Hi Al, I got the below dmesg and the first bad commit is git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git commit 3d54406d3c64c0e7e092f8299c460ebe0aea9795 Author: Al Viro AuthorDate: Thu Mar 20 21:10:51 2014 -0400 Commit: Al Viro CommitDate: Thu Mar 20 21:10:51 2014 -0400 switch mnt_hash to hlist Cc: stable@vger.kernel.org Signed-off-by: Al Viro +----------------------------------------------------------+------------+------------+------------+ | | 6a92faa1d6 | 3d54406d3c | 3d54406d3c | +----------------------------------------------------------+------------+------------+------------+ | boot_successes | 30 | 0 | 0 | | boot_failures | 50 | 19 | 19 | | page_allocation_failure:order:,mode | 46 | | | | BUG:kernel_test_hang | 10 | | | | backtrace:vfs_write | 46 | | | | backtrace:SyS_write | 46 | | | | WARNING:CPU:PID:at_kernel/workqueue.c:process_one_work() | 1 | | | | backtrace:warn_slowpath_null | 1 | | | | BUG:soft_lockup-CPU_stuck_for_s | 3 | | | | RIP:_raw_spin_unlock_irqrestore | 3 | | | | Kernel_panic-not_syncing:softlockup:hung_tasks | 3 | | | | backtrace:schedule_timeout | 1 | | | | backtrace:smpboot_thread_fn | 1 | | | | BUG:Dentry_i=c,n=/still_in_use()unmount_of_tmpfs_tmpfs | 0 | 1 | 1 | | kernel_BUG_at_fs/dcache.c | 0 | 19 | 19 | | invalid_opcode:SMP | 0 | 19 | 19 | | RIP:umount_collect | 0 | 19 | 19 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 19 | 19 | | backtrace:do_umount | 0 | 19 | 19 | | backtrace:SyS_umount | 0 | 19 | 19 | | BUG:Dentry_i=d0a,n=/still_in_use()unmount_of_tmpfs_tmpfs | 0 | 1 | 1 | | BUG:Dentry_i=d25,n=/still_in_use()unmount_of_tmpfs_tmpfs | 0 | 1 | 1 | | BUG:Dentry_i=e,n=/still_in_use()unmount_of_tmpfs_tmpfs | 0 | 1 | 1 | | BUG:Dentry_i=f20,n=/still_in_use()unmount_of_tmpfs_tmpfs | 0 | 1 | 1 | | BUG:Dentry_i=,n=/still_in_use()unmount_of_tmpfs_tmpfs | 0 | 5 | 5 | | BUG:Dentry_i=fa6,n=/still_in_use()unmount_of_tmpfs_tmpfs | 0 | 1 | 1 | | BUG:Dentry_i=cfb,n=/still_in_use()unmount_of_tmpfs_tmpfs | 0 | 1 | 1 | | BUG:Dentry_i=d53,n=/still_in_use()unmount_of_tmpfs_tmpfs | 0 | 1 | 1 | | BUG:Dentry_i=d51,n=/still_in_use()unmount_of_tmpfs_tmpfs | 0 | 1 | 1 | | BUG:Dentry_i=f,n=/still_in_use()unmount_of_tmpfs_tmpfs | 0 | 2 | 2 | | BUG:Dentry_i=a,n=/still_in_use()unmount_of_tmpfs_tmpfs | 0 | 1 | 1 | | BUG:Dentry_i=d1,n=/still_in_use()unmount_of_tmpfs_tmpfs | 0 | 1 | 1 | | BUG:Dentry_i=ffc,n=/still_in_use()unmount_of_tmpfs_tmpfs | 0 | 1 | 1 | +----------------------------------------------------------+------------+------------+------------+ [ 1.533068] tsc: Refined TSC clocksource calibration: 2693.428 MHz Kernel tests: Boot OK! [ 2.096054] input: ImExPS/2 Generic Explorer Mouse as /devices/platform/i8042/serio1/input/input3 [ 67.795181] BUG: Dentry ffff88000e6559c0{i=2010,n=/} still in use (2) [unmount of tmpfs tmpfs] [ 67.797804] ------------[ cut here ]------------ git bisect start 3d54406d3c64c0e7e092f8299c460ebe0aea9795 887843961c4b4681ee993c36d4997bf4b4aa8253 -- git bisect good 6c310c7e4f544762057b4fce4f7b492b70f15a23 # 11:00 20+ 2 keep shadowed vfsmounts together git bisect good 8cefb970aa3b94377554d5083611768ff257ce19 # 11:46 20+ 12 resizable namespace.c hashes git bisect good 6a92faa1d647d78ec54506d783c5a7ce503b4843 # 12:37 20+ 7 smarter propagate_mnt() # first bad commit: [3d54406d3c64c0e7e092f8299c460ebe0aea9795] switch mnt_hash to hlist git bisect good 6a92faa1d647d78ec54506d783c5a7ce503b4843 # 15:39 60+ 50 smarter propagate_mnt() git bisect bad 3d54406d3c64c0e7e092f8299c460ebe0aea9795 # 15:39 0- 19 switch mnt_hash to hlist git bisect good 08edb33c4e1b810011f21d7705811b7b9a0535f0 # 15:47 60+ 2 Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux git bisect good 06ed26d1de59ce7cbbe68378b7e470be169750e5 # 16:16 60+ 0 Add linux-next specific files for 20140321 Thanks, Fengguang