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Date: Fri, 28 Oct 2011 15:47:43 +0200 From: Matthijs Kooijman <matthijs@...in.nl> To: Tejun Heo <tj@...nel.org> Cc: Gaudenz Steinlin <gaudenz@...ian.org>, linux-kernel@...r.kernel.org, Jameson Graef Rollins <jrollins@...estructure.net>, Jonathan Nieder <jrnieder@...il.com>, Jens Axboe <axboe@...nel.dk>, Amit Shah <amit.shah@...hat.com>, David Zeuthen <zeuthen@...il.com>, Martin Pitt <martin.pitt@...ntu.com> Subject: Re: [regression] CD-ROM polling blocks suspend on some machines (Re: [PATCH 1/2] cdrom: always check_disk_change() on open) Hi Tejun, > > it seems this same problem also occurs with udisks-daemon, though the > > behaviour is slightly different (it seems to hang even before > > undocking, I _think_). > > > > Anyway, here's the dmesg output when trying to suspend: > > Can you please turn on CONFIG_FRAME_POINTER, trigger the problem, wait > for some minutes and then do sysrq-t and report the dmesg output? > This could be from DEAD state handling race currently being addressed > in upstream. I compiled a clean 3.1.0 kernel with FRAME_POINTER support, but haven't been able to reproduce the problem with udisks-daemon so far. It actually seems the problem occurs less often with 3.1.0, I initially thought the problem was fixed. I'm not sure if the FRAME_POINTER option actually works, though, since I couldn't find any obvious differences in the format of the stack traces? I have managed to trigger the problem again in scsi_id (by undocking) and then suspending. I've attached the full output of sysrq-t (though I think it's incomplete, syslogd didn't manage to capture it all?). The part about scsi_id is copied below. Here's the dmesg output during the suspend: Oct 28 15:15:55 grubby kernel: [ 168.864019] Freezing of tasks failed after 20.01 seconds (1 tasks refusing to freeze, wq_busy=0): Oct 28 15:15:55 grubby kernel: [ 168.864069] scsi_id D 0000000000000000 0 11343 8992 0x00800004 Oct 28 15:15:55 grubby kernel: [ 168.864077] ffff880225e6f8d8 0000000000000082 00ff880200000000 ffff880200000000 Oct 28 15:15:55 grubby kernel: [ 168.864085] ffff88022d7ed610 ffff880225e6ffd8 ffff880225e6ffd8 0000000000012f40 Oct 28 15:15:55 grubby kernel: [ 168.864095] ffff88022ed59610 ffff88022d7ed610 ffff88020439e440 0000000100000002 Oct 28 15:15:55 grubby kernel: [ 168.864098] Call Trace: Oct 28 15:15:55 grubby kernel: [ 168.864107] [<ffffffff8134c996>] schedule+0x55/0x57 Oct 28 15:15:55 grubby kernel: [ 168.864110] [<ffffffff8134cc2c>] schedule_timeout+0x2f/0xd9 Oct 28 15:15:55 grubby kernel: [ 168.864117] [<ffffffff8104302a>] ? __cond_resched+0x23/0x2f Oct 28 15:15:55 grubby kernel: [ 168.864120] [<ffffffff8134c832>] wait_for_common+0x9e/0x115 Oct 28 15:15:55 grubby kernel: [ 168.864122] [<ffffffff8104075b>] ? try_to_wake_up+0x1a7/0x1a7 Oct 28 15:15:55 grubby kernel: [ 168.864125] [<ffffffff8134c93f>] wait_for_completion+0x18/0x1a Oct 28 15:15:55 grubby kernel: [ 168.864130] [<ffffffff8105d659>] flush_work+0x29/0x2f Oct 28 15:15:55 grubby kernel: [ 168.864133] [<ffffffff8105c8ff>] ? do_work_for_cpu+0x24/0x24 Oct 28 15:15:55 grubby kernel: [ 168.864136] [<ffffffff8105d9e5>] flush_delayed_work+0x3a/0x3e Oct 28 15:15:55 grubby kernel: [ 168.864142] [<ffffffff811a0156>] disk_clear_events+0x8f/0xf5 Oct 28 15:15:55 grubby kernel: [ 168.864169] [<ffffffff81125280>] check_disk_change+0x29/0x5c Oct 28 15:15:55 grubby kernel: [ 168.864176] [<ffffffffa009feb1>] cdrom_open+0x44/0x4b2 [cdrom] Oct 28 15:15:55 grubby kernel: [ 168.864181] [<ffffffff811aba78>] ? kobject_get+0x18/0x20 Oct 28 15:15:55 grubby kernel: [ 168.864186] [<ffffffff8124a895>] ? get_device+0x14/0x1a Oct 28 15:15:55 grubby kernel: [ 168.864191] [<ffffffffa00bb86b>] sr_block_open+0x90/0xb7 [sr_mod] Oct 28 15:15:55 grubby kernel: [ 168.864194] [<ffffffff8112610b>] __blkdev_get+0xe2/0x398 Oct 28 15:15:55 grubby kernel: [ 168.864197] [<ffffffff8112667c>] ? blkdev_get+0x2bb/0x2bb Oct 28 15:15:55 grubby kernel: [ 168.864199] [<ffffffff8112658d>] blkdev_get+0x1cc/0x2bb Oct 28 15:15:55 grubby kernel: [ 168.864201] [<ffffffff8112667c>] ? blkdev_get+0x2bb/0x2bb Oct 28 15:15:55 grubby kernel: [ 168.864203] [<ffffffff811266de>] blkdev_open+0x62/0x66 Oct 28 15:15:55 grubby kernel: [ 168.864209] [<ffffffff810fbf12>] __dentry_open+0x182/0x299 Oct 28 15:15:55 grubby kernel: [ 168.864212] [<ffffffff8134db64>] ? _raw_spin_lock+0x9/0xb Oct 28 15:15:55 grubby kernel: [ 168.864215] [<ffffffff810fcde9>] nameidata_to_filp+0x5b/0x62 Oct 28 15:15:55 grubby kernel: [ 168.864219] [<ffffffff81108e4a>] do_last+0x454/0x56c Oct 28 15:15:55 grubby kernel: [ 168.864221] [<ffffffff8110905a>] path_openat+0xca/0x30b Oct 28 15:15:55 grubby kernel: [ 168.864226] [<ffffffff810d4744>] ? handle_mm_fault+0x1c3/0x1d6 Oct 28 15:15:55 grubby kernel: [ 168.864228] [<ffffffff811092e9>] do_filp_open+0x33/0x81 Oct 28 15:15:55 grubby kernel: [ 168.864233] [<ffffffff81112584>] ? alloc_fd+0x6d/0x118 Oct 28 15:15:55 grubby kernel: [ 168.864235] [<ffffffff810fce59>] do_sys_open+0x69/0xfb Oct 28 15:15:55 grubby kernel: [ 168.864238] [<ffffffff810fcf06>] sys_open+0x1b/0x1d Oct 28 15:15:55 grubby kernel: [ 168.864241] [<ffffffff81352ed2>] system_call_fastpath+0x16/0x1b Oct 28 15:15:55 grubby kernel: [ 168.864244] Here's the sysrq-t output about scsi_id from a few minutes after the suspend: Oct 28 15:29:00 grubby kernel: [ 951.018877] scsi_id D 0000000000000000 0 11343 8992 0x00000004 Oct 28 15:29:00 grubby kernel: [ 951.018882] ffff880225e6f8d8 0000000000000082 00ff880200000000 ffff880200000000 Oct 28 15:29:00 grubby kernel: [ 951.018889] ffff88022d7ed610 ffff880225e6ffd8 ffff880225e6ffd8 0000000000012f40 Oct 28 15:29:00 grubby kernel: [ 951.018896] ffff88022ed59610 ffff88022d7ed610 ffff88020439e440 0000000100000002 Oct 28 15:29:00 grubby kernel: [ 951.018903] Call Trace: Oct 28 15:29:00 grubby kernel: [ 951.018908] [<ffffffff8134c996>] schedule+0x55/0x57 Oct 28 15:29:00 grubby kernel: [ 951.018913] [<ffffffff8134cc2c>] schedule_timeout+0x2f/0xd9 Oct 28 15:29:00 grubby kernel: [ 951.018919] [<ffffffff8104302a>] ? __cond_resched+0x23/0x2f Oct 28 15:29:00 grubby kernel: [ 951.018925] [<ffffffff8134c832>] wait_for_common+0x9e/0x115 Oct 28 15:29:00 grubby kernel: [ 951.018930] [<ffffffff8104075b>] ? try_to_wake_up+0x1a7/0x1a7 Oct 28 15:29:00 grubby kernel: [ 951.018936] [<ffffffff8134c93f>] wait_for_completion+0x18/0x1a Oct 28 15:29:00 grubby kernel: [ 951.018942] [<ffffffff8105d659>] flush_work+0x29/0x2f Oct 28 15:29:00 grubby kernel: [ 951.018947] [<ffffffff8105c8ff>] ? do_work_for_cpu+0x24/0x24 Oct 28 15:29:00 grubby kernel: [ 951.018953] [<ffffffff8105d9e5>] flush_delayed_work+0x3a/0x3e Oct 28 15:29:00 grubby kernel: [ 951.018959] [<ffffffff811a0156>] disk_clear_events+0x8f/0xf5 Oct 28 15:29:00 grubby kernel: [ 951.018970] [<ffffffff81125280>] check_disk_change+0x29/0x5c Oct 28 15:29:00 grubby kernel: [ 951.018982] [<ffffffffa009feb1>] cdrom_open+0x44/0x4b2 [cdrom] Oct 28 15:29:00 grubby kernel: [ 951.018988] [<ffffffff811aba78>] ? kobject_get+0x18/0x20 Oct 28 15:29:00 grubby kernel: [ 951.018994] [<ffffffff8124a895>] ? get_device+0x14/0x1a Oct 28 15:29:00 grubby kernel: [ 951.019005] [<ffffffffa00bb86b>] sr_block_open+0x90/0xb7 [sr_mod] Oct 28 15:29:00 grubby kernel: [ 951.019011] [<ffffffff8112610b>] __blkdev_get+0xe2/0x398 Oct 28 15:29:00 grubby kernel: [ 951.019016] [<ffffffff8112667c>] ? blkdev_get+0x2bb/0x2bb Oct 28 15:29:00 grubby kernel: [ 951.019021] [<ffffffff8112658d>] blkdev_get+0x1cc/0x2bb Oct 28 15:29:00 grubby kernel: [ 951.019026] [<ffffffff8112667c>] ? blkdev_get+0x2bb/0x2bb Oct 28 15:29:00 grubby kernel: [ 951.019031] [<ffffffff811266de>] blkdev_open+0x62/0x66 Oct 28 15:29:00 grubby kernel: [ 951.019036] [<ffffffff810fbf12>] __dentry_open+0x182/0x299 Oct 28 15:29:00 grubby kernel: [ 951.019042] [<ffffffff8134db64>] ? _raw_spin_lock+0x9/0xb Oct 28 15:29:00 grubby kernel: [ 951.019048] [<ffffffff810fcde9>] nameidata_to_filp+0x5b/0x62 Oct 28 15:29:00 grubby kernel: [ 951.019054] [<ffffffff81108e4a>] do_last+0x454/0x56c Oct 28 15:29:00 grubby kernel: [ 951.019060] [<ffffffff8110905a>] path_openat+0xca/0x30b Oct 28 15:29:00 grubby kernel: [ 951.019066] [<ffffffff810d4744>] ? handle_mm_fault+0x1c3/0x1d6 Oct 28 15:29:00 grubby kernel: [ 951.019072] [<ffffffff811092e9>] do_filp_open+0x33/0x81 Oct 28 15:29:00 grubby kernel: [ 951.019078] [<ffffffff81112584>] ? alloc_fd+0x6d/0x118 Oct 28 15:29:00 grubby kernel: [ 951.019084] [<ffffffff810fce59>] do_sys_open+0x69/0xfb Oct 28 15:29:00 grubby kernel: [ 951.019089] [<ffffffff810fcf06>] sys_open+0x1b/0x1d Oct 28 15:29:00 grubby kernel: [ 951.019095] [<ffffffff81352ed2>] system_call_fastpath+0x16/0x1b It seems these two traces are identical. There are a number of "INFO: task scsi_id:11343 blocked for more than 120 seconds" traces in the log as well, which also look identical. I hope this helps... If you need anything more, just ask. Gr. Matthijs View attachment "sysreq-t.txt" of type "text/plain" (185200 bytes) Download attachment "signature.asc" of type "application/pgp-signature" (198 bytes)
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