Re: [delayed_fput] BUG: unable to handle kernel paging request at ffff8800122a0ad0

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On Wed, Jul 30, 2014 at 07:53:15PM -0700, Alexei Starovoitov wrote:
> On Wed, Jul 30, 2014 at 7:40 PM, Fengguang Wu <fengguang.wu@xxxxxxxxx> wrote:
> > On Wed, Jul 30, 2014 at 04:00:58PM -0700, Alexei Starovoitov wrote:
> >> On Wed, Jul 30, 2014 at 3:51 PM, David Rientjes <rientjes@xxxxxxxxxx> wrote:
> >> > On Wed, 30 Jul 2014, Christoph Hellwig wrote:
> >> >
> >> >> On Wed, Jul 30, 2014 at 11:55:41AM +0800, Fengguang Wu wrote:
> >> >> > Greetings,
> >> >> >
> >> >> > 0day kernel testing robot got the below dmesg and the first bad commit is
> >> >>
> >> >> How does this manage to trip over a 2 year old commit now?
> >>
> >> may be because all kernels are built with gcc 4.8.2 ?
> >> Fengguang, did you recently switch to new compiler?
> >> I think all older builds were with 4.6.3
> >
> > Alexei, I've been using gcc 4.8.2 for 4 months.
> >
> > Maybe it's because I test new randconfigs every day. And the problem
> > may only show up with very specific kernel config?
> 
> It seems a lot of odd crashes suddenly showed up and I'm guessing it
> may be related to compiler...
> See commit 2062afb4f8 ("Fix gcc-4.9.0 miscompilation of load_balance()
>  in scheduler")
> it's a nasty gcc bug that affects 4.9 and 4.8.
> I think it makes sense to apply that workaround before debugging much with 4.8
> just to eliminate the possibility of miscompiled code.

I tried boot testing 2062afb4f8~ and 2062afb4f8 with the same kernel
config. It looks make no much difference, at least for the problem in
this thread.

+-------------------------------------------------------------------------+------------+------------+
|                                                                         | 8bdd638091 | 2062afb4f8 |
+-------------------------------------------------------------------------+------------+------------+
| boot_successes                                                          | 253        | 252        |
| boot_failures                                                           | 47         | 48         |
| BUG:kernel_boot_hang                                                    | 12         | 3          |
| BUG:unable_to_handle_kernel_paging_request                              | 10         | 15         |
| Oops                                                                    | 12         | 17         |
| RIP:__fsnotify_update_child_dentry_flags                                | 2          |            |
| Kernel_panic-not_syncing:Fatal_exception                                | 21         | 26         |
| backtrace:fsnotify_add_mark_locked                                      | 3          | 1          |
| backtrace:SyS_inotify_add_watch                                         | 3          | 1          |
| BUG:Bad_page_state_in_process                                           | 10         | 17         |
| backtrace:cryptd_alloc_ablkcipher                                       | 4          | 5          |
| backtrace:ablk_init_common                                              | 4          | 5          |
| backtrace:ablk_init                                                     | 4          | 5          |
| backtrace:cryptomgr_test                                                | 21         | 30         |
| BUG:spinlock_bad_magic_on_CPU                                           | 3          | 4          |
| RIP:__d_lookup_rcu                                                      | 2          |            |
| backtrace:do_sys_open                                                   | 1          |            |
| backtrace:SyS_open                                                      | 1          |            |
| backtrace:smpboot_thread_fn                                             | 4          | 3          |
| general_protection_fault                                                | 9          | 9          |
| RIP:crypto_ahash_setkey                                                 | 10         | 10         |
| RIP:kzfree                                                              | 6          | 13         |
| backtrace:vfs_stat                                                      | 2          |            |
| backtrace:SyS_newstat                                                   | 2          |            |
| WARNING:CPU:PID:at_kernel/sched/core.c:wake_up_process()                | 1          |            |
| BUG:unable_to_handle_kernel_NULL_pointer_dereference                    | 2          | 2          |
| backtrace:iterate_dir                                                   | 1          | 3          |
| backtrace:SyS_getdents                                                  | 1          | 3          |
| RIP:worker_thread                                                       | 1          |            |
| Kernel_panic-not_syncing:VFS:Unable_to_mount_root_fs_on_unknown-block() | 1          |            |
| backtrace:prepare_namespace                                             | 1          |            |
| backtrace:kernel_init_freeable                                          | 1          | 2          |
| RIP:slob_page_alloc                                                     | 0          | 1          |
| backtrace:do_fork                                                       | 0          | 1          |
| backtrace:SyS_clone                                                     | 0          | 1          |
| backtrace:crypto_register_algs                                          | 0          | 2          |
| backtrace:crypto_null_mod_init                                          | 0          | 1          |
| backtrace:twofish_init                                                  | 0          | 1          |
| RIP:spin_dump                                                           | 0          | 1          |
| RIP:process_one_work                                                    | 0          | 1          |
+-------------------------------------------------------------------------+------------+------------+

Thanks,
Fengguang

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