* [moderation/CI] Re: mm/vmalloc: free unused pages when shrinking vrealloc() allocation
@ 2026-05-07 17:30 syzbot ci
2026-05-07 20:24 ` Aleksandr Nogikh
0 siblings, 1 reply; 2+ messages in thread
From: syzbot ci @ 2026-05-07 17:30 UTC (permalink / raw)
To: syzkaller-upstream-moderation; +Cc: syzbot
syzbot ci has tested the following series
[v1] mm/vmalloc: free unused pages when shrinking vrealloc() allocation
https://lore.kernel.org/all/20260507114854.41117-1-jillravaliya@gmail.com
* [PATCH 1/2] mm/vmalloc: free unused pages when shrinking vrealloc() allocation
* [PATCH 2/2] selftests/mm: add test for vrealloc() shrink page freeing
and found the following issue:
kernel BUG in __vunmap_range_noflush
Full report is available here:
https://ci.syzbot.org/series/13b0874e-a9f8-4992-be93-e93cc88e5e44
***
kernel BUG in __vunmap_range_noflush
tree: torvalds
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
base: 2c340aab5485ebe9e33c01437dd4815ef33c8df5
arch: amd64
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
config: https://ci.syzbot.org/builds/625f7138-9b20-4205-b0e7-02ed1219bd31/config
syz repro: https://ci.syzbot.org/findings/13e8dc07-d697-4345-a27f-319e9c1fe3d6/syz_repro
------------[ cut here ]------------
kernel BUG at mm/vmalloc.c:488!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 5824 Comm: syz.2.19 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__vunmap_range_noflush+0xb4d/0xb70 mm/vmalloc.c:488
Code: 00 e9 64 f5 ff ff e8 12 8d a6 ff 48 c7 c7 a0 0e a8 8e 48 8b 74 24 48 48 89 da e8 0e c5 cf 02 e9 67 f5 ff ff e8 f4 8c a6 ff 90 <0f> 0b e8 ec 8c a6 ff e9 53 ff ff ff e8 e2 8c a6 ff bb 02 00 00 00
RSP: 0018:ffffc90003b575e0 EFLAGS: 00010293
RAX: ffffffff821f16bc RBX: ffffc900036fa000 RCX: ffff8881072a1d80
RDX: 0000000000000000 RSI: ffffc900036fa000 RDI: ffffc900036fa000
RBP: ffff88816ebb3980 R08: ffff88810007f1bb R09: 0000000000000000
R10: ffffc900036f9bb0 R11: ffffed102000fe38 R12: 0000000000000001
R13: ffffc900036fa000 R14: ffffc900036fa000 R15: dffffc0000000000
FS: 00007f4d6b8c46c0(0000) GS:ffff8882a9293000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055924f0dd8c0 CR3: 00000001057f2000 CR4: 00000000000006f0
Call Trace:
<TASK>
vunmap_range_noflush mm/vmalloc.c:506 [inline]
vunmap_range mm/vmalloc.c:521 [inline]
vrealloc_node_align_noprof+0x4fc/0x880 mm/vmalloc.c:4346
bpf_patch_insn_data+0xeb/0x10a0 kernel/bpf/fixups.c:254
bpf_convert_ctx_accesses+0x213f/0x2d70 kernel/bpf/fixups.c:974
bpf_check+0x2b8e/0x49f0 kernel/bpf/verifier.c:20094
bpf_prog_load+0x1406/0x1a10 kernel/bpf/syscall.c:3082
__sys_bpf+0x618/0x950 kernel/bpf/syscall.c:6248
__do_sys_bpf kernel/bpf/syscall.c:6361 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6359 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6359
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4d6a99cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4d6b8c4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f4d6ac15fa0 RCX: 00007f4d6a99cdd9
RDX: 0000000000000048 RSI: 00002000000054c0 RDI: 0000000000000005
RBP: 00007f4d6aa32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4d6ac16038 R14: 00007f4d6ac15fa0 R15: 00007ffff714fc08
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__vunmap_range_noflush+0xb4d/0xb70 mm/vmalloc.c:488
Code: 00 e9 64 f5 ff ff e8 12 8d a6 ff 48 c7 c7 a0 0e a8 8e 48 8b 74 24 48 48 89 da e8 0e c5 cf 02 e9 67 f5 ff ff e8 f4 8c a6 ff 90 <0f> 0b e8 ec 8c a6 ff e9 53 ff ff ff e8 e2 8c a6 ff bb 02 00 00 00
RSP: 0018:ffffc90003b575e0 EFLAGS: 00010293
RAX: ffffffff821f16bc RBX: ffffc900036fa000 RCX: ffff8881072a1d80
RDX: 0000000000000000 RSI: ffffc900036fa000 RDI: ffffc900036fa000
RBP: ffff88816ebb3980 R08: ffff88810007f1bb R09: 0000000000000000
R10: ffffc900036f9bb0 R11: ffffed102000fe38 R12: 0000000000000001
R13: ffffc900036fa000 R14: ffffc900036fa000 R15: dffffc0000000000
FS: 00007f4d6b8c46c0(0000) GS:ffff8882a9293000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdaf55afd8 CR3: 00000001057f2000 CR4: 00000000000006f0
***
If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
Tested-by: syzbot@syzkaller.appspotmail.com
---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzkaller@googlegroups.com.
To test a patch for this bug, please reply with `#syz test`
(should be on a separate line).
The patch should be attached to the email.
Note: arguments like custom git repos and branches are not supported.
The email will later be sent to:
[akpm@linux-foundation.org jillravaliya@gmail.com linux-kernel@vger.kernel.org linux-mm@kvack.org urezki@gmail.com]
If the report looks fine to you, reply with:
#syz upstream
If the report is a false positive, reply with
#syz invalid
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [moderation/CI] Re: mm/vmalloc: free unused pages when shrinking vrealloc() allocation
2026-05-07 17:30 [moderation/CI] Re: mm/vmalloc: free unused pages when shrinking vrealloc() allocation syzbot ci
@ 2026-05-07 20:24 ` Aleksandr Nogikh
0 siblings, 0 replies; 2+ messages in thread
From: Aleksandr Nogikh @ 2026-05-07 20:24 UTC (permalink / raw)
To: syzbot ci; +Cc: syzkaller-upstream-moderation, syzbot
#syz upstream
On Thu, May 7, 2026 at 7:30 PM syzbot ci
<syzbot+ci1936964899135e53@syzkaller.appspotmail.com> wrote:
>
> syzbot ci has tested the following series
>
> [v1] mm/vmalloc: free unused pages when shrinking vrealloc() allocation
> https://lore.kernel.org/all/20260507114854.41117-1-jillravaliya@gmail.com
> * [PATCH 1/2] mm/vmalloc: free unused pages when shrinking vrealloc() allocation
> * [PATCH 2/2] selftests/mm: add test for vrealloc() shrink page freeing
>
> and found the following issue:
> kernel BUG in __vunmap_range_noflush
>
> Full report is available here:
> https://ci.syzbot.org/series/13b0874e-a9f8-4992-be93-e93cc88e5e44
>
> ***
>
> kernel BUG in __vunmap_range_noflush
>
> tree: torvalds
> URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
> base: 2c340aab5485ebe9e33c01437dd4815ef33c8df5
> arch: amd64
> compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
> config: https://ci.syzbot.org/builds/625f7138-9b20-4205-b0e7-02ed1219bd31/config
> syz repro: https://ci.syzbot.org/findings/13e8dc07-d697-4345-a27f-319e9c1fe3d6/syz_repro
>
> ------------[ cut here ]------------
> kernel BUG at mm/vmalloc.c:488!
> Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
> CPU: 1 UID: 0 PID: 5824 Comm: syz.2.19 Not tainted syzkaller #0 PREEMPT(full)
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
> RIP: 0010:__vunmap_range_noflush+0xb4d/0xb70 mm/vmalloc.c:488
> Code: 00 e9 64 f5 ff ff e8 12 8d a6 ff 48 c7 c7 a0 0e a8 8e 48 8b 74 24 48 48 89 da e8 0e c5 cf 02 e9 67 f5 ff ff e8 f4 8c a6 ff 90 <0f> 0b e8 ec 8c a6 ff e9 53 ff ff ff e8 e2 8c a6 ff bb 02 00 00 00
> RSP: 0018:ffffc90003b575e0 EFLAGS: 00010293
> RAX: ffffffff821f16bc RBX: ffffc900036fa000 RCX: ffff8881072a1d80
> RDX: 0000000000000000 RSI: ffffc900036fa000 RDI: ffffc900036fa000
> RBP: ffff88816ebb3980 R08: ffff88810007f1bb R09: 0000000000000000
> R10: ffffc900036f9bb0 R11: ffffed102000fe38 R12: 0000000000000001
> R13: ffffc900036fa000 R14: ffffc900036fa000 R15: dffffc0000000000
> FS: 00007f4d6b8c46c0(0000) GS:ffff8882a9293000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000055924f0dd8c0 CR3: 00000001057f2000 CR4: 00000000000006f0
> Call Trace:
> <TASK>
> vunmap_range_noflush mm/vmalloc.c:506 [inline]
> vunmap_range mm/vmalloc.c:521 [inline]
> vrealloc_node_align_noprof+0x4fc/0x880 mm/vmalloc.c:4346
> bpf_patch_insn_data+0xeb/0x10a0 kernel/bpf/fixups.c:254
> bpf_convert_ctx_accesses+0x213f/0x2d70 kernel/bpf/fixups.c:974
> bpf_check+0x2b8e/0x49f0 kernel/bpf/verifier.c:20094
> bpf_prog_load+0x1406/0x1a10 kernel/bpf/syscall.c:3082
> __sys_bpf+0x618/0x950 kernel/bpf/syscall.c:6248
> __do_sys_bpf kernel/bpf/syscall.c:6361 [inline]
> __se_sys_bpf kernel/bpf/syscall.c:6359 [inline]
> __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6359
> do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
> do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
> entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f4d6a99cdd9
> Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007f4d6b8c4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
> RAX: ffffffffffffffda RBX: 00007f4d6ac15fa0 RCX: 00007f4d6a99cdd9
> RDX: 0000000000000048 RSI: 00002000000054c0 RDI: 0000000000000005
> RBP: 00007f4d6aa32d69 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> R13: 00007f4d6ac16038 R14: 00007f4d6ac15fa0 R15: 00007ffff714fc08
> </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:__vunmap_range_noflush+0xb4d/0xb70 mm/vmalloc.c:488
> Code: 00 e9 64 f5 ff ff e8 12 8d a6 ff 48 c7 c7 a0 0e a8 8e 48 8b 74 24 48 48 89 da e8 0e c5 cf 02 e9 67 f5 ff ff e8 f4 8c a6 ff 90 <0f> 0b e8 ec 8c a6 ff e9 53 ff ff ff e8 e2 8c a6 ff bb 02 00 00 00
> RSP: 0018:ffffc90003b575e0 EFLAGS: 00010293
> RAX: ffffffff821f16bc RBX: ffffc900036fa000 RCX: ffff8881072a1d80
> RDX: 0000000000000000 RSI: ffffc900036fa000 RDI: ffffc900036fa000
> RBP: ffff88816ebb3980 R08: ffff88810007f1bb R09: 0000000000000000
> R10: ffffc900036f9bb0 R11: ffffed102000fe38 R12: 0000000000000001
> R13: ffffc900036fa000 R14: ffffc900036fa000 R15: dffffc0000000000
> FS: 00007f4d6b8c46c0(0000) GS:ffff8882a9293000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007ffdaf55afd8 CR3: 00000001057f2000 CR4: 00000000000006f0
>
>
> ***
>
> If these findings have caused you to resend the series or submit a
> separate fix, please add the following tag to your commit message:
> Tested-by: syzbot@syzkaller.appspotmail.com
>
> ---
> This report is generated by a bot. It may contain errors.
> syzbot ci engineers can be reached at syzkaller@googlegroups.com.
>
> To test a patch for this bug, please reply with `#syz test`
> (should be on a separate line).
>
> The patch should be attached to the email.
> Note: arguments like custom git repos and branches are not supported.
>
> The email will later be sent to:
> [akpm@linux-foundation.org jillravaliya@gmail.com linux-kernel@vger.kernel.org linux-mm@kvack.org urezki@gmail.com]
>
> If the report looks fine to you, reply with:
> #syz upstream
>
> If the report is a false positive, reply with
> #syz invalid
>
> --
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2026-05-07 17:30 [moderation/CI] Re: mm/vmalloc: free unused pages when shrinking vrealloc() allocation syzbot ci
2026-05-07 20:24 ` Aleksandr Nogikh
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