From: syzbot <syzbot+7caa651776c38f7fed6c@syzkaller.appspotmail.com>
To: fweisbec@gmail.com, linux-kernel@vger.kernel.org,
mingo@kernel.org, mingo@redhat.com, netdev@vger.kernel.org,
rostedt@goodmis.org, syzkaller-bugs@googlegroups.com,
tglx@linutronix.de
Subject: Re: [syzbot] INFO: rcu detected stall in sys_bpf (5)
Date: Tue, 07 Dec 2021 05:58:29 -0800 [thread overview]
Message-ID: <0000000000009dee1a05d28ec4a1@google.com> (raw)
In-Reply-To: <000000000000a636fc05cee1e95b@google.com>
syzbot has found a reproducer for the following issue on:
HEAD commit: d5284dedccdb libbpf: Add doc comments in libbpf.h
git tree: bpf-next
console output: https://syzkaller.appspot.com/x/log.txt?x=157d0e55b00000
kernel config: https://syzkaller.appspot.com/x/.config?x=a262045c4c15a9e0
dashboard link: https://syzkaller.appspot.com/bug?extid=7caa651776c38f7fed6c
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=132f9da9b00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11e749a9b00000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7caa651776c38f7fed6c@syzkaller.appspotmail.com
hrtimer: interrupt took 34034 ns
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-....: (11003 ticks this GP) idle=21b/1/0x4000000000000000 softirq=8763/8765 fqs=5250
(t=10502 jiffies g=11285 q=14)
NMI backtrace for cpu 0
CPU: 0 PID: 6526 Comm: syz-executor734 Not tainted 5.15.0-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:1421
__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:htab_unlock_bucket kernel/bpf/hashtab.c:192 [inline]
RIP: 0010:htab_lru_map_update_elem+0x463/0x8c0 kernel/bpf/hashtab.c:1178
Code: 04 00 00 49 89 6d 08 e8 6b 8b ea ff 48 8b 74 24 28 48 b8 22 01 00 00 00 00 ad de 48 8b 7c 24 10 49 89 44 24 08 e8 2d f3 b0 07 <48> c7 c7 20 d4 93 89 e8 e1 23 ae 07 48 8b 54 24 18 48 b8 00 00 00
RSP: 0018:ffffc90000cd7a88 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88807efdc800 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffff8880218f2c00 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817e0a58 R11: 0000000000000000 R12: ffff8880218f2c40
R13: 000000000000000b R14: 0000000000000005 R15: 0000000000000001
bpf_map_update_value.isra.0+0x2e8/0x910 kernel/bpf/syscall.c:207
generic_map_update_batch+0x3f2/0x5b0 kernel/bpf/syscall.c:1396
bpf_map_do_batch+0x3d5/0x510 kernel/bpf/syscall.c:4207
__sys_bpf+0x2761/0x5f10 kernel/bpf/syscall.c:4682
__do_sys_bpf kernel/bpf/syscall.c:4722 [inline]
__se_sys_bpf kernel/bpf/syscall.c:4720 [inline]
__x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4720
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: 0033:0x7fa79bb49f29
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007ffdbbb21d88 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa79bb49f29
RDX: 0000000000000038 RSI: 0000000020000480 RDI: 000000000000001a
RBP: 0000000000000000 R08: 00007ffdbbb21f28 R09: 00007ffdbbb21f28
R10: 00007ffdbbb21f28 R11: 0000000000000246 R12: 00007fa79bb0d7b0
R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000
</TASK>
----------------
Code disassembly (best guess):
0: 04 00 add $0x0,%al
2: 00 49 89 add %cl,-0x77(%rcx)
5: 6d insl (%dx),%es:(%rdi)
6: 08 e8 or %ch,%al
8: 6b 8b ea ff 48 8b 74 imul $0x74,-0x74b70016(%rbx),%ecx
f: 24 28 and $0x28,%al
11: 48 b8 22 01 00 00 00 movabs $0xdead000000000122,%rax
18: 00 ad de
1b: 48 8b 7c 24 10 mov 0x10(%rsp),%rdi
20: 49 89 44 24 08 mov %rax,0x8(%r12)
25: e8 2d f3 b0 07 callq 0x7b0f357
* 2a: 48 c7 c7 20 d4 93 89 mov $0xffffffff8993d420,%rdi <-- trapping instruction
31: e8 e1 23 ae 07 callq 0x7ae2417
36: 48 8b 54 24 18 mov 0x18(%rsp),%rdx
3b: 48 rex.W
3c: b8 .byte 0xb8
3d: 00 00 add %al,(%rax)
prev parent reply other threads:[~2021-12-07 13:58 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-21 19:29 [syzbot] INFO: rcu detected stall in sys_bpf (5) syzbot
2021-12-07 13:58 ` syzbot [this message]
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=0000000000009dee1a05d28ec4a1@google.com \
--to=syzbot+7caa651776c38f7fed6c@syzkaller.appspotmail.com \
--cc=fweisbec@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@kernel.org \
--cc=mingo@redhat.com \
--cc=netdev@vger.kernel.org \
--cc=rostedt@goodmis.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.