------------[ cut here ]------------
current->flags & PF_MEMALLOC
WARNING: fs/ext4/inode.c:5643 at ext4_write_inode+0x544/0x620 fs/ext4/inode.c:5643, CPU#0: kswapd0/69
Modules linked in:
CPU: 0 UID: 0 PID: 69 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
RIP: 0010:ext4_write_inode+0x544/0x620 fs/ext4/inode.c:5643
Code: 8b 05 30 00 94 10 48 3b 44 24 30 75 5a 44 89 e0 48 83 c4 38 5b 41 5c 41 5d 41 5e 41 5f 5d e9 13 b9 29 09 cc e8 5d 2b 3d ff 90 <0f> 0b 90 eb cf e8 52 2b 3d ff 41 bc fb ff ff ff eb c2 e8 45 2b 3d
RSP: 0018:ffffc90000afee80 EFLAGS: 00010293
RAX: ffffffff82887013 RBX: 0000000000000800 RCX: ffff888000de2480
RDX: 0000000000000000 RSI: 0000000000000800 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff9011aab7 R09: 1ffffffff2023556
R10: dffffc0000000000 R11: ffffffff82886ad0 R12: 0000000000000000
R13: ffffc90000afefc0 R14: ffff888047e01f60 R15: ffff888000de2480
FS:  0000000000000000(0000) GS:ffff88808ca59000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdfa31c99a0 CR3: 0000000049008000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 write_inode fs/fs-writeback.c:1582 [inline]
 __writeback_single_inode+0x75a/0x11a0 fs/fs-writeback.c:1813
 writeback_single_inode+0x4ac/0xdc0 fs/fs-writeback.c:1869
 write_inode_now+0x1c2/0x290 fs/fs-writeback.c:2954
 iput_final fs/inode.c:1956 [inline]
 iput+0x8c1/0xe80 fs/inode.c:2015
 __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:223
 do_shrink_slab+0x6df/0x1170 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:4928
 shrink_many mm/vmscan.c:4989 [inline]
 lru_gen_shrink_node mm/vmscan.c:5067 [inline]
 shrink_node+0x3197/0x3a90 mm/vmscan.c:6047
 kswapd_shrink_node mm/vmscan.c:6894 [inline]
 balance_pgdat mm/vmscan.c:7070 [inline]
 kswapd+0x1742/0x2e10 mm/vmscan.c:7343
 kthread+0x388/0x470 kernel/kthread.c:467
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>