BFS-fs: bfs_fill_super(): No BFS filesystem on loop4 (magic=75121c59)
======================================================
WARNING: possible circular locking dependency detected
4.14.222-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.2/27988 is trying to acquire lock:
(&p->lock){+.+.}, at: [<ffffffff818e5eea>] seq_read+0xba/0x1120 fs/seq_file.c:165
but task is already holding lock:
(sb_writers#3){.+.+}, at: [<ffffffff81867c1f>] file_start_write include/linux/fs.h:2712 [inline]
(sb_writers#3){.+.+}, at: [<ffffffff81867c1f>] do_sendfile+0x84f/0xb30 fs/read_write.c:1440
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (sb_writers#3){.+.+}:
percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline]
percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
__sb_start_write+0x64/0x260 fs/super.c:1342
sb_start_write include/linux/fs.h:1549 [inline]
mnt_want_write+0x3a/0xb0 fs/namespace.c:386
ovl_create_object+0x75/0x1d0 fs/overlayfs/dir.c:538
lookup_open+0x77a/0x1750 fs/namei.c:3241
do_last fs/namei.c:3334 [inline]
path_openat+0xe08/0x2970 fs/namei.c:3569
do_filp_open+0x179/0x3c0 fs/namei.c:3603
do_sys_open+0x296/0x410 fs/open.c:1081
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
-> #2 (&ovl_i_mutex_dir_key[depth]){++++}:
down_read+0x36/0x80 kernel/locking/rwsem.c:24
inode_lock_shared include/linux/fs.h:729 [inline]
do_last fs/namei.c:3333 [inline]
path_openat+0x149b/0x2970 fs/namei.c:3569
do_filp_open+0x179/0x3c0 fs/namei.c:3603
do_open_execat+0xd3/0x450 fs/exec.c:849
do_execveat_common+0x711/0x1f30 fs/exec.c:1755
do_execve fs/exec.c:1860 [inline]
SYSC_execve fs/exec.c:1941 [inline]
SyS_execve+0x3b/0x50 fs/exec.c:1936
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
-> #1 (&sig->cred_guard_mutex){+.+.}:
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
lock_trace fs/proc/base.c:407 [inline]
proc_pid_personality+0x48/0x160 fs/proc/base.c:2913
proc_single_show+0xe7/0x150 fs/proc/base.c:761
seq_read+0x4cf/0x1120 fs/seq_file.c:237
__vfs_read+0xe4/0x620 fs/read_write.c:411
vfs_read+0x139/0x340 fs/read_write.c:447
SYSC_read fs/read_write.c:574 [inline]
SyS_read+0xf2/0x210 fs/read_write.c:567
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
-> #0 (&p->lock){+.+.}:
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
seq_read+0xba/0x1120 fs/seq_file.c:165
proc_reg_read+0xee/0x1a0 fs/proc/inode.c:217
do_loop_readv_writev fs/read_write.c:695 [inline]
do_loop_readv_writev fs/read_write.c:682 [inline]
do_iter_read+0x3eb/0x5b0 fs/read_write.c:919
vfs_readv+0xc8/0x120 fs/read_write.c:981
kernel_readv fs/splice.c:361 [inline]
default_file_splice_read+0x418/0x910 fs/splice.c:416
do_splice_to+0xfb/0x140 fs/splice.c:880
splice_direct_to_actor+0x207/0x730 fs/splice.c:952
do_splice_direct+0x164/0x210 fs/splice.c:1061
do_sendfile+0x47f/0xb30 fs/read_write.c:1441
SYSC_sendfile64 fs/read_write.c:1502 [inline]
SyS_sendfile64+0xff/0x110 fs/read_write.c:1488
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
other info that might help us debug this:
Chain exists of:
&p->lock --> &ovl_i_mutex_dir_key[depth] --> sb_writers#3
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(sb_writers#3);
lock(&ovl_i_mutex_dir_key[depth]);
lock(sb_writers#3);
lock(&p->lock);
*** DEADLOCK ***
1 lock held by syz-executor.2/27988:
#0: (sb_writers#3){.+.+}, at: [<ffffffff81867c1f>] file_start_write include/linux/fs.h:2712 [inline]
#0: (sb_writers#3){.+.+}, at: [<ffffffff81867c1f>] do_sendfile+0x84f/0xb30 fs/read_write.c:1440
stack backtrace:
CPU: 1 PID: 27988 Comm: syz-executor.2 Not tainted 4.14.222-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x1b2/0x281 lib/dump_stack.c:58
print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258
check_prev_add kernel/locking/lockdep.c:1905 [inline]
check_prevs_add kernel/locking/lockdep.c:2022 [inline]
validate_chain kernel/locking/lockdep.c:2464 [inline]
__lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491
lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
__mutex_lock_common kernel/locking/mutex.c:756 [inline]
__mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893
seq_read+0xba/0x1120 fs/seq_file.c:165
proc_reg_read+0xee/0x1a0 fs/proc/inode.c:217
do_loop_readv_writev fs/read_write.c:695 [inline]
do_loop_readv_writev fs/read_write.c:682 [inline]
do_iter_read+0x3eb/0x5b0 fs/read_write.c:919
vfs_readv+0xc8/0x120 fs/read_write.c:981
kernel_readv fs/splice.c:361 [inline]
default_file_splice_read+0x418/0x910 fs/splice.c:416
do_splice_to+0xfb/0x140 fs/splice.c:880
splice_direct_to_actor+0x207/0x730 fs/splice.c:952
do_splice_direct+0x164/0x210 fs/splice.c:1061
do_sendfile+0x47f/0xb30 fs/read_write.c:1441
SYSC_sendfile64 fs/read_write.c:1502 [inline]
SyS_sendfile64+0xff/0x110 fs/read_write.c:1488
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x465ef9
RSP: 002b:00007fb109e1e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465ef9
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 00000000004bcd1c R08: 0000000000000000 R09: 0000000000000000
R10: 4000000000010046 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007ffcfa93879f R14: 00007fb109e1e300 R15: 0000000000022000
Unknown ioctl 1074275332
gfs2: not a GFS2 filesystem
Unknown ioctl 1074275332
BFS-fs: bfs_fill_super(): No BFS filesystem on loop4 (magic=75121c59)
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
EXT4-fs (loop1): VFS: Can't find ext4 filesystem
print_req_error: 87 callbacks suppressed
print_req_error: I/O error, dev loop2, sector 0
print_req_error: I/O error, dev loop2, sector 0
buffer_io_error: 78 callbacks suppressed
Buffer I/O error on dev loop2p2, logical block 0, async page read
print_req_error: I/O error, dev loop2, sector 0
Buffer I/O error on dev loop2p2, logical block 0, async page read
print_req_error: I/O error, dev loop2, sector 0
Buffer I/O error on dev loop2p2, logical block 0, async page read
print_req_error: I/O error, dev loop2, sector 0
Buffer I/O error on dev loop2p2, logical block 0, async page read
print_req_error: I/O error, dev loop2, sector 0
Buffer I/O error on dev loop2p2, logical block 0, async page read
print_req_error: I/O error, dev loop2, sector 0
Buffer I/O error on dev loop2p2, logical block 0, async page read
print_req_error: I/O error, dev loop2, sector 0
Buffer I/O error on dev loop2p2, logical block 0, async page read
print_req_error: I/O error, dev loop2, sector 0
Buffer I/O error on dev loop2p2, logical block 0, async page read
print_req_error: I/O error, dev loop2, sector 0
Buffer I/O error on dev loop2p2, logical block 0, async page read
IPVS: ftp: loaded support on port[0] = 21
Buffer I/O error on dev loop2p2, logical block 0, async page read
overlayfs: fs on './file0' does not support file handles, falling back to index=off.
tmpfs: No value for mount option 'u#��X200000000000000060928'
kauditd_printk_skb: 4 callbacks suppressed
audit: type=1800 audit(1614296479.719:136): pid=28329 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.0" name="file0" dev="sda1" ino=16898 res=0
overlayfs: fs on '.' does not support file handles, falling back to index=off.
overlayfs: filesystem on './bus' not supported as upperdir
overlayfs: 'file0' not a directory
tmpfs: No value for mount option 'u#��X200000000000000060928'
device lo entered promiscuous mode
Y�4��`Ҙ: renamed from lo
EXT4-fs error (device loop5): ext4_orphan_get:1266: comm syz-executor.5: bad orphan inode 17
hpfs: bad mount options.
ext4_test_bit(bit=16, block=4) = 0
EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue
EXT4-fs error (device loop5): ext4_orphan_get:1266: comm syz-executor.5: bad orphan inode 17
ext4_test_bit(bit=16, block=4) = 0
EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue
hpfs: bad mount options.
EXT4-fs error (device loop5): ext4_orphan_get:1266: comm syz-executor.5: bad orphan inode 17
ext4_test_bit(bit=16, block=4) = 0
EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue
hpfs: bad mount options.
EXT4-fs error (device loop5): ext4_orphan_get:1266: comm syz-executor.5: bad orphan inode 17
ext4_test_bit(bit=16, block=4) = 0
EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue
device lo entered promiscuous mode
hpfs: bad mount options.
Y�4��`Ҙ: renamed from lo