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Subject[ANNOUNCE] 4.4.220-rt196
Date
Hello RT-list!

I'm pleased to announce the 4.4.220-rt196 stable release.

This release is just an update to the new stable 4.4.215 version
and no RT specific changes have been made.

Known issues:

I've updated my test setup and during all rt-tests there is now a
background workload running. sigwaittest with hackbench as workload is
able to trigger a crash on x86_64 but not on ARMv7. It's not clear if
this existed for a longer period already or if it's new.

[ 41.148863] BUG: unable to handle kernel paging request at 00000000ffffffff
[ 41.148871] IP: [<ffffffff8118fce3>] kmem_cache_alloc_node+0xc3/0x1e0
[ 41.148873] PGD 0
[ 41.148874] Oops: 0000 [#1] PREEMPT SMP
[ 41.148877] Modules linked in:
[ 41.148879] CPU: 1 PID: 4394 Comm: hackbench Not tainted 4.4.220-rt195+ #9
[ 41.148880] Hardware name: wortmann G31M-ES2L/G31M-S2L, BIOS F10 09/29/2009
[ 41.148881] task: ffff8800ca89a7c0 ti: ffff8800cb39c000 task.ti: ffff8800cb39c000
[ 41.148884] RIP: 0010:[<ffffffff8118fce3>] [<ffffffff8118fce3>] kmem_cache_alloc_node+0xc3/0x1e0
[ 41.148885] RSP: 0018:ffff8800cb39fbd8 EFLAGS: 00010246
[ 41.148886] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000005021c81
[ 41.148886] RDX: 0000000005021c41 RSI: 0000000005021c41 RDI: 00000000000186e0
[ 41.148887] RBP: ffff8800cb39fc18 R08: ffffffff8172abcb R09: 0000000000000003
[ 41.148888] R10: 0000000000000000 R11: 0000000000000246 R12: ffff88012b001700
[ 41.148888] R13: 00000000ffffffff R14: 00000000ffffffff R15: 00000000024004c0
[ 41.148889] FS: 00007fe50befd740(0000) GS:ffff88012fc80000(0000) knlGS:0000000000000000
[ 41.148890] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 41.148891] CR2: 00000000ffffffff CR3: 00000000c8562000 CR4: 0000000000040670
[ 41.148891] Stack:
[ 41.148893] ffffea0003137ec0 ffffea00031b62c0 ffffffff8172abcb 0000000000000001
[ 41.148895] ffff8800cb39fd00 ffff88012b001700 0000000000000000 00000000024004c0
[ 41.148896] ffff8800cb39fc60 ffffffff8172abcb ffffffff024200ca ffff8800cb3a0000
[ 41.148897] Call Trace:
[ 41.148901] [<ffffffff8172abcb>] ? __alloc_skb+0x4b/0x1c0
[ 41.148903] [<ffffffff8172abcb>] __alloc_skb+0x4b/0x1c0
[ 41.148904] [<ffffffff8172ad9e>] alloc_skb_with_frags+0x5e/0x1d0
[ 41.148906] [<ffffffff8172682d>] sock_alloc_send_pskb+0x1bd/0x1e0
[ 41.148909] [<ffffffff81805a84>] unix_stream_sendmsg+0x244/0x390
[ 41.148912] [<ffffffff81722530>] sock_sendmsg+0x40/0x50
[ 41.148914] [<ffffffff817225bf>] sock_write_iter+0x7f/0xd0
[ 41.148917] [<ffffffff81199eb8>] __vfs_write+0xb8/0xf0
[ 41.148918] [<ffffffff8119a98a>] vfs_write+0xba/0x1d0
[ 41.148920] [<ffffffff8119b61f>] SyS_write+0x4f/0xd0
[ 41.148923] [<ffffffff8192f1ca>] entry_SYSCALL_64_fastpath+0x1e/0x93
[ 41.148939] Code: 00 00 74 51 48 85 c0 0f 84 2c 01 00 00 49 63 54 24 1c 31 f6 4c 89 ef e8 9c c7 1e 00 eb 37 49 63 44 24 20 49 8b 3c 24 48 8d 4a 40 <49> 8b 5c 05 00 4c 89 e8 65 48 0f c7 0f 0f 94 c0 84 c0 0f 84 64
[ 41.148940] RIP [<ffffffff8118fce3>] kmem_cache_alloc_node+0xc3/0x1e0
[ 41.148941] RSP <ffff8800cb39fbd8>
[ 41.148941] CR2: 00000000ffffffff
[ 41.384003] ---[ end trace 0000000000000002 ]---


You can get this release via the git tree at:

git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git

branch: v4.4-rt
Head SHA1: 2a1573bd8805c11aa1cce2998bc55396633e596b

Or to build 4.4.220-rt196 directly, the following patches should be applied:

https://www.kernel.org/pub/linux/kernel/v4.x/linux-4.4.tar.xz

https://www.kernel.org/pub/linux/kernel/v4.x/patch-4.4.220.xz

https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/patch-4.4.220-rt196.patch.xz


You can also build from 4.4.215-rt192 by applying the incremental patch:

https://www.kernel.org/pub/linux/kernel/projects/rt/4.4/incr/patch-4.4.215-rt192-rt196.patch.xz

Enjoy!
Daniel

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