====================================================== WARNING: possible circular locking dependency detected 6.6.0-rc7-syzkaller-g8de1e7afcc1c #0 Not tainted ------------------------------------------------------ syz-executor.1/27769 is trying to acquire lock: ffff80008e3148a8 (bdev_lock){+.+.}-{3:3}, at: bd_prepare_to_claim+0x1a4/0x49c block/bdev.c:508 but task is already holding lock: ffff0000c1526558 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:847 [inline] ffff0000c1526558 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_discard block/ioctl.c:115 [inline] ffff0000c1526558 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x1c60/0x2884 block/ioctl.c:506 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (mapping.invalidate_lock#2){++++}-{3:3}: down_read+0x58/0x2fc kernel/locking/rwsem.c:1520 filemap_invalidate_lock_shared include/linux/fs.h:857 [inline] page_cache_ra_unbounded+0xc8/0x58c mm/readahead.c:225 do_page_cache_ra mm/readahead.c:299 [inline] page_cache_ra_order+0x7fc/0x994 mm/readahead.c:546 ondemand_readahead+0x608/0xafc mm/readahead.c:668 page_cache_sync_ra+0x350/0x3d0 mm/readahead.c:695 page_cache_sync_readahead include/linux/pagemap.h:1293 [inline] ext4_readdir+0xa10/0x3038 fs/ext4/dir.c:194 iterate_dir+0x184/0x468 fs/readdir.c:106 ovl_dir_read+0xd8/0x410 fs/overlayfs/readdir.c:309 ovl_check_d_type_supported+0x9c/0x130 fs/overlayfs/readdir.c:1065 ovl_make_workdir fs/overlayfs/super.c:733 [inline] ovl_get_workdir+0x40c/0x13a0 fs/overlayfs/super.c:874 ovl_fill_super+0xf84/0x2d74 fs/overlayfs/super.c:1419 vfs_get_super fs/super.c:1335 [inline] get_tree_nodev+0xb4/0x144 fs/super.c:1354 ovl_get_tree+0x28/0x38 fs/overlayfs/params.c:615 vfs_get_tree+0x90/0x288 fs/super.c:1750 do_new_mount+0x25c/0x8c8 fs/namespace.c:3335 path_mount+0x590/0xe04 fs/namespace.c:3662 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount fs/namespace.c:3861 [inline] __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3861 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 -> #3 (&type->i_mutex_dir_key#3){++++}-{3:3}: down_read+0x58/0x2fc kernel/locking/rwsem.c:1520 inode_lock_shared include/linux/fs.h:812 [inline] lookup_slow fs/namei.c:1710 [inline] lookup_one_unlocked+0x134/0x254 fs/namei.c:2807 lookup_one_positive_unlocked fs/namei.c:2836 [inline] lookup_positive_unlocked+0x3c/0xa4 fs/namei.c:2876 dquot_quota_on_mount+0x68/0xfc fs/quota/dquot.c:2532 ext4_quota_on_mount fs/ext4/orphan.c:316 [inline] ext4_orphan_cleanup+0x584/0x1134 fs/ext4/orphan.c:444 __ext4_fill_super fs/ext4/super.c:5582 [inline] ext4_fill_super+0x4fa0/0x56ec fs/ext4/super.c:5703 get_tree_bdev+0x33c/0x4a8 fs/super.c:1577 ext4_get_tree+0x28/0x38 fs/ext4/super.c:5735 vfs_get_tree+0x90/0x288 fs/super.c:1750 do_new_mount+0x25c/0x8c8 fs/namespace.c:3335 path_mount+0x590/0xe04 fs/namespace.c:3662 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount fs/namespace.c:3861 [inline] __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3861 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 -> #2 (&type->s_umount_key#29){++++}-{3:3}: down_read+0x58/0x2fc kernel/locking/rwsem.c:1520 __super_lock fs/super.c:58 [inline] super_lock+0x160/0x328 fs/super.c:117 super_lock_shared fs/super.c:146 [inline] super_lock_shared_active fs/super.c:1431 [inline] fs_bdev_sync+0xa4/0x168 fs/super.c:1466 blkdev_flushbuf block/ioctl.c:372 [inline] blkdev_common_ioctl+0x848/0x2884 block/ioctl.c:502 blkdev_ioctl+0x35c/0xae4 block/ioctl.c:624 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:857 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 -> #1 (&bdev->bd_holder_lock){+.+.}-{3:3}: __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799 bd_finish_claiming+0x218/0x3dc block/bdev.c:566 blkdev_get_by_dev+0x3f4/0x55c block/bdev.c:799 setup_bdev_super+0x68/0x51c fs/super.c:1484 mount_bdev+0x1a0/0x2b4 fs/super.c:1626 get_super_block+0x44/0x58 fs/reiserfs/super.c:2601 legacy_get_tree+0xd4/0x16c fs/fs_context.c:662 vfs_get_tree+0x90/0x288 fs/super.c:1750 do_new_mount+0x25c/0x8c8 fs/namespace.c:3335 path_mount+0x590/0xe04 fs/namespace.c:3662 init_mount+0xe4/0x144 fs/init.c:25 do_mount_root+0x104/0x3e4 init/do_mounts.c:166 mount_root_generic+0x1f0/0x594 init/do_mounts.c:205 mount_block_root+0x6c/0x7c init/do_mounts.c:378 mount_root+0xb4/0xe4 init/do_mounts.c:405 prepare_namespace+0xdc/0x11c init/do_mounts.c:489 kernel_init_freeable+0x35c/0x474 init/main.c:1560 kernel_init+0x24/0x29c init/main.c:1437 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:857 -> #0 (bdev_lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3868 [inline] __lock_acquire+0x3370/0x75e8 kernel/locking/lockdep.c:5136 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5753 __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799 bd_prepare_to_claim+0x1a4/0x49c block/bdev.c:508 truncate_bdev_range+0x60/0x27c block/bdev.c:105 blk_ioctl_discard block/ioctl.c:116 [inline] blkdev_common_ioctl+0x1c74/0x2884 block/ioctl.c:506 blkdev_ioctl+0x35c/0xae4 block/ioctl.c:624 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:857 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 other info that might help us debug this: Chain exists of: bdev_lock --> &type->i_mutex_dir_key#3 --> mapping.invalidate_lock#2 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(mapping.invalidate_lock#2); lock(&type->i_mutex_dir_key#3); lock(mapping.invalidate_lock#2); lock(bdev_lock); *** DEADLOCK *** 1 lock held by syz-executor.1/27769: #0: ffff0000c1526558 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:847 [inline] #0: ffff0000c1526558 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_discard block/ioctl.c:115 [inline] #0: ffff0000c1526558 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x1c60/0x2884 block/ioctl.c:506 stack backtrace: CPU: 1 PID: 27769 Comm: syz-executor.1 Not tainted 6.6.0-rc7-syzkaller-g8de1e7afcc1c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 dump_stack+0x1c/0x28 lib/dump_stack.c:113 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2060 check_noncircular+0x310/0x404 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3868 [inline] __lock_acquire+0x3370/0x75e8 kernel/locking/lockdep.c:5136 lock_acquire+0x23c/0x71c kernel/locking/lockdep.c:5753 __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799 bd_prepare_to_claim+0x1a4/0x49c block/bdev.c:508 truncate_bdev_range+0x60/0x27c block/bdev.c:105 blk_ioctl_discard block/ioctl.c:116 [inline] blkdev_common_ioctl+0x1c74/0x2884 block/ioctl.c:506 blkdev_ioctl+0x35c/0xae4 block/ioctl.c:624 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:857 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595