====================================================== WARNING: possible circular locking dependency detected 4.14.307-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/12609 is trying to acquire lock: (&type->i_mutex_dir_key#10){+.+.}, at: [] inode_lock include/linux/fs.h:719 [inline] (&type->i_mutex_dir_key#10){+.+.}, at: [] do_last fs/namei.c:3331 [inline] (&type->i_mutex_dir_key#10){+.+.}, at: [] path_openat+0xde2/0x2970 fs/namei.c:3571 but task is already holding lock: (sb_writers#16){.+.+}, at: [] sb_start_write include/linux/fs.h:1551 [inline] (sb_writers#16){.+.+}, 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#16){.+.+}: 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 -> #1 (&sbi->lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 reiserfs_write_lock+0x75/0xf0 fs/reiserfs/lock.c:27 reiserfs_lookup+0x130/0x400 fs/reiserfs/namei.c:363 lookup_real fs/namei.c:1555 [inline] __lookup_hash fs/namei.c:1575 [inline] __lookup_hash+0x1bb/0x270 fs/namei.c:1563 lookup_one_len+0x279/0x3a0 fs/namei.c:2539 reiserfs_lookup_privroot+0x92/0x270 fs/reiserfs/xattr.c:970 reiserfs_fill_super+0x1772/0x2990 fs/reiserfs/super.c:2199 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 (&type->i_mutex_dir_key#10){+.+.}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 down_write+0x34/0x90 kernel/locking/rwsem.c:54 inode_lock include/linux/fs.h:719 [inline] do_last fs/namei.c:3331 [inline] path_openat+0xde2/0x2970 fs/namei.c:3571 do_filp_open+0x179/0x3c0 fs/namei.c:3605 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+0x5e/0xd3 other info that might help us debug this: Chain exists of: &type->i_mutex_dir_key#10 --> &sbi->lock --> sb_writers#16 Possible unsafe locking scenario: attempt to access beyond end of device CPU0 CPU1 ---- ---- lock(sb_writers#16); lock(&sbi->lock); lock(sb_writers#16); lock(&type->i_mutex_dir_key#10); *** DEADLOCK *** 1 lock held by syz-executor.4/12609: #0: (sb_writers#16){.+.+}, at: [] sb_start_write include/linux/fs.h:1551 [inline] #0: (sb_writers#16){.+.+}, at: [] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 stack backtrace: loop2: rw=2049, want=45104, limit=40427 CPU: 1 PID: 12609 Comm: syz-executor.4 Not tainted 4.14.307-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 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 down_write+0x34/0x90 kernel/locking/rwsem.c:54 inode_lock include/linux/fs.h:719 [inline] do_last fs/namei.c:3331 [inline] path_openat+0xde2/0x2970 fs/namei.c:3571 do_filp_open+0x179/0x3c0 fs/namei.c:3605 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+0x5e/0xd3 RIP: 0033:0x7fa0ab0500f9 RSP: 002b:00007fa0a95c2168 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007fa0ab16ff80 RCX: 00007fa0ab0500f9 RDX: 0000000000000000 RSI: 0000000000143142 RDI: 0000000020002000 RBP: 00007fa0ab0abae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc4e95b93f R14: 00007fa0a95c2300 R15: 0000000000022000 REISERFS (device loop4): found reiserfs format "3.6" with non-standard journal F2FS-fs (loop0): Wrong SIT boundary, start(1536) end(2560) blocks(63488) F2FS-fs (loop0): Can't find valid F2FS filesystem in 2th superblock REISERFS (device loop4): using ordered data mode F2FS-fs (loop0): invalid crc value reiserfs: using flush barriers F2FS-fs (loop0): Found nat_bits in checkpoint REISERFS (device loop4): journal params: device loop4, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30 F2FS-fs (loop0): Try to recover 2th superblock, ret: 0 REISERFS (device loop4): checking transaction log (loop4) F2FS-fs (loop0): Mounted with checkpoint version = 753bd00b F2FS-fs (loop2): Found nat_bits in checkpoint REISERFS (device loop4): Using r5 hash to sort names REISERFS (device loop4): Created .reiserfs_priv - reserved for xattr storage. F2FS-fs (loop2): Mounted with checkpoint version = 48b305e5 kauditd_printk_skb: 5 callbacks suppressed audit: type=1800 audit(1677666421.476:57): pid=12810 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="file0" dev="sda1" ino=14372 res=0 attempt to access beyond end of device loop2: rw=2049, want=45104, limit=40427 audit: type=1804 audit(1677666421.506:58): pid=12810 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir1890049916/syzkaller.4AgesO/107/bus" dev="sda1" ino=14295 res=1 audit: type=1800 audit(1677666421.506:59): pid=12810 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="bus" dev="sda1" ino=14295 res=0 REISERFS (device loop4): found reiserfs format "3.6" with non-standard journal REISERFS (device loop4): using ordered data mode reiserfs: using flush barriers REISERFS (device loop4): journal params: device loop4, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30 REISERFS (device loop4): checking transaction log (loop4) REISERFS (device loop4): Using r5 hash to sort names REISERFS (device loop4): Created .reiserfs_priv - reserved for xattr storage. audit: type=1800 audit(1677666422.766:60): pid=12881 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="file0" dev="sda1" ino=14382 res=0 audit: type=1804 audit(1677666422.826:61): pid=12881 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir1890049916/syzkaller.4AgesO/108/bus" dev="sda1" ino=14386 res=1 audit: type=1800 audit(1677666422.836:62): pid=12881 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="bus" dev="sda1" ino=14386 res=0 audit: type=1800 audit(1677666424.546:63): pid=12909 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="file0" dev="sda1" ino=14399 res=0 audit: type=1804 audit(1677666424.707:64): pid=12909 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir1890049916/syzkaller.4AgesO/109/bus" dev="sda1" ino=14400 res=1 REISERFS (device loop4): found reiserfs format "3.6" with non-standard journal audit: type=1800 audit(1677666424.707:65): pid=12909 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="bus" dev="sda1" ino=14400 res=0 REISERFS (device loop4): using ordered data mode reiserfs: using flush barriers REISERFS (device loop4): journal params: device loop4, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30 REISERFS (device loop4): checking transaction log (loop4) audit: type=1800 audit(1677666425.427:66): pid=12929 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="file0" dev="sda1" ino=14372 res=0 kauditd_printk_skb: 2 callbacks suppressed audit: type=1800 audit(1677666427.467:69): pid=12942 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="file0" dev="sda1" ino=14401 res=0 audit: type=1804 audit(1677666427.477:70): pid=12942 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir986081721/syzkaller.wxEOVy/111/bus" dev="sda1" ino=14402 res=1 audit: type=1800 audit(1677666427.477:71): pid=12942 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.5" name="bus" dev="sda1" ino=14402 res=0 REISERFS (device loop4): Using r5 hash to sort names REISERFS (device loop4): Created .reiserfs_priv - reserved for xattr storage.