* [syzbot] [tipc?] KMSAN: uninit-value in tipc_rcv (2)
@ 2025-07-23 14:45 syzbot
2025-08-03 9:39 ` syzbot
0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2025-07-23 14:45 UTC (permalink / raw)
To: davem, edumazet, horms, jmaloy, kuba, linux-kernel, netdev,
pabeni, syzkaller-bugs, tipc-discussion
Hello,
syzbot found the following issue on:
HEAD commit: 4871b7cb27f4 Merge tag 'v6.16-rc6-smb3-client-fixes' of gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15bbe38c580000
kernel config: https://syzkaller.appspot.com/x/.config?x=5227c65742122bdd
dashboard link: https://syzkaller.appspot.com/bug?extid=9a4fbb77c9d4aacd3388
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
userspace arch: i386
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/e2e34a7999ba/disk-4871b7cb.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/834fdc8dbc07/vmlinux-4871b7cb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/617fadfb9a8e/bzImage-4871b7cb.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9a4fbb77c9d4aacd3388@syzkaller.appspotmail.com
=====================================================
BUG: KMSAN: uninit-value in tipc_rcv+0x17fa/0x1ea0 net/tipc/node.c:2132
tipc_rcv+0x17fa/0x1ea0 net/tipc/node.c:2132
tipc_l2_rcv_msg+0x213/0x320 net/tipc/bearer.c:668
__netif_receive_skb_list_ptype net/core/dev.c:6025 [inline]
__netif_receive_skb_list_core+0x133b/0x16b0 net/core/dev.c:6067
__netif_receive_skb_list net/core/dev.c:6119 [inline]
netif_receive_skb_list_internal+0xee7/0x1530 net/core/dev.c:6210
gro_normal_list include/net/gro.h:532 [inline]
napi_complete_done+0x3fb/0x7d0 net/core/dev.c:6580
napi_complete include/linux/netdevice.h:588 [inline]
tun_get_user+0x4ac4/0x6b40 drivers/net/tun.c:1909
tun_chr_write_iter+0x3e9/0x5c0 drivers/net/tun.c:1984
do_iter_readv_writev+0x94a/0xba0 fs/read_write.c:-1
vfs_writev+0x52a/0x1500 fs/read_write.c:1057
do_writev+0x1b5/0x580 fs/read_write.c:1103
__do_sys_writev fs/read_write.c:1171 [inline]
__se_sys_writev fs/read_write.c:1168 [inline]
__ia32_sys_writev+0x9c/0xf0 fs/read_write.c:1168
ia32_sys_call+0x3f2a/0x42c0 arch/x86/include/generated/asm/syscalls_32.h:147
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0xb0/0x150 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331
do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
Uninit was created at:
slab_post_alloc_hook mm/slub.c:4154 [inline]
slab_alloc_node mm/slub.c:4197 [inline]
kmem_cache_alloc_node_noprof+0x818/0xf00 mm/slub.c:4249
kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:579
__alloc_skb+0x347/0x7d0 net/core/skbuff.c:670
napi_alloc_skb+0xc1/0x740 net/core/skbuff.c:812
napi_get_frags+0xab/0x250 net/core/gro.c:673
tun_napi_alloc_frags drivers/net/tun.c:1404 [inline]
tun_get_user+0x1246/0x6b40 drivers/net/tun.c:1772
tun_chr_write_iter+0x3e9/0x5c0 drivers/net/tun.c:1984
do_iter_readv_writev+0x94a/0xba0 fs/read_write.c:-1
vfs_writev+0x52a/0x1500 fs/read_write.c:1057
do_writev+0x1b5/0x580 fs/read_write.c:1103
__do_sys_writev fs/read_write.c:1171 [inline]
__se_sys_writev fs/read_write.c:1168 [inline]
__ia32_sys_writev+0x9c/0xf0 fs/read_write.c:1168
ia32_sys_call+0x3f2a/0x42c0 arch/x86/include/generated/asm/syscalls_32.h:147
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0xb0/0x150 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x38/0x80 arch/x86/entry/syscall_32.c:331
do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:369
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
CPU: 0 UID: 0 PID: 15202 Comm: syz.3.3410 Not tainted 6.16.0-rc6-syzkaller-00253-g4871b7cb27f4 #0 PREEMPT(none)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
=====================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [syzbot] [tipc?] KMSAN: uninit-value in tipc_rcv (2)
2025-07-23 14:45 [syzbot] [tipc?] KMSAN: uninit-value in tipc_rcv (2) syzbot
@ 2025-08-03 9:39 ` syzbot
0 siblings, 0 replies; 2+ messages in thread
From: syzbot @ 2025-08-03 9:39 UTC (permalink / raw)
To: davem, edumazet, horms, jmaloy, kuba, linux-kernel, netdev,
pabeni, syzkaller-bugs, tipc-discussion
syzbot has found a reproducer for the following issue on:
HEAD commit: 89748acdf226 Merge tag 'drm-next-2025-08-01' of https://gi..
git tree: upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=1395bcf0580000
kernel config: https://syzkaller.appspot.com/x/.config?x=7ff65239b4835001
dashboard link: https://syzkaller.appspot.com/bug?extid=9a4fbb77c9d4aacd3388
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1625ff82580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=131bb834580000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ce090dd92dc2/disk-89748acd.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/32b5903a7759/vmlinux-89748acd.xz
kernel image: https://storage.googleapis.com/syzbot-assets/dc68a867773d/bzImage-89748acd.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9a4fbb77c9d4aacd3388@syzkaller.appspotmail.com
tipc: Started in network mode
tipc: Node identity 4689370d27fe, cluster identity 4711
tipc: Enabled bearer <eth:syzkaller0>, priority 0
=====================================================
BUG: KMSAN: uninit-value in tipc_rcv+0x17fa/0x1ea0 net/tipc/node.c:2132
tipc_rcv+0x17fa/0x1ea0 net/tipc/node.c:2132
tipc_l2_rcv_msg+0x213/0x320 net/tipc/bearer.c:668
__netif_receive_skb_list_ptype net/core/dev.c:6027 [inline]
__netif_receive_skb_list_core+0x133b/0x16b0 net/core/dev.c:6069
__netif_receive_skb_list net/core/dev.c:6121 [inline]
netif_receive_skb_list_internal+0xee7/0x1530 net/core/dev.c:6212
gro_normal_list include/net/gro.h:532 [inline]
gro_flush_normal include/net/gro.h:540 [inline]
napi_complete_done+0x3fb/0x7d0 net/core/dev.c:6581
napi_complete include/linux/netdevice.h:589 [inline]
tun_get_user+0x4c0d/0x6ca0 drivers/net/tun.c:1921
tun_chr_write_iter+0x3e9/0x5c0 drivers/net/tun.c:1996
do_iter_readv_writev+0x947/0xba0 fs/read_write.c:-1
vfs_writev+0x52a/0x1500 fs/read_write.c:1057
do_writev+0x1b5/0x580 fs/read_write.c:1103
__do_sys_writev fs/read_write.c:1171 [inline]
__se_sys_writev fs/read_write.c:1168 [inline]
__x64_sys_writev+0x99/0xf0 fs/read_write.c:1168
x64_sys_call+0x24b1/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:21
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd9/0x210 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:4186 [inline]
slab_alloc_node mm/slub.c:4229 [inline]
kmem_cache_alloc_node_noprof+0x818/0xf00 mm/slub.c:4281
kmalloc_reserve+0x13c/0x4b0 net/core/skbuff.c:578
__alloc_skb+0x347/0x7d0 net/core/skbuff.c:669
napi_alloc_skb+0xc1/0x740 net/core/skbuff.c:811
napi_get_frags+0xab/0x250 net/core/gro.c:673
tun_napi_alloc_frags drivers/net/tun.c:1404 [inline]
tun_get_user+0x134f/0x6ca0 drivers/net/tun.c:1784
tun_chr_write_iter+0x3e9/0x5c0 drivers/net/tun.c:1996
do_iter_readv_writev+0x947/0xba0 fs/read_write.c:-1
vfs_writev+0x52a/0x1500 fs/read_write.c:1057
do_writev+0x1b5/0x580 fs/read_write.c:1103
__do_sys_writev fs/read_write.c:1171 [inline]
__se_sys_writev fs/read_write.c:1168 [inline]
__x64_sys_writev+0x99/0xf0 fs/read_write.c:1168
x64_sys_call+0x24b1/0x3e20 arch/x86/include/generated/asm/syscalls_64.h:21
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xd9/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
CPU: 1 UID: 0 PID: 5808 Comm: syz-executor123 Not tainted 6.16.0-syzkaller-10499-g89748acdf226 #0 PREEMPT(none)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
=====================================================
---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2025-08-03 9:39 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2025-07-23 14:45 [syzbot] [tipc?] KMSAN: uninit-value in tipc_rcv (2) syzbot
2025-08-03 9:39 ` syzbot
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).