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Message-ID: <20120904144813.GC2593@linux.vnet.ibm.com> Date: Tue, 4 Sep 2012 07:48:13 -0700 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: Artem Bityutskiy <dedekind1@...il.com> Cc: Subodh Nijsure <snijsure@...d-net.com>, linux-mtd@...ts.infradead.org, Linux Kernel Maling List <linux-kernel@...r.kernel.org> Subject: Re: RCU warning during UBI file system mount On Tue, Sep 04, 2012 at 10:46:36AM +0300, Artem Bityutskiy wrote: > Let's CC LKML and Paul. > > > On Sat, 2012-09-01 at 22:19 -0700, Subodh Nijsure wrote: > > Hello, > > > > I am running 3.6-rc4 kernel on my MX28 based board and every time I > > mount UBI file system I see following warning. > > Anybody else seen this errors, particularly those running it on MXS > > platform? > > > > I haven't debugged RCU warnings before any clues as to what is the > > source of this warning is, should I be looking at > > start_dma_without_bch_irq() code? Would appreciate any pointers in > > fixing this... RCU is upset because what it believes to be a non-idle task is telling RCU that it is entering the idle loop. Does the MX28 kernel have any unusual idle features? (This is a subarch of ARM, correct?) Thanx, Paul > > [ 4.280000] WARNING: at /opt/git/kernel-mainline/kernel/rcutiny.c:75 > > rcu_idle_enter_common.clone.7+0x90/0xac() > > [ 4.280000] Current pid: 1 comm: swapper / Idle pid: 0 comm: swapper > > [ 4.280000] Modules linked in: > > [ 4.280000] [<c0014eec>] (unwind_backtrace+0x0/0x130) from > > [<c001dd94>] (warn_slowpath_common+0x4c/0x64) > > [ 4.280000] [<c001dd94>] (warn_slowpath_common+0x4c/0x64) from > > [<c001de40>] (warn_slowpath_fmt+0x30/0x40) > > [ 4.280000] [<c001de40>] (warn_slowpath_fmt+0x30/0x40) from > > [<c0061618>] (rcu_idle_enter_common.clone.7+0x90/0xac) > > [ 4.280000] [<c0061618>] (rcu_idle_enter_common.clone.7+0x90/0xac) > > from [<c0061670>] (rcu_irq_exit+0x3c/0x78) > > [ 4.280000] [<c0061670>] (rcu_irq_exit+0x3c/0x78) from [<c000fe90>] > > (handle_IRQ+0x34/0x84) > > [ 4.280000] [<c000fe90>] (handle_IRQ+0x34/0x84) from [<c000ec34>] > > (__irq_svc+0x34/0x58) > > [ 4.280000] [<c000ec34>] (__irq_svc+0x34/0x58) from [<c0394c4c>] > > (schedule_timeout+0xdc/0x16c) > > [ 4.280000] [<c0394c4c>] (schedule_timeout+0xdc/0x16c) from > > [<c0395f34>] (wait_for_common+0xb4/0x160) > > [ 4.280000] [<c0395f34>] (wait_for_common+0xb4/0x160) from > > [<c02579d0>] (start_dma_without_bch_irq+0x6c/0xa8) > > [ 4.280000] [<c02579d0>] (start_dma_without_bch_irq+0x6c/0xa8) from > > [<c0258660>] (gpmi_send_command+0x120/0x154) > > [ 4.280000] [<c0258660>] (gpmi_send_command+0x120/0x154) from > > [<c0256fb4>] (gpmi_cmd_ctrl+0x44/0x6c) > > [ 4.280000] [<c0256fb4>] (gpmi_cmd_ctrl+0x44/0x6c) from [<c024f8e0>] > > (nand_command_lp+0xe8/0x270) > > [ 4.280000] [<c024f8e0>] (nand_command_lp+0xe8/0x270) from > > [<c0251e00>] (nand_do_read_ops+0x124/0x444) > > [ 4.280000] [<c0251e00>] (nand_do_read_ops+0x124/0x444) from > > [<c0252558>] (nand_read+0x54/0x78) > > [ 4.280000] [<c0252558>] (nand_read+0x54/0x78) from [<c02499a4>] > > (part_read+0x48/0x80) > > [ 4.280000] [<c02499a4>] (part_read+0x48/0x80) from [<c0246910>] > > (mtd_read+0x88/0xb4) > > [ 4.280000] [<c0246910>] (mtd_read+0x88/0xb4) from [<c026b188>] > > (ubi_io_read+0xb0/0x3e8) > > [ 4.280000] [<c026b188>] (ubi_io_read+0xb0/0x3e8) from [<c026740c>] > > (ubi_eba_read_leb+0x198/0x4bc) > > [ 4.280000] [<c026740c>] (ubi_eba_read_leb+0x198/0x4bc) from > > [<c0266800>] (ubi_leb_read+0xf4/0x16c) > > [ 4.280000] [<c0266800>] (ubi_leb_read+0xf4/0x16c) from [<c0155550>] > > (ubifs_leb_read+0x24/0x88) > > [ 4.280000] [<c0155550>] (ubifs_leb_read+0x24/0x88) from [<c01572f8>] > > (ubifs_read_node+0xa8/0x2e4) > > [ 4.280000] [<c01572f8>] (ubifs_read_node+0xa8/0x2e4) from > > [<c0153c50>] (ubifs_read_sb_node+0x54/0x78) > > [ 4.280000] [<c0153c50>] (ubifs_read_sb_node+0x54/0x78) from > > [<c0154940>] (ubifs_read_superblock+0xc8c/0x133c) > > [ 4.280000] [<c0154940>] (ubifs_read_superblock+0xc8c/0x133c) from > > [<c01520ac>] (ubifs_mount+0x73c/0x1bc0) > > [ 4.280000] [<c01520ac>] (ubifs_mount+0x73c/0x1bc0) from [<c00a49ec>] > > (mount_fs+0x44/0x184) > > [ 4.280000] [<c00a49ec>] (mount_fs+0x44/0x184) from [<c00baf90>] > > (vfs_kern_mount+0x4c/0xc0) > > [ 4.280000] [<c00baf90>] (vfs_kern_mount+0x4c/0xc0) from [<c00bb1a0>] > > (do_kern_mount+0x34/0xd0) > > [ 4.280000] [<c00bb1a0>] (do_kern_mount+0x34/0xd0) from [<c00bc93c>] > > (do_mount+0x15c/0x73c) > > [ 4.280000] [<c00bc93c>] (do_mount+0x15c/0x73c) from [<c00bcfa0>] > > (sys_mount+0x84/0xc4) > > [ 4.280000] [<c00bcfa0>] (sys_mount+0x84/0xc4) from [<c04e4a04>] > > (do_mount_root+0x24/0xb0) > > [ 4.280000] [<c04e4a04>] (do_mount_root+0x24/0xb0) from [<c04e4b78>] > > (mount_block_root+0xe8/0x214) > > [ 4.280000] [<c04e4b78>] (mount_block_root+0xe8/0x214) from > > [<c04e4e28>] (prepare_namespace+0x8c/0x180) > > [ 4.280000] [<c04e4e28>] (prepare_namespace+0x8c/0x180) from > > [<c04e4894>] (kernel_init+0x16c/0x1b4) > > [ 4.280000] [<c04e4894>] (kernel_init+0x16c/0x1b4) from [<c000ff70>] > > (kernel_thread_exit+0x0/0x8) > > [ 4.280000] ---[ end trace 4d36b722759fdc4f ]--- > > [ 4.950000] UBIFS DBG (pid 58): ubifs_bg_thread: background thread > > "ubifs_bgt0_0" started, PID 58 > > > > -Subodh > > > > ______________________________________________________ > > Linux MTD discussion mailing list > > http://lists.infradead.org/mailman/listinfo/linux-mtd/ > > -- > Best Regards, > Artem Bityutskiy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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