BUG: unable to handle page fault for address: fffff52003000000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 21ffee067 P4D 21ffee067 PUD aa51c067 PMD a73df067 PTE 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 3673 Comm: ion_system_heap Not tainted 5.5.0-rc2-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:ffffc9000ccd7ab8 EFLAGS: 00010216 RAX: fffff52003000000 RBX: fffff52003002000 RCX: ffffffff85ded8c9 RDX: 0000000000000001 RSI: 0000000000010000 RDI: ffffc90018000000 RBP: ffffc9000ccd7ad0 R08: fffff52003002000 R09: 0000000000002000 R10: fffff52003001fff R11: ffffc9001800ffff R12: fffff52003000000 R13: 0000000000010000 R14: 0000000000000000 R15: ffffc9000ccd7d08 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffff52003000000 CR3: 000000008ed61000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: memset+0x24/0x40 mm/kasan/common.c:108 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: fffff52003000000 ---[ end trace 27de3989c49192dc ]--- 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:ffffc9000ccd7ab8 EFLAGS: 00010216 RAX: fffff52003000000 RBX: fffff52003002000 RCX: ffffffff85ded8c9 RDX: 0000000000000001 RSI: 0000000000010000 RDI: ffffc90018000000 RBP: ffffc9000ccd7ad0 R08: fffff52003002000 R09: 0000000000002000 R10: fffff52003001fff R11: ffffc9001800ffff R12: fffff52003000000 R13: 0000000000010000 R14: 0000000000000000 R15: ffffc9000ccd7d08 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffff52003000000 CR3: 000000008ed61000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400