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Date:   Mon, 8 Jun 2020 00:26:32 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     syzbot <syzbot+878f276b4892a4438f95@...kaller.appspotmail.com>
Cc:     adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-next@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, tytso@....edu
Subject: Re: linux-next test error: BUG: using smp_processor_id() in
 preemptible [ADDR] code: syz-fuzzer/6793

Hi syzbot,

On Sun, 07 Jun 2020 04:13:13 -0700 syzbot <syzbot+878f276b4892a4438f95@...kaller.appspotmail.com> wrote:
>
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    48f99181 Add linux-next specific files for 20200603
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=1006bca6100000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=365f706273eaf502
> dashboard link: https://syzkaller.appspot.com/bug?extid=878f276b4892a4438f95
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+878f276b4892a4438f95@...kaller.appspotmail.com
> 
> BUG: using smp_processor_id() in preemptible [00000000] code: syz-fuzzer/6793
> caller is ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
> CPU: 1 PID: 6793 Comm: syz-fuzzer Not tainted 5.7.0-next-20200603-syzkaller #0
> 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+0x18f/0x20d lib/dump_stack.c:118
>  check_preemption_disabled+0x20d/0x220 lib/smp_processor_id.c:48
>  ext4_mb_new_blocks+0xa4d/0x3b70 fs/ext4/mballoc.c:4711
>  ext4_ext_map_blocks+0x201b/0x33e0 fs/ext4/extents.c:4244
>  ext4_map_blocks+0x4cb/0x1640 fs/ext4/inode.c:626
>  ext4_getblk+0xad/0x520 fs/ext4/inode.c:833
>  ext4_bread+0x7c/0x380 fs/ext4/inode.c:883
>  ext4_append+0x153/0x360 fs/ext4/namei.c:67
>  ext4_init_new_dir fs/ext4/namei.c:2757 [inline]
>  ext4_mkdir+0x5e0/0xdf0 fs/ext4/namei.c:2802
>  vfs_mkdir+0x419/0x690 fs/namei.c:3632
>  do_mkdirat+0x21e/0x280 fs/namei.c:3655
>  do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:359
>  entry_SYSCALL_64_after_hwframe+0x44/0xa9
> RIP: 0033:0x4b02a0
> Code: Bad RIP value.
> RSP: 002b:000000c00004f4b8 EFLAGS: 00000212 ORIG_RAX: 0000000000000102
> RAX: ffffffffffffffda RBX: 000000c00002c000 RCX: 00000000004b02a0
> RDX: 00000000000001c0 RSI: 000000c000026960 RDI: ffffffffffffff9c
> RBP: 000000c00004f510 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000212 R12: ffffffffffffffff
> R13: 000000000000004c R14: 000000000000004b R15: 0000000000000100
> 
> 
> ---
> This bug is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@...glegroups.com.
> 
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.


#syz dup: linux-next test error: BUG: using smp_processor_id() in preemptible  [ADDR] code: syz-fuzzer/6792
-- 
Cheers,
Stephen Rothwell

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