From: syzbot <syzbot+67e4f16db666b1c8253c@syzkaller.appspotmail.com>
To: a@unstable.cc, adilger.kernel@dilger.ca,
b.a.t.m.a.n@lists.open-mesh.org, benh@kernel.crashing.org,
davem@davemloft.net, linux-ext4@vger.kernel.org,
linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
mareklindner@neomailbox.ch, mpe@ellerman.id.au,
muriloo@linux.ibm.com, netdev@vger.kernel.org, paulus@samba.org,
sw@simonwunderlich.de, syzkaller-bugs@googlegroups.com,
tytso@mit.edu
Subject: WARNING in ext4_da_update_reserve_space
Date: Thu, 02 Apr 2020 04:02:11 -0700 [thread overview]
Message-ID: <0000000000008c5a4605a24cbb16@google.com> (raw)
Hello,
syzbot found the following crash on:
HEAD commit: 1a147b74 Merge branch 'DSA-mtu'
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=14237713e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=46ee14d4915944bc
dashboard link: https://syzkaller.appspot.com/bug?extid=67e4f16db666b1c8253c
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12237713e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10ec7c97e00000
The bug was bisected to:
commit 658b0f92bc7003bc734471f61bf7cd56339eb8c3
Author: Murilo Opsfelder Araujo <muriloo@linux.ibm.com>
Date: Wed Aug 1 21:33:15 2018 +0000
powerpc/traps: Print unhandled signals in a separate function
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15979f5be00000
final crash: https://syzkaller.appspot.com/x/report.txt?x=17979f5be00000
console output: https://syzkaller.appspot.com/x/log.txt?x=13979f5be00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+67e4f16db666b1c8253c@syzkaller.appspotmail.com
Fixes: 658b0f92bc70 ("powerpc/traps: Print unhandled signals in a separate function")
EXT4-fs warning (device sda1): ext4_da_update_reserve_space:344: ext4_da_update_reserve_space: ino 15722, used 1 with only 0 reserved data blocks
------------[ cut here ]------------
WARNING: CPU: 1 PID: 359 at fs/ext4/inode.c:348 ext4_da_update_reserve_space+0x622/0x7d0 fs/ext4/inode.c:344
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 359 Comm: kworker/u4:5 Not tainted 5.6.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x188/0x20d lib/dump_stack.c:118
panic+0x2e3/0x75c kernel/panic.c:221
__warn.cold+0x2f/0x35 kernel/panic.c:582
report_bug+0x27b/0x2f0 lib/bug.c:195
fixup_bug arch/x86/kernel/traps.c:174 [inline]
fixup_bug arch/x86/kernel/traps.c:169 [inline]
do_error_trap+0x12b/0x220 arch/x86/kernel/traps.c:267
do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286
invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:ext4_da_update_reserve_space+0x622/0x7d0 fs/ext4/inode.c:348
Code: 02 00 0f 85 94 01 00 00 48 8b 7d 28 49 c7 c0 20 72 3c 88 41 56 48 c7 c1 80 60 3c 88 53 ba 58 01 00 00 4c 89 c6 e8 1e 6d 0d 00 <0f> 0b 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 0f b6 04
RSP: 0018:ffffc90002197288 EFLAGS: 00010296
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff820bf066 RDI: fffff52000432e21
RBP: ffff888086b744c8 R08: 0000000000000091 R09: ffffed1015ce6659
R10: ffffed1015ce6658 R11: ffff8880ae7332c7 R12: 0000000000000001
R13: ffff888086b74990 R14: 0000000000000000 R15: ffff888086b74a40
ext4_ext_map_blocks+0x24aa/0x37d0 fs/ext4/extents.c:4500
ext4_map_blocks+0x4cb/0x1650 fs/ext4/inode.c:622
mpage_map_one_extent fs/ext4/inode.c:2365 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2418 [inline]
ext4_writepages+0x19eb/0x3080 fs/ext4/inode.c:2772
do_writepages+0xfa/0x2a0 mm/page-writeback.c:2344
__writeback_single_inode+0x12a/0x1410 fs/fs-writeback.c:1452
writeback_sb_inodes+0x515/0xdd0 fs/fs-writeback.c:1716
wb_writeback+0x2a5/0xd90 fs/fs-writeback.c:1892
wb_do_writeback fs/fs-writeback.c:2037 [inline]
wb_workfn+0x339/0x11c0 fs/fs-writeback.c:2078
process_one_work+0x94b/0x1690 kernel/workqueue.c:2266
worker_thread+0x96/0xe20 kernel/workqueue.c:2412
kthread+0x357/0x430 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..
---
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@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
next reply other threads:[~2020-04-02 11:23 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-02 11:02 syzbot [this message]
2020-04-02 14:06 ` WARNING in ext4_da_update_reserve_space Murilo Opsfelder Araújo
2020-04-02 14:31 ` Dmitry Vyukov
2020-04-04 18:37 ` Theodore Y. Ts'o
2020-04-04 22:13 ` syzbot
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