====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.2.362/5335 is trying to acquire lock: ffff88801a1eabd8 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0x20f/0x2df0 fs/ext4/inode.c:2689 but task is already holding lock: ffff88805f1a6e70 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:165 [inline] ffff88805f1a6e70 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5945 [inline] ffff88805f1a6e70 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x3e8/0x700 fs/ext4/inode.c:6026 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ei->xattr_sem){++++}-{3:3}: down_write+0x38/0x60 kernel/locking/rwsem.c:1551 ext4_write_lock_xattr fs/ext4/xattr.h:158 [inline] ext4_destroy_inline_data+0x24/0xe0 fs/ext4/inline.c:1900 ext4_writepages+0x670/0x2df0 fs/ext4/inode.c:2735 do_writepages+0x476/0x6e0 mm/page-writeback.c:2386 filemap_fdatawrite_wbc+0x1eb/0x240 mm/filemap.c:400 __filemap_fdatawrite_range mm/filemap.c:433 [inline] file_write_and_wait_range+0x14d/0x220 mm/filemap.c:810 ext4_sync_file+0x1ff/0xae0 fs/ext4/fsync.c:151 generic_write_sync include/linux/fs.h:2990 [inline] ext4_buffered_write_iter+0x338/0x3b0 fs/ext4/file.c:275 ext4_file_write_iter+0x74d/0x1700 fs/ext4/file.c:-1 do_iter_readv_writev+0x47e/0x5f0 fs/read_write.c:-1 do_iter_write+0x205/0x7b0 fs/read_write.c:855 vfs_writev fs/read_write.c:928 [inline] do_pwritev+0x240/0x3a0 fs/read_write.c:1025 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #0 (&sbi->s_writepages_rwsem){.+.+}-{0:0}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2c42/0x7d10 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 percpu_down_read+0x46/0x1b0 include/linux/percpu-rwsem.h:51 ext4_writepages+0x20f/0x2df0 fs/ext4/inode.c:2689 do_writepages+0x476/0x6e0 mm/page-writeback.c:2386 __writeback_single_inode+0x153/0xda0 fs/fs-writeback.c:1657 writeback_single_inode+0x3cb/0x8e0 fs/fs-writeback.c:1770 write_inode_now+0x23b/0x2c0 fs/fs-writeback.c:2811 iput_final fs/inode.c:1756 [inline] iput+0x5ab/0x8a0 fs/inode.c:1795 ext4_xattr_set_entry+0x34f4/0x3ea0 fs/ext4/xattr.c:1824 ext4_xattr_block_set+0x4fd/0x2d20 fs/ext4/xattr.c:1923 ext4_xattr_move_to_block fs/ext4/xattr.c:2617 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2692 [inline] ext4_expand_extra_isize_ea+0xf3f/0x19b0 fs/ext4/xattr.c:2780 __ext4_expand_extra_isize+0x301/0x3e0 fs/ext4/inode.c:5905 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5948 [inline] __ext4_mark_inode_dirty+0x469/0x700 fs/ext4/inode.c:6026 ext4_evict_inode+0xa8d/0x1090 fs/ext4/inode.c:282 evict+0x4c9/0x8d0 fs/inode.c:647 ext4_orphan_cleanup+0xad2/0x1320 fs/ext4/orphan.c:472 ext4_fill_super+0x8e25/0x95a0 fs/ext4/super.c:5000 mount_bdev+0x287/0x3c0 fs/super.c:1400 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x24a/0xa40 fs/namespace.c:3034 do_mount fs/namespace.c:3377 [inline] __do_sys_mount fs/namespace.c:3585 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3562 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->xattr_sem); lock(&sbi->s_writepages_rwsem); lock(&ei->xattr_sem); lock(&sbi->s_writepages_rwsem); *** DEADLOCK *** 3 locks held by syz.2.362/5335: #0: ffff88801a1ec0e0 (&type->s_umount_key#28/1){+.+.}-{3:3}, at: alloc_super+0x201/0x950 fs/super.c:229 #1: ffff88801a1ec650 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1811 [inline] #1: ffff88801a1ec650 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1928 [inline] #1: ffff88801a1ec650 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x44a/0x1090 fs/ext4/inode.c:243 #2: ffff88805f1a6e70 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:165 [inline] #2: ffff88805f1a6e70 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5945 [inline] #2: ffff88805f1a6e70 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x3e8/0x700 fs/ext4/inode.c:6026 stack backtrace: CPU: 0 PID: 5335 Comm: syz.2.362 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 check_noncircular+0x296/0x330 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2c42/0x7d10 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 percpu_down_read+0x46/0x1b0 include/linux/percpu-rwsem.h:51 ext4_writepages+0x20f/0x2df0 fs/ext4/inode.c:2689 do_writepages+0x476/0x6e0 mm/page-writeback.c:2386 __writeback_single_inode+0x153/0xda0 fs/fs-writeback.c:1657 writeback_single_inode+0x3cb/0x8e0 fs/fs-writeback.c:1770 write_inode_now+0x23b/0x2c0 fs/fs-writeback.c:2811 iput_final fs/inode.c:1756 [inline] iput+0x5ab/0x8a0 fs/inode.c:1795 ext4_xattr_set_entry+0x34f4/0x3ea0 fs/ext4/xattr.c:1824 ext4_xattr_block_set+0x4fd/0x2d20 fs/ext4/xattr.c:1923 ext4_xattr_move_to_block fs/ext4/xattr.c:2617 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2692 [inline] ext4_expand_extra_isize_ea+0xf3f/0x19b0 fs/ext4/xattr.c:2780 __ext4_expand_extra_isize+0x301/0x3e0 fs/ext4/inode.c:5905 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5948 [inline] __ext4_mark_inode_dirty+0x469/0x700 fs/ext4/inode.c:6026 ext4_evict_inode+0xa8d/0x1090 fs/ext4/inode.c:282 evict+0x4c9/0x8d0 fs/inode.c:647 ext4_orphan_cleanup+0xad2/0x1320 fs/ext4/orphan.c:472 ext4_fill_super+0x8e25/0x95a0 fs/ext4/super.c:5000 mount_bdev+0x287/0x3c0 fs/super.c:1400 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x24a/0xa40 fs/namespace.c:3034 do_mount fs/namespace.c:3377 [inline] __do_sys_mount fs/namespace.c:3585 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3562 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f6ffe67cf4a Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6ffc8d6e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f6ffc8d6ee0 RCX: 00007f6ffe67cf4a RDX: 0000200000000180 RSI: 00002000000001c0 RDI: 00007f6ffc8d6ea0 RBP: 0000200000000180 R08: 00007f6ffc8d6ee0 R09: 0000000000800700 R10: 0000000000800700 R11: 0000000000000246 R12: 00002000000001c0 R13: 00007f6ffc8d6ea0 R14: 000000000000046f R15: 000000000000002c EXT4-fs error (device loop2): ext4_xattr_inode_iget:401: inode #11: comm syz.2.362: iget: bad extra_isize 90 (inode size 256) EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs error (device loop2): ext4_xattr_inode_iget:406: comm syz.2.362: error while reading EA inode 11 err=-117 EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs error (device loop2): ext4_xattr_inode_iget:401: inode #11: comm syz.2.362: iget: bad extra_isize 90 (inode size 256) EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs error (device loop2): ext4_xattr_inode_iget:406: comm syz.2.362: error while reading EA inode 11 err=-117 EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs error (device loop2): ext4_xattr_inode_iget:401: inode #18: comm syz.2.362: iget: bad extra_isize 90 (inode size 256) EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs error (device loop2): ext4_xattr_inode_iget:406: comm syz.2.362: error while reading EA inode 18 err=-117 EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs error (device loop2): ext4_xattr_inode_iget:401: inode #18: comm syz.2.362: iget: bad extra_isize 90 (inode size 256) EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs error (device loop2): ext4_xattr_inode_iget:406: comm syz.2.362: error while reading EA inode 18 err=-117 EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs (loop2): 1 orphan inode deleted EXT4-fs (loop2): mounted filesystem without journal. Opts: nodioread_nolock,errors=remount-ro,debug_want_extra_isize=0x000000000000005a,nouid32,resgid=0x0000000000000000,acl,init_itable=0x0000000000000003,. Quota mode: none.