====================================================== WARNING: possible circular locking dependency detected 6.1.83-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/7470 is trying to acquire lock: ffff0000fa036650 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1891 [inline] ffff0000fa036650 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:2013 [inline] ffff0000fa036650 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x408/0x12cc fs/ext4/inode.c:240 but task is already holding lock: ffff0000db50cb98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_ext_migrate+0x234/0xee4 fs/ext4/migrate.c:437 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&sbi->s_writepages_rwsem){++++}-{0:0}: percpu_down_read+0x78/0x304 include/linux/percpu-rwsem.h:51 ext4_writepages+0x18c/0x32b4 fs/ext4/inode.c:2703 do_writepages+0x2e8/0x56c mm/page-writeback.c:2469 filemap_fdatawrite_wbc+0x124/0x174 mm/filemap.c:388 __filemap_fdatawrite_range mm/filemap.c:421 [inline] filemap_write_and_wait_range+0x17c/0x268 mm/filemap.c:674 __iomap_dio_rw+0x864/0x1b34 fs/iomap/direct-io.c:573 iomap_dio_rw+0x5c/0xa8 fs/iomap/direct-io.c:690 ext4_dio_read_iter fs/ext4/file.c:94 [inline] ext4_file_read_iter+0x3a0/0x4d4 fs/ext4/file.c:145 lo_rw_aio+0x91c/0xc84 loop_handle_cmd drivers/block/loop.c:1909 [inline] loop_process_work+0x68c/0x24a4 drivers/block/loop.c:1944 loop_workfn+0x54/0x68 drivers/block/loop.c:1968 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2292 worker_thread+0x8e4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 -> #2 (&sb->s_type->i_mutex_key#9){++++}-{3:3}: down_read+0x64/0x308 kernel/locking/rwsem.c:1520 inode_lock_shared include/linux/fs.h:768 [inline] ext4_bmap+0x58/0x35c fs/ext4/inode.c:3176 bmap+0xa8/0xe8 fs/inode.c:1842 jbd2_journal_bmap fs/jbd2/journal.c:977 [inline] __jbd2_journal_erase fs/jbd2/journal.c:1794 [inline] jbd2_journal_flush+0x4bc/0xa5c fs/jbd2/journal.c:2496 ext4_ioctl_checkpoint fs/ext4/ioctl.c:1086 [inline] __ext4_ioctl fs/ext4/ioctl.c:1594 [inline] ext4_ioctl+0x3834/0x6afc fs/ext4/ioctl.c:1614 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 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 -> #1 (&journal->j_checkpoint_mutex){+.+.}-{3:3}: __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603 mutex_lock_io_nested+0x6c/0x88 kernel/locking/mutex.c:833 __jbd2_log_wait_for_space+0x1a4/0x5cc fs/jbd2/checkpoint.c:71 add_transaction_credits+0x7dc/0xafc fs/jbd2/transaction.c:298 start_this_handle+0x5c4/0x13ac fs/jbd2/transaction.c:422 jbd2__journal_start+0x298/0x544 fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x304/0x6f4 fs/ext4/ext4_jbd2.c:105 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_evict_inode+0x7cc/0x12cc fs/ext4/inode.c:251 evict+0x260/0x68c fs/inode.c:666 iput_final fs/inode.c:1791 [inline] iput+0x7c0/0x8a4 fs/inode.c:1817 do_unlinkat+0x530/0x70c fs/namei.c:4399 __do_sys_unlinkat fs/namei.c:4435 [inline] __se_sys_unlinkat fs/namei.c:4428 [inline] __arm64_sys_unlinkat+0xcc/0xfc fs/namei.c:4428 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 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 (sb_internal){.+.+}-{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+0x3338/0x7680 kernel/locking/lockdep.c:5049 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662 percpu_down_read+0x78/0x304 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+0x408/0x12cc fs/ext4/inode.c:240 evict+0x260/0x68c fs/inode.c:666 iput_final fs/inode.c:1791 [inline] iput+0x7c0/0x8a4 fs/inode.c:1817 ext4_ext_migrate+0xc3c/0xee4 fs/ext4/migrate.c:587 ext4_ioctl_setflags fs/ext4/ioctl.c:695 [inline] ext4_fileattr_set+0xc1c/0x12c8 fs/ext4/ioctl.c:1008 vfs_fileattr_set+0x70c/0xad4 fs/ioctl.c:696 do_vfs_ioctl+0x14cc/0x26f8 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0xe4/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 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: Chain exists of: sb_internal --> &sb->s_type->i_mutex_key#9 --> &sbi->s_writepages_rwsem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sbi->s_writepages_rwsem); lock(&sb->s_type->i_mutex_key#9); lock(&sbi->s_writepages_rwsem); lock(sb_internal); *** DEADLOCK *** 3 locks held by syz-executor.3/7470: #0: ffff0000fa036460 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write_file+0x64/0x1e8 fs/namespace.c:437 #1: ffff0000f1be2c20 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff0000f1be2c20 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: vfs_fileattr_set+0x110/0xad4 fs/ioctl.c:681 #2: ffff0000db50cb98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_ext_migrate+0x234/0xee4 fs/ext4/migrate.c:437 stack backtrace: CPU: 1 PID: 7470 Comm: syz-executor.3 Not tainted 6.1.83-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2048 check_noncircular+0x2cc/0x378 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+0x3338/0x7680 kernel/locking/lockdep.c:5049 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662 percpu_down_read+0x78/0x304 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+0x408/0x12cc fs/ext4/inode.c:240 evict+0x260/0x68c fs/inode.c:666 iput_final fs/inode.c:1791 [inline] iput+0x7c0/0x8a4 fs/inode.c:1817 ext4_ext_migrate+0xc3c/0xee4 fs/ext4/migrate.c:587 ext4_ioctl_setflags fs/ext4/ioctl.c:695 [inline] ext4_fileattr_set+0xc1c/0x12c8 fs/ext4/ioctl.c:1008 vfs_fileattr_set+0x70c/0xad4 fs/ioctl.c:696 do_vfs_ioctl+0x14cc/0x26f8 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0xe4/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 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