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SubjectRe: BUG: unable to handle kernel paging request in ion_heap_clear_pages
From
syzbot has found a reproducer for the following crash on:

HEAD commit: 76bb8b05 Merge tag 'kbuild-v5.5' of git://git.kernel.org/p..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=159d0f36e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=dd226651cb0f364b
dashboard link: https://syzkaller.appspot.com/bug?extid=be6ccf3081ce8afd1b56
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=171f677ae00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11db659ce00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+be6ccf3081ce8afd1b56@syzkaller.appspotmail.com

BUG: unable to handle page fault for address: fffff52000680000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 21ffee067 P4D 21ffee067 PUD aa51c067 PMD a8372067 PTE 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 3666 Comm: ion_system_heap Not tainted 5.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:121 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:135 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:166 [inline]
RIP: 0010:check_memory_region_inline mm/kasan/generic.c:182 [inline]
RIP: 0010:check_memory_region+0x9c/0x1a0 mm/kasan/generic.c:192
Code: c9 4d 0f 49 c1 49 c1 f8 03 45 85 c0 0f 84 10 01 00 00 41 83 e8 01 4e
8d 44 c0 08 eb 0d 48 83 c0 08 4c 39 c0 0f 84 a7 00 00 00 <48> 83 38 00 74
ed 4c 8d 40 08 eb 09 48 83 c0 01 49 39 c0 74 53 80
RSP: 0018:ffffc9000cf87ab8 EFLAGS: 00010212
RAX: fffff52000680000 RBX: fffff52000681600 RCX: ffffffff85d95629
RDX: 0000000000000001 RSI: 000000000000b000 RDI: ffffc90003400000
RBP: ffffc9000cf87ad0 R08: fffff52000681600 R09: 0000000000001600
R10: fffff520006815ff R11: ffffc9000340afff R12: fffff52000680000
R13: 000000000000b000 R14: 0000000000000000 R15: ffffc9000cf87d08
FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffff52000680000 CR3: 00000000a6755000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
memset+0x24/0x40 mm/kasan/common.c:107
memset include/linux/string.h:365 [inline]
ion_heap_clear_pages+0x49/0x70 drivers/staging/android/ion/ion_heap.c:106
ion_heap_sglist_zero+0x245/0x270 drivers/staging/android/ion/ion_heap.c:130
ion_heap_buffer_zero+0xf5/0x150 drivers/staging/android/ion/ion_heap.c:145
ion_system_heap_free+0x1eb/0x250
drivers/staging/android/ion/ion_system_heap.c:163
ion_buffer_destroy+0x159/0x2d0 drivers/staging/android/ion/ion.c:93
ion_heap_deferred_free+0x29d/0x630
drivers/staging/android/ion/ion_heap.c:239
kthread+0x361/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
CR2: fffff52000680000
---[ end trace 6d0e26662c48296a ]---
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:121 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:135 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:166 [inline]
RIP: 0010:check_memory_region_inline mm/kasan/generic.c:182 [inline]
RIP: 0010:check_memory_region+0x9c/0x1a0 mm/kasan/generic.c:192
Code: c9 4d 0f 49 c1 49 c1 f8 03 45 85 c0 0f 84 10 01 00 00 41 83 e8 01 4e
8d 44 c0 08 eb 0d 48 83 c0 08 4c 39 c0 0f 84 a7 00 00 00 <48> 83 38 00 74
ed 4c 8d 40 08 eb 09 48 83 c0 01 49 39 c0 74 53 80
RSP: 0018:ffffc9000cf87ab8 EFLAGS: 00010212
RAX: fffff52000680000 RBX: fffff52000681600 RCX: ffffffff85d95629
RDX: 0000000000000001 RSI: 000000000000b000 RDI: ffffc90003400000
RBP: ffffc9000cf87ad0 R08: fffff52000681600 R09: 0000000000001600
R10: fffff520006815ff R11: ffffc9000340afff R12: fffff52000680000
R13: 000000000000b000 R14: 0000000000000000 R15: ffffc9000cf87d08
FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffff52000680000 CR3: 00000000a6755000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

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