Hi, I am testing/evaluating PREEMPT_RT patch on a Freescale's board with following details, target system : mpc8572ds (powerpc) kernel version : 2.6.31 now 2.6.31-rt21 after patching the kernel when I enable Full Preemption mode I receive following messages in the log (dmesg). Although I am not facing any hang/crash issue yet due to/in effect of these messages but I am looking to fix these. On investigating I found that this issue occurs when an rt_spin_lock is acquired while the interrupt/preemption is disabled. Also analyzing the patch in detail I found that many spin_lock are replaced with atomic_spin_lock. Should I replace the remaining ones..? or please guide me how to fix this issue... at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2369, name: smbd Call Trace: [eeb21e60] [c0008840] show_stack+0x70/0x1b4 (unreliable) [eeb21e90] [c0040af8] __might_sleep+0xf0/0xf4 [eeb21ea0] [c045ed0c] rt_spin_lock+0xa4/0xa8 [eeb21eb0] [c00dde70] mprotect_fixup+0x1b4/0x3e4 [eeb21f10] [c00de208] sys_mprotect+0x168/0x1e4 [eeb21f40] [c0012ad0] ret_from_syscall+0x0/0x3c BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2370, name: smbd Call Trace: [ef2b1df0] [c0008840] show_stack+0x70/0x1b4 (unreliable) [ef2b1e20] [c0040af8] __might_sleep+0xf0/0xf4 [ef2b1e30] [c045ed0c] rt_spin_lock+0xa4/0xa8 [ef2b1e40] [c00d4ef0] __do_fault+0x154/0x508 [ef2b1e90] [c0017174] do_page_fault+0x214/0x4b0 [ef2b1f40] [c0012f10] handle_page_fault+0xc/0x80 BUG: scheduling while atomic: rc/0x00000001/2373, CPU#0 Modules linked in: t23xrm Call Trace: [ee9079b0] [c0008840] show_stack+0x70/0x1b4 (unreliable) [ee9079e0] [c00470a8] __schedule_bug+0xac/0xb0 [ee907a00] [c045c638] __schedule+0x448/0x89c [ee907a70] [c045cd6c] schedule+0x20/0x44 [ee907a80] [c045e1f4] rt_spin_lock_slowlock+0x2cc/0x334 [ee907b00] [c00bef28] get_zone_pcp+0x70/0xd4 [ee907b30] [c00c0a40] free_hot_cold_page+0x134/0x3d4 [ee907b70] [c00c5ca0] put_page+0x60/0x198 [ee907b90] [c00e40e0] free_page_and_swap_cache+0x38/0x7c [ee907ba0] [c00d642c] unmap_vmas+0x48c/0x690 [ee907c30] [c00db86c] exit_mmap+0x108/0x21c [ee907c90] [c004d674] mmput+0x74/0x12c [ee907cb0] [c00f8b2c] flush_old_exec+0x3a0/0x658 [ee907cf0] [c013cd6c] load_elf_binary+0x468/0x1394 [ee907d70] [c00f80c8] search_binary_handler+0x214/0x43c [ee907dd0] [c013aed0] load_script+0x270/0x284 [ee907e80] [c00f80c8] search_binary_handler+0x214/0x43c [ee907ee0] [c00f98bc] do_execve+0x30c/0x35c [ee907f20] [c00097bc] sys_execve+0x68/0xa4 [ee907f40] [c0012ad0] ret_from_syscall+0x0/0x3c LDA version 0.9.6 (aarshad@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx) NR_CPUS=2 Wed Oct 6 08:22:39 UTC 2010 BUG: using smp_processor_id() in preemptible [00000000] code: modprobe/2380 caller is init_lda+0x60/0x2b0 [lda] Call Trace: [ee919e80] [c0008840] show_stack+0x70/0x1b4 (unreliable) [ee919eb0] [c025458c] debug_smp_processor_id+0xf8/0xfc [ee919ed0] [f917b060] init_lda+0x60/0x2b0 [lda] [ee919ef0] [c0001d78] do_one_initcall+0x54/0x218 [ee919f20] [c008fb70] sys_init_module+0x120/0x230 [ee919f40] [c0012ad0] ret_from_syscall+0x0/0x3c BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2334, name: named Call Trace: [eeb19df0] [c0008840] show_stack+0x70/0x1b4 (unreliable) [eeb19e20] [c0040af8] __might_sleep+0xf0/0xf4 [eeb19e30] [c045ed0c] rt_spin_lock+0xa4/0xa8 [eeb19e40] [c00d4ef0] __do_fault+0x154/0x508 [eeb19e90] [c0017174] do_page_fault+0x214/0x4b0 [eeb19f40] [c0012f10] handle_page_fault+0xc/0x80 BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2365, name: ntpd Call Trace: [ee99bdf0] [c0008840] show_stack+0x70/0x1b4 (unreliable) [ee99be20] [c0040af8] __might_sleep+0xf0/0xf4 [ee99be30] [c045ed0c] rt_spin_lock+0xa4/0xa8 [ee99be40] [c00d4ef0] __do_fault+0x154/0x508 [ee99be90] [c0017174] do_page_fault+0x214/0x4b0 [ee99bf40] [c0012f10] handle_page_fault+0xc/0x80 BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2365, name: ntpd Call Trace: [ee99bdf0] [c0008840] show_stack+0x70/0x1b4 (unreliable) [ee99be20] [c0040af8] __might_sleep+0xf0/0xf4 [ee99be30] [c045ed0c] rt_spin_lock+0xa4/0xa8 [ee99be40] [c00d4ef0] __do_fault+0x154/0x508 [ee99be90] [c0017174] do_page_fault+0x214/0x4b0 [ee99bf40] [c0012f10] handle_page_fault+0xc/0x80 BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2386, name: freshclam Call Trace: [ee907df0] [c0008840] show_stack+0x70/0x1b4 (unreliable) [ee907e20] [c0040af8] __might_sleep+0xf0/0xf4 [ee907e30] [c045ed0c] rt_spin_lock+0xa4/0xa8 [ee907e40] [c00d4ef0] __do_fault+0x154/0x508 [ee907e90] [c0017174] do_page_fault+0x214/0x4b0 [ee907f40] [c0012f10] handle_page_fault+0xc/0x80 BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2386, name: freshclam Call Trace: [ee907b20] [c0008840] show_stack+0x70/0x1b4 (unreliable) [ee907b50] [c0040af8] __might_sleep+0xf0/0xf4 [ee907b60] [c045ed0c] rt_spin_lock+0xa4/0xa8 [ee907b70] [c00d7634] handle_mm_fault+0x564/0x81c [ee907bd0] [c0017174] do_page_fault+0x214/0x4b0 [ee907c80] [c0012f10] handle_page_fault+0xc/0x80 [ee907d40] [c00b9128] file_read_actor+0x27c/0x2d0 [ee907d70] [c00bbf38] generic_file_aio_read+0x364/0x79c [ee907e00] [c0198804] nfs_file_read+0x1a0/0x21c [ee907e30] [c00f12fc] do_sync_read+0xd0/0x15c [ee907ef0] [c00f238c] vfs_read+0xcc/0x19c [ee907f10] [c00f2594] sys_read+0x58/0xc8 [ee907f40] [c0012ad0] ret_from_syscall+0x0/0x3c BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2386, name: freshclam Call Trace: [ee907b20] [c0008840] show_stack+0x70/0x1b4 (unreliable) [ee907b50] [c0040af8] __might_sleep+0xf0/0xf4 [ee907b60] [c045ed0c] rt_spin_lock+0xa4/0xa8 [ee907b70] [c00d7634] handle_mm_fault+0x564/0x81c [ee907bd0] [c0017174] do_page_fault+0x214/0x4b0 [ee907c80] [c0012f10] handle_page_fault+0xc/0x80 [ee907d40] [c00b9128] file_read_actor+0x27c/0x2d0 [ee907d70] [c00bbf38] generic_file_aio_read+0x364/0x79c [ee907e00] [c0198804] nfs_file_read+0x1a0/0x21c [ee907e30] [c00f12fc] do_sync_read+0xd0/0x15c [ee907ef0] [c00f238c] vfs_read+0xcc/0x19c [ee907f10] [c00f2594] sys_read+0x58/0xc8 [ee907f40] [c0012ad0] ret_from_syscall+0x0/0x3c BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2386, name: freshclam Call Trace: [ee907de0] [c0008840] show_stack+0x70/0x1b4 (unreliable) [ee907e10] [c0040af8] __might_sleep+0xf0/0xf4 [ee907e20] [c045ed0c] rt_spin_lock+0xa4/0xa8 [ee907e30] [c00d7634] handle_mm_fault+0x564/0x81c [ee907e90] [c0017174] do_page_fault+0x214/0x4b0 [ee907f40] [c0012f10] handle_page_fault+0xc/0x80 BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2386, name: freshclam Call Trace: [ee907b20] [c0008840] show_stack+0x70/0x1b4 (unreliable) [ee907b50] [c0040af8] __might_sleep+0xf0/0xf4 [ee907b60] [c045ed0c] rt_spin_lock+0xa4/0xa8 [ee907b70] [c00d7634] handle_mm_fault+0x564/0x81c [ee907bd0] [c0017174] do_page_fault+0x214/0x4b0 [ee907c80] [c0012f10] handle_page_fault+0xc/0x80 [ee907d40] [c00b9128] file_read_actor+0x27c/0x2d0 [ee907d70] [c00bbf38] generic_file_aio_read+0x364/0x79c [ee907e00] [c0198804] nfs_file_read+0x1a0/0x21c [ee907e30] [c00f12fc] do_sync_read+0xd0/0x15c [ee907ef0] [c00f238c] vfs_read+0xcc/0x19c [ee907f10] [c00f2594] sys_read+0x58/0xc8 [ee907f40] [c0012ad0] ret_from_syscall+0x0/0x3c BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2386, name: freshclam Call Trace: [ee907b20] [c0008840] show_stack+0x70/0x1b4 (unreliable) [ee907b50] [c0040af8] __might_sleep+0xf0/0xf4 [ee907b60] [c045ed0c] rt_spin_lock+0xa4/0xa8 [ee907b70] [c00d7634] handle_mm_fault+0x564/0x81c [ee907bd0] [c0017174] do_page_fault+0x214/0x4b0 [ee907c80] [c0012f10] handle_page_fault+0xc/0x80 [ee907d40] [c00b9128] file_read_actor+0x27c/0x2d0 [ee907d70] [c00bbf38] generic_file_aio_read+0x364/0x79c [ee907e00] [c0198804] nfs_file_read+0x1a0/0x21c [ee907e30] [c00f12fc] do_sync_read+0xd0/0x15c [ee907ef0] [c00f238c] vfs_read+0xcc/0x19c [ee907f10] [c00f2594] sys_read+0x58/0xc8 [ee907f40] [c0012ad0] ret_from_syscall+0x0/0x3c BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2372, name: nmbd Call Trace: [eeb21df0] [c0008840] show_stack+0x70/0x1b4 (unreliable) [eeb21e20] [c0040af8] __might_sleep+0xf0/0xf4 [eeb21e30] [c045ed0c] rt_spin_lock+0xa4/0xa8 [eeb21e40] [c00d4ef0] __do_fault+0x154/0x508 [eeb21e90] [c0017174] do_page_fault+0x214/0x4b0 [eeb21f40] [c0012f10] handle_page_fault+0xc/0x80 BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2365, name: ntpd Call Trace: [ee99bdf0] [c0008840] show_stack+0x70/0x1b4 (unreliable) [ee99be20] [c0040af8] __might_sleep+0xf0/0xf4 [ee99be30] [c045ed0c] rt_spin_lock+0xa4/0xa8 [ee99be40] [c00d4ef0] __do_fault+0x154/0x508 [ee99be90] [c0017174] do_page_fault+0x214/0x4b0 [ee99bf40] [c0012f10] handle_page_fault+0xc/0x80 BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2372, name: nmbd Call Trace: [eeb21df0] [c0008840] show_stack+0x70/0x1b4 (unreliable) [eeb21e20] [c0040af8] __might_sleep+0xf0/0xf4 [eeb21e30] [c045ed0c] rt_spin_lock+0xa4/0xa8 [eeb21e40] [c00d4ef0] __do_fault+0x154/0x508 [eeb21e90] [c0017174] do_page_fault+0x214/0x4b0 [eeb21f40] [c0012f10] handle_page_fault+0xc/0x80 BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2391, name: getty Call Trace: [eea31de0] [c0008840] show_stack+0x70/0x1b4 (unreliable) [eea31e10] [c0040af8] __might_sleep+0xf0/0xf4 [eea31e20] [c045ed0c] rt_spin_lock+0xa4/0xa8 [eea31e30] [c00d7634] handle_mm_fault+0x564/0x81c [eea31e90] [c0017174] do_page_fault+0x214/0x4b0 [eea31f40] [c0012f10] handle_page_fault+0xc/0x80 BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2391, name: sh Call Trace: [eea31d50] [c0008840] show_stack+0x70/0x1b4 (unreliable) [eea31d80] [c0040af8] __might_sleep+0xf0/0xf4 [eea31d90] [c045ed0c] rt_spin_lock+0xa4/0xa8 [eea31da0] [c00d8bc4] copy_page_range+0x160/0x4dc [eea31e20] [c004dcec] dup_mm+0x2b4/0x3e4 [eea31e60] [c004ea1c] copy_process+0xbb4/0xfac [eea31ec0] [c004eeac] do_fork+0x98/0x3d4 [eea31f20] [c0008cb8] sys_clone+0x68/0xac [eea31f40] [c0012ad0] ret_from_syscall+0x0/0x3c BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2391, name: sh Call Trace: [eea31b20] [c0008840] show_stack+0x70/0x1b4 (unreliable) [eea31b50] [c0040af8] __might_sleep+0xf0/0xf4 [eea31b60] [c045ed0c] rt_spin_lock+0xa4/0xa8 [eea31b70] [c00d7634] handle_mm_fault+0x564/0x81c [eea31bd0] [c0017174] do_page_fault+0x214/0x4b0 [eea31c80] [c0012f10] handle_page_fault+0xc/0x80 [eea31d40] [c00b9128] file_read_actor+0x27c/0x2d0 [eea31d70] [c00bbf38] generic_file_aio_read+0x364/0x79c [eea31e00] [c0198804] nfs_file_read+0x1a0/0x21c [eea31e30] [c00f12fc] do_sync_read+0xd0/0x15c [eea31ef0] [c00f238c] vfs_read+0xcc/0x19c [eea31f10] [c00f2594] sys_read+0x58/0xc8 [eea31f40] [c0012ad0] ret_from_syscall+0x0/0x3c BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2365, name: ntpd Call Trace: [ee99bdf0] [c0008840] show_stack+0x70/0x1b4 (unreliable) [ee99be20] [c0040af8] __might_sleep+0xf0/0xf4 [ee99be30] [c045ed0c] rt_spin_lock+0xa4/0xa8 [ee99be40] [c00d4ef0] __do_fault+0x154/0x508 [ee99be90] [c0017174] do_page_fault+0x214/0x4b0 [ee99bf40] [c0012f10] handle_page_fault+0xc/0x80 BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2334, name: named Call Trace: [eeb19df0] [c0008840] show_stack+0x70/0x1b4 (unreliable) [eeb19e20] [c0040af8] __might_sleep+0xf0/0xf4 [eeb19e30] [c045ed0c] rt_spin_lock+0xa4/0xa8 [eeb19e40] [c00d4ef0] __do_fault+0x154/0x508 [eeb19e90] [c0017174] do_page_fault+0x214/0x4b0 [eeb19f40] [c0012f10] handle_page_fault+0xc/0x80 BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2386, name: freshclam Call Trace: [ee907da0] [c0008840] show_stack+0x70/0x1b4 (unreliable) [ee907dd0] [c0040af8] __might_sleep+0xf0/0xf4 [ee907de0] [c045ed0c] rt_spin_lock+0xa4/0xa8 [ee907df0] [c00d6190] unmap_vmas+0x1f0/0x690 [ee907e80] [c00db574] unmap_region+0xf0/0x214 [ee907ef0] [c00dca78] do_munmap+0x2b8/0x33c [ee907f20] [c00dcb44] sys_munmap+0x48/0x78 [ee907f40] [c0012ad0] ret_from_syscall+0x0/0x3c BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2386, name: freshclam Call Trace: [ee907da0] [c0008840] show_stack+0x70/0x1b4 (unreliable) [ee907dd0] [c0040af8] __might_sleep+0xf0/0xf4 [ee907de0] [c045ed0c] rt_spin_lock+0xa4/0xa8 [ee907df0] [c00d6190] unmap_vmas+0x1f0/0x690 [ee907e80] [c00db574] unmap_region+0xf0/0x214 [ee907ef0] [c00dca78] do_munmap+0x2b8/0x33c [ee907f20] [c00dcb44] sys_munmap+0x48/0x78 [ee907f40] [c0012ad0] ret_from_syscall+0x0/0x3c BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2372, name: nmbd Call Trace: [eeb21df0] [c0008840] show_stack+0x70/0x1b4 (unreliable) [eeb21e20] [c0040af8] __might_sleep+0xf0/0xf4 [eeb21e30] [c045ed0c] rt_spin_lock+0xa4/0xa8 [eeb21e40] [c00d4ef0] __do_fault+0x154/0x508 [eeb21e90] [c0017174] do_page_fault+0x214/0x4b0 [eeb21f40] [c0012f10] handle_page_fault+0xc/0x80 BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2386, name: freshclam Call Trace: [ee907da0] [c0008840] show_stack+0x70/0x1b4 (unreliable) [ee907dd0] [c0040af8] __might_sleep+0xf0/0xf4 [ee907de0] [c045ed0c] rt_spin_lock+0xa4/0xa8 [ee907df0] [c00d6190] unmap_vmas+0x1f0/0x690 [ee907e80] [c00db574] unmap_region+0xf0/0x214 [ee907ef0] [c00dca78] do_munmap+0x2b8/0x33c [ee907f20] [c00dcb44] sys_munmap+0x48/0x78 [ee907f40] [c0012ad0] ret_from_syscall+0x0/0x3c BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2372, name: nmbd Call Trace: [eeb21de0] [c0008840] show_stack+0x70/0x1b4 (unreliable) [eeb21e10] [c0040af8] __might_sleep+0xf0/0xf4 [eeb21e20] [c045ed0c] rt_spin_lock+0xa4/0xa8 [eeb21e30] [c00d750c] handle_mm_fault+0x43c/0x81c [eeb21e90] [c0017174] do_page_fault+0x214/0x4b0 [eeb21f40] [c0012f10] handle_page_fault+0xc/0x80 BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2391, name: sh Call Trace: [eea31b20] [c0008840] show_stack+0x70/0x1b4 (unreliable) [eea31b50] [c0040af8] __might_sleep+0xf0/0xf4 [eea31b60] [c045ed0c] rt_spin_lock+0xa4/0xa8 [eea31b70] [c00d7634] handle_mm_fault+0x564/0x81c [eea31bd0] [c0017174] do_page_fault+0x214/0x4b0 [eea31c80] [c0012f10] handle_page_fault+0xc/0x80 [eea31d40] [c00b9128] file_read_actor+0x27c/0x2d0 [eea31d70] [c00bbf38] generic_file_aio_read+0x364/0x79c [eea31e00] [c0198804] nfs_file_read+0x1a0/0x21c [eea31e30] [c00f12fc] do_sync_read+0xd0/0x15c [eea31ef0] [c00f238c] vfs_read+0xcc/0x19c [eea31f10] [c00f2594] sys_read+0x58/0xc8 [eea31f40] [c0012ad0] ret_from_syscall+0x0/0x3c BUG: sleeping function called from invalid context at kernel/rtmutex.c:684 in_atomic(): 1, irqs_disabled(): 0, pid: 2391, name: sh Call Trace: [eea31d50] [c0008840] show_stack+0x70/0x1b4 (unreliable) [eea31d80] [c0040af8] __might_sleep+0xf0/0xf4 [eea31d90] [c045ed0c] rt_spin_lock+0xa4/0xa8 [eea31da0] [c00d8bc4] copy_page_range+0x160/0x4dc [eea31e20] [c004dcec] dup_mm+0x2b4/0x3e4 [eea31e60] [c004ea1c] copy_process+0xbb4/0xfac [eea31ec0] [c004eeac] do_fork+0x98/0x3d4 [eea31f20] [c0008cb8] sys_clone+0x68/0xac [eea31f40] [c0012ad0] ret_from_syscall+0x0/0x3c -- Regards: Adeel Arshad -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
