====================================================== WARNING: possible circular locking dependency detected 5.11.0-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/28819 is trying to acquire lock: ffffffff8c08c3c0 (fs_reclaim){+.+.}-{0:0}, at: fs_reclaim_acquire+0xf7/0x150 mm/page_alloc.c:4349 but task is already holding lock: ffff88802011e4c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:142 [inline] ffff88802011e4c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x15c/0x13e0 fs/ext4/xattr.c:2308 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&ei->xattr_sem){++++}-{3:3}: down_read+0x9a/0x440 kernel/locking/rwsem.c:1353 ext4_setattr+0x57a/0x1fe0 fs/ext4/inode.c:5373 notify_change+0xb28/0x10f0 fs/attr.c:398 chown_common+0x501/0x5c0 fs/open.c:682 vfs_fchown fs/open.c:750 [inline] vfs_fchown fs/open.c:742 [inline] ksys_fchown+0x111/0x170 fs/open.c:761 __do_sys_fchown fs/open.c:769 [inline] __se_sys_fchown fs/open.c:767 [inline] __x64_sys_fchown+0x6f/0xb0 fs/open.c:767 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae -> #2 (jbd2_handle){++++}-{0:0}: start_this_handle+0xfb9/0x1380 fs/jbd2/transaction.c:446 jbd2__journal_start+0x399/0x930 fs/jbd2/transaction.c:503 __ext4_journal_start_sb+0x227/0x4a0 fs/ext4/ext4_jbd2.c:105 ext4_sample_last_mounted fs/ext4/file.c:803 [inline] ext4_file_open+0x613/0xb50 fs/ext4/file.c:831 do_dentry_open+0x4b9/0x11b0 fs/open.c:826 do_open fs/namei.c:3365 [inline] path_openat+0x1c0e/0x27e0 fs/namei.c:3498 do_filp_open+0x17e/0x3c0 fs/namei.c:3525 do_sys_openat2+0x16d/0x420 fs/open.c:1187 do_sys_open fs/open.c:1203 [inline] __do_sys_open fs/open.c:1211 [inline] __se_sys_open fs/open.c:1207 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1207 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae -> #1 (sb_internal){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1640 [inline] sb_start_intwrite include/linux/fs.h:1757 [inline] ext4_evict_inode+0xe74/0x1940 fs/ext4/inode.c:242 evict+0x2ed/0x6b0 fs/inode.c:577 iput_final fs/inode.c:1653 [inline] iput.part.0+0x57e/0x810 fs/inode.c:1679 iput fs/inode.c:1669 [inline] inode_lru_isolate+0x301/0x4f0 fs/inode.c:778 __list_lru_walk_one+0x178/0x5c0 mm/list_lru.c:222 list_lru_walk_one+0x99/0xd0 mm/list_lru.c:266 list_lru_shrink_walk include/linux/list_lru.h:195 [inline] prune_icache_sb+0xdc/0x140 fs/inode.c:803 super_cache_scan+0x38d/0x590 fs/super.c:107 do_shrink_slab+0x3e4/0x9f0 mm/vmscan.c:512 shrink_slab+0x16f/0x5d0 mm/vmscan.c:673 shrink_node_memcgs mm/vmscan.c:2655 [inline] shrink_node+0x8d1/0x1de0 mm/vmscan.c:2770 kswapd_shrink_node mm/vmscan.c:3513 [inline] balance_pgdat+0x745/0x1270 mm/vmscan.c:3671 kswapd+0x5b6/0xdb0 mm/vmscan.c:3928 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 -> #0 (fs_reclaim){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:2936 [inline] check_prevs_add kernel/locking/lockdep.c:3059 [inline] validate_chain kernel/locking/lockdep.c:3674 [inline] __lock_acquire+0x2b14/0x54c0 kernel/locking/lockdep.c:4900 lock_acquire kernel/locking/lockdep.c:5510 [inline] lock_acquire+0x1ab/0x730 kernel/locking/lockdep.c:5475 __fs_reclaim_acquire mm/page_alloc.c:4327 [inline] fs_reclaim_acquire+0x117/0x150 mm/page_alloc.c:4341 prepare_alloc_pages mm/page_alloc.c:4939 [inline] __alloc_pages_nodemask+0x169/0x730 mm/page_alloc.c:4986 __alloc_pages include/linux/gfp.h:525 [inline] __alloc_pages_node include/linux/gfp.h:538 [inline] alloc_pages_node include/linux/gfp.h:552 [inline] kmalloc_large_node+0x5e/0x110 mm/slub.c:4069 __kmalloc_node+0x2c6/0x370 mm/slub.c:4085 kmalloc_node include/linux/slab.h:577 [inline] kvmalloc_node+0xb4/0xf0 mm/util.c:587 kvmalloc include/linux/mm.h:785 [inline] ext4_xattr_inode_cache_find fs/ext4/xattr.c:1465 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1508 [inline] ext4_xattr_set_entry+0x1ce6/0x3750 fs/ext4/xattr.c:1649 ext4_xattr_ibody_set+0x78/0x2b0 fs/ext4/xattr.c:2224 ext4_xattr_set_handle+0x8f4/0x13e0 fs/ext4/xattr.c:2380 ext4_xattr_set+0x13a/0x340 fs/ext4/xattr.c:2493 __vfs_setxattr+0x115/0x180 fs/xattr.c:180 __vfs_setxattr_noperm+0x125/0x4c0 fs/xattr.c:214 __vfs_setxattr_locked+0x1cf/0x260 fs/xattr.c:274 vfs_setxattr+0x13f/0x330 fs/xattr.c:300 setxattr+0x218/0x2b0 fs/xattr.c:573 path_setxattr+0x197/0x1c0 fs/xattr.c:593 __do_sys_setxattr fs/xattr.c:609 [inline] __se_sys_setxattr fs/xattr.c:605 [inline] __ia32_sys_setxattr+0xbc/0x150 fs/xattr.c:605 do_syscall_32_irqs_on arch/x86/entry/common.c:77 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:139 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:164 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c other info that might help us debug this: Chain exists of: fs_reclaim --> jbd2_handle --> &ei->xattr_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->xattr_sem); lock(jbd2_handle); lock(&ei->xattr_sem); lock(fs_reclaim); *** DEADLOCK *** 3 locks held by syz-executor.3/28819: #0: ffff888028a98460 (sb_writers#5){.+.+}-{0:0}, at: path_setxattr+0xb2/0x1c0 fs/xattr.c:591 #1: ffff88802011e888 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff88802011e888 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: vfs_setxattr+0x11c/0x330 fs/xattr.c:299 #2: ffff88802011e4c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:142 [inline] #2: ffff88802011e4c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x15c/0x13e0 fs/ext4/xattr.c:2308 stack backtrace: CPU: 2 PID: 28819 Comm: syz-executor.3 Not tainted 5.11.0-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0xfa/0x151 lib/dump_stack.c:120 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2127 check_prev_add kernel/locking/lockdep.c:2936 [inline] check_prevs_add kernel/locking/lockdep.c:3059 [inline] validate_chain kernel/locking/lockdep.c:3674 [inline] __lock_acquire+0x2b14/0x54c0 kernel/locking/lockdep.c:4900 lock_acquire kernel/locking/lockdep.c:5510 [inline] lock_acquire+0x1ab/0x730 kernel/locking/lockdep.c:5475 __fs_reclaim_acquire mm/page_alloc.c:4327 [inline] fs_reclaim_acquire+0x117/0x150 mm/page_alloc.c:4341 prepare_alloc_pages mm/page_alloc.c:4939 [inline] __alloc_pages_nodemask+0x169/0x730 mm/page_alloc.c:4986 __alloc_pages include/linux/gfp.h:525 [inline] __alloc_pages_node include/linux/gfp.h:538 [inline] alloc_pages_node include/linux/gfp.h:552 [inline] kmalloc_large_node+0x5e/0x110 mm/slub.c:4069 __kmalloc_node+0x2c6/0x370 mm/slub.c:4085 kmalloc_node include/linux/slab.h:577 [inline] kvmalloc_node+0xb4/0xf0 mm/util.c:587 kvmalloc include/linux/mm.h:785 [inline] ext4_xattr_inode_cache_find fs/ext4/xattr.c:1465 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1508 [inline] ext4_xattr_set_entry+0x1ce6/0x3750 fs/ext4/xattr.c:1649 ext4_xattr_ibody_set+0x78/0x2b0 fs/ext4/xattr.c:2224 ext4_xattr_set_handle+0x8f4/0x13e0 fs/ext4/xattr.c:2380 ext4_xattr_set+0x13a/0x340 fs/ext4/xattr.c:2493 __vfs_setxattr+0x115/0x180 fs/xattr.c:180 __vfs_setxattr_noperm+0x125/0x4c0 fs/xattr.c:214 __vfs_setxattr_locked+0x1cf/0x260 fs/xattr.c:274 vfs_setxattr+0x13f/0x330 fs/xattr.c:300 setxattr+0x218/0x2b0 fs/xattr.c:573 path_setxattr+0x197/0x1c0 fs/xattr.c:593 __do_sys_setxattr fs/xattr.c:609 [inline] __se_sys_setxattr fs/xattr.c:605 [inline] __ia32_sys_setxattr+0xbc/0x150 fs/xattr.c:605 do_syscall_32_irqs_on arch/x86/entry/common.c:77 [inline] __do_fast_syscall_32+0x56/0x80 arch/x86/entry/common.c:139 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:164 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7f59549 Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f55535fc EFLAGS: 00000296 ORIG_RAX: 00000000000000e2 RAX: ffffffffffffffda RBX: 0000000020000080 RCX: 00000000200000c0 RDX: 0000000020000380 RSI: 000000000000c001 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000