fscache scheduling while atomic bugs under 3.4.10-rt18

From: Tvrtko Ursulin
Date: Sat Sep 08 2012 - 14:23:36 EST


I get a lot of those and was wondering if it is a generic fscache issues or in some way related to the RT patchset. Perhaps that the two do not play well together?

Traces typically look like this:

BUG: scheduling while atomic: kworker/u:2/4151/0x00000002
Modules linked in: snd_usb_audio snd_hwdep snd_usbmidi_lib fuse ip6table_filter ip6_tables ebtable_nat ebtables cachefiles ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables bridge stp llc kvm_amd kvm autofs4 dm_crypt joydev usbhid hid snd_ice1712 nfsd snd_ice17xx_ak4xxx bnep snd_ak4xxx_adda snd_cs8427 snd_ac97_codec nfs bluetooth snd_pcm lockd fscache auth_rpcgss snd_page_alloc nfs_acl ac97_bus binfmt_misc sunrpc snd_i2c snd_mpu401_uart snd_seq_midi microcode snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device snd psmouse soundcore ext4 firewire_ohci mbcache r8169 firewire_core jbd2 mii crc_itu_t pata_atiixp fglrx(PO) i2c_piix4 it87 hwmon_vid raid10 raid456 async_pq async_xor xor async_memcpy async_raid6_recov raid6_pq async_tx raid1 linear xfs raid0 ahci libahci
Pid: 4151, comm: kworker/u:2 Tainted: P O 3.4.10-rt18 #1
Call Trace:
[<ffffffff813d8b0f>] __schedule_bug+0x43/0x45
[<ffffffff813ddcda>] __schedule+0x64a/0x680
[<ffffffff813de149>] schedule+0x29/0x80
[<ffffffff813deda7>] rt_spin_lock_slowlock+0x14b/0x1e4
[<ffffffff813df271>] rt_spin_lock+0x21/0x30
[<ffffffff81045520>] __queue_work+0x180/0x330
[<ffffffff8105644a>] ? ttwu_do_activate.constprop.76+0x4a/0x60
[<ffffffff8104571d>] queue_work_on+0x1d/0x30
[<ffffffff8104577e>] queue_work+0x2e/0x50
[<ffffffff81055c9b>] ? migrate_enable+0xcb/0x1b0
[<ffffffffa047aca5>] fscache_enqueue_object+0x65/0xd0 [fscache]
[<ffffffffa047b2d2>] fscache_object_work_func+0x342/0xa20 [fscache]
[<ffffffff81055c9b>] ? migrate_enable+0xcb/0x1b0
[<ffffffffa047af90>] ? fscache_drop_object+0x170/0x170 [fscache]
[<ffffffff81045a87>] process_one_work+0x117/0x3a0
[<ffffffff81045d34>] process_scheduled_works+0x24/0x40
[<ffffffff81046781>] worker_thread+0x271/0x340
[<ffffffff81046510>] ? manage_workers.isra.30+0x230/0x230
[<ffffffff8104bbde>] kthread+0x8e/0xa0
[<ffffffff810546f9>] ? finish_task_switch+0x49/0xf0
[<ffffffff813e1034>] kernel_thread_helper+0x4/0x10
[<ffffffff8104bb50>] ? __init_kthread_worker+0x50/0x50
[<ffffffff813e1030>] ? gs_change+0xb/0xb


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