On 2014-04-20 14:30, Jet Chen wrote:
Hi Zhiguo,I got the below dmesg and the first bad commit is git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master commit 2c575026fae6e63771bd2a4c1d407214a8096a89 Author: Hong Zhiguo <zhiguoh...@tencent.com> AuthorDate: Wed Nov 20 10:35:05 2013 -0700 Commit: Jens Axboe <ax...@kernel.dk> CommitDate: Wed Nov 20 15:33:04 2013 -0700 Update of blkg_stat and blkg_rwstat may happen in bh context. While u64_stats_fetch_retry is only preempt_disable on 32bit UP system. This is not enough to avoid preemption by bh and may read strange 64 bit value. Signed-off-by: Hong Zhiguo <zhiguoh...@tencent.com> Acked-by: Tejun Heo <t...@kernel.org> Cc: sta...@kernel.org Signed-off-by: Jens Axboe <ax...@kernel.dk> +-----------------------------------------------------------+------------+------------+ | | 82023bb7f7 | 2c575026fa | +-----------------------------------------------------------+------------+------------+ | boot_successes | 47 | 0 | | boot_failures | 13 | 20 | | BUG:kernel_boot_hang | 13 | 5 | | inconsistent_IN-SOFTIRQ-W-SOFTIRQ-ON-W_usage | 0 | 15 | | backtrace:smpboot_thread_fn | 0 | 15 | | backtrace:vfs_read | 0 | 9 | | backtrace:SyS_read | 0 | 9 | | WARNING:CPU:PID:at_kernel/softirq.c:_local_bh_enable_ip() | 0 | 7 | | BUG:spinlock_lockup_suspected_on_CPU | 0 | 1 | | backtrace:do_mount | 0 | 6 | | backtrace:SyS_mount | 0 | 6 | | backtrace:async_run_entry_fn | 0 | 0 | +-----------------------------------------------------------+------------+------------+ [ 12.318816] WARNING: CPU: 0 PID: 300 at kernel/softirq.c:156 _local_bh_enable_ip+0x34/0x97()
Does this still happen with 3.15-rc2? -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
