WARNING in ext4_dio_get_block

[upstream] WARNING in ext4_dio_get_block_overwrite
Status: upstream: reported on 2018/11/26 20:39
Reported-by: syzbot+9b095ee32c8a10c367dc@syzkaller.appspotmail.com
First: 54d, last: 7d08h

Sample crash report:

kernel msg: ebtables bug: please report to author: EBT_ENTRY_OR_ENTRIES shouldn't be set in distinguisher
audit: type=1804 audit(1547299808.470:3259): pid=9611 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor5" name="/root/syzkaller-testdir163477930/syzkaller.5OU4c0/1313/bus" dev="sda1" ino=17745 res=1
WARNING: CPU: 0 PID: 9608 at fs/ext4/inode.c:945 ext4_dio_get_block_overwrite fs/ext4/inode.c:945 [inline]
WARNING: CPU: 0 PID: 9608 at fs/ext4/inode.c:945 ext4_dio_get_block_overwrite+0xb7/0xf0 fs/ext4/inode.c:930
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 9608 Comm: syz-executor5 Not tainted 5.0.0-rc1+ #21
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+0x1db/0x2d0 lib/dump_stack.c:113
 panic+0x2cb/0x65c kernel/panic.c:214
 __warn.cold+0x20/0x48 kernel/panic.c:571
 report_bug+0x263/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 fixup_bug arch/x86/kernel/traps.c:173 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:290
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
RIP: 0010:ext4_dio_get_block_overwrite fs/ext4/inode.c:945 [inline]
RIP: 0010:ext4_dio_get_block_overwrite+0xb7/0xf0 fs/ext4/inode.c:930
Code: df 01 66 ff 84 db 74 1d e8 96 00 66 ff 49 8b 1c 24 31 ff 48 c1 eb 0c 83 e3 01 89 de e8 c2 01 66 ff 84 db 74 07 e8 79 00 66 ff <0f> 0b e8 72 00 66 ff 44 89 e8 5b 41 5c 41 5d 41 5e 5d c3 e8 61 00
RSP: 0018:ffff88820e58e9f0 EFLAGS: 00010246
RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc900063e6000
RDX: 0000000000040000 RSI: ffffffff821bf6e7 RDI: 0000000000000001
RBP: ffff88820e58ea10 R08: ffff88804d058080 R09: ffffed1012b31f12
R10: ffffed1012b31f11 R11: ffff88809598f88f R12: ffff88820e58ec70
R13: 0000000000000000 R14: 000000000000004b R15: 0000000000000001
 get_more_blocks fs/direct-io.c:716 [inline]
 do_direct_IO fs/direct-io.c:1001 [inline]
 do_blockdev_direct_IO+0x3822/0xdc10 fs/direct-io.c:1333
 __blockdev_direct_IO+0xa1/0xca fs/direct-io.c:1419
 ext4_direct_IO_write fs/ext4/inode.c:3775 [inline]
 ext4_direct_IO+0x142d/0x2090 fs/ext4/inode.c:3902
 generic_file_direct_write+0x214/0x4b0 mm/filemap.c:3111
 __generic_file_write_iter+0x2ee/0x630 mm/filemap.c:3290
 ext4_file_write_iter+0x37a/0x1410 fs/ext4/file.c:266
 call_write_iter include/linux/fs.h:1862 [inline]
 do_iter_readv_writev+0x902/0xbc0 fs/read_write.c:680
 do_iter_write fs/read_write.c:956 [inline]
 do_iter_write+0x184/0x610 fs/read_write.c:937
 vfs_iter_write+0x77/0xb0 fs/read_write.c:969
 iter_file_splice_write+0x885/0xfc0 fs/splice.c:749
 do_splice_from fs/splice.c:851 [inline]
 direct_splice_actor+0x126/0x1a0 fs/splice.c:1023
 splice_direct_to_actor+0x3be/0x9d0 fs/splice.c:978
 do_splice_direct+0x2c7/0x420 fs/splice.c:1066
 do_sendfile+0x61a/0xe60 fs/read_write.c:1436
 __do_sys_sendfile64 fs/read_write.c:1497 [inline]
 __se_sys_sendfile64 fs/read_write.c:1483 [inline]
 __x64_sys_sendfile64+0x1f8/0x240 fs/read_write.c:1483
 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457ec9
Code: 6d b7 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fe7c2e64c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457ec9
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000a5cc54d R11: 0000000000000246 R12: 00007fe7c2e656d4
R13: 00000000004c4cdc R14: 00000000004d85c0 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..

All crashes (6):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Maintainers
ci-upstream-kasan-gce-root	2019/01/12 13:30	upstream	4b3c31c8	c3f3344c	.config	log	report	adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, tytso@mit.edu
ci-upstream-kasan-gce-root	2019/01/12 13:08	upstream	4b3c31c8	c3f3344c	.config	log	report	adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, tytso@mit.edu
ci-upstream-kasan-gce-selinux-root	2019/01/12 12:58	upstream	4b3c31c8	c3f3344c	.config	log	report	adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, tytso@mit.edu
ci-upstream-kasan-gce-root	2019/01/01 05:28	upstream	f12e840c	3d85f48c	.config	log	report	adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, tytso@mit.edu
ci-upstream-kasan-gce-root	2018/12/07 21:17	upstream	b72f711a	1eb6a7e4	.config	log	report	adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, tytso@mit.edu
ci-upstream-linux-next-kasan-gce-root	2018/11/26 06:18	linux-next	442b8cea	3d3ec907	.config	log	report	adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, tytso@mit.edu