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Date: Mon, 8 Sep 2008 10:43:12 +0200 From: Jens Axboe <jens.axboe@...cle.com> To: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> Cc: m.kozlowski@...land.pl, rjw@...k.pl, akpm@...ux-foundation.org, bzolnier@...il.com, linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org, linux-ide@...r.kernel.org Subject: Re: 2.6.27-rc5-mm1: rmmod ide-cd_mod: tried to init an initialized object, something is seriously wrong. On Sat, Sep 06 2008, FUJITA Tomonori wrote: > On Fri, 5 Sep 2008 18:25:04 +0200 > Mariusz Kozlowski <m.kozlowski@...land.pl> wrote: > > > Hello, > > > > > > > Again 100% reproducible rmmod ide-cd_mod problem. Kernel is tainted because > > > > > of earlier sysfs acpi problems similar (probably identical) to those reported > > > > > by Li Zefan here http://marc.info/?l=linux-kernel&m=121921059026064&w=2 > > > > > > > > > > Steps to reproduce: unload ide-cd_mod > > > > > > > > > > kobject (dd9e4a7c): tried to init an initialized object, something is seriously wrong. > > > > > Pid: 4734, comm: modprobe Tainted: G W 2.6.27-rc5-mm1 #1 > > > > > [<c01ec982>] kobject_init+0xc4/0xc9 > > > > > [<c02cb84a>] ? _spin_unlock+0x27/0x3f > > > > > [<c01aff2e>] ? sysfs_find_dirent+0x21/0x2b > > > > > [<c01aff7e>] ? __sysfs_add_one+0x46/0x6d > > > > > [<c01affb4>] ? sysfs_add_one+0xf/0x44 > > > > > [<c01b0036>] ? sysfs_addrm_start+0x4d/0x90 > > > > > [<c01b0f31>] ? sysfs_do_create_link+0x9a/0x14c > > > > > [<c01ec9c5>] kobject_init_and_add+0x14/0x30 > > > > > [<c01b1009>] ? sysfs_create_link+0x12/0x19 > > > > > [<c01e8bad>] blk_register_filter+0x3b/0x46 > > > > > [<ded9e40a>] ide_cd_probe+0x253/0x5a8 [ide_cd_mod] > > > > > [<c01b0000>] ? sysfs_addrm_start+0x17/0x90 > > > > > [<c01b0f31>] ? sysfs_do_create_link+0x9a/0x14c > > > > > [<c01b004e>] ? sysfs_addrm_start+0x65/0x90 > > > > > [<c025145f>] generic_ide_probe+0x1f/0x21 > > > > > [<c024c002>] driver_probe_device+0x77/0x15b > > > > > [<c02cb91b>] ? _spin_unlock_irqrestore+0x39/0x60 > > > > > [<c024c146>] __driver_attach+0x60/0x62 > > > > > [<c024b7bd>] bus_for_each_dev+0x44/0x62 > > > > > [<c0251461>] ? generic_ide_remove+0x0/0x1e > > > > > [<c024bead>] driver_attach+0x19/0x1b > > > > > [<c024c0e6>] ? __driver_attach+0x0/0x62 > > > > > [<c024bca8>] bus_add_driver+0x1ab/0x213 > > > > > [<c0251461>] ? generic_ide_remove+0x0/0x1e > > > > > [<c024c291>] driver_register+0x4f/0x118 > > > > > [<de7bf000>] ? ide_cdrom_init+0x0/0xf [ide_cd_mod] > > > > > [<de7bf00d>] ide_cdrom_init+0xd/0xf [ide_cd_mod] > > > > > [<c0101114>] do_one_initcall+0x24/0x12f > > > > > [<c02c9d8e>] ? mutex_unlock+0x8/0xa > > > > > [<c01455ca>] sys_init_module+0xa5/0x1c1 > > > > > [<c0176a0a>] ? sys_read+0x3d/0x64 > > > > > [<c01030f1>] sysenter_do_call+0x12/0x35 > > > > > [<c012007b>] ? __set_special_pids+0x43/0x71 > > > > > > > > > > First time I modprobe/rmmod ide-cd_mod the system works but quickly gets unstable. > > > > > Second modprobe/rmmod is 100% fatal. Memory gets corruped seriously I guess. > > > > > pcspeaker beeps all the time, kernel throws dumps on the screen until > > > > > its really dead, sadly blinking 'leds of panic' ;) > > > > > > > > Can you please verify if that happens with the current mainline? > > > > > > Oops. How come I didn't find it earlier? hmm... > > > > It's relatively new, that's why :) And this is the culprit: > > > > abf5439370491dd6fbb4fe1a7939680d2a9bc9d4 is first bad commit > > commit abf5439370491dd6fbb4fe1a7939680d2a9bc9d4 > > Author: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> > > Date: Sat Aug 16 14:10:05 2008 +0900 > > > > block: move cmdfilter from gendisk to request_queue > > > > cmd_filter works only for the block layer SG_IO with SCSI block > > devices. It breaks scsi/sg.c, bsg, and the block layer SG_IO with SCSI > > character devices (such as st). We hit a kernel crash with them. > > > > The problem is that cmd_filter code accesses to gendisk (having struct > > blk_scsi_cmd_filter) via inode->i_bdev->bd_disk. It works for only > > SCSI block device files. With character device files, inode->i_bdev > > leads you to struct cdev. inode->i_bdev->bd_disk->blk_scsi_cmd_filter > > isn't safe. > > > > SCSI ULDs don't expose gendisk; they keep it private. bsg needs to be > > independent on any protocols. We shouldn't change ULDs to expose their > > gendisk. > > > > This patch moves struct blk_scsi_cmd_filter from gendisk to > > request_queue, a common object, which eveyone can access to. > > > > The user interface doesn't change; users can change the filters via > > /sys/block/. gendisk has a pointer to request_queue so the cmd_filter > > code accesses to struct blk_scsi_cmd_filter. > > > > Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> > > Signed-off-by: Jens Axboe <jens.axboe@...cle.com> > > > > > This is current mainline: > > > > > > kobject (ddb049fc): tried to init an initialized object, something is seriously wrong. > > > Pid: 4650, comm: modprobe Not tainted 2.6.27-rc5-00132-gb380b0d #8 > > > [<c01e3196>] kobject_init+0x6a/0x6c > > > [<c01e35cb>] kobject_init_and_add+0x14/0x30 > > > [<c01e32f7>] ? kobject_get+0x12/0x17 > > > [<c01df89c>] blk_register_filter+0x4b/0x5a > > > [<de839310>] ide_cd_probe+0x289/0x5ae [ide_cd_mod] > > > [<c01aad99>] ? sysfs_addrm_start+0x65/0x90 > > > [<c01aba69>] ? sysfs_do_create_link+0x9a/0x11c > > > [<c024f7a0>] generic_ide_probe+0x1f/0x21 > > > [<c024a672>] driver_probe_device+0x77/0x15b > > > [<c02c8bdb>] ? _spin_unlock_irqrestore+0x39/0x60 > > > [<c024a7b6>] __driver_attach+0x60/0x62 > > > [<c0249e2a>] bus_for_each_dev+0x44/0x62 > > > [<c024f7a2>] ? generic_ide_remove+0x0/0x1e > > > [<c024a51d>] driver_attach+0x19/0x1b > > > [<c024a756>] ? __driver_attach+0x0/0x62 > > > [<c024a318>] bus_add_driver+0x1ae/0x216 > > > [<c024f7a2>] ? generic_ide_remove+0x0/0x1e > > > [<c024a901>] driver_register+0x4f/0x118 > > > [<dee3500d>] ide_cdrom_init+0xd/0xf [ide_cd_mod] > > > [<c010111a>] do_one_initcall+0x2a/0x14c > > > [<c0108560>] ? native_sched_clock+0x58/0xa1 > > > [<dee35000>] ? ide_cdrom_init+0x0/0xf [ide_cd_mod] > > > [<c013d042>] ? trace_hardirqs_on+0xb/0xd > > > [<c013cfaf>] ? trace_hardirqs_on_caller+0xac/0x134 > > > [<c0147083>] sys_init_module+0x7e/0x19f > > > [<c013cfaf>] ? trace_hardirqs_on_caller+0xac/0x134 > > > [<c01e8144>] ? trace_hardirqs_on_thunk+0xc/0x10 > > > [<c0103035>] sysenter_do_call+0x12/0x35 > > > [<c012007b>] ? put_fs_struct+0x5/0x2e > > ide-cd uses multiple gendisks share one request_queue? > > Here's a patch for mainline. Hmm, I don't think that it does. There's a queue per drive in the old IDE driver, so there should be a 1:1 relation between queues and gendisk there. > > = > From: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> > Subject: [PATCH] ide: remove cmd filter support in ide-cd > > Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> > --- > drivers/ide/ide-cd.c | 2 -- > 1 files changed, 0 insertions(+), 2 deletions(-) > > diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c > index f148999..49a8c58 100644 > --- a/drivers/ide/ide-cd.c > +++ b/drivers/ide/ide-cd.c > @@ -1933,7 +1933,6 @@ static void ide_cd_remove(ide_drive_t *drive) > > ide_proc_unregister_driver(drive, info->driver); > > - blk_unregister_filter(info->disk); > del_gendisk(info->disk); > > ide_cd_put(info); > @@ -2159,7 +2158,6 @@ static int ide_cd_probe(ide_drive_t *drive) > g->fops = &idecd_ops; > g->flags |= GENHD_FL_REMOVABLE; > add_disk(g); > - blk_register_filter(g); > return 0; > > out_free_cd: > -- > 1.5.4.2 > -- Jens Axboe -- 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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