Greetings, I got the below dmesg and the first bad commit is commit 4b93dc9b1c684d0587fe44d36bbfdf45bd3bea9d Author: Tejun Heo AuthorDate: Thu Nov 28 14:54:43 2013 -0500 Commit: Greg Kroah-Hartman CommitDate: Fri Nov 29 18:16:08 2013 -0800 sysfs, kernfs: prepare mount path for kernfs We're in the process of separating out core sysfs functionality into kernfs which will deal with sysfs_dirents directly. This patch rearranges mount path so that the kernfs and sysfs parts are separate. * As sysfs_super_info won't be visible outside kernfs proper, kernfs_super_ns() is added to allow kernfs users to access a super_block's namespace tag. * Generic mount operation is separated out into kernfs_mount_ns(). sysfs_mount() now just performs sysfs-specific permission check, acquires namespace tag, and invokes kernfs_mount_ns(). * Generic superblock release is separated out into kernfs_kill_sb() which can be used directly as file_system_type->kill_sb(). As sysfs needs to put the namespace tag, sysfs_kill_sb() wraps kernfs_kill_sb() with ns tag put. * sysfs_dir_cachep init and sysfs_inode_init() are separated out into kernfs_init(). kernfs_init() uses only small amount of memory and trying to handle and propagate kernfs_init() failure doesn't make much sense. Use SLAB_PANIC for sysfs_dir_cachep and make sysfs_inode_init() panic on failure. After this change, kernfs_init() should be called before sysfs_init(), fs/namespace.c::mnt_init() modified accordingly. Signed-off-by: Tejun Heo Cc: linux-fsdevel@vger.kernel.org Cc: Christoph Hellwig Signed-off-by: Greg Kroah-Hartman +-----------------------------------------------------------------------------+----+ | | | +-----------------------------------------------------------------------------+----+ | boot_successes | 9 | | boot_failures | 10 | | BUG:sleeping_function_called_from_invalid_context_at_kernel/locking/rwsem.c | 10 | +-----------------------------------------------------------------------------+----+ [ 1.488272] tsc: Refined TSC clocksource calibration: 2892.983 MHz [ 67.140822] general protection fault: 0000 [#1] [ 67.141478] CPU: 0 PID: 359 Comm: umount Not tainted 3.13.0-rc2-next-20131204-02848-g9a96b57 #153 [ 67.141478] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 67.141478] task: ffff88000be9c150 ti: ffff88000b8a2000 task.ti: ffff88000b8a2000 [ 67.141478] RIP: 0010:[] [] net_drop_ns+0xd/0x40 [ 67.141478] RSP: 0018:ffff88000b8a3e80 EFLAGS: 00010282 [ 67.141478] RAX: ffffffff81878e10 RBX: a56b6b6b6b6b6b6b RCX: 00000001002e000f [ 67.141478] RDX: 00000001002e0010 RSI: a56b6b6b6b6b6b6b RDI: a56b6b6b6b6b6b6b [ 67.141478] RBP: ffff88000b8a3e88 R08: 0000000000000000 R09: 0000000000000000 [ 67.141478] R10: ffff88000b811d20 R11: ffff88000f801c80 R12: ffffffff8203f7a0 [ 67.141478] R13: 0000000000000000 R14: ffff88000b867dd0 R15: ffff88000b867da0 [ 67.141478] FS: 00007fbd06beb700(0000) GS:ffffffff8201c000(0000) knlGS:0000000000000000 [ 67.141478] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 67.141478] CR2: 00000000004060f0 CR3: 000000000b855000 CR4: 00000000000006f0 [ 67.141478] Stack: [ 67.141478] ffff88000bf24038 ffff88000b8a3e98 ffffffff8144bbda ffff88000b8a3eb0 [ 67.141478] ffffffff8117eb02 ffff88000bf24038 ffff88000b8a3ed0 ffffffff81119fd5 [ 67.141478] ffff88000bf24038 ffff88000b867da0 ffff88000b8a3ee8 ffffffff8111a040 [ 67.141478] Call Trace: [ 67.141478] [] kobj_ns_drop+0x3a/0x40 [ 67.141478] [] sysfs_kill_sb+0x22/0x30 [ 67.141478] [] deactivate_locked_super+0x35/0x60 [ 67.141478] [] deactivate_super+0x40/0x60 [ 67.141478] [] mntput_no_expire+0xda/0x1b0 [ 67.141478] [] SyS_umount+0x8b/0x390 [ 67.141478] [] system_call_fastpath+0x16/0x1b [ 67.141478] Code: ff ff 49 83 7c 24 30 00 0f 85 e6 fe ff ff e9 fb fe ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 55 48 85 ff 48 89 e5 53 48 89 fb 74 04 0f 74 07 5b 5d c3 0f 1f 40 00 48 8b bf 48 05 00 00 e8 bc 47 [ 67.141478] RIP [] net_drop_ns+0xd/0x40 [ 67.141478] RSP [ 67.188547] ---[ end trace f8632d807e5afcad ]--- [ 67.189485] BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:20 git bisect start e817290b845ad62b681bc0d2b86feb4c6577789e v3.12 -- git bisect good f47671e2d861a2093179cd64dda22016664b2015 # 20:57 40+ 0 Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm git bisect good 041b499bb1b88512b96b411a1695a86f32ee55d5 # 21:18 40+ 0 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/iwlwifi/iwlwifi-fixes git bisect good 3f1059e0c14f69d2e6f09855a96ca08e6239f244 # 21:26 40+ 0 Merge remote-tracking branch 'v9fs/for-next' git bisect good 6deb58a96f4d1befbc6831f4212963bd0093e181 # 21:32 40+ 0 Merge remote-tracking branch 'watchdog/master' git bisect good e2f6df943892654b221a27f0be66c838c2c2bbed # 21:38 40+ 0 staging: comedi: pcl812: tidy up the irq support in pcl812_attach() git bisect good 4d29576b668aeca8d604e0d3db7722f4cb84884a # 22:16 40+ 0 Merge remote-tracking branch 'leds/for-next' git bisect bad 5bbc0c5bc993ccc43b0e99bb2412e41b98aedaa1 # 22:28 9- 5 Merge remote-tracking branch 'char-misc/char-misc-next' git bisect good a458677db6a928535a7186248983d1e192142e83 # 22:33 40+ 0 usb: host: Remove superfluous name casts git bisect good 2072f1afddfe9fa00c1c0c79f8986707324ec65b # 23:03 40+ 0 sysfs, kernfs: move symlink core code to fs/kernfs/symlink.c git bisect bad eaac12be57a276ad7da60a1dc3dd8cd54bc9817c # 23:17 4- 5 Merge remote-tracking branch 'usb/usb-next' git bisect good df394fb56c64244b30b442e9e02de1a2d9c5a98b # 00:14 40+ 0 sysfs, kernfs: make super_blocks bind to different kernfs_roots git bisect bad ac9bba031001704a2339713cc12148857eccc5e5 # 00:32 2- 1 sysfs, kernfs: implement kernfs_ns_enabled() git bisect bad fa736a951e456b996a76826ba78ff974414c3b55 # 00:47 3- 1 sysfs, kernfs: move mount core code to fs/kernfs/mount.c git bisect bad 4b93dc9b1c684d0587fe44d36bbfdf45bd3bea9d # 01:00 6- 2 sysfs, kernfs: prepare mount path for kernfs # first bad commit: [4b93dc9b1c684d0587fe44d36bbfdf45bd3bea9d] sysfs, kernfs: prepare mount path for kernfs git bisect good df394fb56c64244b30b442e9e02de1a2d9c5a98b # 01:10 195+ 0 sysfs, kernfs: make super_blocks bind to different kernfs_roots git bisect bad 9a96b5740489ec8410be60b7d52504c76caca49e # 01:10 0- 10 Add linux-next specific files for 20131204 git bisect good dea4f48a0a301b23c65af8e4fe8ccf360c272fbf # 01:28 195+ 0 Merge branch 'leds-fixes-for-3.13' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds git bisect bad 9a96b5740489ec8410be60b7d52504c76caca49e # 01:28 0- 10 Add linux-next specific files for 20131204 --yliu