On Sun, Oct 23, 2016 at 05:32:21PM -0400, Chris Mason wrote: > > > On 10/22/2016 11:20 AM, Dave Jones wrote: > > On Fri, Oct 21, 2016 at 04:02:45PM -0400, Dave Jones wrote: > > > > > > It could be worth trying this, too: > > > > > > > > > > https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git/commit/?h=x86/vmap_stack&id=174531fef4e8 > > > > > > > > It occurred to me that the current code is a little bit fragile. > > > > > > It's been nearly 24hrs with the above changes, and it's been pretty much > > > silent the whole time. > > > > > > The only thing of note over that time period has been a btrfs lockdep > > > warning that's been around for a while, and occasional btrfs checksum > > > failures, which I've been seeing for a while, but seem to have gotten > > > worse since 4.8. > > > > > > I'm pretty confident in the disk being ok in this machine, so I think > > > the checksum warnings are bogus. Chris suggested they may be the result > > > of memory corruption, but there's little else going on. > > > > The only interesting thing last nights run was this.. > > > > BUG: Bad page state in process kworker/u8:1 pfn:4e2b70 > > page:ffffea00138adc00 count:0 mapcount:0 mapping:ffff88046e9fc2e0 > > index:0xdf0 > > flags: 0x400000000000000c(referenced|uptodate) > > page dumped because: non-NULL mapping > > CPU: 3 PID: 24234 Comm: kworker/u8:1 Not tainted 4.9.0-rc1-think+ #11 > > Workqueue: writeback wb_workfn (flush-btrfs-2) > > 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:[<ffffffff810c3f6b>] [69943.472704] [<ffffffff810c3f6b>] __lock_acquire.isra.32+0x6b/0x8c0 [69943.477489] RSP: 0018:ffffc9000b10b9e8 EFLAGS: 00010086 [69943.482368] RAX: ffffffff81789b90 RBX: ffff8804f8dd3740 RCX: 0000000000000000 [69943.487410] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [69943.492515] RBP: ffffc9000b10ba18 R08: 0000000000000001 R09: 0000000000000000 [69943.497666] R10: 0000000000000001 R11: 00003f9cfa7f4e73 R12: 0000000000000000 [69943.502880] R13: 0000000000000000 R14: ffffc9000af7bd48 R15: ffff8804f8dd3740 [69943.508163] FS: 00007f64904a2b40(0000) GS:ffff880507a00000(0000) knlGS:0000000000000000 [69943.513591] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [69943.518917] CR2: ffffffff81789d28 CR3: 00000004a8f16000 CR4: 00000000001406e0 [69943.524253] DR0: 00007f5b97fd4000 DR1: 0000000000000000 DR2: 0000000000000000 [69943.529488] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 [69943.534771] Stack: [69943.540023] ffff880507bd74c0 [69943.545317] ffff8804f8dd3740 0000000000000046 0000000000000286[69943.545456] ffffc9000af7bd08 [69943.550930] 0000000000000100 ffffc9000b10ba50 ffffffff810c4b68[69943.551069] ffffffff810ba40c [69943.556657] ffff880400000000 0000000000000000 ffffc9000af7bd48[69943.556796] Call Trace: [69943.562465] [<ffffffff810c4b68>] lock_acquire+0x58/0x70 [69943.568354] [<ffffffff810ba40c>] ? finish_wait+0x3c/0x70 [69943.574306] [<ffffffff8178fef2>] _raw_spin_lock_irqsave+0x42/0x80 [69943.580335] [<ffffffff810ba40c>] ? finish_wait+0x3c/0x70 [69943.586237] [<ffffffff810ba40c>] finish_wait+0x3c/0x70 [69943.591992] [<ffffffff81169727>] shmem_fault+0x167/0x1b0 [69943.597807] [<ffffffff810ba6c0>] ? prepare_to_wait_event+0x100/0x100 [69943.603741] [<ffffffff8117b46d>] __do_fault+0x6d/0x1b0 [69943.609743] [<ffffffff8117f168>] handle_mm_fault+0xc58/0x1170 [69943.615822] [<ffffffff8117e553>] ? handle_mm_fault+0x43/0x1170 [69943.621971] [<ffffffff81044982>] __do_page_fault+0x172/0x4e0 [69943.628184] [<ffffffff81044d10>] do_page_fault+0x20/0x70 [69943.634449] [<ffffffff8132a897>] ? debug_smp_processor_id+0x17/0x20 [69943.640784] [<ffffffff81791f3f>] page_fault+0x1f/0x30 [69943.647170] [<ffffffff8133d69c>] ? strncpy_from_user+0x5c/0x170 [69943.653480] [<ffffffff8133d686>] ? strncpy_from_user+0x46/0x170 [69943.659632] [<ffffffff811f22a7>] setxattr+0x57/0x170 [69943.665846] [<ffffffff8132a897>] ? debug_smp_processor_id+0x17/0x20 [69943.672172] [<ffffffff810c1f09>] ? get_lock_stats+0x19/0x50 [69943.678558] [<ffffffff810a58f6>] ? sched_clock_cpu+0xb6/0xd0 [69943.685007] [<ffffffff810c40cf>] ? __lock_acquire.isra.32+0x1cf/0x8c0 [69943.691542] [<ffffffff8132a8b3>] ? __this_cpu_preempt_check+0x13/0x20 [69943.698130] [<ffffffff8109b9bc>] ? preempt_count_add+0x7c/0xc0 [69943.704791] [<ffffffff811ecda1>] ? __mnt_want_write+0x61/0x90 [69943.711519] [<ffffffff811f2638>] SyS_fsetxattr+0x78/0xa0 [69943.718300] [<ffffffff8100255c>] do_syscall_64+0x5c/0x170 [69943.724949] [<ffffffff81790a4b>] entry_SYSCALL64_slow_path+0x25/0x25 [69943.731521] Code: [69943.738124] 00 83 fe 01 0f 86 0e 03 00 00 31 d2 4c 89 f7 44 89 45 d0 89 4d d4 e8 75 e7 ff ff 8b 4d d4 48 85 c0 44 8b 45 d0 0f 84 d8 02 00 00 <f0> ff 80 98 01 00 00 8b 15 e0 21 8f 01 45 8b 8f 50 08 00 00 85 [69943.745506] RIP [69943.752432] [<ffffffff810c3f6b>] __lock_acquire.isra.32+0x6b/0x8c0 RSP <ffffc9000b10b9e8> [69943.766856] CR2: ffffffff81789d28
