From: syzbot <syzbot+f02b92479b7065807a2a@syzkaller.appspotmail.com>
To: acme@kernel.org, alexander.shishkin@linux.intel.com,
andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org,
daniel@iogearbox.net, john.fastabend@gmail.com, jolsa@redhat.com,
kafai@fb.com, kpsingh@chromium.org, linux-kernel@vger.kernel.org,
mark.rutland@arm.com, mingo@redhat.com, namhyung@kernel.org,
netdev@vger.kernel.org, peterz@infradead.org,
songliubraving@fb.com, syzkaller-bugs@googlegroups.com,
yhs@fb.com
Subject: INFO: task can't die in perf_event_free_task
Date: Thu, 19 Nov 2020 07:42:23 -0800 [thread overview]
Message-ID: <0000000000000003ef05b477936c@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: 92edc4ae Add linux-next specific files for 20201113
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=15982d72500000
kernel config: https://syzkaller.appspot.com/x/.config?x=79ad4f8ad2d96176
dashboard link: https://syzkaller.appspot.com/bug?extid=f02b92479b7065807a2a
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=116fb7be500000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f02b92479b7065807a2a@syzkaller.appspotmail.com
INFO: task syz-executor.0:26152 can't die for more than 143 seconds.
task:syz-executor.0 state:D stack:28544 pid:26152 ppid: 8500 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:4269 [inline]
__schedule+0x890/0x2030 kernel/sched/core.c:5019
schedule+0xcf/0x270 kernel/sched/core.c:5098
perf_event_free_task+0x514/0x6b0 kernel/events/core.c:12605
copy_process+0x48e0/0x6f90 kernel/fork.c:2360
kernel_clone+0xe7/0xab0 kernel/fork.c:2462
__do_sys_clone+0xc8/0x110 kernel/fork.c:2579
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45deb9
Code: Unable to access opcode bytes at RIP 0x45de8f.
RSP: 002b:00007ffb605e6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000002040 RCX: 000000000045deb9
RDX: 9999999999999999 RSI: 0000000000000000 RDI: 0000000000000100
RBP: 000000000118bf70 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007fff8d97524f R14: 00007ffb605e79c0 R15: 000000000118bf2c
INFO: task syz-executor.0:26152 blocked for more than 143 seconds.
Not tainted 5.10.0-rc3-next-20201113-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:28544 pid:26152 ppid: 8500 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:4269 [inline]
__schedule+0x890/0x2030 kernel/sched/core.c:5019
schedule+0xcf/0x270 kernel/sched/core.c:5098
perf_event_free_task+0x514/0x6b0 kernel/events/core.c:12605
copy_process+0x48e0/0x6f90 kernel/fork.c:2360
kernel_clone+0xe7/0xab0 kernel/fork.c:2462
__do_sys_clone+0xc8/0x110 kernel/fork.c:2579
do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45deb9
Code: Unable to access opcode bytes at RIP 0x45de8f.
RSP: 002b:00007ffb605e6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000002040 RCX: 000000000045deb9
RDX: 9999999999999999 RSI: 0000000000000000 RDI: 0000000000000100
RBP: 000000000118bf70 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007fff8d97524f R14: 00007ffb605e79c0 R15: 000000000118bf2c
Showing all locks held in the system:
1 lock held by khungtaskd/1567:
#0: ffffffff8b339ce0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6252
1 lock held by in:imklog/8178:
#0: ffff88801c937c70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:932
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 1567 Comm: khungtaskd Not tainted 5.10.0-rc3-next-20201113-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x107/0x163 lib/dump_stack.c:120
nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline]
watchdog+0xd89/0xf30 kernel/hung_task.c:338
kthread+0x3af/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:111 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_idle_do_entry+0x1c9/0x250 drivers/acpi/processor_idle.c:517
---
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.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches
reply other threads:[~2020-11-19 15:42 UTC|newest]
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