[uml-devel] spinlock recursion w/ 3.16.0-10473-gc8d6637

[uml-devel] spinlock recursion w/ 3.16.0-10473-gc8d6637

[Toralf Förster]

/me wonders who could/should be informed about this BUG message from a 32 bit UML guest (the "dirty" comes from reverted commit 8c86e70a)


BUG: spinlock recursion on CPU#0, rngd/1231
 lock: 0x86f1588, .magic: dead4ead, .owner: rngd/1231, .owner_cpu: 0
CPU: 0 PID: 1231 Comm: rngd Not tainted 3.16.0-10473-gc8d6637-dirty #3
Stack:
 085bfb48 085bfb48 00000003 086f0547 85f6e1c0 086f1588 00000008 85f9f990
 08500fcf 00000000 85f9f964 85f9f9bc 084fd789 085cc734 086f1588 dead4ead
 85f6e408 000004cf 00000000 8437ab40 086f1588 085ca958 85f9f9cc 084fd7ab
Call Trace:
 [<084fd7ab>] ? spin_bug+0x1b/0x1f
 [<08500fcf>] dump_stack+0x26/0x28
 [<084fd789>] spin_dump+0xa1/0xa8
 [<084fd7ab>] spin_bug+0x1b/0x1f
 [<080a0db3>] do_raw_spin_lock+0x43/0x100
 [<0809739c>] ? finish_task_switch.constprop.53+0x3c/0x90
 [<08505421>] _raw_spin_lock+0x11/0x20
 [<08060622>] sigio_lock+0x12/0x20
 [<08071261>] add_sigio_fd+0x11/0x100
 [<0805ec9a>] reactivate_fd+0x6a/0x80
 [<08060597>] sigio_interrupt+0x37/0x40
 [<080a59bf>] handle_irq_event_percpu+0x2f/0x130
 [<080a9c94>] ? rcu_bh_qs+0x44/0x50
 [<080a5af4>] handle_irq_event+0x34/0x50
 [<080a8100>] handle_edge_irq+0xf0/0x120
 [<080a53cb>] generic_handle_irq+0x2b/0x30
 [<0805eda5>] do_IRQ+0x25/0x40
 [<0805ee25>] sigio_handler+0x65/0x90
 [<08071ade>] sig_handler_common+0xae/0xd0
 [<08071c2e>] ? set_signals+0x1e/0x40
 [<080d6d87>] ? get_page_from_freelist+0x327/0x5b0
 [<080d77d7>] ? __alloc_pages_nodemask+0xe7/0x7e0
 [<08062a23>] ? copy_chunk_from_user+0x23/0x30
 [<085054c1>] ? _raw_spin_unlock+0x11/0x20
 [<08106514>] ? deactivate_slab+0x424/0x470
 [<084fec79>] ? alloc_debug_processing+0xce/0x152
 [<0805f388>] ? uml_kmalloc+0x18/0x20
 [<08062a23>] ? copy_chunk_from_user+0x23/0x30
 [<08071c2e>] ? set_signals+0x1e/0x40
 [<084fef8f>] ? __slab_alloc.constprop.65+0x292/0x2be
 [<085054ec>] ? _raw_spin_unlock_irqrestore+0x1c/0x20
 [<0805f388>] ? uml_kmalloc+0x18/0x20
 [<080980f4>] ? default_wake_function+0x14/0x20
 [<0811f67e>] ? pollwake+0x6e/0x70
 [<08062a53>] ? copy_chunk_to_user+0x23/0x30
 [<0810690b>] ? __kmalloc+0x7b/0x140
 [<08071a0b>] unblock_signals+0x4b/0x70
 [<08071c2e>] set_signals+0x1e/0x40
 [<08070ef4>] update_thread+0x134/0x140
 [<0807132d>] add_sigio_fd+0xdd/0x100
 [<0805ec9a>] reactivate_fd+0x6a/0x80
 [<0806e3e9>] rng_dev_read+0x149/0x260
 [<080980e0>] ? default_wake_function+0x0/0x20
 [<0810d713>] vfs_read+0x93/0x190
 [<0810dd01>] SyS_read+0x51/0xa0
 [<080629e0>] handle_syscall+0x60/0x80
 [<0804d120>] ? pidmap_init+0x8b/0xaf
 [<084bf67c>] ? ptrace+0x2c/0x70
 [<080794a2>] ? get_fp_registers+0x22/0x40
 [<080745ac>] userspace+0x46c/0x5e0
 [<080799f6>] ? os_set_thread_area+0x26/0x40
 [<08078a0c>] ? do_set_thread_area+0x1c/0x50
 [<08078b88>] ? arch_switch_tls+0xb8/0x100
 [<0805f720>] fork_handler+0x60/0x70


-- 
Toralf


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