Google syzbot reports:
BUG: sleeping function called from invalid context at
kernel/locking/mutex.c:938
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 0, name: swapper/1
1 lock held by swapper/1/0:
...
Call Trace:
<IRQ>
dump_stack+0x197/0x210
___might_sleep.cold+0x1fb/0x23e
__might_sleep+0x95/0x190
__mutex_lock+0xc5/0x13c0
mutex_lock_nested+0x16/0x20
tpk_write+0x5d/0x340
resync_tnc+0x1b6/0x320
call_timer_fn+0x1ac/0x780
run_timer_softirq+0x6c3/0x1790
__do_softirq+0x262/0x98c
irq_exit+0x19b/0x1e0
smp_apic_timer_interrupt+0x1a3/0x610
apic_timer_interrupt+0xf/0x20
</IRQ>
This patch fix it by using spinlock in process context instead of
mutex and having interrupt disabled in critical section.
Reported-by: [email protected]
Signed-off-by: Zhenzhong Duan <[email protected]>
---
drivers/char/ttyprintk.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/drivers/char/ttyprintk.c b/drivers/char/ttyprintk.c
index 4f24e46ebe7c..56db949a7b70 100644
--- a/drivers/char/ttyprintk.c
+++ b/drivers/char/ttyprintk.c
@@ -15,10 +15,11 @@
#include <linux/serial.h>
#include <linux/tty.h>
#include <linux/module.h>
+#include <linux/spinlock.h>
struct ttyprintk_port {
struct tty_port port;
- struct mutex port_write_mutex;
+ spinlock_t spinlock;
};
static struct ttyprintk_port tpk_port;
@@ -99,11 +100,12 @@ static int tpk_open(struct tty_struct *tty,
struct file *filp)
static void tpk_close(struct tty_struct *tty, struct file *filp)
{
struct ttyprintk_port *tpkp = tty->driver_data;
+ unsigned long flags;
- mutex_lock(&tpkp->port_write_mutex);
+ spin_lock_irqsave(&tpkp->spinlock, flags);
/* flush tpk_printk buffer */
tpk_printk(NULL, 0);
- mutex_unlock(&tpkp->port_write_mutex);
+ spin_unlock_irqrestore(&tpkp->spinlock, flags);
tty_port_close(&tpkp->port, tty, filp);
}
@@ -115,13 +117,14 @@ static int tpk_write(struct tty_struct *tty,
const unsigned char *buf, int count)
{
struct ttyprintk_port *tpkp = tty->driver_data;
+ unsigned long flags;
int ret;
/* exclusive use of tpk_printk within this tty */
- mutex_lock(&tpkp->port_write_mutex);
+ spin_lock_irqsave(&tpkp->spinlock, flags);
ret = tpk_printk(buf, count);
- mutex_unlock(&tpkp->port_write_mutex);
+ spin_unlock_irqrestore(&tpkp->spinlock, flags);
return ret;
}
@@ -171,7 +174,7 @@ static int __init ttyprintk_init(void)
{
int ret = -ENOMEM;
- mutex_init(&tpk_port.port_write_mutex);
+ spin_lock_init(&tpk_port.spinlock);
ttyprintk_driver = tty_alloc_driver(1,
TTY_DRIVER_RESET_TERMIOS |
--
2.23.0
On Wed, Dec 11, 2019 at 09:11:46PM +0800, Zhenzhong Duan wrote:
> Google syzbot reports:
> BUG: sleeping function called from invalid context at
> kernel/locking/mutex.c:938
> in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 0, name: swapper/1
> 1 lock held by swapper/1/0:
> ...
> Call Trace:
> <IRQ>
> dump_stack+0x197/0x210
> ___might_sleep.cold+0x1fb/0x23e
> __might_sleep+0x95/0x190
> __mutex_lock+0xc5/0x13c0
> mutex_lock_nested+0x16/0x20
> tpk_write+0x5d/0x340
> resync_tnc+0x1b6/0x320
> call_timer_fn+0x1ac/0x780
> run_timer_softirq+0x6c3/0x1790
> __do_softirq+0x262/0x98c
> irq_exit+0x19b/0x1e0
> smp_apic_timer_interrupt+0x1a3/0x610
> apic_timer_interrupt+0xf/0x20
> </IRQ>
>
> This patch fix it by using spinlock in process context instead of
> mutex and having interrupt disabled in critical section.
>
> Reported-by: [email protected]
> Signed-off-by: Zhenzhong Duan <[email protected]>
> ---
> drivers/char/ttyprintk.c | 15 +++++++++------
> 1 file changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/char/ttyprintk.c b/drivers/char/ttyprintk.c
> index 4f24e46ebe7c..56db949a7b70 100644
> --- a/drivers/char/ttyprintk.c
> +++ b/drivers/char/ttyprintk.c
> @@ -15,10 +15,11 @@
> #include <linux/serial.h>
> #include <linux/tty.h>
> #include <linux/module.h>
> +#include <linux/spinlock.h>
>
> struct ttyprintk_port {
> struct tty_port port;
> - struct mutex port_write_mutex;
> + spinlock_t spinlock;
> };
>
> static struct ttyprintk_port tpk_port;
> @@ -99,11 +100,12 @@ static int tpk_open(struct tty_struct *tty,
> struct file *filp)
> static void tpk_close(struct tty_struct *tty, struct file *filp)
> {
> struct ttyprintk_port *tpkp = tty->driver_data;
> + unsigned long flags;
>
> - mutex_lock(&tpkp->port_write_mutex);
> + spin_lock_irqsave(&tpkp->spinlock, flags);
> /* flush tpk_printk buffer */
> tpk_printk(NULL, 0);
> - mutex_unlock(&tpkp->port_write_mutex);
> + spin_unlock_irqrestore(&tpkp->spinlock, flags);
>
> tty_port_close(&tpkp->port, tty, filp);
> }
Hi,
This is the friendly patch-bot of Greg Kroah-Hartman. You have sent him
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created. Hopefully you will not take offence and will fix the problem
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thanks,
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