Date:   Mon, 28 Mar 2022 01:59:19 -0700
From:   syzbot <syzbot+36c6631f1635a4a9c63a@...kaller.appspotmail.com>
To:     agruenba@...hat.com, cluster-devel@...hat.com,
        linux-kernel@...r.kernel.org, rpeterso@...hat.com,
        syzkaller-bugs@...glegroups.com
Subject: [syzbot] KASAN: use-after-free Read in qd_unlock

Hello,

syzbot found the following issue on:

HEAD commit:    1bc191051dca Merge tag 'trace-v5.18' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=110faa75700000
kernel config:  https://syzkaller.appspot.com/x/.config?x=70f8915481c02c4
dashboard link: https://syzkaller.appspot.com/bug?extid=36c6631f1635a4a9c63a
compiler:       Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+36c6631f1635a4a9c63a@...kaller.appspotmail.com

RSP: 002b:00007ffc995fc558 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f436088a4b7
RDX: 00007ffc995fc62c RSI: 000000000000000a RDI: 00007ffc995fc620
RBP: 00007ffc995fc620 R08: 00000000ffffffff R09: 00007ffc995fc3f0
R10: 0000555555cfb8b3 R11: 0000000000000246 R12: 00007f43608e21ea
R13: 00007ffc995fd6e0 R14: 0000555555cfb810 R15: 00007ffc995fd720
 </TASK>
==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:71 [inline]
BUG: KASAN: use-after-free in test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
BUG: KASAN: use-after-free in qd_unlock+0x30/0x2d0 fs/gfs2/quota.c:486
Read of size 8 at addr ffff88802a3bf330 by task syz-executor.4/3635

CPU: 1 PID: 3635 Comm: syz-executor.4 Tainted: G        W         5.17.0-syzkaller-02237-g1bc191051dca #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106
 print_address_description+0x64/0x400 mm/kasan/report.c:255
 __kasan_report mm/kasan/report.c:442 [inline]
 kasan_report+0x19a/0x1f0 mm/kasan/report.c:459
 kasan_check_range+0x2b5/0x2f0 mm/kasan/generic.c:189
 instrument_atomic_read include/linux/instrumented.h:71 [inline]
 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
 qd_unlock+0x30/0x2d0 fs/gfs2/quota.c:486
 gfs2_quota_sync+0x69f/0x7f0 fs/gfs2/quota.c:1317
 gfs2_sync_fs+0x49/0xb0 fs/gfs2/super.c:642
 sync_filesystem+0xe8/0x220 fs/sync.c:56
 generic_shutdown_super+0x6b/0x300 fs/super.c:445
 kill_block_super+0x79/0xd0 fs/super.c:1394
 deactivate_locked_super+0xa7/0xf0 fs/super.c:332
 cleanup_mnt+0x462/0x510 fs/namespace.c:1173
 task_work_run+0x146/0x1c0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:190 [inline]
 exit_to_user_mode_prepare+0x1dd/0x200 kernel/entry/common.c:222
 __syscall_exit_to_user_mode_work kernel/entry/common.c:304 [inline]
 syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:315
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f436088a4b7
Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 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:00007ffc995fc558 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f436088a4b7
RDX: 00007ffc995fc62c RSI: 000000000000000a RDI: 00007ffc995fc620
RBP: 00007ffc995fc620 R08: 00000000ffffffff R09: 00007ffc995fc3f0
R10: 0000555555cfb8b3 R11: 0000000000000246 R12: 00007f43608e21ea
R13: 00007ffc995fd6e0 R14: 0000555555cfb810 R15: 00007ffc995fd720
 </TASK>

Allocated by task 4751:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:436 [inline]
 __kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:469
 kasan_slab_alloc include/linux/kasan.h:239 [inline]
 slab_post_alloc_hook mm/slab.h:749 [inline]
 slab_alloc_node mm/slub.c:3230 [inline]
 slab_alloc mm/slub.c:3238 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3245 [inline]
 kmem_cache_alloc+0x1c9/0x310 mm/slub.c:3255
 kmem_cache_zalloc include/linux/slab.h:707 [inline]
 qd_alloc+0x51/0x250 fs/gfs2/quota.c:216
 gfs2_quota_init+0x798/0x1040 fs/gfs2/quota.c:1407
 gfs2_make_fs_rw+0x4c0/0x640 fs/gfs2/super.c:153
 gfs2_fill_super+0x3663/0x4a70 fs/gfs2/ops_fstype.c:1269
 get_tree_bdev+0x406/0x630 fs/super.c:1292
 gfs2_get_tree+0x50/0x200 fs/gfs2/ops_fstype.c:1325
 vfs_get_tree+0x86/0x270 fs/super.c:1497
 do_new_mount fs/namespace.c:3026 [inline]
 path_mount+0x1986/0x2c30 fs/namespace.c:3356
 do_mount fs/namespace.c:3369 [inline]
 __do_sys_mount fs/namespace.c:3577 [inline]
 __se_sys_mount+0x308/0x3c0 fs/namespace.c:3554
 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+0x44/0xae

Freed by task 0:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4c/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x136/0x1e0 mm/kasan/common.c:366
 kasan_slab_free include/linux/kasan.h:215 [inline]
 slab_free_hook mm/slub.c:1728 [inline]
 slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1754
 slab_free mm/slub.c:3523 [inline]
 kmem_cache_free+0xc6/0x2d0 mm/slub.c:3540
 rcu_do_batch kernel/rcu/tree.c:2535 [inline]
 rcu_core+0xa85/0x1700 kernel/rcu/tree.c:2786
 __do_softirq+0x392/0x7a3 kernel/softirq.c:558

Last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:348
 call_rcu+0x163/0xa70 kernel/rcu/tree.c:3074
 gfs2_quota_cleanup+0x494/0x6f0 fs/gfs2/quota.c:1471
 gfs2_make_fs_ro+0x4ba/0x600 fs/gfs2/super.c:552
 signal_our_withdraw fs/gfs2/util.c:166 [inline]
 gfs2_withdraw+0x84f/0x1860 fs/gfs2/util.c:343
 gfs2_meta_check_ii+0x70/0x80 fs/gfs2/util.c:501
 gfs2_metatype_check_i fs/gfs2/util.h:126 [inline]
 gfs2_meta_buffer+0x321/0x400 fs/gfs2/meta_io.c:493
 gfs2_meta_inode_buffer fs/gfs2/meta_io.h:70 [inline]
 gfs2_inode_refresh+0xd6/0xdc0 fs/gfs2/glops.c:472
 inode_go_instantiate+0x87/0x3b0 fs/gfs2/glops.c:498
 gfs2_instantiate+0x1a1/0x210 fs/gfs2/glock.c:509
 do_promote+0xe0a/0x15c0 fs/gfs2/glock.c:559
 finish_xmote+0x807/0x1200 fs/gfs2/glock.c:722
 do_xmote+0xb54/0x15f0 fs/gfs2/glock.c:866
 gfs2_glock_nq+0xce7/0x1790 fs/gfs2/glock.c:1576
 gfs2_glock_nq_init fs/gfs2/glock.h:254 [inline]
 do_sync+0x5d8/0xdf0 fs/gfs2/quota.c:908
 gfs2_quota_sync+0x379/0x7f0 fs/gfs2/quota.c:1310
 gfs2_sync_fs+0x49/0xb0 fs/gfs2/super.c:642
 sync_filesystem+0xe8/0x220 fs/sync.c:56
 generic_shutdown_super+0x6b/0x300 fs/super.c:445
 kill_block_super+0x79/0xd0 fs/super.c:1394
 deactivate_locked_super+0xa7/0xf0 fs/super.c:332
 cleanup_mnt+0x462/0x510 fs/namespace.c:1173
 task_work_run+0x146/0x1c0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:190 [inline]
 exit_to_user_mode_prepare+0x1dd/0x200 kernel/entry/common.c:222
 __syscall_exit_to_user_mode_work kernel/entry/common.c:304 [inline]
 syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:315
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Second to last potentially related work creation:
 kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38
 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:348
 call_rcu+0x163/0xa70 kernel/rcu/tree.c:3074
 gfs2_quota_cleanup+0x494/0x6f0 fs/gfs2/quota.c:1471
 gfs2_make_fs_ro+0x4ba/0x600 fs/gfs2/super.c:552
 gfs2_put_super+0x256/0x860 fs/gfs2/super.c:587
 generic_shutdown_super+0x128/0x300 fs/super.c:462
 kill_block_super+0x79/0xd0 fs/super.c:1394
 deactivate_locked_super+0xa7/0xf0 fs/super.c:332
 cleanup_mnt+0x462/0x510 fs/namespace.c:1173
 task_work_run+0x146/0x1c0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:190 [inline]
 exit_to_user_mode_prepare+0x1dd/0x200 kernel/entry/common.c:222
 __syscall_exit_to_user_mode_work kernel/entry/common.c:304 [inline]
 syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:315
 entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff88802a3bf2a0
 which belongs to the cache gfs2_quotad of size 272
The buggy address is located 144 bytes inside of
 272-byte region [ffff88802a3bf2a0, ffff88802a3bf3b0)
The buggy address belongs to the page:
page:ffffea0000a8efc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2a3bf
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea0000b983c0 dead000000000002 ffff888018a82640
raw: 0000000000000000 00000000800c000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x112c50(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 2497, ts 1007566952843, free_ts 975272292210
 prep_new_page mm/page_alloc.c:2382 [inline]
 get_page_from_freelist+0x708/0xa80 mm/page_alloc.c:4123
 __alloc_pages+0x255/0x580 mm/page_alloc.c:5349
 alloc_slab_page+0x70/0xf0 mm/slub.c:1799
 allocate_slab+0x5d/0x380 mm/slub.c:1944
 new_slab mm/slub.c:2004 [inline]
 ___slab_alloc+0x40e/0xcc0 mm/slub.c:3018
 __slab_alloc mm/slub.c:3105 [inline]
 slab_alloc_node mm/slub.c:3196 [inline]
 slab_alloc mm/slub.c:3238 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3245 [inline]
 kmem_cache_alloc+0x276/0x310 mm/slub.c:3255
 kmem_cache_zalloc include/linux/slab.h:707 [inline]
 qd_alloc+0x51/0x250 fs/gfs2/quota.c:216
 gfs2_quota_init+0x798/0x1040 fs/gfs2/quota.c:1407
 gfs2_make_fs_rw+0x4c0/0x640 fs/gfs2/super.c:153
 gfs2_fill_super+0x3663/0x4a70 fs/gfs2/ops_fstype.c:1269
 get_tree_bdev+0x406/0x630 fs/super.c:1292
 gfs2_get_tree+0x50/0x200 fs/gfs2/ops_fstype.c:1325
 vfs_get_tree+0x86/0x270 fs/super.c:1497
 do_new_mount fs/namespace.c:3026 [inline]
 path_mount+0x1986/0x2c30 fs/namespace.c:3356
 do_mount fs/namespace.c:3369 [inline]
 __do_sys_mount fs/namespace.c:3577 [inline]
 __se_sys_mount+0x308/0x3c0 fs/namespace.c:3554
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1348 [inline]
 free_pcp_prepare+0xcbd/0xec0 mm/page_alloc.c:1400
 free_unref_page_prepare mm/page_alloc.c:3269 [inline]
 free_unref_page+0x7d/0x580 mm/page_alloc.c:3364
 free_slab mm/slub.c:2043 [inline]
 discard_slab mm/slub.c:2049 [inline]
 __unfreeze_partials+0x1ab/0x200 mm/slub.c:2536
 put_cpu_partial+0x116/0x180 mm/slub.c:2612
 do_slab_free mm/slub.c:3511 [inline]
 ___cache_free+0x117/0x1c0 mm/slub.c:3530
 qlist_free_all mm/kasan/quarantine.c:176 [inline]
 kasan_quarantine_reduce+0x127/0x190 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:446
 kasan_slab_alloc include/linux/kasan.h:239 [inline]
 slab_post_alloc_hook mm/slab.h:749 [inline]
 slab_alloc_node mm/slub.c:3230 [inline]
 slab_alloc mm/slub.c:3238 [inline]
 kmem_cache_alloc_trace+0x20b/0x330 mm/slub.c:3269
 kmalloc include/linux/slab.h:584 [inline]
 kzalloc include/linux/slab.h:717 [inline]
 kobject_uevent_env+0x24e/0x1590 lib/kobject_uevent.c:524
 gfs2_recovery_done fs/gfs2/recovery.c:294 [inline]
 gfs2_recover_func+0xab3/0x2620 fs/gfs2/recovery.c:538
 process_one_work+0x86c/0x1190 kernel/workqueue.c:2307
 worker_thread+0xab1/0x1300 kernel/workqueue.c:2454
 kthread+0x2a3/0x2d0 kernel/kthread.c:377
 ret_from_fork+0x1f/0x30

Memory state around the buggy address:
 ffff88802a3bf200: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff88802a3bf280: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb
>ffff88802a3bf300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff88802a3bf380: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fa fb
 ffff88802a3bf400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


---
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