Re: [LKP] 7acf9d4237 BUG: kernel hang in test stage

Thanks for the report, looking into this..

On Mon, 2018-07-30 at 16:12 +0800, kernel test robot wrote:

Greetings,

0day kernel testing robot got the below dmesg and the first bad
commit is

https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git master

commit 7acf9d4237c46894e0fa0492dd96314a41742e84
Author:     Dmitry Safonov [off-list ref]
AuthorDate: Fri Jul 27 16:54:44 2018 +0100
Commit:     David S. Miller [off-list ref]
CommitDate: Sun Jul 29 12:50:19 2018 -0700

    netlink: Do not subscribe to non-existent groups
    
    Make ABI more strict about subscribing to group > ngroups.
    Code doesn't check for that and it looks bogus.
    (one can subscribe to non-existing group)
    Still, it's possible to bind() to all possible groups with (-1)
    
    Cc: "David S. Miller" [off-list ref]
    Cc: Herbert Xu [off-list ref]
    Cc: Steffen Klassert [off-list ref]
    Cc: netdev@vger.kernel.org
    Signed-off-by: Dmitry Safonov [off-list ref]
    Signed-off-by: David S. Miller [off-list ref]

9939a46d90  NET: stmmac: align DMA stuff to largest cache line length
7acf9d4237  netlink: Do not subscribe to non-existent groups
25432eba9c  openvswitch: meter: Fix setting meter id for new entries
+--------------------------------------------------+------------+--
----------+------------+

quoted

                                                 | 9939a46d90 |
7acf9d4237 | 25432eba9c |

+--------------------------------------------------+------------+--
----------+------------+

quoted

boot_successes                                   | 20         |
4          | 4          |
boot_failures                                    | 22         |
11         | 11         |
INFO:task_blocked_for_more_than#seconds          |
22         |            |            |
Kernel_panic-not_syncing:hung_task:blocked_tasks |
22         |            |            |
BUG:kernel_hang_in_test_stage                    | 0          |
11         | 11         |

+--------------------------------------------------+------------+--
----------+------------+

[ 1414.113020] Writes:  Total: 373492244  Max/Min: 0/0   Fail: 0 
[ 1472.149785] CE: Reprogramming failure. Giving up
[ 1475.552294] Writes:  Total: 387526813  Max/Min: 0/0   Fail: 0 
[ 1509.501097] CE: Reprogramming failure. Giving up
[ 1536.992336] Writes:  Total: 403788741  Max/Min: 0/0   Fail: 0 
BUG: kernel hang in test stage


                                                          # HH:MM
RESULT GOOD BAD GOOD_BUT_DIRTY DIRTY_NOT_BAD
git bisect start 0a930dcfc77cb12bbf9bffd69fbadcb0c237f577
d72e90f33aa4709ebecc5005562f52335e106a60 --
git bisect  bad f605359102be537b6217dc49600f4369d1f04932  #
07:19  B      0    11   27   0  Merge 'm68k/master' into devel-
catchup-201807300507
git bisect  bad 375347c493a490f493fafa02f30fa23179acbdb9  #
07:53  B      0    11   27   0  Merge 'linux-review/Todd-
Poynor/staging-gasket-fixes-and-cleanups/20180730-034316' into devel-
catchup-201807300507
git bisect good 86b34080126c3f4254a3f9e8d5dcb447d9233bc8  #
08:05  G     11     0    6   6  0day base guard for 'devel-catchup-
201807300507'
git bisect  bad ed28433e6f289d33dd6b4bbf627a60396234db58  #
08:40  B      0     1   17   0  Merge 'net/master' into devel-
catchup-201807300507
git bisect good 5b891af7fca14526b2a87c6f38b004e2df655ef4  #
08:54  G     11     0   11  11  bpf: Replace [u]int32_t and
[u]int64_t in libbpf
git bisect good c259b4fb33ee6e7667bf1d34bf0803b7c5fdbdce  #
09:03  G     10     0    3   3  netdevsim: don't leak devlink
resources
git bisect good b0753408aadf32c7ece9e6b765017881e54af833  #
09:17  G     11     0    3   3  net: mdio-mux: bcm-iproc: fix wrong
getter and setter pair
git bisect good 71eb5255f55bdb484d35ff7c9a1803f453dfbf82  #
09:25  G     11     0   11  11  bpf: use GFP_ATOMIC instead of
GFP_KERNEL in bpf_parse_prog()
git bisect good 6d27c6dd1012e7be748ec05da78556319718fbe7  #
09:39  G     11     0    4   4  Merge branch 'net-socket-Fix-
potential-spectre-v1-gadgets'
git bisect good 9939a46d90c6c76f4533d534dbadfa7b39dc6acc  #
09:55  G     11     0    7   7  NET: stmmac: align DMA stuff to
largest cache line length
git bisect  bad 25432eba9cd8f2ef5afef55be811b010a004b5fa  #
10:28  B      0    11   27   0  openvswitch: meter: Fix setting meter
id for new entries
git bisect  bad 7acf9d4237c46894e0fa0492dd96314a41742e84  #
11:03  B      0     6   22   0  netlink: Do not subscribe to non-
existent groups
# first bad commit: [7acf9d4237c46894e0fa0492dd96314a41742e84]
netlink: Do not subscribe to non-existent groups
git bisect good 9939a46d90c6c76f4533d534dbadfa7b39dc6acc  #
11:14  G     31     0   15  22  NET: stmmac: align DMA stuff to
largest cache line length
# extra tests with debug options
git bisect  bad 7acf9d4237c46894e0fa0492dd96314a41742e84  #
11:48  B      0    11   27   0  netlink: Do not subscribe to non-
existent groups
# extra tests on HEAD of linux-devel/devel-catchup-201807300507
git bisect  bad 0a930dcfc77cb12bbf9bffd69fbadcb0c237f577  #
11:49  B      0    13   31   0  0day head guard for 'devel-catchup-
201807300507'
# extra tests on tree/branch net/master
git bisect  bad 25432eba9cd8f2ef5afef55be811b010a004b5fa  #
11:50  B      0    11   27   0  openvswitch: meter: Fix setting meter
id for new entries
# extra tests with first bad commit reverted
git bisect good e61543e57747e8fd80390af39504365a392cef2b  #
12:04  G     11     0    4   4  Revert "netlink: Do not subscribe to
non-existent groups"

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