Re: Kernel 4.17.4 lockup

[Dave Jones <davej@codemonkey.org.uk>]

On Wed, Jul 11, 2018 at 10:50:22AM -0700, Dave Hansen wrote:
 > On 07/11/2018 10:29 AM, H.J. Lu wrote:
 > >> I have seen it on machines with various amounts of cores and RAMs.
 > >> It triggers the fastest on 8 cores with 6GB RAM reliably.
 > > Here is the first kernel message.
 > 
 > This looks like random corruption again.  It's probably a bogus 'struct
 > page' that fails the move_freepages() pfn_valid() checks.  I'm too lazy
 > to go reproduce the likely stack trace (not sure why it didn't show up
 > on your screen), but this could just be another symptom of the same
 > issue that caused the TLB batching oops.
 > 
 > My money is on this being some kind of odd stack corruption, maybe
 > interrupt-induced, but that's a total guess at this point.

So, maybe related.. I reported this to linux-mm a few days ago:

When I ran an rsync on my machine I use for backups, it eventually
hits this trace..

kernel BUG at mm/page_alloc.c:2016!
invalid opcode: 0000 [#1] SMP RIP: move_freepages_block+0x120/0x2d0
CPU: 3 PID: 0 Comm: swapper/3 Not tainted 4.18.0-rc4-backup+ #1
Hardware name: ASUS All Series/Z97-DELUXE, BIOS 2602 08/18/2015
RIP: 0010:move_freepages_block+0x120/0x2d0
Code: 05 48 01 c8 74 3b f6 00 02 74 36 48 8b 03 48 c1 e8 3e 48 8d 0c 40 48 8b 86 c0 7f 00 00 48 c1 e8 3e 48 8d 04 40 48 39 c8 74 17 <0f> 0b 45 31 f6 48 83 c4 28 44 89 f0 5b 5d 41
5c 41 5d 41 5e 41 5f
RSP: 0018:ffff88043fac3af8 EFLAGS: 00010093
RAX: 0000000000000000 RBX: ffffea0002e20000 RCX: 0000000000000003
RDX: 0000000000000000 RSI: ffffea0002e20000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff88043fac3b5c R09: ffffffff9295e110
R10: ffff88043fdf4000 R11: ffffea0002e20008 R12: ffffea0002e20000
R13: ffffffff9295dd40 R14: 0000000000000008 R15: ffffea0002e27fc0
FS:  0000000000000000(0000) GS:ffff88043fac0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2a75f71fe8 CR3: 00000001e380f006 CR4: 00000000001606e0
Call Trace:
 <IRQ>
 ? lock_acquire+0xe6/0x1dc
 steal_suitable_fallback+0x152/0x1a0
 get_page_from_freelist+0x1029/0x1650
 ? free_debug_processing+0x271/0x410
 __alloc_pages_nodemask+0x111/0x310
 page_frag_alloc+0x74/0x120
 __netdev_alloc_skb+0x95/0x110
 e1000_alloc_rx_buffers+0x225/0x2b0
 e1000_clean_rx_irq+0x2ee/0x450
 e1000e_poll+0x7c/0x2e0
 net_rx_action+0x273/0x4d0
 __do_softirq+0xc6/0x4d6
 irq_exit+0xbb/0xc0
 do_IRQ+0x60/0x110
 common_interrupt+0xf/0xf
 </IRQ>
RIP: 0010:cpuidle_enter_state+0xb5/0x390
Code: 89 04 24 0f 1f 44 00 00 31 ff e8 86 26 64 ff 80 7c 24 0f 00 0f 85 fb 01 00 00 e8 66 02 66 ff fb 48 ba cf f7 53 e3 a5 9b c4 20 <48> 8b 0c 24 4c 29 f9 48 89 c8 48 c1 f9 3f 48
f7 ea b8 ff ff ff 7f
RSP: 0018:ffffc900000abe70 EFLAGS: 00000202
 ORIG_RAX: ffffffffffffffdc
RAX: ffff880107fe8040 RBX: 0000000000000003 RCX: 0000000000000001
RDX: 20c49ba5e353f7cf RSI: 0000000000000001 RDI: ffff880107fe8040
RBP: ffff88043fae8c20 R08: 0000000000000001 R09: 0000000000000018
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff928fb7d8
R13: 0000000000000003 R14: 0000000000000003 R15: 0000015e55aecf23
 do_idle+0x128/0x230
 cpu_startup_entry+0x6f/0x80
 start_secondary+0x192/0x1f0
 secondary_startup_64+0xa5/0xb0
NMI watchdog: Watchdog detected hard LOCKUP on cpu 4

Everything then locks up & rebooots.

It's fairly reproduceable, though every time I run it my rsync gets further, and eventually I suspect it
won't create enough load to reproduce.

2006 #ifndef CONFIG_HOLES_IN_ZONE
2007         /*
2008          * page_zone is not safe to call in this context when
2009          * CONFIG_HOLES_IN_ZONE is set. This bug check is probably redundant
2010          * anyway as we check zone boundaries in move_freepages_block().
2011          * Remove at a later date when no bug reports exist related to
2012          * grouping pages by mobility
2013          */
2014         VM_BUG_ON(pfn_valid(page_to_pfn(start_page)) &&
2015                   pfn_valid(page_to_pfn(end_page)) &&
2016                   page_zone(start_page) != page_zone(end_page));
2017 #endif
2018


I could trigger it fairly quickly last week, but it seemed dependant on just how much
rsync is actually transferring. (There are millions of files, and only a few thousand had changed)

When there's nothing changed, the rsync was running to completion every time.

	Dave