EXT4-fs (loop9): encrypted files will use data=ordered instead of data journaling mode EXT4-fs (loop9): 1 truncate cleaned up EXT4-fs (loop9): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc5-syzkaller-00158-g3013c33dcbd9 #0 Not tainted ------------------------------------------------------ syz.9.674/8408 is trying to acquire lock: ffff8880540cd378 (&sb->s_type->i_mutex_key#9/1){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] ffff8880540cd378 (&sb->s_type->i_mutex_key#9/1){+.+.}-{4:4}, at: ext4_xattr_inode_create fs/ext4/xattr.c:1506 [inline] ffff8880540cd378 (&sb->s_type->i_mutex_key#9/1){+.+.}-{4:4}, at: ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1588 [inline] ffff8880540cd378 (&sb->s_type->i_mutex_key#9/1){+.+.}-{4:4}, at: ext4_xattr_inode_lookup_create+0x1052/0x1950 fs/ext4/xattr.c:1566 but task is already holding lock: ffff8880540cdbf0 (&ei->i_data_sem/3){++++}-{4:4}, at: ext4_setattr+0x1250/0x2b70 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}: down_write+0x92/0x200 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 fs/ext4/xattr.c:1594 [inline] ext4_xattr_inode_lookup_create+0x1413/0x1950 fs/ext4/xattr.c:1566 ext4_xattr_ibody_set+0x1e9/0x5d0 fs/ext4/xattr.c:2258 ext4_xattr_set_handle+0x93c/0x1480 fs/ext4/xattr.c:2435 ext4_xattr_set+0x14d/0x360 fs/ext4/xattr.c:2549 __vfs_setxattr+0x175/0x1e0 fs/xattr.c:200 __vfs_setxattr_noperm+0x127/0x660 fs/xattr.c:234 __vfs_setxattr_locked+0x182/0x260 fs/xattr.c:295 vfs_setxattr+0x145/0x360 fs/xattr.c:321 do_setxattr+0x145/0x180 fs/xattr.c:636 filename_setxattr+0x16b/0x1d0 fs/xattr.c:665 path_setxattrat+0x1de/0x2a0 fs/xattr.c:713 __do_sys_lsetxattr fs/xattr.c:754 [inline] __se_sys_lsetxattr fs/xattr.c:750 [inline] __x64_sys_lsetxattr+0xc9/0x140 fs/xattr.c:750 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&sb->s_type->i_mutex_key#9/1){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235 lock_acquire kernel/locking/lockdep.c:5866 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823 down_write+0x92/0x200 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 fs/ext4/xattr.c:1588 [inline] ext4_xattr_inode_lookup_create+0x1052/0x1950 fs/ext4/xattr.c:1566 ext4_xattr_block_set+0x818/0x3650 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+0x143d/0x1ab0 fs/ext4/xattr.c:2822 __ext4_expand_extra_isize+0x346/0x480 fs/ext4/inode.c:5950 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5993 [inline] __ext4_mark_inode_dirty+0x544/0x870 fs/ext4/inode.c:6071 ext4_setattr+0x12d2/0x2b70 fs/ext4/inode.c:5567 notify_change+0x6a9/0x1230 fs/attr.c:552 do_truncate+0x15b/0x220 fs/open.c:65 vfs_truncate+0x5d6/0x6e0 fs/open.c:115 do_sys_truncate fs/open.c:138 [inline] __do_sys_truncate fs/open.c:150 [inline] __se_sys_truncate fs/open.c:148 [inline] __x64_sys_truncate+0x172/0x1e0 fs/open.c:148 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 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#9/1); lock(&ei->i_data_sem/3); lock(&sb->s_type->i_mutex_key#9/1); *** DEADLOCK *** 5 locks held by syz.9.674/8408: #0: ffff888012b40420 (sb_writers#4){.+.+}-{0:0}, at: vfs_truncate+0x336/0x6e0 fs/open.c:93 #1: ffff8880540cdd60 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] #1: ffff8880540cdd60 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: do_truncate+0x14a/0x220 fs/open.c:63 #2: ffff8880540cdf00 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_invalidate_lock include/linux/fs.h:912 [inline] #2: ffff8880540cdf00 (mapping.invalidate_lock#2){++++}-{4:4}, at: ext4_setattr+0xe07/0x2b70 fs/ext4/inode.c:5512 #3: ffff8880540cdbf0 (&ei->i_data_sem/3){++++}-{4:4}, at: ext4_setattr+0x1250/0x2b70 fs/ext4/inode.c:5564 #4: ffff8880540cd9f0 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline] #4: ffff8880540cd9f0 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5990 [inline] #4: ffff8880540cd9f0 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x4ba/0x870 fs/ext4/inode.c:6071 stack backtrace: CPU: 1 UID: 0 PID: 8408 Comm: syz.9.674 Not tainted 6.15.0-rc5-syzkaller-00158-g3013c33dcbd9 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2079 check_noncircular+0x14c/0x170 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 kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235 lock_acquire kernel/locking/lockdep.c:5866 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823 down_write+0x92/0x200 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 fs/ext4/xattr.c:1588 [inline] ext4_xattr_inode_lookup_create+0x1052/0x1950 fs/ext4/xattr.c:1566 ext4_xattr_block_set+0x818/0x3650 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+0x143d/0x1ab0 fs/ext4/xattr.c:2822 __ext4_expand_extra_isize+0x346/0x480 fs/ext4/inode.c:5950 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5993 [inline] __ext4_mark_inode_dirty+0x544/0x870 fs/ext4/inode.c:6071 ext4_setattr+0x12d2/0x2b70 fs/ext4/inode.c:5567 notify_change+0x6a9/0x1230 fs/attr.c:552 do_truncate+0x15b/0x220 fs/open.c:65 vfs_truncate+0x5d6/0x6e0 fs/open.c:115 do_sys_truncate fs/open.c:138 [inline] __do_sys_truncate fs/open.c:150 [inline] __se_sys_truncate fs/open.c:148 [inline] __x64_sys_truncate+0x172/0x1e0 fs/open.c:148 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd6aa98e969 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:00007fd6a87f6038 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007fd6aabb5fa0 RCX: 00007fd6aa98e969 RDX: 0000000000000000 RSI: 0000000000008008 RDI: 00002000000000c0 RBP: 00007fd6aaa10ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fd6aabb5fa0 R15: 00007ffc951ab548