loop3: detected capacity change from 0 to 512 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.3.689/6857 is trying to acquire lock: ffff888053f0ec18 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x20f/0x2f40 fs/ext4/inode.c:2717 but task is already holding lock: ffff888053f0c650 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1891 [inline] ffff888053f0c650 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:2013 [inline] ffff888053f0c650 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x43c/0x1110 fs/ext4/inode.c:242 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (sb_internal){.+.+}-{0:0}: percpu_down_read+0x44/0x1a0 include/linux/percpu-rwsem.h:51 __sb_start_write include/linux/fs.h:1891 [inline] sb_start_intwrite include/linux/fs.h:2013 [inline] ext4_evict_inode+0x43c/0x1110 fs/ext4/inode.c:242 evict+0x4c9/0x8d0 fs/inode.c:705 ext4_ext_migrate+0xc0c/0xe60 fs/ext4/migrate.c:587 __ext4_ioctl fs/ext4/ioctl.c:1399 [inline] ext4_ioctl+0x1eb1/0x4160 fs/ext4/ioctl.c:1617 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&sbi->s_writepages_rwsem){++++}-{0:0}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2d07/0x7d10 kernel/locking/lockdep.c:5049 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 percpu_down_read+0x44/0x1a0 include/linux/percpu-rwsem.h:51 ext4_writepages+0x20f/0x2f40 fs/ext4/inode.c:2717 do_writepages+0x3ba/0x640 mm/page-writeback.c:2491 __writeback_single_inode+0x156/0x1160 fs/fs-writeback.c:1622 writeback_single_inode+0x3cb/0x8e0 fs/fs-writeback.c:1743 write_inode_now+0x17f/0x210 fs/fs-writeback.c:2786 iput_final fs/inode.c:1821 [inline] iput+0x613/0x980 fs/inode.c:1860 ext4_xattr_block_set+0x249a/0x32b0 fs/ext4/xattr.c:2093 ext4_xattr_move_to_block fs/ext4/xattr.c:2611 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2686 [inline] ext4_expand_extra_isize_ea+0x120b/0x1dc0 fs/ext4/xattr.c:2774 __ext4_expand_extra_isize+0x301/0x3e0 fs/ext4/inode.c:6003 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6046 [inline] __ext4_mark_inode_dirty+0x47f/0x770 fs/ext4/inode.c:6124 ext4_evict_inode+0xa7f/0x1110 fs/ext4/inode.c:281 evict+0x4c9/0x8d0 fs/inode.c:705 ext4_orphan_cleanup+0xbeb/0x1420 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5574 [inline] ext4_fill_super+0x6ee3/0x78c0 fs/ext4/super.c:5693 get_tree_bdev+0x3f1/0x610 fs/super.c:1366 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x24a/0xa40 fs/namespace.c:3078 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3606 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 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.3.689/6857: #0: ffff888053f0c0e0 (&type->s_umount_key#27/1){+.+.}-{3:3}, at: alloc_super+0x1fa/0x930 fs/super.c:228 #1: ffff888053f0c650 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1891 [inline] #1: ffff888053f0c650 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:2013 [inline] #1: ffff888053f0c650 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x43c/0x1110 fs/ext4/inode.c:242 #2: ffff888073df80c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:165 [inline] #2: ffff888073df80c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6043 [inline] #2: ffff888073df80c8 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x3fe/0x770 fs/ext4/inode.c:6124 stack backtrace: CPU: 0 PID: 6857 Comm: syz.3.689 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 check_noncircular+0x296/0x330 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2d07/0x7d10 kernel/locking/lockdep.c:5049 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 percpu_down_read+0x44/0x1a0 include/linux/percpu-rwsem.h:51 ext4_writepages+0x20f/0x2f40 fs/ext4/inode.c:2717 do_writepages+0x3ba/0x640 mm/page-writeback.c:2491 __writeback_single_inode+0x156/0x1160 fs/fs-writeback.c:1622 writeback_single_inode+0x3cb/0x8e0 fs/fs-writeback.c:1743 write_inode_now+0x17f/0x210 fs/fs-writeback.c:2786 iput_final fs/inode.c:1821 [inline] iput+0x613/0x980 fs/inode.c:1860 ext4_xattr_block_set+0x249a/0x32b0 fs/ext4/xattr.c:2093 ext4_xattr_move_to_block fs/ext4/xattr.c:2611 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2686 [inline] ext4_expand_extra_isize_ea+0x120b/0x1dc0 fs/ext4/xattr.c:2774 __ext4_expand_extra_isize+0x301/0x3e0 fs/ext4/inode.c:6003 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6046 [inline] __ext4_mark_inode_dirty+0x47f/0x770 fs/ext4/inode.c:6124 ext4_evict_inode+0xa7f/0x1110 fs/ext4/inode.c:281 evict+0x4c9/0x8d0 fs/inode.c:705 ext4_orphan_cleanup+0xbeb/0x1420 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5574 [inline] ext4_fill_super+0x6ee3/0x78c0 fs/ext4/super.c:5693 get_tree_bdev+0x3f1/0x610 fs/super.c:1366 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x24a/0xa40 fs/namespace.c:3078 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3606 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fd2d079e0ca 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:00007fd2d1600e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fd2d1600ee0 RCX: 00007fd2d079e0ca RDX: 0000200000000180 RSI: 0000200000000000 RDI: 00007fd2d1600ea0 RBP: 0000200000000180 R08: 00007fd2d1600ee0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000000 R13: 00007fd2d1600ea0 R14: 000000000000047a R15: 000000000000002c EXT4-fs error (device loop3): ext4_xattr_inode_iget:401: inode #11: comm syz.3.689: iget: bad extra_isize 58 (inode size 256) EXT4-fs (loop3): Remounting filesystem read-only EXT4-fs error (device loop3): ext4_xattr_inode_iget:406: comm syz.3.689: error while reading EA inode 11 err=-117 EXT4-fs (loop3): Remounting filesystem read-only EXT4-fs error (device loop3): ext4_xattr_inode_iget:401: inode #11: comm syz.3.689: iget: bad extra_isize 58 (inode size 256) EXT4-fs (loop3): Remounting filesystem read-only EXT4-fs error (device loop3): ext4_xattr_inode_iget:406: comm syz.3.689: error while reading EA inode 11 err=-117 EXT4-fs (loop3): Remounting filesystem read-only EXT4-fs error (device loop3): ext4_xattr_inode_iget:401: inode #18: comm syz.3.689: iget: bad extra_isize 58 (inode size 256) EXT4-fs (loop3): Remounting filesystem read-only EXT4-fs error (device loop3): ext4_xattr_inode_iget:406: comm syz.3.689: error while reading EA inode 18 err=-117 EXT4-fs (loop3): Remounting filesystem read-only EXT4-fs error (device loop3): ext4_xattr_inode_iget:401: inode #18: comm syz.3.689: iget: bad extra_isize 58 (inode size 256) EXT4-fs (loop3): Remounting filesystem read-only EXT4-fs error (device loop3): ext4_xattr_inode_iget:406: comm syz.3.689: error while reading EA inode 18 err=-117 EXT4-fs (loop3): Remounting filesystem read-only EXT4-fs (loop3): 1 orphan inode deleted EXT4-fs (loop3): mounted filesystem without journal. Quota mode: none.