EXT4-fs: Warning: mounting with an experimental mount option 'dioread_nolock' for blocksize < PAGE_SIZE ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.3.737/7082 is trying to acquire lock: ffff0000d596eb98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1b8/0x28b4 fs/ext4/inode.c:2715 but task is already holding lock: ffff0000f6286518 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:165 [inline] ffff0000f6286518 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6020 [inline] ffff0000f6286518 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x37c/0x784 fs/ext4/inode.c:6101 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ei->xattr_sem){++++}-{3:3}: down_write+0x5c/0x88 kernel/locking/rwsem.c:1573 ext4_write_lock_xattr fs/ext4/xattr.h:158 [inline] ext4_destroy_inline_data+0x30/0x114 fs/ext4/inline.c:1922 ext4_writepages+0x430/0x28b4 fs/ext4/inode.c:2761 do_writepages+0x2b0/0x504 mm/page-writeback.c:2491 filemap_fdatawrite_wbc+0x124/0x174 mm/filemap.c:388 __filemap_fdatawrite_range mm/filemap.c:421 [inline] file_write_and_wait_range+0x11c/0x1f4 mm/filemap.c:774 ext4_sync_file+0x210/0xc70 fs/ext4/fsync.c:151 vfs_fsync_range+0x168/0x188 fs/sync.c:188 generic_write_sync include/linux/fs.h:2962 [inline] ext4_buffered_write_iter+0x47c/0x528 fs/ext4/file.c:292 ext4_file_write_iter+0x18c/0x1574 fs/ext4/file.c:-1 do_iter_readv_writev fs/read_write.c:-1 [inline] do_iter_write+0x53c/0x940 fs/read_write.c:861 vfs_writev fs/read_write.c:934 [inline] do_pwritev+0x1e8/0x338 fs/read_write.c:1031 __do_sys_pwritev2 fs/read_write.c:1090 [inline] __se_sys_pwritev2 fs/read_write.c:1081 [inline] __arm64_sys_pwritev2+0xd4/0x108 fs/read_write.c:1081 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #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+0x2880/0x6800 kernel/locking/lockdep.c:5049 lock_acquire+0x20c/0x63c kernel/locking/lockdep.c:5662 percpu_down_read+0x70/0x2a8 include/linux/percpu-rwsem.h:51 ext4_writepages+0x1b8/0x28b4 fs/ext4/inode.c:2715 do_writepages+0x2b0/0x504 mm/page-writeback.c:2491 __writeback_single_inode+0x164/0x1554 fs/fs-writeback.c:1622 writeback_single_inode+0x1cc/0x740 fs/fs-writeback.c:1743 write_inode_now+0x150/0x1cc fs/fs-writeback.c:2786 iput_final fs/inode.c:1821 [inline] iput+0x5bc/0x7e4 fs/inode.c:1860 ext4_xattr_block_set+0x1454/0x2880 fs/ext4/xattr.c:2146 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+0xe5c/0x17ac fs/ext4/xattr.c:2774 __ext4_expand_extra_isize+0x298/0x358 fs/ext4/inode.c:5980 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6023 [inline] __ext4_mark_inode_dirty+0x3e4/0x784 fs/ext4/inode.c:6101 ext4_evict_inode+0xb64/0x1278 fs/ext4/inode.c:279 evict+0x3e0/0x828 fs/inode.c:705 iput_final fs/inode.c:1834 [inline] iput+0x754/0x7e4 fs/inode.c:1860 ext4_process_orphan+0x240/0x2b4 fs/ext4/orphan.c:358 ext4_orphan_cleanup+0x920/0x1060 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5556 [inline] ext4_fill_super+0x6188/0x660c fs/ext4/super.c:5687 get_tree_bdev+0x358/0x544 fs/super.c:1366 ext4_get_tree+0x28/0x38 fs/ext4/super.c:5717 vfs_get_tree+0x90/0x274 fs/super.c:1573 do_new_mount+0x228/0x810 fs/namespace.c:3078 path_mount+0x5bc/0xe80 fs/namespace.c:3408 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount fs/namespace.c:3606 [inline] __arm64_sys_mount+0x49c/0x59c fs/namespace.c:3606 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->xattr_sem); lock(&sbi->s_writepages_rwsem); lock(&ei->xattr_sem); lock(&sbi->s_writepages_rwsem); *** DEADLOCK *** 3 locks held by syz.3.737/7082: #0: ffff0000d596c0e0 (&type->s_umount_key#26/1){+.+.}-{3:3}, at: alloc_super+0x1a4/0x800 fs/super.c:228 #1: ffff0000d596c650 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1891 [inline] #1: ffff0000d596c650 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:2013 [inline] #1: ffff0000d596c650 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x3e0/0x1278 fs/ext4/inode.c:240 #2: ffff0000f6286518 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:165 [inline] #2: ffff0000f6286518 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6020 [inline] #2: ffff0000f6286518 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x37c/0x784 fs/ext4/inode.c:6101 stack backtrace: CPU: 1 PID: 7082 Comm: syz.3.737 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026 Call trace: dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2048 check_noncircular+0x264/0x2f8 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+0x2880/0x6800 kernel/locking/lockdep.c:5049 lock_acquire+0x20c/0x63c kernel/locking/lockdep.c:5662 percpu_down_read+0x70/0x2a8 include/linux/percpu-rwsem.h:51 ext4_writepages+0x1b8/0x28b4 fs/ext4/inode.c:2715 do_writepages+0x2b0/0x504 mm/page-writeback.c:2491 __writeback_single_inode+0x164/0x1554 fs/fs-writeback.c:1622 writeback_single_inode+0x1cc/0x740 fs/fs-writeback.c:1743 write_inode_now+0x150/0x1cc fs/fs-writeback.c:2786 iput_final fs/inode.c:1821 [inline] iput+0x5bc/0x7e4 fs/inode.c:1860 ext4_xattr_block_set+0x1454/0x2880 fs/ext4/xattr.c:2146 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+0xe5c/0x17ac fs/ext4/xattr.c:2774 __ext4_expand_extra_isize+0x298/0x358 fs/ext4/inode.c:5980 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6023 [inline] __ext4_mark_inode_dirty+0x3e4/0x784 fs/ext4/inode.c:6101 ext4_evict_inode+0xb64/0x1278 fs/ext4/inode.c:279 evict+0x3e0/0x828 fs/inode.c:705 iput_final fs/inode.c:1834 [inline] iput+0x754/0x7e4 fs/inode.c:1860 ext4_process_orphan+0x240/0x2b4 fs/ext4/orphan.c:358 ext4_orphan_cleanup+0x920/0x1060 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5556 [inline] ext4_fill_super+0x6188/0x660c fs/ext4/super.c:5687 get_tree_bdev+0x358/0x544 fs/super.c:1366 ext4_get_tree+0x28/0x38 fs/ext4/super.c:5717 vfs_get_tree+0x90/0x274 fs/super.c:1573 do_new_mount+0x228/0x810 fs/namespace.c:3078 path_mount+0x5bc/0xe80 fs/namespace.c:3408 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount fs/namespace.c:3606 [inline] __arm64_sys_mount+0x49c/0x59c fs/namespace.c:3606 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 ------------[ cut here ]------------ EA inode 11 i_nlink=0 WARNING: CPU: 0 PID: 7082 at fs/ext4/xattr.c:1006 ext4_xattr_inode_update_ref+0x474/0x4b8 fs/ext4/xattr.c:1004 Modules linked in: CPU: 0 PID: 7082 Comm: syz.3.737 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026 pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : ext4_xattr_inode_update_ref+0x474/0x4b8 fs/ext4/xattr.c:1004 lr : ext4_xattr_inode_update_ref+0x474/0x4b8 fs/ext4/xattr.c:1004 sp : ffff800021e86dc0 x29: ffff800021e86e70 x28: 0000000000000000 x27: dfff800000000000 x26: ffff800021e86de0 x25: ffff7000043d0dbc x24: 0000000000000000 x23: ffff800017bea000 x22: ffff0000d8629700 x21: 0000000000000000 x20: 0000000000000001 x19: ffff0000d86296c0 x18: ffff800011b9bf60 x17: 0000000000000000 x16: ffff80000804309c x15: 0000000000000002 x14: 0000000000000001 x13: 1ffff000043d0d08 x12: 0000000000080000 x11: 000000000007af2e x10: ffff80002a493000 x9 : 00b7f1debb242f00 x8 : 00b7f1debb242f00 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800021e86858 x4 : ffff800015304cc0 x3 : ffff800008319678 x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000000 Call trace: ext4_xattr_inode_update_ref+0x474/0x4b8 fs/ext4/xattr.c:1004 ext4_xattr_inode_dec_ref fs/ext4/xattr.c:1029 [inline] ext4_xattr_set_entry+0x918/0x15a0 fs/ext4/xattr.c:1671 ext4_xattr_ibody_set+0x204/0x5f8 fs/ext4/xattr.c:2215 ext4_xattr_move_to_block fs/ext4/xattr.c:2618 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2686 [inline] ext4_expand_extra_isize_ea+0xea4/0x17ac fs/ext4/xattr.c:2774 __ext4_expand_extra_isize+0x298/0x358 fs/ext4/inode.c:5980 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6023 [inline] __ext4_mark_inode_dirty+0x3e4/0x784 fs/ext4/inode.c:6101 ext4_evict_inode+0xb64/0x1278 fs/ext4/inode.c:279 evict+0x3e0/0x828 fs/inode.c:705 iput_final fs/inode.c:1834 [inline] iput+0x754/0x7e4 fs/inode.c:1860 ext4_process_orphan+0x240/0x2b4 fs/ext4/orphan.c:358 ext4_orphan_cleanup+0x920/0x1060 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5556 [inline] ext4_fill_super+0x6188/0x660c fs/ext4/super.c:5687 get_tree_bdev+0x358/0x544 fs/super.c:1366 ext4_get_tree+0x28/0x38 fs/ext4/super.c:5717 vfs_get_tree+0x90/0x274 fs/super.c:1573 do_new_mount+0x228/0x810 fs/namespace.c:3078 path_mount+0x5bc/0xe80 fs/namespace.c:3408 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount fs/namespace.c:3606 [inline] __arm64_sys_mount+0x49c/0x59c fs/namespace.c:3606 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 irq event stamp: 3487 hardirqs last enabled at (3487): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (3487): [] _raw_spin_unlock_irqrestore+0x48/0xac kernel/locking/spinlock.c:194 hardirqs last disabled at (3486): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (3486): [] _raw_spin_lock_irqsave+0xa4/0xb0 kernel/locking/spinlock.c:162 softirqs last enabled at (2598): [] softirq_handle_end kernel/softirq.c:439 [inline] softirqs last enabled at (2598): [] handle_softirqs+0xaec/0xc60 kernel/softirq.c:624 softirqs last disabled at (2537): [] __do_softirq+0x14/0x20 kernel/softirq.c:630 ---[ end trace 0000000000000000 ]--- EXT4-fs error (device loop3): ext4_free_inode:355: comm syz.3.737: bit already cleared for inode 11 EXT4-fs error (device loop3) in ext4_free_inode:362: Corrupt filesystem EXT4-fs error (device loop3) in ext4_free_inode:362: Corrupt filesystem EXT4-fs (loop3): 1 orphan inode deleted EXT4-fs (loop3): mounted filesystem without journal. Quota mode: writeback. EXT4-fs warning (device loop3): ext4_resize_begin:84: There are errors in the filesystem, so online resizing is not allowed