n_tty_read の tty から読み込むと RHEL 6.4 マシンがクラッシュする
Issue
RHEL 6.2 から RHEL 6.4 にアップグレードするとシステムがクラッシュし、以下のバックトレースが記録されます。
[848346.503219] kernel BUG at drivers/char/n_tty.c:1713!
[848346.508963] invalid opcode:0000 [#1] SMP
[848346.513765] last sysfs file:/sys/devices/pci0000:c0/0000:c0:05.2/class
[848346.521346] CPU 4
...
[848346.559481]
[848346.561342] Pid:21051, comm: ssh Not tainted 2.6.32-358.11.1.el6.x86_64 #1 IBM System x3750 M4 -[8722AC1]-/00D1471
[848346.573346] RIP:0010:[<ffffffff81329a27>] [<ffffffff81329a27>] n_tty_read+0x987/0x990
[848346.582605] RSP:0018:ffff8801797dbd88 EFLAGS:00010246
[848346.588738] RAX: ffff880ecb9a9500 RBX: ffff881036ab2680 RCX: ffff88103a57e0d8
[848346.597004] RDX: ffff88103a57e1c0 RSI: ffff881036ab2680 RDI: ffff88103a57e000
[848346.605270] RBP: ffff8801797dbe98 R08: ffffffff81323f30 R09:0101010101010101
[848346.613536] R10:0000000000000000 R11:0000000000000246 R12: ffff88103a57e000
[848346.621803] R13: ffff881069999298 R14: ffff88103a57e268 R15: ffff88103a57e51c
[848346.630072] FS:00007f0e467217c0(0000) GS:ffff880028300000(0000) knlGS:0000000000000000
[848346.639406] CS:0010 DS:0000 ES:0000 CR0:0000000080050033
[848346.646025] CR2:00007fb8c85ca000 CR3:00000002acedf000 CR4:00000000000407a0
[848346.654290] DR0:0000000000000000 DR1:0000000000000000 DR2:0000000000000000
[848346.662557] DR3:0000000000000000 DR6:00000000ffff0ff0 DR7:0000000000000400
[848346.670826] Process ssh (pid:21051, threadinfo ffff8801797da000, task ffff880ecb9a9500)
[848346.682081] Stack:
[848346.684521] ffffffff8100bb8e ffff8801797dbe18 ffff88103a57e1c8 ffff880ecb9a9500
[848346.692833] <d> ffff88103a57e1c0 ffff88103a57e490 0000000000000246 ffff880ecb9a9500
[848346.701754] <d> ffff88103a57e0d8 0000000000000000 ffff880ecb9a9500 ffffffffffffff10
[848346.710975] Call Trace:
[848346.713903] [<ffffffff8100bb8e>] ? apic_timer_interrupt+0xe/0x20
[848346.720910] [<ffffffff81510547>] ?_spin_unlock_irqrestore+0x17/0x20
[848346.728310] [<ffffffff81063310>] ? default_wake_function+0x0/0x20
[848346.735453] [<ffffffff81323fd6>] tty_read+0xa6/0xf0
[848346.741199] [<ffffffff81181805>] vfs_read+0xb5/0x1a0
[848346.747042] [<ffffffff81181941>] sys_read+0x51/0x90
[848346.752787] [<ffffffff810dc595>] ?__audit_syscall_exit+0x265/0x290
[848346.760091] [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b
Environment
- RHEL 6.4.z kernel-2.6.32-358.11.1.el6 以前
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