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Message-ID: <68f91ba4.050a0220.346f24.005f.GAE@google.com> Date: Wed, 22 Oct 2025 11:00:04 -0700 From: syzbot <syzbot+d101e12bccd4095460e7@...kaller.appspotmail.com> To: linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: Forwarded: Re: [syzbot] [sctp?] KMSAN: uninit-value in sctp_inq_pop (3) For archival purposes, forwarding an incoming command email to linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com. *** Subject: Re: [syzbot] [sctp?] KMSAN: uninit-value in sctp_inq_pop (3) Author: vnranganath.20@...il.com #syz test On Wed, Oct 22, 2025 at 5:23 PM syzbot < syzbot+d101e12bccd4095460e7@...kaller.appspotmail.com> wrote: > Hello, > > syzbot has tested the proposed patch but the reproducer is still > triggering an issue: > KMSAN: uninit-value in sctp_inq_pop > > ===================================================== > BUG: KMSAN: uninit-value in sctp_inq_pop+0x159c/0x1aa0 > net/sctp/inqueue.c:213 > sctp_inq_pop+0x159c/0x1aa0 net/sctp/inqueue.c:213 > sctp_assoc_bh_rcv+0x1a0/0xbc0 net/sctp/associola.c:980 > sctp_inq_push+0x2a6/0x350 net/sctp/inqueue.c:88 > sctp_backlog_rcv+0x3c7/0xda0 net/sctp/input.c:331 > sk_backlog_rcv+0x142/0x420 include/net/sock.h:1158 > __release_sock+0x1ef/0x380 net/core/sock.c:3180 > release_sock+0x6b/0x270 net/core/sock.c:3735 > sctp_sendmsg+0x3a2b/0x49f0 net/sctp/socket.c:2036 > inet_sendmsg+0x26c/0x2a0 net/ipv4/af_inet.c:853 > sock_sendmsg_nosec net/socket.c:727 [inline] > __sock_sendmsg+0x278/0x3d0 net/socket.c:742 > sock_sendmsg+0x170/0x280 net/socket.c:765 > splice_to_socket+0x10e6/0x1a60 fs/splice.c:886 > do_splice_from fs/splice.c:938 [inline] > do_splice+0x1fd2/0x30d0 fs/splice.c:1351 > __do_splice fs/splice.c:1433 [inline] > __do_sys_splice fs/splice.c:1636 [inline] > __se_sys_splice+0x549/0x8c0 fs/splice.c:1618 > __x64_sys_splice+0x114/0x1a0 fs/splice.c:1618 > x64_sys_call+0x3140/0x3e30 > arch/x86/include/generated/asm/syscalls_64.h:276 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xd9/0xfa0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > Uninit was stored to memory at: > sctp_inq_pop+0x150b/0x1aa0 net/sctp/inqueue.c:209 > sctp_assoc_bh_rcv+0x1a0/0xbc0 net/sctp/associola.c:980 > sctp_inq_push+0x2a6/0x350 net/sctp/inqueue.c:88 > sctp_backlog_rcv+0x3c7/0xda0 net/sctp/input.c:331 > sk_backlog_rcv+0x142/0x420 include/net/sock.h:1158 > __release_sock+0x1ef/0x380 net/core/sock.c:3180 > release_sock+0x6b/0x270 net/core/sock.c:3735 > sctp_sendmsg+0x3a2b/0x49f0 net/sctp/socket.c:2036 > inet_sendmsg+0x26c/0x2a0 net/ipv4/af_inet.c:853 > sock_sendmsg_nosec net/socket.c:727 [inline] > __sock_sendmsg+0x278/0x3d0 net/socket.c:742 > sock_sendmsg+0x170/0x280 net/socket.c:765 > splice_to_socket+0x10e6/0x1a60 fs/splice.c:886 > do_splice_from fs/splice.c:938 [inline] > do_splice+0x1fd2/0x30d0 fs/splice.c:1351 > __do_splice fs/splice.c:1433 [inline] > __do_sys_splice fs/splice.c:1636 [inline] > __se_sys_splice+0x549/0x8c0 fs/splice.c:1618 > __x64_sys_splice+0x114/0x1a0 fs/splice.c:1618 > x64_sys_call+0x3140/0x3e30 > arch/x86/include/generated/asm/syscalls_64.h:276 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xd9/0xfa0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > Uninit was created at: > slab_post_alloc_hook mm/slub.c:4969 [inline] > slab_alloc_node mm/slub.c:5272 [inline] > kmem_cache_alloc_node_noprof+0x989/0x16b0 mm/slub.c:5324 > kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:579 > __alloc_skb+0x347/0x7d0 net/core/skbuff.c:670 > alloc_skb include/linux/skbuff.h:1383 [inline] > sctp_packet_transmit+0x44b/0x46d0 net/sctp/output.c:598 > sctp_outq_flush_transports net/sctp/outqueue.c:1173 [inline] > sctp_outq_flush+0x1c7d/0x67c0 net/sctp/outqueue.c:1221 > sctp_outq_uncork+0x9e/0xc0 net/sctp/outqueue.c:764 > sctp_cmd_interpreter net/sctp/sm_sideeffect.c:-1 [inline] > sctp_side_effects net/sctp/sm_sideeffect.c:1204 [inline] > sctp_do_sm+0x8c8e/0x9720 net/sctp/sm_sideeffect.c:1175 > sctp_primitive_SEND+0xd7/0x110 net/sctp/primitive.c:163 > sctp_sendmsg_to_asoc+0x1db8/0x2250 net/sctp/socket.c:1873 > sctp_sendmsg+0x3910/0x49f0 net/sctp/socket.c:2031 > inet_sendmsg+0x26c/0x2a0 net/ipv4/af_inet.c:853 > sock_sendmsg_nosec net/socket.c:727 [inline] > __sock_sendmsg+0x278/0x3d0 net/socket.c:742 > sock_sendmsg+0x170/0x280 net/socket.c:765 > splice_to_socket+0x10e6/0x1a60 fs/splice.c:886 > do_splice_from fs/splice.c:938 [inline] > do_splice+0x1fd2/0x30d0 fs/splice.c:1351 > __do_splice fs/splice.c:1433 [inline] > __do_sys_splice fs/splice.c:1636 [inline] > __se_sys_splice+0x549/0x8c0 fs/splice.c:1618 > __x64_sys_splice+0x114/0x1a0 fs/splice.c:1618 > x64_sys_call+0x3140/0x3e30 > arch/x86/include/generated/asm/syscalls_64.h:276 > do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > do_syscall_64+0xd9/0xfa0 arch/x86/entry/syscall_64.c:94 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > CPU: 1 UID: 0 PID: 6609 Comm: syz.0.18 Not tainted syzkaller #0 > PREEMPT(none) > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 10/02/2025 > ===================================================== > > > Tested on: > > commit: 552c5071 Merge tag 'vfio-v6.18-rc3' of https://github... > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=145e2d42580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=bbd3e7f3c2e28265 > dashboard link: > https://syzkaller.appspot.com/bug?extid=d101e12bccd4095460e7 > compiler: Debian clang version 20.1.8 > (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 > patch: > https://syzkaller.appspot.com/x/patch.diff?x=165fd734580000 > >
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