====================================================== WARNING: possible circular locking dependency detected 6.11.0-rc7-syzkaller #0 Not tainted ------------------------------------------------------ syz.4.1455/16784 is trying to acquire lock: ffffffff8ea2fde0 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:334 [inline] ffffffff8ea2fde0 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slub.c:3943 [inline] ffffffff8ea2fde0 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:4021 [inline] ffffffff8ea2fde0 (fs_reclaim){+.+.}-{0:0}, at: __do_kmalloc_node mm/slub.c:4161 [inline] ffffffff8ea2fde0 (fs_reclaim){+.+.}-{0:0}, at: __kmalloc_noprof+0xa9/0x400 mm/slub.c:4174 but task is already holding lock: ffff88805f365e18 (&xfs_nondir_ilock_class#3){++++}-{3:3}, at: xfs_ilock_attr_map_shared+0x8c/0xc0 fs/xfs/xfs_inode.c:84 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&xfs_nondir_ilock_class#3){++++}-{3:3}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759 down_read_nested+0xb5/0xa50 kernel/locking/rwsem.c:1651 xfs_can_free_eofblocks+0x5f1/0x8d0 fs/xfs/xfs_bmap_util.c:550 xfs_inode_mark_reclaimable+0x1bb/0xf60 fs/xfs/xfs_icache.c:2148 destroy_inode fs/inode.c:313 [inline] evict+0x80b/0x950 fs/inode.c:729 dispose_list fs/inode.c:747 [inline] prune_icache_sb+0x239/0x2f0 fs/inode.c:932 super_cache_scan+0x38c/0x4b0 fs/super.c:223 do_shrink_slab+0x703/0x1160 mm/shrinker.c:435 shrink_slab_memcg mm/shrinker.c:548 [inline] shrink_slab+0x878/0x14d0 mm/shrinker.c:626 shrink_one+0x43b/0x850 mm/vmscan.c:4795 shrink_many mm/vmscan.c:4856 [inline] lru_gen_shrink_node mm/vmscan.c:4934 [inline] shrink_node+0x3799/0x3de0 mm/vmscan.c:5914 kswapd_shrink_node mm/vmscan.c:6742 [inline] balance_pgdat mm/vmscan.c:6934 [inline] kswapd+0x1cbc/0x3720 mm/vmscan.c:7203 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #0 (fs_reclaim){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3133 [inline] check_prevs_add kernel/locking/lockdep.c:3252 [inline] validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3868 __lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5142 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759 __fs_reclaim_acquire mm/page_alloc.c:3825 [inline] fs_reclaim_acquire+0x88/0x140 mm/page_alloc.c:3839 might_alloc include/linux/sched/mm.h:334 [inline] slab_pre_alloc_hook mm/slub.c:3943 [inline] slab_alloc_node mm/slub.c:4021 [inline] __do_kmalloc_node mm/slub.c:4161 [inline] __kmalloc_noprof+0xa9/0x400 mm/slub.c:4174 kmalloc_noprof include/linux/slab.h:685 [inline] xfs_attr_shortform_list+0x753/0x1900 fs/xfs/xfs_attr_list.c:117 xfs_attr_list+0x1d0/0x270 fs/xfs/xfs_attr_list.c:595 xfs_vn_listxattr+0x1d2/0x2c0 fs/xfs/xfs_xattr.c:341 ovl_copy_xattr+0x1a2/0xb60 fs/overlayfs/copy_up.c:98 ovl_copy_up_metadata+0x24f/0xda0 fs/overlayfs/copy_up.c:650 ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:870 [inline] ovl_do_copy_up fs/overlayfs/copy_up.c:976 [inline] ovl_copy_up_one fs/overlayfs/copy_up.c:1168 [inline] ovl_copy_up_flags+0x1eba/0x4470 fs/overlayfs/copy_up.c:1223 ovl_open+0x142/0x2a0 fs/overlayfs/file.c:154 do_dentry_open+0x972/0x1440 fs/open.c:959 vfs_open+0x3e/0x330 fs/open.c:1089 do_open fs/namei.c:3727 [inline] path_openat+0x2b3e/0x3470 fs/namei.c:3886 do_filp_open+0x235/0x490 fs/namei.c:3913 do_sys_openat2+0x13e/0x1d0 fs/open.c:1416 do_sys_open fs/open.c:1431 [inline] __do_sys_creat fs/open.c:1507 [inline] __se_sys_creat fs/open.c:1501 [inline] __x64_sys_creat+0x123/0x170 fs/open.c:1501 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(&xfs_nondir_ilock_class#3); lock(fs_reclaim); lock(&xfs_nondir_ilock_class#3); lock(fs_reclaim); *** DEADLOCK *** 4 locks held by syz.4.1455/16784: #0: ffff8880438c0420 (sb_writers#18){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515 #1: ffff88805f2ed048 (&ovl_i_lock_key[depth]){+.+.}-{3:3}, at: ovl_inode_lock_interruptible fs/overlayfs/overlayfs.h:657 [inline] #1: ffff88805f2ed048 (&ovl_i_lock_key[depth]){+.+.}-{3:3}, at: ovl_copy_up_start+0x53/0x310 fs/overlayfs/util.c:719 #2: ffff888051282420 (sb_writers#32){.+.+}-{0:0}, at: ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:868 [inline] #2: ffff888051282420 (sb_writers#32){.+.+}-{0:0}, at: ovl_do_copy_up fs/overlayfs/copy_up.c:976 [inline] #2: ffff888051282420 (sb_writers#32){.+.+}-{0:0}, at: ovl_copy_up_one fs/overlayfs/copy_up.c:1168 [inline] #2: ffff888051282420 (sb_writers#32){.+.+}-{0:0}, at: ovl_copy_up_flags+0x1ead/0x4470 fs/overlayfs/copy_up.c:1223 #3: ffff88805f365e18 (&xfs_nondir_ilock_class#3){++++}-{3:3}, at: xfs_ilock_attr_map_shared+0x8c/0xc0 fs/xfs/xfs_inode.c:84 stack backtrace: CPU: 1 UID: 0 PID: 16784 Comm: syz.4.1455 Not tainted 6.11.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2186 check_prev_add kernel/locking/lockdep.c:3133 [inline] check_prevs_add kernel/locking/lockdep.c:3252 [inline] validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3868 __lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5142 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759 __fs_reclaim_acquire mm/page_alloc.c:3825 [inline] fs_reclaim_acquire+0x88/0x140 mm/page_alloc.c:3839 might_alloc include/linux/sched/mm.h:334 [inline] slab_pre_alloc_hook mm/slub.c:3943 [inline] slab_alloc_node mm/slub.c:4021 [inline] __do_kmalloc_node mm/slub.c:4161 [inline] __kmalloc_noprof+0xa9/0x400 mm/slub.c:4174 kmalloc_noprof include/linux/slab.h:685 [inline] xfs_attr_shortform_list+0x753/0x1900 fs/xfs/xfs_attr_list.c:117 xfs_attr_list+0x1d0/0x270 fs/xfs/xfs_attr_list.c:595 xfs_vn_listxattr+0x1d2/0x2c0 fs/xfs/xfs_xattr.c:341 ovl_copy_xattr+0x1a2/0xb60 fs/overlayfs/copy_up.c:98 ovl_copy_up_metadata+0x24f/0xda0 fs/overlayfs/copy_up.c:650 ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:870 [inline] ovl_do_copy_up fs/overlayfs/copy_up.c:976 [inline] ovl_copy_up_one fs/overlayfs/copy_up.c:1168 [inline] ovl_copy_up_flags+0x1eba/0x4470 fs/overlayfs/copy_up.c:1223 ovl_open+0x142/0x2a0 fs/overlayfs/file.c:154 do_dentry_open+0x972/0x1440 fs/open.c:959 vfs_open+0x3e/0x330 fs/open.c:1089 do_open fs/namei.c:3727 [inline] path_openat+0x2b3e/0x3470 fs/namei.c:3886 do_filp_open+0x235/0x490 fs/namei.c:3913 do_sys_openat2+0x13e/0x1d0 fs/open.c:1416 do_sys_open fs/open.c:1431 [inline] __do_sys_creat fs/open.c:1507 [inline] __se_sys_creat fs/open.c:1501 [inline] __x64_sys_creat+0x123/0x170 fs/open.c:1501 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f02ec97cef9 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:00007f02ed69c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007f02ecb35f80 RCX: 00007f02ec97cef9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200000c0 RBP: 00007f02ec9ef046 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f02ecb35f80 R15: 00007ffd637bdb68