Processes stuck on rw_semaphore with no current holder.
Issue
- The kernel hung task watchdog reports processes as blocked:
INFO: task nbemm:3945 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
nbemm D 0000000000000001 0 3945 1 0x00000000
ffff8817eb5dfe08 0000000000000086 ffff8817eb5dfe48 ffff8817e5826cc0
ffff8817e335b800 ffffffff8120d6af ffff8817eb5dfd98 ffff880bde4c83c0
ffff8817ec255ab8 ffff8817eb5dffd8 000000000000f4e8 ffff8817ec255ab8
Call Trace:
[<ffffffff8120d6af>] ? security_inode_permission+0x1f/0x30
[<ffffffff811877da>] ? do_filp_open+0x6da/0xd60
[<ffffffff814ef4b5>] rwsem_down_failed_common+0x95/0x1d0
[<ffffffff814ef613>] rwsem_down_write_failed+0x23/0x30
[<ffffffff81277203>] call_rwsem_down_write_failed+0x13/0x20
[<ffffffff814eeb12>] ? down_write+0x32/0x40
[<ffffffff81131f7c>] sys_mmap_pgoff+0x5c/0x2d0
[<ffffffff81010469>] sys_mmap+0x29/0x30
[<ffffffff8100b0f2>] system_call_fastpath+0x16/0x1b
Kernel panic - not syncing: hung_task: blocked tasks
Environment
- Red Hat Enterprise Linux 6
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