linux-kernel - Re: [syzbot] [mm?] KCSAN: data-race in generic_fillattr / shmem

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Message-ID: <00000000000016108b0621960915@google.com>
Date: Sat, 07 Sep 2024 23:49:01 -0700
From: syzbot <syzbot+702361cf7e3d95758761@...kaller.appspotmail.com>
To: aha310510@...il.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [mm?] KCSAN: data-race in generic_fillattr / shmem_mknod (2)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KCSAN: data-race in ext4_fill_raw_inode / ext4_orphan_del

==================================================================
BUG: KCSAN: data-race in ext4_fill_raw_inode / ext4_orphan_del

write to 0xffff8881054ccdd4 of 4 bytes by task 3372 on cpu 1:
 ext4_orphan_del+0x54d/0x6e0 fs/ext4/orphan.c:296
 ext4_evict_inode+0xac3/0xdc0 fs/ext4/inode.c:289
 evict+0x2d7/0x560 fs/inode.c:704
 iput_final fs/inode.c:1838 [inline]
 iput+0x432/0x5c0 fs/inode.c:1864
 d_delete_notify include/linux/fsnotify.h:332 [inline]
 vfs_rmdir+0x29f/0x320 fs/namei.c:4306
 do_rmdir+0x194/0x320 fs/namei.c:4352
 __do_sys_unlinkat fs/namei.c:4528 [inline]
 __se_sys_unlinkat fs/namei.c:4522 [inline]
 __x64_sys_unlinkat+0xa2/0xb0 fs/namei.c:4522
 x64_sys_call+0x25fd/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x54/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e

read to 0xffff8881054ccdd4 of 4 bytes by task 3392 on cpu 0:
 ext4_fill_raw_inode+0x64b/0xe80 fs/ext4/inode.c:4348
 ext4_do_update_inode fs/ext4/inode.c:5151 [inline]
 ext4_mark_iloc_dirty+0x2e9/0xe10 fs/ext4/inode.c:5781
 __ext4_mark_inode_dirty+0x314/0x440 fs/ext4/inode.c:5985
 __ext4_ext_dirty fs/ext4/extents.c:202 [inline]
 ext4_ext_remove_space+0x28ca/0x2c80 fs/ext4/extents.c:3038
 ext4_ext_truncate+0xc4/0x150 fs/ext4/extents.c:4441
 ext4_truncate+0x773/0xb10 fs/ext4/inode.c:4218
 ext4_evict_inode+0x8b4/0xdc0 fs/ext4/inode.c:258
 evict+0x2d7/0x560 fs/inode.c:704
 iput_final fs/inode.c:1838 [inline]
 iput+0x432/0x5c0 fs/inode.c:1864
 d_delete_notify include/linux/fsnotify.h:332 [inline]
 vfs_rmdir+0x29f/0x320 fs/namei.c:4306
 do_rmdir+0x194/0x320 fs/namei.c:4352
 __do_sys_unlinkat fs/namei.c:4528 [inline]
 __se_sys_unlinkat fs/namei.c:4522 [inline]
 __x64_sys_unlinkat+0xa2/0xb0 fs/namei.c:4522
 x64_sys_call+0x25fd/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:264
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x54/0x120 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e

value changed: 0x0000079a -> 0x0000078b

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 3392 Comm: syz-executor.1 Not tainted 6.11.0-rc6-syzkaller-00326-gd1f2d51b711a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
==================================================================


Tested on:

commit:         d1f2d51b Merge tag 'clk-fixes-for-linus' of git://git...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=151e1ffb980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e81d40b0108ea8fe
dashboard link: https://syzkaller.appspot.com/bug?extid=702361cf7e3d95758761
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Note: no patches were applied.