Hello, I use akpm branch of linux-next https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/tree/?h=akpm&id=05abc43724793827835728f4f25ba827e1c54902 . This bug is reproduced, when I do the following sequence of commands: mkdir /sys/fs/cgroup/memory/xxx echo 1024000000 > /sys/fs/cgroup/memory/xxx/memory.kmem.limit_in_bytes echo $$ > /sys/fs/cgroup/memory/xxx/tasks find /proc -name abra-kadabra echo $$ > /sys/fs/cgroup/memory/tasks rmdir /sys/fs/cgroup/memory/xxx/ echo 3 > /proc/sys/vm/drop_caches [ 88.636551] ------------[ cut here ]------------ [ 88.638012] WARNING: CPU: 1 PID: 350 at lib/list_debug.c:62 __list_del_entry+0x82/0xd0() [ 88.639488] list_del corruption. next->prev should be ffff8800b567f588, but was ffff8800b8b83688 [ 88.641274] Modules linked in: binfmt_misc ip6table_filter ip6_tables iptable_filter ip_tables pcspkr virtio_balloon virtio_net i2c_piix4 i2c_core floppy [ 88.644445] CPU: 1 PID: 350 Comm: bash Not tainted 3.11.0-rc4+ #35 [ 88.647081] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 88.648926] 0000000000000009 ffff880037a6dc10 ffffffff816480dd ffff880037a6dc58 [ 88.651832] ffff880037a6dc48 ffffffff8105753d ffff8800b8602630 ffff8800b8602000 [ 88.654598] 0000000000000001 ffff8800b88b8588 ffff8800b567f588 ffff880037a6dca8 [ 88.656581] Call Trace: [ 88.657197] [<ffffffff816480dd>] dump_stack+0x45/0x56 [ 88.658293] [<ffffffff8105753d>] warn_slowpath_common+0x7d/0xa0 [ 88.659444] [<ffffffff810575ac>] warn_slowpath_fmt+0x4c/0x50 [ 88.660549] [<ffffffff8130ac42>] __list_del_entry+0x82/0xd0 [ 88.661622] [<ffffffff8125e8fb>] __ext4_es_shrink+0x23b/0x2b0 [ 88.662734] [<ffffffff8125ea19>] ext4_es_scan+0xa9/0x100 [ 88.663794] [<ffffffff81142ebf>] shrink_slab+0x1cf/0x380 [ 88.666224] [<ffffffff811f821b>] drop_caches_sysctl_handler+0xab/0xe0 [ 88.667683] [<ffffffff8120da03>] proc_sys_call_handler+0xb3/0xc0 [ 88.668924] [<ffffffff8120da24>] proc_sys_write+0x14/0x20 [ 88.670001] [<ffffffff8119a2dd>] vfs_write+0xbd/0x1e0 [ 88.671014] [<ffffffff8119ad1c>] SyS_write+0x4c/0xa0 [ 88.671976] [<ffffffff81659f99>] system_call_fastpath+0x16/0x1b [ 88.673039] ---[ end trace 9d815cd93e122801 ]--- Then the kernel reports BUG-s about soft lockup and the system hans up. [ 116.077005] BUG: soft lockup - CPU#0 stuck for 23s! [jbd2/sda3-8:114] [ 116.077005] Modules linked in: binfmt_misc ip6table_filter ip6_tables iptable_filter ip_tables pcspkr virtio_balloon virtio_net i2c_piix4 i2c_core floppy [ 116.077005] irq event stamp: 6420 [ 116.077005] hardirqs last enabled at (6419): [<ffffffff81650f16>] _raw_spin_unlock_irqrestore+0x36/0x60 [ 116.077005] hardirqs last disabled at (6420): [<ffffffff81650e3d>] _raw_spin_lock_irq+0x1d/0x50 [ 116.077005] softirqs last enabled at (5776): [<ffffffff8105cdd7>] __do_softirq+0x197/0x260 [ 116.077005] softirqs last disabled at (5761): [<ffffffff8105d065>] irq_exit+0xc5/0xd0 [ 116.077005] CPU: 0 PID: 114 Comm: jbd2/sda3-8 Tainted: G W 3.11.0-rc4+ #35 [ 116.077005] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 116.077005] task: ffff8800b8580000 ti: ffff880037bb0000 task.ti: ffff880037bb0000 [ 116.077005] RIP: 0010:[<ffffffff81009bb0>] [<ffffffff81009bb0>] hw_breakpoint_pmu_read+0x10/0x10 [ 116.077005] RSP: 0018:ffff880037bb18e0 EFLAGS: 00000202 [ 116.077005] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 116.077005] RDX: 000000000000cccb RSI: 0000000000000000 RDI: 0000000000000001 [ 116.099005] BUG: soft lockup - CPU#1 stuck for 23s! [bash:350] [ 116.099005] Modules linked in: binfmt_misc ip6table_filter ip6_tables iptable_filter ip_tables pcspkr virtio_balloon virtio_net i2c_piix4 i2c_core floppy [ 116.099005] irq event stamp: 0 [ 116.099005] hardirqs last enabled at (0): [< (null)>] (null) [ 116.099005] hardirqs last disabled at (0): [<ffffffff81055586>] copy_process.part.25+0x5d6/0x1590 [ 116.099005] softirqs last enabled at (0): [<ffffffff81055586>] copy_process.part.25+0x5d6/0x1590 [ 116.099005] softirqs last disabled at (0): [< (null)>] (null) [ 116.099005] CPU: 1 PID: 350 Comm: bash Tainted: G W 3.11.0-rc4+ #35 [ 116.099005] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 116.099005] task: ffff88003782a030 ti: ffff880037a6c000 task.ti: ffff880037a6c000 [ 116.099005] RIP: 0010:[<ffffffff8125e7a6>] [<ffffffff8125e7a6>] __ext4_es_shrink+0xe6/0x2b0 [ 116.099005] RSP: 0018:ffff880037a6dcc8 EFLAGS: 00000212 [ 116.099005] RAX: ffff8800b567f588 RBX: ffffffff81651a73 RCX: 0000100000000000 [ 116.099005] RDX: 0000000000000020 RSI: 0000000000000000 RDI: 0000000000000000 [ 116.099005] RBP: ffff880037a6dd38 R08: 0000000000000002 R09: 0000000000000000 [ 116.099005] R10: 0000000000000000 R11: 0000000000000000 R12: ffff880037a6dc38 [ 116.099005] R13: ffff88003782a030 R14: ffff880037a6c000 R15: 0140000000000001 [ 116.099005] FS: 00007fc20d80f740(0000) GS:ffff8800bfb00000(0000) knlGS:0000000000000000 [ 116.099005] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 116.099005] CR2: 00007f1152f09000 CR3: 0000000037927000 CR4: 00000000000006e0 [ 116.099005] Stack: [ 116.099005] ffff8800b86026c0 0000000081c686f8 0000000000000000 0000000000000000 [ 116.099005] ffff880000000001 ffff8800b567bd50 0000000000000080 ffff880037a6dd00 [ 116.099005] ffff880037a6dd00 0000000000000020 0000000000000080 ffff8800b8601000 [ 116.099005] Call Trace: [ 116.099005] [<ffffffff8125ea19>] ext4_es_scan+0xa9/0x100 [ 116.099005] [<ffffffff81142ebf>] shrink_slab+0x1cf/0x380 [ 116.099005] [<ffffffff811f821b>] drop_caches_sysctl_handler+0xab/0xe0 [ 116.099005] [<ffffffff8120da03>] proc_sys_call_handler+0xb3/0xc0 [ 116.099005] [<ffffffff8120da24>] proc_sys_write+0x14/0x20 [ 116.099005] [<ffffffff8119a2dd>] vfs_write+0xbd/0x1e0 [ 116.099005] [<ffffffff8119ad1c>] SyS_write+0x4c/0xa0 [ 116.099005] [<ffffffff81659f99>] system_call_fastpath+0x16/0x1b [ 116.099005] Code: c4 01 e8 3e c4 0a 00 48 8b 75 d0 48 8d 55 c8 4c 89 ff e8 6e c3 0a 00 4c 39 f3 49 8b 06 0f 84 92 00 00 00 49 8b 94 24 80 06 00 00 <48> 85 d2 0f 8e 81 00 00 00 4d 89 f7 49 89 c6 49 8b 47 18 49 39 -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
