==================================================================
BUG: KASAN: use-after-free in atomic64_read include/asm-generic/atomic-instrumented.h:836 [inline]
BUG: KASAN: use-after-free in atomic_long_read include/asm-generic/atomic-long.h:28 [inline]
BUG: KASAN: use-after-free in filp_close+0x31/0x140 fs/open.c:1164
Read of size 8 at addr ffff8881e9dbbb78 by task syz-executor656/358

CPU: 1 PID: 358 Comm: syz-executor656 Not tainted 5.4.88-syzkaller-00116-gc9951e5d80dd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1dd/0x24e lib/dump_stack.c:118
 print_address_description+0x96/0x640 mm/kasan/report.c:374
 __kasan_report+0x177/0x1f0 mm/kasan/report.c:506
 kasan_report+0x30/0x60 mm/kasan/common.c:634
 check_memory_region_inline mm/kasan/generic.c:181 [inline]
 check_memory_region+0x2b5/0x2f0 mm/kasan/generic.c:191
 atomic64_read include/asm-generic/atomic-instrumented.h:836 [inline]
 atomic_long_read include/asm-generic/atomic-long.h:28 [inline]
 filp_close+0x31/0x140 fs/open.c:1164
 __do_sys_close fs/open.c:1189 [inline]
 __se_sys_close fs/open.c:1187 [inline]
 __x64_sys_close+0x62/0xb0 fs/open.c:1187
 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x400f30
Code: 01 f0 ff ff 0f 83 20 0c 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d 9d 17 2d 00 00 75 14 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 f4 0b 00 00 c3 48 83 ec 08 e8 5a 01 00 00
RSP: 002b:00007fff0b9dea78 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000400f30
RDX: 0000000020000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 00007fff0b9dea80 R08: 0000000000000004 R09: 0000000120080522
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a22b0
R13: 0000000000402040 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 358:
 save_stack mm/kasan/common.c:69 [inline]
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc+0x129/0x1c0 mm/kasan/common.c:510
 slab_post_alloc_hook mm/slab.h:584 [inline]
 slab_alloc_node mm/slub.c:2803 [inline]
 slab_alloc mm/slub.c:2811 [inline]
 kmem_cache_alloc+0x1e0/0x270 mm/slub.c:2816
 kmem_cache_zalloc include/linux/slab.h:680 [inline]
 __alloc_file+0x26/0x390 fs/file_table.c:101
 alloc_empty_file+0xa9/0x1b0 fs/file_table.c:151
 path_openat+0x11b/0x3c20 fs/namei.c:3601
 do_filp_open+0x20a/0x440 fs/namei.c:3642
 do_sys_open+0x380/0x7b0 fs/open.c:1093
 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 358:
 save_stack mm/kasan/common.c:69 [inline]
 set_track mm/kasan/common.c:77 [inline]
 kasan_set_free_info mm/kasan/common.c:332 [inline]
 __kasan_slab_free+0x17e/0x230 mm/kasan/common.c:471
 slab_free_hook mm/slub.c:1453 [inline]
 slab_free_freelist_hook+0xd0/0x150 mm/slub.c:1486
 slab_free mm/slub.c:3051 [inline]
 kfree+0x12c/0x660 mm/slub.c:4017
 put_fs_context+0x57c/0x690 fs/fs_context.c:509
 fscontext_release+0x61/0x80 fs/fsopen.c:73
 __fput+0x27d/0x6c0 fs/file_table.c:281
 task_work_run+0x176/0x1a0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop arch/x86/entry/common.c:163 [inline]
 prepare_exit_to_usermode+0x2b0/0x310 arch/x86/entry/common.c:194
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff8881e9dbbb40
 which belongs to the cache filp of size 256
The buggy address is located 56 bytes inside of
 256-byte region [ffff8881e9dbbb40, ffff8881e9dbbc40)
The buggy address belongs to the page:
page:ffffea0007a76ec0 refcount:1 mapcount:0 mapping:ffff8881f60fa780 index:0x0
flags: 0x8000000000000200(slab)
raw: 8000000000000200 0000000000000000 0000000100000001 ffff8881f60fa780
raw: 0000000000000000 00000000800c000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881e9dbba00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881e9dbba80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881e9dbbb00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
                                                                ^
 ffff8881e9dbbb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881e9dbbc00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
CPU: 1 PID: 358 Comm: syz-executor656 Tainted: G    B             5.4.88-syzkaller-00116-gc9951e5d80dd #0
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1dd/0x24e lib/dump_stack.c:118
 panic+0x285/0x750 kernel/panic.c:221
 end_report mm/kasan/report.c:96 [inline]
 __kasan_report+0x1e8/0x1f0 mm/kasan/report.c:513
 kasan_report+0x30/0x60 mm/kasan/common.c:634
 atomic64_read include/asm-generic/atomic-instrumented.h:836 [inline]
 atomic_long_read include/asm-generic/atomic-long.h:28 [inline]
 filp_close+0x31/0x140 fs/open.c:1164
 __do_sys_close fs/open.c:1189 [inline]
 __se_sys_close fs/open.c:1187 [inline]
 __x64_sys_close+0x62/0xb0 fs/open.c:1187
 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x400f30
Code: 01 f0 ff ff 0f 83 20 0c 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 83 3d 9d 17 2d 00 00 75 14 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 f4 0b 00 00 c3 48 83 ec 08 e8 5a 01 00 00
RSP: 002b:00007fff0b9dea78 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000400f30
RDX: 0000000020000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 00007fff0b9dea80 R08: 0000000000000004 R09: 0000000120080522
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a22b0
R13: 0000000000402040 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..