loop2: detected capacity change from 0 to 512 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.2.302/7749 is trying to acquire lock: ffff0000d3d42b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: percpu_down_read include/linux/percpu-rwsem.h:77 [inline] ffff0000d3d42b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages_down_read fs/ext4/ext4.h:1786 [inline] ffff0000d3d42b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x150/0x2a0 fs/ext4/inode.c:3024 but task is already holding lock: ffff0000dd71f388 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline] ffff0000dd71f388 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6425 [inline] ffff0000dd71f388 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x358/0x6fc fs/ext4/inode.c:6506 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&ei->xattr_sem){++++}-{4:4}: down_write+0x50/0xc0 kernel/locking/rwsem.c:1590 ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline] ext4_xattr_set_handle+0x11c/0x1260 fs/ext4/xattr.c:2362 ext4_initxattrs+0xa4/0x11c fs/ext4/xattr_security.c:44 security_inode_init_security+0x6dc/0x7f4 security/security.c:1852 ext4_init_security+0x44/0x58 fs/ext4/xattr_security.c:58 __ext4_new_inode+0x27f4/0x3190 fs/ext4/ialloc.c:1325 ext4_create+0x1f8/0x3fc fs/ext4/namei.c:2822 lookup_open fs/namei.c:3708 [inline] open_last_lookups fs/namei.c:3807 [inline] path_openat+0x12d8/0x2c40 fs/namei.c:4043 do_filp_open+0x18c/0x36c fs/namei.c:4073 do_sys_openat2+0x11c/0x1b4 fs/open.c:1435 do_sys_open fs/open.c:1450 [inline] __do_sys_openat fs/open.c:1466 [inline] __se_sys_openat fs/open.c:1461 [inline] __arm64_sys_openat+0x120/0x158 fs/open.c:1461 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 -> #1 (jbd2_handle){++++}-{0:0}: start_this_handle+0xe74/0x10dc fs/jbd2/transaction.c:444 jbd2__journal_start+0x288/0x51c fs/jbd2/transaction.c:501 __ext4_journal_start_sb+0x378/0x88c fs/ext4/ext4_jbd2.c:115 __ext4_journal_start fs/ext4/ext4_jbd2.h:242 [inline] ext4_do_writepages+0xb94/0x39b4 fs/ext4/inode.c:2913 ext4_writepages+0x178/0x2a0 fs/ext4/inode.c:3025 do_writepages+0x270/0x468 mm/page-writeback.c:2634 filemap_fdatawrite_wbc mm/filemap.c:386 [inline] __filemap_fdatawrite_range mm/filemap.c:419 [inline] file_write_and_wait_range+0x1d0/0x2c4 mm/filemap.c:794 ext4_sync_file+0x274/0xb44 fs/ext4/fsync.c:154 vfs_fsync_range fs/sync.c:187 [inline] vfs_fsync fs/sync.c:201 [inline] do_fsync fs/sync.c:212 [inline] __do_sys_fsync fs/sync.c:217 [inline] __se_sys_fsync fs/sync.c:215 [inline] __arm64_sys_fsync+0x170/0x1d4 fs/sync.c:215 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 -> #0 (&sbi->s_writepages_rwsem){++++}-{0:0}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x1774/0x30a4 kernel/locking/lockdep.c:5237 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868 percpu_down_read_internal+0x5c/0x298 include/linux/percpu-rwsem.h:53 percpu_down_read include/linux/percpu-rwsem.h:77 [inline] ext4_writepages_down_read fs/ext4/ext4.h:1786 [inline] ext4_writepages+0x150/0x2a0 fs/ext4/inode.c:3024 do_writepages+0x270/0x468 mm/page-writeback.c:2634 __writeback_single_inode+0x15c/0x13e8 fs/fs-writeback.c:1680 writeback_single_inode+0x18c/0x54c fs/fs-writeback.c:1801 write_inode_now+0x13c/0x1a4 fs/fs-writeback.c:2864 iput_final fs/inode.c:1884 [inline] iput+0x570/0x83c fs/inode.c:1923 ext4_xattr_block_set+0x13dc/0x24bc fs/ext4/xattr.c:2194 ext4_xattr_move_to_block fs/ext4/xattr.c:2659 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2734 [inline] ext4_expand_extra_isize_ea+0xeb4/0x182c fs/ext4/xattr.c:2822 __ext4_expand_extra_isize+0x2a0/0x37c fs/ext4/inode.c:6385 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6428 [inline] __ext4_mark_inode_dirty+0x3c0/0x6fc fs/ext4/inode.c:6506 ext4_evict_inode+0x930/0x1084 fs/ext4/inode.c:254 evict+0x414/0x928 fs/inode.c:810 iput_final fs/inode.c:1897 [inline] iput+0x6e4/0x83c fs/inode.c:1923 ext4_process_orphan+0x240/0x2b4 fs/ext4/orphan.c:360 ext4_orphan_cleanup+0x930/0x107c fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5609 [inline] ext4_fill_super+0x4724/0x4ea4 fs/ext4/super.c:5728 get_tree_bdev_flags+0x360/0x414 fs/super.c:1692 get_tree_bdev+0x2c/0x3c fs/super.c:1715 ext4_get_tree+0x28/0x38 fs/ext4/super.c:5760 vfs_get_tree+0x90/0x28c fs/super.c:1815 do_new_mount+0x278/0x7f4 fs/namespace.c:3808 path_mount+0x5b4/0xde0 fs/namespace.c:4123 do_mount fs/namespace.c:4136 [inline] __do_sys_mount fs/namespace.c:4347 [inline] __se_sys_mount fs/namespace.c:4324 [inline] __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4324 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 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.2.302/7749: #0: ffff0000d41080e0 (&type->s_umount_key#26/1){+.+.}-{4:4}, at: alloc_super+0x1a0/0x80c fs/super.c:345 #1: ffff0000d4108618 (sb_internal){.+.+}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline] #1: ffff0000d4108618 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1798 [inline] #1: ffff0000d4108618 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1981 [inline] #1: ffff0000d4108618 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x2b0/0x1084 fs/ext4/inode.c:215 #2: ffff0000dd71f388 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline] #2: ffff0000dd71f388 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6425 [inline] #2: ffff0000dd71f388 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x358/0x6fc fs/ext4/inode.c:6506 stack backtrace: CPU: 1 UID: 0 PID: 7749 Comm: syz.2.302 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 print_circular_bug+0x324/0x32c kernel/locking/lockdep.c:2043 check_noncircular+0x154/0x174 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x1774/0x30a4 kernel/locking/lockdep.c:5237 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868 percpu_down_read_internal+0x5c/0x298 include/linux/percpu-rwsem.h:53 percpu_down_read include/linux/percpu-rwsem.h:77 [inline] ext4_writepages_down_read fs/ext4/ext4.h:1786 [inline] ext4_writepages+0x150/0x2a0 fs/ext4/inode.c:3024 do_writepages+0x270/0x468 mm/page-writeback.c:2634 __writeback_single_inode+0x15c/0x13e8 fs/fs-writeback.c:1680 writeback_single_inode+0x18c/0x54c fs/fs-writeback.c:1801 write_inode_now+0x13c/0x1a4 fs/fs-writeback.c:2864 iput_final fs/inode.c:1884 [inline] iput+0x570/0x83c fs/inode.c:1923 ext4_xattr_block_set+0x13dc/0x24bc fs/ext4/xattr.c:2194 ext4_xattr_move_to_block fs/ext4/xattr.c:2659 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2734 [inline] ext4_expand_extra_isize_ea+0xeb4/0x182c fs/ext4/xattr.c:2822 __ext4_expand_extra_isize+0x2a0/0x37c fs/ext4/inode.c:6385 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6428 [inline] __ext4_mark_inode_dirty+0x3c0/0x6fc fs/ext4/inode.c:6506 ext4_evict_inode+0x930/0x1084 fs/ext4/inode.c:254 evict+0x414/0x928 fs/inode.c:810 iput_final fs/inode.c:1897 [inline] iput+0x6e4/0x83c fs/inode.c:1923 ext4_process_orphan+0x240/0x2b4 fs/ext4/orphan.c:360 ext4_orphan_cleanup+0x930/0x107c fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5609 [inline] ext4_fill_super+0x4724/0x4ea4 fs/ext4/super.c:5728 get_tree_bdev_flags+0x360/0x414 fs/super.c:1692 get_tree_bdev+0x2c/0x3c fs/super.c:1715 ext4_get_tree+0x28/0x38 fs/ext4/super.c:5760 vfs_get_tree+0x90/0x28c fs/super.c:1815 do_new_mount+0x278/0x7f4 fs/namespace.c:3808 path_mount+0x5b4/0xde0 fs/namespace.c:4123 do_mount fs/namespace.c:4136 [inline] __do_sys_mount fs/namespace.c:4347 [inline] __se_sys_mount fs/namespace.c:4324 [inline] __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4324 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 ------------[ cut here ]------------ EA inode 11 i_nlink=2 WARNING: CPU: 1 PID: 7749 at fs/ext4/xattr.c:1053 ext4_xattr_inode_update_ref+0x444/0x488 fs/ext4/xattr.c:1051 Modules linked in: CPU: 1 UID: 0 PID: 7749 Comm: syz.2.302 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025 pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : ext4_xattr_inode_update_ref+0x444/0x488 fs/ext4/xattr.c:1051 lr : ext4_xattr_inode_update_ref+0x444/0x488 fs/ext4/xattr.c:1051 sp : ffff8000a4926dc0 x29: ffff8000a4926e50 x28: 0000000000000000 x27: 1fffe0001bae3091 x26: dfff800000000000 x25: ffff8000a4926dc0 x24: ffff700014924db8 x23: ffff800092e12000 x22: ffff0000dd7182d8 x21: 0000000000000002 x20: 0000000000000001 x19: ffff0000dd718298 x18: 1fffe0003379be88 x17: ffff80008f7de000 x16: ffff80008b0141e8 x15: 0000000000000001 x14: 1fffe0003379e908 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000080000 x10: 0000000000000003 x9 : 4e53112eb17eac00 x8 : 4e53112eb17eac00 x7 : 0000000000000000 x6 : ffff800080491290 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000010 x2 : ffff8000a4926980 x1 : ffff80008b668440 x0 : 0000000000000001 Call trace: ext4_xattr_inode_update_ref+0x444/0x488 fs/ext4/xattr.c:1051 (P) ext4_xattr_inode_dec_ref fs/ext4/xattr.c:1076 [inline] ext4_xattr_set_entry+0x928/0x15c0 fs/ext4/xattr.c:1714 ext4_xattr_ibody_set+0x204/0x5fc fs/ext4/xattr.c:2263 ext4_xattr_move_to_block fs/ext4/xattr.c:2666 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2734 [inline] ext4_expand_extra_isize_ea+0xefc/0x182c fs/ext4/xattr.c:2822 __ext4_expand_extra_isize+0x2a0/0x37c fs/ext4/inode.c:6385 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6428 [inline] __ext4_mark_inode_dirty+0x3c0/0x6fc fs/ext4/inode.c:6506 ext4_evict_inode+0x930/0x1084 fs/ext4/inode.c:254 evict+0x414/0x928 fs/inode.c:810 iput_final fs/inode.c:1897 [inline] iput+0x6e4/0x83c fs/inode.c:1923 ext4_process_orphan+0x240/0x2b4 fs/ext4/orphan.c:360 ext4_orphan_cleanup+0x930/0x107c fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5609 [inline] ext4_fill_super+0x4724/0x4ea4 fs/ext4/super.c:5728 get_tree_bdev_flags+0x360/0x414 fs/super.c:1692 get_tree_bdev+0x2c/0x3c fs/super.c:1715 ext4_get_tree+0x28/0x38 fs/ext4/super.c:5760 vfs_get_tree+0x90/0x28c fs/super.c:1815 do_new_mount+0x278/0x7f4 fs/namespace.c:3808 path_mount+0x5b4/0xde0 fs/namespace.c:4123 do_mount fs/namespace.c:4136 [inline] __do_sys_mount fs/namespace.c:4347 [inline] __se_sys_mount fs/namespace.c:4324 [inline] __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4324 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 irq event stamp: 2305 hardirqs last enabled at (2305): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (2305): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (2304): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (2304): [] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:162 softirqs last enabled at (1646): [] softirq_handle_end kernel/softirq.c:425 [inline] softirqs last enabled at (1646): [] handle_softirqs+0xaf8/0xc88 kernel/softirq.c:607 softirqs last disabled at (1517): [] __do_softirq+0x14/0x20 kernel/softirq.c:613 ---[ end trace 0000000000000000 ]--- EXT4-fs (loop2): 1 orphan inode deleted EXT4-fs (loop2): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.