Messages in this thread | | | Date | Tue, 30 Oct 2012 14:44:50 +0100 | From | Stanislaw Gruszka <> | Subject | NULL pointer dereference at fat_detach |
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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
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