Hello, syzbot found the following issue on: HEAD commit: 977b1ef51866 Merge tag 'block-6.9-20240420' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=126497cd180000 kernel config: https://syzkaller.appspot.com/x/.config?x=d239903bd07761e5 dashboard link: https://syzkaller.appspot.com/bug?extid=b7e8d799f0ab724876f9 compiler: Debian clang version 15.0.6, 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/08d7b6e107aa/disk-977b1ef5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9c5e543ffdcf/vmlinux-977b1ef5.xz kernel image: https://storage.googleapis.com/syzbot-assets/04a6d79d2f69/bzImage-977b1ef5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b7e8d799f0ab724876f9@xxxxxxxxxxxxxxxxxxxxxxxxx XFS (loop2): Ending clean mount ====================================================== WARNING: possible circular locking dependency detected 6.9.0-rc4-syzkaller-00266-g977b1ef51866 #0 Not tainted ------------------------------------------------------ syz-executor.2/7915 is trying to acquire lock: ffffffff8e42a800 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:312 [inline] ffffffff8e42a800 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slub.c:3746 [inline] ffffffff8e42a800 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:3827 [inline] ffffffff8e42a800 (fs_reclaim){+.+.}-{0:0}, at: kmalloc_trace+0x47/0x360 mm/slub.c:3992 but task is already holding lock: ffff888056da8118 (&xfs_dir_ilock_class){++++}-{3:3}, at: xfs_ilock_data_map_shared+0x4f/0x70 fs/xfs/xfs_inode.c:114 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&xfs_dir_ilock_class){++++}-{3:3}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 down_write_nested+0x3d/0x50 kernel/locking/rwsem.c:1695 xfs_reclaim_inode fs/xfs/xfs_icache.c:945 [inline] xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1631 [inline] xfs_icwalk_ag+0x120e/0x1ad0 fs/xfs/xfs_icache.c:1713 xfs_icwalk fs/xfs/xfs_icache.c:1762 [inline] xfs_reclaim_inodes_nr+0x257/0x360 fs/xfs/xfs_icache.c:1011 super_cache_scan+0x411/0x4b0 fs/super.c:227 do_shrink_slab+0x707/0x1160 mm/shrinker.c:435 shrink_slab+0x1092/0x14d0 mm/shrinker.c:662 shrink_one+0x453/0x880 mm/vmscan.c:4774 shrink_many mm/vmscan.c:4835 [inline] lru_gen_shrink_node mm/vmscan.c:4935 [inline] shrink_node+0x3b17/0x4310 mm/vmscan.c:5894 kswapd_shrink_node mm/vmscan.c:6704 [inline] balance_pgdat mm/vmscan.c:6895 [inline] kswapd+0x1882/0x38a0 mm/vmscan.c:7164 kthread+0x2f2/0x390 kernel/kthread.c:388 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:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain+0x18cb/0x58e0 kernel/locking/lockdep.c:3869 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 __fs_reclaim_acquire mm/page_alloc.c:3698 [inline] fs_reclaim_acquire+0x88/0x140 mm/page_alloc.c:3712 might_alloc include/linux/sched/mm.h:312 [inline] slab_pre_alloc_hook mm/slub.c:3746 [inline] slab_alloc_node mm/slub.c:3827 [inline] kmalloc_trace+0x47/0x360 mm/slub.c:3992 kmalloc include/linux/slab.h:628 [inline] add_stack_record_to_list mm/page_owner.c:177 [inline] inc_stack_record_count mm/page_owner.c:219 [inline] __set_page_owner+0x561/0x810 mm/page_owner.c:334 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0x3410/0x35b0 mm/page_alloc.c:3317 __alloc_pages+0x256/0x6c0 mm/page_alloc.c:4575 __alloc_pages_bulk+0x729/0xd40 mm/page_alloc.c:4523 alloc_pages_bulk_array include/linux/gfp.h:202 [inline] xfs_buf_alloc_pages+0x1a7/0x860 fs/xfs/xfs_buf.c:398 xfs_buf_find_insert+0x19a/0x1540 fs/xfs/xfs_buf.c:650 xfs_buf_get_map+0x149c/0x1ae0 fs/xfs/xfs_buf.c:755 xfs_buf_read_map+0x111/0xa60 fs/xfs/xfs_buf.c:860 xfs_trans_read_buf_map+0x260/0xad0 fs/xfs/xfs_trans_buf.c:289 xfs_da_read_buf+0x2b1/0x470 fs/xfs/libxfs/xfs_da_btree.c:2674 xfs_dir3_block_read+0x92/0x1a0 fs/xfs/libxfs/xfs_dir2_block.c:145 xfs_dir2_block_lookup_int+0x109/0x7d0 fs/xfs/libxfs/xfs_dir2_block.c:700 xfs_dir2_block_lookup+0x19a/0x630 fs/xfs/libxfs/xfs_dir2_block.c:650 xfs_dir_lookup+0x633/0xaf0 fs/xfs/libxfs/xfs_dir2.c:399 xfs_lookup+0x298/0x550 fs/xfs/xfs_inode.c:640 xfs_vn_lookup+0x192/0x290 fs/xfs/xfs_iops.c:303 lookup_open fs/namei.c:3475 [inline] open_last_lookups fs/namei.c:3566 [inline] path_openat+0x1035/0x3240 fs/namei.c:3796 do_filp_open+0x235/0x490 fs/namei.c:3826 do_sys_openat2+0x13e/0x1d0 fs/open.c:1406 do_sys_open fs/open.c:1421 [inline] __do_sys_openat fs/open.c:1437 [inline] __se_sys_openat fs/open.c:1432 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1432 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 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 *** 3 locks held by syz-executor.2/7915: #0: ffff8881d0472420 (sb_writers#14){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:409 #1: ffff888056da8338 (&inode->i_sb->s_type->i_mutex_dir_key){++++}-{3:3}, at: inode_lock include/linux/fs.h:795 [inline] #1: ffff888056da8338 (&inode->i_sb->s_type->i_mutex_dir_key){++++}-{3:3}, at: open_last_lookups fs/namei.c:3563 [inline] #1: ffff888056da8338 (&inode->i_sb->s_type->i_mutex_dir_key){++++}-{3:3}, at: path_openat+0x7d3/0x3240 fs/namei.c:3796 #2: ffff888056da8118 (&xfs_dir_ilock_class){++++}-{3:3}, at: xfs_ilock_data_map_shared+0x4f/0x70 fs/xfs/xfs_inode.c:114 stack backtrace: CPU: 1 PID: 7915 Comm: syz-executor.2 Not tainted 6.9.0-rc4-syzkaller-00266-g977b1ef51866 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 check_noncircular+0x36a/0x4a0 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+0x18cb/0x58e0 kernel/locking/lockdep.c:3869 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 __fs_reclaim_acquire mm/page_alloc.c:3698 [inline] fs_reclaim_acquire+0x88/0x140 mm/page_alloc.c:3712 might_alloc include/linux/sched/mm.h:312 [inline] slab_pre_alloc_hook mm/slub.c:3746 [inline] slab_alloc_node mm/slub.c:3827 [inline] kmalloc_trace+0x47/0x360 mm/slub.c:3992 kmalloc include/linux/slab.h:628 [inline] add_stack_record_to_list mm/page_owner.c:177 [inline] inc_stack_record_count mm/page_owner.c:219 [inline] __set_page_owner+0x561/0x810 mm/page_owner.c:334 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0x3410/0x35b0 mm/page_alloc.c:3317 __alloc_pages+0x256/0x6c0 mm/page_alloc.c:4575 __alloc_pages_bulk+0x729/0xd40 mm/page_alloc.c:4523 alloc_pages_bulk_array include/linux/gfp.h:202 [inline] xfs_buf_alloc_pages+0x1a7/0x860 fs/xfs/xfs_buf.c:398 xfs_buf_find_insert+0x19a/0x1540 fs/xfs/xfs_buf.c:650 xfs_buf_get_map+0x149c/0x1ae0 fs/xfs/xfs_buf.c:755 xfs_buf_read_map+0x111/0xa60 fs/xfs/xfs_buf.c:860 xfs_trans_read_buf_map+0x260/0xad0 fs/xfs/xfs_trans_buf.c:289 xfs_da_read_buf+0x2b1/0x470 fs/xfs/libxfs/xfs_da_btree.c:2674 xfs_dir3_block_read+0x92/0x1a0 fs/xfs/libxfs/xfs_dir2_block.c:145 xfs_dir2_block_lookup_int+0x109/0x7d0 fs/xfs/libxfs/xfs_dir2_block.c:700 xfs_dir2_block_lookup+0x19a/0x630 fs/xfs/libxfs/xfs_dir2_block.c:650 xfs_dir_lookup+0x633/0xaf0 fs/xfs/libxfs/xfs_dir2.c:399 xfs_lookup+0x298/0x550 fs/xfs/xfs_inode.c:640 xfs_vn_lookup+0x192/0x290 fs/xfs/xfs_iops.c:303 lookup_open fs/namei.c:3475 [inline] open_last_lookups fs/namei.c:3566 [inline] path_openat+0x1035/0x3240 fs/namei.c:3796 do_filp_open+0x235/0x490 fs/namei.c:3826 do_sys_openat2+0x13e/0x1d0 fs/open.c:1406 do_sys_open fs/open.c:1421 [inline] __do_sys_openat fs/open.c:1437 [inline] __se_sys_openat fs/open.c:1432 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1432 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f23c887dea9 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:00007f23c95950c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f23c89abf80 RCX: 00007f23c887dea9 RDX: 000000000000275a RSI: 0000000020000080 RDI: ffffffffffffff9c RBP: 00007f23c88ca4a4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f23c89abf80 R15: 00007fff62a26428 </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
