[Android 6.1] kernel BUG in sock_write_iter

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 6308d6d3f1b1 UPSTREAM: Bluetooth: hci_conn: fix potential ..
git tree: android14-6.1
console+strace: https://syzkaller.appspot.com/x/log.txt?x=110ef615580000
kernel config: https://syzkaller.appspot.com/x/.config?x=6af0777879025b2
dashboard link: https://syzkaller.appspot.com/bug?extid=d76c58ea1cdc964051a9
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10e9f5f9580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17716925580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/3ada6b5e7537/disk-6308d6d3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/856059323f08/vmlinux-6308d6d3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/02d0071dc422/bzImage-6308d6d3.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d76c58...@syzkaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at net/socket.c:719!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 304 Comm: syz-executor196 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:sock_sendmsg_nosec net/socket.c:719 [inline]
RIP: 0010:__sock_sendmsg net/socket.c:728 [inline]
RIP: 0010:sock_write_iter+0x3e7/0x3f0 net/socket.c:1134
Code: cc fd e9 72 fe ff ff 44 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c 0e fe ff ff 4c 89 ef e8 d3 55 cc fd e9 01 fe ff ff e8 b9 ca 86 fd <0f> 0b 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 b8 1e
RSP: 0018:ffffc90000d57b60 EFLAGS: 00010293
RAX: ffffffff83ea9ee7 RBX: 00000000fffffdef RCX: ffff88810fa25100
RDX: 0000000000000000 RSI: 00000000fffffdef RDI: 00000000fffffdef
RBP: ffffc90000d57c90 R08: ffffc90000d577c7 R09: 1ffff920001aaef8
R10: dffffc0000000000 R11: fffff520001aaef9 R12: dffffc0000000000
R13: ffff88811694e940 R14: ffffc90000d57ba0 R15: 1ffff920001aaf70
FS: 000055555cd083c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000463390 CR3: 0000000123227000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
call_write_iter include/linux/fs.h:2282 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x5ef/0xd00 fs/read_write.c:584
ksys_write+0x14a/0x260 fs/read_write.c:637
__do_sys_write fs/read_write.c:649 [inline]
__se_sys_write fs/read_write.c:646 [inline]
__x64_sys_write+0x7b/0x90 fs/read_write.c:646
x64_sys_call+0x27b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fecca083cb9
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 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 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe18f02258 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000200000000000 RCX: 00007fecca083cb9
RDX: 0000000000000001 RSI: 0000200000000000 RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe18f02398
R13: 0000000000000002 R14: 00002000000000c0 R15: 0000000000000002
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:sock_sendmsg_nosec net/socket.c:719 [inline]
RIP: 0010:__sock_sendmsg net/socket.c:728 [inline]
RIP: 0010:sock_write_iter+0x3e7/0x3f0 net/socket.c:1134
Code: cc fd e9 72 fe ff ff 44 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c 0e fe ff ff 4c 89 ef e8 d3 55 cc fd e9 01 fe ff ff e8 b9 ca 86 fd <0f> 0b 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 b8 1e
RSP: 0018:ffffc90000d57b60 EFLAGS: 00010293
RAX: ffffffff83ea9ee7 RBX: 00000000fffffdef RCX: ffff88810fa25100
RDX: 0000000000000000 RSI: 00000000fffffdef RDI: 00000000fffffdef
RBP: ffffc90000d57c90 R08: ffffc90000d577c7 R09: 1ffff920001aaef8
R10: dffffc0000000000 R11: fffff520001aaef9 R12: dffffc0000000000
R13: ffff88811694e940 R14: ffffc90000d57ba0 R15: 1ffff920001aaf70
FS: 000055555cd083c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000463390 CR3: 0000000123227000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 5bfe2b8c1439 Revert "mmc: sdhci: make tuning_err a signed ..
git tree: android13-5.15-lts
console+strace: https://syzkaller.appspot.com/x/log.txt?x=16e1b8c9580000
kernel config: https://syzkaller.appspot.com/x/.config?x=b0ecca01ee1a007b
dashboard link: https://syzkaller.appspot.com/bug?extid=8ec7866cec4f09ba1d9e

compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12cf2915580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16efa45e580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/81375cb90832/disk-5bfe2b8c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/0b0d46275f98/vmlinux-5bfe2b8c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9690dca8e184/bzImage-5bfe2b8c.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:

Reported-by: syzbot+8ec786...@syzkaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at net/socket.c:707!

invalid opcode: 0000 [#1] PREEMPT SMP KASAN

CPU: 1 PID: 304 Comm: syz-executor939 Not tainted syzkaller #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026

RIP: 0010:sock_sendmsg_nosec net/socket.c:707 [inline]
RIP: 0010:__sock_sendmsg net/socket.c:716 [inline]
RIP: 0010:sock_write_iter+0x39d/0x3a0 net/socket.c:1080
Code: f0 fd e9 98 fe ff ff 44 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c 34 fe ff ff 4c 89 ef e8 ad 48 f0 fd e9 27 fe ff ff e8 c3 d2 b0 fd <0f> 0b 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 38 48 89
RSP: 0018:ffffc90000977b60 EFLAGS: 00010293
RAX: ffffffff83b8f4dd RBX: 00000000fffffdef RCX: ffff888121b38000

RDX: 0000000000000000 RSI: 00000000fffffdef RDI: 00000000fffffdef

RBP: ffffc90000977c70 R08: ffffc900009777e7 R09: 1ffff9200012eefc
R10: dffffc0000000000 R11: fffff5200012eefd R12: dffffc0000000000
R13: ffff888111bedc20 R14: ffffc90000977ba0 R15: 1ffff9200012ef70
FS: 000055557fd253c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00000000006a9ee0 CR3: 000000011e5a0000 CR4: 00000000003506a0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>

call_write_iter include/linux/fs.h:2212 [inline]
new_sync_write fs/read_write.c:507 [inline]
vfs_write+0x831/0xfd0 fs/read_write.c:594
ksys_write+0x14a/0x260 fs/read_write.c:647
__do_sys_write fs/read_write.c:659 [inline]
__se_sys_write fs/read_write.c:656 [inline]
__x64_sys_write+0x7b/0x90 fs/read_write.c:656
x64_sys_call+0x8ef/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f2652edfcb9

Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 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 d8 ff ff ff f7 d8 64 89 01 48

RSP: 002b:00007ffe5d3fad78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000200000000000 RCX: 00007f2652edfcb9

RDX: 0000000000000001 RSI: 0000200000000000 RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe5d3faeb8

R13: 0000000000000002 R14: 00002000000000c0 R15: 0000000000000002
</TASK>
Modules linked in:

---[ end trace 6bb14b75b5cc645d ]---
RIP: 0010:sock_sendmsg_nosec net/socket.c:707 [inline]
RIP: 0010:__sock_sendmsg net/socket.c:716 [inline]
RIP: 0010:sock_write_iter+0x39d/0x3a0 net/socket.c:1080
Code: f0 fd e9 98 fe ff ff 44 89 e9 80 e1 07 80 c1 03 38 c1 0f 8c 34 fe ff ff 4c 89 ef e8 ad 48 f0 fd e9 27 fe ff ff e8 c3 d2 b0 fd <0f> 0b 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 38 48 89
RSP: 0018:ffffc90000977b60 EFLAGS: 00010293
RAX: ffffffff83b8f4dd RBX: 00000000fffffdef RCX: ffff888121b38000

RDX: 0000000000000000 RSI: 00000000fffffdef RDI: 00000000fffffdef

RBP: ffffc90000977c70 R08: ffffc900009777e7 R09: 1ffff9200012eefc
R10: dffffc0000000000 R11: fffff5200012eefd R12: dffffc0000000000
R13: ffff888111bedc20 R14: ffffc90000977ba0 R15: 1ffff9200012ef70
FS: 000055557fd253c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00000000006a9ee0 CR3: 000000011e5a0000 CR4: 00000000003506a0