From: Stanislaw Gruszka <sgruszka@redhat.com>
To: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: linux-kernel@vger.kernel.org, Al Viro <viro@zeniv.linux.org.uk>
Subject: NULL pointer dereference at fat_detach
Date: Tue, 30 Oct 2012 14:44:50 +0100 [thread overview]
Message-ID: <20121030134449.GA5435@redhat.com> (raw)
Hi
>From time to time Fedora users reports crash at fat_detach.
It happens randomly and seldom. Seems to be related with
unmount operation.
Early reports are from 3.0 and problem still randomly occurs
on recent kernels.
Calltraces looks like below:
BUG: unable to handle kernel NULL pointer dereference at 0000009c
IP: [<c046d983>] do_raw_spin_lock+0xd/0x1e
[<c07fcc94>] _raw_spin_lock+0xd/0xf
[<f8fe03de>] fat_detach+0x20/0x59 [fat]
[<f8fe0874>] fat_evict_inode+0x5b/0x5e [fat]
[<c05058ad>] evict+0x57/0xe9
[<c0505a67>] iput+0xf8/0xfd
[<c051ce0f>] fsnotify_destroy_mark+0xdf/0xf8
[<c051e488>] sys_inotify_rm_watch+0x59/0x79
[<c07fcfbc>] syscall_call+0x7/0xb
what most likely indicate that fat_evict is called with
inode with i_sb->s_fs_info == NULL.
Some more info about this problem can be found here:
https://bugzilla.redhat.com/show_bug.cgi?id=768534
Any insight on this isssue is welcome.
Thanks
Stanislaw
next reply other threads:[~2012-10-30 13:44 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-30 13:44 Stanislaw Gruszka [this message]
2012-10-30 21:30 ` NULL pointer dereference at fat_detach Paul Bolle
2012-10-31 0:49 ` OGAWA Hirofumi
2012-10-31 9:40 ` Paul Bolle
2012-10-31 9:59 ` OGAWA Hirofumi
2012-11-06 7:37 ` Namjae Jeon
2012-11-06 9:07 ` Stanislaw Gruszka
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