====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ kswapd0/72 is trying to acquire lock: ffff888037ad8920 (&(imap->im_aglock[index])){+.+.}-{4:4}, at: diFree+0x2e9/0x2ca0 fs/jfs/jfs_imap.c:889 but task is already holding lock: ffffffff8e67e8a0 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:6975 [inline] ffffffff8e67e8a0 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0x90d/0x2800 mm/vmscan.c:7354 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (fs_reclaim){+.+.}-{0:0}: __fs_reclaim_acquire mm/page_alloc.c:4331 [inline] fs_reclaim_acquire+0x71/0x100 mm/page_alloc.c:4345 might_alloc include/linux/sched/mm.h:317 [inline] slab_pre_alloc_hook mm/slub.c:4904 [inline] slab_alloc_node mm/slub.c:5239 [inline] __do_kmalloc_node mm/slub.c:5656 [inline] __kmalloc_noprof+0x9c/0x7e0 mm/slub.c:5669 kmalloc_noprof include/linux/slab.h:961 [inline] __jfs_set_acl+0x9d/0x1c0 fs/jfs/acl.c:80 jfs_set_acl+0x1da/0x320 fs/jfs/acl.c:115 set_posix_acl fs/posix_acl.c:954 [inline] vfs_set_acl+0x87d/0xb00 fs/posix_acl.c:1133 do_set_acl+0xf5/0x190 fs/posix_acl.c:1278 do_setxattr fs/xattr.c:633 [inline] filename_setxattr+0x2fc/0x630 fs/xattr.c:665 path_setxattrat+0x3f3/0x430 fs/xattr.c:713 __do_sys_setxattr fs/xattr.c:747 [inline] __se_sys_setxattr fs/xattr.c:743 [inline] __x64_sys_setxattr+0xbc/0xe0 fs/xattr.c:743 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (&jfs_ip->commit_mutex){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:614 [inline] __mutex_lock+0x19f/0x1300 kernel/locking/mutex.c:776 diNewIAG fs/jfs/jfs_imap.c:2522 [inline] diAllocExt fs/jfs/jfs_imap.c:1905 [inline] diAllocAG+0x145b/0x1db0 fs/jfs/jfs_imap.c:1669 diAlloc+0x1d5/0x1680 fs/jfs/jfs_imap.c:1590 ialloc+0x8c/0x8f0 fs/jfs/jfs_inode.c:56 jfs_mkdir+0x1e1/0xb00 fs/jfs/namei.c:225 vfs_mkdir+0x753/0x870 fs/namei.c:5139 do_mkdirat+0x27d/0x4b0 fs/namei.c:5173 __do_sys_mkdirat fs/namei.c:5195 [inline] __se_sys_mkdirat fs/namei.c:5193 [inline] __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:5193 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&jfs_ip->rdwrlock/1){++++}-{4:4}: down_read_nested+0x49/0x2e0 kernel/locking/rwsem.c:1662 diAlloc+0x795/0x1680 fs/jfs/jfs_imap.c:1388 ialloc+0x8c/0x8f0 fs/jfs/jfs_inode.c:56 jfs_create+0x1da/0xb10 fs/jfs/namei.c:92 lookup_open fs/namei.c:4449 [inline] open_last_lookups fs/namei.c:4549 [inline] path_openat+0x18dd/0x3e20 fs/namei.c:4793 do_filp_open+0x22d/0x490 fs/namei.c:4823 do_sys_openat2+0x12f/0x220 fs/open.c:1430 do_sys_open fs/open.c:1436 [inline] __do_sys_openat fs/open.c:1452 [inline] __se_sys_openat fs/open.c:1447 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1447 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&(imap->im_aglock[index])){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x330 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:614 [inline] __mutex_lock+0x19f/0x1300 kernel/locking/mutex.c:776 diFree+0x2e9/0x2ca0 fs/jfs/jfs_imap.c:889 jfs_evict_inode+0x331/0x440 fs/jfs/inode.c:162 evict+0x61e/0xb10 fs/inode.c:837 __dentry_kill+0x1a2/0x5e0 fs/dcache.c:670 shrink_kill+0xa9/0x2c0 fs/dcache.c:1147 shrink_dentry_list+0x2e0/0x5e0 fs/dcache.c:1174 prune_dcache_sb+0x119/0x180 fs/dcache.c:1256 super_cache_scan+0x369/0x4b0 fs/super.c:222 do_shrink_slab+0x6df/0x10d0 mm/shrinker.c:437 shrink_slab_memcg mm/shrinker.c:550 [inline] shrink_slab+0x830/0x1150 mm/shrinker.c:628 shrink_one+0x2d9/0x710 mm/vmscan.c:4921 shrink_many mm/vmscan.c:4982 [inline] lru_gen_shrink_node mm/vmscan.c:5060 [inline] shrink_node+0x2f8b/0x35f0 mm/vmscan.c:6047 kswapd_shrink_node mm/vmscan.c:6901 [inline] balance_pgdat mm/vmscan.c:7084 [inline] kswapd+0x144c/0x2800 mm/vmscan.c:7354 kthread+0x726/0x8b0 kernel/kthread.c:463 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 other info that might help us debug this: Chain exists of: &(imap->im_aglock[index]) --> &jfs_ip->commit_mutex --> fs_reclaim Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(fs_reclaim); lock(&jfs_ip->commit_mutex); lock(fs_reclaim); lock(&(imap->im_aglock[index])); *** DEADLOCK *** 2 locks held by kswapd0/72: #0: ffffffff8e67e8a0 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:6975 [inline] #0: ffffffff8e67e8a0 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0x90d/0x2800 mm/vmscan.c:7354 #1: ffff88804272a0e0 (&type->s_umount_key#51){.+.+}-{4:4}, at: super_trylock_shared fs/super.c:563 [inline] #1: ffff88804272a0e0 (&type->s_umount_key#51){.+.+}-{4:4}, at: super_cache_scan+0x91/0x4b0 fs/super.c:197 stack backtrace: CPU: 0 UID: 0 PID: 72 Comm: kswapd0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2043 check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x330 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:614 [inline] __mutex_lock+0x19f/0x1300 kernel/locking/mutex.c:776 diFree+0x2e9/0x2ca0 fs/jfs/jfs_imap.c:889 jfs_evict_inode+0x331/0x440 fs/jfs/inode.c:162 evict+0x61e/0xb10 fs/inode.c:837 __dentry_kill+0x1a2/0x5e0 fs/dcache.c:670 shrink_kill+0xa9/0x2c0 fs/dcache.c:1147 shrink_dentry_list+0x2e0/0x5e0 fs/dcache.c:1174 prune_dcache_sb+0x119/0x180 fs/dcache.c:1256 super_cache_scan+0x369/0x4b0 fs/super.c:222 do_shrink_slab+0x6df/0x10d0 mm/shrinker.c:437 shrink_slab_memcg mm/shrinker.c:550 [inline] shrink_slab+0x830/0x1150 mm/shrinker.c:628 shrink_one+0x2d9/0x710 mm/vmscan.c:4921 shrink_many mm/vmscan.c:4982 [inline] lru_gen_shrink_node mm/vmscan.c:5060 [inline] shrink_node+0x2f8b/0x35f0 mm/vmscan.c:6047 kswapd_shrink_node mm/vmscan.c:6901 [inline] balance_pgdat mm/vmscan.c:7084 [inline] kswapd+0x144c/0x2800 mm/vmscan.c:7354 kthread+0x726/0x8b0 kernel/kthread.c:463 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246