====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.1.464/7048 is trying to acquire lock: ffff888052cb14a0 (&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: ffff88805687e8e8 (&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+0x12d7/0x25e0 fs/ocfs2/namei.c:366 ocfs2_mkdir+0x1b6/0x4b0 fs/ocfs2/namei.c:664 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#2){.+.+}-{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_setattr+0xdb2/0x1d90 fs/ocfs2/file.c:1263 notify_change+0xca0/0xf90 fs/attr.c:499 chmod_common+0x253/0x400 fs/open.c:606 do_fchmodat+0xd4/0x1a0 fs/open.c:645 __do_sys_chmod fs/open.c:663 [inline] __se_sys_chmod fs/open.c:661 [inline] __x64_sys_chmod+0x5c/0x70 fs/open.c:661 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:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3830 [inline] __lock_acquire+0x2d18/0x7c40 kernel/locking/lockdep.c:5063 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5678 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 fs/ocfs2/dir.c:508 [inline] ocfs2_find_entry_el fs/ocfs2/dir.c:715 [inline] ocfs2_find_entry+0x3a8/0x2080 fs/ocfs2/dir.c:1091 ocfs2_rename+0x1e64/0x3930 fs/ocfs2/namei.c:1575 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#2 --> &journal->j_trans_barrier Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&journal->j_trans_barrier); lock(sb_internal#2); lock(&journal->j_trans_barrier); lock(&ocfs2_file_ip_alloc_sem_key); *** DEADLOCK *** 8 locks held by syz.1.464/7048: #0: ffff88807608e460 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:402 #1: ffff88807608e748 (&type->s_vfs_rename_key#2){+.+.}-{3:3}, at: lock_rename fs/namei.c:3089 [inline] #1: ffff88807608e748 (&type->s_vfs_rename_key#2){+.+.}-{3:3}, at: do_renameat2+0x36a/0xc80 fs/namei.c:5017 #2: ffff888052cb1808 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:799 [inline] #2: ffff888052cb1808 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: lock_two_directories fs/namei.c:-1 [inline] #2: ffff888052cb1808 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: lock_rename fs/namei.c:3090 [inline] #2: ffff888052cb1808 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: do_renameat2+0x401/0xc80 fs/namei.c:5017 #3: ffff88805c241808 (&sb->s_type->i_mutex_key#21/5){+.+.}-{3:3}, at: lock_rename include/linux/fs.h:-1 [inline] #3: ffff88805c241808 (&sb->s_type->i_mutex_key#21/5){+.+.}-{3:3}, at: do_renameat2+0x43c/0xc80 fs/namei.c:5017 #4: ffff88805c379808 (&sb->s_type->i_mutex_key#21/2){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:799 [inline] #4: ffff88805c379808 (&sb->s_type->i_mutex_key#21/2){+.+.}-{3:3}, at: vfs_rename+0x7b1/0x10f0 fs/namei.c:4888 #5: ffff88807608e650 (sb_internal#2){.+.+}-{0:0}, at: ocfs2_rename+0x1a42/0x3930 fs/ocfs2/namei.c:1495 #6: ffff88805687e8e8 (&journal->j_trans_barrier){.+.+}-{3:3}, at: ocfs2_start_trans+0x3a4/0x6f0 fs/ocfs2/journal.c:374 #7: ffff88807cf2a990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x2014/0x2240 fs/jbd2/transaction.c:463 stack backtrace: CPU: 0 PID: 7048 Comm: syz.1.464 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+0x296/0x330 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3830 [inline] __lock_acquire+0x2d18/0x7c40 kernel/locking/lockdep.c:5063 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5678 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 fs/ocfs2/dir.c:508 [inline] ocfs2_find_entry_el fs/ocfs2/dir.c:715 [inline] ocfs2_find_entry+0x3a8/0x2080 fs/ocfs2/dir.c:1091 ocfs2_rename+0x1e64/0x3930 fs/ocfs2/namei.c:1575 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: 0033:0x7f525679e159 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:00007f52576f2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000052 RAX: ffffffffffffffda RBX: 00007f5256a25fa0 RCX: 00007f525679e159 RDX: 0000000000000000 RSI: 0000200000000340 RDI: 0000200000000580 RBP: 00007f525683506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5256a26038 R14: 00007f5256a25fa0 R15: 00007ffd017afda8