Hi, I am trying to use on a embedded device that don't have network controller. when killing the slattach process, I manage to got a kernel panic [1]. Matthieu [1] # slattach: tty_set_speed: 0 [13677.910000] NETDEV WATCHDOG: sl0: transmit timed out [13677.910000] Unable to handle kernel NULL pointer dereference at virtual ad [13677.915000] pgd = c0004000 [13677.920000] [00000004] *pgd=00000000 [13677.920000] Internal error: Oops: 17 [#1] [13677.920000] CPU: 0 [13677.920000] PC is at sl_tx_timeout+0x54/0x100 [13677.920000] LR is at sl_tx_timeout+0x18/0x100 [13677.920000] pc : [<c010cc88>] lr : [<c010cc4c>] Not tainted [13677.920000] sp : c01abea0 ip : c01abea0 fp : c01abeb4 [13677.920000] r10: 3001a70c r9 : c01aa000 r8 : 00000000 [13677.920000] r7 : c01aa000 r6 : c0133664 r5 : c0440000 r4 : c0440260 [13677.920000] r3 : 00000000 r2 : 0028b43f r1 : 00000105 r0 : 00000000 [13677.920000] Flags: nzCv IRQs on FIQs on Mode SVC_32 Segment kernel [13677.920000] Control: 5317F [13677.920000] Table: 30900000 DAC: 00000017 [13677.920000] Process swapper (pid: 0, stack limit = 0xc01aa258) [13677.920000] Stack: (0xc01abea0 to 0xc01ac000) [13677.920000] bea0: c0440000 c01c6e68 c01abecc c01abeb8 c0133700 c010cc44 00 [13677.920000] bec0: c01abefc c01abed0 c003a800 c0133674 c01d5648 c01d5648 c0 [13677.920000] bee0: c01c6c64 0000000a 00000002 00000001 c01abf1c c01abf00 c0 [13677.920000] bf00: c01abf2c 0000001e c01ac780 00000000 c01abf2c c01abf20 c0 [13677.920000] bf20: c01abf4c c01abf30 c001ee38 c00364e8 c0828000 ffffffff f0 [13677.920000] bf40: c01abfa4 c01abf50 c001d9e4 c001edfc 00000000 0005317f 00 [13677.920000] bf60: c001f664 c01aa000 c01af144 c01d80fc 3001a740 41069265 30 [13677.920000] bf80: c01abf98 c01abf98 c002aca0 c001f6d0 a0000013 ffffffff c0 - To unsubscribe from this list: send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html