====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc3-syzkaller-00283-gf1a3944c860b #0 Not tainted ------------------------------------------------------ syz.8.411/9941 is trying to acquire lock: ffff888057782610 (sb_internal#4){.+.+}-{0:0}, at: ocfs2_write_begin_inline fs/ocfs2/aops.c:1458 [inline] ffff888057782610 (sb_internal#4){.+.+}-{0:0}, at: ocfs2_try_to_write_inline_data fs/ocfs2/aops.c:1562 [inline] ffff888057782610 (sb_internal#4){.+.+}-{0:0}, at: ocfs2_write_begin_nolock+0x1ca6/0x4340 fs/ocfs2/aops.c:1648 but task is already holding lock: ffff888054d4ea20 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_write_begin+0x198/0x310 fs/ocfs2/aops.c:1880 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #6 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577 ocfs2_lock_global_qf+0x1e8/0x270 fs/ocfs2/quota_global.c:314 ocfs2_acquire_dquot+0x2b0/0xb30 fs/ocfs2/quota_global.c:828 dqget+0x7ae/0xf10 fs/quota/dquot.c:977 __dquot_initialize+0x3b3/0xcb0 fs/quota/dquot.c:1505 ocfs2_get_init_inode+0x13b/0x1b0 fs/ocfs2/namei.c:202 ocfs2_symlink+0xaee/0x23e0 fs/ocfs2/namei.c:1887 vfs_symlink+0x140/0x2f0 fs/namei.c:4723 do_symlinkat+0x1b1/0x3f0 fs/namei.c:4749 __do_sys_symlink fs/namei.c:4770 [inline] __se_sys_symlink fs/namei.c:4768 [inline] __x64_sys_symlink+0x7a/0x90 fs/namei.c:4768 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #5 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7){+.+.}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:867 [inline] ocfs2_lock_global_qf+0x1ca/0x270 fs/ocfs2/quota_global.c:313 ocfs2_acquire_dquot+0x2b0/0xb30 fs/ocfs2/quota_global.c:828 dqget+0x7ae/0xf10 fs/quota/dquot.c:977 __dquot_initialize+0x3b3/0xcb0 fs/quota/dquot.c:1505 ocfs2_get_init_inode+0x13b/0x1b0 fs/ocfs2/namei.c:202 ocfs2_symlink+0xaee/0x23e0 fs/ocfs2/namei.c:1887 vfs_symlink+0x140/0x2f0 fs/namei.c:4723 do_symlinkat+0x1b1/0x3f0 fs/namei.c:4749 __do_sys_symlink fs/namei.c:4770 [inline] __se_sys_symlink fs/namei.c:4768 [inline] __x64_sys_symlink+0x7a/0x90 fs/namei.c:4768 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #4 (&dquot->dq_lock){+.+.}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:746 wait_on_dquot fs/quota/dquot.c:354 [inline] dqget+0x72a/0xf10 fs/quota/dquot.c:972 dquot_transfer+0x2f8/0x6d0 fs/quota/dquot.c:2140 ext4_setattr+0x865/0x1bd0 fs/ext4/inode.c:5460 notify_change+0xb33/0xe40 fs/attr.c:552 chown_common+0x3f9/0x5a0 fs/open.c:782 do_fchownat+0x161/0x270 fs/open.c:813 __do_sys_chown fs/open.c:833 [inline] __se_sys_chown fs/open.c:831 [inline] __x64_sys_chown+0x82/0xa0 fs/open.c:831 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #3 (&ei->xattr_sem){++++}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577 ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline] ext4_xattr_set_handle+0x165/0x1590 fs/ext4/xattr.c:2362 ext4_initxattrs+0x9f/0x110 fs/ext4/xattr_security.c:44 security_inode_init_security+0x29d/0x3f0 security/security.c:1852 __ext4_new_inode+0x3257/0x3bd0 fs/ext4/ialloc.c:1326 ext4_create+0x22d/0x460 fs/ext4/namei.c:2824 lookup_open fs/namei.c:3701 [inline] open_last_lookups fs/namei.c:3800 [inline] path_openat+0x14f1/0x3830 fs/namei.c:4036 do_filp_open+0x1fa/0x410 fs/namei.c:4066 do_sys_openat2+0x121/0x1c0 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_openat fs/open.c:1460 [inline] __se_sys_openat fs/open.c:1455 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1455 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (jbd2_handle){++++}-{0:0}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 start_this_handle+0x1fa7/0x21c0 fs/jbd2/transaction.c:444 jbd2__journal_start+0x2c1/0x5b0 fs/jbd2/transaction.c:501 jbd2_journal_start+0x2a/0x40 fs/jbd2/transaction.c:540 ocfs2_start_trans+0x376/0x6d0 fs/ocfs2/journal.c:352 ocfs2_block_group_alloc fs/ocfs2/suballoc.c:685 [inline] ocfs2_reserve_suballoc_bits+0x711/0x45f0 fs/ocfs2/suballoc.c:832 ocfs2_reserve_new_metadata_blocks+0x403/0x940 fs/ocfs2/suballoc.c:982 ocfs2_mknod+0xe08/0x2050 fs/ocfs2/namei.c:347 ocfs2_create+0x1a5/0x440 fs/ocfs2/namei.c:673 lookup_open fs/namei.c:3701 [inline] open_last_lookups fs/namei.c:3800 [inline] path_openat+0x14f1/0x3830 fs/namei.c:4036 do_filp_open+0x1fa/0x410 fs/namei.c:4066 do_sys_openat2+0x121/0x1c0 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_openat fs/open.c:1460 [inline] __se_sys_openat fs/open.c:1455 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1455 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&journal->j_trans_barrier){.+.+}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 down_read+0x46/0x2e0 kernel/locking/rwsem.c:1524 ocfs2_start_trans+0x36a/0x6d0 fs/ocfs2/journal.c:350 ocfs2_block_group_alloc fs/ocfs2/suballoc.c:685 [inline] ocfs2_reserve_suballoc_bits+0x711/0x45f0 fs/ocfs2/suballoc.c:832 ocfs2_reserve_new_metadata_blocks+0x403/0x940 fs/ocfs2/suballoc.c:982 ocfs2_mknod+0xe08/0x2050 fs/ocfs2/namei.c:347 ocfs2_create+0x1a5/0x440 fs/ocfs2/namei.c:673 lookup_open fs/namei.c:3701 [inline] open_last_lookups fs/namei.c:3800 [inline] path_openat+0x14f1/0x3830 fs/namei.c:4036 do_filp_open+0x1fa/0x410 fs/namei.c:4066 do_sys_openat2+0x121/0x1c0 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_openat fs/open.c:1460 [inline] __se_sys_openat fs/open.c:1455 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1455 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (sb_internal#4){.+.+}-{0:0}: check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909 __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 percpu_down_read include/linux/percpu-rwsem.h:52 [inline] __sb_start_write include/linux/fs.h:1783 [inline] sb_start_intwrite include/linux/fs.h:1966 [inline] ocfs2_start_trans+0x26b/0x6d0 fs/ocfs2/journal.c:348 ocfs2_write_begin_inline fs/ocfs2/aops.c:1458 [inline] ocfs2_try_to_write_inline_data fs/ocfs2/aops.c:1562 [inline] ocfs2_write_begin_nolock+0x1ca6/0x4340 fs/ocfs2/aops.c:1648 ocfs2_write_begin+0x1bb/0x310 fs/ocfs2/aops.c:1882 generic_perform_write+0x2c4/0x910 mm/filemap.c:4103 ocfs2_file_write_iter+0x157a/0x1d10 fs/ocfs2/file.c:2469 new_sync_write fs/read_write.c:591 [inline] vfs_write+0x548/0xa90 fs/read_write.c:684 ksys_write+0x145/0x250 fs/read_write.c:736 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: sb_internal#4 --> &ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7 --> &ocfs2_quota_ip_alloc_sem_key Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ocfs2_quota_ip_alloc_sem_key); lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7); lock(&ocfs2_quota_ip_alloc_sem_key); rlock(sb_internal#4); *** DEADLOCK *** 4 locks held by syz.8.411/9941: #0: ffff888050484ef8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x247/0x320 fs/file.c:1213 #1: ffff888057782420 (sb_writers#25){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3041 [inline] #1: ffff888057782420 (sb_writers#25){.+.+}-{0:0}, at: vfs_write+0x211/0xa90 fs/read_write.c:680 #2: ffff888054d4ed80 (&sb->s_type->i_mutex_key#31){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] #2: ffff888054d4ed80 (&sb->s_type->i_mutex_key#31){+.+.}-{4:4}, at: ocfs2_file_write_iter+0x429/0x1d10 fs/ocfs2/file.c:2399 #3: ffff888054d4ea20 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_write_begin+0x198/0x310 fs/ocfs2/aops.c:1880 stack backtrace: CPU: 1 UID: 0 PID: 9941 Comm: syz.8.411 Not tainted 6.15.0-rc3-syzkaller-00283-gf1a3944c860b #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2079 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2211 check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909 __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 percpu_down_read include/linux/percpu-rwsem.h:52 [inline] __sb_start_write include/linux/fs.h:1783 [inline] sb_start_intwrite include/linux/fs.h:1966 [inline] ocfs2_start_trans+0x26b/0x6d0 fs/ocfs2/journal.c:348 ocfs2_write_begin_inline fs/ocfs2/aops.c:1458 [inline] ocfs2_try_to_write_inline_data fs/ocfs2/aops.c:1562 [inline] ocfs2_write_begin_nolock+0x1ca6/0x4340 fs/ocfs2/aops.c:1648 ocfs2_write_begin+0x1bb/0x310 fs/ocfs2/aops.c:1882 generic_perform_write+0x2c4/0x910 mm/filemap.c:4103 ocfs2_file_write_iter+0x157a/0x1d10 fs/ocfs2/file.c:2469 new_sync_write fs/read_write.c:591 [inline] vfs_write+0x548/0xa90 fs/read_write.c:684 ksys_write+0x145/0x250 fs/read_write.c:736 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f77a878e969 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f77a65f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f77a89b6080 RCX: 00007f77a878e969 RDX: 0000000000000028 RSI: 0000000000000000 RDI: 0000000000000007 RBP: 00007f77a8810ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f77a89b6080 R15: 00007ffe80643e98