Why RHEL 6 machine crashes while trying to read from a tty in n_tty_read ?
Issue
- kernel BUG at drivers/char/n_tty.c:1713!
- Kernel panic due to NULL pointer dereference at n_tty_read
- Showing following traces
#7 [ffff8806954d7ca0] do_page_fault at ffffffff814e0c3e
#8 [ffff8806954d7cd0] page_fault at ffffffff814ddfe5
[exception RIP: n_tty_read+713]
RIP: ffffffff81305f19 RSP: ffff8806954d7d88 RFLAGS: 00010246
RAX: 000000000000000d RBX: ffff8806954d6000 RCX: 00007fafbda02034
RDX: 0000000000000000 RSI: 00000000fffffff3 RDI: ffff88011229951c
RBP: ffff8806954d7e98 R8: 0000000000000001 R9: 0000000000000001
R10: 00000000ffffffff R11: 0000000000000000 R12: ffff880112299000
R13: 0000000000000000 R14: ffff880112299268 R15: ffff88011229951c
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
#9 [ffff8806954d7ea0] tty_read at ffffffff81300b16
#10 [ffff8806954d7ef0] vfs_read at ffffffff81172f85
#11 [ffff8806954d7f30] sys_read at ffffffff811730c1
Environment
- Red Hat Enterprise Linux 6
- kernel-2.6.32-131.0.15.el6
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