1     0     8    0
mcl2k      2048     256    0        0    32     0    32    32     0     8    0
mtagpl      96        1    0        0     1     0     1     1     0     8    0
mbufpl     256      303    0        0    19     0    19    19     0     8    0
bufpl      288     3994    0      138   276     0   276   276     0     8    0
anonpl      24   124278    0   117118    60    15    45    46     0   186    1
amapchunkpl 152    7526    0     6891    27     1    26    26     0   158    1
amappl16   200     2150    0     2071     9     4     5     5     0     8    0
amappl15   192        4    0        4     1     1     0     1     0     8    0
amappl14   184      153    0      141     2     0     2     2     0     8    0
amappl13   176       20    0       19     2     1     1     1     0     8    0
amappl12   168      399    0      397     2     1     1     1     0     8    0
amappl11   160       49    0       39     1     0     1     1     0     8    0
amappl10   152       30    0       20     2     1     1     1     0     8    0
amappl9    144      931    0      931     2     1     1     1     0     8    1
amappl8    136      127    0       99     3     1     2     2     0     8    0
amappl7    128      135    0      119     2     0     2     2     0     8    0
amappl6    120      156    0      148     1     0     1     1     0     8    0
amappl5    112      112    0      106     1     0     1     1     0     8    0
amappl4    104      490    0      462     2     0     2     2     0     8    1
amappl3     96      743    0      666     2     0     2     2     0     8    0
amappl2     88      779    0      708     3     0     3     3     0     8    1
amappl1     80    12862    0    12035    24     2    22    22     0     8    5
amappl      88     2400    0     2195     5     0     5     5     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      443    0      414     1     0     1     1     0     8    0
uaddrbest   32        2    0        0     1     0     1     1     0     8    0
uaddr       24      443    0      414     1     0     1     1     0     8    0
vmmpekpl   168     9612    0     9587     2     0     2     2     0     8    0
vmmpepl    168    46582    0    44279   115     9   106   106     0   357    5
vmsppl     368      442    0      414     4     0     4     4     0     8    1
rwobjpl     56    16897    0    14129    44     1    43    43     0     8    4
pdppl      4096     893    0      828   103    36    67    77     0     8    2
pvpl        32   307185    0   294760   287    20   267   267     0   265  166
pmappl     248      442    0      414     4     1     3     3     0     8    0
extentpl    40       56    0       38     1     0     1     1     0     8    0
phpool     112      662    0       39    19     0    19    19     0     8    0
ddb{1}> machine ddbcpu 0
Stopped at      x86_ipi_db+0x1a:        addq    $0x8,%rsp
ddb{0}> trace
x86_ipi_db(ffffffff8296fff0) 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
__mp_lock(ffffffff829ee2c0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff829ee2c0) at __mp_lock+0x122 sys/kern/kern_lock.c:147
softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:88
Xsoftclock() at Xsoftclock+0x1f
end of kernel
end trace frame: 0x7f7ffffbee30, count: -6
ddb{0}> machine ddbcpu 1
Stopped at      sys_msgrcv+0x2df:       movq    0x10(%r13),%rdi
ddb{1}> 

Crashes (5):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci-openbsd-setuid 2022/12/21 22:22 openbsd bcc2e3d7508b 4067838e .config console log report syz [disk image] [bsd.gdb] [kernel image] protection_fault: sys_msgrcv
ci-openbsd-setuid 2022/12/19 22:38 openbsd 4068fef5c65e c52b2efb .config console log report syz [disk image] [bsd.gdb] [kernel image] protection_fault: sys_msgrcv
ci-openbsd-setuid 2022/12/21 21:54 openbsd bcc2e3d7508b 4067838e .config console log report [disk image] [bsd.gdb] [kernel image] protection_fault: sys_msgrcv
ci-openbsd-setuid 2022/12/19 22:00 openbsd 4068fef5c65e c52b2efb .config console log report [disk image] [bsd.gdb] [kernel image] protection_fault: sys_msgrcv
ci-openbsd-multicore 2022/10/13 01:20 openbsd ddd5e87dd012 89b5a509 .config console log report [disk image] [bsd.gdb] [kernel image] protection_fault: sys_msgrcv
* Struck through repros no longer work on HEAD.