==================================================================
BUG: KMSAN: uninit-value in vmap_pte_range mm/vmalloc.c:153 [inline]
BUG: KMSAN: uninit-value in vmap_pmd_range mm/vmalloc.c:172 [inline]
BUG: KMSAN: uninit-value in vmap_pud_range mm/vmalloc.c:189 [inline]
BUG: KMSAN: uninit-value in vmap_p4d_range mm/vmalloc.c:206 [inline]
BUG: KMSAN: uninit-value in vmap_page_range_noflush+0x975/0xed0 mm/vmalloc.c:231
CPU: 0 PID: 7570 Comm: syz-executor0 Not tainted 4.19.0-rc4+ #66
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x306/0x460 lib/dump_stack.c:113
 kmsan_report+0x1a2/0x2e0 mm/kmsan/kmsan.c:917
 __msan_warning+0x7c/0xe0 mm/kmsan/kmsan_instr.c:500
 vmap_pte_range mm/vmalloc.c:153 [inline]
 vmap_pmd_range mm/vmalloc.c:172 [inline]
 vmap_pud_range mm/vmalloc.c:189 [inline]
 vmap_p4d_range mm/vmalloc.c:206 [inline]
 vmap_page_range_noflush+0x975/0xed0 mm/vmalloc.c:231
 vmap_page_range mm/vmalloc.c:244 [inline]
 map_vm_area+0x17d/0x1f0 mm/vmalloc.c:1344
 kmsan_vmap+0xf2/0x180 mm/kmsan/kmsan_hooks.c:250
 vmap+0x3a1/0x510 mm/vmalloc.c:1648
 ion_heap_map_kernel+0xa33/0xad0 drivers/staging/android/ion/ion_heap.c:48
 ion_buffer_kmap_get drivers/staging/android/ion/ion.c:146 [inline]
 ion_dma_buf_begin_cpu_access+0x2ba/0x9b0 drivers/staging/android/ion/ion.c:328
 dma_buf_begin_cpu_access drivers/dma-buf/dma-buf.c:810 [inline]
 dma_buf_ioctl+0x376/0x630 drivers/dma-buf/dma-buf.c:314
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0xcf3/0x2810 fs/ioctl.c:687
 ksys_ioctl fs/ioctl.c:702 [inline]
 __do_sys_ioctl fs/ioctl.c:709 [inline]
 __se_sys_ioctl+0x1da/0x270 fs/ioctl.c:707
 __x64_sys_ioctl+0x4a/0x70 fs/ioctl.c:707
 do_syscall_64+0xbe/0x100 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x457519
Code: 1d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f4f59e01c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457519
RDX: 0000000020000040 RSI: 0000000040086200 RDI: 0000000000000004
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4f59e026d4
R13: 00000000004bed50 R14: 00000000004cead0 R15: 00000000ffffffff

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:255 [inline]
 kmsan_internal_poison_shadow+0xc8/0x1d0 mm/kmsan/kmsan.c:180
 kmsan_kmalloc+0xa4/0x120 mm/kmsan/kmsan_hooks.c:104
 __kmalloc+0x14b/0x440 mm/slub.c:3789
 kmalloc include/linux/slab.h:518 [inline]
 kmsan_vmap+0x9b/0x180 mm/kmsan/kmsan_hooks.c:239
 vmap+0x3a1/0x510 mm/vmalloc.c:1648
 ion_heap_map_kernel+0xa33/0xad0 drivers/staging/android/ion/ion_heap.c:48
 ion_buffer_kmap_get drivers/staging/android/ion/ion.c:146 [inline]
 ion_dma_buf_begin_cpu_access+0x2ba/0x9b0 drivers/staging/android/ion/ion.c:328
 dma_buf_begin_cpu_access drivers/dma-buf/dma-buf.c:810 [inline]
 dma_buf_ioctl+0x376/0x630 drivers/dma-buf/dma-buf.c:314
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0xcf3/0x2810 fs/ioctl.c:687
 ksys_ioctl fs/ioctl.c:702 [inline]
 __do_sys_ioctl fs/ioctl.c:709 [inline]
 __se_sys_ioctl+0x1da/0x270 fs/ioctl.c:707
 __x64_sys_ioctl+0x4a/0x70 fs/ioctl.c:707
 do_syscall_64+0xbe/0x100 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
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