EXT4-fs (loop0): 1 truncate cleaned up EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc2-syzkaller-g7adf8b1afc14 #0 Not tainted ------------------------------------------------------ syz.0.25/5640 is trying to acquire lock: ffff8880432a0438 (&sb->s_type->i_mutex_key#8/1){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] ffff8880432a0438 (&sb->s_type->i_mutex_key#8/1){+.+.}-{4:4}, at: ext4_xattr_inode_create fs/ext4/xattr.c:1506 [inline] ffff8880432a0438 (&sb->s_type->i_mutex_key#8/1){+.+.}-{4:4}, at: ext4_xattr_inode_lookup_create+0x1846/0x1cd0 fs/ext4/xattr.c:1588 but task is already holding lock: ffff8880432a3e38 (&ei->i_data_sem/3){++++}-{4:4}, at: ext4_setattr+0x15f1/0x1c60 fs/ext4/inode.c:5564 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ei->i_data_sem/3){++++}-{4:4}: lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866 down_write+0x9c/0x220 kernel/locking/rwsem.c:1577 ext4_update_i_disksize fs/ext4/ext4.h:3402 [inline] ext4_xattr_inode_write fs/ext4/xattr.c:1444 [inline] ext4_xattr_inode_lookup_create+0x14df/0x1cd0 fs/ext4/xattr.c:1594 ext4_xattr_ibody_set+0x214/0x730 fs/ext4/xattr.c:2258 ext4_xattr_set_handle+0x103a/0x1a20 fs/ext4/xattr.c:2435 ext4_xattr_set+0x284/0x400 fs/ext4/xattr.c:2549 __vfs_setxattr+0x468/0x4a0 fs/xattr.c:200 __vfs_setxattr_noperm+0x12e/0x660 fs/xattr.c:234 vfs_setxattr+0x223/0x430 fs/xattr.c:321 do_setxattr fs/xattr.c:636 [inline] filename_setxattr+0x2dd/0x480 fs/xattr.c:665 path_setxattrat+0x3f7/0x4c0 fs/xattr.c:713 __do_sys_lsetxattr fs/xattr.c:754 [inline] __se_sys_lsetxattr fs/xattr.c:750 [inline] __x64_sys_lsetxattr+0xbf/0xe0 fs/xattr.c:750 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&sb->s_type->i_mutex_key#8/1){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain+0xa69/0x24e0 kernel/locking/lockdep.c:3909 __lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235 lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866 down_write+0x9c/0x220 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:867 [inline] ext4_xattr_inode_create fs/ext4/xattr.c:1506 [inline] ext4_xattr_inode_lookup_create+0x1846/0x1cd0 fs/ext4/xattr.c:1588 ext4_xattr_block_set+0x26e/0x32c0 fs/ext4/xattr.c:1908 ext4_xattr_move_to_block fs/ext4/xattr.c:2659 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2734 [inline] ext4_expand_extra_isize_ea+0x1452/0x2100 fs/ext4/xattr.c:2822 __ext4_expand_extra_isize+0x309/0x410 fs/ext4/inode.c:5950 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5993 [inline] __ext4_mark_inode_dirty+0x526/0x880 fs/ext4/inode.c:6071 ext4_setattr+0x1672/0x1c60 fs/ext4/inode.c:5567 notify_change+0xbca/0xe90 fs/attr.c:552 do_truncate+0x222/0x310 fs/open.c:65 vfs_truncate+0x4a6/0x540 fs/open.c:115 do_sys_truncate+0xd8/0x190 fs/open.c:138 __do_sys_truncate fs/open.c:150 [inline] __se_sys_truncate fs/open.c:148 [inline] __x64_sys_truncate+0x5b/0x70 fs/open.c:148 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->i_data_sem/3); lock(&sb->s_type->i_mutex_key#8/1); lock(&ei->i_data_sem/3); lock(&sb->s_type->i_mutex_key#8/1); *** DEADLOCK *** 5 locks held by syz.0.25/5640: #0: ffff88805151a420 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:556 #1: ffff8880432a3fa8 (&sb->s_type->i_mutex_key#8){++++}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] #1: ffff8880432a3fa8 (&sb->s_type->i_mutex_key#8){++++}-{4:4}, at: do_truncate+0x20e/0x310 fs/open.c:63 #2: ffff8880432a4148 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock include/linux/fs.h:912 [inline] #2: ffff8880432a4148 (mapping.invalidate_lock){++++}-{4:4}, at: ext4_setattr+0xf59/0x1c60 fs/ext4/inode.c:5512 #3: ffff8880432a3e38 (&ei->i_data_sem/3){++++}-{4:4}, at: ext4_setattr+0x15f1/0x1c60 fs/ext4/inode.c:5564 #4: ffff8880432a3c38 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline] #4: ffff8880432a3c38 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5990 [inline] #4: ffff8880432a3c38 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x493/0x880 fs/ext4/inode.c:6071 stack backtrace: CPU: 0 UID: 0 PID: 5640 Comm: syz.0.25 Not tainted 6.15.0-rc2-syzkaller-g7adf8b1afc14 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2079 check_noncircular+0x142/0x160 kernel/locking/lockdep.c:2211 check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain+0xa69/0x24e0 kernel/locking/lockdep.c:3909 __lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235 lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866 down_write+0x9c/0x220 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:867 [inline] ext4_xattr_inode_create fs/ext4/xattr.c:1506 [inline] ext4_xattr_inode_lookup_create+0x1846/0x1cd0 fs/ext4/xattr.c:1588 ext4_xattr_block_set+0x26e/0x32c0 fs/ext4/xattr.c:1908 ext4_xattr_move_to_block fs/ext4/xattr.c:2659 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2734 [inline] ext4_expand_extra_isize_ea+0x1452/0x2100 fs/ext4/xattr.c:2822 __ext4_expand_extra_isize+0x309/0x410 fs/ext4/inode.c:5950 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5993 [inline] __ext4_mark_inode_dirty+0x526/0x880 fs/ext4/inode.c:6071 ext4_setattr+0x1672/0x1c60 fs/ext4/inode.c:5567 notify_change+0xbca/0xe90 fs/attr.c:552 do_truncate+0x222/0x310 fs/open.c:65 vfs_truncate+0x4a6/0x540 fs/open.c:115 do_sys_truncate+0xd8/0x190 fs/open.c:138 __do_sys_truncate fs/open.c:150 [inline] __se_sys_truncate fs/open.c:148 [inline] __x64_sys_truncate+0x5b/0x70 fs/open.c:148 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa233f8d169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa234e9e038 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007fa2341a5fa0 RCX: 00007fa233f8d169 RDX: 0000000000000000 RSI: 000000000000003b RDI: 0000400000000180 RBP: 00007fa23400e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fa2341a5fa0 R15: 00007ffeefd5d848