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SubjectRe: 2.6.9-rc2-mm3
On Fri, 24 Sep 2004, James Morris wrote:

> I'm getting what looks like a deadlock during boot with this kernel,
> .config, bootlog and sysrq output attached. Looks like it may be related
> to the serial/tty code?

Backing these out lets me boot again:

+tty-driver-take-4-try-2.patch
+tty-locking-build-fix.patch

Also, here's what the NMI oopser says:

NMI Watchdog detected LOCKUP on CPU1, eip c03516ab, registers:
Modules linked in:
CPU: 1
EIP: 0060:[<c03516ab>] Not tainted VLI
EFLAGS: 00000006 (2.6.9-rc2-mm3)
EIP is at _spin_lock_irqsave+0x1e/0x53
eax: 00000000 ebx: 00000000 ecx: c1950ee0 edx: 00000006
esi: c03eaec8 edi: c1950000 ebp: c1950e30 esp: c1950e24
ds: 007b es: 007b ss: 0068
Process init (pid: 1, threadinfo=c1950000 task=c194f9d0)
Stack: f7bb537c f7bb537c 00000000 c1950e40 c026b3a4 f7bb537c c1950ee0
c1950e58
c027f485 00009600 c049fd40 f7bb537c 00000013 c1950e94 c0283af1 00000000
0001c200 00000000 00000202 c1950ec0 c014af00 00000000 0001c200 00000000
Call Trace:
[<c0106ba1>] show_stack+0x7a/0x90
[<c0106d22>] show_registers+0x152/0x1ca
[<c010797c>] die_nmi+0x50/0x83
[<c0112cdf>] nmi_watchdog_tick+0x9a/0xb6
[<c0107a0a>] default_do_nmi+0x5b/0xe7
[<c0107add>] do_nmi+0x40/0x4a
[<c01068d5>] nmi_stack_correct+0x1e/0x2e
[<c026b3a4>] tty_termios_baud_rate+0x11/0x67
[<c027f485>] uart_get_baud_rate+0x53/0xd4
[<c0283af1>] serial8250_set_termios+0x8d/0x348
[<c027f580>] uart_change_speed+0x4a/0x64
[<c0280664>] uart_set_termios+0x4f/0x162
[<c026e94f>] change_termios+0x1b3/0x21a
[<c026ea40>] set_termios+0x8a/0xf9
[<c026ad15>] tty_ioctl+0x152/0x44f
[<c0169687>] sys_ioctl+0x231/0x282
[<c0105d09>] sysenter_past_esp+0x52/0x71
Code: 83 47 14 01 eb d2 e8 53 f3 ff ff eb e3 55 89 e5 57 56 89 c6 b8 00 f0
ff ff 53 21 e0 83 40 14 01 31 db 89 c7 9c 5a
fa 89 d8 86 06 <84> c0 7e 07 5b 89 d0 5e 5f 5d c3 52 9d 8b 47 08 83 6f 14
01 a8
console shuts up ...


Looks like tty_termios_lock.


--
James Morris
<jmorris@redhat.com>



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