[syzbot ci] Re: net: devmem: improve cpu cost of RX token management
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syzbot ci
Sep 3, 2025, 1:46:36 PM (10 days ago) Sep 3
to almas...@google.com, bobbye...@gmail.com, bobbye...@meta.com, da...@davemloft.net, dsa...@kernel.org, edum...@google.com, ho...@kernel.org, ku...@kernel.org, kun...@google.com, linux-...@vger.kernel.org, ncar...@google.com, net...@vger.kernel.org, pab...@redhat.com, s...@fomichev.me, wil...@google.com, syz...@lists.linux.dev, syzkall...@googlegroups.com
syzbot ci has tested the following series
[v1] net: devmem: improve cpu cost of RX token management
https://lore.kernel.org/all/20250902-scratch-bobbyeshleman-devmem...@meta.com
* [PATCH net-next 1/2] net: devmem: rename tx_vec to vec in dmabuf binding
* [PATCH net-next 2/2] net: devmem: use niov array for token management
and found the following issue:
general protection fault in sock_devmem_dontneed
Full report is available here:
https://ci.syzbot.org/series/c0dc7223-4222-461c-b04b-b6f0004c7509
***
general protection fault in sock_devmem_dontneed
tree: net-next
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git
base: 864ecc4a6dade82d3f70eab43dad0e277aa6fc78
arch: amd64
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
config: https://ci.syzbot.org/builds/6c521908-0a73-48bc-a0fd-2576cf868361/config
C repro: https://ci.syzbot.org/findings/9374f388-d643-42ea-831b-872eb5000b3c/c_repro
syz repro: https://ci.syzbot.org/findings/9374f388-d643-42ea-831b-872eb5000b3c/syz_repro
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 UID: 0 PID: 5993 Comm: syz.0.17 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:sock_devmem_dontneed+0x3fd/0x960 net/core/sock.c:1112
Code: 8b 44 24 40 44 8b 28 44 03 6c 24 14 48 8b 44 24 20 42 80 3c 20 00 74 08 4c 89 ff e8 4d eb c9 f8 4d 8b 3f 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 34 eb c9 f8 4d 8b 3f 4c 89 f8 48
RSP: 0018:ffffc90001c4fac0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffff11004ddcfe0
RDX: ffff88801f6a8000 RSI: 0000000000000400 RDI: 0000000000000000
RBP: ffffc90001c4fc50 R08: ffffc90001c4fbdf R09: 0000000000000000
R10: ffffc90001c4fb60 R11: fffff52000389f7c R12: dffffc0000000000
R13: 00000000ffffffff R14: 0000000000000000 R15: 0000000000000000
FS: 000055558634d500(0000) GS:ffff8880b8614000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30e63fff CR3: 0000000026b68000 CR4: 00000000000006f0
Call Trace:
<TASK>
sk_setsockopt+0x682/0x2dc0 net/core/sock.c:1302
do_sock_setsockopt+0x11b/0x1b0 net/socket.c:2340
__sys_setsockopt net/socket.c:2369 [inline]
__do_sys_setsockopt net/socket.c:2375 [inline]
__se_sys_setsockopt net/socket.c:2372 [inline]
__x64_sys_setsockopt+0x13f/0x1b0 net/socket.c:2372
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fea2bb8ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc81c63348 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fea2bdc5fa0 RCX: 00007fea2bb8ebe9
RDX: 0000000000000050 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 00007fea2bc11e19 R08: 0000000000000048 R09: 0000000000000000
R10: 0000200000000100 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fea2bdc5fa0 R14: 00007fea2bdc5fa0 R15: 0000000000000005
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:sock_devmem_dontneed+0x3fd/0x960 net/core/sock.c:1112
Code: 8b 44 24 40 44 8b 28 44 03 6c 24 14 48 8b 44 24 20 42 80 3c 20 00 74 08 4c 89 ff e8 4d eb c9 f8 4d 8b 3f 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 34 eb c9 f8 4d 8b 3f 4c 89 f8 48
RSP: 0018:ffffc90001c4fac0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffff11004ddcfe0
RDX: ffff88801f6a8000 RSI: 0000000000000400 RDI: 0000000000000000
RBP: ffffc90001c4fc50 R08: ffffc90001c4fbdf R09: 0000000000000000
R10: ffffc90001c4fb60 R11: fffff52000389f7c R12: dffffc0000000000
R13: 00000000ffffffff R14: 0000000000000000 R15: 0000000000000000
FS: 000055558634d500(0000) GS:ffff8880b8614000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30e63fff CR3: 0000000026b68000 CR4: 00000000000006f0
----------------
Code disassembly (best guess):
0: 8b 44 24 40 mov 0x40(%rsp),%eax
4: 44 8b 28 mov (%rax),%r13d
7: 44 03 6c 24 14 add 0x14(%rsp),%r13d
c: 48 8b 44 24 20 mov 0x20(%rsp),%rax
11: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1)
16: 74 08 je 0x20
18: 4c 89 ff mov %r15,%rdi
1b: e8 4d eb c9 f8 call 0xf8c9eb6d
20: 4d 8b 3f mov (%r15),%r15
23: 4c 89 f8 mov %r15,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 4c 89 ff mov %r15,%rdi
34: e8 34 eb c9 f8 call 0xf8c9eb6d
39: 4d 8b 3f mov (%r15),%r15
3c: 4c 89 f8 mov %r15,%rax
3f: 48 rex.W
***
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: syz...@syzkaller.appspotmail.com
---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzk...@googlegroups.com.
[v1] net: devmem: improve cpu cost of RX token management
https://lore.kernel.org/all/20250902-scratch-bobbyeshleman-devmem...@meta.com
* [PATCH net-next 1/2] net: devmem: rename tx_vec to vec in dmabuf binding
* [PATCH net-next 2/2] net: devmem: use niov array for token management
and found the following issue:
general protection fault in sock_devmem_dontneed
Full report is available here:
https://ci.syzbot.org/series/c0dc7223-4222-461c-b04b-b6f0004c7509
***
general protection fault in sock_devmem_dontneed
tree: net-next
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git
base: 864ecc4a6dade82d3f70eab43dad0e277aa6fc78
arch: amd64
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
config: https://ci.syzbot.org/builds/6c521908-0a73-48bc-a0fd-2576cf868361/config
C repro: https://ci.syzbot.org/findings/9374f388-d643-42ea-831b-872eb5000b3c/c_repro
syz repro: https://ci.syzbot.org/findings/9374f388-d643-42ea-831b-872eb5000b3c/syz_repro
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 UID: 0 PID: 5993 Comm: syz.0.17 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:sock_devmem_dontneed+0x3fd/0x960 net/core/sock.c:1112
Code: 8b 44 24 40 44 8b 28 44 03 6c 24 14 48 8b 44 24 20 42 80 3c 20 00 74 08 4c 89 ff e8 4d eb c9 f8 4d 8b 3f 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 34 eb c9 f8 4d 8b 3f 4c 89 f8 48
RSP: 0018:ffffc90001c4fac0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffff11004ddcfe0
RDX: ffff88801f6a8000 RSI: 0000000000000400 RDI: 0000000000000000
RBP: ffffc90001c4fc50 R08: ffffc90001c4fbdf R09: 0000000000000000
R10: ffffc90001c4fb60 R11: fffff52000389f7c R12: dffffc0000000000
R13: 00000000ffffffff R14: 0000000000000000 R15: 0000000000000000
FS: 000055558634d500(0000) GS:ffff8880b8614000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30e63fff CR3: 0000000026b68000 CR4: 00000000000006f0
Call Trace:
<TASK>
sk_setsockopt+0x682/0x2dc0 net/core/sock.c:1302
do_sock_setsockopt+0x11b/0x1b0 net/socket.c:2340
__sys_setsockopt net/socket.c:2369 [inline]
__do_sys_setsockopt net/socket.c:2375 [inline]
__se_sys_setsockopt net/socket.c:2372 [inline]
__x64_sys_setsockopt+0x13f/0x1b0 net/socket.c:2372
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fea2bb8ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc81c63348 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fea2bdc5fa0 RCX: 00007fea2bb8ebe9
RDX: 0000000000000050 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 00007fea2bc11e19 R08: 0000000000000048 R09: 0000000000000000
R10: 0000200000000100 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fea2bdc5fa0 R14: 00007fea2bdc5fa0 R15: 0000000000000005
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:sock_devmem_dontneed+0x3fd/0x960 net/core/sock.c:1112
Code: 8b 44 24 40 44 8b 28 44 03 6c 24 14 48 8b 44 24 20 42 80 3c 20 00 74 08 4c 89 ff e8 4d eb c9 f8 4d 8b 3f 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 34 eb c9 f8 4d 8b 3f 4c 89 f8 48
RSP: 0018:ffffc90001c4fac0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffff11004ddcfe0
RDX: ffff88801f6a8000 RSI: 0000000000000400 RDI: 0000000000000000
RBP: ffffc90001c4fc50 R08: ffffc90001c4fbdf R09: 0000000000000000
R10: ffffc90001c4fb60 R11: fffff52000389f7c R12: dffffc0000000000
R13: 00000000ffffffff R14: 0000000000000000 R15: 0000000000000000
FS: 000055558634d500(0000) GS:ffff8880b8614000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30e63fff CR3: 0000000026b68000 CR4: 00000000000006f0
----------------
Code disassembly (best guess):
0: 8b 44 24 40 mov 0x40(%rsp),%eax
4: 44 8b 28 mov (%rax),%r13d
7: 44 03 6c 24 14 add 0x14(%rsp),%r13d
c: 48 8b 44 24 20 mov 0x20(%rsp),%rax
11: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1)
16: 74 08 je 0x20
18: 4c 89 ff mov %r15,%rdi
1b: e8 4d eb c9 f8 call 0xf8c9eb6d
20: 4d 8b 3f mov (%r15),%r15
23: 4c 89 f8 mov %r15,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 4c 89 ff mov %r15,%rdi
34: e8 34 eb c9 f8 call 0xf8c9eb6d
39: 4d 8b 3f mov (%r15),%r15
3c: 4c 89 f8 mov %r15,%rax
3f: 48 rex.W
***
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: syz...@syzkaller.appspotmail.com
---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzk...@googlegroups.com.
syzbot ci
Sep 12, 2025, 5:40:02 AM (yesterday) Sep 12
to almas...@google.com, bobbye...@gmail.com, bobbye...@meta.com, da...@davemloft.net, dsa...@kernel.org, edum...@google.com, ho...@kernel.org, ku...@kernel.org, kun...@google.com, linux-...@vger.kernel.org, ncar...@google.com, net...@vger.kernel.org, pab...@redhat.com, s...@fomichev.me, wil...@google.com, syz...@lists.linux.dev, syzkall...@googlegroups.com
syzbot ci has tested the following series
[v2] net: devmem: improve cpu cost of RX token management
https://lore.kernel.org/all/20250911-scratch-bobbyeshleman-devmem...@meta.com
* [PATCH net-next v2 1/3] net: devmem: rename tx_vec to vec in dmabuf binding
* [PATCH net-next v2 2/3] net: devmem: use niov array for token management
* [PATCH net-next v2 3/3] net: ethtool: prevent user from breaking devmem single-binding rule
and found the following issue:
general protection fault in sock_devmem_dontneed
Full report is available here:
***
general protection fault in sock_devmem_dontneed
tree: net-next
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git
arch: amd64
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
config: https://ci.syzbot.org/builds/2c30c608-f14f-4e6d-9772-cc5e129939fc/config
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
C repro: https://ci.syzbot.org/findings/c89c36f8-4666-47d0-bc39-35662a268e4d/c_repro
syz repro: https://ci.syzbot.org/findings/c89c36f8-4666-47d0-bc39-35662a268e4d/syz_repro
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:sock_devmem_dontneed+0x40b/0x910 net/core/sock.c:1112
Code: 8b 44 24 18 44 8b 20 44 03 64 24 14 48 8b 44 24 68 80 3c 18 00 74 08 4c 89 ef e8 f0 bb c9 f8 4d 8b 7d 00 4c 89 f8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ff e8 d7 bb c9 f8 4d 8b 2f 4c 89 e8 48 c1
RSP: 0018:ffffc90002987ac0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 1ffff11020d27e78
RDX: ffff88810a039cc0 RSI: 0000000000000003 RDI: 0000000000000000
RBP: ffffc90002987c50 R08: ffffc90002987bdf R09: 0000000000000000
R10: ffffc90002987b60 R11: fffff52000530f7c R12: 0000000000000006
R13: ffff8881235cb710 R14: 0000000000000000 R15: 0000000000000000
FS: 000055555e866500(0000) GS:ffff8881a3c14000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31b63fff CR3: 0000000027a20000 CR4: 00000000000006f0
Call Trace:
<TASK>
sk_setsockopt+0x682/0x2dc0 net/core/sock.c:1301
do_sock_setsockopt+0x11b/0x1b0 net/socket.c:2340
__sys_setsockopt net/socket.c:2369 [inline]
__do_sys_setsockopt net/socket.c:2375 [inline]
__se_sys_setsockopt net/socket.c:2372 [inline]
__x64_sys_setsockopt+0x13f/0x1b0 net/socket.c:2372
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faf24f8eba9
__sys_setsockopt net/socket.c:2369 [inline]
__do_sys_setsockopt net/socket.c:2375 [inline]
__se_sys_setsockopt net/socket.c:2372 [inline]
__x64_sys_setsockopt+0x13f/0x1b0 net/socket.c:2372
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc3eb96018 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007faf251d5fa0 RCX: 00007faf24f8eba9
RDX: 0000000000000050 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 00007faf25011e19 R08: 0000000000000048 R09: 0000000000000000
R10: 0000200000000100 R11: 0000000000000246 R12: 0000000000000000
R13: 00007faf251d5fa0 R14: 00007faf251d5fa0 R15: 0000000000000005
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:sock_devmem_dontneed+0x40b/0x910 net/core/sock.c:1112
Modules linked in:
---[ end trace 0000000000000000 ]---
Code: 8b 44 24 18 44 8b 20 44 03 64 24 14 48 8b 44 24 68 80 3c 18 00 74 08 4c 89 ef e8 f0 bb c9 f8 4d 8b 7d 00 4c 89 f8 48 c1 e8 03 <80> 3c 18 00 74 08 4c 89 ff e8 d7 bb c9 f8 4d 8b 2f 4c 89 e8 48 c1
RSP: 0018:ffffc90002987ac0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 1ffff11020d27e78
RDX: ffff88810a039cc0 RSI: 0000000000000003 RDI: 0000000000000000
RBP: ffffc90002987c50 R08: ffffc90002987bdf R09: 0000000000000000
R10: ffffc90002987b60 R11: fffff52000530f7c R12: 0000000000000006
R13: ffff8881235cb710 R14: 0000000000000000 R15: 0000000000000000
FS: 000055555e866500(0000) GS:ffff8881a3c14000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31b63fff CR3: 0000000027a20000 CR4: 00000000000006f0
----------------
Code disassembly (best guess):
0: 8b 44 24 18 mov 0x18(%rsp),%eax
Code disassembly (best guess):
4: 44 8b 20 mov (%rax),%r12d
7: 44 03 64 24 14 add 0x14(%rsp),%r12d
c: 48 8b 44 24 68 mov 0x68(%rsp),%rax
11: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1)
15: 74 08 je 0x1f
17: 4c 89 ef mov %r13,%rdi
1a: e8 f0 bb c9 f8 call 0xf8c9bc0f
1f: 4d 8b 7d 00 mov 0x0(%r13),%r15
23: 4c 89 f8 mov %r15,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) <-- trapping instruction
26: 48 c1 e8 03 shr $0x3,%rax
2e: 74 08 je 0x38
30: 4c 89 ff mov %r15,%rdi
33: e8 d7 bb c9 f8 call 0xf8c9bc0f
38: 4d 8b 2f mov (%r15),%r13
3b: 4c 89 e8 mov %r13,%rax
3e: 48 rex.W
3f: c1 .byte 0xc1
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