FYI, we noticed the below changes on
git://internal_merge_and_test_tree devel-catchup-201512220028
commit 26efb85d35c71bc297e22773928062c97e41a8a2 ("blk-mq: dynamic h/w context count")
+------------------------------------------------+------------+------------+
| | e56dda0be8 | 26efb85d35 |
+------------------------------------------------+------------+------------+
| boot_successes | 15 | 2 |
| boot_failures | 0 | 12 |
| BUG_kmalloc-#(Not_tainted):Poison_overwritten | 0 | 8 |
| INFO:#-#.First_byte#instead_of | 0 | 12 |
| INFO:Slab#objects=#used=#fp=0x(null)flags= | 0 | 12 |
| INFO:Object#@offset=#fp= | 0 | 12 |
| backtrace:init | 0 | 12 |
| backtrace:kernel_init_freeable | 0 | 12 |
| BUG_kmalloc-#(Not_tainted):Redzone_overwritten | 0 | 4 |
| BUG_kmalloc-#(Tainted:G_B):Redzone_overwritten | 0 | 4 |
| backtrace:vp_find_vqs | 0 | 4 |
| backtrace:init_vq | 0 | 4 |
| backtrace:ide_host_alloc | 0 | 4 |
| backtrace:ide_pci_init_two | 0 | 4 |
| backtrace:ide_pci_init_one | 0 | 4 |
| backtrace:piix_init_one | 0 | 4 |
| backtrace:ide_scan_pcibus | 0 | 4 |
+------------------------------------------------+------------+------------+
[ 14.781818] brd: module loaded
[ 14.818921] loop: module loaded
[ 18.033239] =============================================================================
[ 18.035280] BUG kmalloc-512 (Not tainted): Redzone overwritten
[ 18.036486] -----------------------------------------------------------------------------
[ 18.036486]
[ 18.039089] Disabling lock debugging due to kernel taint
[ 18.040287] INFO: 0xffff88007e0b55b0-0xffff88007e0b55b7. First byte 0x0 instead of 0xbb
[ 18.042289] INFO: Slab 0xffffea0001f82d00 objects=19 used=19 fp=0x (null) flags=0x100000000004080
[ 18.044496] INFO: Object 0xffff88007e0b53b0 @offset=5040 fp=0xffff88007e0b56f8
[ 18.044496]
[ 18.046957] Bytes b4 ffff88007e0b53a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 18.049075] Object ffff88007e0b53b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 18.051240] Object ffff88007e0b53c0: 21 43 65 87 00 00 00 00 00 00 00 00 00 00 00 00 !Ce.............
[ 18.053370] Object ffff88007e0b53d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 18.055466] Object ffff88007e0b53e0: 00 00 00 00 00 00 00 00 21 43 65 87 00 00 00 00 ........!Ce.....
[ 18.057562] Object ffff88007e0b53f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 18.059653] Object ffff88007e0b5400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 18.061817] Object ffff88007e0b5410: 21 43 65 87 00 00 00 00 00 00 00 00 00 00 00 00 !Ce.............
[ 18.063933] Object ffff88007e0b5420: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 18.066024] Object ffff88007e0b5430: 00 00 00 00 00 00 00 00 21 43 65 87 00 00 00 00 ........!Ce.....
[ 18.068141] Object ffff88007e0b5440: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 18.070246] Object ffff88007e0b5450: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 18.072341] Object ffff88007e0b5460: 21 43 65 87 00 00 00 00 00 00 00 00 00 00 00 00 !Ce.............
[ 18.074462] Object ffff88007e0b5470: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 18.076561] Object ffff88007e0b5480: 00 00 00 00 00 00 00 00 21 43 65 87 00 00 00 00 ........!Ce.....
[ 18.078663] Object ffff88007e0b5490: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 18.080804] Object ffff88007e0b54a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 18.082917] Object ffff88007e0b54b0: 21 43 65 87 00 00 00 00 00 00 00 00 00 00 00 00 !Ce.............
[ 18.085004] Object ffff88007e0b54c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 18.087129] Object ffff88007e0b54d0: 00 00 00 00 00 00 00 00 21 43 65 87 00 00 00 00 ........!Ce.....
[ 18.089217] Object ffff88007e0b54e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 18.091373] Object ffff88007e0b54f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 18.093455] Object ffff88007e0b5500: 21 43 65 87 00 00 00 00 00 00 00 00 00 00 00 00 !Ce.............
[ 18.095548] Object ffff88007e0b5510: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 18.097645] Object ffff88007e0b5520: 00 00 00 00 00 00 00 00 21 43 65 87 00 00 00 00 ........!Ce.....
[ 18.099755] Object ffff88007e0b5530: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 18.101861] Object ffff88007e0b5540: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 18.103941] Object ffff88007e0b5550: 21 43 65 87 00 00 00 00 00 00 00 00 00 00 00 00 !Ce.............
[ 18.106079] Object ffff88007e0b5560: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 18.108176] Object ffff88007e0b5570: 00 00 00 00 00 00 00 00 21 43 65 87 00 00 00 00 ........!Ce.....
[ 18.110287] Object ffff88007e0b5580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 18.112393] Object ffff88007e0b5590: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
[ 18.114497] Object ffff88007e0b55a0: 21 43 65 87 00 00 00 00 00 00 00 00 00 00 00 00 !Ce.............
[ 18.116568] Redzone ffff88007e0b55b0: 00 00 00 00 00 00 00 00 ........
[ 18.118599] Padding ffff88007e0b56f0: 00 00 00 00 00 00 00 00 ........
[ 18.120625] CPU: 1 PID: 1 Comm: swapper/0 Tainted: G B 4.4.0-rc2-00145-g26efb85 #1
[ 18.122636] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[ 18.124670] 0000000000000000 ffff88007570b680 ffffffff81504f45 ffff880075c02b40
[ 18.126801] ffff88007570b6b0 ffffffff811c0c1e ffff88007e0b55b0 00000000000000bb
[ 18.128935] ffff880075c02b40 ffff88007e0b55b7 ffff88007570b708 ffffffff811c0cc9
[ 18.131113] Call Trace:
[ 18.131932] [<ffffffff81504f45>] dump_stack+0x4b/0x63
[ 18.133074] [<ffffffff811c0c1e>] print_trailer+0x127/0x130
[ 18.134312] [<ffffffff811c0cc9>] check_bytes_and_report+0xa2/0xea
[ 18.135625] [<ffffffff811c0f40>] check_object+0x45/0x1f7
[ 18.136801] [<ffffffff810ec749>] ? alloc_desc+0x31/0x1a4
[ 18.137980] [<ffffffff811c2127>] alloc_debug_processing+0xdc/0x14b
[ 18.139278] [<ffffffff811c261b>] ___slab_alloc+0x485/0x612
[ 18.140494] [<ffffffff810ec749>] ? alloc_desc+0x31/0x1a4
[ 18.141707] [<ffffffff811c1768>] ? deactivate_slab+0x4da/0x516
[ 18.142930] [<ffffffff810d7452>] ? __lock_is_held+0x3c/0x57
[ 18.144140] [<ffffffff810ec749>] ? alloc_desc+0x31/0x1a4
[ 18.145350] [<ffffffff811c27f7>] __slab_alloc+0x4f/0x83
[ 18.146501] [<ffffffff811c27f7>] ? __slab_alloc+0x4f/0x83
[ 18.147713] [<ffffffff810ec749>] ? alloc_desc+0x31/0x1a4
[ 18.148879] [<ffffffff810ec749>] ? alloc_desc+0x31/0x1a4
[ 18.150053] [<ffffffff811c2fa0>] kmem_cache_alloc_node_trace+0x91/0x234
[ 18.151445] [<ffffffff810da2c4>] ? trace_hardirqs_on_caller+0x17d/0x199
[ 18.152774] [<ffffffff810ec749>] alloc_desc+0x31/0x1a4
[ 18.153934] [<ffffffff81c18cd7>] __irq_alloc_descs+0xf4/0x1a3
[ 18.155171] [<ffffffff810f11f4>] irq_domain_alloc_descs+0x4c/0x72
[ 18.156443] [<ffffffff810f1939>] __irq_domain_alloc_irqs+0x81/0x22b
[ 18.157760] [<ffffffff810c2a9e>] ? local_clock+0x20/0x22
[ 18.158914] [<ffffffff810f322e>] msi_domain_alloc_irqs+0xa7/0x14b
[ 18.160217] [<ffffffff81553afb>] pci_msi_domain_alloc_irqs+0x15/0x17
[ 18.161546] [<ffffffff810797c7>] native_setup_msi_irqs+0x50/0x5b
[ 18.162798] [<ffffffff8104c981>] arch_setup_msi_irqs+0xf/0x11
[ 18.164023] [<ffffffff81552b18>] pci_msi_setup_msi_irqs+0x4e/0x52
[ 18.165357] [<ffffffff815531f2>] pci_enable_msix+0x225/0x36e
[ 18.178254] [<ffffffff8155336c>] pci_enable_msix_range+0x31/0x50
[ 18.179515] [<ffffffff815c7774>] vp_request_msix_vectors+0xbf/0x1e1
[ 18.180836] [<ffffffff815c7c64>] vp_try_to_find_vqs+0xe6/0x318
[ 18.182067] [<ffffffff8150f193>] ? vsnprintf+0x376/0x3af
[ 18.183226] [<ffffffff815c7ec4>] vp_find_vqs+0x2e/0x81
[ 18.184458] [<ffffffff816fb8c6>] init_vq+0x162/0x201
[ 18.185591] [<ffffffff816fc2f4>] ? virtblk_probe+0xc5/0x641
[ 18.186797] [<ffffffff816fc36c>] virtblk_probe+0x13d/0x641
[ 18.188004] [<ffffffff816d0abd>] ? devices_kset_move_last+0x57/0x5c
[ 18.189298] [<ffffffff815c4de6>] virtio_dev_probe+0x111/0x187
[ 18.190537] [<ffffffff816d396e>] driver_probe_device+0xf7/0x250
[ 18.191790] [<ffffffff816d3b28>] __driver_attach+0x61/0x83
[ 18.192972] [<ffffffff816d3ac7>] ? driver_probe_device+0x250/0x250
[ 18.194274] [<ffffffff816d1f0f>] bus_for_each_dev+0x6f/0x87
[ 18.195474] [<ffffffff816d3519>] driver_attach+0x1e/0x20
[ 18.196632] [<ffffffff816d3106>] bus_add_driver+0xf2/0x1e4
[ 18.197838] [<ffffffff825f3321>] ? init_cryptoloop+0x28/0x28
[ 18.199032] [<ffffffff816d464c>] driver_register+0x8a/0xc6
[ 18.200242] [<ffffffff825f3321>] ? init_cryptoloop+0x28/0x28
[ 18.201475] [<ffffffff815c4c72>] register_virtio_driver+0x2b/0x2d
[ 18.202722] [<ffffffff825f337b>] init+0x5a/0x87
[ 18.203800] [<ffffffff81000402>] do_one_initcall+0xe7/0x177
[ 18.205010] [<ffffffff825a60ec>] kernel_init_freeable+0x1c2/0x24a
[ 18.206273] [<ffffffff81c185a9>] ? rest_init+0x140/0x140
[ 18.207453] [<ffffffff81c185b7>] kernel_init+0xe/0xd4
[ 18.208600] [<ffffffff81c2689f>] ret_from_fork+0x3f/0x70
[ 18.209764] [<ffffffff81c185a9>] ? rest_init+0x140/0x140
[ 18.210958] FIX kmalloc-512: Restoring 0xffff88007e0b55b0-0xffff88007e0b55b7=0xbb
[ 18.210958]
[ 18.213431] FIX kmalloc-512: Marking all objects used
Thanks,
Kernel Test Robot