gfs2: invalid mount option: lockp”oto=lock_
gfs2: can't parse mount arguments
gfs2: invalid mount option: lockp”oto=lock_
gfs2: can't parse mount arguments
======================================================
WARNING: possible circular locking dependency detected
4.19.114-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.2/9699 is trying to acquire lock:
00000000b639013a (&ovl_i_mutex_dir_key[depth]#2){++++}, at: inode_lock_shared include/linux/fs.h:758 [inline]
00000000b639013a (&ovl_i_mutex_dir_key[depth]#2){++++}, at: lookup_slow+0x43/0x70 fs/namei.c:1688

but task is already holding lock:
00000000a7cbbc0c (&sig->cred_guard_mutex){+.+.}, at: __do_sys_perf_event_open+0x7b5/0x2830 kernel/events/core.c:10601

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&sig->cred_guard_mutex){+.+.}:
       do_io_accounting+0x1da/0x7b0 fs/proc/base.c:2738
       proc_single_show+0xeb/0x170 fs/proc/base.c:755
       seq_read+0x4b9/0x10f0 fs/seq_file.c:229
       do_loop_readv_writev fs/read_write.c:701 [inline]
       do_loop_readv_writev fs/read_write.c:688 [inline]
       do_iter_read+0x46b/0x640 fs/read_write.c:925
       vfs_readv+0xf0/0x160 fs/read_write.c:987
       kernel_readv fs/splice.c:362 [inline]
       default_file_splice_read+0x478/0x970 fs/splice.c:417
       do_splice_to+0x10e/0x160 fs/splice.c:881
       splice_direct_to_actor+0x2b9/0x8d0 fs/splice.c:959
       do_splice_direct+0x1a8/0x270 fs/splice.c:1068
       do_sendfile+0x549/0xc10 fs/read_write.c:1447
       __do_sys_sendfile64 fs/read_write.c:1508 [inline]
       __se_sys_sendfile64 fs/read_write.c:1494 [inline]
       __x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1494
       do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #2 (&p->lock){+.+.}:
       seq_read+0x6b/0x10f0 fs/seq_file.c:161
       do_loop_readv_writev fs/read_write.c:701 [inline]
       do_loop_readv_writev fs/read_write.c:688 [inline]
       do_iter_read+0x46b/0x640 fs/read_write.c:925
       vfs_readv+0xf0/0x160 fs/read_write.c:987
       kernel_readv fs/splice.c:362 [inline]
       default_file_splice_read+0x478/0x970 fs/splice.c:417
       do_splice_to+0x10e/0x160 fs/splice.c:881
       splice_direct_to_actor+0x2b9/0x8d0 fs/splice.c:959
       do_splice_direct+0x1a8/0x270 fs/splice.c:1068
       do_sendfile+0x549/0xc10 fs/read_write.c:1447
       __do_sys_sendfile64 fs/read_write.c:1508 [inline]
       __se_sys_sendfile64 fs/read_write.c:1494 [inline]
       __x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1494
       do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #1 (sb_writers#3){.+.+}:
       sb_start_write include/linux/fs.h:1579 [inline]
       mnt_want_write+0x3a/0xb0 fs/namespace.c:360
       ovl_do_remove+0xf8/0xd70 fs/overlayfs/dir.c:843
       vfs_rmdir fs/namei.c:3882 [inline]
       vfs_rmdir+0x194/0x460 fs/namei.c:3861
       do_rmdir+0x371/0x3e0 fs/namei.c:3943
       do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

-> #0 (&ovl_i_mutex_dir_key[depth]#2){++++}:
       down_read+0x37/0xb0 kernel/locking/rwsem.c:24
       inode_lock_shared include/linux/fs.h:758 [inline]
       lookup_slow+0x43/0x70 fs/namei.c:1688
       walk_component+0x70a/0x1ee0 fs/namei.c:1811
       lookup_last fs/namei.c:2274 [inline]
       path_lookupat.isra.0+0x1f5/0x8d0 fs/namei.c:2319
       filename_lookup+0x1b0/0x410 fs/namei.c:2349
       create_local_trace_uprobe+0x82/0x490 kernel/trace/trace_uprobe.c:1356
       perf_uprobe_init+0x128/0x200 kernel/trace/trace_event_perf.c:317
       perf_uprobe_event_init+0xf8/0x190 kernel/events/core.c:8572
       perf_try_init_event+0x124/0x2e0 kernel/events/core.c:9845
       perf_init_event kernel/events/core.c:9876 [inline]
       perf_event_alloc.part.0+0x1e5f/0x2f90 kernel/events/core.c:10150
       perf_event_alloc kernel/events/core.c:10520 [inline]
       __do_sys_perf_event_open+0x902/0x2830 kernel/events/core.c:10621
       do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
       entry_SYSCALL_64_after_hwframe+0x49/0xbe

other info that might help us debug this:

Chain exists of:
  &ovl_i_mutex_dir_key[depth]#2 --> &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(&ovl_i_mutex_dir_key[depth]#2);

 *** DEADLOCK ***

2 locks held by syz-executor.2/9699:
 #0: 00000000a7cbbc0c (&sig->cred_guard_mutex){+.+.}, at: __do_sys_perf_event_open+0x7b5/0x2830 kernel/events/core.c:10601
 #1: 000000001eef0690 (&pmus_srcu){....}, at: perf_event_alloc.part.0+0xda7/0x2f90 kernel/events/core.c:10146

stack backtrace:
CPU: 1 PID: 9699 Comm: syz-executor.2 Not tainted 4.19.114-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x188/0x20d lib/dump_stack.c:118
 print_circular_bug.isra.0.cold+0x1c4/0x282 kernel/locking/lockdep.c:1221
 check_prev_add kernel/locking/lockdep.c:1861 [inline]
 check_prevs_add kernel/locking/lockdep.c:1974 [inline]
 validate_chain kernel/locking/lockdep.c:2415 [inline]
 __lock_acquire+0x2e19/0x49c0 kernel/locking/lockdep.c:3411
 lock_acquire+0x170/0x400 kernel/locking/lockdep.c:3903
 down_read+0x37/0xb0 kernel/locking/rwsem.c:24
 inode_lock_shared include/linux/fs.h:758 [inline]
 lookup_slow+0x43/0x70 fs/namei.c:1688
 walk_component+0x70a/0x1ee0 fs/namei.c:1811
 lookup_last fs/namei.c:2274 [inline]
 path_lookupat.isra.0+0x1f5/0x8d0 fs/namei.c:2319
 filename_lookup+0x1b0/0x410 fs/namei.c:2349
 create_local_trace_uprobe+0x82/0x490 kernel/trace/trace_uprobe.c:1356
 perf_uprobe_init+0x128/0x200 kernel/trace/trace_event_perf.c:317
 perf_uprobe_event_init+0xf8/0x190 kernel/events/core.c:8572
 perf_try_init_event+0x124/0x2e0 kernel/events/core.c:9845
 perf_init_event kernel/events/core.c:9876 [inline]
 perf_event_alloc.part.0+0x1e5f/0x2f90 kernel/events/core.c:10150
 perf_event_alloc kernel/events/core.c:10520 [inline]
 __do_sys_perf_event_open+0x902/0x2830 kernel/events/core.c:10621
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c889
Code: ad b6 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 b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fd20a6d6c78 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007fd20a6d76d4 RCX: 000000000045c889
RDX: fffeffffffffffff RSI: 0000000000000000 RDI: 0000000020000480
RBP: 000000000076bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000816 R14: 00000000004cad21 R15: 000000000076bfac
audit: type=1804 audit(1586636624.604:28): pid=9854 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir038524697/syzkaller.oX3ATj/37/bus" dev="sda1" ino=15927 res=1
audit: type=1804 audit(1586636625.114:29): pid=9880 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir038524697/syzkaller.oX3ATj/38/bus" dev="sda1" ino=15933 res=1
audit: type=1804 audit(1586636625.344:30): pid=9901 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir038524697/syzkaller.oX3ATj/39/bus" dev="sda1" ino=15929 res=1
audit: type=1804 audit(1586636625.494:31): pid=9913 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir038524697/syzkaller.oX3ATj/40/bus" dev="sda1" ino=15918 res=1
audit: type=1804 audit(1586636625.684:32): pid=9929 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir038524697/syzkaller.oX3ATj/41/bus" dev="sda1" ino=15936 res=1
audit: type=1804 audit(1586636625.824:33): pid=9940 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir038524697/syzkaller.oX3ATj/42/bus" dev="sda1" ino=15933 res=1
audit: type=1804 audit(1586636625.944:34): pid=9953 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir038524697/syzkaller.oX3ATj/43/bus" dev="sda1" ino=15936 res=1
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
audit: type=1804 audit(1586636626.464:35): pid=10000 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir038524697/syzkaller.oX3ATj/47/bus" dev="sda1" ino=15936 res=1
audit: type=1804 audit(1586636626.654:36): pid=10014 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir038524697/syzkaller.oX3ATj/48/bus" dev="sda1" ino=15910 res=1
overlayfs: overlapping lowerdir path
audit: type=1804 audit(1586636627.274:37): pid=10056 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir038524697/syzkaller.oX3ATj/52/bus" dev="sda1" ino=15953 res=1
overlayfs: overlapping lowerdir path
overlayfs: overlapping lowerdir path
overlayfs: overlapping lowerdir path
overlayfs: overlapping lowerdir path
overlayfs: overlapping lowerdir path
overlayfs: overlapping lowerdir path
overlayfs: overlapping lowerdir path
overlayfs: overlapping lowerdir path
overlayfs: overlapping lowerdir path
overlayfs: overlapping lowerdir path
overlayfs: overlapping lowerdir path
overlayfs: overlapping lowerdir path
overlayfs: overlapping lowerdir path
overlayfs: overlapping lowerdir path
kauditd_printk_skb: 8 callbacks suppressed
audit: type=1804 audit(1586636629.994:46): pid=10221 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir527860026/syzkaller.UTliFl/89/bus" dev="sda1" ino=15910 res=1
overlayfs: missing 'lowerdir'
audit: type=1804 audit(1586636630.194:47): pid=10237 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir527860026/syzkaller.UTliFl/90/bus" dev="sda1" ino=15710 res=1
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
overlayfs: missing 'lowerdir'
audit: type=1804 audit(1586636630.404:48): pid=10254 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir527860026/syzkaller.UTliFl/91/bus" dev="sda1" ino=15982 res=1
overlayfs: missing 'lowerdir'
overlayfs: overlapping lowerdir path
overlayfs: missing 'lowerdir'
audit: type=1804 audit(1586636630.644:49): pid=10276 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir527860026/syzkaller.UTliFl/92/bus" dev="sda1" ino=15980 res=1