Hi Richard, On Wed, May 9, 2012 at 12:06 PM, richard -rw- weinberger <richard.weinber...@gmail.com> wrote: >> we're having issues with a UML machine that refuses to shut down: the >> halt sequence commences and then we get the following kernel error >> message and backtrace: >> >> Asking all remaining processes to terminate... >> INFO: task killall5:5269 blocked for more than 120 seconds. >> [ 1080.320000] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" >> disables this message. >> [ 1080.320000] killall5 D 00000000405070c3 0 5269 >> 5266 0x00000000 >> [ 1080.320000] 93d84c08 9354d288 9354ce38 6063e550 9200bc28 >> 6001a7f3 93d84780 92008000 >> [ 1080.320000] 92008000 93d84780 9200bc88 604345ad 9200bc48 >> 9354ce00 9200bc88 92008000 >> [ 1080.320000] 00000001 93d84780 93588060 00000001 >> ffffffffffffffff 00000000 9200bce8 604357cd >> [ 1080.320000] Call Trace: >> [ 1080.320000] 9200bc00: [<6001a7f3>] _switch_to+0x5e/0xae >> [ 1080.320000] 9200bc30: [<604345ad>] schedule+0x240/0x27a >> [ 1080.320000] 9200bc90: [<604357cd>] rwsem_down_failed_common+0xb8/0xd8 >> [ 1080.320000] 9200bcf0: [<60435814>] rwsem_down_read_failed+0x12/0x14 >> [ 1080.320000] 9200bd00: [<6002ecec>] >> call_rwsem_down_read_failed+0x14/0x24 >> [ 1080.320000] 9200bd48: [<60434fc2>] down_read+0x11/0x13 >> [ 1080.320000] 9200bd58: [<6007a6ec>] access_process_vm+0x45/0x147 >> [ 1080.320000] 9200bdc8: [<600cdd13>] proc_pid_cmdline+0x65/0xf9 >> [ 1080.320000] 9200be18: [<600cf298>] proc_info_read+0x68/0xcb >> [ 1080.320000] 9200be68: [<6008f2c7>] vfs_read+0xa7/0x155 >> [ 1080.320000] 9200bea8: [<6008f42e>] sys_read+0x45/0x6c >> [ 1080.320000] 9200bee8: [<6001cd9c>] handle_syscall+0x58/0x70 >> [ 1080.320000] 9200bf08: [<6002c00f>] userspace+0x2d4/0x381 >> [ 1080.320000] 9200bfc8: [<6001a6f3>] fork_handler+0x62/0x69 >> [ 1080.320000] >> >> The error repeats every 120 seconds, and the machine never shuts down. > > Can you please try a recent kernel? > Maybe you need this commit: > 3a3679078aed2c451ebc32836bbd3b8219a65e01 (um: Use RWSEM_GENERIC_SPINLOCK on > x86) >
We're trying 3.2.16 right now (also from devloop.org.uk); it might take some time before we are able to confirm or disprove, since the bug does not occur deterministically but only on a certain percentage of the runs. Thanks, Riccardo ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ User-mode-linux-user mailing list User-mode-linux-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
