Bug 119491 - UBSAN: Undefined behaviour in /home/vitti/1tb/vitti/rpmbuild/SOURCES/linux-4.5/fs/ext4/mballoc.c:1274
Summary: UBSAN: Undefined behaviour in /home/vitti/1tb/vitti/rpmbuild/SOURCES/linux-4....
Status: NEW
Alias: None
Product: File System
Classification: Unclassified
Component: ext4 (show other bugs)
Hardware: x86-64 Linux
: P1 low
Assignee: fs_ext4@kernel-bugs.osdl.org
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2016-06-02 04:43 UTC by Vittorio
Modified: 2016-06-02 04:43 UTC (History)
0 users

See Also:
Kernel Version: 4.5.5
Subsystem:
Regression: No
Bisected commit-id:

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Description Vittorio 2016-06-02 04:43:38 UTC 
At boot time I get the following:

Jun 02 04:01:53 nero21 kernel: ================================================================================
Jun 02 04:01:53 nero21 kernel: UBSAN: Undefined behaviour in /home/vitti/1tb/vitti/rpmbuild/SOURCES/linux-4.5/fs/ext4/mballoc.c:1274:11
Jun 02 04:01:53 nero21 kernel: shift exponent -1 is negative
Jun 02 04:01:53 nero21 kernel: CPU: 1 PID: 1 Comm: systemd Not tainted 4.5.5 #1
Jun 02 04:01:53 nero21 kernel: Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./H81M-DGS R2.0, BIOS P1.30 07/02/2014
Jun 02 04:01:53 nero21 kernel:  0000000000000000 0000000006c36e94 ffff88040cf5b868 ffffffff820d38ba
Jun 02 04:01:53 nero21 kernel:  ffffffff87f8c73e 0000000006c36e94 ffff88040cf5b890 ffffffff87f8c73e
Jun 02 04:01:53 nero21 kernel:  ffff88040cf5b880 ffffffff8215e6a4 ffffffffffffffff ffff88040cf5b918
Jun 02 04:01:53 nero21 kernel: Call Trace:
Jun 02 04:01:53 nero21 kernel:  [<ffffffff820d38ba>] dump_stack+0x74/0xaf
Jun 02 04:01:53 nero21 kernel:  [<ffffffff8215e6a4>] ubsan_epilogue+0xd/0x3b
Jun 02 04:01:53 nero21 kernel:  [<ffffffff8215eff5>] __ubsan_handle_shift_out_of_bounds+0xf9/0x14b
Jun 02 04:01:53 nero21 kernel:  [<ffffffff816c84bc>] ? ext4_mb_init_cache+0x3ed/0x129a
Jun 02 04:01:53 nero21 kernel:  [<ffffffff816c1037>] mb_find_order_for_block+0xff/0x143
Jun 02 04:01:53 nero21 kernel:  [<ffffffff816c1968>] mb_find_extent+0xd7/0x4dd
Jun 02 04:01:53 nero21 kernel:  [<ffffffff820dcda2>] ? radix_tree_lookup_slot+0x22/0x47
Jun 02 04:01:53 nero21 kernel:  [<ffffffff816c5f38>] ext4_mb_complex_scan_group+0x12b/0x577
Jun 02 04:01:53 nero21 kernel:  [<ffffffff813d35ad>] ? pagecache_get_page+0x1da/0x516
Jun 02 04:01:53 nero21 kernel:  [<ffffffff8148ac9f>] ? ___slab_alloc+0x3fe/0xa5c
Jun 02 04:01:53 nero21 kernel:  [<ffffffff816cf0b3>] ext4_mb_regular_allocator+0x2e4/0x78d
Jun 02 04:01:53 nero21 kernel:  [<ffffffff816d2b60>] ext4_mb_new_blocks+0x3cd/0xaa3
Jun 02 04:01:53 nero21 kernel:  [<ffffffff816b0660>] ? ext4_ext_put_gap_in_cache+0xe7/0x181
Jun 02 04:01:53 nero21 kernel:  [<ffffffff816b8570>] ext4_ext_map_blocks+0xa6c/0x16bf
Jun 02 04:01:53 nero21 kernel:  [<ffffffff816bdd01>] ? __ext4_handle_dirty_metadata+0x48/0x374
Jun 02 04:01:53 nero21 kernel:  [<ffffffff816e19b9>] ? ext4_es_lookup_extent+0x37/0x3d8
Jun 02 04:01:53 nero21 kernel:  [<ffffffff8165eeb4>] ext4_map_blocks+0x1c5/0x639
Jun 02 04:01:53 nero21 kernel:  [<ffffffff8166504b>] ? ext4_mark_inode_dirty+0x86/0x415
Jun 02 04:01:53 nero21 kernel:  [<ffffffff816600cf>] ext4_getblk+0x4e/0x285
Jun 02 04:01:53 nero21 kernel:  [<ffffffff81660328>] ext4_bread+0x22/0xce
Jun 02 04:01:53 nero21 kernel:  [<ffffffff816708c9>] ext4_append+0x89/0x1bf
Jun 02 04:01:53 nero21 kernel:  [<ffffffff8167a7ed>] ext4_mkdir+0x2e9/0x6ff
Jun 02 04:01:53 nero21 kernel:  [<ffffffff814eb1a2>] vfs_mkdir+0xe7/0x246
Jun 02 04:01:53 nero21 kernel:  [<ffffffff814eb51b>] SyS_mkdir+0x9e/0x17d
Jun 02 04:01:53 nero21 kernel:  [<ffffffff85c8ec67>] ? SyS_socketpair+0x1cb/0x326
Jun 02 04:01:53 nero21 kernel:  [<ffffffff865aa3ee>] entry_SYSCALL_64_fastpath+0x12/0x71
Jun 02 04:01:53 nero21 kernel: ================================================================================

mballoc.c:1274 is "bb += 1 << (e4b->bd_blkbits - order);"
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