====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.9.1034/9408 is trying to acquire lock: ffff88805e9ecc58 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x213/0x2d40 fs/ext4/inode.c:2691 but task is already holding lock: ffff88805e9ea650 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1817 [inline] ffff88805e9ea650 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1934 [inline] ffff88805e9ea650 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x41f/0x1050 fs/ext4/inode.c:245 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (sb_internal){.+.+}-{0:0}: percpu_down_read+0x46/0x1b0 include/linux/percpu-rwsem.h:51 __sb_start_write include/linux/fs.h:1817 [inline] sb_start_intwrite include/linux/fs.h:1934 [inline] ext4_evict_inode+0x41f/0x1050 fs/ext4/inode.c:245 evict+0x4b6/0x8b0 fs/inode.c:647 ext4_ext_migrate+0xc07/0xe50 fs/ext4/migrate.c:588 __ext4_ioctl fs/ext4/ioctl.c:1037 [inline] ext4_ioctl+0x1a84/0x3840 fs/ext4/ioctl.c:1291 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860 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+0x2c66/0x7b50 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+0x213/0x2d40 fs/ext4/inode.c:2691 do_writepages+0x493/0x700 mm/page-writeback.c:2386 __writeback_single_inode+0x153/0xda0 fs/fs-writeback.c:1657 writeback_single_inode+0x3d2/0x8e0 fs/fs-writeback.c:1770 write_inode_now+0x23b/0x2c0 fs/fs-writeback.c:2817 iput_final fs/inode.c:1756 [inline] iput+0x599/0x880 fs/inode.c:1795 ext4_xattr_set_entry+0x1d76/0x3f70 fs/ext4/xattr.c:1827 ext4_xattr_block_set+0x4d7/0x2d00 fs/ext4/xattr.c:1926 ext4_xattr_move_to_block fs/ext4/xattr.c:2622 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2697 [inline] ext4_expand_extra_isize_ea+0xfdc/0x18c0 fs/ext4/xattr.c:2785 __ext4_expand_extra_isize+0x301/0x3e0 fs/ext4/inode.c:5924 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5967 [inline] __ext4_mark_inode_dirty+0x444/0x6c0 fs/ext4/inode.c:6045 ext4_evict_inode+0xa55/0x1050 fs/ext4/inode.c:284 evict+0x4b6/0x8b0 fs/inode.c:647 ext4_orphan_cleanup+0xad8/0x1320 fs/ext4/orphan.c:472 ext4_fill_super+0x8c65/0x93f0 fs/ext4/super.c:5006 mount_bdev+0x28a/0x3c0 fs/super.c:1411 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1541 do_new_mount+0x247/0xa40 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(sb_internal); lock(&sbi->s_writepages_rwsem); lock(sb_internal); lock(&sbi->s_writepages_rwsem); *** DEADLOCK *** 3 locks held by syz.9.1034/9408: #0: ffff88805e9ea0e0 (&type->s_umount_key#28/1){+.+.}-{3:3}, at: alloc_super+0x200/0x970 fs/super.c:229 #1: ffff88805e9ea650 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1817 [inline] #1: ffff88805e9ea650 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1934 [inline] #1: ffff88805e9ea650 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x41f/0x1050 fs/ext4/inode.c:245 #2: ffff8880213fe478 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:165 [inline] #2: ffff8880213fe478 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5964 [inline] #2: ffff8880213fe478 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x3bd/0x6c0 fs/ext4/inode.c:6045 stack backtrace: CPU: 0 PID: 9408 Comm: syz.9.1034 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 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+0x2c66/0x7b50 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+0x213/0x2d40 fs/ext4/inode.c:2691 do_writepages+0x493/0x700 mm/page-writeback.c:2386 __writeback_single_inode+0x153/0xda0 fs/fs-writeback.c:1657 writeback_single_inode+0x3d2/0x8e0 fs/fs-writeback.c:1770 write_inode_now+0x23b/0x2c0 fs/fs-writeback.c:2817 iput_final fs/inode.c:1756 [inline] iput+0x599/0x880 fs/inode.c:1795 ext4_xattr_set_entry+0x1d76/0x3f70 fs/ext4/xattr.c:1827 ext4_xattr_block_set+0x4d7/0x2d00 fs/ext4/xattr.c:1926 ext4_xattr_move_to_block fs/ext4/xattr.c:2622 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2697 [inline] ext4_expand_extra_isize_ea+0xfdc/0x18c0 fs/ext4/xattr.c:2785 __ext4_expand_extra_isize+0x301/0x3e0 fs/ext4/inode.c:5924 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5967 [inline] __ext4_mark_inode_dirty+0x444/0x6c0 fs/ext4/inode.c:6045 ext4_evict_inode+0xa55/0x1050 fs/ext4/inode.c:284 evict+0x4b6/0x8b0 fs/inode.c:647 ext4_orphan_cleanup+0xad8/0x1320 fs/ext4/orphan.c:472 ext4_fill_super+0x8c65/0x93f0 fs/ext4/super.c:5006 mount_bdev+0x28a/0x3c0 fs/super.c:1411 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1541 do_new_mount+0x247/0xa40 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: 0033:0x7fe2ef0743ca 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:00007fe2ed2a9e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fe2ed2a9ee0 RCX: 00007fe2ef0743ca RDX: 0000200000000240 RSI: 0000200000000000 RDI: 00007fe2ed2a9ea0 RBP: 0000200000000240 R08: 00007fe2ed2a9ee0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000000 R13: 00007fe2ed2a9ea0 R14: 000000000000047a R15: 0000200000000040 EXT4-fs error (device loop9): ext4_xattr_inode_iget:401: inode #11: comm syz.9.1034: iget: bad extra_isize 90 (inode size 256) EXT4-fs error (device loop9): ext4_xattr_inode_iget:406: comm syz.9.1034: error while reading EA inode 11 err=-117 EXT4-fs warning (device loop9): ext4_expand_extra_isize_ea:2812: Unable to expand inode 15. Delete some EAs or run e2fsck. EXT4-fs error (device loop9): ext4_xattr_inode_iget:401: inode #11: comm syz.9.1034: iget: bad extra_isize 90 (inode size 256) EXT4-fs error (device loop9): ext4_xattr_inode_iget:406: comm syz.9.1034: error while reading EA inode 11 err=-117 EXT4-fs error (device loop9): ext4_xattr_inode_iget:401: inode #18: comm syz.9.1034: iget: bad extra_isize 90 (inode size 256) EXT4-fs error (device loop9): ext4_xattr_inode_iget:406: comm syz.9.1034: error while reading EA inode 18 err=-117 EXT4-fs error (device loop9): ext4_xattr_inode_iget:401: inode #18: comm syz.9.1034: iget: bad extra_isize 90 (inode size 256) EXT4-fs error (device loop9): ext4_xattr_inode_iget:406: comm syz.9.1034: error while reading EA inode 18 err=-117 EXT4-fs (loop9): 1 orphan inode deleted EXT4-fs (loop9): mounted filesystem without journal. Opts: data_err=ignore,noload,debug_want_extra_isize=0x000000000000005a,abort,oldalloc,noquota,min_batch_time=0x0000000000000003,jqfmt=vfsold,,errors=continue. Quota mode: none.