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FDDI: defxx: Rate-limit memory allocation errors

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Prevent the system from becoming unstable or unusable due to a flood of
memory allocation error messages under memory pressure, e.g.:

[...]
fddi0: Could not allocate receive buffer.  Dropping packet.
fddi0: Could not allocate receive buffer.  Dropping packet.
fddi0: Could not allocate receive buffer.  Dropping packet.
fddi0: Could not allocate receive buffer.  Dropping packet.
rcu: INFO: rcu_sched self-detected stall on CPU
rcu: 	0-...!: (332 ticks this GP) idle=255c/1/0x40000000 softirq=16420123/16420123 fqs=0
rcu: 	(t=2103 jiffies g=35680089 q=4 ncpus=1)
rcu: rcu_sched kthread timer wakeup didn't happen for 2102 jiffies! g35680089 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=12779658
rcu: rcu_sched kthread starved for 2103 jiffies! g35680089 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: 	Unless rcu_sched kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_sched       state:I stack:0     pid:14    tgid:14    ppid:2      flags:0x00004000
Call Trace:
 __schedule+0x258/0x580
 schedule+0x19/0xa0
 schedule_timeout+0x4a/0xb0
 ? hrtimers_cpu_dying+0x1b0/0x1b0
 rcu_gp_fqs_loop+0xb1/0x450
 rcu_gp_kthread+0x9d/0x130
 kthread+0xb2/0xe0
 ? rcu_gp_init+0x4a0/0x4a0
 ? kthread_park+0x90/0x90
 ret_from_fork+0x2d/0x50
 ? kthread_park+0x90/0x90
 ret_from_fork_asm+0x12/0x20
 entry_INT80_32+0x10d/0x10d
CPU: 0 UID: 500 PID: 21895 Comm: 31370.exe Not tainted 6.13.0-dirty #2

(here running the libstdc++-v3 testsuite).

Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/alpine.DEB.2.21.2603291236590.60268@angie.orcam.me.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Maciej W. Rozycki
2026-03-29 13:32:25 +01:00
committed by Jakub Kicinski
parent f4ef5b1c13
commit 7fae661670
1 changed files with 1 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/fddi/defxx.c
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@@ -3182,7 +3182,7 @@ static void dfx_rcv_queue_process(
pkt_len + 3);
if (skb == NULL)
{
printk("%s: Could not allocate receive buffer. Dropping packet.\n", bp->dev->name);
printk_ratelimited("%s: Could not allocate receive buffer. Dropping packet.\n", bp->dev->name);
bp->rcv_discards++;
break;
}