audit: type=1400 audit(1541638040.925:12): avc:  denied  { read } for  pid=3717 comm="syz-executor0" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
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kernel BUG at fs/ext4/inode.c:2618!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 3746 Comm: syz-executor5 Not tainted 4.9.135+ #115
task: ffff8801a7fbaf80 task.stack: ffff8801a7f30000
RIP: 0010:[<ffffffff816c4ee9>]  [<ffffffff816c4ee9>] mpage_prepare_extent_to_map+0x719/0x9a0 fs/ext4/inode.c:2618
RSP: 0018:ffff8801a7f372d8  EFLAGS: 00010216
RAX: 0000000000040000 RBX: ffffea00069e15c0 RCX: ffffc9000196f000
RDX: 0000000000010d57 RSI: ffffffff816c4ee9 RDI: ffffea00069e15d0
RBP: ffff8801a7f37498 R08: ffff8801a7fbb830 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 00000000000000a1 R14: dffffc0000000000 R15: ffff8801a7f37600
FS:  00007fb3c43ba700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ef36000 CR3: 00000001c51a5000 CR4: 00000000001606b0
Stack:
 1ffff10034fe6e6a ffff8801a7f37370 ffff8801a7f37608 ffff8801a7f37610
 00000002a7f37498 000000000007fffe ffff8801d4559408 0000000e0000000c
 7fffffffffffff5f ffff8801a7f373b0 ffff8801a7f37618 ffffed0034fe6ec1
Call Trace:
 [<ffffffff816d587e>] ext4_writepages+0xeee/0x2e00 fs/ext4/inode.c:2780
 [<ffffffff81433c8f>] do_writepages+0xef/0x1d0 mm/page-writeback.c:2331
 [<ffffffff814119a9>] __filemap_fdatawrite_range+0x1a9/0x250 mm/filemap.c:390
 [<ffffffff81411c79>] filemap_write_and_wait_range+0x59/0xb0 mm/filemap.c:578
 [<ffffffff81413676>] generic_file_read_iter+0x776/0x1a80 mm/filemap.c:1957
 [<ffffffff815aacad>] generic_file_splice_read+0x2bd/0x4e0 fs/splice.c:309
 [<ffffffff815ab32c>] do_splice_to+0x10c/0x170 fs/splice.c:899
 [<ffffffff815ab5cf>] splice_direct_to_actor+0x23f/0x7e0 fs/splice.c:971
 [<ffffffff815abd13>] do_splice_direct+0x1a3/0x270 fs/splice.c:1080
 [<ffffffff8150d770>] do_sendfile+0x4f0/0xc30 fs/read_write.c:1393
 [<ffffffff8150f7e1>] SYSC_sendfile64 fs/read_write.c:1448 [inline]
 [<ffffffff8150f7e1>] SyS_sendfile64+0xd1/0x160 fs/read_write.c:1440
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff82816b93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: fc ff ff 48 89 95 b0 fe ff ff e8 13 66 c5 ff 48 8b 95 b0 fe ff ff 48 8d 42 ff e9 6f ff ff ff e8 fe 65 c5 ff 0f 0b e8 f7 65 c5 ff <0f> 0b 31 c0 89 85 b0 fe ff ff e8 e8 65 c5 ff 8b 85 18 ff ff ff 
RIP  [<ffffffff816c4ee9>] mpage_prepare_extent_to_map+0x719/0x9a0 fs/ext4/inode.c:2618
 RSP <ffff8801a7f372d8>
---[ end trace 2c8485e39df394e0 ]---