Hi Joern, I got this dmesg when running xfstests 206 in kvm: [12016.870431] FAT-fs (loop0): utf8 is not a recommended IO charset for FAT filesystems, filesystem will be case sensitive! [12016.960017] FAT-fs (loop0): bogus number of reserved sectors [12017.018620] FAT-fs (loop0): Can't find a valid FAT filesystem [12017.109282] VFS: could not find a valid V7 on loop0. [12017.216596] LogFS: Start mount 0 [12017.314045] LogFS: Start unmounting [12017.373512] BUG: unable to handle kernel NULL pointer dereference at (null) [12017.373512] IP: [<ffffffff810da6ec>] ftrace_raw_event_lock_acquire+0x46/0xe9 [12017.373512] PGD 7b9f067 PUD 6f15067 PMD 0 [12017.373512] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC [12017.373512] CPU 0 [12017.373512] Modules linked in: [12017.373512] [12017.373512] Pid: 2898, comm: mount Not tainted 3.5.0-rc2+ #12 Bochs Bochs [12017.373512] RIP: 0010:[<ffffffff810da6ec>] [<ffffffff810da6ec>] ftrace_raw_event_lock_acquire+0x46/0xe9 [12017.373512] RSP: 0018:ffff88000ab99ac8 EFLAGS: 00010046 [12017.373512] RAX: 0000000000000000 RBX: ffff880006b44ee8 RCX: ffffffffffffffff [12017.373512] RDX: 0000000000000000 RSI: 000000000000015f RDI: 0000000000000000 [12017.373512] RBP: ffff88000ab99b28 R08: 0000000000000000 R09: 0000000000000002 [12017.373512] R10: ffffffff82f1462f R11: ffff88000ab99bb8 R12: ffffffff84047910 [12017.373512] R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000002 [12017.373512] FS: 00007f82ecc417e0(0000) GS:ffff880017200000(0000) knlGS:0000000000000000 [12017.373512] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [12017.373512] CR2: 0000000000000000 CR3: 0000000016778000 CR4: 00000000000006f0 [12017.373512] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [12017.373512] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [12017.373512] Process mount (pid: 2898, threadinfo ffff88000ab98000, task ffff880006a01400) [12017.373512] Stack: [12017.373512] 0000000000000001 7fffffffffffffff ffff880000000000 0000000000000092 [12017.373512] ffff88000ab99fd8 0000000000000001 ffff880006a01400 0000000000000000 [12017.373512] ffff88000a1df888 ffffffff81394df0 0000000000000002 0000000000000000 [12017.373512] Call Trace: [12017.373512] [<ffffffff81394df0>] ? logfs_get_wblocks+0x3a/0x4a [12017.373512] [<ffffffff810ddebd>] lock_acquire+0x92/0x103 [12017.373512] [<ffffffff81394df0>] ? logfs_get_wblocks+0x3a/0x4a [12017.373512] [<ffffffff82f14732>] ? wait_for_completion+0x1d/0x1f [12017.373512] [<ffffffff81394df0>] ? logfs_get_wblocks+0x3a/0x4a [12017.373512] [<ffffffff82f134e3>] __mutex_lock_common+0x58/0x383 [12017.373512] [<ffffffff81394df0>] ? logfs_get_wblocks+0x3a/0x4a [12017.373512] [<ffffffff82f1391d>] mutex_lock_nested+0x40/0x45 [12017.373512] [<ffffffff81394df0>] logfs_get_wblocks+0x3a/0x4a [12017.373512] [<ffffffff81391e62>] logfs_sync_fs+0x1a/0x37 [12017.373512] [<ffffffff81391e48>] ? logfs_cleanup_gc+0x98/0x98 [12017.373512] [<ffffffff811aade0>] __sync_filesystem+0x6b/0x7f [12017.373512] [<ffffffff811aae44>] sync_filesystem+0x38/0x4d [12017.373512] [<ffffffff81398291>] logfs_kill_sb+0x2c/0xe1 [12017.373512] [<ffffffff81187933>] deactivate_locked_super+0x26/0x57 [12017.373512] [<ffffffff81398f7d>] logfs_get_sb_device+0x13b/0x147 [12017.373512] [<ffffffff81399094>] logfs_mount+0x10b/0x11b [12017.373512] [<ffffffff81188aa7>] mount_fs+0x69/0x156 [12017.373512] [<ffffffff81154536>] ? __alloc_percpu+0x10/0x12 [12017.373512] [<ffffffff8119dbec>] vfs_kern_mount+0x65/0xd2 [12017.373512] [<ffffffff8119e092>] do_kern_mount+0x4d/0xdf [12017.373512] [<ffffffff8119f7c8>] do_mount+0x1c4/0x216 [12017.373512] [<ffffffff8119fad9>] sys_mount+0x88/0xc2 [12017.373512] [<ffffffff82f1cf90>] tracesys+0xdd/0xe2 [12017.373512] Code: 89 45 b0 e8 07 f7 ff ff 48 8b 7b 18 48 89 45 b8 48 83 c9 ff 65 48 8b 04 25 20 ca 00 00 44 8b b8 44 e0 ff ff 31 c0 41 8b 74 24 48 <f2> ae 48 8d 7d c8 f7 d1 45 89 f8 89 4d b4 48 63 d1 48 8b 4d b8 [12017.373512] RIP [<ffffffff810da6ec>] ftrace_raw_event_lock_acquire+0x46/0xe9 [12017.373512] RSP <ffff88000ab99ac8> [12017.373512] CR2: 0000000000000000 Thanks, Fengguang -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
