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Date:   Thu, 17 Dec 2020 22:54:35 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Toralf Förster <toralf.foerster@....de>,
        jgg@...pe.ca
Cc:     Linux Kernel <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>
Subject: Re: 5.10.1: UBSAN: shift-out-of-bounds in ./include/linux/log2.h:57:1

Hi,

[adding linux-mm]

On 12/16/20 1:54 AM, Toralf Förster wrote:
> Hi,
> 
> I got this recently at this hardened Gentoo Linux server:
> 
> Linux mr-fox 5.10.1 #1 SMP Tue Dec 15 22:09:42 CET 2020 x86_64 Intel(R)
> Xeon(R) CPU E5-1650 v3 @ 3.50GHz GenuineIntel GNU/Linux
> 
> 
> Dec 15 23:31:51 mr-fox kernel: [ 1974.206972]
> ================================================================================
> Dec 15 23:31:51 mr-fox kernel: [ 1974.206977] UBSAN: shift-out-of-bounds
> in ./include/linux/log2.h:57:13
> Dec 15 23:31:51 mr-fox kernel: [ 1974.206980] shift exponent 64 is too
> large for 64-bit type 'long unsigned int'
> Dec 15 23:31:51 mr-fox kernel: [ 1974.206982] CPU: 11 PID: 21051 Comm:
> cc1 Tainted: G                T 5.10.1 #1
> Dec 15 23:31:51 mr-fox kernel: [ 1974.206984] Hardware name: ASUSTeK
> COMPUTER INC. Z10PA-U8 Series/Z10PA-U8 Series, BIOS 3703 08/02/2018
> Dec 15 23:31:51 mr-fox kernel: [ 1974.206985] Call Trace:
> Dec 15 23:31:51 mr-fox kernel: [ 1974.206993]  dump_stack+0x57/0x6a
> Dec 15 23:31:51 mr-fox kernel: [ 1974.206996]  ubsan_epilogue+0x5/0x40
> Dec 15 23:31:51 mr-fox kernel: [ 1974.206999]
> __ubsan_handle_shift_out_of_bounds.cold+0x61/0x10e
> Dec 15 23:31:51 mr-fox kernel: [ 1974.207002]
> ondemand_readahead.cold+0x16/0x21
> Dec 15 23:31:51 mr-fox kernel: [ 1974.207007]
> generic_file_buffered_read+0x452/0x890
> Dec 15 23:31:51 mr-fox kernel: [ 1974.207011]  new_sync_read+0x156/0x200
> Dec 15 23:31:51 mr-fox kernel: [ 1974.207014]  vfs_read+0xf8/0x190
> Dec 15 23:31:51 mr-fox kernel: [ 1974.207016]  ksys_read+0x65/0xe0
> Dec 15 23:31:51 mr-fox kernel: [ 1974.207018]  do_syscall_64+0x33/0x40
> Dec 15 23:31:51 mr-fox kernel: [ 1974.207021]
> entry_SYSCALL_64_after_hwframe+0x44/0xa9
> Dec 15 23:31:51 mr-fox kernel: [ 1974.207024] RIP: 0033:0x7f01b2df198e
> Dec 15 23:31:51 mr-fox kernel: [ 1974.207026] Code: c0 e9 b6 fe ff ff 50
> 48 8d 3d 66 c3 09 00 e8 59 e2 01 00 66 0f 1f 84 00 00 00 00 00 64 8b 04
> 25 18 00 00 00 85 c0 75 14 0f 05 <48> 3d 00 f0 ff ff 77 5a c3 66 0f 1f
> 84 00 00 00 00 00 48 83 ec 28
> Dec 15 23:31:51 mr-fox kernel: [ 1974.207028] RSP: 002b:00007fff2167e998
> EFLAGS: 00000246 ORIG_RAX: 0000000000000000
> Dec 15 23:31:51 mr-fox kernel: [ 1974.207030] RAX: ffffffffffffffda RBX:
> 0000000000000000 RCX: 00007f01b2df198e
> Dec 15 23:31:51 mr-fox kernel: [ 1974.207032] RDX: 0000000000000000 RSI:
> 00000000054dcc50 RDI: 0000000000000004
> Dec 15 23:31:51 mr-fox kernel: [ 1974.207033] RBP: 00000000054dcc50 R08:
> 00000000054dcc50 R09: 0000000000000000
> Dec 15 23:31:51 mr-fox kernel: [ 1974.207034] R10: 0000000000000000 R11:
> 0000000000000246 R12: 00000000054dc3b0
> Dec 15 23:31:51 mr-fox kernel: [ 1974.207035] R13: 0000000000008000 R14:
> 00000000054c9800 R15: 0000000000000000
> Dec 15 23:31:51 mr-fox kernel: [ 1974.207037]
> ================================================================================
> 
> 
> Known issue ?

Not that I have heard about, but that's not conclusive.

Looks to me like this is in mm/readahead.c:

static unsigned long get_init_ra_size(unsigned long size, unsigned long max)
{
	unsigned long newsize = roundup_pow_of_two(size);


What filesystem?  What workload?

thanks.
-- 
~Randy

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