EXT4-fs (loop3): mounted filesystem 00000000-0000-0000-0000-000000d40000 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /38/file1 supports timestamps until 2038-01-19 (0x7fffffff) ====================================================== WARNING: possible circular locking dependency detected 6.6.99-syzkaller #0 Not tainted ------------------------------------------------------ syz.3.6351/23129 is trying to acquire lock: ffff888058a86968 (&dquot->dq_lock){+.+.}-{3:3}, at: wait_on_dquot fs/quota/dquot.c:356 [inline] ffff888058a86968 (&dquot->dq_lock){+.+.}-{3:3}, at: dqget+0x6fc/0xeb0 fs/quota/dquot.c:983 but task is already holding lock: ffff88804bcbb2c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] ffff88804bcbb2c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x166/0x1290 fs/ext4/xattr.c:2377 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&ei->xattr_sem){++++}-{3:3}: down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520 ext4_readpage_inline+0x36/0x5d0 fs/ext4/inline.c:519 ext4_read_folio+0x158/0x2f0 fs/ext4/inode.c:3172 filemap_read_folio+0x167/0x760 mm/filemap.c:2420 filemap_create_folio mm/filemap.c:2548 [inline] filemap_get_pages+0xa80/0x1e10 mm/filemap.c:2601 filemap_read+0x3d0/0xec0 mm/filemap.c:2690 __kernel_read+0x2e3/0x6f0 fs/read_write.c:428 integrity_kernel_read+0x8a/0xd0 security/integrity/iint.c:221 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:485 [inline] ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline] ima_calc_file_hash+0x978/0x17d0 security/integrity/ima/ima_crypto.c:573 ima_collect_measurement+0x462/0x980 security/integrity/ima/ima_api.c:290 process_measurement+0x1074/0x1ad0 security/integrity/ima/ima_main.c:364 ima_file_check+0xc6/0x100 security/integrity/ima/ima_main.c:562 do_open fs/namei.c:3634 [inline] path_openat+0x2811/0x3190 fs/namei.c:3789 do_filp_open+0x1c5/0x3d0 fs/namei.c:3816 do_sys_openat2+0x12c/0x1c0 fs/open.c:1419 do_sys_open fs/open.c:1434 [inline] __do_sys_openat fs/open.c:1450 [inline] __se_sys_openat fs/open.c:1445 [inline] __x64_sys_openat+0x139/0x160 fs/open.c:1445 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #3 (mapping.invalidate_lock){++++}-{3:3}: down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520 filemap_invalidate_lock_shared include/linux/fs.h:859 [inline] page_cache_ra_unbounded+0xdc/0x770 mm/readahead.c:225 do_async_mmap_readahead mm/filemap.c:3274 [inline] filemap_fault+0x541/0x15a0 mm/filemap.c:3328 __do_fault+0x13b/0x4e0 mm/memory.c:4243 do_read_fault mm/memory.c:4616 [inline] do_fault mm/memory.c:4753 [inline] do_pte_missing mm/memory.c:3688 [inline] handle_pte_fault mm/memory.c:5025 [inline] __handle_mm_fault mm/memory.c:5166 [inline] handle_mm_fault+0x3886/0x4920 mm/memory.c:5331 faultin_page mm/gup.c:868 [inline] __get_user_pages+0x5ea/0x1470 mm/gup.c:1167 __get_user_pages_locked mm/gup.c:1431 [inline] get_dump_page+0x103/0x200 mm/gup.c:1939 dump_user_range+0x12c/0x800 fs/coredump.c:982 elf_core_dump+0x3114/0x36e0 fs/binfmt_elf.c:2184 do_coredump+0x1755/0x2480 fs/coredump.c:833 get_signal+0x1133/0x1400 kernel/signal.c:2888 arch_do_signal_or_restart+0x96/0x780 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210 irqentry_exit_to_user_mode+0x9/0x40 kernel/entry/common.c:315 exc_page_fault+0x8f/0x110 arch/x86/mm/fault.c:1524 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608 -> #2 (&mm->mmap_lock){++++}-{3:3}: __might_fault+0xc6/0x120 mm/memory.c:5946 _copy_to_user+0x2a/0xa0 lib/usercopy.c:36 copy_to_user include/linux/uaccess.h:191 [inline] fiemap_fill_next_extent+0x1c1/0x390 fs/ioctl.c:145 ocfs2_fiemap+0x882/0xc80 fs/ocfs2/extent_map.c:796 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x140c/0x1bb0 fs/ioctl.c:811 __do_sys_ioctl fs/ioctl.c:869 [inline] __se_sys_ioctl+0x83/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #1 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}: down_write+0x97/0x1f0 kernel/locking/rwsem.c:1573 ocfs2_create_local_dquot+0x1a4/0x1790 fs/ocfs2/quota_local.c:1224 ocfs2_acquire_dquot+0x7cf/0xaf0 fs/ocfs2/quota_global.c:871 dqget+0x77c/0xeb0 fs/quota/dquot.c:988 __dquot_initialize+0x3ba/0xcb0 fs/quota/dquot.c:1516 ocfs2_get_init_inode+0x13c/0x1b0 fs/ocfs2/namei.c:202 ocfs2_mknod+0x867/0x20f0 fs/ocfs2/namei.c:310 ocfs2_mkdir+0x196/0x410 fs/ocfs2/namei.c:657 vfs_mkdir+0x296/0x440 fs/namei.c:4113 do_mkdirat+0x1d4/0x440 fs/namei.c:4136 __do_sys_mkdirat fs/namei.c:4151 [inline] __se_sys_mkdirat fs/namei.c:4149 [inline] __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4149 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&dquot->dq_lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x129/0xcc0 kernel/locking/mutex.c:747 wait_on_dquot fs/quota/dquot.c:356 [inline] dqget+0x6fc/0xeb0 fs/quota/dquot.c:983 __dquot_initialize+0x3ba/0xcb0 fs/quota/dquot.c:1516 __ext4_new_inode+0x77b/0x3a00 fs/ext4/ialloc.c:995 ext4_xattr_inode_create fs/ext4/xattr.c:1495 [inline] ext4_xattr_inode_lookup_create+0x57b/0x1d80 fs/ext4/xattr.c:1605 ext4_xattr_block_set+0x23e/0x32a0 fs/ext4/xattr.c:1925 ext4_xattr_set_handle+0xbff/0x1290 fs/ext4/xattr.c:2462 ext4_xattr_set+0x22d/0x320 fs/ext4/xattr.c:2564 __vfs_setxattr+0x431/0x470 fs/xattr.c:201 __vfs_setxattr_noperm+0x12d/0x5e0 fs/xattr.c:235 vfs_setxattr+0x16c/0x2f0 fs/xattr.c:322 do_setxattr fs/xattr.c:630 [inline] path_setxattr+0x362/0x550 fs/xattr.c:659 __do_sys_setxattr fs/xattr.c:677 [inline] __se_sys_setxattr fs/xattr.c:673 [inline] __x64_sys_setxattr+0xbb/0xd0 fs/xattr.c:673 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Chain exists of: &dquot->dq_lock --> mapping.invalidate_lock --> &ei->xattr_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->xattr_sem); lock(mapping.invalidate_lock); lock(&ei->xattr_sem); lock(&dquot->dq_lock); *** DEADLOCK *** 3 locks held by syz.3.6351/23129: #0: ffff88807b3f8418 (sb_writers#4){++++}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:403 #1: ffff88804bcbb610 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] #1: ffff88804bcbb610 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: vfs_setxattr+0x145/0x2f0 fs/xattr.c:321 #2: ffff88804bcbb2c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] #2: ffff88804bcbb2c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x166/0x1290 fs/ext4/xattr.c:2377 stack backtrace: CPU: 1 PID: 23129 Comm: syz.3.6351 Not tainted 6.6.99-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 check_noncircular+0x2bd/0x3c0 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x129/0xcc0 kernel/locking/mutex.c:747 wait_on_dquot fs/quota/dquot.c:356 [inline] dqget+0x6fc/0xeb0 fs/quota/dquot.c:983 __dquot_initialize+0x3ba/0xcb0 fs/quota/dquot.c:1516 __ext4_new_inode+0x77b/0x3a00 fs/ext4/ialloc.c:995 ext4_xattr_inode_create fs/ext4/xattr.c:1495 [inline] ext4_xattr_inode_lookup_create+0x57b/0x1d80 fs/ext4/xattr.c:1605 ext4_xattr_block_set+0x23e/0x32a0 fs/ext4/xattr.c:1925 ext4_xattr_set_handle+0xbff/0x1290 fs/ext4/xattr.c:2462 ext4_xattr_set+0x22d/0x320 fs/ext4/xattr.c:2564 __vfs_setxattr+0x431/0x470 fs/xattr.c:201 __vfs_setxattr_noperm+0x12d/0x5e0 fs/xattr.c:235 vfs_setxattr+0x16c/0x2f0 fs/xattr.c:322 do_setxattr fs/xattr.c:630 [inline] path_setxattr+0x362/0x550 fs/xattr.c:659 __do_sys_setxattr fs/xattr.c:677 [inline] __se_sys_setxattr fs/xattr.c:673 [inline] __x64_sys_setxattr+0xbb/0xd0 fs/xattr.c:673 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fd65cb8e9a9 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:00007fd65da1b038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc RAX: ffffffffffffffda RBX: 00007fd65cdb5fa0 RCX: 00007fd65cb8e9a9 RDX: 0000200000001400 RSI: 00002000000001c0 RDI: 0000200000000380 RBP: 00007fd65cc10d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000835 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fd65cdb5fa0 R15: 00007fff41276038