[linux-next-20110718] Warning at fault_in_kernel_space()?
From: Tetsuo Handa
Date: Tue Jul 19 2011 - 23:58:25 EST
I got below warning.
[ 9.249851] Trying to unpack rootfs image as initramfs...
[ 9.253716] rootfs image is not initramfs (junk in compressed archive); looks like an initrd
[ 9.263123] debug: unmapping init memory f76f0000..f77fe000
[ 9.297491] DMA-API: preallocated 32768 debug entries
[ 9.301350] DMA-API: debugging enabled by kernel config
[ 9.303451] Simple Boot Flag at 0x36 set to 0x1
[ 9.315671] apm: BIOS version 1.2 Flags 0x03 (Driver version 1.16ac)
[ 9.318552] apm: disabled - APM is not SMP safe.
[ 9.324504] microcode: CPU0 sig=0x206a7, pf=0x1, revision=0x15
[ 9.326908] microcode: CPU1 sig=0x206a7, pf=0x1, revision=0x15
[ 9.329860] microcode: Microcode Update Driver: v2.00 <tigran@xxxxxxxxxxxxxxxxxxxx>, Peter Oruba
[ 9.338820] ------------[ cut here ]------------
[ 9.340774] WARNING: at kernel/lockdep.c:2529 trace_hardirqs_on_caller+0x7a/0x80()
[ 9.343709] Hardware name: VMware Virtual Platform
[ 9.348240] Modules linked in:
[ 9.349631] Pid: 1, comm: swapper Not tainted 3.0.0-rc7-next-20110718 #1
[ 9.352198] Call Trace:
[ 9.353197] [<c107055a>] ? trace_hardirqs_on_caller+0x7a/0x80
[ 9.355606] [<c103f35c>] warn_slowpath_common+0x7c/0xa0
[ 9.360224] [<c107055a>] ? trace_hardirqs_on_caller+0x7a/0x80
[ 9.362693] [<c1025ed0>] ? fault_in_kernel_space+0x10/0x10
[ 9.364807] [<c103f41d>] warn_slowpath_null+0x1d/0x40
[ 9.366834] [<c107055a>] trace_hardirqs_on_caller+0x7a/0x80
[ 9.372212] [<c11baef4>] trace_hardirqs_on_thunk+0xc/0x10
[ 9.374467] [<c107609b>] ? cmpxchg_futex_value_locked+0x3b/0x70
[ 9.376771] [<c1396c74>] ? restore_all+0xf/0xf
[ 9.378592] [<c111007b>] ? load_elf_binary+0x3db/0x920
[ 9.380436] [<c11100d8>] ? load_elf_binary+0x438/0x920
[ 9.382495] [<c1025ed0>] ? fault_in_kernel_space+0x10/0x10
[ 9.384710] [<c1397dcf>] ? iret_exc+0x3ff/0xa7d
[ 9.386559] [<c15a24b0>] ? lockdep_proc_init+0x90/0x90
[ 9.388302] [<c15a24cb>] ? futex_init+0x1b/0x90
[ 9.393397] [<c15a249e>] ? lockdep_proc_init+0x7e/0x90
[ 9.395459] [<c15a24b0>] ? lockdep_proc_init+0x90/0x90
[ 9.397379] [<c1001282>] ? do_one_initcall+0x102/0x110
[ 9.399473] [<c158c930>] ? do_pre_smp_initcalls+0x30/0x30
[ 9.404218] [<c158c8be>] ? do_initcalls+0x1e/0x30
[ 9.406081] [<c158c8f1>] ? do_basic_setup+0x21/0x30
[ 9.408052] [<c158c985>] ? kernel_init+0x55/0xe0
[ 9.409784] [<c139793a>] ? kernel_thread_helper+0x6/0xd
[ 9.411937] ---[ end trace 93d72a36b9146f22 ]---
[ 9.416336] Initializing RT-Tester: OK
[ 9.418005] audit: initializing netlink socket (disabled)
[ 9.420055] type=2000 audit(1311163396.724:1): initialized
[ 9.425632] highmem bounce pool size: 64 pages
[ 9.428123] VFS: Disk quotas dquot_6.5.2
[ 9.429898] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
If I change kernel/lockdep.c:2529 from
if (DEBUG_LOCKS_WARN_ON(!irqs_disabled()))
to
if (WARN_ON(!irqs_disabled()))
, I get similar warnings endlessly (shown below).
[ 18.557434] ------------[ cut here ]------------
[ 18.574852] WARNING: at kernel/lockdep.c:2529 trace_hardirqs_on_caller+0x7d/0x80()
[ 18.580561] Hardware name: VMware Virtual Platform
[ 18.598387] Modules linked in:
[ 18.600920] Pid: 1123, comm: linuxrc Tainted: G W 3.0.0-rc7-next-20110718 #2
[ 18.620546] Call Trace:
[ 18.622540] [<c107055d>] ? trace_hardirqs_on_caller+0x7d/0x80
[ 18.626858] [<c103f35c>] warn_slowpath_common+0x7c/0xa0
[ 18.644860] [<c107055d>] ? trace_hardirqs_on_caller+0x7d/0x80
[ 18.650114] [<c1396c74>] ? restore_all+0xf/0xf
[ 18.667377] [<c103f41d>] warn_slowpath_null+0x1d/0x40
[ 18.676310] [<c107055d>] trace_hardirqs_on_caller+0x7d/0x80
[ 18.681363] [<c1025ed0>] ? fault_in_kernel_space+0x10/0x10
[ 18.686333] [<c11baef4>] trace_hardirqs_on_thunk+0xc/0x10
[ 18.691361] [<c1396c74>] ? restore_all+0xf/0xf
[ 18.695414] [<c10b007b>] ? kswapd_try_to_sleep+0x8b/0x120
[ 18.700092] [<c1025ed0>] ? fault_in_kernel_space+0x10/0x10
[ 18.704788] [<c11baff2>] ? clear_user+0x42/0x60
[ 18.708813] [<c110f34f>] ? padzero+0x1f/0x30
[ 18.727615] [<c110ffb1>] ? load_elf_binary+0x311/0x920
[ 18.731604] [<c10d85a3>] ? search_binary_handler+0x1f3/0x2e0
[ 18.755901] [<c10d83eb>] ? search_binary_handler+0x3b/0x2e0
[ 18.760144] [<c110fca0>] ? randomize_stack_top+0x50/0x50
[ 18.778196] [<c10d82ce>] ? prepare_binprm+0xce/0xf0
[ 18.783561] [<c110f25b>] ? load_script+0x1eb/0x220
[ 18.788909] [<c107068b>] ? trace_hardirqs_off+0xb/0x10
[ 18.792843] [<c106150b>] ? local_clock+0x3b/0x60
[ 18.796438] [<c106cbb3>] ? lock_release_holdtime+0x73/0xb0
[ 18.801386] [<c10d859b>] ? search_binary_handler+0x1eb/0x2e0
[ 18.821502] [<c1072ba7>] ? __lock_release+0x47/0x70
[ 18.825222] [<c10d859b>] ? search_binary_handler+0x1eb/0x2e0
[ 18.829624] [<c10d85a3>] ? search_binary_handler+0x1f3/0x2e0
[ 18.848258] [<c10d83eb>] ? search_binary_handler+0x3b/0x2e0
[ 18.853348] [<c110f070>] ? lock_may_write+0xb0/0xb0
[ 18.871056] [<c1195ee9>] ? __ccs_search_binary_handler+0x49/0x50
[ 18.875714] [<c10d87f1>] ? do_execve_common+0x161/0x230
[ 18.879760] [<c10d88d4>] ? do_execve+0x14/0x20
[ 18.883153] [<c1009f12>] ? sys_execve+0x42/0x60
[ 18.900931] [<c1397483>] ? ptregs_execve+0x13/0x18
[ 18.904909] [<c1396c41>] ? syscall_call+0x7/0xb
[ 18.923179] [<c107007b>] ? print_irqtrace_events+0xbb/0xf0
[ 18.927407] [<c1006c22>] ? kernel_execve+0x22/0x40
[ 18.939865] [<c158d8e0>] ? no_initrd+0x20/0x20
[ 18.968307] [<c158d91b>] ? do_linuxrc+0x3b/0x50
[ 18.971874] [<c139793a>] ? kernel_thread_helper+0x6/0xd
[ 18.975808] ---[ end trace 93d72a36b9146f24 ]---
[ 20.546150] ------------[ cut here ]------------
[ 20.561973] WARNING: at kernel/lockdep.c:2529 trace_hardirqs_on_caller+0x7d/0x80()
[ 20.566868] Hardware name: VMware Virtual Platform
[ 20.570000] Modules linked in:
[ 20.584441] Pid: 1125, comm: linuxrc Tainted: G W 3.0.0-rc7-next-20110718 #2
[ 20.589499] Call Trace:
[ 20.591227] [<c107055d>] ? trace_hardirqs_on_caller+0x7d/0x80
[ 20.607542] [<c103f35c>] warn_slowpath_common+0x7c/0xa0
[ 20.611024] [<c107055d>] ? trace_hardirqs_on_caller+0x7d/0x80
[ 20.614805] [<c1396c74>] ? restore_all+0xf/0xf
[ 20.630005] [<c103f41d>] warn_slowpath_null+0x1d/0x40
[ 20.633332] [<c107055d>] trace_hardirqs_on_caller+0x7d/0x80
[ 20.651072] [<c1025ed0>] ? fault_in_kernel_space+0x10/0x10
[ 20.654850] [<c11baef4>] trace_hardirqs_on_thunk+0xc/0x10
[ 20.658441] [<c1396c74>] ? restore_all+0xf/0xf
[ 20.673716] [<c10b00d8>] ? kswapd_try_to_sleep+0xe8/0x120
[ 20.677272] [<c1025ed0>] ? fault_in_kernel_space+0x10/0x10
[ 20.680896] [<c11bac6d>] ? __put_user_4+0x11/0x18
[ 20.684077] [<c10373fb>] ? schedule_tail+0x6b/0xb0
[ 20.699723] [<c1397326>] ? ret_from_fork+0x6/0x1c
[ 20.702918] ---[ end trace 93d72a36b9146f2a ]---
[ 23.127127] ------------[ cut here ]------------
[ 23.130191] WARNING: at kernel/lockdep.c:2529 trace_hardirqs_on_caller+0x7d/0x80()
[ 23.149369] Hardware name: VMware Virtual Platform
[ 23.152552] Modules linked in:
[ 23.154780] Pid: 1, comm: init Tainted: G W 3.0.0-rc7-next-20110718 #2
[ 23.171650] Call Trace:
[ 23.173342] [<c107055d>] ? trace_hardirqs_on_caller+0x7d/0x80
[ 23.177146] [<c103f35c>] warn_slowpath_common+0x7c/0xa0
[ 23.193121] [<c107055d>] ? trace_hardirqs_on_caller+0x7d/0x80
[ 23.196948] [<c1396c74>] ? restore_all+0xf/0xf
[ 23.199964] [<c103f41d>] warn_slowpath_null+0x1d/0x40
[ 23.215490] [<c107055d>] trace_hardirqs_on_caller+0x7d/0x80
[ 23.219188] [<c1025ed0>] ? fault_in_kernel_space+0x10/0x10
[ 23.222793] [<c11baef4>] trace_hardirqs_on_thunk+0xc/0x10
[ 23.238699] [<c1396c74>] ? restore_all+0xf/0xf
[ 23.241720] [<c10a007b>] ? perf_output_copy+0x2b/0x90
[ 23.245082] [<c1025ed0>] ? fault_in_kernel_space+0x10/0x10
[ 23.266032] [<c10a26a8>] ? file_read_actor+0x48/0xe0
[ 23.281508] [<c10a23d5>] ? do_generic_file_read+0x205/0x490
[ 23.285140] [<c10a2a11>] ? generic_file_aio_read+0x241/0x2a0
[ 23.288844] [<c10a2660>] ? do_generic_file_read+0x490/0x490
[ 23.304893] [<c1026068>] ? do_page_fault+0x198/0x400
[ 23.308258] [<c10d1430>] ? do_sync_read+0xa0/0xe0
[ 23.311451] [<c10d12a2>] ? rw_verify_area+0x62/0x110
[ 23.327110] [<c10d1514>] ? vfs_read+0xa4/0x130
[ 23.330163] [<c1396c74>] ? restore_all+0xf/0xf
[ 23.333155] [<c10d17f1>] ? sys_read+0x41/0x70
[ 23.350293] [<c1396c41>] ? syscall_call+0x7/0xb
[ 23.353372] ---[ end trace 93d72a36b9146f33 ]---
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