Bluetooth: hci5 command 0x0409 tx timeout netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. ====================================================== WARNING: possible circular locking dependency detected 4.14.198-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/24665 is trying to acquire lock: (&oi->lock){+.+.}, at: [] ovl_copy_up_start+0x40/0xe0 fs/overlayfs/util.c:318 but task is already holding lock: (sb_writers#8){.+.+}, at: [] sb_start_write include/linux/fs.h:1549 [inline] (sb_writers#8){.+.+}, at: [] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (sb_writers#8){.+.+}: 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+0x19a/0x2e0 fs/super.c:1363 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 -> #1 (&ovl_i_mutex_dir_key[depth]){++++}: down_read+0x36/0x80 kernel/locking/rwsem.c:24 inode_lock_shared include/linux/fs.h:729 [inline] lookup_slow+0x129/0x400 fs/namei.c:1674 lookup_one_len_unlocked+0x3a0/0x410 fs/namei.c:2595 ovl_lower_positive+0x184/0x345 fs/overlayfs/namei.c:783 ovl_rename+0x47c/0xe90 fs/overlayfs/dir.c:968 vfs_rename+0x560/0x1820 fs/namei.c:4496 SYSC_renameat2 fs/namei.c:4644 [inline] SyS_renameat2+0x95b/0xad0 fs/namei.c:4533 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #0 (&oi->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 ovl_copy_up_start+0x40/0xe0 fs/overlayfs/util.c:318 ovl_copy_up_one+0x219/0x8d0 fs/overlayfs/copy_up.c:630 ovl_copy_up_flags+0xd5/0x120 fs/overlayfs/copy_up.c:685 ovl_xattr_set+0x189/0x270 fs/overlayfs/inode.c:225 ovl_posix_acl_xattr_set+0x2b7/0x830 fs/overlayfs/super.c:762 __vfs_setxattr+0xdc/0x130 fs/xattr.c:150 __vfs_setxattr_noperm+0xfd/0x3d0 fs/xattr.c:181 __vfs_setxattr_locked+0x14d/0x250 fs/xattr.c:239 vfs_setxattr+0xcf/0x230 fs/xattr.c:256 setxattr+0x1a9/0x300 fs/xattr.c:523 path_setxattr+0x118/0x130 fs/xattr.c:542 SYSC_lsetxattr fs/xattr.c:564 [inline] SyS_lsetxattr+0x33/0x40 fs/xattr.c:560 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: &oi->lock --> &ovl_i_mutex_dir_key[depth] --> sb_writers#8 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sb_writers#8); lock(&ovl_i_mutex_dir_key[depth]); lock(sb_writers#8); lock(&oi->lock); *** DEADLOCK *** 3 locks held by syz-executor.0/24665: #0: (sb_writers#22){.+.+}, at: [] sb_start_write include/linux/fs.h:1549 [inline] #0: (sb_writers#22){.+.+}, at: [] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 #1: (&ovl_i_mutex_key[depth]#2){+.+.}, at: [] inode_lock include/linux/fs.h:719 [inline] #1: (&ovl_i_mutex_key[depth]#2){+.+.}, at: [] vfs_setxattr+0xb1/0x230 fs/xattr.c:255 #2: (sb_writers#8){.+.+}, at: [] sb_start_write include/linux/fs.h:1549 [inline] #2: (sb_writers#8){.+.+}, at: [] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 stack backtrace: CPU: 1 PID: 24665 Comm: syz-executor.0 Not tainted 4.14.198-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+0x1b2/0x283 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 ovl_copy_up_start+0x40/0xe0 fs/overlayfs/util.c:318 ovl_copy_up_one+0x219/0x8d0 fs/overlayfs/copy_up.c:630 ovl_copy_up_flags+0xd5/0x120 fs/overlayfs/copy_up.c:685 ovl_xattr_set+0x189/0x270 fs/overlayfs/inode.c:225 ovl_posix_acl_xattr_set+0x2b7/0x830 fs/overlayfs/super.c:762 __vfs_setxattr+0xdc/0x130 fs/xattr.c:150 __vfs_setxattr_noperm+0xfd/0x3d0 fs/xattr.c:181 __vfs_setxattr_locked+0x14d/0x250 fs/xattr.c:239 vfs_setxattr+0xcf/0x230 fs/xattr.c:256 setxattr+0x1a9/0x300 fs/xattr.c:523 path_setxattr+0x118/0x130 fs/xattr.c:542 SYSC_lsetxattr fs/xattr.c:564 [inline] SyS_lsetxattr+0x33/0x40 fs/xattr.c:560 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45de29 RSP: 002b:00007fef4ba4dc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd RAX: ffffffffffffffda RBX: 0000000000020c40 RCX: 000000000045de29 RDX: 0000000020000440 RSI: 0000000020000040 RDI: 0000000020000100 RBP: 000000000118c018 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000004 R11: 0000000000000246 R12: 000000000118bfd4 R13: 00007ffcfef9231f R14: 00007fef4ba4e9c0 R15: 000000000118bfd4 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop2): __ext4_new_inode:930: comm syz-executor.2: reserved inode found cleared - inode=1 EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop2): __ext4_new_inode:930: comm syz-executor.2: reserved inode found cleared - inode=1 EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop2): __ext4_new_inode:930: comm syz-executor.2: reserved inode found cleared - inode=1 EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop2): __ext4_new_inode:930: comm syz-executor.2: reserved inode found cleared - inode=1 Bluetooth: hci5 command 0x041b tx timeout EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop2): __ext4_new_inode:930: comm syz-executor.2: reserved inode found cleared - inode=1 EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop2): __ext4_new_inode:930: comm syz-executor.2: reserved inode found cleared - inode=1 EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop2): __ext4_new_inode:930: comm syz-executor.2: reserved inode found cleared - inode=1 EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop2): __ext4_new_inode:930: comm syz-executor.2: reserved inode found cleared - inode=1 EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop2): __ext4_new_inode:930: comm syz-executor.2: reserved inode found cleared - inode=1 EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop2): __ext4_new_inode:930: comm syz-executor.2: reserved inode found cleared - inode=1 EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop2): __ext4_new_inode:930: comm syz-executor.2: reserved inode found cleared - inode=1 EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop2): __ext4_new_inode:930: comm syz-executor.2: reserved inode found cleared - inode=1 EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop2): __ext4_new_inode:930: comm syz-executor.2: reserved inode found cleared - inode=1 EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop2): __ext4_new_inode:930: comm syz-executor.2: reserved inode found cleared - inode=1 Bluetooth: hci5 command 0x040f tx timeout EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop2): __ext4_new_inode:930: comm syz-executor.2: reserved inode found cleared - inode=1 EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop2): __ext4_new_inode:930: comm syz-executor.2: reserved inode found cleared - inode=1 nla_parse: 52 callbacks suppressed netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 20 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. EXT4-fs error (device loop2): __ext4_new_inode:930: comm syz-executor.2: reserved inode found cleared - inode=1 netlink: 20 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop2): __ext4_new_inode:930: comm syz-executor.2: reserved inode found cleared - inode=9 EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. EXT4-fs error (device loop2): __ext4_new_inode:930: comm syz-executor.2: reserved inode found cleared - inode=9 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. EXT4-fs (loop2): mounted filesystem without journal. Opts: ,errors=continue EXT4-fs error (device loop2): __ext4_new_inode:930: comm syz-executor.2: reserved inode found cleared - inode=9 EXT4-fs (loop2): VFS: Can't find ext4 filesystem Bluetooth: hci5 command 0x0419 tx timeout EXT4-fs (loop2): VFS: Can't find ext4 filesystem print_req_error: I/O error, dev loop2, sector 0 Buffer I/O error on dev loop2, logical block 0, async page read print_req_error: I/O error, dev loop2, sector 4 Buffer I/O error on dev loop2, logical block 2, async page read print_req_error: I/O error, dev loop2, sector 6 Buffer I/O error on dev loop2, logical block 3, async page read EXT4-fs (loop2): VFS: Can't find ext4 filesystem EXT4-fs (loop2): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock EXT4-fs (loop2): group descriptors corrupted! EXT4-fs (loop2): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock EXT4-fs (loop2): group descriptors corrupted! EXT4-fs (loop2): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock EXT4-fs (loop2): group descriptors corrupted! EXT4-fs (loop2): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock EXT4-fs (loop2): group descriptors corrupted! EXT4-fs (loop2): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock EXT4-fs (loop2): group descriptors corrupted! nla_parse: 40 callbacks suppressed netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'. EXT4-fs (loop2): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. EXT4-fs (loop2): group descriptors corrupted! netlink: 24 bytes leftover after parsing attributes in process `syz-executor.1'.