EXT4-fs (loop4): mounting ext2 file system using the ext4 subsystem
EXT4-fs (loop4): invalid inodes per group: 16384
======================================================
WARNING: possible circular locking dependency detected
4.14.94+ #12 Not tainted
------------------------------------------------------
syz-executor2/26248 is trying to acquire lock:
(&pipe->mutex/1){+.+.}, at: [] __pipe_lock fs/pipe.c:88 [inline]
(&pipe->mutex/1){+.+.}, at: [] fifo_open+0x156/0x9b0 fs/pipe.c:921
but task is already holding lock:
(&sig->cred_guard_mutex){+.+.}, at: [] prepare_bprm_creds+0x51/0x110 fs/exec.c:1389
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&sig->cred_guard_mutex){+.+.}:
-> #1 (&p->lock){+.+.}:
-> #0 (&pipe->mutex/1){+.+.}:
other info that might help us debug this:
Chain exists of:
&pipe->mutex/1 --> &p->lock --> &sig->cred_guard_mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&sig->cred_guard_mutex);
lock(&p->lock);
lock(&sig->cred_guard_mutex);
lock(&pipe->mutex/1);
*** DEADLOCK ***
1 lock held by syz-executor2/26248:
#0: (&sig->cred_guard_mutex){+.+.}, at: [] prepare_bprm_creds+0x51/0x110 fs/exec.c:1389
stack backtrace:
CPU: 1 PID: 26248 Comm: syz-executor2 Not tainted 4.14.94+ #12
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0xb9/0x10e lib/dump_stack.c:53
print_circular_bug.isra.0.cold+0x2dc/0x425 kernel/locking/lockdep.c:1258
EXT4-fs (loop4): mounting ext2 file system using the ext4 subsystem
EXT4-fs (loop4): invalid inodes per group: 16384
loop5: p1 p2 p3 p4 < >
loop5: partition table partially beyond EOD, truncated
loop5: p1 start 1 is beyond EOD, truncated
loop5: p2 start 101 is beyond EOD, truncated
loop5: p3 start 201 is beyond EOD, truncated
loop5: p4 start 301 is beyond EOD, truncated
EXT4-fs (loop4): mounting ext2 file system using the ext4 subsystem
EXT4-fs (loop4): invalid inodes per group: 16384
loop5: p1 p2 p3 p4 < >
loop3: p1 p2 p3 p4 < >
EXT4-fs (loop4): mounting ext2 file system using the ext4 subsystem
loop5: partition table partially beyond EOD,
loop3: partition table partially beyond EOD,
EXT4-fs (loop4): invalid inodes per group: 16384
truncated
truncated
loop3: p1 start 1 is beyond EOD, truncated
loop3: p2 start 101 is beyond EOD, truncated
loop3: p3 start 201 is beyond EOD, truncated
loop5: p1 start 1 is beyond EOD, truncated
loop5: p2 start 101 is beyond EOD, truncated
loop1: p1 p2 p3 p4 < >
loop1: partition table partially beyond EOD, truncated
loop3: p4 start 301 is beyond EOD, truncated
loop1: p1 start 1 is beyond EOD, truncated
loop5: p3 start 201 is beyond EOD, truncated
loop1: p2 start 101 is beyond EOD, truncated
loop5: p4 start 301 is beyond EOD, truncated
loop1: p3 start 201 is beyond EOD, truncated
loop1: p4 start 301 is beyond EOD, truncated
loop3: p1 p2 p3 p4 < >
loop3: partition table partially beyond EOD, truncated
loop3: p1 start 1 is beyond EOD, truncated
loop3: p2 start 101 is beyond EOD, truncated
loop3: p3 start 201 is beyond EOD, truncated
loop3: p4 start 301 is beyond EOD, truncated
loop5: p1 p2 p3 p4 < >
loop5: partition table partially beyond EOD, truncated
loop5: p1 start 1 is beyond EOD, truncated
loop5: p2 start 101 is beyond EOD, truncated
loop5: p3 start 201 is beyond EOD, truncated
loop5: p4 start 301 is beyond EOD, truncated
loop1: p1 p2 p3 p4 < >
loop1: partition table partially beyond EOD, truncated
loop1: p1 start 1 is beyond EOD, truncated
loop1: p2 start 101 is beyond EOD, truncated
loop1: p3 start 201 is beyond EOD, truncated
loop1: p4 start 301 is beyond EOD, truncated
loop3: p1 p2 p3 p4 < >
loop3: partition table partially beyond EOD, truncated
loop3: p1 start 1 is beyond EOD, truncated
loop3: p2 start 101 is beyond EOD, truncated
loop3: p3 start 201 is beyond EOD, truncated
loop3: p4 start 301 is beyond EOD, truncated
loop5: p1 p2 p3 p4 < >
loop5: partition table partially beyond EOD, truncated
loop5: p1 start 1 is beyond EOD, truncated
loop5: p2 start 101 is beyond EOD, truncated
loop5: p3 start 201 is beyond EOD, truncated
loop5: p4 start 301 is beyond EOD, truncated
loop1: p1 p2 p3 p4 < >
loop1: partition table partially beyond EOD, truncated
loop1: p1 start 1 is beyond EOD, truncated
loop1: p2 start 101 is beyond EOD, truncated
loop1: p3 start 201 is beyond EOD, truncated
loop1: p4 start 301 is beyond EOD, truncated
loop3: p1 p2 p3 p4 < >
loop3: partition table partially beyond EOD, truncated
loop3: p1 start 1 is beyond EOD, truncated
loop3: p2 start 101 is beyond EOD, truncated
loop3: p3 start 201 is beyond EOD, truncated
loop3: p4 start 301 is beyond EOD, truncated
loop5: p1 p2 p3 p4 < >
loop5: partition table partially beyond EOD, truncated
loop5: p1 start 1 is beyond EOD, truncated
loop5: p2 start 101 is beyond EOD, truncated
loop5: p3 start 201 is beyond EOD, truncated
loop5: p4 start 301 is beyond EOD, truncated
loop1: p1 p2 p3 p4 < >
loop1: partition table partially beyond EOD, truncated
loop1: p1 start 1 is beyond EOD, truncated
loop1: p2 start 101 is beyond EOD, truncated
loop1: p3 start 201 is beyond EOD, truncated
loop1: p4 start 301 is beyond EOD, truncated
loop3: p1 p2 p3 p4 < >
loop3: partition table partially beyond EOD, truncated
loop3: p1 start 1 is beyond EOD, truncated
loop3: p2 start 101 is beyond EOD, truncated
loop3: p3 start 201 is beyond EOD, truncated
loop3: p4 start 301 is beyond EOD, truncated
loop5: p1 p2 p3 p4 < >
loop5: partition table partially beyond EOD, truncated
loop5: p1 start 1 is beyond EOD, truncated
loop5: p2 start 101 is beyond EOD, truncated
loop5: p3 start 201 is beyond EOD, truncated
loop5: p4 start 301 is beyond EOD, truncated
loop1: p1 p2 p3 p4 < >
loop1: partition table partially beyond EOD, truncated
loop1: p1 start 1 is beyond EOD, truncated
loop1: p2 start 101 is beyond EOD, truncated
loop1: p3 start 201 is beyond EOD, truncated
loop1: p4 start 301 is beyond EOD, truncated
loop3: p1 p2 p3 p4 < >
loop3: partition table partially beyond EOD, truncated
loop3: p1 start 1 is beyond EOD, truncated
loop3: p2 start 101 is beyond EOD, truncated
loop3: p3 start 201 is beyond EOD, truncated
loop3: p4 start 301 is beyond EOD, truncated
loop5: p1 p2 p3 p4 < >
loop5: partition table partially beyond EOD, truncated
loop5: p1 start 1 is beyond EOD, truncated
loop5: p2 start 101 is beyond EOD, truncated
loop5: p3 start 201 is beyond EOD, truncated
loop5: p4 start 301 is beyond EOD, truncated
loop1: p1 p2 p3 p4 < >
loop1: partition table partially beyond EOD, truncated
loop1: p1 start 1 is beyond EOD, truncated
loop1: p2 start 101 is beyond EOD, truncated
loop1: p3 start 201 is beyond EOD, truncated
loop1: p4 start 301 is beyond EOD, truncated
loop3: p1 p2 p3 p4 < >
loop3: partition table partially beyond EOD, truncated
loop3: p1 start 1 is beyond EOD, truncated
loop3: p2 start 101 is beyond EOD, truncated
loop3: p3 start 201 is beyond EOD, truncated
loop3: p4 start 301 is beyond EOD, truncated
loop5: p1 p2 p3 p4 < >
loop5: partition table partially beyond EOD, truncated
loop5: p1 start 1 is beyond EOD, truncated
loop5: p2 start 101 is beyond EOD, truncated
loop5: p3 start 201 is beyond EOD, truncated
loop5: p4 start 301 is beyond EOD, truncated
loop1: p1 p2 p3 p4 < >
loop1: partition table partially beyond EOD, truncated
loop1: p1 start 1 is beyond EOD, truncated
loop1: p2 start 101 is beyond EOD, truncated
loop1: p3 start 201 is beyond EOD, truncated
loop1: p4 start 301 is beyond EOD, truncated
loop3: p1 p2 p3 p4 < >
loop3: partition table partially beyond EOD, truncated
loop3: p1 start 1 is beyond EOD, truncated
loop3: p2 start 101 is beyond EOD, truncated
loop3: p3 start 201 is beyond EOD, truncated
loop3: p4 start 301 is beyond EOD, truncated
loop5: p1 p2 p3 p4 < >
loop5: partition table partially beyond EOD, truncated
loop5: p1 start 1 is beyond EOD, truncated
loop5: p2 start 101 is beyond EOD, truncated
loop5: p3 start 201 is beyond EOD, truncated
loop5: p4 start 301 is beyond EOD, truncated
loop1: p1 p2 p3 p4 < >
loop1: partition table partially beyond EOD, truncated
loop1: p1 start 1 is beyond EOD, truncated
loop1: p2 start 101 is beyond EOD, truncated
loop1: p3 start 201 is beyond EOD, truncated
loop1: p4 start 301 is beyond EOD, truncated
loop3: p1 p2 p3 p4 < >
loop3: partition table partially beyond EOD, truncated
loop3: p1 start 1 is beyond EOD, truncated
loop3: p2 start 101 is beyond EOD, truncated
loop3: p3 start 201 is beyond EOD, truncated
loop3: p4 start 301 is beyond EOD, truncated
loop5: p1 p2 p3 p4 < >
loop5: partition table partially beyond EOD, truncated
loop5: p1 start 1 is beyond EOD, truncated
loop5: p2 start 101 is beyond EOD, truncated
loop5: p3 start 201 is beyond EOD, truncated
loop5: p4 start 301 is beyond EOD, truncated