general protection fault in call_rcu

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 02de58b2 Merge tag 'devicetree-fixes-for-5.9-3' of git://g..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14d130cb900000
kernel config: https://syzkaller.appspot.com/x/.config?x=4e672827d2ffab1f
dashboard link: https://syzkaller.appspot.com/bug?extid=cab91b1187bab808bc0d
compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
CC: [ax...@kernel.dk linux-...@vger.kernel.org ol...@redhat.com pet...@infradead.org]

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+cab91b...@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc0000ee0e0f: 0000 [#1] PREEMPT SMP KASAN
KASAN: probably user-memory-access in range [0x0000000007707078-0x000000000770707f]
CPU: 0 PID: 1 Comm: systemd Not tainted 5.9.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__hlist_del include/linux/list.h:831 [inline]
RIP: 0010:hlist_del include/linux/list.h:843 [inline]
RIP: 0010:__alloc_object lib/debugobjects.c:215 [inline]
RIP: 0010:alloc_object lib/debugobjects.c:255 [inline]
RIP: 0010:__debug_object_init+0x4b5/0x19d0 lib/debugobjects.c:548
Code: 3c 08 00 74 08 4c 89 ff e8 b8 51 f2 fd 4d 89 2f 4d 85 ed 74 27 49 83 c5 08 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ef e8 8d 51 f2 fd 4d 89 7d 00 48 b8 00 00
RSP: 0018:ffffc90000c7fca0 EFLAGS: 00010007
RAX: 0000000000ee0e0f RBX: ffff88800014eb30 RCX: dffffc0000000000
RDX: 000000000000000e RSI: 0000000000000004 RDI: ffffc90000c7fc5c
RBP: ffffc90000c7fdd8 R08: dffffc0000000000 R09: fffff5200018ff8c
R10: fffff5200018ff8c R11: 0000000000000000 R12: ffff88800014eb28
R13: 000000000770707f R14: 1ffff11000029d65 R15: ffffffff8bd52fd0
FS: 00007f9ca6890500(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31724000 CR3: 00000000a1c6c000 CR4: 00000000001526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
debug_object_init lib/debugobjects.c:595 [inline]
debug_object_activate+0x138/0x5f0 lib/debugobjects.c:681
debug_rcu_head_queue kernel/rcu/rcu.h:176 [inline]
__call_rcu kernel/rcu/tree.c:2882 [inline]
call_rcu+0x37/0x830 kernel/rcu/tree.c:2970
task_work_run+0x137/0x1c0 kernel/task_work.c:141
tracehook_notify_resume include/linux/tracehook.h:188 [inline]
exit_to_user_mode_loop kernel/entry/common.c:165 [inline]
exit_to_user_mode_prepare+0x11a/0x1e0 kernel/entry/common.c:192
syscall_exit_to_user_mode+0x82/0x1d0 kernel/entry/common.c:267
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f9ca4e329b1
Code: f7 d8 bf ff ff ff ff 64 89 02 eb cb 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 80 3f 00 74 1b be 00 08 09 00 b8 02 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 1f 89 c7 e9 00 ff ff ff 48 8b 05 b1 54 2e 00
RSP: 002b:00007ffed43daf78 EFLAGS: 00000202 ORIG_RAX: 0000000000000002
RAX: fffffffffffffffe RBX: 00005611caedb930 RCX: 00007f9ca4e329b1
RDX: 00005611ca046a90 RSI: 0000000000090800 RDI: 00005611caed75c0
RBP: 00005611caed75c0 R08: 0000000000000000 R09: 0000000000000040
R10: 0000000000000004 R11: 0000000000000202 R12: 00005611cada2990
R13: 00005611caed75c0 R14: 0000000000000000 R15: 00005611ca046a90
Modules linked in:
---[ end trace 17bd9c84aa00d171 ]---
RIP: 0010:__hlist_del include/linux/list.h:831 [inline]
RIP: 0010:hlist_del include/linux/list.h:843 [inline]
RIP: 0010:__alloc_object lib/debugobjects.c:215 [inline]
RIP: 0010:alloc_object lib/debugobjects.c:255 [inline]
RIP: 0010:__debug_object_init+0x4b5/0x19d0 lib/debugobjects.c:548
Code: 3c 08 00 74 08 4c 89 ff e8 b8 51 f2 fd 4d 89 2f 4d 85 ed 74 27 49 83 c5 08 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ef e8 8d 51 f2 fd 4d 89 7d 00 48 b8 00 00
RSP: 0018:ffffc90000c7fca0 EFLAGS: 00010007
RAX: 0000000000ee0e0f RBX: ffff88800014eb30 RCX: dffffc0000000000
RDX: 000000000000000e RSI: 0000000000000004 RDI: ffffc90000c7fc5c
RBP: ffffc90000c7fdd8 R08: dffffc0000000000 R09: fffff5200018ff8c
R10: fffff5200018ff8c R11: 0000000000000000 R12: ffff88800014eb28
R13: 000000000770707f R14: 1ffff11000029d65 R15: ffffffff8bd52fd0
FS: 00007f9ca6890500(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31724000 CR3: 00000000a1c6c000 CR4: 00000000001526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.