Hello, syzbot found the following issue on: HEAD commit: f1b785f4c787 Merge tag 'for_linus' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1352c130580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c3a3896a92fb300b dashboard link: https://syzkaller.appspot.com/bug?extid=b143b25b374fbc5c3a04 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/3cdfef160cc2/disk-f1b785f4.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f0f0ec3434aa/vmlinux-f1b785f4.xz kernel image: https://storage.googleapis.com/syzbot-assets/6a901270f54d/bzImage-f1b785f4.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b143b25b374fbc5c3a04@xxxxxxxxxxxxxxxxxxxxxxxxx XFS (loop8): Mounting V5 Filesystem bfdc47fc-10d8-4eed-a562-11a831b3f791 XFS (loop8): Ending clean mount ====================================================== WARNING: possible circular locking dependency detected 6.12.0-rc7-syzkaller-00042-gf1b785f4c787 #0 Not tainted ------------------------------------------------------ syz.8.662/10149 is trying to acquire lock: ffffffff8e347080 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:318 [inline] ffffffff8e347080 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slub.c:4036 [inline] ffffffff8e347080 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:4114 [inline] ffffffff8e347080 (fs_reclaim){+.+.}-{0:0}, at: __do_kmalloc_node mm/slub.c:4263 [inline] ffffffff8e347080 (fs_reclaim){+.+.}-{0:0}, at: __kmalloc_noprof+0xb1/0x400 mm/slub.c:4276 but task is already holding lock: ffff88805a939858 (&xfs_dir_ilock_class){++++}-{3:3}, at: xfs_ilock+0xf5/0x210 fs/xfs/xfs_inode.c:166 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&xfs_dir_ilock_class){++++}-{3:3}: down_write_nested+0x97/0x210 kernel/locking/rwsem.c:1693 xfs_ilock+0x198/0x210 fs/xfs/xfs_inode.c:164 xfs_reclaim_inode fs/xfs/xfs_icache.c:981 [inline] xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1675 [inline] xfs_icwalk_ag+0xca6/0x1780 fs/xfs/xfs_icache.c:1757 xfs_icwalk fs/xfs/xfs_icache.c:1805 [inline] xfs_reclaim_inodes_nr+0x1bc/0x300 fs/xfs/xfs_icache.c:1047 super_cache_scan+0x40c/0x550 fs/super.c:227 do_shrink_slab+0x452/0x11c0 mm/shrinker.c:437 shrink_slab+0x32b/0x12a0 mm/shrinker.c:664 shrink_one+0x47e/0x7b0 mm/vmscan.c:4824 shrink_many mm/vmscan.c:4885 [inline] lru_gen_shrink_node mm/vmscan.c:4963 [inline] shrink_node+0xb23/0x3a90 mm/vmscan.c:5943 kswapd_shrink_node mm/vmscan.c:6771 [inline] balance_pgdat+0xc1f/0x18f0 mm/vmscan.c:6963 kswapd+0x5ea/0xbf0 mm/vmscan.c:7232 kthread+0x2c4/0x3a0 kernel/kthread.c:389 ret_from_fork+0x48/0x80 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:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x250b/0x3ce0 kernel/locking/lockdep.c:5202 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5825 __fs_reclaim_acquire mm/page_alloc.c:3836 [inline] fs_reclaim_acquire+0x102/0x150 mm/page_alloc.c:3850 might_alloc include/linux/sched/mm.h:318 [inline] slab_pre_alloc_hook mm/slub.c:4036 [inline] slab_alloc_node mm/slub.c:4114 [inline] __do_kmalloc_node mm/slub.c:4263 [inline] __kmalloc_noprof+0xb1/0x400 mm/slub.c:4276 kmalloc_noprof include/linux/slab.h:882 [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:341 vfs_listxattr+0xba/0x140 fs/xattr.c:493 listxattr+0x69/0x190 fs/xattr.c:841 path_listxattr+0xc0/0x160 fs/xattr.c:865 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_dir_ilock_class); lock(fs_reclaim); lock(&xfs_dir_ilock_class); lock(fs_reclaim); *** DEADLOCK *** 1 lock held by syz.8.662/10149: #0: ffff88805a939858 (&xfs_dir_ilock_class){++++}-{3:3}, at: xfs_ilock+0xf5/0x210 fs/xfs/xfs_inode.c:166 stack backtrace: CPU: 1 UID: 0 PID: 10149 Comm: syz.8.662 Not tainted 6.12.0-rc7-syzkaller-00042-gf1b785f4c787 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x41c/0x610 kernel/locking/lockdep.c:2074 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x250b/0x3ce0 kernel/locking/lockdep.c:5202 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5825 __fs_reclaim_acquire mm/page_alloc.c:3836 [inline] fs_reclaim_acquire+0x102/0x150 mm/page_alloc.c:3850 might_alloc include/linux/sched/mm.h:318 [inline] slab_pre_alloc_hook mm/slub.c:4036 [inline] slab_alloc_node mm/slub.c:4114 [inline] __do_kmalloc_node mm/slub.c:4263 [inline] __kmalloc_noprof+0xb1/0x400 mm/slub.c:4276 kmalloc_noprof include/linux/slab.h:882 [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:341 vfs_listxattr+0xba/0x140 fs/xattr.c:493 listxattr+0x69/0x190 fs/xattr.c:841 path_listxattr+0xc0/0x160 fs/xattr.c:865 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: 0033:0x7f81fa37e719 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:00007f81fb1cf038 EFLAGS: 00000246 ORIG_RAX: 00000000000000c2 RAX: ffffffffffffffda RBX: 00007f81fa535f80 RCX: 00007f81fa37e719 RDX: 0000000000000014 RSI: 0000000020000480 RDI: 0000000020000440 RBP: 00007f81fa3f175e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f81fa535f80 R15: 00007ffe5f9dc7d8 </TASK> --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
