Messages in this thread | | | Subject | Re: NULL pointer dereference at fat_detach | From | Paul Bolle <> | Date | Tue, 30 Oct 2012 22:30:46 +0100 |
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On Tue, 2012-10-30 at 14:44 +0100, Stanislaw Gruszka wrote: > 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.
0) I remembered running into an almost identical Oops recently, but not reporting it because I was unable to reproduce it. It appeared to be triggered by unmounting and/or removing a USB stick.
1) For what it's worth, the last few lines in the logs before this Oops were: [...] Oct 17 11:50:41 x61 udisksd[1170]: Mounted /dev/sdb1 at /run/media/[...]/LIVE on behalf of uid 1000 Oct 17 11:52:36 x61 udisksd[1170]: Cleaning up mount point /run/media/[...]/LIVE (device 8:17 is not mounted) Oct 17 11:52:36 x61 kernel: [15141.653798] VFS: Busy inodes after unmount of sdb1. Self-destruct in 5 seconds. Have a nice day...
Paul Bolle
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