* PaX: size overflow detected
@ 2016-03-29 23:31 Alec Blayne
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From: Alec Blayne @ 2016-03-29 23:31 UTC (permalink / raw)
To: linux-btrfs
Hi, I got this warning on dmesg:
PAX: size overflow detected in function btrfs_get_extent
fs/btrfs/inode.c:6690 cicus.1228_386 min, count: 104, decl: len; num: 0;
context: extent_map;
Which was followed by this Call Trace:
[ 354.375166] Call Trace:
[ 354.375173] [<ffffffff81421945>] ? dump_stack+0x47/0x72
[ 354.375177] [<ffffffff811a94c5>] ? report_size_overflow+0x65/0x80
[ 354.375182] [<ffffffff812de407>] ? btrfs_get_extent+0xd07/0xd40
[ 354.375186] [<ffffffff81301e55>] ? __do_readpage+0x295/0xef0
[ 354.375189] [<ffffffff812fdd1c>] ? insert_state+0x9c/0x120
[ 354.375191] [<ffffffff812dd700>] ? btrfs_direct_IO+0x500/0x500
[ 354.375195] [<ffffffff810b84ac>] ? get_parent_ip+0xc/0x30
[ 354.375197] [<ffffffff81302fe6>] ?
__extent_readpages.constprop.43+0x316/0x360
[ 354.375200] [<ffffffff812dd700>] ? btrfs_direct_IO+0x500/0x500
[ 354.375202] [<ffffffff81304c1d>] ? extent_readpages+0x17d/0x190
[ 354.375204] [<ffffffff812dd700>] ? btrfs_direct_IO+0x500/0x500
[ 354.375207] [<ffffffff81184c3f>] ? alloc_pages_current+0x7f/0x110
[ 354.375209] [<ffffffff81147585>] ? __do_page_cache_readahead+0x1c5/0x240
[ 354.375211] [<ffffffff811476d9>] ? ondemand_readahead+0xd9/0x300
[ 354.375214] [<ffffffff81139965>] ? find_get_entry+0x65/0xa0
[ 354.375216] [<ffffffff8113a172>] ? pagecache_get_page+0x22/0x1b0
[ 354.375218] [<ffffffff8113b65d>] ? generic_file_read_iter+0x61d/0x7b0
[ 354.375220] [<ffffffff811a179b>] ? __vfs_read+0xdb/0x100
[ 354.375222] [<ffffffff811a22a6>] ? vfs_read+0xc6/0x250
[ 354.375224] [<ffffffff811a37b2>] ? SyS_pread64+0x82/0xa0
[ 354.375228] [<ffffffff818cf9d9>] ? entry_SYSCALL_64_fastpath+0x12/0x83
[ 354.375230] [<ffffffff818cfb61>] ? int_ret_from_sys_call+0x3a/0xa4
After this a process which was writting on the disk just hanged,
couldn't kill it etc.
Thought it might interest someone.
I'm running the following kernel on Gentoo:
"Linux faraday 4.4.6-hardened #7 SMP PREEMPT Sun Mar 27 10:37:51 WEST
2016 x86_64 Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz GenuineIntel GNU/Linux"
It has grsecurity patchset, as well as BFQ scheduler.
The filesystem is a two partition raid 1, sitting on top of luks.
Cheers.
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2016-03-29 23:31 PaX: size overflow detected Alec Blayne
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