From: Jeff Layton <jlayton@xxxxxxxxxxxxxxx> Date: Wed, 10 Jun 2015 21:02:04 -0400 > From: Mel Gorman <mgorman@xxxxxxx> > > Jeff Layton reported the following; > > [ 74.232485] ------------[ cut here ]------------ > [ 74.233354] WARNING: CPU: 2 PID: 754 at net/core/sock.c:364 sk_clear_memalloc+0x51/0x80() > [ 74.234790] Modules linked in: cts rpcsec_gss_krb5 nfsv4 dns_resolver nfs fscache xfs libcrc32c snd_hda_codec_generic snd_hda_intel snd_hda_controller snd_hda_codec snd_hda_core snd_hwdep snd_seq snd_seq_device nfsd snd_pcm snd_timer snd e1000 ppdev parport_pc joydev parport pvpanic soundcore floppy serio_raw i2c_piix4 pcspkr nfs_acl lockd virtio_balloon acpi_cpufreq auth_rpcgss grace sunrpc qxl drm_kms_helper ttm drm virtio_console virtio_blk virtio_pci ata_generic virtio_ring pata_acpi virtio > [ 74.243599] CPU: 2 PID: 754 Comm: swapoff Not tainted 4.1.0-rc6+ #5 > [ 74.244635] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 > [ 74.245546] 0000000000000000 0000000079e69e31 ffff8800d066bde8 ffffffff8179263d > [ 74.246786] 0000000000000000 0000000000000000 ffff8800d066be28 ffffffff8109e6fa > [ 74.248175] 0000000000000000 ffff880118d48000 ffff8800d58f5c08 ffff880036e380a8 > [ 74.249483] Call Trace: > [ 74.249872] [<ffffffff8179263d>] dump_stack+0x45/0x57 > [ 74.250703] [<ffffffff8109e6fa>] warn_slowpath_common+0x8a/0xc0 > [ 74.251655] [<ffffffff8109e82a>] warn_slowpath_null+0x1a/0x20 > [ 74.252585] [<ffffffff81661241>] sk_clear_memalloc+0x51/0x80 > [ 74.253519] [<ffffffffa0116c72>] xs_disable_swap+0x42/0x80 [sunrpc] > [ 74.254537] [<ffffffffa01109de>] rpc_clnt_swap_deactivate+0x7e/0xc0 [sunrpc] > [ 74.255610] [<ffffffffa03e4fd7>] nfs_swap_deactivate+0x27/0x30 [nfs] > [ 74.256582] [<ffffffff811e99d4>] destroy_swap_extents+0x74/0x80 > [ 74.257496] [<ffffffff811ecb52>] SyS_swapoff+0x222/0x5c0 > [ 74.258318] [<ffffffff81023f27>] ? syscall_trace_leave+0xc7/0x140 > [ 74.259253] [<ffffffff81798dae>] system_call_fastpath+0x12/0x71 > [ 74.260158] ---[ end trace 2530722966429f10 ]--- > > The warning in question was unnecessary but with Jeff's series the rules > are also clearer. This patch removes the warning and updates the comment > to explain why sk_mem_reclaim() may still be called. > > [jlayton: remove if (sk->sk_forward_alloc) conditional. As Leon > points out that it's not needed.] > > Cc: Leon Romanovsky <leon@xxxxxxx> > Signed-off-by: Mel Gorman <mgorman@xxxxxxx> > Signed-off-by: Jeff Layton <jeff.layton@xxxxxxxxxxxxxxx> Applied, thanks everyone. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>