syzbot

======================================================
WARNING: possible circular locking dependency detected
6.11.0-rc2-syzkaller-00004-gb446a2dae984 #0 Not tainted
------------------------------------------------------
kswapd0/90 is trying to acquire lock:
ffff88802d440920 (&(imap->im_aglock[index])){+.+.}-{3:3}, at: diFree+0x37c/0x2fb0 fs/jfs/jfs_imap.c:889

but task is already holding lock:
ffffffff8e82e3e0 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:6841 [inline]
ffffffff8e82e3e0 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0xb06/0x2e80 mm/vmscan.c:7223

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (fs_reclaim){+.+.}-{0:0}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
       __fs_reclaim_acquire mm/page_alloc.c:3823 [inline]
       fs_reclaim_acquire+0x88/0x140 mm/page_alloc.c:3837
       might_alloc include/linux/sched/mm.h:334 [inline]
       prepare_alloc_pages+0x147/0x5d0 mm/page_alloc.c:4471
       __alloc_pages_noprof+0x166/0x6c0 mm/page_alloc.c:4689
       __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
       alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
       ___kmalloc_large_node+0x8b/0x1d0 mm/slub.c:4103
       __kmalloc_large_noprof+0x1f/0x80 mm/slub.c:4120
       kmalloc_noprof include/linux/slab.h:678 [inline]
       diMount+0x29/0x870 fs/jfs/jfs_imap.c:105
       jfs_mount_rw+0x2da/0x6a0 fs/jfs/jfs_mount.c:240
       jfs_remount+0x3d1/0x6b0 fs/jfs/super.c:454
       reconfigure_super+0x445/0x880 fs/super.c:1083
       vfs_cmd_reconfigure fs/fsopen.c:263 [inline]
       vfs_fsconfig_locked fs/fsopen.c:292 [inline]
       __do_sys_fsconfig fs/fsopen.c:473 [inline]
       __se_sys_fsconfig+0xb6e/0xf80 fs/fsopen.c:345
       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

-> #1 (&jfs_ip->rdwrlock/1){++++}-{3:3}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
       down_read_nested+0xb5/0xa50 kernel/locking/rwsem.c:1651
       diAlloc+0x797/0x1760 fs/jfs/jfs_imap.c:1388
       ialloc+0x8f/0x900 fs/jfs/jfs_inode.c:56
       jfs_create+0x1be/0xbb0 fs/jfs/namei.c:92
       lookup_open fs/namei.c:3578 [inline]
       open_last_lookups fs/namei.c:3647 [inline]
       path_openat+0x1a9a/0x3470 fs/namei.c:3883
       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_open fs/open.c:1439 [inline]
       __se_sys_open fs/open.c:1435 [inline]
       __x64_sys_open+0x225/0x270 fs/open.c:1435
       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

-> #0 (&(imap->im_aglock[index])){+.+.}-{3:3}:
       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
       __mutex_lock_common kernel/locking/mutex.c:608 [inline]
       __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
       diFree+0x37c/0x2fb0 fs/jfs/jfs_imap.c:889
       jfs_evict_inode+0x32d/0x440 fs/jfs/inode.c:156
       evict+0x2a8/0x630 fs/inode.c:669
       __dentry_kill+0x20d/0x630 fs/dcache.c:610
       shrink_kill+0xa9/0x2c0 fs/dcache.c:1055
       shrink_dentry_list+0x2c0/0x5b0 fs/dcache.c:1082
       prune_dcache_sb+0x10f/0x180 fs/dcache.c:1163
       super_cache_scan+0x34f/0x4b0 fs/super.c:221
       do_shrink_slab+0x701/0x1160 mm/shrinker.c:435
       shrink_slab_memcg mm/shrinker.c:548 [inline]
       shrink_slab+0x878/0x14c0 mm/shrinker.c:626
       shrink_node_memcgs mm/vmscan.c:5910 [inline]
       shrink_node+0x130f/0x2df0 mm/vmscan.c:5948
       kswapd_shrink_node mm/vmscan.c:6762 [inline]
       balance_pgdat mm/vmscan.c:6954 [inline]
       kswapd+0x191b/0x2e80 mm/vmscan.c:7223
       kthread+0x2f0/0x390 kernel/kthread.c:389
       ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

other info that might help us debug this:

Chain exists of:
  &(imap->im_aglock[index]) --> &jfs_ip->rdwrlock/1 --> fs_reclaim

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(fs_reclaim);
                               lock(&jfs_ip->rdwrlock/1);
                               lock(fs_reclaim);
  lock(&(imap->im_aglock[index]));

 *** DEADLOCK ***

2 locks held by kswapd0/90:
 #0: ffffffff8e82e3e0 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:6841 [inline]
 #0: ffffffff8e82e3e0 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0xb06/0x2e80 mm/vmscan.c:7223
 #1: ffff88807d1ae0e0 (&type->s_umount_key#103){++++}-{3:3}, at: super_trylock_shared fs/super.c:562 [inline]
 #1: ffff88807d1ae0e0 (&type->s_umount_key#103){++++}-{3:3}, at: super_cache_scan+0x94/0x4b0 fs/super.c:196

stack backtrace:
CPU: 0 UID: 0 PID: 90 Comm: kswapd0 Not tainted 6.11.0-rc2-syzkaller-00004-gb446a2dae984 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
 <TASK>
 __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
 __mutex_lock_common kernel/locking/mutex.c:608 [inline]
 __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
 diFree+0x37c/0x2fb0 fs/jfs/jfs_imap.c:889
 jfs_evict_inode+0x32d/0x440 fs/jfs/inode.c:156
 evict+0x2a8/0x630 fs/inode.c:669
 __dentry_kill+0x20d/0x630 fs/dcache.c:610
 shrink_kill+0xa9/0x2c0 fs/dcache.c:1055
 shrink_dentry_list+0x2c0/0x5b0 fs/dcache.c:1082
 prune_dcache_sb+0x10f/0x180 fs/dcache.c:1163
 super_cache_scan+0x34f/0x4b0 fs/super.c:221
 do_shrink_slab+0x701/0x1160 mm/shrinker.c:435
 shrink_slab_memcg mm/shrinker.c:548 [inline]
 shrink_slab+0x878/0x14c0 mm/shrinker.c:626
 shrink_node_memcgs mm/vmscan.c:5910 [inline]
 shrink_node+0x130f/0x2df0 mm/vmscan.c:5948
 kswapd_shrink_node mm/vmscan.c:6762 [inline]
 balance_pgdat mm/vmscan.c:6954 [inline]
 kswapd+0x191b/0x2e80 mm/vmscan.c:7223
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>