WARNING in unaccount_page_cache_page

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 399849e4 Linux 4.19.131
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=12c5d0a3100000
kernel config: https://syzkaller.appspot.com/x/.config?x=eada6d424d8bae1d
dashboard link: https://syzkaller.appspot.com/bug?extid=7e7c1e93437a32b54a56
compiler: gcc (GCC) 10.1.0-syz 20200507

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

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+7e7c1e...@syzkaller.appspotmail.com

minix_free_inode: bit 1 already cleared
WARNING: CPU: 0 PID: 18736 at mm/filemap.c:250 unaccount_page_cache_page+0x752/0xb80 mm/filemap.c:250
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 18736 Comm: syz-executor.3 Not tainted 4.19.131-syzkaller #0
MINIX-fs: mounting unchecked file system, running fsck is recommended
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+0x1fc/0x2fe lib/dump_stack.c:118
panic+0x26a/0x50e kernel/panic.c:186
9pnet: Insufficient options for proto=fd
__warn.cold+0x20/0x61 kernel/panic.c:541
report_bug+0x262/0x2b0 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+0x1d7/0x310 arch/x86/kernel/traps.c:296
MINIX-fs: mounting unchecked file system, running fsck is recommended
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:unaccount_page_cache_page+0x752/0xb80 mm/filemap.c:250
Code: c6 00 45 91 87 48 89 ef e8 6b 4a 0e 00 0f 0b e8 54 73 e6 ff 48 c7 c6 80 45 91 87 48 89 ef e8 55 4a 0e 00 0f 0b e8 3e 73 e6 ff <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02
RSP: 0018:ffff888041e5f7e8 EFLAGS: 00010012
RAX: 0000000000040000 RBX: 0000000000000001 RCX: ffffc9000c0ed000
RDX: 0000000000001d03 RSI: ffffffff81833502 RDI: 0000000000000007
RBP: ffffea0001382a40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880a3165be0 R14: ffffea000125fac8 R15: 0000000000000000
delete_from_page_cache_batch+0x191/0xcc0 mm/filemap.c:382
truncate_inode_pages_range+0x55c/0x1b10 mm/truncate.c:368
blk_ioctl_zeroout block/ioctl.c:261 [inline]
blkdev_ioctl+0xc1b/0x1a7e block/ioctl.c:530
block_ioctl+0xe9/0x130 fs/block_dev.c:1896
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:501 [inline]
do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705
__do_sys_ioctl fs/ioctl.c:712 [inline]
__se_sys_ioctl fs/ioctl.c:710 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45cb29
Code: 0d 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f94d9368c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e98a0 RCX: 000000000045cb29
RDX: 00000000200001c0 RSI: 000000000000127f RDI: 0000000000000004
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000409 R14: 00000000004c6d3a R15: 00007f94d93696d4
Kernel Offset: disabled
Rebooting in 86400 seconds..


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[syzbot]

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