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Message-ID: <CANq1E4Tb1Er+O54rN3OteMXqeXAXDr4Z-dvY+RQxZW_NdAfifw@mail.gmail.com> Date: Tue, 31 Jul 2012 09:26:07 +0200 From: David Herrmann <dh.herrmann@...glemail.com> To: Bruno Prémont <bonbons@...ux-vserver.org> Cc: linux-input@...r.kernel.org, linux-kernel@...r.kernel.org, Jiri Kosina <jkosina@...e.cz>, Jaya Kumar <jayalk@...works.biz>, linux-fbdev@...r.kernel.org Subject: Re: [PATCH 0/7] HID: picoLCD updates Hi Bruno On Mon, Jul 30, 2012 at 9:36 PM, Bruno Prémont <bonbons@...ux-vserver.org> wrote: > Hi, > > This series updates picoLCD driver: > - split the driver functions into separate files which get included > depending on Kconfig selection > (implementation for CIR using RC_CORE will follow later) > - drop private framebuffer refcounting in favor of refcounting added > to fb_info some time ago > - fix various bugs issues > - disabled firmware version checking in probe() as it does not work > anymore since commit 4ea5454203d991ec85264f64f89ca8855fce69b0 > [HID: Fix race condition between driver core and ll-driver] > > Note: I still get weird behavior on quick unbind/bind sequences > issued via sysfs (CONFIG_SMP=n system) that are triggered by framebuffer > support and apparently more specifically fb_defio part of it. > > Unfortunately I'm out of ideas as to how to track down the problem which > shows either as SLAB corruption (detected with SLUB debugging, e.g. > > [ 6383.521833] ============================================================================= > [ 6383.530020] BUG kmalloc-64 (Not tainted): Object already free > [ 6383.530020] ----------------------------------------------------------------------------- > [ 6383.530020] > [ 6383.530020] INFO: Slab 0xdde0ea20 objects=51 used=40 fp=0xcef516e0 flags=0x40000080 > [ 6383.530020] INFO: Object 0xcef51190 @offset=400 fp=0xcef51f50 > [ 6383.530020] > [ 6383.530020] Bytes b4 cef51180: cc cc cc cc d0 12 f5 ce 5a 5a 5a 5a 5a 5a 5a 5a ........ZZZZZZZZ > [ 6383.530020] Object cef51190: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 6383.530020] Object cef511a0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 6383.530020] Object cef511b0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk > [ 6383.530020] Object cef511c0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b a5 kkkkkkkkkkkkkkk. > [ 6383.530020] Redzone cef511d0: bb bb bb bb .... > [ 6383.530020] Padding cef511d8: 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZ > [ 6383.530020] Pid: 1922, comm: bash Not tainted 3.5.0-jupiter-00003-g8d858b1-dirty #2 > [ 6383.530020] Call Trace: > [ 6383.530020] [<c10bd3cc>] print_trailer+0x11c/0x130 > [ 6383.530020] [<c10bd415>] object_err+0x35/0x40 > [ 6383.530020] [<c10be809>] free_debug_processing+0x99/0x200 > [ 6383.530020] [<c10bf77e>] __slab_free+0x2e/0x280 > [ 6383.530020] [<c1322284>] ? hid_submit_out+0xa4/0x120 > [ 6383.530020] [<c1322870>] ? __usbhid_submit_report+0xc0/0x3c0 > [ 6383.530020] [<c10bfbda>] ? kfree+0xfa/0x110 > [ 6383.530020] [<de932aa4>] ? picolcd_debug_out_report+0x8c4/0x8e0 [hid_picolcd] > [ 6383.530020] [<c10bfbda>] kfree+0xfa/0x110 > [ 6383.530020] [<c1322284>] ? hid_submit_out+0xa4/0x120 > [ 6383.530020] [<c1322284>] ? hid_submit_out+0xa4/0x120 > [ 6383.530020] [<c1322284>] ? hid_submit_out+0xa4/0x120 > [ 6383.530020] [<c1322284>] hid_submit_out+0xa4/0x120 > [ 6383.530020] [<c1322908>] __usbhid_submit_report+0x158/0x3c0 > [ 6383.530020] [<c1322c2b>] usbhid_submit_report+0x1b/0x30 > [ 6383.530020] [<de930789>] picolcd_fb_reset+0xb9/0x180 [hid_picolcd] > [ 6383.530020] [<de930f1d>] picolcd_init_framebuffer+0x20d/0x2e0 [hid_picolcd] > [ 6383.530020] [<de92fb9c>] picolcd_probe+0x3cc/0x580 [hid_picolcd] > [ 6383.530020] [<c1319147>] hid_device_probe+0x67/0xf0 > [ 6383.530020] [<c1282f97>] ? driver_sysfs_add+0x57/0x80 > [ 6383.530020] [<c128329d>] driver_probe_device+0xbd/0x1c0 > [ 6383.530020] [<c1318a1b>] ? hid_match_device+0x7b/0x90 > [ 6383.530020] [<c12821e5>] driver_bind+0x75/0xd0 > [ 6383.530020] [<c1282170>] ? driver_unbind+0x90/0x90 > [ 6383.530020] [<c12818b7>] drv_attr_store+0x27/0x30 > [ 6383.530020] [<c1114aec>] sysfs_write_file+0xac/0xf0 > [ 6383.530020] [<c10c794c>] vfs_write+0x9c/0x130 > [ 6383.530020] [<c10d4a1f>] ? sys_dup3+0x11f/0x160 > [ 6383.530020] [<c1114a40>] ? sysfs_poll+0x90/0x90 > [ 6383.530020] [<c10c7bbd>] sys_write+0x3d/0x70 > [ 6383.530020] [<c13f2557>] sysenter_do_call+0x12/0x26 > [ 6383.530020] FIX kmalloc-64: Object at 0xcef51190 not freed > > or worse spontaneous reboot of the system without any trace on netconsole or > serial console. > > echo $devid > bind; echo $devid > unbind > or > echo $devid > bind; echo $devid > unbind; sleep 0.2; echo $devid > bind; echo $devid > unbind > > is sufficient to trigger the above issue while waiting a few seconds between bind and unbind > shows no sign of trouble. > > Suggestions as to how to debug this and fix it are welcome! This is not directly related to this patchset, but did you fix the locking issue with hid-core? It is still on my todo-list but I haven't gotten around fixing it, yet. However, I plan on fixing it this summer, but if picolcd does not require it, it's probably not worth the work. Regards David -- 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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