====================================================== WARNING: possible circular locking dependency detected 5.15.185-syzkaller #0 Not tainted ------------------------------------------------------ syz.0.506/6591 is trying to acquire lock: ffff0000d836d488 (&osb->system_file_mutex){+.+.}-{3:3}, at: ocfs2_get_system_file_inode+0x15c/0x5ec fs/ocfs2/sysfile.c:101 but task is already holding lock: ffff0000de1e22e0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_write_begin+0x190/0x30c fs/ocfs2/aops.c:1903 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}: down_read+0xc0/0x390 kernel/locking/rwsem.c:1498 ocfs2_read_virt_blocks+0x228/0x858 fs/ocfs2/extent_map.c:976 ocfs2_read_dir_block fs/ocfs2/dir.c:508 [inline] ocfs2_find_entry_el fs/ocfs2/dir.c:715 [inline] ocfs2_find_entry+0x314/0x1b84 fs/ocfs2/dir.c:1091 ocfs2_find_files_on_disk+0x10c/0x388 fs/ocfs2/dir.c:1995 ocfs2_lookup_ino_from_name+0x60/0x114 fs/ocfs2/dir.c:2017 _ocfs2_get_system_file_inode fs/ocfs2/sysfile.c:136 [inline] ocfs2_get_system_file_inode+0x288/0x5ec fs/ocfs2/sysfile.c:112 ocfs2_init_global_system_inodes+0x2a8/0x594 fs/ocfs2/super.c:458 ocfs2_initialize_super fs/ocfs2/super.c:2279 [inline] ocfs2_fill_super+0x3128/0x4074 fs/ocfs2/super.c:995 mount_bdev+0x264/0x358 fs/super.c:1400 ocfs2_mount+0x44/0x58 fs/ocfs2/super.c:1187 legacy_get_tree+0xd4/0x16c fs/fs_context.c:611 vfs_get_tree+0x90/0x274 fs/super.c:1530 do_new_mount+0x228/0x810 fs/namespace.c:3010 path_mount+0x5b4/0x1000 fs/namespace.c:3340 do_mount fs/namespace.c:3353 [inline] __do_sys_mount fs/namespace.c:3561 [inline] __se_sys_mount fs/namespace.c:3538 [inline] __arm64_sys_mount+0x514/0x5e4 fs/namespace.c:3538 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 -> #0 (&osb->system_file_mutex){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2928/0x651c kernel/locking/lockdep.c:5012 lock_acquire+0x1f4/0x620 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x194/0x1edc kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0xac/0x11c kernel/locking/mutex.c:743 ocfs2_get_system_file_inode+0x15c/0x5ec fs/ocfs2/sysfile.c:101 ocfs2_reserve_suballoc_bits+0x11c/0x3a68 fs/ocfs2/suballoc.c:776 ocfs2_reserve_cluster_bitmap_bits fs/ocfs2/suballoc.c:1128 [inline] ocfs2_reserve_clusters_with_limit+0x290/0x9e0 fs/ocfs2/suballoc.c:1173 ocfs2_reserve_clusters fs/ocfs2/suballoc.c:1223 [inline] ocfs2_lock_allocators+0x27c/0x518 fs/ocfs2/suballoc.c:2669 ocfs2_write_begin_nolock+0x1e88/0x3764 fs/ocfs2/aops.c:1741 ocfs2_write_begin+0x1b4/0x30c fs/ocfs2/aops.c:1905 generic_perform_write+0x204/0x480 mm/filemap.c:3785 __generic_file_write_iter+0x23c/0x454 mm/filemap.c:3912 ocfs2_file_write_iter+0x12e0/0x1b84 fs/ocfs2/file.c:2472 do_iter_readv_writev+0x3a0/0x4f8 fs/read_write.c:-1 do_iter_write+0x1c4/0x670 fs/read_write.c:855 vfs_writev fs/read_write.c:928 [inline] do_pwritev+0x1c8/0x2fc fs/read_write.c:1025 __do_sys_pwritev2 fs/read_write.c:1084 [inline] __se_sys_pwritev2 fs/read_write.c:1075 [inline] __arm64_sys_pwritev2+0xd4/0x108 fs/read_write.c:1075 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ocfs2_file_ip_alloc_sem_key); lock(&osb->system_file_mutex); lock(&ocfs2_file_ip_alloc_sem_key); lock(&osb->system_file_mutex); *** DEADLOCK *** 3 locks held by syz.0.506/6591: #0: ffff0000c952e460 (sb_writers#24){.+.+}-{0:0}, at: vfs_writev fs/read_write.c:927 [inline] #0: ffff0000c952e460 (sb_writers#24){.+.+}-{0:0}, at: do_pwritev+0x1b4/0x2fc fs/read_write.c:1025 #1: ffff0000de1e2648 (&sb->s_type->i_mutex_key#29){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #1: ffff0000de1e2648 (&sb->s_type->i_mutex_key#29){+.+.}-{3:3}, at: ocfs2_file_write_iter+0x388/0x1b84 fs/ocfs2/file.c:2402 #2: ffff0000de1e22e0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_write_begin+0x190/0x30c fs/ocfs2/aops.c:1903 stack backtrace: CPU: 1 PID: 6591 Comm: syz.0.506 Not tainted 5.15.185-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call trace: dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2011 check_noncircular+0x240/0x2d4 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2928/0x651c kernel/locking/lockdep.c:5012 lock_acquire+0x1f4/0x620 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x194/0x1edc kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0xac/0x11c kernel/locking/mutex.c:743 ocfs2_get_system_file_inode+0x15c/0x5ec fs/ocfs2/sysfile.c:101 ocfs2_reserve_suballoc_bits+0x11c/0x3a68 fs/ocfs2/suballoc.c:776 ocfs2_reserve_cluster_bitmap_bits fs/ocfs2/suballoc.c:1128 [inline] ocfs2_reserve_clusters_with_limit+0x290/0x9e0 fs/ocfs2/suballoc.c:1173 ocfs2_reserve_clusters fs/ocfs2/suballoc.c:1223 [inline] ocfs2_lock_allocators+0x27c/0x518 fs/ocfs2/suballoc.c:2669 ocfs2_write_begin_nolock+0x1e88/0x3764 fs/ocfs2/aops.c:1741 ocfs2_write_begin+0x1b4/0x30c fs/ocfs2/aops.c:1905 generic_perform_write+0x204/0x480 mm/filemap.c:3785 __generic_file_write_iter+0x23c/0x454 mm/filemap.c:3912 ocfs2_file_write_iter+0x12e0/0x1b84 fs/ocfs2/file.c:2472 do_iter_readv_writev+0x3a0/0x4f8 fs/read_write.c:-1 do_iter_write+0x1c4/0x670 fs/read_write.c:855 vfs_writev fs/read_write.c:928 [inline] do_pwritev+0x1c8/0x2fc fs/read_write.c:1025 __do_sys_pwritev2 fs/read_write.c:1084 [inline] __se_sys_pwritev2 fs/read_write.c:1075 [inline] __arm64_sys_pwritev2+0xd4/0x108 fs/read_write.c:1075 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584