All, building my Linux kernel will newer version of gcc is giving soft loockup on any file system related commands eg on fdisk -l. I could not understand how gcc upgrade might be linked with this issue. Can any one help me to point out how can I debug this lockup in kernel ? and how could this be linked up with gcc upgrade. OLD GCC VERSION = 4.8.5 NEW GCC VERSION = 4.9.4 / # fdisk -l Disk /dev/sda: 998.9 GB, 998999326720 bytes 255 heads, 63 sectors/track, 121454 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 123 987966 83 Linux /dev/sda4 124 121454 974591257+ 5 Extended /dev/sda5 124 246 987966 83 Linux /dev/sda6 247 369 987966 83 Linux /dev/sda7 370 856 3911796 83 Linux /dev/sda8 857 1343 3911796 83 Linux /dev/sda9 1344 4262 23446836 83 Linux /dev/sda10 4263 4385 987966 83 Linux /dev/sda11 4386 5359 7823623+ 82 Linux swap /dev/sda12 5360 5361 16033+ 83 Linux /dev/sda13 5362 7794 19543041 83 Linux /dev/sda14 7795 121454 912973918+ 83 Linux BUG: soft lockup - CPU#1 stuck for 61s! [fdisk:268] Modules linked in: CPU 1: Modules linked in: Pid: 268, comm: fdisk Not tainted 2.6.32.24-ws-symbol #1 S5520UR RIP: 0010:[<ffffffff81068c1a>] [<ffffffff81068c1a>] smp_call_function_many+0x1aa/0x220 RSP: 0018:ffff88096ccd5d48 EFLAGS: 00000202 RAX: 0000000000000018 RBX: ffff88096ccd5d88 RCX: 0000000000000035 RDX: 0000000000000018 RSI: 0000000000000018 RDI: 0000000000000292 RBP: ffffffff810128de R08: ffffffff8168cd30 R09: ffff88096ccd5d80 R10: ffff88096c802d20 R11: 0000000000000001 R12: 000000000e898fff R13: 0000000000000000 R14: 00000000fffffffb R15: ffff88096c802d20 FS: 00007f1ce9f37700(0000) GS:ffff880502400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1ce93d8c60 CR3: 000000096aea6000 CR4: 00000000000006a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: [<ffffffff81068bfe>] ? smp_call_function_many+0x18e/0x220 [<ffffffff810e00b0>] ? invalidate_bh_lru+0x0/0x80 [<ffffffff810e00b0>] ? invalidate_bh_lru+0x0/0x80 [<ffffffff81068cc5>] ? smp_call_function+0x35/0x60 [<ffffffff810456a1>] ? on_each_cpu+0x31/0x80 [<ffffffff810de767>] ? invalidate_bh_lrus+0x17/0x20 [<ffffffff810e5cf5>] ? __blkdev_put+0x195/0x1b0 [<ffffffff81420a29>] ? _spin_unlock+0x9/0x30 [<ffffffff810e61a0>] ? blkdev_close+0x30/0x60 [<ffffffff810ba6dd>] ? __fput+0xdd/0x240 [<ffffffff810ba859>] ? fput+0x19/0x20 [<ffffffff810b7424>] ? filp_close+0x54/0x80 [<ffffffff810c6c90>] ? sys_dup3+0x100/0x1b0 [<ffffffff810c6d53>] ? sys_dup2+0x13/0x90 [<ffffffff810b891a>] ? sys_open+0x1a/0x20 [<ffffffff81011e02>] ? system_call_fastpath+0x16/0x1b Kernel panic - not syncing: softlockup: hung tasks Rebooting in 1 seconds.. thanks.
