memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=2880 'syz.3.17' loop3: detected capacity change from 0 to 512 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.3.17/2880 is trying to acquire lock: ffff888107371b90 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0xce/0x1e0 mm/page-writeback.c:2551 but task is already holding lock: ffff88811745b968 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:162 [inline] ffff88811745b968 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5835 [inline] ffff88811745b968 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x16f/0x260 fs/ext4/inode.c:5916 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&ei->xattr_sem){++++}-{4:4}: down_read+0x2c/0x100 kernel/locking/rwsem.c:1520 ext4_setattr+0x52c/0xa50 fs/ext4/inode.c:5330 notify_change+0x20a/0x490 fs/attr.c:483 chown_common+0x22d/0x240 fs/open.c:768 do_fchownat+0x9e/0x100 fs/open.c:799 __do_sys_chown fs/open.c:819 [inline] __se_sys_chown fs/open.c:817 [inline] __x64_sys_chown+0x1b/0x30 fs/open.c:817 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3f/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x6f/0xd9 -> #1 (jbd2_handle){++++}-{0:0}: start_this_handle+0x1a3/0x5e0 fs/jbd2/transaction.c:463 jbd2__journal_start+0xf7/0x200 fs/jbd2/transaction.c:520 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_do_writepages+0x34f/0xd30 fs/ext4/inode.c:2686 ext4_writepages+0xea/0x2a0 fs/ext4/inode.c:2792 do_writepages+0xce/0x1e0 mm/page-writeback.c:2551 __writeback_single_inode+0x42/0x3e0 fs/fs-writeback.c:1603 writeback_sb_inodes+0x1f7/0x4d0 fs/fs-writeback.c:1894 __writeback_inodes_wb+0x47/0xf0 fs/fs-writeback.c:1965 wb_writeback+0x2c0/0x350 fs/fs-writeback.c:2070 wb_check_background_flush fs/fs-writeback.c:2136 [inline] wb_do_writeback fs/fs-writeback.c:2224 [inline] wb_workfn+0x2f5/0x550 fs/fs-writeback.c:2251 process_one_work+0x290/0x4f0 kernel/workqueue.c:2408 worker_thread+0x4e/0x320 kernel/workqueue.c:2555 kthread+0xe1/0x110 kernel/kthread.c:379 ret_from_fork+0x2c/0x50 arch/x86/entry/entry_64.S:308 -> #0 (&sbi->s_writepages_rwsem){.+.+}-{0:0}: check_prev_add kernel/locking/lockdep.c:3113 [inline] check_prevs_add kernel/locking/lockdep.c:3232 [inline] validate_chain kernel/locking/lockdep.c:3847 [inline] __lock_acquire+0x13fd/0x1c00 kernel/locking/lockdep.c:5088 lock_acquire kernel/locking/lockdep.c:5705 [inline] lock_acquire+0xcd/0x2c0 kernel/locking/lockdep.c:5670 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] ext4_writepages_down_read fs/ext4/ext4.h:1691 [inline] ext4_writepages+0x7e/0x2a0 fs/ext4/inode.c:2791 do_writepages+0xce/0x1e0 mm/page-writeback.c:2551 __writeback_single_inode+0x42/0x3e0 fs/fs-writeback.c:1603 writeback_single_inode+0x90/0x150 fs/fs-writeback.c:1724 write_inode_now+0x71/0x90 fs/fs-writeback.c:2760 iput_final fs/inode.c:1776 [inline] iput.part.0+0x11e/0x230 fs/inode.c:1815 ext4_xattr_set_entry+0x289/0x1460 fs/ext4/xattr.c:1857 ext4_xattr_block_set+0x205/0x1000 fs/ext4/xattr.c:1956 ext4_xattr_move_to_block fs/ext4/xattr.c:2653 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2728 [inline] ext4_expand_extra_isize_ea+0x3f9/0x910 fs/ext4/xattr.c:2820 __ext4_expand_extra_isize+0xc6/0x120 fs/ext4/inode.c:5795 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5838 [inline] __ext4_mark_inode_dirty+0x1a9/0x260 fs/ext4/inode.c:5916 ext4_evict_inode+0x22e/0x8d0 fs/ext4/inode.c:251 evict+0xcb/0x1d0 fs/inode.c:665 ext4_orphan_cleanup+0x12f/0x520 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5567 [inline] ext4_fill_super+0x2ac3/0x2f40 fs/ext4/super.c:5683 get_tree_bdev+0x179/0x290 fs/super.c:1319 vfs_get_tree+0x22/0xa0 fs/super.c:1520 do_new_mount fs/namespace.c:3335 [inline] path_mount+0x47e/0xb80 fs/namespace.c:3662 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount fs/namespace.c:3861 [inline] __x64_sys_mount+0x115/0x150 fs/namespace.c:3861 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3f/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x6f/0xd9 other info that might help us debug this: Chain exists of: &sbi->s_writepages_rwsem --> jbd2_handle --> &ei->xattr_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->xattr_sem); lock(jbd2_handle); lock(&ei->xattr_sem); rlock(&sbi->s_writepages_rwsem); *** DEADLOCK *** 3 locks held by syz.3.17/2880: #0: ffff8881073730e0 (&type->s_umount_key#24/1){+.+.}-{4:4}, at: alloc_super+0xd4/0x390 fs/super.c:228 #1: ffff888107373628 (sb_internal){.+.+}-{0:0}, at: evict+0xcb/0x1d0 fs/inode.c:665 #2: ffff88811745b968 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:162 [inline] #2: ffff88811745b968 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5835 [inline] #2: ffff88811745b968 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x16f/0x260 fs/ext4/inode.c:5916 stack backtrace: CPU: 1 PID: 2880 Comm: syz.3.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x5c/0xc0 lib/dump_stack.c:106 check_noncircular+0xf8/0x110 kernel/locking/lockdep.c:2188 check_prev_add kernel/locking/lockdep.c:3113 [inline] check_prevs_add kernel/locking/lockdep.c:3232 [inline] validate_chain kernel/locking/lockdep.c:3847 [inline] __lock_acquire+0x13fd/0x1c00 kernel/locking/lockdep.c:5088 lock_acquire kernel/locking/lockdep.c:5705 [inline] lock_acquire+0xcd/0x2c0 kernel/locking/lockdep.c:5670 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] ext4_writepages_down_read fs/ext4/ext4.h:1691 [inline] ext4_writepages+0x7e/0x2a0 fs/ext4/inode.c:2791 do_writepages+0xce/0x1e0 mm/page-writeback.c:2551 __writeback_single_inode+0x42/0x3e0 fs/fs-writeback.c:1603 writeback_single_inode+0x90/0x150 fs/fs-writeback.c:1724 write_inode_now+0x71/0x90 fs/fs-writeback.c:2760 iput_final fs/inode.c:1776 [inline] iput.part.0+0x11e/0x230 fs/inode.c:1815 ext4_xattr_set_entry+0x289/0x1460 fs/ext4/xattr.c:1857 ext4_xattr_block_set+0x205/0x1000 fs/ext4/xattr.c:1956 ext4_xattr_move_to_block fs/ext4/xattr.c:2653 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2728 [inline] ext4_expand_extra_isize_ea+0x3f9/0x910 fs/ext4/xattr.c:2820 __ext4_expand_extra_isize+0xc6/0x120 fs/ext4/inode.c:5795 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5838 [inline] __ext4_mark_inode_dirty+0x1a9/0x260 fs/ext4/inode.c:5916 ext4_evict_inode+0x22e/0x8d0 fs/ext4/inode.c:251 evict+0xcb/0x1d0 fs/inode.c:665 ext4_orphan_cleanup+0x12f/0x520 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5567 [inline] ext4_fill_super+0x2ac3/0x2f40 fs/ext4/super.c:5683 get_tree_bdev+0x179/0x290 fs/super.c:1319 vfs_get_tree+0x22/0xa0 fs/super.c:1520 do_new_mount fs/namespace.c:3335 [inline] path_mount+0x47e/0xb80 fs/namespace.c:3662 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount fs/namespace.c:3861 [inline] __x64_sys_mount+0x115/0x150 fs/namespace.c:3861 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3f/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x6f/0xd9 RIP: 0033:0x7f7ffa4ab34a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7ffa319e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f7ffa319ef0 RCX: 00007f7ffa4ab34a RDX: 0000200000000180 RSI: 00002000000001c0 RDI: 00007f7ffa319eb0 RBP: 0000200000000180 R08: 00007f7ffa319ef0 R09: 0000000000800700 R10: 0000000000800700 R11: 0000000000000246 R12: 00002000000001c0 R13: 00007f7ffa319eb0 R14: 000000000000046f R15: 0000200000000680 EXT4-fs (loop3): 1 orphan inode deleted EXT4-fs (loop3): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.