memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=2875 'syz.3.17' loop3: detected capacity change from 0 to 512 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.3.17/2875 is trying to acquire lock: ffff88810828ab90 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1691 [inline] ffff88810828ab90 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: ext4_writepages+0xaf/0x130 fs/ext4/inode.c:2791 but task is already holding lock: ffff8881137c4c48 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:162 [inline] ffff8881137c4c48 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5835 [inline] ffff8881137c4c48 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x124/0x200 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_write+0x29/0xc0 kernel/locking/rwsem.c:1573 ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] ext4_xattr_set_handle+0x10b/0x720 fs/ext4/xattr.c:2357 ext4_initxattrs+0x38/0x60 fs/ext4/xattr_security.c:44 security_inode_init_security+0xe5/0x180 security/security.c:1630 __ext4_new_inode+0x119e/0x1400 fs/ext4/ialloc.c:1326 ext4_create+0xab/0x190 fs/ext4/namei.c:2829 lookup_open fs/namei.c:3492 [inline] open_last_lookups fs/namei.c:3560 [inline] path_openat+0x4d3/0xd20 fs/namei.c:3790 do_filp_open+0x9e/0x120 fs/namei.c:3820 do_sys_openat2+0x79/0x170 fs/open.c:1402 do_sys_open fs/open.c:1418 [inline] __do_sys_openat fs/open.c:1434 [inline] __se_sys_openat fs/open.c:1429 [inline] __x64_sys_openat+0x6e/0x80 fs/open.c:1429 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x6f/0xd9 -> #1 (jbd2_handle){++++}-{0:0}: start_this_handle+0x4dd/0x5a0 fs/jbd2/transaction.c:463 jbd2__journal_start+0xf0/0x1f0 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0xc4/0x210 fs/ext4/ext4_jbd2.c:111 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_do_writepages+0x4b5/0xf10 fs/ext4/inode.c:2686 ext4_writepages+0xd4/0x130 fs/ext4/inode.c:2792 do_writepages+0xbd/0x210 mm/page-writeback.c:2551 __writeback_single_inode+0x44/0x3a0 fs/fs-writeback.c:1603 writeback_sb_inodes+0x29c/0x5b0 fs/fs-writeback.c:1894 __writeback_inodes_wb+0x93/0xe0 fs/fs-writeback.c:1965 wb_writeback+0x166/0x390 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+0x406/0x530 fs/fs-writeback.c:2251 process_one_work+0x270/0x4c0 kernel/workqueue.c:2408 worker_thread+0x23a/0x3a0 kernel/workqueue.c:2555 kthread+0xe8/0x100 kernel/kthread.c:379 ret_from_fork+0x29/0x50 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+0x1266/0x2130 kernel/locking/lockdep.c:5088 lock_acquire+0xd8/0x240 kernel/locking/lockdep.c:5705 percpu_down_read+0x2b/0xc0 include/linux/percpu-rwsem.h:51 ext4_writepages_down_read fs/ext4/ext4.h:1691 [inline] ext4_writepages+0xaf/0x130 fs/ext4/inode.c:2791 do_writepages+0xbd/0x210 mm/page-writeback.c:2551 __writeback_single_inode+0x44/0x3a0 fs/fs-writeback.c:1603 writeback_single_inode+0x6e/0x220 fs/fs-writeback.c:1724 write_inode_now+0xb7/0xd0 fs/fs-writeback.c:2760 iput_final fs/inode.c:1776 [inline] iput+0x176/0x260 fs/inode.c:1815 ext4_xattr_set_entry+0xddc/0x1230 fs/ext4/xattr.c:1857 ext4_xattr_block_set+0x1d4/0xbf0 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+0x659/0x8e0 fs/ext4/xattr.c:2820 __ext4_expand_extra_isize+0xc3/0x140 fs/ext4/inode.c:5795 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5838 [inline] __ext4_mark_inode_dirty+0x15a/0x200 fs/ext4/inode.c:5916 ext4_evict_inode+0x341/0x590 fs/ext4/inode.c:251 evict+0xd1/0x2a0 fs/inode.c:665 ext4_orphan_cleanup+0x364/0x640 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5567 [inline] ext4_fill_super+0x191b/0x1b60 fs/ext4/super.c:5683 get_tree_bdev+0x1ce/0x260 fs/super.c:1319 vfs_get_tree+0x24/0x90 fs/super.c:1520 do_new_mount+0x12b/0x350 fs/namespace.c:3335 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount+0x168/0x1c0 fs/namespace.c:3861 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x55/0xb0 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.3.17/2875: #0: ffff8881082880e0 (&type->s_umount_key#23/1){+.+.}-{4:4}, at: alloc_super+0xd2/0x390 fs/super.c:228 #1: ffff888108288628 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1495 [inline] #1: ffff888108288628 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1617 [inline] #1: ffff888108288628 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x114/0x590 fs/ext4/inode.c:212 #2: ffff8881137c4c48 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:162 [inline] #2: ffff8881137c4c48 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5835 [inline] #2: ffff8881137c4c48 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x124/0x200 fs/ext4/inode.c:5916 stack backtrace: CPU: 1 PID: 2875 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_lvl+0x72/0xc0 lib/dump_stack.c:106 check_noncircular+0xe5/0xf0 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+0x1266/0x2130 kernel/locking/lockdep.c:5088 lock_acquire+0xd8/0x240 kernel/locking/lockdep.c:5705 percpu_down_read+0x2b/0xc0 include/linux/percpu-rwsem.h:51 ext4_writepages_down_read fs/ext4/ext4.h:1691 [inline] ext4_writepages+0xaf/0x130 fs/ext4/inode.c:2791 do_writepages+0xbd/0x210 mm/page-writeback.c:2551 __writeback_single_inode+0x44/0x3a0 fs/fs-writeback.c:1603 writeback_single_inode+0x6e/0x220 fs/fs-writeback.c:1724 write_inode_now+0xb7/0xd0 fs/fs-writeback.c:2760 iput_final fs/inode.c:1776 [inline] iput+0x176/0x260 fs/inode.c:1815 ext4_xattr_set_entry+0xddc/0x1230 fs/ext4/xattr.c:1857 ext4_xattr_block_set+0x1d4/0xbf0 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+0x659/0x8e0 fs/ext4/xattr.c:2820 __ext4_expand_extra_isize+0xc3/0x140 fs/ext4/inode.c:5795 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5838 [inline] __ext4_mark_inode_dirty+0x15a/0x200 fs/ext4/inode.c:5916 ext4_evict_inode+0x341/0x590 fs/ext4/inode.c:251 evict+0xd1/0x2a0 fs/inode.c:665 ext4_orphan_cleanup+0x364/0x640 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5567 [inline] ext4_fill_super+0x191b/0x1b60 fs/ext4/super.c:5683 get_tree_bdev+0x1ce/0x260 fs/super.c:1319 vfs_get_tree+0x24/0x90 fs/super.c:1520 do_new_mount+0x12b/0x350 fs/namespace.c:3335 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount+0x168/0x1c0 fs/namespace.c:3861 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x6f/0xd9 RIP: 0033:0x7fc77499234a 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:00007fc774800e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fc774800ef0 RCX: 00007fc77499234a RDX: 0000200000000180 RSI: 00002000000001c0 RDI: 00007fc774800eb0 RBP: 0000200000000180 R08: 00007fc774800ef0 R09: 0000000000800700 R10: 0000000000800700 R11: 0000000000000246 R12: 00002000000001c0 R13: 00007fc774800eb0 R14: 0000000000000473 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. syz.3.17 (2875) used greatest stack depth: 11384 bytes left