Ubuntu
linux package

kernel crash when doing `rm -rf /root`

Bug #1469579 reported by derek
8
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Invalid
Medium
Unassigned

Bug Description

to make a persistent /root, I'd usually like to rm -rf /root and make it a symlink to somewhere on the harddrive, when I run with the Ubuntu Studio 15.10 (Wily Werewolf) Daily Build, it just crashed the kernel, this crash didn't happen of my last visit ubuntu14.10

http://cdimages.ubuntu.com/ubuntustudio/dvd/current/ (current is 28-Jun-2015 as the time now)

then I can reproduce this within VM, with Ubuntu 15.10 daily build (current is 09-Jun-2015), from serial console I run strace \rm -rvf /root and see kernel panic messages:

root@ubuntu-studio:~# cd /
root@ubuntu-studio:/# strace \rm -rvf /root && echo true
execve("/bin/rm", ["rm", "-rvf", "/root"], [/* 19 vars */]) = 0
brk(0) = 0x2090000
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f91151e4000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=123268, ...}) = 0
mmap(NULL, 123268, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f91151c5000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0`\v\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1869392, ...}) = 0
mmap(NULL, 3972864, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f9114bf9000
mprotect(0x7f9114db9000, 2097152, PROT_NONE) = 0
mmap(0x7f9114fb9000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1c0000) = 0x7f9114fb9000
mmap(0x7f9114fbf000, 16128, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f9114fbf000
close(3) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f91151c4000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f91151c3000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f91151c2000
arch_prctl(ARCH_SET_FS, 0x7f91151c3700) = 0
mprotect(0x7f9114fb9000, 16384, PROT_READ) = 0
mprotect(0x60d000, 4096, PROT_READ) = 0
mprotect(0x7f91151e6000, 4096, PROT_READ) = 0
munmap(0x7f91151c5000, 123268) = 0
brk(0) = 0x2090000
brk(0x20b1000) = 0x20b1000
open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2919792, ...}) = 0
mmap(NULL, 2919792, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f9114930000
close(3) = 0
ioctl(0, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, {B9600 opost isig icanon echo ...}) = 0
lstat("/", {st_mode=S_IFDIR|0755, st_size=260, ...}) = 0
newfstatat(AT_FDCWD, "/root", {st_mode=S_IFDIR|0700, st_size=60, ...}, AT_SYMLINK_NOFOLLOW) = 0
openat(AT_FDCWD, "/root", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_DIRECTORY|O_NOFOLLOW) = 3
fstat(3, {st_mode=S_IFDIR|0700, st_size=60, ...}) = 0
fcntl(3, F_GETFL) = 0x38800 (flags O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_NOFOLLOW)
fcntl(3, F_SETFD, FD_CLOEXEC) = 0
getdents(3, /* 5 entries */, 32768) = 144
close(3) = 0
openat(AT_FDCWD, "/root", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_DIRECTORY|O_NOFOLLOW) = 3
fcntl(3, F_GETFD) = 0
fcntl(3, F_SETFD, FD_CLOEXEC) = 0
fstat(3, {st_mode=S_IFDIR|0700, st_size=60, ...}) = 0
fcntl(3, F_GETFL) = 0x38800 (flags O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_NOFOLLOW)
fcntl(3, F_SETFD, FD_CLOEXEC) = 0
fcntl(3, F_DUPFD, 3) = 4
fcntl(4, F_GETFD) = 0
fcntl(4, F_SETFD, FD_CLOEXEC) = 0
getdents(3, /* 5 entries */, 32768) = 144
getdents(3, /* 0 entries */, 32768) = 0
close(3) = 0
unlinkat(4, ".bashrc", 0) = 0
open("/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2570, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f91151e3000
read(3, "# Locale name alias data base.\n#"..., 1024) = 1024
read(3, " entries are case independent.\n\n"..., 1024) = 1024
read(3, "R\nko_KR\t\tko_KR.eucKR\nlithuanian "..., 1024) = 522
read(3, "", 1024) = 0
close(3) = 0
munmap(0x7f91151e3000, 4096) = 0
open("/usr/share/locale/en_US.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en_US/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/en/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en_US.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en_US.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en_US/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale-langpack/en/LC_MESSAGES/coreutils.mo", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=619, ...}) = 0
mmap(NULL, 619, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f91151e3000
close(3) = 0
open("/usr/lib/charset.alias", O_RDONLY|O_NOFOLLOW) = -1 ENOENT (No such file or directory)
fstat(1, {st_mode=S_IFCHR|0600, st_rdev=makedev(4, 64), ...}) = 0
ioctl(1, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, {B9600 opost isig icanon echo ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f91151e2000
write(1, "removed \342\200\230/root/.bashrc\342\200\231\n", 28removed ‘/root/.bashrc’
) = 28
unlinkat(4, ".profile", 0) = 0
write(1, "removed \342\200\230/root/.profile\342\200\231\n", 29removed ‘/root/.profile’
) = 29
newfstatat(4, ".cache", {st_mode=S_IFDIR|0700, st_size=60, ...}, AT_SYMLINK_NOFOLLOW) = 0
openat(4, ".cache", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_DIRECTORY|O_NOFOLLOW) = 3
fstat(3, {st_mode=S_IFDIR|0700, st_size=60, ...}) = 0
fcntl(3, F_GETFL) = 0x38800 (flags O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_NOFOLLOW)
fcntl(3, F_SETFD, FD_CLOEXEC) = 0
getdents(3, /* 3 entries */, 32768) = 88
close(3) = 0
openat(4, ".cache", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_DIRECTORY|O_NOFOLLOW) = 3
fcntl(3, F_GETFD) = 0
fcntl(3, F_SETFD, FD_CLOEXEC) = 0
fstat(3, {st_mode=S_IFDIR|0700, st_size=60, ...}) = 0
fcntl(3, F_GETFL) = 0x38800 (flags O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_NOFOLLOW)
fcntl(3, F_SETFD, FD_CLOEXEC) = 0
fcntl(3, F_DUPFD, 3) = 5
fcntl(5, F_GETFD) = 0
fcntl(5, F_SETFD, FD_CLOEXEC) = 0
getdents(3, /* 3 entries */, 32768) = 88
getdents(3, /* 0 entries */, 32768) = 0
close(3) = 0
unlinkat(5, "motd.legal-displayed", 0) = 0
write(1, "removed \342\200\230/root/.cache/motd.leg"..., 48removed ‘/root/.cache/motd.legal-displayed’
) = 48
close(5) = 0
unlinkat(4, ".cache", AT_REMOVEDIR) = 0
write(1, "removed directory: \342\200\230/root/.cac"..., 38removed directory: ‘/root/.cache’
) = 38
close(4) = 0
unlinkat(AT_FDCWD, "/root", AT_REMOVEDIR[ 77.975408] BUG: unable to handle kernel NULL pointer dereference at 0000000000000016
[ 77.976006] IP: [<ffffffff81219ba0>] __detach_mounts+0x40/0x90
[ 77.976006] PGD 127fa067 PUD 112cd067 PMD 0
[ 77.976006] Oops: 0000 [#1] PREEMPT SMP
[ 77.976006] Modules linked in: kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd dm_multipath scsi_dh serio_raw i2c_piix4 cfg80211 8250_fintek mac_hid cuse parport_pc ppdev lp parport autofs4 squashfs overlay nls_utf8 isofs dm_mirror dm_region_hash dm_log psmouse e1000 pata_acpi floppy
[ 77.976006] CPU: 0 PID: 2308 Comm: rm Not tainted 3.19.0-22-lowlatency #22-Ubuntu
[ 77.976006] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.8.1-20150604_211837-tipua 04/01/2014
[ 77.976006] task: ffff880006db09f0 ti: ffff880011310000 task.ti: ffff880011310000
[ 77.976006] RIP: 0010:[<ffffffff81219ba0>] [<ffffffff81219ba0>] __detach_mounts+0x40/0x90
[ 77.976006] RSP: 0018:ffff880011313e38 EFLAGS: 00010206
[ 77.976006] RAX: 0000000026842684 RBX: fffffffffffffffe RCX: 000000000000000c
[ 77.976006] RDX: 0000000000002684 RSI: ffffffffffffffff RDI: ffffffff81c0c4c4
[ 77.976006] RBP: ffff880011313e48 R08: 0000000000000000 R09: 0000000000000246
[ 77.976006] R10: ffffffff81198297 R11: ffff8800051d4c00 R12: ffff88003305f718
[ 77.976006] R13: ffff880053323cd8 R14: 00000000ffffff9c R15: 0000000000000000
[ 77.976006] FS: 00007f91151c3700(0000) GS:ffff880055e00000(0000) knlGS:0000000000000000
[ 77.976006] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 77.976006] CR2: 0000000000000016 CR3: 000000001240f000 CR4: 00000000001407f0
[ 77.976006] Stack:
[ 77.976006] ffff880011313e48 ffff88003305f6c0 ffff880011313e78 ffffffff81202a7f
[ 77.976006] ffff880011313e68 ffff88001f427000 0000000000000000 00000000020910c0
[ 77.976006] ffff880011313f68 ffffffff812083f3 ffff88003305f6c0 ffff880011313ea8
[ 77.976006] Call Trace:
[ 77.976006] [<ffffffff81202a7f>] vfs_rmdir+0x12f/0x140
[ 77.976006] [<ffffffff812083f3>] do_rmdir+0x203/0x220
[ 77.976006] [<ffffffff810257f7>] ? syscall_trace_enter_phase2+0x107/0x240
[ 77.976006] [<ffffffff81025a23>] ? syscall_trace_leave+0x83/0x170
[ 77.976006] [<ffffffff812097f5>] SyS_unlinkat+0x25/0x40
[ 77.976006] [<ffffffff817cf984>] tracesys_phase2+0xd8/0xdd
[ 77.976006] Code: 83 ec 08 e8 93 3b 5b 00 48 89 df e8 eb d2 ff ff 48 85 c0 48 89 c3 74 55 48 c7 c7 c4 c4 c0 81 e8 77 58 5b 00 83 05 20 29 9f 00 01 <48> 8b 53 18 48 85 d2 74 1e 0f 1f 80 00 00 00 00 48 8d ba 10 ff
[ 77.976006] RIP [<ffffffff81219ba0>] __detach_mounts+0x40/0x90
[ 77.976006] RSP <ffff880011313e38>
[ 77.976006] CR2: 0000000000000016
[ 77.976006] ---[ end trace ba33e07ed00b256d ]---
[ 77.976006] note: rm[2308] exited with preempt_count 1

telnet> send brk # here I tried to send a break for SysRq, but the kernel is not responding at the moment,

[ 104.042006] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [rm:2308]
[ 104.042006] Modules linked in: kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd dm_multipath scsi_dh serio_raw i2c_piix4 cfg80211 8250_fintek mac_hid cuse parport_pc ppdev lp parport autofs4 squashfs overlay nls_utf8 isofs dm_mirror dm_region_hash dm_log psmouse e1000 pata_acpi floppy
[ 104.042006] CPU: 0 PID: 2308 Comm: rm Tainted: G D 3.19.0-22-lowlatency #22-Ubuntu
[ 104.042006] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.8.1-20150604_211837-tipua 04/01/2014
[ 104.042006] task: ffff880006db09f0 ti: ffff880011310000 task.ti: ffff880011310000
[ 104.042006] RIP: 0010:[<ffffffff8105d156>] [<ffffffff8105d156>] native_safe_halt+0x6/0x10
[ 104.042006] RSP: 0018:ffff880011313910 EFLAGS: 00000206
[ 104.042006] RAX: 0000000000002685 RBX: 0100000000000000 RCX: 0000000000075898
[ 104.042006] RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff8800560ed000
[ 104.042006] RBP: ffff880011313910 R08: 0000000000000004 R09: 0000000000000246
[ 104.042006] R10: ffffffff8119f621 R11: 0000000000000000 R12: ffff8800560f1780
[ 104.042006] R13: ffffea000044b3c0 R14: ffffffff811d7255 R15: ffff880011313918
[ 104.042006] FS: 0000000000000000(0000) GS:ffff880055e00000(0000) knlGS:0000000000000000
[ 104.042006] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 104.042006] CR2: 0000000000000016 CR3: 0000000001c13000 CR4: 00000000001407f0
[ 104.042006] Stack:
[ 104.042006] ffff880011313960 ffffffff8105cb8c ffffffff811d76d6 00002686113139b8
[ 104.042006] ffff8800051d0a80 ffff88004f5c7280 0000000040000010 ffff8800127c6a98
[ 104.042006] ffff8800051a5a80 ffff88004f5c72a0 ffff8800113139b8 ffffffff8105be51
[ 104.042006] Call Trace:
[ 104.042006] [<ffffffff8105cb8c>] kvm_lock_spinning+0xbc/0x220
[ 104.042006] [<ffffffff811d76d6>] ? kmem_cache_free+0x206/0x240
[ 104.042006] [<ffffffff8105be51>] __raw_callee_save_kvm_lock_spinning+0x11/0x20
[ 104.042006] [<ffffffff8119f621>] ? kzfree+0x31/0x40
[ 104.042006] [<ffffffff817cf48b>] ? _raw_spin_lock+0x7b/0x80
[ 104.042006] [<ffffffff81218694>] mntput_no_expire+0x44/0x160
[ 104.042006] [<ffffffff812187d4>] mntput+0x24/0x40
[ 104.042006] [<ffffffff811f8a72>] __fput+0x182/0x240
[ 104.042006] [<ffffffff811f8b7e>] ____fput+0xe/0x10
[ 104.042006] [<ffffffff81094317>] task_work_run+0xb7/0xf0
[ 104.042006] [<ffffffff81079c5d>] do_exit+0x35d/0xa70
[ 104.042006] [<ffffffff810ce625>] ? kmsg_dump+0xc5/0xd0
[ 104.042006] [<ffffffff81019ba8>] oops_end+0xa8/0x120
[ 104.042006] [<ffffffff81063b2d>] no_context+0x11d/0x390
[ 104.042006] [<ffffffff81211149>] ? __d_alloc+0x29/0x190
[ 104.042006] [<ffffffff8108022d>] ? ns_capable+0x2d/0x60
[ 104.042006] [<ffffffff81063e1d>] __bad_area_nosemaphore+0x7d/0x210
[ 104.042006] [<ffffffff81211149>] ? __d_alloc+0x29/0x190
[ 104.042006] [<ffffffff81063fc3>] bad_area_nosemaphore+0x13/0x20
[ 104.042006] [<ffffffff810642be>] __do_page_fault+0xbe/0x5e0
[ 104.042006] [<ffffffff810da87d>] ? call_rcu+0x1d/0x20
[ 104.042006] [<ffffffff811940e1>] ? shmem_destroy_inode+0x31/0x50
[ 104.042006] [<ffffffff81064895>] trace_do_page_fault+0x45/0x140
[ 104.042006] [<ffffffff8105c4de>] do_async_page_fault+0x1e/0xd0
[ 104.042006] [<ffffffff817d1948>] async_page_fault+0x28/0x30
[ 104.042006] [<ffffffff81198297>] ? shmem_evict_inode+0x57/0x140
[ 104.042006] [<ffffffff81219ba0>] ? __detach_mounts+0x40/0x90
[ 104.042006] [<ffffffff81219b99>] ? __detach_mounts+0x39/0x90
[ 104.042006] [<ffffffff81202a7f>] vfs_rmdir+0x12f/0x140
[ 104.042006] [<ffffffff812083f3>] do_rmdir+0x203/0x220
[ 104.042006] [<ffffffff810257f7>] ? syscall_trace_enter_phase2+0x107/0x240
[ 104.042006] [<ffffffff81025a23>] ? syscall_trace_leave+0x83/0x170
[ 104.042006] [<ffffffff812097f5>] SyS_unlinkat+0x25/0x40
[ 104.042006] [<ffffffff817cf984>] tracesys_phase2+0xd8/0xdd
[ 104.042006] Code: 00 00 00 00 00 55 48 89 e5 fa 5d c3 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 fb 5d c3 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 fb f4 <5d> c3 0f 1f 84 00 00 00 00 00 55 48 89 e5 f4 5d c3 66 0f 1f 84
QEMU 2.3.0 monitor - type 'help' for more information
(qemu) quit
Connection closed by foreign host.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: linux-image-3.19.0-22-lowlatency 3.19.0-22.22
ProcVersionSignature: Ubuntu 3.19.0-22.22-lowlatency 3.19.8-ckt1
Uname: Linux 3.19.0-22-lowlatency x86_64
NonfreeKernelModules: wl
ApportVersion: 2.17.3-0ubuntu4
Architecture: amd64
CasperVersion: 1.361
CurrentDesktop: XFCE
Date: Sun Jun 28 18:38:29 2015
LiveMediaBuild: Ubuntu-Studio 15.10 "Wily Werewolf" - Alpha amd64 (20150623)
MachineType: Apple Inc. MacBookPro11,2
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/studio/casper/vmlinuz file=/cdrom/preseed/ubuntustudio.seed boot=casper iso-scan/filename=/studio/wily-dvd-amd64.iso quiet splash username=username acpi_osi=Linux acpi=force acpi_enforce_resources=lax i915.enable_rc6=1 i915.enable_fbc=1 i915.lvds_downclock=1 i915.semaphores=1 pcie_aspm=force crashkernel=auto ---
RelatedPackageVersions:
 linux-restricted-modules-3.19.0-22-lowlatency N/A
 linux-backports-modules-3.19.0-22-lowlatency N/A
 linux-firmware 1.144
SourcePackage: linux
StagingDrivers: r8188eu
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/07/2015
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBP112.88Z.0138.B14.1501071031
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-3CBD00234E554E41
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookPro11,2
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-3CBD00234E554E41
dmi.modalias: dmi:bvnAppleInc.:bvrMBP112.88Z.0138.B14.1501071031:bd01/07/2015:svnAppleInc.:pnMacBookPro11,2:pvr1.0:rvnAppleInc.:rnMac-3CBD00234E554E41:rvrMacBookPro11,2:cvnAppleInc.:ct10:cvrMac-3CBD00234E554E41:
dmi.product.name: MacBookPro11,2
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.

Revision history for this message
derek (denc716) wrote :
Revision history for this message
Brad Figg (brad-figg) wrote : Status changed to Confirmed

This change was made by a bot.

Changed in linux (Ubuntu):
status: New → Confirmed
Revision history for this message
derek (denc716) wrote :

this looks like a bug of overlay fs, when /root only exists in underlying rofs and not exist in upper writable layer, what will happen if remove the dir from the combined mount?
please let me know what else I can do to narrow down this kernel bug.

Revision history for this message
Joseph Salisbury (jsalisbury) wrote :

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.1 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.1-unstable/

Changed in linux (Ubuntu):
importance: Undecided → Medium
status: Confirmed → Incomplete
Revision history for this message
derek (denc716) wrote :
Download full text (7.9 KiB)

Tested upstream v4.1.1 doesn't have this problem; kernel-fixed-upstream

http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.1.1-unstable/
[ ] linux-image-4.1.1-040101-lowlatency_4.1.1-040101.201506291635_amd64.deb 29-Jun-2015 20:58 53M

root@ubuntu-studio:~# uname -a
Linux ubuntu-studio 4.1.1-040101-lowlatency #201506291635 SMP PREEMPT Mon Jun 29 20:45:44 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
root@ubuntu-studio:~#
root@ubuntu-studio:~#
root@ubuntu-studio:~# strace \rm -rvf /root && echo "removed /root"

execve("/bin/rm", ["rm", "-rvf", "/root"], [/* 19 vars */]) = 0
brk(0) = 0x1494000
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f47669e3000
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=123268, ...}) = 0
mmap(NULL, 123268, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f47669c4000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
open("/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0`\v\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1869392, ...}) = 0
mmap(NULL, 3972864, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f47663f8000
mprotect(0x7f47665b8000, 2097152, PROT_NONE) = 0
mmap(0x7f47667b8000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1c0000) = 0x7f47667b8000
mmap(0x7f47667be000, 16128, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f47667be000
close(3) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f47669c3000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f47669c2000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f47669c1000
arch_prctl(ARCH_SET_FS, 0x7f47669c2700) = 0
mprotect(0x7f47667b8000, 16384, PROT_READ) = 0
mprotect(0x60d000, 4096, PROT_READ) = 0
mprotect(0x7f47669e5000, 4096, PROT_READ) = 0
munmap(0x7f47669c4000, 123268) = 0
brk(0) = 0x1494000
brk(0x14b5000) = 0x14b5000
open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2919792, ...}) = 0
mmap(NULL, 2919792, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f476612f000
close(3) = 0
ioctl(0, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, {B9600 opost isig icanon echo ...}) = 0
lstat("/", {st_mode=S_IFDIR|0755, st_size=240, ...}) = 0
newfstatat(AT_FDCWD, "/root", {st_mode=S_IFDIR|0700, st_size=46, ...}, AT_SYMLINK_NOFOLLOW) = 0
openat(AT_FDCWD, "/root", O_RDONLY|O_NOCTTY|O_NONBLOCK|O_DIRECTORY|O_NOFOLLOW) = 3
fstat(3, {st_mode=S_IFDIR|0700, st_size=46, ...}) = 0
fcntl(3, F_GETFL) = 0x38800 (flags O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_NOFOLLOW)
fcntl(3, F_SETFD, FD_CLOEXEC) = 0
getdents(...

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tags: added: kernel-fixed-upstream
derek (denc716)
Changed in linux (Ubuntu):
status: Incomplete → Opinion
status: Opinion → Confirmed
Revision history for this message
penalvch (penalvch) wrote :

derek, the next step is to fully reverse commit bisect from kernel 3.19 to 4.1 in order to identify the last bad commit, followed immediately by the first good one. Once this commit has been identified, then it may be reviewed as a candidate for backporting into your release. Could you please do this following https://wiki.ubuntu.com/Kernel/KernelBisection#How_do_I_reverse_bisect_the_upstream_kernel.3F ?

Please note, finding adjacent kernel versions is not fully commit bisecting.

Thank you for your understanding.

Helpful bug reporting tips:
https://wiki.ubuntu.com/ReportingBugs

tags: added: kernel-fixed-upstream-4.1 needs-reverse-bisect
Changed in linux (Ubuntu):
status: Confirmed → Incomplete
Revision history for this message
derek (denc716) wrote :

I have the Ubuntu Mate Daily Live 20150716 image is good, doesn't have this problem anymore.
http://cdimages.ubuntu.com/ubuntu-mate/daily-live/20150716/

root@ubuntu-mate:~# uname -a
Linux ubuntu-mate 4.0.0-4-generic #6-Ubuntu SMP Tue Jun 30 20:49:28 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

Revision history for this message
penalvch (penalvch) wrote :

derek, this bug report is being closed due to your last comment https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1469579/comments/7 regarding this being fixed with an update. For future reference you can manage the status of your own bugs by clicking on the current status in the yellow line and then choosing a new status in the revealed drop down box. You can learn more about bug statuses at https://wiki.ubuntu.com/Bugs/Status. Thank you again for taking the time to report this bug and helping to make Ubuntu better. Please submit any future bugs you may find.

Changed in linux (Ubuntu):
status: Incomplete → Invalid
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