ubi0: scanning is finished REISERFS (device loop1): Using r5 hash to sort names REISERFS (device loop1): Created .reiserfs_priv - reserved for xattr storage. ====================================================== ubi0: attached mtd0 (name "mtdram test device", size 0 MiB) WARNING: possible circular locking dependency detected 4.14.302-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.1/12160 is trying to acquire lock: ubi0: PEB size: 4096 bytes (4 KiB), LEB size: 3968 bytes (&journal->j_mutex){+.+.}, at: [] reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:816 [inline] (&journal->j_mutex){+.+.}, at: [] lock_journal fs/reiserfs/journal.c:537 [inline] (&journal->j_mutex){+.+.}, at: [] do_journal_begin_r+0x26b/0xde0 fs/reiserfs/journal.c:3054 but task is already holding lock: (sb_writers#23){.+.+}, at: [] sb_start_write include/linux/fs.h:1551 [inline] (sb_writers#23){.+.+}, at: [] mnt_want_write_file+0xfd/0x3b0 fs/namespace.c:497 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (sb_writers#23){.+.+}: 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:1551 [inline] mnt_want_write_file+0xfd/0x3b0 fs/namespace.c:497 reiserfs_ioctl+0x18e/0x8b0 fs/reiserfs/ioctl.c:110 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 ubi0: min./max. I/O unit sizes: 1/64, sub-page size 1 -> #1 (&sbi->lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 reiserfs_write_lock_nested+0x59/0xd0 fs/reiserfs/lock.c:78 ubi0: VID header offset: 64 (aligned 64), data offset: 128 reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:817 [inline] lock_journal fs/reiserfs/journal.c:537 [inline] do_journal_begin_r+0x276/0xde0 fs/reiserfs/journal.c:3054 journal_begin+0x162/0x3d0 fs/reiserfs/journal.c:3262 reiserfs_fill_super+0x18f4/0x2990 fs/reiserfs/super.c:2117 mount_bdev+0x2b3/0x360 fs/super.c:1134 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2572 [inline] do_mount+0xe65/0x2a30 fs/namespace.c:2905 SYSC_mount fs/namespace.c:3121 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3098 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 -> #0 (&journal->j_mutex){+.+.}: 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 reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:816 [inline] lock_journal fs/reiserfs/journal.c:537 [inline] do_journal_begin_r+0x26b/0xde0 fs/reiserfs/journal.c:3054 journal_begin+0x162/0x3d0 fs/reiserfs/journal.c:3262 reiserfs_dirty_inode+0xd9/0x200 fs/reiserfs/super.c:716 __mark_inode_dirty+0x11e/0xf40 fs/fs-writeback.c:2134 mark_inode_dirty include/linux/fs.h:2026 [inline] reiserfs_ioctl+0x6f6/0x8b0 fs/reiserfs/ioctl.c:118 ubi0: good PEBs: 32, bad PEBs: 0, corrupted PEBs: 0 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 ubi0: user volume: 0, internal volumes: 1, max. volumes count: 23 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 other info that might help us debug this: Chain exists of: &journal->j_mutex --> &sbi->lock --> sb_writers#23 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sb_writers#23); lock(&sbi->lock); lock(sb_writers#23); lock(&journal->j_mutex); *** DEADLOCK *** 1 lock held by syz-executor.1/12160: #0: (sb_writers#23){.+.+}, at: [] sb_start_write include/linux/fs.h:1551 [inline] #0: (sb_writers#23){.+.+}, at: [] mnt_want_write_file+0xfd/0x3b0 fs/namespace.c:497 stack backtrace: CPU: 1 PID: 12160 Comm: syz-executor.1 Not tainted 4.14.302-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 ubi0: max/mean erase counter: 1/1, WL threshold: 4096, image sequence number: 3435016007 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 ubi0: available PEBs: 28, total reserved PEBs: 4, PEBs reserved for bad PEB handling: 0 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 ubi0: background thread "ubi_bgt0d" started, PID 12223 ubi0: detaching mtd0 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 ubi0: mtd0 is detached __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:816 [inline] lock_journal fs/reiserfs/journal.c:537 [inline] do_journal_begin_r+0x26b/0xde0 fs/reiserfs/journal.c:3054 journal_begin+0x162/0x3d0 fs/reiserfs/journal.c:3262 reiserfs_dirty_inode+0xd9/0x200 fs/reiserfs/super.c:716 __mark_inode_dirty+0x11e/0xf40 fs/fs-writeback.c:2134 mark_inode_dirty include/linux/fs.h:2026 [inline] reiserfs_ioctl+0x6f6/0x8b0 fs/reiserfs/ioctl.c:118 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 RIP: 0033:0x7f92ad4f80d9 RSP: 002b:00007f92aba6a168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f92ad617f80 RCX: 00007f92ad4f80d9 RDX: 0000000020000380 RSI: 0000000040087602 RDI: 0000000000000004 RBP: 00007f92ad553ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff3a8d741f R14: 00007f92aba6a300 R15: 0000000000022000 ubi0: attaching mtd0 ubi0: scanning is finished ubi0: attached mtd0 (name "mtdram test device", size 0 MiB) ubi0: PEB size: 4096 bytes (4 KiB), LEB size: 3968 bytes ubi0: min./max. I/O unit sizes: 1/64, sub-page size 1 ubi0: VID header offset: 64 (aligned 64), data offset: 128 ubi0: good PEBs: 32, bad PEBs: 0, corrupted PEBs: 0 ubi0: user volume: 0, internal volumes: 1, max. volumes count: 23 ubi0: max/mean erase counter: 1/1, WL threshold: 4096, image sequence number: 3435016007 ubi0: available PEBs: 28, total reserved PEBs: 4, PEBs reserved for bad PEB handling: 0 ubi0: background thread "ubi_bgt0d" started, PID 12285 ubi0: detaching mtd0 ubi0: mtd0 is detached ubi0: attaching mtd0 ubi0: scanning is finished ubi0: attached mtd0 (name "mtdram test device", size 0 MiB) ubi0: PEB size: 4096 bytes (4 KiB), LEB size: 3968 bytes ubi0: min./max. I/O unit sizes: 1/64, sub-page size 1 ubi0: VID header offset: 64 (aligned 64), data offset: 128 ubi0: good PEBs: 32, bad PEBs: 0, corrupted PEBs: 0 ubi0: user volume: 0, internal volumes: 1, max. volumes count: 23 ubi0: max/mean erase counter: 1/1, WL threshold: 4096, image sequence number: 3435016007 ubi0: available PEBs: 28, total reserved PEBs: 4, PEBs reserved for bad PEB handling: 0 ubi0: background thread "ubi_bgt0d" started, PID 12336 ubi0: detaching mtd0 ubi0: mtd0 is detached EXT4-fs (loop3): Unrecognized mount option "syz_tun" or missing value EXT4-fs (loop3): Unrecognized mount option "syz_tun" or missing value EXT4-fs (loop4): Unrecognized mount option "syz_tun" or missing value EXT4-fs (loop2): Unrecognized mount option "syz_tun" or missing value EXT4-fs (loop1): Unrecognized mount option "syz_tun" or missing value EXT4-fs (loop4): Unrecognized mount option "syz_tun" or missing value EXT4-fs (loop3): Unrecognized mount option "syz_tun" or missing value EXT4-fs (loop2): Unrecognized mount option "syz_tun" or missing value 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 (loop1): Unrecognized mount option "syz_tun" or missing value EXT4-fs (loop4): Unrecognized mount option "syz_tun" or missing value EXT4-fs (loop3): Unrecognized mount option "syz_tun" or missing value print_req_error: I/O error, dev loop1, sector 0 Buffer I/O error on dev loop1, logical block 0, async page read print_req_error: I/O error, dev loop1, sector 4 Buffer I/O error on dev loop1, logical block 2, async page read print_req_error: I/O error, dev loop1, sector 6 Buffer I/O error on dev loop1, logical block 3, async page read print_req_error: I/O error, dev loop4, sector 0 Buffer I/O error on dev loop4, logical block 0, async page read print_req_error: I/O error, dev loop4, sector 4 EXT4-fs (loop2): Unrecognized mount option "syz_tun" or missing value Buffer I/O error on dev loop4, logical block 2, async page read print_req_error: I/O error, dev loop4, sector 6 Buffer I/O error on dev loop4, logical block 3, async page read print_req_error: I/O error, dev loop2, sector 0 Buffer I/O error on dev loop2, logical block 0, async page read EXT4-fs (loop1): Unrecognized mount option "syz_tun" or missing value squashfs: SQUASHFS error: unable to read inode lookup table kvm: emulating exchange as write EXT4-fs (loop5): couldn't mount RDWR because of unsupported optional features (8000) squashfs: SQUASHFS error: unable to read inode lookup table