Hello, I searched lkml and found the following report (titled reiserfs locking): http://lkml.org/lkml/2010/4/15/389 (Fri, 16 Apr 2010) I can see this backtrace while configuring emacs: [ 6136.579013] [ 6136.579015] ======================================================= [ 6136.579021] [ INFO: possible circular locking dependency detected ] [ 6136.579025] 2.6.35-rc3-dbg-git3-00350-g94d119f #61 [ 6136.579027] ------------------------------------------------------- [ 6136.579031] conftest/13950 is trying to acquire lock: [ 6136.579034] (&sb->s_type->i_mutex_key#10){+.+.+.}, at: [<c10f1cf6>] reiserfs_file_release+0x11d/0x344 [ 6136.579050] [ 6136.579051] but task is already holding lock: [ 6136.579054] (&mm->mmap_sem){++++++}, at: [<c1091b87>] sys_munmap+0x26/0x42 [ 6136.579064] [ 6136.579065] which lock already depends on the new lock. [ 6136.579066] [ 6136.579069] [ 6136.579070] the existing dependency chain (in reverse order) is: [ 6136.579073] [ 6136.579074] -> #1 (&mm->mmap_sem){++++++}: [ 6136.579081] [<c104f53a>] lock_acquire+0x59/0x70 [ 6136.579089] [<c108cf78>] might_fault+0x53/0x70 [ 6136.579094] [<c11853b8>] copy_to_user+0x30/0x48 [ 6136.579101] [<c10afaf9>] filldir64+0x95/0xc9 [ 6136.579106] [<c10f2504>] reiserfs_readdir_dentry+0x35d/0x4d9 [ 6136.579112] [<c10f2692>] reiserfs_readdir+0x12/0x17 [ 6136.579117] [<c10afd17>] vfs_readdir+0x6d/0x92 [ 6136.579122] [<c10afe91>] sys_getdents64+0x63/0xa2 [ 6136.579127] [<c10027d3>] sysenter_do_call+0x12/0x32 [ 6136.579134] [ 6136.579135] -> #0 (&sb->s_type->i_mutex_key#10){+.+.+.}: [ 6136.579142] [<c104ef30>] __lock_acquire+0x96d/0xbe1 [ 6136.579148] [<c104f53a>] lock_acquire+0x59/0x70 [ 6136.579153] [<c12c5614>] __mutex_lock_common+0x39/0x36b [ 6136.579160] [<c12c5980>] mutex_lock_nested+0x12/0x15 [ 6136.579165] [<c10f1cf6>] reiserfs_file_release+0x11d/0x344 [ 6136.579171] [<c10a580d>] fput+0xe0/0x16a [ 6136.579177] [<c1090ca6>] remove_vma+0x28/0x47 [ 6136.579182] [<c1091a68>] do_munmap+0x1e8/0x200 [ 6136.579188] [<c1091b93>] sys_munmap+0x32/0x42 [ 6136.579193] [<c10027d3>] sysenter_do_call+0x12/0x32 [ 6136.579198] [ 6136.579199] other info that might help us debug this: [ 6136.579200] [ 6136.579204] 1 lock held by conftest/13950: [ 6136.579207] #0: (&mm->mmap_sem){++++++}, at: [<c1091b87>] sys_munmap+0x26/0x42 [ 6136.579216] [ 6136.579217] stack backtrace: [ 6136.579221] Pid: 13950, comm: conftest Not tainted 2.6.35-rc3-dbg-git3-00350-g94d119f #61 [ 6136.579225] Call Trace: [ 6136.579230] [<c12c4893>] ? printk+0xf/0x11 [ 6136.579235] [<c104dbdd>] print_circular_bug+0x8a/0x96 [ 6136.579241] [<c104ef30>] __lock_acquire+0x96d/0xbe1 [ 6136.579247] [<c104e436>] ? mark_lock+0x26/0x1b3 [ 6136.579254] [<c104f53a>] lock_acquire+0x59/0x70 [ 6136.579259] [<c10f1cf6>] ? reiserfs_file_release+0x11d/0x344 [ 6136.579265] [<c12c5614>] __mutex_lock_common+0x39/0x36b [ 6136.579270] [<c10f1cf6>] ? reiserfs_file_release+0x11d/0x344 [ 6136.579276] [<c1084375>] ? release_pages+0x55/0x116 [ 6136.579282] [<c12c5980>] mutex_lock_nested+0x12/0x15 [ 6136.579287] [<c10f1cf6>] ? reiserfs_file_release+0x11d/0x344 [ 6136.579293] [<c10f1cf6>] reiserfs_file_release+0x11d/0x344 [ 6136.579299] [<c10a57bd>] ? fput+0x90/0x16a [ 6136.579304] [<c10a580d>] fput+0xe0/0x16a [ 6136.579309] [<c1090ca6>] remove_vma+0x28/0x47 [ 6136.579314] [<c1091819>] ? arch_unmap_area_topdown+0x0/0x18 [ 6136.579319] [<c1091a68>] do_munmap+0x1e8/0x200 [ 6136.579325] [<c1091b93>] sys_munmap+0x32/0x42 [ 6136.579330] [<c10027d3>] sysenter_do_call+0x12/0x32 So, below is the simple code which produces similar result: [ 573.405720] [ 573.405722] ======================================================= [ 573.405728] [ INFO: possible circular locking dependency detected ] [ 573.405732] 2.6.35-rc3-dbg-git6-00502-g94feaba-dirty #65 [ 573.405735] ------------------------------------------------------- [ 573.405739] a.out/7287 is trying to acquire lock: [ 573.405742] (&sb->s_type->i_mutex_key#10){+.+.+.}, at: [<c10f1d4e>] reiserfs_file_release+0x11d/0x344 [ 573.405758] [ 573.405759] but task is already holding lock: [ 573.405762] (&mm->mmap_sem){++++++}, at: [<c1092937>] sys_mmap_pgoff+0xa4/0xe7 [ 573.405772] [ 573.405773] which lock already depends on the new lock. [ 573.405774] [ 573.405777] [ 573.405778] the existing dependency chain (in reverse order) is: [ 573.405781] [ 573.405782] -> #1 (&mm->mmap_sem){++++++}: [ 573.405789] [<c104f566>] lock_acquire+0x59/0x70 [ 573.405797] [<c108cf70>] might_fault+0x53/0x70 [ 573.405803] [<c1185418>] copy_to_user+0x30/0x48 [ 573.405809] [<c10afaf9>] filldir64+0x95/0xc9 [ 573.405815] [<c10f255c>] reiserfs_readdir_dentry+0x35d/0x4d9 [ 573.405821] [<c10f26ea>] reiserfs_readdir+0x12/0x17 [ 573.405827] [<c10afd17>] vfs_readdir+0x6d/0x92 [ 573.405831] [<c10afe91>] sys_getdents64+0x63/0xa2 [ 573.405836] [<c10027d3>] sysenter_do_call+0x12/0x32 [ 573.405843] [ 573.405843] -> #0 (&sb->s_type->i_mutex_key#10){+.+.+.}: [ 573.405851] [<c104ef5c>] __lock_acquire+0x96d/0xbe1 [ 573.405857] [<c104f566>] lock_acquire+0x59/0x70 [ 573.405862] [<c12c5674>] __mutex_lock_common+0x39/0x36b [ 573.405869] [<c12c59e0>] mutex_lock_nested+0x12/0x15 [ 573.405874] [<c10f1d4e>] reiserfs_file_release+0x11d/0x344 [ 573.405880] [<c10a5805>] fput+0xe0/0x16a [ 573.405886] [<c1090c9e>] remove_vma+0x28/0x47 [ 573.405892] [<c1091a60>] do_munmap+0x1e8/0x200 [ 573.405897] [<c109230a>] mmap_region+0x6b/0x372 [ 573.405902] [<c109284d>] do_mmap_pgoff+0x23c/0x282 [ 573.405908] [<c1092950>] sys_mmap_pgoff+0xbd/0xe7 [ 573.405913] [<c10027d3>] sysenter_do_call+0x12/0x32 [ 573.405919] [ 573.405920] other info that might help us debug this: [ 573.405921] [ 573.405925] 1 lock held by a.out/7287: [ 573.405928] #0: (&mm->mmap_sem){++++++}, at: [<c1092937>] sys_mmap_pgoff+0xa4/0xe7 [ 573.405937] [ 573.405938] stack backtrace: [ 573.405942] Pid: 7287, comm: a.out Not tainted 2.6.35-rc3-dbg-git6-00502-g94feaba-dirty #65 [ 573.405946] Call Trace: [ 573.405951] [<c12c48f3>] ? printk+0xf/0x11 [ 573.405957] [<c104dc09>] print_circular_bug+0x8a/0x96 [ 573.405962] [<c104ef5c>] __lock_acquire+0x96d/0xbe1 [ 573.405969] [<c104e462>] ? mark_lock+0x26/0x1b3 [ 573.405975] [<c104f566>] lock_acquire+0x59/0x70 [ 573.405980] [<c10f1d4e>] ? reiserfs_file_release+0x11d/0x344 [ 573.405986] [<c12c5674>] __mutex_lock_common+0x39/0x36b [ 573.405991] [<c10f1d4e>] ? reiserfs_file_release+0x11d/0x344 [ 573.405997] [<c12c59e0>] mutex_lock_nested+0x12/0x15 [ 573.406003] [<c10f1d4e>] ? reiserfs_file_release+0x11d/0x344 [ 573.406008] [<c10f1d4e>] reiserfs_file_release+0x11d/0x344 [ 573.406014] [<c10a57b5>] ? fput+0x90/0x16a [ 573.406019] [<c10a5805>] fput+0xe0/0x16a [ 573.406024] [<c1090c9e>] remove_vma+0x28/0x47 [ 573.406030] [<c1091811>] ? arch_unmap_area_topdown+0x0/0x18 [ 573.406035] [<c1091a60>] do_munmap+0x1e8/0x200 [ 573.406040] [<c109230a>] mmap_region+0x6b/0x372 [ 573.406046] [<c109284d>] do_mmap_pgoff+0x23c/0x282 [ 573.406052] [<c1092950>] sys_mmap_pgoff+0xbd/0xe7 [ 573.406058] [<c10027d3>] sysenter_do_call+0x12/0x32 As well as this: [ 202.300464] REISERFS error (device sda9): vs-2100 add_save_link: search_by_key ([-1 7812832 0x1 IND]) returned 1 [ 202.300473] REISERFS (device sda9): Remounting filesystem read-only [ 202.301603] ------------[ cut here ]------------ [ 202.301615] WARNING: at fs/reiserfs/journal.c:3436 journal_end+0x5b/0xaf() [ 202.301619] Hardware name: F3JC [ 202.301622] Modules linked in: snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_hda_codec_si3054 snd_hda_codec_realtek snd_hwdep snd_pcm_oss snd_mixer_oss asus_laptop sparse_keymap sdhci_pci sdhci snd_hda_intel mmc_core led_class snd_hda_codec rng_core snd_pcm snd_timer snd_page_alloc snd i2c_i801 soundcore psmouse sg evdev serio_raw r8169 mii usbhid hid uhci_hcd ehci_hcd sr_mod usbcore cdrom sd_mod ata_piix [ 202.301689] Pid: 5055, comm: a.out Not tainted 2.6.35-rc3-dbg-git6-00502-g94feaba-dirty #65 [ 202.301693] Call Trace: [ 202.301701] [<c102e3a2>] warn_slowpath_common+0x65/0x7a [ 202.301707] [<c1102d95>] ? journal_end+0x5b/0xaf [ 202.301712] [<c102e3c6>] warn_slowpath_null+0xf/0x13 [ 202.301718] [<c1102d95>] journal_end+0x5b/0xaf [ 202.301725] [<c10eebaa>] reiserfs_truncate_file+0x19f/0x233 [ 202.301733] [<c10f1ba1>] reiserfs_vfs_truncate_file+0xd/0xf [ 202.301738] [<c1084883>] vmtruncate+0x23/0x29 [ 202.301745] [<c10b4ad4>] inode_setattr+0x47/0x68 [ 202.301751] [<c10f1b3f>] reiserfs_setattr+0x242/0x297 [ 202.301758] [<c12c5d05>] ? down_write+0x22/0x2a [ 202.301764] [<c10b4d6f>] notify_change+0x15c/0x26b [ 202.301770] [<c10a35c7>] do_truncate+0x64/0x7d [ 202.301776] [<c12c69b0>] ? _raw_spin_unlock+0x33/0x3f [ 202.301783] [<c10ad892>] do_last+0x450/0x459 [ 202.301789] [<c10ada5b>] do_filp_open+0x1c0/0x41a [ 202.301798] [<c1029081>] ? get_parent_ip+0xb/0x31 [ 202.301804] [<c1029123>] ? sub_preempt_count+0x7c/0x89 [ 202.301810] [<c10b5746>] ? alloc_fd+0xb4/0xbf [ 202.301816] [<c10a3f46>] do_sys_open+0x48/0xdf [ 202.301821] [<c10a3ffb>] sys_open+0x1e/0x26 [ 202.301827] [<c10027d3>] sysenter_do_call+0x12/0x32 [ 202.301833] ---[ end trace c4e3312bdadd2dc5 ]--- [ 202.301864] REISERFS warning (device sda9): clm-6006 reiserfs_dirty_inode: writing inode 7812832 on readonly FS [ 202.302011] REISERFS warning (device sda9): clm-6006 reiserfs_dirty_inode: writing inode 7812832 on readonly FS [ 202.302396] ------------[ cut here ]------------ [ 202.302403] WARNING: at fs/reiserfs/journal.c:3436 journal_end+0x5b/0xaf() [ 202.302406] Hardware name: F3JC [ 202.302409] Modules linked in: snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_hda_codec_si3054 snd_hda_codec_realtek snd_hwdep snd_pcm_oss snd_mixer_oss asus_laptop sparse_keymap sdhci_pci sdhci snd_hda_intel mmc_core led_class snd_hda_codec rng_core snd_pcm snd_timer snd_page_alloc snd i2c_i801 soundcore psmouse sg evdev serio_raw r8169 mii usbhid hid uhci_hcd ehci_hcd sr_mod usbcore cdrom sd_mod ata_piix [ 202.302466] Pid: 4951, comm: a.out Tainted: G W 2.6.35-rc3-dbg-git6-00502-g94feaba-dirty #65 [ 202.302470] Call Trace: [ 202.302476] [<c102e3a2>] warn_slowpath_common+0x65/0x7a [ 202.302481] [<c1102d95>] ? journal_end+0x5b/0xaf [ 202.302487] [<c102e3c6>] warn_slowpath_null+0xf/0x13 [ 202.302492] [<c1102d95>] journal_end+0x5b/0xaf [ 202.302497] [<c10fd687>] ? reiserfs_delete_object+0x29/0x60 [ 202.302503] [<c10ee1ee>] reiserfs_delete_inode+0xc4/0x100 [ 202.302510] [<c10b4265>] generic_delete_inode+0x72/0xc2 [ 202.302515] [<c10b42c6>] generic_drop_inode+0x11/0x4c [ 202.302520] [<c10b37ff>] iput+0x49/0x4c [ 202.302525] [<c10b165e>] dentry_iput+0x9a/0xb3 [ 202.302530] [<c10b16a4>] d_kill+0x2d/0x47 [ 202.302534] [<c10b1c94>] dput+0xdf/0xe8 [ 202.302540] [<c10a5872>] fput+0x14d/0x16a [ 202.302546] [<c1090c9e>] remove_vma+0x28/0x47 [ 202.302551] [<c1091c29>] exit_mmap+0x8e/0xa6 [ 202.302556] [<c102c4b3>] mmput+0x24/0xab [ 202.302561] [<c102fd83>] exit_mm+0xe8/0xf0 [ 202.302567] [<c1031295>] do_exit+0x1b7/0x5cb [ 202.302573] [<c10434a6>] ? up_read+0x1d/0x23 [ 202.302578] [<c10318b3>] do_group_exit+0x60/0x83 [ 202.302584] [<c10318e9>] sys_exit_group+0x13/0x17 [ 202.302589] [<c10027d3>] sysenter_do_call+0x12/0x32 [ 202.302594] ---[ end trace c4e3312bdadd2dc6 ]--- ==== code ==== conftest.c /* 2010, Sergey Senozhatsky. GPLv2 Description: We have several PIDs working with conftest.mmap. Actually this is (seems) what hapenning during emacs configure. traced emacs configure: vfork() ... ==== ... PID 5446 5446 open("conftest.mmap", O_WRONLY|O_CREAT|O_TRUNC|O_LARGEFILE, 0600) = 3 write(3, "g\306isQ\377J\354)\315\272\253\362\373\343F|\302T\370\33\350\347\215vZ.c3\237\311\232"..., 4096) = 4096 close(3) = 0 open("conftest.txt", O_RDWR|O_CREAT|O_TRUNC|O_LARGEFILE, 0600) = 3 write(3, "\0", 1) = 1 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_SHARED, 3, 0) = 0xb78a8000 close(3) = 0 munmap(0xb78a8000, 4096) = 0 open("conftest.mmap", O_RDWR|O_LARGEFILE) = 3 mmap2(0xb78a8000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0) = 0xb78a8000 read(3, "*****"..., 4096) = 4096 close(3) = 0 open(".", O_RDONLY|O_LARGEFILE) = 3 close(3) = 0 fstatat64(AT_FDCWD, "conftest.mmap", {st_mode=S_IFREG|0600, st_size=4096, ...}, AT_SYMLINK_NOFOLLOW) = 0 unlinkat(AT_FDCWD, "conftest.mmap", 0) = 0 ==== ... PID 5449 5449 fstatat64(AT_FDCWD, "conftest.mmap", {st_mode=S_IFREG|0600, st_size=4096, ...}, AT_SYMLINK_NOFOLLOW) = 0 5449 unlinkat(AT_FDCWD, "conftest.mmap", 0) = 0 5449 execve("/bin/rm", ["rm", "-f", "conftest.mmap", "conftest.txt"] .. */ /* The code below produces: [ 46.727489] ======================================================= [ 46.727495] [ INFO: possible circular locking dependency detected ] [ 46.727499] 2.6.35-rc3-dbg-git5-00446-g36336bc-dirty #64 [ 46.727503] ------------------------------------------------------- [ 46.727506] a.out/5840 is trying to acquire lock: [ 46.727510] (&sb->s_type->i_mutex_key#10){+.+.+.}, at: [<c10f1d5c>] reiserfs_file_release+0x12b/0x367 [ 46.727526] [ 46.727527] but task is already holding lock: [ 46.727530] (&mm->mmap_sem){++++++}, at: [<c1092937>] sys_mmap_pgoff+0xa4/0xe7 [ 46.727540] [ 46.727541] which lock already depends on the new lock. [ 46.727543] [ 46.727546] [ 46.727546] the existing dependency chain (in reverse order) is: [ 46.727550] [ 46.727551] -> #1 (&mm->mmap_sem){++++++}: [ 46.727557] [<c104f566>] lock_acquire+0x59/0x70 [ 46.727565] [<c108cf70>] might_fault+0x53/0x70 [ 46.727571] [<c1185438>] copy_to_user+0x30/0x48 [ 46.727578] [<c10afaf9>] filldir64+0x95/0xc9 [ 46.727584] [<c10f257c>] reiserfs_readdir_dentry+0x35d/0x4d9 [ 46.727590] [<c10f270a>] reiserfs_readdir+0x12/0x17 [ 46.727596] [<c10afd17>] vfs_readdir+0x6d/0x92 [ 46.727600] [<c10afe91>] sys_getdents64+0x63/0xa2 [ 46.727606] [<c10027d3>] sysenter_do_call+0x12/0x32 [ 46.727612] [ 46.727613] -> #0 (&sb->s_type->i_mutex_key#10){+.+.+.}: [ 46.727621] [<c104ef5c>] __lock_acquire+0x96d/0xbe1 [ 46.727626] [<c104f566>] lock_acquire+0x59/0x70 [ 46.727632] [<c12c5694>] __mutex_lock_common+0x39/0x36b [ 46.727639] [<c12c5a00>] mutex_lock_nested+0x12/0x15 [ 46.727644] [<c10f1d5c>] reiserfs_file_release+0x12b/0x367 [ 46.727650] [<c10a5805>] fput+0xe0/0x16a [ 46.727657] [<c1090c9e>] remove_vma+0x28/0x47 [ 46.727662] [<c1091a60>] do_munmap+0x1e8/0x200 [ 46.727667] [<c109230a>] mmap_region+0x6b/0x372 [ 46.727672] [<c109284d>] do_mmap_pgoff+0x23c/0x282 [ 46.727678] [<c1092950>] sys_mmap_pgoff+0xbd/0xe7 [ 46.727683] [<c10027d3>] sysenter_do_call+0x12/0x32 [ 46.727689] [ 46.727690] other info that might help us debug this: [ 46.727691] [ 46.727695] 1 lock held by a.out/5840: [ 46.727698] #0: (&mm->mmap_sem){++++++}, at: [<c1092937>] sys_mmap_pgoff+0xa4/0xe7 [ 46.727707] [ 46.727708] stack backtrace: [ 46.727713] Pid: 5840, comm: a.out Not tainted 2.6.35-rc3-dbg-git5-00446-g36336bc-dirty #64 [ 46.727717] Call Trace: [ 46.727722] [<c12c4913>] ? printk+0xf/0x11 [ 46.727728] [<c104dc09>] print_circular_bug+0x8a/0x96 [ 46.727734] [<c104ef5c>] __lock_acquire+0x96d/0xbe1 [ 46.727740] [<c104ccc8>] ? look_up_lock_class+0x6c/0x7b [ 46.727746] [<c104e462>] ? mark_lock+0x26/0x1b3 [ 46.727752] [<c104f566>] lock_acquire+0x59/0x70 [ 46.727758] [<c10f1d5c>] ? reiserfs_file_release+0x12b/0x367 [ 46.727764] [<c12c5694>] __mutex_lock_common+0x39/0x36b [ 46.727769] [<c10f1d5c>] ? reiserfs_file_release+0x12b/0x367 [ 46.727775] [<c12c5a00>] mutex_lock_nested+0x12/0x15 [ 46.727781] [<c10f1d5c>] ? reiserfs_file_release+0x12b/0x367 [ 46.727786] [<c10f1d5c>] reiserfs_file_release+0x12b/0x367 [ 46.727792] [<c108d77d>] ? free_pgd_range+0x96/0x12f [ 46.727798] [<c10a57b5>] ? fput+0x90/0x16a [ 46.727803] [<c10a5805>] fput+0xe0/0x16a [ 46.727808] [<c1090c9e>] remove_vma+0x28/0x47 [ 46.727814] [<c1091811>] ? arch_unmap_area_topdown+0x0/0x18 [ 46.727819] [<c1091a60>] do_munmap+0x1e8/0x200 [ 46.727825] [<c109230a>] mmap_region+0x6b/0x372 [ 46.727831] [<c109284d>] do_mmap_pgoff+0x23c/0x282 [ 46.727837] [<c1092950>] sys_mmap_pgoff+0xbd/0xe7 [ 46.727842] [<c10027d3>] sysenter_do_call+0x12/0x32 */ #define _GNU_SOURCE #include <stdio.h> #include <sys/types.h> #include <sys/stat.h> #include <unistd.h> #include <fcntl.h> #include <sys/mman.h> int main() { char buf[4096]; int i = 0; /* we don't really care */ for (; i < 4096; i++) buf[i] = (i + 65) % 255; for (i = 0; i < 10; i++) { int pid = fork(); if (pid > 0 ) { printf("parent..."); } else if (pid == 0) { printf("child...\n"); int fd = open("conftest.mmap", O_WRONLY|O_CREAT|O_TRUNC|O_LARGEFILE, 0600); if (fd > 0) { printf("OPEN ok %d\n", fd); if (write(fd, buf, 4096) < 0) printf("WRITE error\n"); else printf("WRITE ok\n"); close(fd); } else { printf("OPEN error\n"); } fd = open("conftest.mmap", O_RDWR|O_LARGEFILE); if (fd > 0) { printf("OPEN conftest.mmap %d\n", fd); void *map = mmap((void*)0xb78a8000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, fd, 0); if (map == MAP_FAILED) { printf("MMAP failed\n"); goto out; } else { printf("MMAP ok\n"); } if (read(fd, buf, 4096) < 0) printf("READ failed\n"); else printf("READ ok\n"); close(fd); } else { printf("Error: can't open conftest.mmap\n"); } out: fd = open(".", O_RDONLY|O_LARGEFILE); if (fd > 0) { printf("OPEN . ok %d... closing\n", fd); close(fd); } else { printf("OPEN error\n"); } struct stat _stat; if (fstatat(AT_FDCWD, "conftest.mmap", &_stat, AT_SYMLINK_NOFOLLOW) < 0) printf("FSTATAT error\n"); else printf("FSTATAT ok\n"); if (unlinkat(AT_FDCWD, "conftest.mmap", 0) < 0) printf("UNLINKAT error\n"); else printf("UNLINKAT ok\n"); } else { printf("FORK error\n"); } } return 0; }
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