Hi, I've been running into some odd crashes when starting my UML instance from Python. This is my script:
import subprocess subprocess.check_call(['path/to/vmlinux', 'mem=2048M', 'rootfstype=hostfs', 'rw', 'init=/bin/bash']) This will crash 9 out of 10 times with various strange messages on the console: [ 1.890000] devtmpfs: mounted [ 1.960000] mount (947) used greatest stack depth: 5592 bytes left [ 1.990000] mount (948) used greatest stack depth: 5496 bytes left #�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#�#��+J@��o��#7%����2Z����.�j o ��h� -^(�l0�w8�\@�}P�)o`o-�p)CS�-!���8��,��Ҋ8�>)DV9 � �9�����$��#�#�#�#[ 6.870000] [ 6.870000] Pid: 1, comm: init Not tainted 4.4.0-rc3 [ 6.870000] RIP: 0033:[<00000000018d4848>] [ 6.870000] RSP: 00000000dff3efa8 EFLAGS: 00010216 [ 6.870000] RAX: 0000000000000001 RBX: 00000000600748c0 RCX: 00007fb9d87dacd8 [ 6.870000] RDX: ffffffffffffffff RSI: 0000000000000001 RDI: 00000000dfeba3c8 [ 6.870000] RBP: 00000000dff3efe8 R08: 00000000dff3ee38 R09: 0000000000001382 [ 6.870000] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000dff3e000 [ 6.870000] R13: 0000000060050f90 R14: 0000000000000000 R15: 0000000060050a20 [ 6.870000] Kernel panic - not syncing: Kernel tried to access user memory at addr 0x18d4848, ip 0x18d4848 [ 6.870000] CPU: 0 PID: 1 Comm: init Not tainted 4.4.0-rc3 #1 [ 6.870000] [ 6.870000] Pid: -538516280, comm: Not tainted 4.4.0-rc3 [ 6.870000] RIP: 0033:[<000000006005b54a>] [ 6.870000] RSP: 00000000dff3c060 EFLAGS: 00010206 [ 6.870000] RAX: 0000000002556c00 RBX: 0000000002557610 RCX: 0000000000000001 [ 6.870000] RDX: 0000000000000006 RSI: 0000000000000000 RDI: 000000006005b54a [ 6.870000] RBP: 00000000dff3c120 R08: 00000000dff3e0a0 R09: 0000000000000001 [ 6.870000] R10: 0000000000000008 R11: 0000000000000246 R12: 00000000dff3c190 [ 6.870000] R13: 0000000000000000 R14: 000000006005b54a R15: 00000000dff3c578 [ 6.870000] Kernel panic - not syncing: Kernel tried to access user memory at addr 0x2557610, ip 0x6005b54a I think the biggest clue is perhaps this message that occurs occasionally: [ 1.880000] winch_thread : TIOCSCTTY failed on fd 1 err = 1 I've also seen these traces: [ 1.940000] Kernel panic - not syncing: Kernel mode signal 4 [ 1.940000] CPU: 0 PID: 1 Comm: swapper Not tainted 4.4.0-rc3 #1 [ 1.940000] Stack: [ 1.940000] e032f4e0 601099cb ffffffffff0a0110 6187c3c0 [ 1.940000] 611ad811 601ad6c6 e032f500 60acf171 [ 1.940000] 60acf134 60aeec40 e032f620 601ad207 [ 1.940000] Call Trace: [ 1.940000] [<60076f89>] ? os_is_signal_stack+0x29/0x40 [ 1.940000] [<601ad6c6>] ? printk+0x0/0xfd [ 1.940000] [<6005850e>] show_stack+0x1fe/0x430 [ 1.940000] [<601099cb>] ? dump_stack_print_info+0x17b/0x1f0 [ 1.940000] [<601ad6c6>] ? printk+0x0/0xfd [ 1.940000] [<60acf171>] dump_stack+0x3d/0x4c [ 1.940000] [<60acf134>] ? dump_stack+0x0/0x4c [ 1.940000] [<60aeec40>] ? bust_spinlocks+0x0/0xe0 [ 1.940000] [<601ad207>] panic+0x206/0x5be [ 1.940000] [<601ad001>] ? panic+0x0/0x5be [ 1.940000] [<6005bfde>] relay_signal+0x23e/0x290 [ 1.940000] [<60076c08>] sig_handler_common+0x98/0x1a0 [ 1.940000] [<60076db4>] sig_handler+0xa4/0x160 [ 1.940000] [<600761e1>] hard_handler+0xf1/0x1e0 [ 1.940000] [<601182ab>] ? __call_rcu.isra.1+0x9b/0x140 [ 1.940000] [<60ae48bf>] ? put_dec+0x4f/0x140 [ 1.940000] [<60ae7ce0>] ? number.isra.10+0x720/0x7e0 [ 1.940000] [<601182ab>] ? __call_rcu.isra.1+0x9b/0x140 [ 1.940000] [<600eecec>] ? __enqueue_entity+0xec/0x130 [ 1.940000] [<600f06a0>] ? update_cfs_shares.isra.11+0x0/0x1e0 [ 1.940000] [<600ef3f8>] ? check_preempt_wakeup+0x468/0x6a0 [ 1.940000] [<600748c0>] ? write_sigio_thread+0x0/0x500 [ 1.940000] [<6007494e>] ? write_sigio_thread+0x8e/0x500 [ 1.940000] [<600e625d>] ? schedule_tail+0x2d/0x290 [ 1.940000] [<600748c0>] ? write_sigio_thread+0x0/0x500 and [ 1.900000] Pid: 943, comm: deferwq Not tainted 4.4.0-rc3 [ 1.900000] RIP: 0033:[<0000000000000000>] (On Ctrl-C:) [ 239.840000] Kernel panic - not syncing: Kernel tried to access user memory at addr 0x1844248, ip 0x1844248 [ 239.840000] CPU: 0 PID: 1 Comm: init Not tainted 4.4.0-rc3 #1 [ 239.840000] [ 239.840000] Pid: -538516280, comm: Not tainted 4.4.0-rc3 [ 239.840000] RIP: 0033:[<000000006005b54a>] When I start my instance from the command line (but inside a screen -- the Python script was also started in a screen) there is no problem AFAICT. I am not passing any con*= parameters, so it should be using all the defaults. I can test patches. Thanks, Vegard ------------------------------------------------------------------------------ Go from Idea to Many App Stores Faster with Intel(R) XDK Give your users amazing mobile app experiences with Intel(R) XDK. Use one codebase in this all-in-one HTML5 development environment. Design, debug & build mobile apps & 2D/3D high-impact games for multiple OSs. http://pubads.g.doubleclick.net/gampad/clk?id=254741911&iu=/4140 _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
