BUG: MAX_LOCKDEP_CHAINS too low!

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 4b0e041c Linux 4.19.35
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1486f013200000
kernel config: https://syzkaller.appspot.com/x/.config?x=bb1bcac868b1655e
dashboard link: https://syzkaller.appspot.com/bug?extid=9cd3ace500d75a5e1018
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+9cd3ac...@syzkaller.appspotmail.com

BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 1 PID: 22277 Comm: syz-executor.0 Not tainted 4.19.35 #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x172/0x1f0 lib/dump_stack.c:113
add_chain_cache kernel/locking/lockdep.c:2254 [inline]
lookup_chain_cache_add kernel/locking/lockdep.c:2366 [inline]
validate_chain kernel/locking/lockdep.c:2386 [inline]
__lock_acquire.cold+0x153/0x4a1 kernel/locking/lockdep.c:3411
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3903
seqcount_lockdep_reader_access include/linux/seqlock.h:81 [inline]
read_seqcount_begin include/linux/seqlock.h:164 [inline]
ktime_get_coarse_real_ts64+0xaf/0x2b0 kernel/time/timekeeping.c:2193
current_kernel_time64 include/linux/timekeeping.h:277 [inline]
current_time+0x6f/0x140 fs/inode.c:2149
ext4_xattr_set_handle+0x74a/0x1010 fs/ext4/xattr.c:2427
ext4_xattr_set+0x1e5/0x370 fs/ext4/xattr.c:2507
ext4_xattr_trusted_set+0x36/0x40 fs/ext4/xattr_trusted.c:37
__vfs_setxattr+0x121/0x190 fs/xattr.c:149
__vfs_setxattr_noperm+0x11c/0x410 fs/xattr.c:180
vfs_setxattr+0xda/0x100 fs/xattr.c:223
ovl_do_setxattr fs/overlayfs/overlayfs.h:154 [inline]
ovl_check_setxattr+0xf1/0x130 fs/overlayfs/util.c:580
ovl_set_impure+0xb0/0x110 fs/overlayfs/util.c:602
ovl_do_copy_up fs/overlayfs/copy_up.c:648 [inline]
ovl_copy_up_one+0x5db/0xe50 fs/overlayfs/copy_up.c:811
ovl_copy_up_flags+0x15a/0x1e0 fs/overlayfs/copy_up.c:856
ovl_copy_up+0x18/0x1c fs/overlayfs/copy_up.c:903
ovl_rename+0x262/0x1870 fs/overlayfs/dir.c:1086
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
vfs_rename+0x803/0x1a70 fs/namei.c:4476
do_renameat2+0xb0f/0xc40 fs/namei.c:4626
__do_sys_renameat fs/namei.c:4667 [inline]
__se_sys_renameat fs/namei.c:4664 [inline]
__x64_sys_renameat+0x9a/0x100 fs/namei.c:4664
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458c29
Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fd8805c0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000108
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000458c29
RDX: 0000000000000003 RSI: 00000000200001c0 RDI: 0000000000000003
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000200007c0 R11: 0000000000000246 R12: 00007fd8805c16d4
R13: 00000000004c5bc0 R14: 00000000004da1c0 R15: 00000000ffffffff
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=770
sclass=netlink_route_socket pig=22359 comm=syz-executor.2
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=770
sclass=netlink_route_socket pig=22395 comm=syz-executor.2
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
protocol 88fb is buggy, dev hsr_slave_0
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=770
sclass=netlink_route_socket pig=22395 comm=syz-executor.2
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop3' (00000000a10158f7): kobject_uevent_env
kobject: 'loop3' (00000000a10158f7): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
F2FS-fs (loop3): Magic Mismatch, valid(0xf2f52010) - read(0x0)
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
F2FS-fs (loop3): Can't find valid F2FS filesystem in 1th superblock
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
F2FS-fs (loop3): Magic Mismatch, valid(0xf2f52010) - read(0x0)
F2FS-fs (loop3): Can't find valid F2FS filesystem in 2th superblock
F2FS-fs (loop3): Magic Mismatch, valid(0xf2f52010) - read(0x0)
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=770
sclass=netlink_route_socket pig=22426 comm=syz-executor.2
F2FS-fs (loop3): Can't find valid F2FS filesystem in 1th superblock
F2FS-fs (loop3): Magic Mismatch, valid(0xf2f52010) - read(0x0)
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=770
sclass=netlink_route_socket pig=22432 comm=syz-executor.2
F2FS-fs (loop3): Can't find valid F2FS filesystem in 2th superblock
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=770
sclass=netlink_route_socket pig=22430 comm=syz-executor.0
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=770
sclass=netlink_route_socket pig=22430 comm=syz-executor.0
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop3' (00000000a10158f7): kobject_uevent_env
kobject: 'loop3' (00000000a10158f7): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'loop3' (00000000a10158f7): kobject_uevent_env
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=770
sclass=netlink_route_socket pig=22446 comm=syz-executor.0
kobject: 'loop3' (00000000a10158f7): fill_kobj_path: path
= '/devices/virtual/block/loop3'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=770
sclass=netlink_route_socket pig=22491 comm=syz-executor.2
kobject: 'loop3' (00000000a10158f7): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop3' (00000000a10158f7): fill_kobj_path: path
= '/devices/virtual/block/loop3'
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=770
sclass=netlink_route_socket pig=22558 comm=syz-executor.2
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
net_ratelimit: 16 callbacks suppressed
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
protocol 88fb is buggy, dev hsr_slave_1
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
audit: type=1804 audit(2000000876.706:1072): pid=22792 uid=0
auid=4294967295 ses=4294967295
subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr
cause=open_writers comm="syz-executor.3" name="dsp" dev="sda1" ino=16681
res=1
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
audit: type=1804 audit(2000000876.745:1073): pid=22792 uid=0
auid=4294967295 ses=4294967295
subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr
cause=open_writers comm="syz-executor.3" name="dsp" dev="sda1" ino=16681
res=1
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
protocol 88fb is buggy, dev hsr_slave_0
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
protocol 88fb is buggy, dev hsr_slave_1
protocol 88fb is buggy, dev hsr_slave_1
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
net_ratelimit: 17 callbacks suppressed
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
kobject: 'loop2' (0000000065d621e2): kobject_uevent_env
kobject: 'loop2' (0000000065d621e2): fill_kobj_path: path
= '/devices/virtual/block/loop2'
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'
audit: type=1800 audit(2000000882.279:1074): pid=23390 uid=0
auid=4294967295 ses=4294967295
subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=collect_data
cause=failed(directio) comm="syz-executor.3" name="rfkill" dev="sda1"
ino=17876 res=0
audit: type=1800 audit(2000000882.309:1075): pid=23390 uid=0
auid=4294967295 ses=4294967295
subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=collect_data
cause=failed(directio) comm="syz-executor.3" name="rfkill" dev="sda1"
ino=17876 res=0
protocol 88fb is buggy, dev hsr_slave_0
protocol 88fb is buggy, dev hsr_slave_1
protocol 88fb is buggy, dev hsr_slave_1
kobject: 'loop1' (0000000024c91ac0): kobject_uevent_env
kobject: 'loop1' (0000000024c91ac0): fill_kobj_path: path
= '/devices/virtual/block/loop1'


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