29 yielded holding sem.
kjournald     R current  4182741476    29      1           123    28 (L-TLB)
Call Trace:
 [<c01348e9>] shrink_cache+0x229/0x284
 [<c011985a>] release_console_sem+0x4e/0xa0
 [<c011977f>] printk+0x147/0x178
 [<c011977f>] printk+0x147/0x178
 [<c012bb9e>] __print_symbol+0x106/0x113
 [<c012bb9e>] __print_symbol+0x106/0x113
 [<c012bb9e>] __print_symbol+0x106/0x113
 [<c012728b>] kernel_text_address+0x2f/0x3b
 [<c01092ac>] show_trace+0x3c/0x8c
 [<c010931a>] show_trace_task+0x1e/0x24
 [<c0116f23>] show_task+0x1cb/0x1d4
 [<c0116b45>] sys_sched_yield+0x95/0xe4
 [<c0116bc7>] yield+0x17/0x1c
 [<c012fb08>] __alloc_pages+0x218/0x254
 [<c012c810>] find_or_create_page+0x3c/0xac
 [<c0145699>] grow_dev_page+0x21/0x128
 [<c0145831>] __getblk_slow+0x91/0xfc
 [<c0145be2>] __getblk+0x2e/0x38
 [<c0187bb9>] journal_get_descriptor_buffer+0x35/0x54
 [<c0184cb9>] journal_commit_transaction+0x675/0x1253
 [<c0115ea2>] schedule+0x28e/0x338
 [<c0187547>] kjournald+0xff/0x1e8
 [<c0187448>] kjournald+0x0/0x1e8
 [<c0187430>] commit_timeout+0x0/0x10
 [<c0107111>] kernel_thread_helper+0x5/0xc

29 yielded holding sem.
kjournald     R current  4182741476    29      1           123    28 (L-TLB)
Call Trace:
 [<c010931a>] show_trace_task+0x1e/0x24
 [<c0116f23>] show_task+0x1cb/0x1d4
 [<c0116b45>] sys_sched_yield+0x95/0xe4
 [<c0116bc7>] yield+0x17/0x1c
 [<c012fb08>] __alloc_pages+0x218/0x254
 [<c012c810>] find_or_create_page+0x3c/0xac
 [<c0145699>] grow_dev_page+0x21/0x128
 [<c0145831>] __getblk_slow+0x91/0xfc
 [<c0145be2>] __getblk+0x2e/0x38
 [<c0187bb9>] journal_get_descriptor_buffer+0x35/0x54
 [<c0184cb9>] journal_commit_transaction+0x675/0x1253
 [<c0115ea2>] schedule+0x28e/0x338
 [<c0187547>] kjournald+0xff/0x1e8
 [<c0187448>] kjournald+0x0/0x1e8
 [<c0187430>] commit_timeout+0x0/0x10
 [<c0107111>] kernel_thread_helper+0x5/0xc