From: syzbot <syzbot+ee7d095f44a683a195f8@syzkaller.appspotmail.com>
To: fweisbec@gmail.com, linux-kernel@vger.kernel.org,
mingo@kernel.org, syzkaller-bugs@googlegroups.com,
tglx@linutronix.de
Subject: [syzbot] INFO: rcu detected stall in sys_mount (6)
Date: Mon, 27 Sep 2021 11:50:19 -0700 [thread overview]
Message-ID: <0000000000008ed76c05ccfe91ee@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: 5a5d008887b4 Add linux-next specific files for 20210924
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1187dccb300000
kernel config: https://syzkaller.appspot.com/x/.config?x=ae26deb010ccc26f
dashboard link: https://syzkaller.appspot.com/bug?extid=ee7d095f44a683a195f8
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=172aaf6f300000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12667317300000
Bisection is inconclusive: the issue happens on the oldest tested release.
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10149213300000
console output: https://syzkaller.appspot.com/x/log.txt?x=14149213300000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ee7d095f44a683a195f8@syzkaller.appspotmail.com
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-....: (10500 ticks this GP) idle=2bb/1/0x4000000000000000 softirq=9116/9116 fqs=5250
(t=10502 jiffies g=12025 q=441)
NMI backtrace for cpu 0
CPU: 0 PID: 6525 Comm: syz-executor604 Not tainted 5.15.0-rc2-next-20210924-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343
print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
rcu_pending kernel/rcu/tree.c:3878 [inline]
rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2597
update_process_times+0x16d/0x200 kernel/time/timer.c:1785
tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1428
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
__sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x60 kernel/kcov.c:197
Code: 81 e1 00 01 00 00 65 48 8b 14 25 40 70 02 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 ac 15 00 00 85 c0 74 2b 8b 82 88 15 00 00 <83> f8 02 75 20 48 8b 8a 90 15 00 00 8b 92 8c 15 00 00 48 8b 01 48
RSP: 0018:ffffc9000110f9a0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff888079718000 RSI: ffffffff828c91c6 RDI: 0000000000000003
RBP: ffffc90002081000 R08: 0000000000000000 R09: 0000000000000068
R10: ffffffff828c8e16 R11: 000000000000003f R12: ffff88806c93e600
R13: ffff888013f8b000 R14: dffffc0000000000 R15: ffff88806c93e650
ntfs_lookup_inode_by_name+0x1d26/0x34b0 fs/ntfs/dir.c:379
check_windows_hibernation_status+0xd9/0x740 fs/ntfs/super.c:1274
load_system_files fs/ntfs/super.c:1989 [inline]
ntfs_fill_super+0x62f4/0x84e0 fs/ntfs/super.c:2893
mount_bdev+0x34d/0x410 fs/super.c:1368
legacy_get_tree+0x105/0x220 fs/fs_context.c:610
vfs_get_tree+0x89/0x2f0 fs/super.c:1498
do_new_mount fs/namespace.c:2988 [inline]
path_mount+0x1320/0x1fa0 fs/namespace.c:3318
do_mount fs/namespace.c:3331 [inline]
__do_sys_mount fs/namespace.c:3539 [inline]
__se_sys_mount fs/namespace.c:3516 [inline]
__x64_sys_mount+0x27f/0x300 fs/namespace.c:3516
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f967e8db4fa
Code: 48 c7 c2 c0 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 a8 00 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd213ac388 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffd213ac3e0 RCX: 00007f967e8db4fa
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffd213ac3a0
RBP: 00007ffd213ac3a0 R08: 00007ffd213ac3e0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000286 R12: 0000000020001c28
R13: 0000000000000003 R14: 0000000000000004 R15: 0000000000000117
</TASK>
----------------
Code disassembly (best guess):
0: 81 e1 00 01 00 00 and $0x100,%ecx
6: 65 48 8b 14 25 40 70 mov %gs:0x27040,%rdx
d: 02 00
f: a9 00 01 ff 00 test $0xff0100,%eax
14: 74 0e je 0x24
16: 85 c9 test %ecx,%ecx
18: 74 35 je 0x4f
1a: 8b 82 ac 15 00 00 mov 0x15ac(%rdx),%eax
20: 85 c0 test %eax,%eax
22: 74 2b je 0x4f
24: 8b 82 88 15 00 00 mov 0x1588(%rdx),%eax
* 2a: 83 f8 02 cmp $0x2,%eax <-- trapping instruction
2d: 75 20 jne 0x4f
2f: 48 8b 8a 90 15 00 00 mov 0x1590(%rdx),%rcx
36: 8b 92 8c 15 00 00 mov 0x158c(%rdx),%edx
3c: 48 8b 01 mov (%rcx),%rax
3f: 48 rex.W
---
This report 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 issue. 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 issue, for details see:
https://goo.gl/tpsmEJ#testing-patches
reply other threads:[~2021-09-27 18:50 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=0000000000008ed76c05ccfe91ee@google.com \
--to=syzbot+ee7d095f44a683a195f8@syzkaller.appspotmail.com \
--cc=fweisbec@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@kernel.org \
--cc=syzkaller-bugs@googlegroups.com \
--cc=tglx@linutronix.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.