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SubjectKASAN + general protection fault while writing to mmc
Hi,

I got this while restoring a backup with dd on an SDCard.
On 4.13.0-rc4 I get it everytime.

I'm not sure if it isn't a hardware problem as I have no more cards
left.


[ 484.751664] ==================================================================
[ 484.751695] BUG: KASAN: slab-out-of-bounds in sg_next+0x20/0x50
[ 484.751706] Read of size 8 at addr ffff8801ed53e530 by task mmcqd/0/187

[ 484.751724] CPU: 0 PID: 187 Comm: mmcqd/0 Not tainted 4.13.0-rc4-preempt+ #38
[ 484.751729] Hardware name: Hewlett-Packard HP EliteBook 2560p/162B, BIOS 68SSU Ver. F.02 07/26/2011
[ 484.751732] Call Trace:
[ 484.751745] dump_stack+0x4f/0x69
[ 484.751756] print_address_description+0x78/0x290
[ 484.751764] ? sg_next+0x20/0x50
[ 484.751772] kasan_report+0x22f/0x340
[ 484.751780] __asan_load8+0x54/0x90
[ 484.751788] sg_next+0x20/0x50
[ 484.751796] blk_rq_map_sg+0x33a/0x800
[ 484.751807] mmc_queue_map_sg+0x134/0x150
[ 484.751819] mmc_blk_rw_rq_prep+0x2ba/0x7b0
[ 484.751828] mmc_blk_issue_rw_rq+0x1a9/0x690
[ 484.751837] ? mmc_blk_reset+0x250/0x250
[ 484.751845] ? cfq_dispatch_requests+0x7f3/0x1220
[ 484.751852] ? mmc_access_rpmb+0x28/0x40
[ 484.751859] mmc_blk_issue_rq+0x4a1/0xbb0
[ 484.751868] mmc_queue_thread+0x178/0x300
[ 484.751885] ? mmc_blk_issue_rq+0xbb0/0xbb0
[ 484.751892] ? __schedule+0x46c/0xc20
[ 484.751899] ? __sched_text_start+0x8/0x8
[ 484.751908] ? __wake_up_common+0x75/0xb0
[ 484.751915] ? preempt_count_sub+0x18/0xc0
[ 484.751922] kthread+0x18c/0x1e0
[ 484.751927] ? mmc_blk_issue_rq+0xbb0/0xbb0
[ 484.751933] ? kthread_create_on_node+0xb0/0xb0
[ 484.751941] ret_from_fork+0x22/0x30

[ 484.751951] Allocated by task 81:
[ 484.751961] save_stack_trace+0x1b/0x20
[ 484.751966] save_stack+0x46/0xd0
[ 484.751971] kasan_kmalloc+0xad/0xe0
[ 484.751976] __kmalloc+0x11c/0x260
[ 484.751980] mmc_alloc_sg+0x2c/0x60
[ 484.751985] mmc_init_request+0x162/0x190
[ 484.751990] alloc_request_size+0x77/0xa0
[ 484.751996] mempool_create_node+0x175/0x1d0
[ 484.752001] blk_init_rl+0xf4/0x180
[ 484.752007] blk_init_allocated_queue+0xb9/0x210
[ 484.752011] mmc_init_queue+0x154/0x580
[ 484.752018] mmc_blk_alloc_req+0x14d/0x510
[ 484.752024] mmc_blk_probe+0x41f/0x820
[ 484.752031] mmc_bus_probe+0x35/0x40
[ 484.752039] driver_probe_device+0x322/0x400
[ 484.752054] __device_attach_driver+0xc4/0x100
[ 484.752056] bus_for_each_drv+0xf6/0x160
[ 484.752059] __device_attach+0x161/0x1c0
[ 484.752061] device_initial_probe+0x13/0x20
[ 484.752063] bus_probe_device+0xfe/0x120
[ 484.752065] device_add+0x549/0xa10
[ 484.752067] mmc_add_card+0x1fe/0x420
[ 484.752069] mmc_attach_sd+0x15e/0x210
[ 484.752072] mmc_rescan+0x585/0x620
[ 484.752075] process_one_work+0x3f2/0x760
[ 484.752077] worker_thread+0x90/0x710
[ 484.752079] kthread+0x18c/0x1e0
[ 484.752081] ret_from_fork+0x22/0x30

[ 484.752083] Freed by task 0:
[ 484.752085] (stack is not available)

[ 484.752089] The buggy address belongs to the object at ffff8801ed53e510
which belongs to the cache kmalloc-32 of size 32
[ 484.752093] The buggy address is located 0 bytes to the right of
32-byte region [ffff8801ed53e510, ffff8801ed53e530)
[ 484.752096] The buggy address belongs to the page:
[ 484.752099] page:ffffea0007b54f80 count:1 mapcount:0 mapping: (null) index:0x0
[ 484.752103] flags: 0x100000000000100(slab)
[ 484.752108] raw: 0100000000000100 0000000000000000 0000000000000000 0000000100550055
[ 484.752111] raw: 0000000000000000 0000000100000001 ffff8801f580f800 0000000000000000
[ 484.752113] page dumped because: kasan: bad access detected

[ 484.752116] Memory state around the buggy address:
[ 484.752119] ffff8801ed53e400: 00 fc fc fc 00 00 00 00 fc fc 00 00 00 00 fc fc
[ 484.752122] ffff8801ed53e480: 00 00 00 00 fc fc 00 00 00 00 fc fc 00 00 00 00
[ 484.752126] >ffff8801ed53e500: fc fc 00 00 00 00 fc fc 00 00 00 fc fc fc 00 00
[ 484.752128] ^
[ 484.752130] ffff8801ed53e580: 00 fc fc fc 00 00 00 fc fc fc 00 00 00 fc fc fc
[ 484.752133] ffff8801ed53e600: 00 00 00 fc fc fc fb fb fb fb fc fc 00 00 00 fc
[ 484.752135] ==================================================================
[ 484.752137] Disabling lock debugging due to kernel taint
[ 484.752143] general protection fault: 0000 [#1] PREEMPT SMP KASAN
[ 484.752227] Modules linked in: tun bridge stp llc fuse ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_addrtype iptable_nat nf_nat_ipv4 nf_nat x86_pkg_temp_thermal kvm_intel kvm irqbypass crc32_pclmul iwldvm mac80211 input_leds iwlwifi cfg80211 rfkill i915 ext4 mbcache jbd2 ahci libahci libata ehci_pci ehci_hcd
[ 484.752514] CPU: 0 PID: 187 Comm: mmcqd/0 Tainted: G B 4.13.0-rc4-preempt+ #38
[ 484.752597] Hardware name: Hewlett-Packard HP EliteBook 2560p/162B, BIOS 68SSU Ver. F.02 07/26/2011
[ 484.752687] task: ffff8801f051bb00 task.stack: ffff8801eb858000
[ 484.752749] RIP: 0010:blk_rq_map_sg+0x345/0x800
[ 484.752796] RSP: 0018:ffff8801eb85fa68 EFLAGS: 00010247
[ 484.752851] RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff81429a75
[ 484.752956] RDX: 0000000000000000 RSI: 0000000000000008 RDI: c9e000f200000050
[ 484.753064] RBP: ffff8801eb85fb10 R08: fffffbfff0550bcc R09: ffffffff82a85e94
[ 484.753185] R10: ffff8801eb85f957 R11: fffffbfff0550bcc R12: 0000000000001000
[ 484.753323] R13: 0000000000000000 R14: 0000000000003000 R15: c9e000f200000050
[ 484.753443] FS: 0000000000000000(0000) GS:ffff8801f5c00000(0000) knlGS:0000000000000000
[ 484.753525] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 484.753583] CR2: 00007f4505491000 CR3: 000000000240e000 CR4: 00000000000406f0
[ 484.753689] Call Trace:
[ 484.753807] mmc_queue_map_sg+0x134/0x150
[ 484.753853] mmc_blk_rw_rq_prep+0x2ba/0x7b0
[ 484.753899] mmc_blk_issue_rw_rq+0x1a9/0x690
[ 484.753946] ? mmc_blk_reset+0x250/0x250
[ 484.753988] ? cfq_dispatch_requests+0x7f3/0x1220
[ 484.754038] ? mmc_access_rpmb+0x28/0x40
[ 484.754081] mmc_blk_issue_rq+0x4a1/0xbb0
[ 484.754124] mmc_queue_thread+0x178/0x300
[ 484.754190] ? mmc_blk_issue_rq+0xbb0/0xbb0
[ 484.754385] ? __schedule+0x46c/0xc20
[ 484.754594] ? __sched_text_start+0x8/0x8
[ 484.754729] ? __wake_up_common+0x75/0xb0
[ 484.754875] ? preempt_count_sub+0x18/0xc0
[ 484.755026] kthread+0x18c/0x1e0
[ 484.755138] ? mmc_blk_issue_rq+0xbb0/0xbb0
[ 484.755279] ? kthread_create_on_node+0xb0/0xb0
[ 484.755432] ret_from_fork+0x22/0x30
[ 484.755553] Code: 48 01 f2 48 39 d1 0f 84 ca 02 00 00 4c 89 ff e8 82 75 e7 ff 4c 89 ff 49 83 27 fd e8 86 99 03 00 49 89 c7 4c 89 ff e8 6b 75 e7 ff <49> 8b 07 83 e0 03 f6 45 c8 03 0f 85 68 01 00 00 48 0b 45 c8 49
[ 484.756270] RIP: blk_rq_map_sg+0x345/0x800 RSP: ffff8801eb85fa68
[ 484.792060] ---[ end trace 5c02e9b4d93d7033 ]---
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