syzbot

==================================================================
BUG: KCSAN: data-race in drain_all_stock / drain_stock

write to 0xffff888237c283e8 of 8 bytes by interrupt on cpu 0:
 drain_stock+0x88/0xf0 mm/memcontrol.c:2263
 __refill_stock mm/memcontrol.c:2299 [inline]
 refill_stock+0x85/0x130 mm/memcontrol.c:2314
 obj_cgroup_uncharge_pages+0x75/0x130 mm/memcontrol.c:3074
 refill_obj_stock+0x16d/0x1e0 mm/memcontrol.c:3345
 obj_cgroup_uncharge+0xa/0x10 mm/memcontrol.c:3394
 memcg_slab_free_hook+0x6e/0xe0 mm/slab.h:569
 __cache_free mm/slab.c:3372 [inline]
 __do_kmem_cache_free mm/slab.c:3585 [inline]
 kmem_cache_free+0xab/0x1b0 mm/slab.c:3610
 ext4_free_in_core_inode+0x4f/0x80 fs/ext4/super.c:1373
 i_callback+0x2e/0x60 fs/inode.c:248
 rcu_do_batch kernel/rcu/tree.c:2250 [inline]
 rcu_core+0x5ad/0xc10 kernel/rcu/tree.c:2510
 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2527
 __do_softirq+0xf2/0x2c7 kernel/softirq.c:571
 run_ksoftirqd+0x1f/0x30 kernel/softirq.c:934
 smpboot_thread_fn+0x308/0x4a0 kernel/smpboot.c:164
 kthread+0x1a9/0x1e0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

read to 0xffff888237c283e8 of 8 bytes by task 29297 on cpu 1:
 drain_all_stock+0xb3/0x2b0 mm/memcontrol.c:2343
 memory_max_write+0xe8/0x290 mm/memcontrol.c:6442
 cgroup_file_write+0x167/0x300 kernel/cgroup/cgroup.c:4057
 kernfs_fop_write_iter+0x1d3/0x2c0 fs/kernfs/file.c:330
 call_write_iter include/linux/fs.h:2199 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x468/0x760 fs/read_write.c:584
 ksys_write+0xe8/0x1a0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:646
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0xffff888139acd000 -> 0xffff8881398a1000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 29297 Comm: syz-executor.3 Not tainted 6.1.0-rc7-syzkaller-00101-g01f856ae6d0c-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
==================================================================
syz-executor.3 invoked oom-killer: gfp_mask=0xcc0(GFP_KERNEL), order=0, oom_score_adj=1000
CPU: 0 PID: 29297 Comm: syz-executor.3 Not tainted 6.1.0-rc7-syzkaller-00101-g01f856ae6d0c-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd6/0x122 lib/dump_stack.c:106
 dump_stack+0x11/0x13 lib/dump_stack.c:113
 dump_header+0x98/0x430 mm/oom_kill.c:460
 out_of_memory+0x65e/0x880 mm/oom_kill.c:1163
 mem_cgroup_out_of_memory+0x13a/0x180 mm/memcontrol.c:1706
 memory_max_write+0x1fa/0x290 mm/memcontrol.c:6455
 cgroup_file_write+0x167/0x300 kernel/cgroup/cgroup.c:4057
 kernfs_fop_write_iter+0x1d3/0x2c0 fs/kernfs/file.c:330
 call_write_iter include/linux/fs.h:2199 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x468/0x760 fs/read_write.c:584
 ksys_write+0xe8/0x1a0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:646
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fec0af8a0d9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fec0a2fd168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fec0b0a9f80 RCX: 00007fec0af8a0d9
RDX: 0000000000000012 RSI: 0000000020000080 RDI: 0000000000000006
RBP: 00007fec0afe5ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffef2545dcf R14: 00007fec0a2fd300 R15: 0000000000022000
 </TASK>
memory: usage 10200kB, limit 0kB, failcnt 218
swap: usage 0kB, limit 9007199254740988kB, failcnt 0
Memory cgroup stats for /syz1:
anon 0
file 10412032
kernel 32768
kernel_stack 0
pagetables 0
sec_pagetables 0
percpu 0
sock 0
vmalloc 0
shmem 10412032
file_mapped 147456
file_dirty 0
file_writeback 0
swapcached 0
inactive_anon 0
active_anon 10412032
inactive_file 0
active_file 0
unevictable 0
slab_reclaimable 29688
slab_unreclaimable 0
slab 29688
workingset_refault_anon 0
workingset_refault_file 53
workingset_activate_anon 0
workingset_activate_file 0
Out of memory and no killable processes...