Messages in this thread | | | Date | Sun, 1 Jan 2012 17:22:58 +0000 | Subject | block: WARN_ON_ONCE(ev->block <= 0) triggered in __disk_unblock_events() | From | Bart Van Assche <> |
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Hello,
In a workload that involves a lot of scsi_remove_hosts() calls (srp-ha patch set stress test) I get the call stack below after about 30 to 50 iterations. Is this a known issue ? Does this indicate a race condition in the block layer ? I can trigger this issue not only with 3.2-rc7 but also with 3.1.6. I haven't tried any other kernel versions yet.
Thanks,
Bart.
------------[ cut here ]------------ WARNING: at block/genhd.c:1466 __disk_unblock_events+0xf5/0x110() Hardware name: P5Q DELUXE Modules linked in: ib_srp scsi_transport_srp scsi_tgt snd_pcm_oss snd_mixer_oss snd_seq snd_seq_device af_packet rdma_ucm rdma_cm iw_cm ib_addr ib_ipoib ib_cm ib_sa ib_uverbs ib_umad mlx4_ib ib_mad ib_core microcode cpufreq_conservative cpufreq_userspace cpufreq_powersave acpi_cpufreq mperf dm_mod snd_hda_codec_hdmi snd_hda_codec_analog snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_timer snd sr_mod sg mlx4_core intel_agp cdrom i2c_i801 intel_gtt soundcore agpgart i2c_core pcspkr snd_page_alloc button uhci_hcd sd_mod crc_t10dif ehci_hcd usbcore usb_common edd ext3 mbcache jbd fan ata_generic ata_piix pata_marvell ahci libahci libata scsi_mod thermal processor thermal_sys hwmon Pid: 4133, comm: edd_id Not tainted 3.2.0-rc7+ #1 Call Trace: [<ffffffff8104669f>] warn_slowpath_common+0x7f/0xc0 [<ffffffff810466fa>] warn_slowpath_null+0x1a/0x20 [<ffffffff811e8fd5>] __disk_unblock_events+0xf5/0x110 [<ffffffff811eae5a>] disk_unblock_events+0x1a/0x20 [<ffffffff8117c980>] __blkdev_get+0x1b0/0x430 [<ffffffff8117cfb0>] ? blkdev_get+0x3b0/0x3b0 [<ffffffff8117cc53>] blkdev_get+0x53/0x3b0 [<ffffffff813e8d7b>] ? _raw_spin_unlock+0x2b/0x50 [<ffffffff8117cfb0>] ? blkdev_get+0x3b0/0x3b0 [<ffffffff8117d012>] blkdev_open+0x62/0x80 [<ffffffff81142b22>] __dentry_open+0x212/0x390 [<ffffffff813e8d7b>] ? _raw_spin_unlock+0x2b/0x50 [<ffffffff811cf840>] ? devcgroup_seq_read+0x160/0x160 [<ffffffff81143e01>] nameidata_to_filp+0x71/0x80 [<ffffffff81152966>] do_last+0xb6/0x7e0 [<ffffffff81154578>] path_openat+0xd8/0x420 [<ffffffff8110b9c3>] ? might_fault+0x53/0xb0 [<ffffffff811549e9>] do_filp_open+0x49/0xa0 [<ffffffff813e8d7b>] ? _raw_spin_unlock+0x2b/0x50 [<ffffffff811617c4>] ? alloc_fd+0xf4/0x150 [<ffffffff81143f11>] do_sys_open+0x101/0x1e0 [<ffffffff81144010>] sys_open+0x20/0x30 [<ffffffff813f0e6b>] system_call_fastpath+0x16/0x1b ---[ end trace 1afaff519afd7a94 ]---
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