loop7: detected capacity change from 0 to 8192 ====================================================== WARNING: possible circular locking dependency detected 6.13.0-rc3-syzkaller-00136-g8faabc041a00 #0 Not tainted ------------------------------------------------------ syz.7.3157/17605 is trying to acquire lock: ffff88805b752838 (&sb->s_type->i_mutex_key#21){++++}-{4:4}, at: inode_lock include/linux/fs.h:818 [inline] ffff88805b752838 (&sb->s_type->i_mutex_key#21){++++}-{4:4}, at: __generic_file_fsync+0xb0/0x1f0 fs/libfs.c:1536 but task is already holding lock: ffff888142bd7608 (&q->q_usage_counter(io)#26){++++}-{0:0}, at: loop_set_status+0x1d9/0x700 drivers/block/loop.c:1267 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&q->q_usage_counter(io)#26){++++}-{0:0}: bio_queue_enter block/blk.h:75 [inline] blk_mq_submit_bio+0x1fb6/0x24c0 block/blk-mq.c:3090 __submit_bio+0x384/0x540 block/blk-core.c:629 __submit_bio_noacct_mq block/blk-core.c:710 [inline] submit_bio_noacct_nocheck+0x698/0xd70 block/blk-core.c:739 submit_bio_noacct+0x93a/0x1e20 block/blk-core.c:868 ocfs2_read_blocks+0x59c/0x1530 fs/ocfs2/buffer_head_io.c:330 ocfs2_read_inode_block_full fs/ocfs2/inode.c:1593 [inline] ocfs2_read_inode_block+0xc6/0x170 fs/ocfs2/inode.c:1605 ocfs2_get_clusters+0x22b/0xc40 fs/ocfs2/extent_map.c:615 ocfs2_extent_map_get_blocks+0x1ac/0x640 fs/ocfs2/extent_map.c:668 ocfs2_read_virt_blocks+0x284/0x9c0 fs/ocfs2/extent_map.c:983 ocfs2_read_dir_block+0xb6/0x520 fs/ocfs2/dir.c:508 ocfs2_find_entry_el fs/ocfs2/dir.c:715 [inline] ocfs2_find_entry+0xc3a/0x17b0 fs/ocfs2/dir.c:1080 ocfs2_find_files_on_disk fs/ocfs2/dir.c:1981 [inline] ocfs2_lookup_ino_from_name+0xd5/0x1e0 fs/ocfs2/dir.c:2003 _ocfs2_get_system_file_inode fs/ocfs2/sysfile.c:136 [inline] ocfs2_get_system_file_inode+0x443/0x940 fs/ocfs2/sysfile.c:112 ocfs2_init_global_system_inodes fs/ocfs2/super.c:457 [inline] ocfs2_initialize_super.isra.0+0x1f3a/0x32e0 fs/ocfs2/super.c:2248 ocfs2_fill_super+0xb10/0x41d0 fs/ocfs2/super.c:994 mount_bdev+0x1e6/0x2d0 fs/super.c:1693 legacy_get_tree+0x10c/0x220 fs/fs_context.c:662 vfs_get_tree+0x92/0x380 fs/super.c:1814 do_new_mount fs/namespace.c:3507 [inline] path_mount+0x14e6/0x1f20 fs/namespace.c:3834 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount fs/namespace.c:4034 [inline] __x64_sys_mount+0x294/0x320 fs/namespace.c:4034 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (&oi->ip_io_mutex){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19b/0xa60 kernel/locking/mutex.c:735 ocfs2_read_blocks+0x226/0x1530 fs/ocfs2/buffer_head_io.c:233 ocfs2_read_inode_block_full fs/ocfs2/inode.c:1593 [inline] ocfs2_read_inode_block+0xc6/0x170 fs/ocfs2/inode.c:1605 ocfs2_assign_bh fs/ocfs2/dlmglue.c:2414 [inline] ocfs2_inode_lock_full_nested+0xeb5/0x1f20 fs/ocfs2/dlmglue.c:2509 ocfs2_inode_lock_atime+0x24a/0x3c0 fs/ocfs2/dlmglue.c:2597 ocfs2_mmap+0xd1/0x280 fs/ocfs2/mmap.c:166 call_mmap include/linux/fs.h:2183 [inline] mmap_file mm/internal.h:124 [inline] __mmap_new_file_vma mm/vma.c:2291 [inline] __mmap_new_vma mm/vma.c:2355 [inline] __mmap_region+0x1789/0x2670 mm/vma.c:2456 mmap_region+0x270/0x320 mm/mmap.c:1348 do_mmap+0xc00/0xfc0 mm/mmap.c:496 vm_mmap_pgoff+0x1ba/0x360 mm/util.c:580 ksys_mmap_pgoff+0x32c/0x5c0 mm/mmap.c:542 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline] __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&mm->mmap_lock){++++}-{4:4}: gup_fast_fallback+0x11f8/0x2690 mm/gup.c:3416 pin_user_pages_fast+0xa8/0x100 mm/gup.c:3540 iov_iter_extract_user_pages lib/iov_iter.c:1844 [inline] iov_iter_extract_pages+0x3a5/0x2010 lib/iov_iter.c:1907 dio_refill_pages fs/direct-io.c:172 [inline] dio_get_page fs/direct-io.c:213 [inline] do_direct_IO fs/direct-io.c:915 [inline] __blockdev_direct_IO+0x2ec5/0x40b0 fs/direct-io.c:1243 blockdev_direct_IO include/linux/fs.h:3313 [inline] fat_direct_IO+0x1df/0x390 fs/fat/inode.c:281 generic_file_read_iter+0x1d7/0x450 mm/filemap.c:2811 aio_read+0x316/0x4e0 fs/aio.c:1602 __io_submit_one fs/aio.c:2003 [inline] io_submit_one+0x1580/0x1da0 fs/aio.c:2052 __do_sys_io_submit fs/aio.c:2111 [inline] __se_sys_io_submit fs/aio.c:2081 [inline] __x64_sys_io_submit+0x1b2/0x340 fs/aio.c:2081 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&sb->s_type->i_mutex_key#21){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849 down_write+0x93/0x200 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:818 [inline] __generic_file_fsync+0xb0/0x1f0 fs/libfs.c:1536 fat_file_fsync+0x70/0x210 fs/fat/file.c:191 vfs_fsync_range fs/sync.c:187 [inline] vfs_fsync+0x12d/0x1f0 fs/sync.c:201 __loop_update_dio+0x182/0x570 drivers/block/loop.c:204 loop_set_status+0x2a4/0x700 drivers/block/loop.c:1289 loop_set_status_old+0x163/0x1d0 drivers/block/loop.c:1388 lo_ioctl+0x65c/0x18b0 drivers/block/loop.c:1541 blkdev_ioctl+0x279/0x6d0 block/ioctl.c:693 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &sb->s_type->i_mutex_key#21 --> &oi->ip_io_mutex --> &q->q_usage_counter(io)#26 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&q->q_usage_counter(io)#26); lock(&oi->ip_io_mutex); lock(&q->q_usage_counter(io)#26); lock(&sb->s_type->i_mutex_key#21); *** DEADLOCK *** 3 locks held by syz.7.3157/17605: #0: ffff888025a27360 (&lo->lo_mutex){+.+.}-{4:4}, at: loop_set_status+0x2a/0x700 drivers/block/loop.c:1251 #1: ffff888142bd7608 (&q->q_usage_counter(io)#26){++++}-{0:0}, at: loop_set_status+0x1d9/0x700 drivers/block/loop.c:1267 #2: ffff888142bd7640 (&q->q_usage_counter(queue)#10){+.+.}-{0:0}, at: loop_set_status+0x1d9/0x700 drivers/block/loop.c:1267 stack backtrace: CPU: 0 UID: 0 PID: 17605 Comm: syz.7.3157 Not tainted 6.13.0-rc3-syzkaller-00136-g8faabc041a00 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x419/0x5d0 kernel/locking/lockdep.c:2074 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849 down_write+0x93/0x200 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:818 [inline] __generic_file_fsync+0xb0/0x1f0 fs/libfs.c:1536 fat_file_fsync+0x70/0x210 fs/fat/file.c:191 vfs_fsync_range fs/sync.c:187 [inline] vfs_fsync+0x12d/0x1f0 fs/sync.c:201 __loop_update_dio+0x182/0x570 drivers/block/loop.c:204 loop_set_status+0x2a4/0x700 drivers/block/loop.c:1289 loop_set_status_old+0x163/0x1d0 drivers/block/loop.c:1388 lo_ioctl+0x65c/0x18b0 drivers/block/loop.c:1541 blkdev_ioctl+0x279/0x6d0 block/ioctl.c:693 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f32d4d85d29 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f32d5bbd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f32d4f75fa0 RCX: 00007f32d4d85d29 RDX: 0000000020000480 RSI: 0000000000004c02 RDI: 0000000000000004 RBP: 00007f32d4e01aa8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f32d4f75fa0 R15: 00007fffc825e128