On Tue, 08 May 2007 00:30:31 +0100 Simon Arlott <[EMAIL PROTECTED]> wrote:
> On 08/05/07 00:23, Andrew Morton wrote: > > On Mon, 07 May 2007 23:58:36 +0100 > > Simon Arlott <[EMAIL PROTECTED]> wrote: > > > >> I've just got this under mainline too now > >> (0ec54aa8af5e6faa346aa55a1ad15ee6c25bb42d 2007-05-05 22:08:06): > >> > >> [84567.084000] BUG: scheduling while atomic: pdflush/0xeff84acf/186 > >> [84567.084000] INFO: lockdep is turned off. > >> [84567.084000] do_IRQ: stack overflow: 440 > >> [84567.084000] [<b0104f3a>] show_trace_log_lvl+0x1a/0x30 > >> [84567.084000] [<b0104f62>] show_trace+0x12/0x20 > >> [84567.084000] [<b0105075>] dump_stack+0x15/0x20 > >> [84567.084000] [<b01069a8>] do_IRQ+0xd8/0xe0 > >> [84567.084000] [<b0104bd6>] common_interrupt+0x2e/0x34 > >> [84567.084000] [<b0120a28>] printk+0x18/0x20 > >> [84567.084000] [<b0140b33>] debug_show_held_locks+0x23/0x30 > >> [84567.084000] [<b04e7fea>] schedule+0x52a/0x680 > >> [84567.084000] [<b04e8a0a>] schedule_timeout+0x8a/0x90 > >> [84567.084000] [<b026c61e>] xlog_state_sync+0x21e/0x260 > >> [84567.084000] [<b0269274>] _xfs_log_force+0x44/0x70 > >> [84567.084000] [<b022dd22>] xfs_alloc_search_busy+0xd2/0xe0 > >> [84567.084000] [<b022d1e6>] xfs_alloc_get_freelist+0xe6/0x100 > >> [84567.084000] [<b022fb7f>] xfs_alloc_split+0x1f/0x4c0 > >> [84567.084000] [<b022ec3d>] xfs_alloc_insrec+0x35d/0x3b0 > >> [84567.084000] [<b02304f9>] xfs_alloc_insert+0x59/0xd0 > >> [84567.084000] [<b022c847>] xfs_free_ag_extent+0x297/0x640 > >> [84567.084000] [<b022ce11>] xfs_alloc_fix_freelist+0x1d1/0x4c0 > >> [84567.084000] [<b022d73b>] xfs_alloc_vextent+0x1eb/0x4b0 > >> [84567.084000] [<b023d4bb>] xfs_bmap_btalloc+0x3bb/0x8f0 > >> [84567.084000] [<b023da11>] xfs_bmap_alloc+0x21/0x40 > >> [84567.084000] [<b02411bf>] xfs_bmapi+0xdbf/0x1450 > >> [84567.084000] [<b0266b4a>] xfs_iomap_write_allocate+0x2ba/0x520 > >> [84567.084000] [<b026587b>] xfs_iomap+0x45b/0x470 > >> [84567.084000] [<b028d85c>] xfs_bmap+0x2c/0x40 > >> [84567.084000] [<b0284a0c>] xfs_map_blocks+0x3c/0x80 > >> [84567.084000] [<b0285953>] xfs_page_state_convert+0x2f3/0x670 > >> [84567.084000] [<b0285d2a>] xfs_vm_writepage+0x5a/0xf0 > >> [84567.084000] [<b01539a6>] generic_writepages+0x226/0x360 > >> [84567.084000] [<b0285de4>] xfs_vm_writepages+0x24/0x60 > >> [84567.084000] [<b0153b0c>] do_writepages+0x2c/0x50 > >> [84567.084000] [<b01887d9>] __sync_single_inode+0x59/0x1f0 > >> [84567.084000] [<b01889b4>] __writeback_single_inode+0x44/0x1d0 > >> [84567.084000] [<b0188d09>] sync_sb_inodes+0x1c9/0x2e0 > >> [84567.084000] [<b0188eee>] writeback_inodes+0xce/0xe0 > >> [84567.084000] [<b01535c3>] wb_kupdate+0x73/0xf0 > >> [84567.084000] [<b015419e>] __pdflush+0xce/0x1a0 > >> [84567.084000] [<b0154295>] pdflush+0x25/0x30 > >> [84567.084000] [<b01342b4>] kthread+0x94/0xd0 > >> [84567.084000] [<b0104d7b>] kernel_thread_helper+0x7/0x1c > >> [84567.084000] ======================= > >> [84567.087000] [<b0104f3a>] show_trace_log_lvl+0x1a/0x30 > >> [84567.087000] [<b0104f62>] do_IRQ: stack overflow: 328 > >> [84567.087000] [<b0104f3a>] show_trace_log_lvl+0x1a/0x30 > >> [84567.087000] [<b0104f62>] show_trace+0x12/0x20 > >> [84567.087000] [<b0105075>] dump_stack+0x15/0x20 > >> [84567.087000] [<b01069a8>] do_IRQ+0xd8/0xe0 > >> [84567.087000] [<b0104bd6>] common_interrupt+0x2e/0x34 > >> [84567.087000] [<b0120a28>] printk+0x18/0x20 > >> [84567.087000] [<b0104f0d>] print_trace_address+0x1d/0x30 > >> [84567.087000] [<b0104e18>] dump_trace+0x48/0xb0 > >> [84567.087000] [<b0104f3a>] show_trace_log_lvl+0x1a/0x30 > >> [84567.087000] [<b0104f62>] show_trace+0x12/0x20 > >> [84567.087000] [<b0105075>] dump_stack+0x15/0x20 > >> [84567.087000] [<b04e7ffa>] schedule+0x53a/0x680 > >> [84567.087000] [<b04e8a0a>] schedule_timeout+0x8a/0x90 > >> [84567.087000] [<b026c61e>] xlog_state_sync+0x21e/0x260 > >> [84567.087000] [<b0269274>] _xfs_log_force+0x44/0x70 > >> [84567.087000] [<b022dd22>] xfs_alloc_search_busy+0xd2/0xe0 > >> [84567.087000] [<b022d1e6>] xfs_alloc_get_freelist+0xe6/0x100 > >> [84567.087000] [<b022fb7f>] xfs_alloc_split+0x1f/0x4c0 > >> [84567.087000] [<b022ec3d>] xfs_alloc_insrec+0x35d/0x3b0 > >> [84567.087000] [<b02304f9>] xfs_alloc_insert+0x59/0xd0 > >> [84567.087000] [<b022c847>] xfs_free_ag_extent+0x297/0x640 > >> [84567.087000] [<b022ce11>] xfs_alloc_fix_freelist+0x1d1/0x4c0 > >> [84567.087000] [<b022d73b>] xfs_alloc_vextent+0x1eb/0x4b0 > >> [84567.087000] [<b023d4bb>] xfs_bmap_btalloc+0x3bb/0x8f0 > >> [84567.087000] [<b023da11>] xfs_bmap_alloc+0x21/0x40 > >> [84567.087000] [<b02411bf>] xfs_bmapi+0xdbf/0x1450 > >> [84567.087000] [<b0266b4a>] xfs_iomap_write_allocate+0x2ba/0x520 > >> [84567.087000] [<b026587b>] xfs_iomap+0x45b/0x470 > >> [84567.087000] [<b028d85c>] xfs_bmap+0x2c/0x40 > >> [84567.087000] [<b0284a0c>] xfs_map_blocks+0x3c/0x80 > >> [84567.087000] [<b0285953>] xfs_page_state_convert+0x2f3/0x670 > >> [84567.087000] [<b0285d2a>] xfs_vm_writepage+0x5a/0xf0 > >> [84567.087000] [<b01539a6>] generic_writepages+0x226/0x360 > >> [84567.087000] [<b0285de4>] xfs_vm_writepages+0x24/0x60 > >> [84567.087000] [<b0153b0c>] do_writepages+0x2c/0x50 > >> [84567.087000] [<b01887d9>] __sync_single_inode+0x59/0x1f0 > >> [84567.087000] [<b01889b4>] __writeback_single_inode+0x44/0x1d0 > >> [84567.087000] [<b0188d09>] sync_sb_inodes+0x1c9/0x2e0 > >> [84567.087000] [<b0188eee>] writeback_inodes+0xce/0xe0 > >> [84567.087000] [<b01535c3>] wb_kupdate+0x73/0xf0 > >> [84567.087000] [<b015419e>] __pdflush+0xce/0x1a0 > >> [84567.087000] [<b0154295>] pdflush+0x25/0x30 > >> [84567.087000] [<b01342b4>] kthread+0x94/0xd0 > >> [84567.087000] [<b0104d7b>] kernel_thread_helper+0x7/0x1c > >> [84567.087000] BUG: unable to handle kernel paging request at virtual > >> address 00008034 > >> [84567.087000] printing eip: > >> [84567.087000] b0104e36 > >> [84567.087000] *pde = 00000000 > >> [84567.087000] Oops: 0000 [#1] > >> [84567.087000] PREEMPT > >> [84567.087000] Modules linked in: drbd mt352 saa7134_dvb dvb_pll > >> video_buf_dvb dvb_core > >> [84567.087000] CPU: 0 > >> [84567.087000] EIP: 0060:[<b0104e36>] Not tainted VLI > >> [84567.087000] EFLAGS: 00010046 (2.6.21-git #197) > >> [84567.087000] EIP is at dump_trace+0x66/0xb0 > >> [84567.087000] eax: 00000000 ebx: b18f6fe0 ecx: b06323ec edx: > >> b05afc71 > >> [84567.087000] esi: 00008000 edi: 00008ffd ebp: b18f6138 esp: > >> b18f6120 > >> [84567.087000] ds: 007b es: 007b fs: 0000 gs: 0000 ss: 0068 > >> [84567.087000] Process pdflush (pid: 186, ti=b18f5000 task=eff84ad0 > >> task.ti=b18f6000) > >> [84567.087000] Stack: b18f6130 b04ea9af 00000001 b05b9937 0000000a > >> b06d656e b18f6158 b0104f3a > >> [84567.087000] b06323ec b05b9937 00000000 b06356a8 b18f6160 > >> b18f622a b18f6168 b0104f62 > >> [84567.087000] b05b9937 b06d656e b18f6178 b0105075 b05afeac > >> b18f6184 b18f61a8 b01069a8 > >> [84567.087000] Call Trace: > >> [84567.087000] BUG: unable to handle kernel NULL pointer dereference at > >> virtual address 00000034 > >> [84567.087000] printing eip: > >> [84567.087000] b0104e36 > >> [84567.087000] *pde = 00000000 > >> [84567.087000] Oops: 0000 [#2] > >> [84567.087000] PREEMPT > >> [84567.087000] Modules linked in: drbd mt352 saa7134_dvb dvb_pll > >> video_buf_dvb dvb_core > >> [84567.087000] CPU: 0 > >> [84567.087000] EIP: 0060:[<b0104e36>] Not tainted VLI > >> [84567.087000] EFLAGS: 00010046 (2.6.21-git #197) > >> [84567.087000] EIP is at dump_trace+0x66/0xb0 > >> [84567.087000] eax: 00000000 ebx: b18f5f60 ecx: b06323ec edx: > >> b05afc71 > >> [84567.087000] esi: 00000000 edi: 00000ffd ebp: b18f5f60 esp: > >> b18f5f48 > >> [84567.087000] ds: 007b es: 007b fs: 0000 gs: 0000 ss: 0068 > >> [84567.087000] Process pdflush (pid: 186, ti=b18f5000 task=eff84ad0 > >> task.ti=b18f6000) > >> [84567.087000] Stack: 5b3e303c 36353438 38302e37 b05afcde 00000018 > >> 00000000 b18f5f80 b0104f3a > >> [84567.087000] b06323ec b05afcde > >> > >> Then it just gave up doing anything sane, presumably because of the stack > >> overflow in do_IRQ: > >> http://redrum.lp0.eu/tmp/100_4037.jpg > >> http://redrum.lp0.eu/tmp/100_4038.jpg > >> > > > > ugly. And you're using 8k stacks? > > 4k stacks, I will try to reproduce it with 8k stacks - which shouldn't be > hard (see below). > > > The way we'll fix this is to wait for someone to do a git-bisect on it. > > Perhaps you can do that? > > It will take a while, I need to boot to a good kernel so unattended DVB-T > recording works > reliably, I'm assuming switching to a different IO scheduler will avoid any > problems for > that (and not using the XFS filesystem...). It happened again not 5 minutes > later when I > continued compiling the kernel after sending that email so reproducing it > should be easy. > Oh, OK, in that case it is perhaps a genuine stack overflow. > esp: b18f6120 That's not good. Please enable 8k stacks before doing any other debugging things, see if that fixes it. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
