[syzbot] [kernel?] kernel BUG in binder_alloc_deferred_release (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: c2ee9f594da8 KVM: selftests: Fix build on on non-x86 archi..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=16a6324b980000
kernel config: https://syzkaller.appspot.com/x/.config?x=a34ca8ca33c0e535
dashboard link: https://syzkaller.appspot.com/bug?extid=dee8aa54cb2f5a150f9e
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1484165f980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=132b2ebb980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/05e1e9a9e3e9/disk-c2ee9f59.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c9ad3be6c91b/vmlinux-c2ee9f59.xz
kernel image: https://storage.googleapis.com/syzbot-assets/737d48c357b7/bzImage-c2ee9f59.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+dee8aa...@syzkaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at drivers/android/binder_alloc.c:897!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 0 UID: 0 PID: 9 Comm: kworker/0:1 Not tainted 6.12.0-rc4-syzkaller-00047-gc2ee9f594da8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: events binder_deferred_func
RIP: 0010:binder_alloc_deferred_release+0x68c/0x820 drivers/android/binder_alloc.c:897
Code: 00 00 00 48 c7 c6 20 7f 8d 8c 48 c7 c7 e0 7c 8d 8c 44 8b 44 24 14 8b 4c 24 10 e8 ef fd bb f8 e9 56 ff ff ff e8 d5 4b dc f8 90 <0f> 0b e8 cd 4b dc f8 48 89 ef e8 05 46 9c f8 e9 21 ff ff ff e8 ab
RSP: 0018:ffffc900000e7b98 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff8880415e3220 RCX: ffffffff816b1a6d
RDX: ffff88801d6c0000 RSI: ffffffff88b1332b RDI: ffff8880415e3260
RBP: 0000000000000003 R08: 0000000000000001 R09: fffff5200001cf65
R10: 0000000000000003 R11: 0000000000000000 R12: ffff8880335c1860
R13: ffff8880335c1910 R14: ffff8880415e32c8 R15: ffff8880415e3000
FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f005c851546 CR3: 0000000079838000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
binder_free_proc drivers/android/binder.c:5237 [inline]
binder_proc_dec_tmpref drivers/android/binder.c:1559 [inline]
binder_proc_dec_tmpref+0x291/0x590 drivers/android/binder.c:1552
binder_deferred_release drivers/android/binder.c:6269 [inline]
binder_deferred_func+0xeda/0x12e0 drivers/android/binder.c:6296
process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
process_scheduled_works kernel/workqueue.c:3310 [inline]
worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:binder_alloc_deferred_release+0x68c/0x820 drivers/android/binder_alloc.c:897
Code: 00 00 00 48 c7 c6 20 7f 8d 8c 48 c7 c7 e0 7c 8d 8c 44 8b 44 24 14 8b 4c 24 10 e8 ef fd bb f8 e9 56 ff ff ff e8 d5 4b dc f8 90 <0f> 0b e8 cd 4b dc f8 48 89 ef e8 05 46 9c f8 e9 21 ff ff ff e8 ab
RSP: 0018:ffffc900000e7b98 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff8880415e3220 RCX: ffffffff816b1a6d
RDX: ffff88801d6c0000 RSI: ffffffff88b1332b RDI: ffff8880415e3260
RBP: 0000000000000003 R08: 0000000000000001 R09: fffff5200001cf65
R10: 0000000000000003 R11: 0000000000000000 R12: ffff8880335c1860
R13: ffff8880335c1910 R14: ffff8880415e32c8 R15: ffff8880415e3000
FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f005c851546 CR3: 000000000df7c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
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If you want to undo deduplication, reply with:
#syz undup

[Hillf Danton]

On Mon, 28 Oct 2024 09:33:26 -0700

> syzbot found the following issue on:
>
> HEAD commit: c2ee9f594da8 KVM: selftests: Fix build on on non-x86 archi..
> git tree: upstream

> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=132b2ebb980000

#syz test

--- x/drivers/android/binder.c
+++ y/drivers/android/binder.c
@@ -6307,6 +6307,7 @@ binder_defer_work(struct binder_proc *pr
hlist_add_head(&proc->deferred_work_node,
&binder_deferred_list);
schedule_work(&binder_deferred_work);
+ binder_alloc_vma_close(&proc->alloc);
}
mutex_unlock(&binder_deferred_lock);
}
--

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+dee8aa...@syzkaller.appspotmail.com
Tested-by: syzbot+dee8aa...@syzkaller.appspotmail.com

Tested on:

commit: e42b1a9a Merge tag 'spi-fix-v6.12-rc5' of git://git.ke..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12784540580000
kernel config: https://syzkaller.appspot.com/x/.config?x=4340261e4e9f37fc

dashboard link: https://syzkaller.appspot.com/bug?extid=dee8aa54cb2f5a150f9e
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

patch: https://syzkaller.appspot.com/x/patch.diff?x=14904540580000

Note: testing is done by a robot and is best-effort only.

[syzbot]

syzbot has bisected this issue to:

commit f8d112a4e657c65c888e6b8a8435ef61a66e4ab8
Author: Liam R. Howlett <Liam.H...@Oracle.com>
Date: Fri Aug 30 04:00:54 2024 +0000

mm/mmap: avoid zeroing vma tree in mmap_region()

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11fc46a7980000
start commit: c2ee9f594da8 KVM: selftests: Fix build on on non-x86 archi..
git tree: upstream
final oops: https://syzkaller.appspot.com/x/report.txt?x=13fc46a7980000
console output: https://syzkaller.appspot.com/x/log.txt?x=15fc46a7980000

kernel config: https://syzkaller.appspot.com/x/.config?x=a34ca8ca33c0e535
dashboard link: https://syzkaller.appspot.com/bug?extid=dee8aa54cb2f5a150f9e

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1484165f980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=132b2ebb980000

Reported-by: syzbot+dee8aa...@syzkaller.appspotmail.com
Fixes: f8d112a4e657 ("mm/mmap: avoid zeroing vma tree in mmap_region()")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

[Liam R. Howlett]

* syzbot <syzbot+dee8aa...@syzkaller.appspotmail.com> [241104 11:21]:

Let's get this out of the way..

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/ mm-hotfixes-unstable

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+dee8aa...@syzkaller.appspotmail.com
Tested-by: syzbot+dee8aa...@syzkaller.appspotmail.com

Tested on:

commit: 0012ab09 fs/proc: fix compile warning about variable '..
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/ mm-hotfixes-unstable
console output: https://syzkaller.appspot.com/x/log.txt?x=11a42740580000

kernel config: https://syzkaller.appspot.com/x/.config?x=4340261e4e9f37fc
dashboard link: https://syzkaller.appspot.com/bug?extid=dee8aa54cb2f5a150f9e
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Note: no patches were applied.

[syzbot]

syzbot suspects this issue was fixed by commit:

commit 4080ef1579b2413435413988d14ac8c68e4d42c8
Author: Lorenzo Stoakes <lorenzo...@oracle.com>
Date: Tue Oct 29 18:11:45 2024 +0000

mm: unconditionally close VMAs on error

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1329cd44580000
start commit: c2ee9f594da8 KVM: selftests: Fix build on on non-x86 archi..
git tree: upstream

kernel config: https://syzkaller.appspot.com/x/.config?x=a34ca8ca33c0e535
dashboard link: https://syzkaller.appspot.com/bug?extid=dee8aa54cb2f5a150f9e

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1484165f980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=132b2ebb980000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: mm: unconditionally close VMAs on error

[syzbot]

Auto-closing this bug as obsolete.
No recent activity, existing reproducers are no longer triggering the issue.