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Message-ID: <90f8e4f9-c439-479e-873d-e110871ece4d@amd.com>
Date: Tue, 25 Feb 2025 14:20:00 +0530
From: Shivank Garg <shivankg@....com>
To: syzbot <syzbot+556fda2d78f9b0daa141@...kaller.appspotmail.com>,
akpm@...ux-foundation.org, asml.silence@...il.com, axboe@...nel.dk,
io-uring@...r.kernel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
surenb@...gle.com, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [io-uring?] [mm?] general protection fault in
lock_vma_under_rcu
On 2/25/2025 1:40 PM, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: e5d3fd687aac Add linux-next specific files for 20250218
> git tree: linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=1643b498580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=4e945b2fe8e5992f
> dashboard link: https://syzkaller.appspot.com/bug?extid=556fda2d78f9b0daa141
> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=138207a4580000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/ef079ccd2725/disk-e5d3fd68.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/99f2123d6831/vmlinux-e5d3fd68.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/eadfc9520358/bzImage-e5d3fd68.xz
>
> The issue was bisected to:
>
> commit 0670f2f4d6ff1cd6aa351389130ba7bbafb02320
> Author: Suren Baghdasaryan <surenb@...gle.com>
> Date: Thu Feb 13 22:46:49 2025 +0000
>
> mm: replace vm_lock and detached flag with a reference count
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1355bfdf980000
> final oops: https://syzkaller.appspot.com/x/report.txt?x=10d5bfdf980000
> console output: https://syzkaller.appspot.com/x/log.txt?x=1755bfdf980000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+556fda2d78f9b0daa141@...kaller.appspotmail.com
> Fixes: 0670f2f4d6ff ("mm: replace vm_lock and detached flag with a reference count")
>
> Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI
> KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
> CPU: 0 UID: 0 PID: 27018 Comm: syz.1.4414 Not tainted 6.14.0-rc3-next-20250218-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
> RIP: 0010:vma_refcount_put include/linux/mm.h:712 [inline]
> RIP: 0010:vma_end_read include/linux/mm.h:811 [inline]
> RIP: 0010:lock_vma_under_rcu+0x578/0xac0 mm/memory.c:6454
> Code: be 5d b1 ff 49 be 00 00 00 00 00 fc ff df 4d 85 ff 74 0d 49 81 ff 01 f0 ff ff 0f 82 a3 02 00 00 49 83 ff f5 0f 85 55 03 00 00 <41> 80 3e 00 74 0a bf 05 00 00 00 e8 28 df 18 00 4c 8b 34 25 05 00
> RSP: 0000:ffffc9000b837d80 EFLAGS: 00010246
> RAX: fffffffffffffff5 RBX: 0000000000000000 RCX: ffff888079eb8000
> RDX: ffff888079eb8000 RSI: 0000000000000000 RDI: 0000000000000000
> RBP: ffffc9000b837ed8 R08: ffffffff8210a26a R09: 1ffff110068be328
> R10: dffffc0000000000 R11: ffffed10068be329 R12: ffffc9000b837e10
> R13: ffff88802890aa20 R14: dffffc0000000000 R15: fffffffffffffff5
> FS: 00005555908b1500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000400000002fc0 CR3: 0000000011df6000 CR4: 00000000003526f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> <TASK>
> do_user_addr_fault arch/x86/mm/fault.c:1328 [inline]
> handle_page_fault arch/x86/mm/fault.c:1480 [inline]
> exc_page_fault+0x17b/0x920 arch/x86/mm/fault.c:1538
> asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
> RIP: 0033:0x7f617a954ed8
> Code: fc 89 37 c3 c5 fa 6f 06 c5 fa 6f 4c 16 f0 c5 fa 7f 07 c5 fa 7f 4c 17 f0 c3 66 0f 1f 84 00 00 00 00 00 48 8b 4c 16 f8 48 8b 36 <48> 89 37 48 89 4c 17 f8 c3 c5 fe 6f 54 16 e0 c5 fe 6f 5c 16 c0 c5
> RSP: 002b:00007ffc20f24718 EFLAGS: 00010246
> RAX: 0000400000002fc0 RBX: 0000000000000004 RCX: 0031313230386c6e
> RDX: 0000000000000008 RSI: 0031313230386c6e RDI: 0000400000002fc0
> RBP: 0000000000000000 R08: 00007f617a800000 R09: 0000000000000001
> R10: 0000000000000001 R11: 0000000000000009 R12: 00007f617aba5fac
> R13: 00007f617aba5fa0 R14: fffffffffffffffe R15: 0000000000000006
> </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:vma_refcount_put include/linux/mm.h:712 [inline]
> RIP: 0010:vma_end_read include/linux/mm.h:811 [inline]
> RIP: 0010:lock_vma_under_rcu+0x578/0xac0 mm/memory.c:6454
> Code: be 5d b1 ff 49 be 00 00 00 00 00 fc ff df 4d 85 ff 74 0d 49 81 ff 01 f0 ff ff 0f 82 a3 02 00 00 49 83 ff f5 0f 85 55 03 00 00 <41> 80 3e 00 74 0a bf 05 00 00 00 e8 28 df 18 00 4c 8b 34 25 05 00
> RSP: 0000:ffffc9000b837d80 EFLAGS: 00010246
> RAX: fffffffffffffff5 RBX: 0000000000000000 RCX: ffff888079eb8000
> RDX: ffff888079eb8000 RSI: 0000000000000000 RDI: 0000000000000000
> RBP: ffffc9000b837ed8 R08: ffffffff8210a26a R09: 1ffff110068be328
> R10: dffffc0000000000 R11: ffffed10068be329 R12: ffffc9000b837e10
> R13: ffff88802890aa20 R14: dffffc0000000000 R15: fffffffffffffff5
> FS: 00005555908b1500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007ff182f3cf98 CR3: 0000000011df6000 CR4: 00000000003526f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> ----------------
> Code disassembly (best guess), 1 bytes skipped:
> 0: 5d pop %rbp
> 1: b1 ff mov $0xff,%cl
> 3: 49 be 00 00 00 00 00 movabs $0xdffffc0000000000,%r14
> a: fc ff df
> d: 4d 85 ff test %r15,%r15
> 10: 74 0d je 0x1f
> 12: 49 81 ff 01 f0 ff ff cmp $0xfffffffffffff001,%r15
> 19: 0f 82 a3 02 00 00 jb 0x2c2
> 1f: 49 83 ff f5 cmp $0xfffffffffffffff5,%r15
> 23: 0f 85 55 03 00 00 jne 0x37e
> * 29: 41 80 3e 00 cmpb $0x0,(%r14) <-- trapping instruction
> 2d: 74 0a je 0x39
> 2f: bf 05 00 00 00 mov $0x5,%edi
> 34: e8 28 df 18 00 call 0x18df61
> 39: 4c rex.WR
> 3a: 8b .byte 0x8b
> 3b: 34 25 xor $0x25,%al
> 3d: 05 .byte 0x5
Hi,
This issue is fixed by this patch:
https://lore.kernel.org/all/20250220200208.323769-1-surenb@google.com
#syz fix: mm: fix a crash due to vma_end_read() that should have been removed
Thanks,
Shivank
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