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

From: kernel test robot <[email-masked]>
Date: Mon, 30 Jul 2018 16:12:19 +0800

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 <[email-masked]>
AuthorDate: Fri Jul 27 16:54:44 2018 +0100
Commit:     David S. Miller <[email-masked]>
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" <[email-masked]>
    Cc: Herbert Xu <[email-masked]>
    Cc: Steffen Klassert <[email-masked]>
    Cc: [email-masked]
    Signed-off-by: Dmitry Safonov <[email-masked]>
    Signed-off-by: David S. Miller <[email-masked]>

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
+--------------------------------------------------+------------+------------+------------+
|                                                  | 9939a46d90 | 7acf9d4237 | 25432eba9c |
+--------------------------------------------------+------------+------------+------------+
| 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"

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/lkp                          Intel Corporation