linux-kernel - net test error: BUG: using smp_processor_id() in preemptible code in ext4_mb_new

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Message-ID: <00000000000025269c05a7e753d0@google.com>
Date:   Fri, 12 Jun 2020 11:34:17 -0700
From:   syzbot <syzbot+38af52cdcc116cee7742@...kaller.appspotmail.com>
To:     adilger.kernel@...ger.ca, davem@...emloft.net, kuba@...nel.org,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        tytso@....edu
Subject: net test error: BUG: using smp_processor_id() in preemptible code in ext4_mb_new_blocks

Hello,

syzbot found the following crash on:

HEAD commit:    18dbd4cd Merge branch 'net-ipa-endpoint-configuration-fixes'
git tree:       net
console output: https://syzkaller.appspot.com/x/log.txt?x=13f762ea100000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b366fd92adf6f8b4
dashboard link: https://syzkaller.appspot.com/bug?extid=38af52cdcc116cee7742
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+38af52cdcc116cee7742@...kaller.appspotmail.com

BUG: using smp_processor_id() in preemptible [00000000] code: systemd-rfkill/6838
caller is ext4_mb_new_blocks+0xa77/0x3b30 fs/ext4/mballoc.c:4711
CPU: 1 PID: 6838 Comm: systemd-rfkill Not tainted 5.7.0-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+0x188/0x20d lib/dump_stack.c:118
 check_preemption_disabled lib/smp_processor_id.c:47 [inline]
 debug_smp_processor_id.cold+0x88/0x9b lib/smp_processor_id.c:57
 ext4_mb_new_blocks+0xa77/0x3b30 fs/ext4/mballoc.c:4711
 ext4_ext_map_blocks+0x2044/0x3410 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:3627
 do_mkdirat+0x21e/0x280 fs/namei.c:3650
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x7fa2f1d24687
Code: 00 b8 ff ff ff ff c3 0f 1f 40 00 48 8b 05 09 d8 2b 00 64 c7 00 5f 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 d7 2b 00 f7 d8 64 89 01 48
RSP: 002b:00007fffeaa243a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00005638ed5e0985 RCX: 00007fa2f1d24687
RDX: 00007fffeaa24270 RSI: 00000000000001ed RDI: 00005638ed5e0985
RBP: 00007fa2f1d24680 R08: 0000000000000100 R09: 0000000000000000
R10: 00005638ed5e0980 R11: 0000000000000246 R12: 00000000000001ed
R13: 00007fffeaa24530 R14: 0000000000000000 R15: 0000000000000000


---
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