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    SubjectRe: RCU warning during UBI file system mount
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    Date
    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...
    >
    > [ 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
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