==================================================================
BUG: KMSAN: uninit-value in batadv_interface_tx+0x772/0x1e40 net/batman-adv/soft-interface.c:226
CPU: 1 PID: 9703 Comm: syz-executor.0 Not tainted 5.0.0-rc1+ #9
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+0x173/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x12e/0x2a0 mm/kmsan/kmsan.c:600
 __msan_warning+0x82/0xf0 mm/kmsan/kmsan_instr.c:313
 batadv_interface_tx+0x772/0x1e40 net/batman-adv/soft-interface.c:226
 __netdev_start_xmit include/linux/netdevice.h:4382 [inline]
 netdev_start_xmit include/linux/netdevice.h:4391 [inline]
 dev_direct_xmit+0x8a3/0xbb0 net/core/dev.c:3930
 packet_direct_xmit+0x256/0x3e0 net/packet/af_packet.c:246
 packet_snd net/packet/af_packet.c:2932 [inline]
 packet_sendmsg+0x79bb/0x9760 net/packet/af_packet.c:2957
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg net/socket.c:631 [inline]
 sock_write_iter+0x3f4/0x4d0 net/socket.c:900
 call_write_iter include/linux/fs.h:1862 [inline]
 aio_write+0x7cd/0xa60 fs/aio.c:1581
 __io_submit_one fs/aio.c:1860 [inline]
 io_submit_one+0x17de/0x3f90 fs/aio.c:1908
 __do_sys_io_submit fs/aio.c:1953 [inline]
 __se_sys_io_submit+0x2aa/0x660 fs/aio.c:1923
 __x64_sys_io_submit+0x4a/0x70 fs/aio.c:1923
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x457e29
Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffb659e4c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457e29
RDX: 0000000020000080 RSI: 0000000000000001 RDI: 00007ffb659c4000
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffb659e56d4
R13: 00000000004bf030 R14: 00000000004d0910 R15: 00000000ffffffff

Uninit was created at:
 kmsan_save_stack_with_flags+0x7a/0x130 mm/kmsan/kmsan.c:205
 kmsan_internal_alloc_meta_for_pages+0x113/0x580 mm/kmsan/kmsan_hooks.c:98
 kmsan_alloc_page+0x7e/0x100 mm/kmsan/kmsan_hooks.c:396
 __alloc_pages_nodemask+0x137b/0x5e30 mm/page_alloc.c:4572
 __alloc_pages include/linux/gfp.h:475 [inline]
 alloc_page_interleave mm/mempolicy.c:1988 [inline]
 alloc_pages_current+0x4a9/0x9b0 mm/mempolicy.c:2104
 alloc_pages include/linux/gfp.h:511 [inline]
 alloc_slab_page mm/slub.c:1492 [inline]
 allocate_slab mm/slub.c:1637 [inline]
 new_slab+0x3c6/0x20b0 mm/slub.c:1711
 new_slab_objects mm/slub.c:2465 [inline]
 ___slab_alloc+0x1577/0x2060 mm/slub.c:2617
 __slab_alloc mm/slub.c:2657 [inline]
 slab_alloc_node mm/slub.c:2720 [inline]
 slab_alloc mm/slub.c:2762 [inline]
 kmem_cache_alloc+0xae8/0xb60 mm/slub.c:2767
 mempool_alloc_slab+0x66/0xc0 mm/mempool.c:505
 mempool_init_node+0x50b/0xa40 mm/mempool.c:202
 mempool_init+0x102/0x120 mm/mempool.c:229
 mempool_init_slab_pool include/linux/mempool.h:62 [inline]
 bioset_init+0x989/0xd90 block/bio.c:1951
 extent_io_init+0x154/0x31d fs/btrfs/extent_io.c:166
 init_btrfs_fs+0xc4/0x47d fs/btrfs/super.c:2357
 do_one_initcall+0x557/0x9a0 init/main.c:891
 do_initcall_level+0x403/0x4be init/main.c:959
 do_initcalls init/main.c:967 [inline]
 do_basic_setup+0x5a/0x6b init/main.c:985
 kernel_init_freeable+0x24e/0x4af init/main.c:1138
 kernel_init+0x1f/0xb20 init/main.c:1058
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355
==================================================================