====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.4.24/4421 is trying to acquire lock: ffff888074e894a0 (&oi->ip_alloc_sem){++++}-{3:3}, at: ocfs2_read_virt_blocks+0x237/0x8d0 fs/ocfs2/extent_map.c:984 but task is already holding lock: ffff88807a57d0e8 (&journal->j_trans_barrier){.+.+}-{3:3}, at: ocfs2_start_trans+0x3a6/0x6f0 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+0x44/0x2e0 kernel/locking/rwsem.c:1498 ocfs2_start_trans+0x3a6/0x6f0 fs/ocfs2/journal.c:374 ocfs2_mknod+0xf5a/0x2510 fs/ocfs2/namei.c:361 ocfs2_create+0x192/0x420 fs/ocfs2/namei.c:674 lookup_open fs/namei.c:3470 [inline] open_last_lookups fs/namei.c:3540 [inline] path_openat+0x11db/0x2fa0 fs/namei.c:3747 do_filp_open+0x1e2/0x410 fs/namei.c:3777 do_sys_openat2+0x150/0x4b0 fs/open.c:1255 do_sys_open fs/open.c:1271 [inline] __do_sys_openat fs/open.c:1287 [inline] __se_sys_openat fs/open.c:1282 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1282 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #1 (sb_internal#3){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1811 [inline] sb_start_intwrite include/linux/fs.h:1928 [inline] ocfs2_start_trans+0x2a7/0x6f0 fs/ocfs2/journal.c:372 ocfs2_zero_start_ordered_transaction fs/ocfs2/file.c:722 [inline] ocfs2_write_zero_page fs/ocfs2/file.c:768 [inline] ocfs2_zero_extend_range fs/ocfs2/file.c:952 [inline] ocfs2_zero_extend+0x94b/0x2790 fs/ocfs2/file.c:997 ocfs2_extend_no_holes+0x260/0x4b0 fs/ocfs2/file.c:1043 ocfs2_expand_nonsparse_inode+0x15d/0x450 fs/ocfs2/aops.c:1622 ocfs2_write_begin_nolock+0x910/0x4400 fs/ocfs2/aops.c:1688 ocfs2_write_begin+0x1b9/0x310 fs/ocfs2/aops.c:1905 generic_perform_write+0x2b6/0x550 mm/filemap.c:3785 __generic_file_write_iter+0x25f/0x4e0 mm/filemap.c:3912 ocfs2_file_write_iter+0x1670/0x1e70 fs/ocfs2/file.c:2472 call_write_iter include/linux/fs.h:2173 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x745/0xd60 fs/read_write.c:594 ksys_pwrite64 fs/read_write.c:701 [inline] __do_sys_pwrite64 fs/read_write.c:711 [inline] __se_sys_pwrite64 fs/read_write.c:708 [inline] __x64_sys_pwrite64+0x19a/0x220 fs/read_write.c:708 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #0 (&oi->ip_alloc_sem){++++}-{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+0x2c42/0x7d10 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498 ocfs2_read_virt_blocks+0x237/0x8d0 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+0x264/0x19d0 fs/ocfs2/dir.c:1928 ocfs2_dir_foreach fs/ocfs2/dir.c:1938 [inline] ocfs2_empty_dir+0x1a8/0x730 fs/ocfs2/dir.c:2156 ocfs2_rename+0x21c0/0x3960 fs/ocfs2/namei.c:1499 vfs_rename+0xbe1/0x1100 fs/namei.c:4840 do_renameat2+0x8b7/0xf60 fs/namei.c:4993 __do_sys_rename fs/namei.c:5039 [inline] __se_sys_rename fs/namei.c:5037 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:5037 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 other info that might help us debug this: Chain exists of: &oi->ip_alloc_sem --> sb_internal#3 --> &journal->j_trans_barrier Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&journal->j_trans_barrier); lock(sb_internal#3); lock(&journal->j_trans_barrier); lock(&oi->ip_alloc_sem); *** DEADLOCK *** 7 locks held by syz.4.24/4421: #0: ffff88807d86c460 (sb_writers#18){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:386 #1: ffff88805e4d5f48 (&type->i_mutex_dir_key#10/1){+.+.}-{3:3}, at: lock_rename include/linux/fs.h:-1 [inline] #1: ffff88805e4d5f48 (&type->i_mutex_dir_key#10/1){+.+.}-{3:3}, at: do_renameat2+0x43d/0xf60 fs/namei.c:4932 #2: ffff888074e89808 (&sb->s_type->i_mutex_key#26){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #2: ffff888074e89808 (&sb->s_type->i_mutex_key#26){+.+.}-{3:3}, at: vfs_rename+0x839/0x1100 fs/namei.c:-1 #3: ffff88805e4ea648 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #3: ffff88805e4ea648 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]){+.+.}-{3:3}, at: ocfs2_lookup_lock_orphan_dir+0xe9/0x2d0 fs/ocfs2/namei.c:2116 #4: ffff88807d86c650 (sb_internal#3){.+.+}-{0:0}, at: ocfs2_rename+0x1a51/0x3960 fs/ocfs2/namei.c:1488 #5: ffff88807a57d0e8 (&journal->j_trans_barrier){.+.+}-{3:3}, at: ocfs2_start_trans+0x3a6/0x6f0 fs/ocfs2/journal.c:374 #6: ffff88807e798990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x134c/0x15c0 fs/jbd2/transaction.c:462 stack backtrace: CPU: 0 PID: 4421 Comm: syz.4.24 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 check_noncircular+0x296/0x330 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+0x2c42/0x7d10 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498 ocfs2_read_virt_blocks+0x237/0x8d0 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+0x264/0x19d0 fs/ocfs2/dir.c:1928 ocfs2_dir_foreach fs/ocfs2/dir.c:1938 [inline] ocfs2_empty_dir+0x1a8/0x730 fs/ocfs2/dir.c:2156 ocfs2_rename+0x21c0/0x3960 fs/ocfs2/namei.c:1499 vfs_rename+0xbe1/0x1100 fs/namei.c:4840 do_renameat2+0x8b7/0xf60 fs/namei.c:4993 __do_sys_rename fs/namei.c:5039 [inline] __se_sys_rename fs/namei.c:5037 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:5037 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7ff88625a799 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:00007ff8844b4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000052 RAX: ffffffffffffffda RBX: 00007ff8864d3fa0 RCX: 00007ff88625a799 RDX: 0000000000000000 RSI: 0000200000000300 RDI: 0000200000000280 RBP: 00007ff8862f0c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff8864d4038 R14: 00007ff8864d3fa0 R15: 00007fffd61ec818