I hit the following under a reasonable simple aio workload: - reasonably heavy load - lots of threads doing buffered io to random files - one thread submitting O_DIRECT aio to a single file (journal), all sequential (wrapping), 100MB - probably somewhere between 1 and 50 aios outstanding at any point in time. The kernel was v3.2 mainline, plus unrelated btrfs and ceph patches. Is this a known issue? Any other information that would be helpful? sage [26383.806034] BUG: unable to handle kernel NULL pointer dereference at 0000000000000088 [26383.810008] IP: [<ffffffff8109f582>] __lock_acquire+0x62/0x15d0 [26383.810008] PGD 36bb9067 PUD 368a9067 PMD 0 [26383.810008] Oops: 0000 [#1] SMP [26383.850056] CPU 1 [26383.850056] Modules linked in: ufs qnx4 hfsplus hfs minix ntfs vfat msdos fat jfs xfs exportfs reiserfs ceph libceph cryptd aes_x86_64 aes_generic radeon ttm drm_kms_helper drm shpchp i2c_piix4 i2c_algo_bit k8temp psmouse amd64_edac_mod edac_core serio_raw edac_mce_amd lp parport btrfs tg3 sata_svw pata_serverworks floppy zlib_deflate crc32c libcrc32c [last unloaded: rbd] [26383.850056] [26383.850056] Pid: 31861, comm: ceph-osd Not tainted 3.2.0-ceph-00149-geda84b5 #1 Supermicro H8SSL-I2/H8SSL-I2 [26383.850056] RIP: 0010:[<ffffffff8109f582>] [<ffffffff8109f582>] __lock_acquire+0x62/0x15d0 [26383.850056] RSP: 0018:ffff88003b7d3968 EFLAGS: 00010046 [26383.850056] RAX: 0000000000000046 RBX: 0000000000000088 RCX: 0000000000000000 [26383.850056] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000088 [26383.850056] RBP: ffff88003b7d3a38 R08: 0000000000000002 R09: 0000000000000001 [26383.850056] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000002 [26383.850056] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8800e5905e50 [26383.850056] FS: 00007f294006a700(0000) GS:ffff8800edd00000(0000) knlGS:0000000000000000 [26383.850056] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [26383.850056] CR2: 0000000000000088 CR3: 00000000d1eb3000 CR4: 00000000000006e0 [26383.850056] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [26383.850056] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [26383.850056] Process ceph-osd (pid: 31861, threadinfo ffff88003b7d2000, task ffff8800e5905e50) [26383.850056] Stack: [26383.850056] ffff88003b7d39b8 ffffffff8109ee2d ffffffff81605f70 0000000000000003 [26383.850056] 0000000000000001 ffff8800e5905e50 ffffffff81165bd7 ffffea00038e7e00 [26383.850056] ffffffff8126b385 0000000000000202 ffff88003b7d39d8 ffffffff8109f1a5 [26383.850056] Call Trace: [26383.850056] [<ffffffff8109ee2d>] ? mark_held_locks+0x7d/0x120 [26383.850056] [<ffffffff81605f70>] ? _raw_spin_unlock_irqrestore+0x40/0x70 [26383.850056] [<ffffffff81165bd7>] ? kmem_cache_free+0x87/0x160 [26383.850056] [<ffffffff8126b385>] ? jbd2_journal_stop+0x1e5/0x2d0 [26383.850056] [<ffffffff8109f1a5>] ? trace_hardirqs_on_caller+0x105/0x190 [26383.850056] [<ffffffff8109f23d>] ? trace_hardirqs_on+0xd/0x10 [26383.850056] [<ffffffff811bceb6>] ? aio_complete+0x46/0x230 [26383.850056] [<ffffffff810a10e2>] lock_acquire+0xa2/0x120 [26383.850056] [<ffffffff811bceb6>] ? aio_complete+0x46/0x230 [26383.850056] [<ffffffff8160588e>] _raw_spin_lock_irqsave+0x4e/0x70 [26383.850056] [<ffffffff811bceb6>] ? aio_complete+0x46/0x230 [26383.850056] [<ffffffff812481ea>] ? ext4_convert_unwritten_extents+0xca/0x130 [26383.850056] [<ffffffff811bceb6>] aio_complete+0x46/0x230 [26383.850056] [<ffffffff8121d201>] ? ext4_sync_file+0xb1/0x3e0 [26383.850056] [<ffffffff81228130>] ext4_end_io_nolock+0x60/0x100 [26383.850056] [<ffffffff8121d108>] ext4_flush_completed_IO+0x78/0xc0 [26383.850056] [<ffffffff8121d258>] ext4_sync_file+0x108/0x3e0 [26383.850056] [<ffffffff8111e86c>] ? generic_file_aio_write+0x5c/0xf0 [26383.850056] [<ffffffff81603de9>] ? __mutex_unlock_slowpath+0xd9/0x180 [26383.850056] [<ffffffff8109f1a5>] ? trace_hardirqs_on_caller+0x105/0x190 [26383.850056] [<ffffffff811a4d0b>] vfs_fsync_range+0x2b/0x40 [26383.850056] [<ffffffff811a4d81>] generic_write_sync+0x41/0x50 [26383.850056] [<ffffffff8111e8de>] generic_file_aio_write+0xce/0xf0 [26383.850056] [<ffffffff8121ce0f>] ext4_file_write+0x6f/0x2a0 [26383.850056] [<ffffffff811bdd57>] ? do_io_submit+0x2c7/0xb80 [26383.850056] [<ffffffff81605f20>] ? _raw_spin_unlock_irq+0x30/0x40 [26383.850056] [<ffffffff8121cda0>] ? ext4_file_mmap+0x60/0x60 [26383.850056] [<ffffffff811bb8bc>] aio_rw_vect_retry+0x7c/0x1d0 [26383.850056] [<ffffffff811bb840>] ? aio_fsync+0x30/0x30 [26383.850056] [<ffffffff811bd106>] aio_run_iocb+0x66/0x1a0 [26383.850056] [<ffffffff811be128>] do_io_submit+0x698/0xb80 [26383.850056] [<ffffffff810a0b98>] ? lock_release_non_nested+0xa8/0x330 [26383.850056] [<ffffffff81315d1e>] ? trace_hardirqs_on_thunk+0x3a/0x3f [26383.850056] [<ffffffff811be620>] sys_io_submit+0x10/0x20 [26383.850056] [<ffffffff8160e1c2>] system_call_fastpath+0x16/0x1b [26383.850056] Code: 48 89 5d d8 4c 89 75 f0 45 0f 45 e0 85 c0 48 89 fb 4c 8b 55 10 0f 84 ee 03 00 00 44 8b 35 ab 4d d6 00 45 85 f6 0f 84 fe 03 00 00 <48> 81 3b 20 7d e6 81 b8 01 00 00 00 44 0f 44 e0 83 fe 01 0f 86 [26383.850056] RIP [<ffffffff8109f582>] __lock_acquire+0x62/0x15d0 [26383.850056] RSP <ffff88003b7d3968> [26383.850056] CR2: 0000000000000088 [26383.850056] ---[ end trace ea74669fb6eba98a ]--- [26383.850056] ------------[ cut here ]------------ [26383.850056] WARNING: at /srv/autobuild-ceph/gitbuilder.git/build/kernel/exit.c:898 do_exit+0x55/0x880() [26383.850056] Hardware name: H8SSL-I2 [26383.850056] Modules linked in: ufs qnx4 hfsplus hfs minix ntfs vfat msdos fat jfs xfs exportfs reiserfs ceph libceph cryptd aes_x86_64 aes_generic radeon ttm drm_kms_helper drm shpchp i2c_piix4 i2c_algo_bit k8temp psmouse amd64_edac_mod edac_core serio_raw edac_mce_amd lp parport btrfs tg3 sata_svw pata_serverworks floppy zlib_deflate crc32c libcrc32c [last unloaded: rbd] [26383.850056] Pid: 31861, comm: ceph-osd Tainted: G D 3.2.0-ceph-00149-geda84b5 #1 [26383.850056] Call Trace: [26383.850056] [<ffffffff810634af>] warn_slowpath_common+0x7f/0xc0 [26383.850056] [<ffffffff8106350a>] warn_slowpath_null+0x1a/0x20 [26383.850056] [<ffffffff81066b25>] do_exit+0x55/0x880 [26383.850056] [<ffffffff81063c65>] ? kmsg_dump+0x105/0x140 [26383.850056] [<ffffffff81063bd5>] ? kmsg_dump+0x75/0x140 [26383.850056] [<ffffffff81607100>] oops_end+0xb0/0xf0 [26383.850056] [<ffffffff8103f88d>] no_context+0xfd/0x270 [26383.850056] [<ffffffff8103fb45>] __bad_area_nosemaphore+0x145/0x230 [26383.850056] [<ffffffff8103fca1>] bad_area+0x51/0x60 [26383.850056] [<ffffffff81609a3e>] ? do_page_fault+0xfe/0x4b0 [26383.850056] [<ffffffff81609da2>] do_page_fault+0x462/0x4b0 [26383.850056] [<ffffffff8109ee2d>] ? mark_held_locks+0x7d/0x120 [26383.850056] [<ffffffff81315d5d>] ? trace_hardirqs_off_thunk+0x3a/0x3c [26383.850056] [<ffffffff81606535>] page_fault+0x25/0x30 [26383.850056] [<ffffffff8109f582>] ? __lock_acquire+0x62/0x15d0 [26383.850056] [<ffffffff8109ee2d>] ? mark_held_locks+0x7d/0x120 [26383.850056] [<ffffffff81605f70>] ? _raw_spin_unlock_irqrestore+0x40/0x70 [26383.850056] [<ffffffff81165bd7>] ? kmem_cache_free+0x87/0x160 [26383.850056] [<ffffffff8126b385>] ? jbd2_journal_stop+0x1e5/0x2d0 [26383.850056] [<ffffffff8109f1a5>] ? trace_hardirqs_on_caller+0x105/0x190 [26383.850056] [<ffffffff8109f23d>] ? trace_hardirqs_on+0xd/0x10 [26383.850056] [<ffffffff811bceb6>] ? aio_complete+0x46/0x230 [26383.850056] [<ffffffff810a10e2>] lock_acquire+0xa2/0x120 [26383.850056] [<ffffffff811bceb6>] ? aio_complete+0x46/0x230 [26383.850056] [<ffffffff8160588e>] _raw_spin_lock_irqsave+0x4e/0x70 [26383.850056] [<ffffffff811bceb6>] ? aio_complete+0x46/0x230 [26383.850056] [<ffffffff812481ea>] ? ext4_convert_unwritten_extents+0xca/0x130 [26383.850056] [<ffffffff811bceb6>] aio_complete+0x46/0x230 [26383.850056] [<ffffffff8121d201>] ? ext4_sync_file+0xb1/0x3e0 [26383.850056] [<ffffffff81228130>] ext4_end_io_nolock+0x60/0x100 [26383.850056] [<ffffffff8121d108>] ext4_flush_completed_IO+0x78/0xc0 [26383.850056] [<ffffffff8121d258>] ext4_sync_file+0x108/0x3e0 [26383.850056] [<ffffffff8111e86c>] ? generic_file_aio_write+0x5c/0xf0 [26383.850056] [<ffffffff81603de9>] ? __mutex_unlock_slowpath+0xd9/0x180 [26383.850056] [<ffffffff8109f1a5>] ? trace_hardirqs_on_caller+0x105/0x190 [26383.850056] [<ffffffff811a4d0b>] vfs_fsync_range+0x2b/0x40 [26383.850056] [<ffffffff811a4d81>] generic_write_sync+0x41/0x50 [26383.850056] [<ffffffff8111e8de>] generic_file_aio_write+0xce/0xf0 [26383.850056] [<ffffffff8121ce0f>] ext4_file_write+0x6f/0x2a0 [26383.850056] [<ffffffff811bdd57>] ? do_io_submit+0x2c7/0xb80 [26383.850056] [<ffffffff81605f20>] ? _raw_spin_unlock_irq+0x30/0x40 [26383.850056] [<ffffffff8121cda0>] ? ext4_file_mmap+0x60/0x60 [26383.850056] [<ffffffff811bb8bc>] aio_rw_vect_retry+0x7c/0x1d0 [26383.850056] [<ffffffff811bb840>] ? aio_fsync+0x30/0x30 [26383.850056] [<ffffffff811bd106>] aio_run_iocb+0x66/0x1a0 [26383.850056] [<ffffffff811be128>] do_io_submit+0x698/0xb80 [26383.850056] [<ffffffff810a0b98>] ? lock_release_non_nested+0xa8/0x330 [26383.850056] [<ffffffff81315d1e>] ? trace_hardirqs_on_thunk+0x3a/0x3f [26383.850056] [<ffffffff811be620>] sys_io_submit+0x10/0x20 [26383.850056] [<ffffffff8160e1c2>] system_call_fastpath+0x16/0x1b [26383.850056] ---[ end trace ea74669fb6eba98b ]--- -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
