====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.4205/20348 is trying to acquire lock: ffff888043ad22e0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_read_virt_blocks+0x266/0x980 fs/ocfs2/extent_map.c:984 but task is already holding lock: ffff888055dfb4e8 (&journal->j_trans_barrier){.+.+}-{3:3}, at: ocfs2_start_trans+0x3a4/0x6f0 fs/ocfs2/journal.c:374 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&journal->j_trans_barrier){.+.+}-{3:3}: down_read+0x42/0x2d0 kernel/locking/rwsem.c:1520 ocfs2_start_trans+0x3a4/0x6f0 fs/ocfs2/journal.c:374 ocfs2_mknod+0x1266/0x2500 fs/ocfs2/namei.c:361 ocfs2_mkdir+0x1b6/0x4b0 fs/ocfs2/namei.c:659 vfs_mkdir+0x386/0x570 fs/namei.c:4157 do_mkdirat+0x1d8/0x440 fs/namei.c:4182 __do_sys_mkdirat fs/namei.c:4197 [inline] __se_sys_mkdirat fs/namei.c:4195 [inline] __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4195 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #1 (sb_internal#4){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1897 [inline] sb_start_intwrite include/linux/fs.h:2019 [inline] ocfs2_start_trans+0x2a5/0x6f0 fs/ocfs2/journal.c:372 ocfs2_extend_dir+0x11bd/0x4c40 fs/ocfs2/dir.c:3287 ocfs2_prepare_dir_for_insert+0x3217/0x5600 fs/ocfs2/dir.c:4321 ocfs2_mknod+0xb92/0x2500 fs/ocfs2/namei.c:295 ocfs2_mkdir+0x1b6/0x4b0 fs/ocfs2/namei.c:659 vfs_mkdir+0x386/0x570 fs/namei.c:4157 do_mkdirat+0x1d8/0x440 fs/namei.c:4182 __do_sys_mkdirat fs/namei.c:4197 [inline] __se_sys_mkdirat fs/namei.c:4195 [inline] __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4195 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3162 [inline] check_prevs_add kernel/locking/lockdep.c:3281 [inline] validate_chain kernel/locking/lockdep.c:3897 [inline] __lock_acquire+0x3a03/0x7ea0 kernel/locking/lockdep.c:5171 lock_acquire+0x1bc/0x4a0 kernel/locking/lockdep.c:5790 down_read+0x42/0x2d0 kernel/locking/rwsem.c:1520 ocfs2_read_virt_blocks+0x266/0x980 fs/ocfs2/extent_map.c:984 ocfs2_read_dir_block+0xd1/0x4f0 fs/ocfs2/dir.c:508 ocfs2_dir_foreach_blk_el fs/ocfs2/dir.c:1842 [inline] ocfs2_dir_foreach_blk+0x274/0x1a80 fs/ocfs2/dir.c:1928 ocfs2_dir_foreach+0x16d/0x1c0 fs/ocfs2/dir.c:1938 ocfs2_empty_dir+0x105/0x650 fs/ocfs2/dir.c:2156 ocfs2_rename+0x217d/0x3930 fs/ocfs2/namei.c:1501 vfs_rename+0xd57/0x10f0 fs/namei.c:4925 do_renameat2+0x8ac/0xc80 fs/namei.c:5078 __do_sys_rename fs/namei.c:5124 [inline] __se_sys_rename fs/namei.c:5122 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:5122 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Chain exists of: &ocfs2_file_ip_alloc_sem_key --> sb_internal#4 --> &journal->j_trans_barrier Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&journal->j_trans_barrier); lock(sb_internal#4); lock(&journal->j_trans_barrier); rlock(&ocfs2_file_ip_alloc_sem_key); *** DEADLOCK *** 7 locks held by syz.0.4205/20348: #0: ffff888084fc0460 (sb_writers#36){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:402 #1: ffff8880401c09c8 (&type->i_mutex_dir_key#21/1){+.+.}-{3:3}, at: lock_rename include/linux/fs.h:-1 [inline] #1: ffff8880401c09c8 (&type->i_mutex_dir_key#21/1){+.+.}-{3:3}, at: do_renameat2+0x43c/0xc80 fs/namei.c:5017 #2: ffff888043ad2648 (&sb->s_type->i_mutex_key#40){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:764 [inline] #2: ffff888043ad2648 (&sb->s_type->i_mutex_key#40){+.+.}-{3:3}, at: vfs_rename+0x865/0x10f0 fs/namei.c:-1 #3: ffff8880401c5f48 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:764 [inline] #3: ffff8880401c5f48 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]){+.+.}-{3:3}, at: ocfs2_lookup_lock_orphan_dir+0xe9/0x2d0 fs/ocfs2/namei.c:2118 #4: ffff888084fc0650 (sb_internal#4){.+.+}-{0:0}, at: ocfs2_rename+0x1a42/0x3930 fs/ocfs2/namei.c:1490 #5: ffff888055dfb4e8 (&journal->j_trans_barrier){.+.+}-{3:3}, at: ocfs2_start_trans+0x3a4/0x6f0 fs/ocfs2/journal.c:374 #6: ffff888054ce4990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x2014/0x2240 fs/jbd2/transaction.c:463 stack backtrace: CPU: 1 PID: 20348 Comm: syz.0.4205 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 check_noncircular+0x2f8/0x400 kernel/locking/lockdep.c:2215 check_prev_add kernel/locking/lockdep.c:3162 [inline] check_prevs_add kernel/locking/lockdep.c:3281 [inline] validate_chain kernel/locking/lockdep.c:3897 [inline] __lock_acquire+0x3a03/0x7ea0 kernel/locking/lockdep.c:5171 lock_acquire+0x1bc/0x4a0 kernel/locking/lockdep.c:5790 down_read+0x42/0x2d0 kernel/locking/rwsem.c:1520 ocfs2_read_virt_blocks+0x266/0x980 fs/ocfs2/extent_map.c:984 ocfs2_read_dir_block+0xd1/0x4f0 fs/ocfs2/dir.c:508 ocfs2_dir_foreach_blk_el fs/ocfs2/dir.c:1842 [inline] ocfs2_dir_foreach_blk+0x274/0x1a80 fs/ocfs2/dir.c:1928 ocfs2_dir_foreach+0x16d/0x1c0 fs/ocfs2/dir.c:1938 ocfs2_empty_dir+0x105/0x650 fs/ocfs2/dir.c:2156 ocfs2_rename+0x217d/0x3930 fs/ocfs2/namei.c:1501 vfs_rename+0xd57/0x10f0 fs/namei.c:4925 do_renameat2+0x8ac/0xc80 fs/namei.c:5078 __do_sys_rename fs/namei.c:5124 [inline] __se_sys_rename fs/namei.c:5122 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:5122 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fe9ee99f559 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe9ef819028 EFLAGS: 00000246 ORIG_RAX: 0000000000000052 RAX: ffffffffffffffda RBX: 00007fe9eec25fa0 RCX: 00007fe9ee99f559 RDX: 0000000000000000 RSI: 0000200000006440 RDI: 0000200000006400 RBP: 00007fe9eea36b20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe9eec26038 R14: 00007fe9eec25fa0 R15: 00007ffcebb3fba8