From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from arcturus.aphlor.org ([188.246.204.175]:54826 "EHLO arcturus.aphlor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753676AbcJZA2D (ORCPT ); Tue, 25 Oct 2016 20:28:03 -0400 Date: Tue, 25 Oct 2016 20:27:52 -0400 From: Dave Jones To: Chris Mason Cc: Andy Lutomirski , Andy Lutomirski , Linus Torvalds , Jens Axboe , Al Viro , Josef Bacik , David Sterba , linux-btrfs , Linux Kernel , Dave Chinner Subject: Re: bio linked list corruption. Message-ID: <20161026002752.qvrm6yxqb54fiqnd@codemonkey.org.uk> References: <332c8e94-a969-093f-1fb4-30d89be8993e@kernel.org> <20161020225028.czodw54tjbiwwv3o@codemonkey.org.uk> <20161020230341.jsxpia2sy53xn5l5@codemonkey.org.uk> <20161021200245.kahjzgqzdfyoe3uz@codemonkey.org.uk> <20161022152033.gkmm3l75kqjzsije@codemonkey.org.uk> <20161024044051.onmh4h6sc2bjxzzc@codemonkey.org.uk> <77d9983d-a00a-1dc1-a9a1-631de1d0c146@fb.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <77d9983d-a00a-1dc1-a9a1-631de1d0c146@fb.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: On Mon, Oct 24, 2016 at 09:42:39AM -0400, Chris Mason wrote: > > > Well crud, we're back to wondering if this is Btrfs or the stack > > > corruption. Since the pagevecs are on the stack and this is a new > > > crash, my guess is you'll be able to trigger it on xfs/ext4 too. But we > > > should make sure. > > > > Here's an interesting one from today, pointing the finger at xattrs again. > > > > > > [69943.450108] Oops: 0003 [#1] PREEMPT SMP DEBUG_PAGEALLOC > > [69943.454452] CPU: 1 PID: 21558 Comm: trinity-c60 Not tainted 4.9.0-rc1-think+ #11 > > [69943.463510] task: ffff8804f8dd3740 task.stack: ffffc9000b108000 > > [69943.468077] RIP: 0010:[] > > Was this btrfs? I already told you elsewhere, but for benefit of everyone else, yes, it was. At Chris' behest, I gave ext4 some more air-time with this workload. It ran for 1 day 6 hrs without incident before I got bored and tried something else. I threw XFS on the test partition, restarted the test, and got the warnings below across two reboots. DaveC: Do these look like real problems, or is this more "looks like random memory corruption" ? It's been a while since I did some stress testing on XFS, so these might not be new.. XFS: Assertion failed: oldlen > newlen, file: fs/xfs/libxfs/xfs_bmap.c, line: 2938 ------------[ cut here ]------------ kernel BUG at fs/xfs/xfs_message.c:113! invalid opcode: 0000 [#1] PREEMPT SMP CPU: 1 PID: 6227 Comm: trinity-c9 Not tainted 4.9.0-rc1-think+ #6 task: ffff8804f4658040 task.stack: ffff88050568c000 RIP: 0010:[] [] assfail+0x1b/0x20 [xfs] RSP: 0000:ffff88050568f9e8 EFLAGS: 00010282 RAX: 00000000ffffffea RBX: 0000000000000046 RCX: 0000000000000001 RDX: 00000000ffffffc0 RSI: 000000000000000a RDI: ffffffffa02fe34d RBP: ffff88050568f9e8 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000000a R11: f000000000000000 R12: ffff88050568fb44 R13: 00000000000000f3 R14: ffff8804f292bf88 R15: 000ffffffffe0046 FS: 00007fe2ddfdfb40(0000) GS:ffff88050a000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe2dbabd000 CR3: 00000004f461f000 CR4: 00000000001406e0 Stack: ffff88050568fa88 ffffffffa027ccee fffffffffffffff9 ffff8804f16fd8b0 0000000000003ffa 0000000000000032 ffff8804f292bf40 0000000000004976 000ffffffffe0008 00000000000004fd ffff880400000000 0000000000005107 Call Trace: [] xfs_bmap_add_extent_hole_delay+0x54e/0x620 [xfs] [] xfs_bmapi_reserve_delalloc+0x2b4/0x400 [xfs] [] xfs_file_iomap_begin_delay.isra.12+0x247/0x3c0 [xfs] [] xfs_file_iomap_begin+0x181/0x270 [xfs] [] ? xfs_file_iomap_end+0x9e/0xe0 [xfs] [] iomap_apply+0x53/0x100 [] ? iomap_write_end+0x70/0x70 [] iomap_file_buffered_write+0x6b/0x90 [] ? iomap_write_end+0x70/0x70 [] xfs_file_buffered_aio_write+0xe8/0x1d0 [xfs] [] ? __lock_acquire.isra.32+0x1cf/0x8c0 [] xfs_file_write_iter+0x85/0x120 [xfs] [] do_iter_readv_writev+0xa8/0x100 [] do_readv_writev+0x172/0x210 [] ? xfs_file_buffered_aio_write+0x1d0/0x1d0 [xfs] [] ? __fdget_pos+0x44/0x50 [] ? mutex_lock_nested+0x272/0x3f0 [] ? __fdget_pos+0x44/0x50 [] ? __fdget_pos+0x44/0x50 [] vfs_writev+0x3a/0x50 [] do_writev+0x50/0xd0 [] SyS_writev+0xb/0x10 [] do_syscall_64+0x5c/0x170 [] entry_SYSCALL64_slow_path+0x25/0x25 Code: 48 c7 c7 65 e3 2f a0 e8 74 37 da e0 5d c3 66 90 55 48 89 f1 41 89 d0 48 c7 c6 18 93 30 a0 48 89 fa 48 89 e5 31 ff e8 65 fa ff ff <0f> 0b 0f 1f 00 55 48 63 f6 49 89 f9 41 b8 01 00 00 00 48 89 e5 RIP [] assfail+0x1b/0x20 [xfs] RSP XFS: Assertion failed: tp->t_blk_res_used <= tp->t_blk_res, file: fs/xfs/xfs_trans.c, line: 309 kernel BUG at fs/xfs/xfs_message.c:113! invalid opcode: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC CPU: 0 PID: 7309 Comm: kworker/u8:1 Not tainted 4.9.0-rc1-think+ #11 Workqueue: writeback wb_workfn (flush-8:0) task: ffff88025eb98040 task.stack: ffffc9000a914000 RIP: 0010:[] [] assfail+0x1b/0x20 [xfs] RSP: 0018:ffffc9000a917410 EFLAGS: 00010282 RAX: 00000000ffffffea RBX: ffff8804538d22b8 RCX: 0000000000000001 RDX: 00000000ffffffc0 RSI: 000000000000000a RDI: ffffffffa059c34d RBP: ffffc9000a917410 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000000a R11: f000000000000000 R12: ffffffffffffffff R13: ffff88047c765698 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff880507800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000008 CR3: 00000004c56e7000 CR4: 00000000001406f0 DR0: 00007fec5e3c9000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Stack: ffffc9000a917438 ffffffffa057abe1 ffffc9000a917510 ffffc9000a917510 ffffc9000a917510 ffffc9000a917460 ffffffffa0548eff ffffc9000a917510 0000000000000001 ffffc9000a917510 ffffc9000a917480 ffffffffa050aa3d Call Trace: [] xfs_trans_mod_sb+0x241/0x280 [xfs] [] xfs_ag_resv_alloc_extent+0x4f/0xc0 [xfs] [] xfs_alloc_ag_vextent+0x23d/0x300 [xfs] [] xfs_alloc_vextent+0x5fb/0x6d0 [xfs] [] xfs_bmap_btalloc+0x304/0x8e0 [xfs] [] ? xfs_iext_bno_to_ext+0xee/0x170 [xfs] [] xfs_bmap_alloc+0x2b/0x40 [xfs] [] xfs_bmapi_write+0x640/0x1210 [xfs] [] xfs_iomap_write_allocate+0x166/0x350 [xfs] [] xfs_map_blocks+0x1b0/0x260 [xfs] [] xfs_do_writepage+0x23b/0x730 [xfs] [] ? clear_page_dirty_for_io+0x128/0x210 [] ? clear_page_dirty_for_io+0xa1/0x210 [] write_cache_pages+0x1d6/0x4a0 [] ? xfs_aops_discard_page+0x140/0x140 [xfs] [] xfs_vm_writepages+0x59/0x80 [xfs] [] do_writepages+0x1c/0x30 [] __writeback_single_inode+0x33/0x180 [] writeback_sb_inodes+0x2a8/0x5b0 [] __writeback_inodes_wb+0x8d/0xc0 [] wb_writeback+0x1e3/0x1f0 [] wb_workfn+0xd2/0x280 [] process_one_work+0x1d5/0x490 [] ? process_one_work+0x175/0x490 [] worker_thread+0x49/0x490 [] ? process_one_work+0x490/0x490 [] ? process_one_work+0x490/0x490 [] kthread+0xee/0x110 [] ? kthread_park+0x60/0x60 [] ret_from_fork+0x22/0x30 Code: 48 c7 c7 65 c3 59 a0 e8 c4 5c b0 e0 5d c3 66 90 55 48 89 f1 41 89 d0 48 c7 c6 18 73 5a a0 48 89 fa 48 89 e5 31 ff e8 65 fa ff ff <0f> 0b 0f 1f 00 55 48 63 f6 49 89 f9 41 b8 01 00 00 00 48 89 e5 RIP [] assfail+0x1b/0x20 [xfs] RSP