From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 114701] New: ubsan: "shift exponent -1 is negative" in
fs/ext4/mballoc.c:2612:15
Date: Tue, 15 Mar 2016 19:53:38 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=114701
Bug ID: 114701
Summary: ubsan: "shift exponent -1 is negative" in
fs/ext4/mballoc.c:2612:15
Product: File System
Version: 2.5
Kernel Version: 4.5.0
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: ext4
Assignee: fs_ext4@kernel-bugs.osdl.org
Reporter: peter@arbitrary.ch
Regression: No
The following message appeared during boot:
Mar 15 12:09:22 ivy kernel:
================================================================================
Mar 15 12:09:22 ivy kernel: UBSAN: Undefined behaviour in
fs/ext4/mballoc.c:2612:15
Mar 15 12:09:22 ivy kernel: shift exponent -1 is negative
Mar 15 12:09:22 ivy kernel: CPU: 1 PID: 657 Comm: mount Not tainted 4.5.0-pege1
#1
Mar 15 12:09:22 ivy kernel: Hardware name: Hewlett-Packard HP ENVY dv6 Notebook
PC/181B, BIOS F.29 10/03/2013
Mar 15 12:09:22 ivy kernel: 0000000000000000 00000000450d838f ffffffff816fcef7
0000000000000001
Mar 15 12:09:22 ivy kernel: 00000000450d838f ffff880449cfbb90 ffff880449cfbc10
ffffffff817952a9
Mar 15 12:09:22 ivy kernel: ffffffffc324f17e ffffffff81795caa 0000000000000202
000000000000312d
Mar 15 12:09:22 ivy kernel: Call Trace:
Mar 15 12:09:22 ivy kernel: [] ? dump_stack+0x70/0xb9
Mar 15 12:09:22 ivy kernel: [] ? ubsan_epilogue+0x9/0x40
Mar 15 12:09:22 ivy kernel: [] ?
__ubsan_handle_shift_out_of_bounds+0xfa/0x150
Mar 15 12:09:22 ivy kernel: [] ? use_mm+0x3e1/0x5d0
Mar 15 12:09:22 ivy kernel: [] ? ext4_mb_init+0xbf8/0xf70
[ext4]
Mar 15 12:09:22 ivy kernel: [] ?
ext4_setup_system_zone+0x20b/0x4d0 [ext4]
Mar 15 12:09:22 ivy kernel: [] ?
ext4_fill_super+0x52fe/0x83a0 [ext4]
Mar 15 12:09:22 ivy kernel: [] ? snprintf+0x49/0x60
Mar 15 12:09:22 ivy kernel: [] ?
ext4_calculate_overhead+0xc90/0xc90 [ext4]
Mar 15 12:09:22 ivy kernel: [] ? mount_bdev+0x1a9/0x290
Mar 15 12:09:22 ivy kernel: [] ? mount_fs+0x4a/0x280
Mar 15 12:09:22 ivy kernel: [] ? vfs_kern_mount+0x76/0x290
Mar 15 12:09:22 ivy kernel: [] ? do_mount+0x2ac/0x1be0
Mar 15 12:09:22 ivy kernel: [] ?
copy_mount_options+0x35/0x320
Mar 15 12:09:22 ivy kernel: [] ? SyS_mount+0x84/0xc0
Mar 15 12:09:22 ivy kernel: [] ?
entry_SYSCALL_64_fastpath+0x16/0x75
Mar 15 12:09:22 ivy kernel:
================================================================================
Let me know if you need more information.
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