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WARNING: suspicious RCU usage in ext4_release_system_zone

Status: closed as invalid on 2019/08/31 00:17
Subsystems: ext4
[Documentation on labels]
Reported-by: syzbot+5bda120b4032f831c57f@syzkaller.appspotmail.com
First crash: 1704d, last: 1703d
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
WARNING: suspicious RCU usage in ext4_release_system_zone 1 (2) 2019/08/31 00:17

Sample crash report:
=============================
WARNING: suspicious RCU usage
5.3.0-rc6-next-20190826 #73 Not tainted
-----------------------------
fs/ext4/block_validity.c:333 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
1 lock held by syz-executor.5/8718:
 #0: ffff888096134d58 (&type->s_umount_key#32){++++}, at: deactivate_super fs/super.c:363 [inline]
 #0: ffff888096134d58 (&type->s_umount_key#32){++++}, at: deactivate_super+0x1aa/0x1d0 fs/super.c:360

stack backtrace:
CPU: 1 PID: 8718 Comm: syz-executor.5 Not tainted 5.3.0-rc6-next-20190826 #73
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+0x172/0x1f0 lib/dump_stack.c:113
 lockdep_rcu_suspicious+0x153/0x15d kernel/locking/lockdep.c:5438
 ext4_release_system_zone+0x166/0x1a0 fs/ext4/block_validity.c:333
 ext4_put_super+0x954/0xd70 fs/ext4/super.c:992
 generic_shutdown_super+0x14c/0x370 fs/super.c:460
 kill_block_super+0xa0/0x100 fs/super.c:1434
 deactivate_locked_super+0x95/0x100 fs/super.c:333
 deactivate_super fs/super.c:364 [inline]
 deactivate_super+0x1b2/0x1d0 fs/super.c:360
 cleanup_mnt+0x351/0x4c0 fs/namespace.c:1102
 __cleanup_mnt+0x16/0x20 fs/namespace.c:1109
 task_work_run+0x145/0x1c0 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:188 [inline]
 exit_to_usermode_loop+0x316/0x380 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:274 [inline]
 do_syscall_64+0x65f/0x760 arch/x86/entry/common.c:300
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c2a7
Code: 64 89 04 25 d0 02 00 00 58 5f ff d0 48 89 c7 e8 2f be ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 9d 8d fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffdba0229d8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000045c2a7
RDX: 0000000000403520 RSI: 0000000000000002 RDI: 00007ffdba022a80
RBP: 000000000000005e R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000005 R11: 0000000000000202 R12: 00007ffdba023b10
R13: 00005555559e7940 R14: 0000000000000000 R15: 00007ffdba023b10
------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: percpu_counter hint: 0x0
WARNING: CPU: 1 PID: 8718 at lib/debugobjects.c:481 debug_print_object+0x168/0x250 lib/debugobjects.c:481

Crashes (126):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/08/27 17:10 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/27 14:59 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/27 14:38 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/27 13:27 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/27 12:17 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/27 11:58 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/27 09:27 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/27 08:05 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/27 07:18 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/27 06:15 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/27 05:12 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 23:09 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 22:32 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 21:29 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 18:45 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 17:33 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 17:27 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 17:22 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 16:50 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 16:49 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 16:30 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 16:26 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 16:26 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 16:25 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 16:15 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 16:10 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 16:09 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 16:05 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 16:05 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 16:03 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 15:53 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 15:50 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 15:46 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 15:33 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 15:31 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 15:28 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 15:27 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 15:19 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 15:14 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 15:08 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 14:59 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 14:58 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
2019/08/26 14:58 linux-next ed858b88e6cb d21c5d9d .config console log report ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.