general protection fault in vma_interval_tree_subtree_search

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: c70672d8 Merge tag 's390-5.9-5' of git://git.kernel.org/pu..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10981e95900000
kernel config: https://syzkaller.appspot.com/x/.config?x=bd46548257448703
dashboard link: https://syzkaller.appspot.com/bug?extid=8aca78049d4171aea0a8
compiler: gcc (GCC) 10.1.0-syz 20200507
CC: [ak...@linux-foundation.org linux-...@vger.kernel.org linu...@kvack.org]

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8aca78...@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc00000000e3: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000718-0x000000000000071f]
CPU: 1 PID: 29947 Comm: kworker/u4:2 Not tainted 5.9.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-8:0)
RIP: 0010:vma_interval_tree_subtree_search+0x51/0x1d0 mm/interval_tree.c:23
Code: 89 f8 48 c1 e8 03 42 80 3c 20 00 0f 85 4c 01 00 00 4c 8b 6b 68 4d 85 ed 74 33 e8 da 4f d2 ff 49 8d 7d 18 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 64 01 00 00 4d 8b 75 18 48 89 ee 4c 89 f7 e8
RSP: 0018:ffffc90006096fa0 EFLAGS: 00010203
RAX: 00000000000000e3 RBX: ffff88800010ed68 RCX: ffffffff81a21544
RDX: ffff88803b186380 RSI: ffffffff81a1fb26 RDI: 000000000000071f
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffea00017b69c7
R10: 0000000000000000 R11: 000000000000016e R12: dffffc0000000000
R13: 0000000000000707 R14: dffffc0000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000562893542288 CR3: 0000000053224000 CR4: 00000000001526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
vma_interval_tree_iter_next+0x1ad/0x210 mm/interval_tree.c:23
rmap_walk_file+0x5cd/0xbf0 mm/rmap.c:1919
rmap_walk+0x105/0x190 mm/rmap.c:1946
page_mkclean+0x21c/0x2b0 mm/rmap.c:998
clear_page_dirty_for_io+0x31f/0x920 mm/page-writeback.c:2698
mpage_submit_page+0x80/0x2c0 fs/ext4/inode.c:2061
mpage_process_page_bufs+0x656/0x780 fs/ext4/inode.c:2195
mpage_prepare_extent_to_map+0x8fa/0xde0 fs/ext4/inode.c:2607
ext4_writepages+0x90f/0x3960 fs/ext4/inode.c:2735
do_writepages+0xec/0x290 mm/page-writeback.c:2352
__writeback_single_inode+0x125/0x1400 fs/fs-writeback.c:1461
writeback_sb_inodes+0x53d/0xf40 fs/fs-writeback.c:1721
wb_writeback+0x2ad/0xd40 fs/fs-writeback.c:1894
wb_do_writeback fs/fs-writeback.c:2039 [inline]
wb_workfn+0x2dc/0x13e0 fs/fs-writeback.c:2080
process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
kthread+0x3b5/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Modules linked in:
---[ end trace 15ab77fb9895c0cc ]---
RIP: 0010:vma_interval_tree_subtree_search+0x51/0x1d0 mm/interval_tree.c:23
Code: 89 f8 48 c1 e8 03 42 80 3c 20 00 0f 85 4c 01 00 00 4c 8b 6b 68 4d 85 ed 74 33 e8 da 4f d2 ff 49 8d 7d 18 48 89 f8 48 c1 e8 03 <42> 80 3c 20 00 0f 85 64 01 00 00 4d 8b 75 18 48 89 ee 4c 89 f7 e8
RSP: 0018:ffffc90006096fa0 EFLAGS: 00010203
RAX: 00000000000000e3 RBX: ffff88800010ed68 RCX: ffffffff81a21544
RDX: ffff88803b186380 RSI: ffffffff81a1fb26 RDI: 000000000000071f
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffea00017b69c7
R10: 0000000000000000 R11: 000000000000016e R12: dffffc0000000000
R13: 0000000000000707 R14: dffffc0000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff968acb000 CR3: 0000000093e2d000 CR4: 00000000001526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.