XFS (loop0): Quotacheck: Done. ====================================================== WARNING: possible circular locking dependency detected 6.10.0-rc5-syzkaller-00018-g55027e689933 #0 Not tainted ------------------------------------------------------ syz-executor.0/7680 is trying to acquire lock: ffffffff8dd33b20 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:334 [inline] ffffffff8dd33b20 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slub.c:3891 [inline] ffffffff8dd33b20 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:3981 [inline] ffffffff8dd33b20 (fs_reclaim){+.+.}-{0:0}, at: __do_kmalloc_node mm/slub.c:4121 [inline] ffffffff8dd33b20 (fs_reclaim){+.+.}-{0:0}, at: __kmalloc_noprof+0xb5/0x410 mm/slub.c:4135 but task is already holding lock: ffff88802da608d8 (&xfs_nondir_ilock_class#3){++++}-{3:3}, at: xfs_ilock+0x16a/0x420 fs/xfs/xfs_inode.c:209 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&xfs_nondir_ilock_class#3){++++}-{3:3}: down_write_nested+0x3d/0x50 kernel/locking/rwsem.c:1695 xfs_ilock+0x2ef/0x420 fs/xfs/xfs_inode.c:207 xfs_reclaim_inode fs/xfs/xfs_icache.c:943 [inline] xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1629 [inline] xfs_icwalk_ag+0xca6/0x1780 fs/xfs/xfs_icache.c:1711 xfs_icwalk+0x57/0x100 fs/xfs/xfs_icache.c:1760 xfs_reclaim_inodes_nr+0x182/0x250 fs/xfs/xfs_icache.c:1009 super_cache_scan+0x409/0x550 fs/super.c:227 do_shrink_slab+0x44f/0x11c0 mm/shrinker.c:435 shrink_slab+0x18a/0x1310 mm/shrinker.c:662 shrink_one+0x493/0x7c0 mm/vmscan.c:4790 shrink_many mm/vmscan.c:4851 [inline] lru_gen_shrink_node mm/vmscan.c:4951 [inline] shrink_node+0x22bd/0x39b0 mm/vmscan.c:5910 kswapd_shrink_node mm/vmscan.c:6720 [inline] balance_pgdat+0x9a0/0x18f0 mm/vmscan.c:6911 kswapd+0x5ea/0xbf0 mm/vmscan.c:7180 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 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:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __fs_reclaim_acquire mm/page_alloc.c:3801 [inline] fs_reclaim_acquire+0x102/0x160 mm/page_alloc.c:3815 might_alloc include/linux/sched/mm.h:334 [inline] slab_pre_alloc_hook mm/slub.c:3891 [inline] slab_alloc_node mm/slub.c:3981 [inline] __do_kmalloc_node mm/slub.c:4121 [inline] __kmalloc_noprof+0xb5/0x410 mm/slub.c:4135 kmalloc_noprof include/linux/slab.h:664 [inline] xfs_attr_shortform_list fs/xfs/xfs_attr_list.c:117 [inline] xfs_attr_list_ilocked+0x9a0/0x1b00 fs/xfs/xfs_attr_list.c:569 xfs_attr_list+0x1f9/0x2b0 fs/xfs/xfs_attr_list.c:595 xfs_vn_listxattr+0x11f/0x1c0 fs/xfs/xfs_xattr.c:324 vfs_listxattr+0xb7/0x140 fs/xattr.c:493 listxattr+0x69/0x190 fs/xattr.c:840 path_listxattr+0xc3/0x160 fs/xattr.c:864 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 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 *** 1 lock held by syz-executor.0/7680: #0: ffff88802da608d8 (&xfs_nondir_ilock_class#3){++++}-{3:3}, at: xfs_ilock+0x16a/0x420 fs/xfs/xfs_inode.c:209 stack backtrace: CPU: 0 PID: 7680 Comm: syz-executor.0 Not tainted 6.10.0-rc5-syzkaller-00018-g55027e689933 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 check_noncircular+0x31a/0x400 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+0x2478/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __fs_reclaim_acquire mm/page_alloc.c:3801 [inline] fs_reclaim_acquire+0x102/0x160 mm/page_alloc.c:3815 might_alloc include/linux/sched/mm.h:334 [inline] slab_pre_alloc_hook mm/slub.c:3891 [inline] slab_alloc_node mm/slub.c:3981 [inline] __do_kmalloc_node mm/slub.c:4121 [inline] __kmalloc_noprof+0xb5/0x410 mm/slub.c:4135 kmalloc_noprof include/linux/slab.h:664 [inline] xfs_attr_shortform_list fs/xfs/xfs_attr_list.c:117 [inline] xfs_attr_list_ilocked+0x9a0/0x1b00 fs/xfs/xfs_attr_list.c:569 xfs_attr_list+0x1f9/0x2b0 fs/xfs/xfs_attr_list.c:595 xfs_vn_listxattr+0x11f/0x1c0 fs/xfs/xfs_xattr.c:324 vfs_listxattr+0xb7/0x140 fs/xattr.c:493 listxattr+0x69/0x190 fs/xattr.c:840 path_listxattr+0xc3/0x160 fs/xattr.c:864 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f18e667cee9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f18e73990c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000c3 RAX: ffffffffffffffda RBX: 00007f18e67abf80 RCX: 00007f18e667cee9 RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000020000200 RBP: 00007f18e66c949e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f18e67abf80 R15: 00007ffe8c3eaf08