XFS (loop0): Invalid superblock magic number ====================================================== WARNING: possible circular locking dependency detected 4.19.49 #21 Not tainted ------------------------------------------------------ syz-executor.3/22039 is trying to acquire lock: 000000003a60779c (&sig->cred_guard_mutex){+.+.}, at: do_io_accounting+0x1f4/0x830 fs/proc/base.c:2704 but task is already holding lock: 000000001a71fab4 (&p->lock){+.+.}, at: seq_read+0x71/0x1110 fs/seq_file.c:161 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&p->lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xf7/0x1300 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 seq_read+0x71/0x1110 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+0x490/0x640 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+0x478/0x890 fs/splice.c:417 do_splice_to+0x127/0x180 fs/splice.c:881 splice_direct_to_actor+0x256/0x890 fs/splice.c:953 do_splice_direct+0x1da/0x2a0 fs/splice.c:1062 do_sendfile+0x597/0xce0 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+0x1dd/0x220 fs/read_write.c:1494 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #2 (sb_writers#6){.+.+}: 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+0x20b/0x360 fs/super.c:1387 sb_start_write include/linux/fs.h:1578 [inline] mnt_want_write+0x3f/0xc0 fs/namespace.c:360 ovl_want_write+0x76/0xa0 fs/overlayfs/util.c:24 ovl_xattr_set+0x53/0x5b0 fs/overlayfs/inode.c:332 ovl_other_xattr_set+0x39/0x50 fs/overlayfs/super.c:946 __vfs_setxattr+0x11f/0x180 fs/xattr.c:149 __vfs_setxattr_noperm+0x11c/0x410 fs/xattr.c:180 vfs_setxattr+0xda/0x100 fs/xattr.c:223 setxattr+0x26f/0x380 fs/xattr.c:450 path_setxattr+0x197/0x1b0 fs/xattr.c:469 __do_sys_lsetxattr fs/xattr.c:491 [inline] __se_sys_lsetxattr fs/xattr.c:487 [inline] __x64_sys_lsetxattr+0xc1/0x150 fs/xattr.c:487 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #1 (&ovl_i_mutex_dir_key[depth]){++++}: down_read+0x3b/0xb0 kernel/locking/rwsem.c:24 inode_lock_shared include/linux/fs.h:757 [inline] lookup_slow+0x4a/0x80 fs/namei.c:1687 walk_component+0x747/0x2000 fs/namei.c:1810 link_path_walk.part.0+0x980/0x1330 fs/namei.c:2141 link_path_walk fs/namei.c:2072 [inline] path_openat+0x1f9/0x4690 fs/namei.c:3533 do_filp_open+0x1a1/0x280 fs/namei.c:3564 do_open_execat+0x140/0x660 fs/exec.c:853 __do_execve_file.isra.0+0x15a4/0x2150 fs/exec.c:1755 do_execveat_common fs/exec.c:1866 [inline] do_execve fs/exec.c:1883 [inline] __do_sys_execve fs/exec.c:1964 [inline] __se_sys_execve fs/exec.c:1959 [inline] __x64_sys_execve+0x8f/0xc0 fs/exec.c:1959 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&sig->cred_guard_mutex){+.+.}: lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3900 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xf7/0x1300 kernel/locking/mutex.c:1072 mutex_lock_killable_nested+0x16/0x20 kernel/locking/mutex.c:1102 do_io_accounting+0x1f4/0x830 fs/proc/base.c:2704 proc_tgid_io_accounting+0x23/0x30 fs/proc/base.c:2753 proc_single_show+0xf0/0x180 fs/proc/base.c:737 seq_read+0x4ca/0x1110 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+0x490/0x640 fs/read_write.c:925 vfs_readv+0xf0/0x160 fs/read_write.c:987 do_preadv+0x1c4/0x280 fs/read_write.c:1071 __do_sys_preadv fs/read_write.c:1121 [inline] __se_sys_preadv fs/read_write.c:1116 [inline] __x64_sys_preadv+0x9a/0xf0 fs/read_write.c:1116 do_syscall_64+0xfd/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: &sig->cred_guard_mutex --> sb_writers#6 --> &p->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&p->lock); lock(sb_writers#6); lock(&p->lock); lock(&sig->cred_guard_mutex); *** DEADLOCK *** 1 lock held by syz-executor.3/22039: #0: 000000001a71fab4 (&p->lock){+.+.}, at: seq_read+0x71/0x1110 fs/seq_file.c:161 stack backtrace: CPU: 1 PID: 22039 Comm: syz-executor.3 Not tainted 4.19.49 #21 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+0x172/0x1f0 lib/dump_stack.c:113 print_circular_bug.isra.0.cold+0x1cc/0x28f 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+0x2e6d/0x48f0 kernel/locking/lockdep.c:3411 lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:3900 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xf7/0x1300 kernel/locking/mutex.c:1072 mutex_lock_killable_nested+0x16/0x20 kernel/locking/mutex.c:1102 do_io_accounting+0x1f4/0x830 fs/proc/base.c:2704 proc_tgid_io_accounting+0x23/0x30 fs/proc/base.c:2753 proc_single_show+0xf0/0x180 fs/proc/base.c:737 seq_read+0x4ca/0x1110 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+0x490/0x640 fs/read_write.c:925 vfs_readv+0xf0/0x160 fs/read_write.c:987 do_preadv+0x1c4/0x280 fs/read_write.c:1071 __do_sys_preadv fs/read_write.c:1121 [inline] __se_sys_preadv fs/read_write.c:1116 [inline] __x64_sys_preadv+0x9a/0xf0 fs/read_write.c:1116 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459279 Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f0b4c3e0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459279 RDX: 1000000000000237 RSI: 0000000020000480 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0b4c3e16d4 R13: 00000000004c6376 R14: 00000000004dae78 R15: 00000000ffffffff kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop2' (000000009271126c): kobject_uevent_env kobject: 'loop2' (000000009271126c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (0000000033fbe7fc): kobject_uevent_env kobject: 'loop5' (0000000033fbe7fc): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (0000000067421b69): kobject_uevent_env kobject: 'loop3' (0000000067421b69): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (0000000033fbe7fc): kobject_uevent_env kobject: 'loop5' (0000000033fbe7fc): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop2' (000000009271126c): kobject_uevent_env kobject: 'loop2' (000000009271126c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop4' (00000000b7fca680): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop4' (00000000b7fca680): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (0000000033fbe7fc): kobject_uevent_env kobject: 'loop5' (0000000033fbe7fc): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (0000000067421b69): kobject_uevent_env kobject: 'loop3' (0000000067421b69): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (000000009271126c): kobject_uevent_env kobject: 'loop2' (000000009271126c): fill_kobj_path: path = '/devices/virtual/block/loop2' XFS (loop0): Invalid superblock magic number kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (0000000033fbe7fc): kobject_uevent_env kobject: 'loop5' (0000000033fbe7fc): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (0000000067421b69): kobject_uevent_env kobject: 'loop3' (0000000067421b69): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (000000009271126c): kobject_uevent_env kobject: 'loop2' (000000009271126c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (0000000033fbe7fc): kobject_uevent_env kobject: 'loop5' (0000000033fbe7fc): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (0000000067421b69): kobject_uevent_env kobject: 'loop3' (0000000067421b69): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000b7fca680): kobject_uevent_env kobject: 'loop4' (00000000b7fca680): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop5' (0000000033fbe7fc): kobject_uevent_env kobject: 'loop5' (0000000033fbe7fc): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (0000000067421b69): kobject_uevent_env kobject: 'loop3' (0000000067421b69): fill_kobj_path: path = '/devices/virtual/block/loop3' XFS (loop0): Invalid superblock magic number kobject: 'loop2' (000000009271126c): kobject_uevent_env kobject: 'loop2' (000000009271126c): fill_kobj_path: path = '/devices/virtual/block/loop2' protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (0000000033fbe7fc): kobject_uevent_env kobject: 'loop5' (0000000033fbe7fc): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (0000000067421b69): kobject_uevent_env kobject: 'loop3' (0000000067421b69): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (0000000033fbe7fc): kobject_uevent_env kobject: 'loop5' (0000000033fbe7fc): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (0000000067421b69): kobject_uevent_env kobject: 'loop3' (0000000067421b69): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (000000009271126c): kobject_uevent_env kobject: 'loop2' (000000009271126c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000b7fca680): kobject_uevent_env kobject: 'loop4' (00000000b7fca680): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop3' (0000000067421b69): kobject_uevent_env kobject: 'loop3' (0000000067421b69): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (0000000033fbe7fc): kobject_uevent_env kobject: 'loop5' (0000000033fbe7fc): fill_kobj_path: path = '/devices/virtual/block/loop5' XFS (loop0): Invalid superblock magic number kobject: 'loop2' (000000009271126c): kobject_uevent_env kobject: 'loop2' (000000009271126c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (0000000033fbe7fc): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (0000000033fbe7fc): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop4' (00000000b7fca680): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop4' (00000000b7fca680): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (0000000067421b69): kobject_uevent_env kobject: 'loop3' (0000000067421b69): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop2' (000000009271126c): kobject_uevent_env kobject: 'loop2' (000000009271126c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop5' (0000000033fbe7fc): kobject_uevent_env kobject: 'loop5' (0000000033fbe7fc): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop4' (00000000b7fca680): kobject_uevent_env kobject: 'loop4' (00000000b7fca680): fill_kobj_path: path = '/devices/virtual/block/loop4' kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop3' (0000000067421b69): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (0000000067421b69): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop3' (0000000067421b69): kobject_uevent_env kobject: 'loop3' (0000000067421b69): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop2' (000000009271126c): kobject_uevent_env kobject: 'loop2' (000000009271126c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop5' (0000000033fbe7fc): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop5' (0000000033fbe7fc): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop3' (0000000067421b69): kobject_uevent_env kobject: 'loop3' (0000000067421b69): fill_kobj_path: path = '/devices/virtual/block/loop3' kobject: 'loop5' (0000000033fbe7fc): kobject_uevent_env kobject: 'loop5' (0000000033fbe7fc): fill_kobj_path: path = '/devices/virtual/block/loop5' XFS (loop0): Invalid superblock magic number kobject: 'loop2' (000000009271126c): kobject_uevent_env kobject: 'loop2' (000000009271126c): fill_kobj_path: path = '/devices/virtual/block/loop2' kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop0' (0000000021f0d687): kobject_uevent_env kobject: 'loop0' (0000000021f0d687): kobject_uevent_env