My F13 system was completely stable on F13 with intel_iommu=off, but recently (new kernel, maybe), X hangs every couple days.  It usually happens which browsing the web.

When this happens, the mouse still moves, but the keyboard doesn't work.  ssh into the machine is fine.  dmesg says:

[drm] nouveau 0000:04:00.0: PFIFO_DMA_PUSHER - Ch 2

X takes 100% CPU, and strace says:


ioctl(8, 0x40086482, 0x7fff1ca83cb0)    = ? ERESTARTSYS (To be restarted)
--- SIGALRM (Alarm clock) @ 0 (0) ---
rt_sigreturn(0xe)                       = -1 EINTR (Interrupted system call)

and repeats apparently forever.  Moving the mouse makes X do this:

select(44, [11 12 13 14 42 43], NULL, NULL, {0, 0}) = 1 (in [42], left {0, 0})
read(42, "\262\337\177L\0\0\0\0\263P\16\0\0\0\0\0\2\0\0\0\377\377\377\377\262\337\177L\0\0\0\0"..., 384) = 72
ioctl(8, 0xc01c64a3, 0x7fff1ca831f0)    = 0
rt_sigreturn(0x3139ad8)                 = -1 EINTR (Interrupted system call)
ioctl(8, 0x40086482, 0x7fff1ca83cb0)    = ? ERESTARTSYS (To be restarted)
--- SIGALRM (Alarm clock) @ 0 (0) ---
rt_sigreturn(0xe)                       = -1 EINTR (Interrupted system call)
ioctl(8, 0x40086482, 0x7fff1ca83cb0)    = ? ERESTARTSYS (To be restarted)
--- SIGIO (I/O possible) @ 0 (0) ---
select(44, [11 12 13 14 42 43], NULL, NULL, {0, 0}) = 1 (in [42], left {0, 0})
read(42, "\262\337\177L\0\0\0\0\350o\16\0\0\0\0\0\2\0\0\0\1\0\0\0\262\337\177L\0\0\0\0"..., 384) = 48
ioctl(8, 0xc01c64a3, 0x7fff1ca831f0)    = 0
rt_sigreturn(0x3139ad8)                 = -1 EINTR (Interrupted system call)
ioctl(8, 0x40086482, 0x7fff1ca83cb0)    = ? ERESTARTSYS (To be restarted)
--- SIGIO (I/O possible) @ 0 (0) ---
select(44, [11 12 13 14 42 43], NULL, NULL, {0, 0}) = 1 (in [42], left {0, 0})
read(42, "\262\337\177L\0\0\0\0\276w\16\0\0\0\0\0\2\0\0\0\1\0\0\0\262\337\177L\0\0\0\0"..., 384) = 48
ioctl(8, 0xc01c64a3, 0x7fff1ca831f0)    = 0
rt_sigreturn(0x3139ad8)                 = -1 EINTR (Interrupted system call)
ioctl(8, 0x40086482, 0x7fff1ca83cb0)    = ? ERESTARTSYS (To be restarted)
--- SIGIO (I/O possible) @ 0 (0) ---
select(44, [11 12 13 14 42 43], NULL, NULL, {0, 0}) = 1 (in [42], left {0, 0})
read(42, "\262\337\177L\0\0\0\0\223\177\16\0\0\0\0\0\2\0\1\0\1\0\0\0\262\337\177L\0\0\0\0"..., 384) = 48
ioctl(8, 0xc01c64a3, 0x7fff1ca831f0)    = 0
rt_sigreturn(0x3139ad8)                 = -1 EINTR (Interrupted system call)
ioctl(8, 0x40086482, 0x7fff1ca83cb0)    = ? ERESTARTSYS (To be restarted)
--- SIGIO (I/O possible) @ 0 (0) ---
select(44, [11 12 13 14 42 43], NULL, NULL, {0, 0}) = 1 (in [42], left {0, 0})
read(42, "\262\337\177L\0\0\0\0W\207\16\0\0\0\0\0\2\0\0\0\2\0\0\0\262\337\177L\0\0\0\0"..., 384) = 48
ioctl(8, 0xc01c64a3, 0x7fff1ca831f0)    = 0
rt_sigreturn(0x3139ad8)                 = -1 EINTR (Interrupted system call)
ioctl(8, 0x40086482, 0x7fff1ca83cb0)    = ? ERESTARTSYS (To be restarted)
--- SIGIO (I/O possible) @ 0 (0) ---
select(44, [11 12 13 14 42 43], NULL, NULL, {0, 0}) = 1 (in [42], left {0, 0})
read(42, "\262\337\177L\0\0\0\0001\217\16\0\0\0\0\0\2\0\0\0\1\0\0\0\262\337\177L\0\0\0\0"..., 384) = 72
ioctl(8, 0xc01c64a3, 0x7fff1ca831f0)    = 0
rt_sigreturn(0x3139ad8)                 = -1 EINTR (Interrupted system call)
ioctl(8, 0x40086482, 0x7fff1ca83cb0)    = ? ERESTARTSYS (To be restarted)
--- SIGIO (I/O possible) @ 0 (0) ---
select(44, [11 12 13 14 42 43], NULL, NULL, {0, 0}) = 1 (in [42], left {0, 0})
read(42, "\262\337\177L\0\0\0\0\3\227\16\0\0\0\0\0\2\0\0\0\1\0\0\0\262\337\177L\0\0\0\0"..., 384) = 48
ioctl(8, 0xc01c64a3, 0x7fff1ca831f0)    = 0
rt_sigreturn(0x3139ad8)                 = -1 EINTR (Interrupted system call)
ioctl(8, 0x40086482, 0x7fff1ca83cb0)    = ? ERESTARTSYS (To be restarted)
--- SIGIO (I/O possible) @ 0 (0) ---
select(44, [11 12 13 14 42 43], NULL, NULL, {0, 0}) = 1 (in [42], left {0, 0})
read(42, "\262\337\177L\0\0\0\0\307\236\16\0\0\0\0\0\2\0\0\0\2\0\0\0\262\337\177L\0\0\0\0"..., 384) = 72
ioctl(8, 0xc01c64a3, 0x7fff1ca831f0)    = 0
rt_sigreturn(0x3139ad8)                 = -1 EINTR (Interrupted system call)
ioctl(8, 0x40086482^C, 0x7fff1ca83cb0)    = ? ERESTARTSYS (To be restarted)
--- SIGALRM (Alarm clock) @ 0 (0) ---

Sending SIGTERM to X has no effect.  Sending SIGQUIT made the mouse freeze and them the screen go blank after a few seconds.  X restarted and the new process takes 100% CPU in the same loop as the old one had.

Something in the process of killing and restarting X logged this:


[drm] nouveau 0000:04:00.0: nouveau_channel_free: freeing fifo 2
[drm] nouveau 0000:04:00.0: Failed to idle channel 2.
[drm] nouveau 0000:04:00.0: PFIFO_DMA_PUSHER - Ch 127
[drm] nouveau 0000:04:00.0: nouveau_channel_free: freeing fifo 3
[drm] nouveau 0000:04:00.0: Allocating FIFO number 2
[drm] nouveau 0000:04:00.0: nouveau_channel_alloc: initialised FIFO 2
[drm] nouveau 0000:04:00.0: Allocating FIFO number 3
[drm] nouveau 0000:04:00.0: nouveau_channel_alloc: initialised FIFO 3

init 3 and killall -9 X gets X to go away, but I still have no console.

Rebooting with 'reboot' works fine.

This is on kernel 2.6.33.8-149.fc13.x86_64.  Nouveau startup says:


nouveau 0000:04:00.0: PCI INT A -> GSI 24 (level, low) -> IRQ 24
nouveau 0000:04:00.0: setting latency timer to 64
[drm] nouveau 0000:04:00.0: Detected an NV50 generation card (0x086f00a2)
[drm] nouveau 0000:04:00.0: Attempting to load BIOS image from PRAMIN
[drm] nouveau 0000:04:00.0: ... appears to be valid
[drm] nouveau 0000:04:00.0: BIT BIOS found
[drm] nouveau 0000:04:00.0: Bios version 60.86.5b.00
[drm] nouveau 0000:04:00.0: TMDS table revision 2.0 not currently supported
[drm] nouveau 0000:04:00.0: Found Display Configuration Block version 4.0
[drm] nouveau 0000:04:00.0: Raw DCB entry 0: 02011300 00000028
[drm] nouveau 0000:04:00.0: Raw DCB entry 1: 01011302 00000010
[drm] nouveau 0000:04:00.0: Raw DCB entry 2: 01000310 00000028
[drm] nouveau 0000:04:00.0: Raw DCB entry 3: 02000312 00000010
[drm] nouveau 0000:04:00.0: Raw DCB entry 4: 0000000e 00000000
[drm] nouveau 0000:04:00.0: DCB connector table: VHER 0x40 5 14 2
[drm] nouveau 0000:04:00.0:   0: 0x00002030: type 0x30 idx 0 tag 0x08
[drm] nouveau 0000:04:00.0:   1: 0x00001130: type 0x30 idx 1 tag 0x07
[drm] nouveau 0000:04:00.0: Parsing VBIOS init table 0 at offset 0xC34B
[drm] nouveau 0000:04:00.0: Parsing VBIOS init table 1 at offset 0xC6B5
[drm] nouveau 0000:04:00.0: Parsing VBIOS init table 2 at offset 0xD2F6
[drm] nouveau 0000:04:00.0: Parsing VBIOS init table 3 at offset 0xD3E8
[drm] nouveau 0000:04:00.0: Parsing VBIOS init table 4 at offset 0xD5E2
[drm] nouveau 0000:04:00.0: Parsing VBIOS init table at offset 0xD647
[drm] nouveau 0000:04:00.0: 0xD647: Condition still not met after 20ms, skipping following opcodes
[drm] nouveau 0000:04:00.0: 0xB50C: parsing output script 0
[drm] nouveau 0000:04:00.0: 0xB50C: parsing output script 0
[drm] nouveau 0000:04:00.0: Detected 256MiB VRAM
[TTM] Zone  kernel: Available graphics memory: 3059206 kiB.
[TTM] Zone   dma32: Available graphics memory: 2097152 kiB.
[ttm] Initializing pool allocator.
[drm] nouveau 0000:04:00.0: 512 MiB GART (aperture)
[drm] nouveau 0000:04:00.0: Allocating FIFO number 1
[drm] nouveau 0000:04:00.0: nouveau_channel_alloc: initialised FIFO 1
[drm] nouveau 0000:04:00.0: allocated 1920x1200 fb: 0x40250000, bo ffff8801b5694400
fbcon: nouveaufb (fb0) is primary device
[drm] nouveau 0000:04:00.0: 0xB510: parsing output script 1
[drm] nouveau 0000:04:00.0: 0x8679: parsing clock script 0