syzbot

 sign-in | mailing list | source | docs | 🏰
🐞 Open [1302]
≡ Subsystems
🐞 Fixed [7211]
🐞 Invalid [19053]
⬇ Missing Backports [222]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
✨ AI
💬 Send us feedback

KMSAN: uninit-value in __skb_checksum_complete (6)

Status: closed as invalid on 2025/01/15 13:14
Subsystems: net
[Documentation on labels]
First crash: 594d, last: 582d
▶ ▼ Similar bugs (6)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in __skb_checksum_complete (3) netfilter 7 7 2631d 2798d 0/29 auto-closed as invalid on 2019/10/19 05:22
upstream KMSAN: uninit-value in __skb_checksum_complete (5) net 7 C 1497 1038d 2151d 0/29 auto-obsoleted due to no activity on 2024/02/04 15:28
upstream KMSAN: uninit-value in __skb_checksum_complete (2) net 7 2 2923d 2924d 0/29 closed as invalid on 2018/09/05 16:20
upstream KMSAN: uninit-value in __skb_checksum_complete (4) netfilter 7 C 420 2174d 2416d 0/29 closed as invalid on 2020/07/22 16:42
upstream KMSAN: uninit-value in __skb_checksum_complete net 7 C 5 2996d 2997d 0/29 closed as invalid on 2018/04/22 15:44
upstream KMSAN: uninit-value in __skb_checksum_complete (7) prio:low netfilter 7 4 90d 152d 0/29 closed as invalid on 2026/06/12 17:46

Sample crash report:
=====================================================
BUG: KMSAN: uninit-value in __skb_checksum_complete+0x349/0x490 net/core/skbuff.c:3704
 __skb_checksum_complete+0x349/0x490 net/core/skbuff.c:3704
 __skb_checksum_validate_complete include/linux/skbuff.h:4673 [inline]
 icmp_rcv+0xc5e/0x2790 net/ipv4/icmp.c:1229
 ip_protocol_deliver_rcu+0xb51/0x13d0 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x336/0x500 net/ipv4/ip_input.c:233
 NF_HOOK include/linux/netfilter.h:314 [inline]
 ip_local_deliver+0x21f/0x490 net/ipv4/ip_input.c:254
 dst_input include/net/dst.h:460 [inline]
 ip_rcv_finish+0x4a2/0x520 net/ipv4/ip_input.c:447
 NF_HOOK include/linux/netfilter.h:314 [inline]
 ip_rcv+0xcd/0x380 net/ipv4/ip_input.c:567
 __netif_receive_skb_one_core net/core/dev.c:5672 [inline]
 __netif_receive_skb+0x319/0xa00 net/core/dev.c:5785
 process_backlog+0x4ad/0xa50 net/core/dev.c:6117
 __napi_poll+0xe7/0x980 net/core/dev.c:6877
 napi_poll net/core/dev.c:6946 [inline]
 net_rx_action+0xa5a/0x19b0 net/core/dev.c:7068
 handle_softirqs+0x1a0/0x7c0 kernel/softirq.c:554
 __do_softirq+0x14/0x1a kernel/softirq.c:588
 do_softirq+0x9a/0x100 kernel/softirq.c:455
 __local_bh_enable_ip+0x9f/0xb0 kernel/softirq.c:382
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:919 [inline]
 __dev_queue_xmit+0x2758/0x57d0 net/core/dev.c:4461
 dev_queue_xmit include/linux/netdevice.h:3168 [inline]
 neigh_hh_output include/net/neighbour.h:523 [inline]
 neigh_output include/net/neighbour.h:537 [inline]
 ip_finish_output2+0x187c/0x1b70 net/ipv4/ip_output.c:236
 __ip_finish_output+0x287/0x810
 ip_finish_output+0x4b/0x600 net/ipv4/ip_output.c:324
 NF_HOOK_COND include/linux/netfilter.h:303 [inline]
 ip_output+0x15f/0x3f0 net/ipv4/ip_output.c:434
 dst_output include/net/dst.h:450 [inline]
 ip_local_out net/ipv4/ip_output.c:130 [inline]
 __ip_queue_xmit+0x1f2a/0x20d0 net/ipv4/ip_output.c:536
 ip_queue_xmit+0x60/0x80 net/ipv4/ip_output.c:550
 __tcp_transmit_skb+0x3cea/0x4900 net/ipv4/tcp_output.c:1466
 tcp_transmit_skb net/ipv4/tcp_output.c:1484 [inline]
 tcp_write_xmit+0x3b90/0x9070 net/ipv4/tcp_output.c:2827
 __tcp_push_pending_frames+0xc4/0x380 net/ipv4/tcp_output.c:3010
 tcp_push+0x755/0x7a0 net/ipv4/tcp.c:751
 tcp_sendmsg_locked+0x6288/0x6e60 net/ipv4/tcp.c:1326
 tcp_sendmsg+0x49/0x90 net/ipv4/tcp.c:1358
 inet_sendmsg+0x142/0x280 net/ipv4/af_inet.c:851
 sock_sendmsg_nosec net/socket.c:711 [inline]
 __sock_sendmsg+0x267/0x380 net/socket.c:726
 sock_write_iter+0x365/0x3d0 net/socket.c:1147
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0xb2b/0x1540 fs/read_write.c:679
 ksys_write+0x240/0x4b0 fs/read_write.c:731
 __do_sys_write fs/read_write.c:742 [inline]
 __se_sys_write fs/read_write.c:739 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:739
 x64_sys_call+0x3161/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

<Zero or more stacks not recorded to save memory>

Uninit was stored to memory at:
 pskb_expand_head+0x305/0x1a60 net/core/skbuff.c:2283
 __skb_cow include/linux/skbuff.h:3740 [inline]
 skb_cow_head include/linux/skbuff.h:3774 [inline]
 erspan_xmit+0x8e2/0x1cd0 net/ipv4/ip_gre.c:715
 __netdev_start_xmit include/linux/netdevice.h:5002 [inline]
 netdev_start_xmit include/linux/netdevice.h:5011 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3606
 sch_direct_xmit+0x399/0xd40 net/sched/sch_generic.c:343
 qdisc_restart net/sched/sch_generic.c:408 [inline]
 __qdisc_run+0x14da/0x35d0 net/sched/sch_generic.c:416
 __dev_xmit_skb net/core/dev.c:3829 [inline]
 __dev_queue_xmit+0x3154/0x57d0 net/core/dev.c:4400
 bond_start_xmit+0x1c61/0x24f0 drivers/net/bonding/bond_main.c:5605
 __netdev_start_xmit include/linux/netdevice.h:5002 [inline]
 netdev_start_xmit include/linux/netdevice.h:5011 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3606
 __dev_queue_xmit+0x366a/0x57d0 net/core/dev.c:4434
 dev_queue_xmit include/linux/netdevice.h:3168 [inline]
 neigh_hh_output include/net/neighbour.h:523 [inline]
 neigh_output include/net/neighbour.h:537 [inline]
 ip_finish_output2+0x187c/0x1b70 net/ipv4/ip_output.c:236
 __ip_finish_output+0x287/0x810
 ip_finish_output+0x4b/0x600 net/ipv4/ip_output.c:324
 NF_HOOK_COND include/linux/netfilter.h:303 [inline]
 ip_output+0x15f/0x3f0 net/ipv4/ip_output.c:434
 dst_output include/net/dst.h:450 [inline]
 ip_local_out net/ipv4/ip_output.c:130 [inline]
 __ip_queue_xmit+0x1f2a/0x20d0 net/ipv4/ip_output.c:536
 ip_queue_xmit+0x60/0x80 net/ipv4/ip_output.c:550
 __tcp_transmit_skb+0x3cea/0x4900 net/ipv4/tcp_output.c:1466
 tcp_transmit_skb net/ipv4/tcp_output.c:1484 [inline]
 tcp_write_xmit+0x3b90/0x9070 net/ipv4/tcp_output.c:2827
 __tcp_push_pending_frames+0xc4/0x380 net/ipv4/tcp_output.c:3010
 tcp_push+0x755/0x7a0 net/ipv4/tcp.c:751
 tcp_sendmsg_locked+0x6288/0x6e60 net/ipv4/tcp.c:1326
 tcp_sendmsg+0x49/0x90 net/ipv4/tcp.c:1358
 inet_sendmsg+0x142/0x280 net/ipv4/af_inet.c:851
 sock_sendmsg_nosec net/socket.c:711 [inline]
 __sock_sendmsg+0x267/0x380 net/socket.c:726
 sock_write_iter+0x365/0x3d0 net/socket.c:1147
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0xb2b/0x1540 fs/read_write.c:679
 ksys_write+0x240/0x4b0 fs/read_write.c:731
 __do_sys_write fs/read_write.c:742 [inline]
 __se_sys_write fs/read_write.c:739 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:739
 x64_sys_call+0x3161/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 pskb_expand_head+0x305/0x1a60 net/core/skbuff.c:2283
 __skb_cow include/linux/skbuff.h:3740 [inline]
 skb_cow_head include/linux/skbuff.h:3774 [inline]
 erspan_xmit+0x8e2/0x1cd0 net/ipv4/ip_gre.c:715
 __netdev_start_xmit include/linux/netdevice.h:5002 [inline]
 netdev_start_xmit include/linux/netdevice.h:5011 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3606
 sch_direct_xmit+0x399/0xd40 net/sched/sch_generic.c:343
 qdisc_restart net/sched/sch_generic.c:408 [inline]
 __qdisc_run+0x14da/0x35d0 net/sched/sch_generic.c:416
 __dev_xmit_skb net/core/dev.c:3829 [inline]
 __dev_queue_xmit+0x3154/0x57d0 net/core/dev.c:4400
 bond_start_xmit+0x1c61/0x24f0 drivers/net/bonding/bond_main.c:5605
 __netdev_start_xmit include/linux/netdevice.h:5002 [inline]
 netdev_start_xmit include/linux/netdevice.h:5011 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3606
 __dev_queue_xmit+0x366a/0x57d0 net/core/dev.c:4434
 dev_queue_xmit include/linux/netdevice.h:3168 [inline]
 neigh_hh_output include/net/neighbour.h:523 [inline]
 neigh_output include/net/neighbour.h:537 [inline]
 ip_finish_output2+0x187c/0x1b70 net/ipv4/ip_output.c:236
 __ip_finish_output+0x287/0x810
 ip_finish_output+0x4b/0x600 net/ipv4/ip_output.c:324
 NF_HOOK_COND include/linux/netfilter.h:303 [inline]
 ip_output+0x15f/0x3f0 net/ipv4/ip_output.c:434
 dst_output include/net/dst.h:450 [inline]
 ip_local_out net/ipv4/ip_output.c:130 [inline]
 __ip_queue_xmit+0x1f2a/0x20d0 net/ipv4/ip_output.c:536
 ip_queue_xmit+0x60/0x80 net/ipv4/ip_output.c:550
 __tcp_transmit_skb+0x3cea/0x4900 net/ipv4/tcp_output.c:1466
 tcp_transmit_skb net/ipv4/tcp_output.c:1484 [inline]
 tcp_write_xmit+0x3b90/0x9070 net/ipv4/tcp_output.c:2827
 __tcp_push_pending_frames+0xc4/0x380 net/ipv4/tcp_output.c:3010
 tcp_push+0x755/0x7a0 net/ipv4/tcp.c:751
 tcp_sendmsg_locked+0x6288/0x6e60 net/ipv4/tcp.c:1326
 tcp_sendmsg+0x49/0x90 net/ipv4/tcp.c:1358
 inet_sendmsg+0x142/0x280 net/ipv4/af_inet.c:851
 sock_sendmsg_nosec net/socket.c:711 [inline]
 __sock_sendmsg+0x267/0x380 net/socket.c:726
 sock_write_iter+0x365/0x3d0 net/socket.c:1147
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0xb2b/0x1540 fs/read_write.c:679
 ksys_write+0x240/0x4b0 fs/read_write.c:731
 __do_sys_write fs/read_write.c:742 [inline]
 __se_sys_write fs/read_write.c:739 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:739
 x64_sys_call+0x3161/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 pskb_expand_head+0x305/0x1a60 net/core/skbuff.c:2283
 __skb_cow include/linux/skbuff.h:3740 [inline]
 skb_cow_head include/linux/skbuff.h:3774 [inline]
 ip_tunnel_xmit+0x3644/0x3ec0 net/ipv4/ip_tunnel.c:849
 __gre_xmit+0x19f/0x220 net/ipv4/ip_gre.c:484
 erspan_xmit+0x12cb/0x1cd0 net/ipv4/ip_gre.c:743
 __netdev_start_xmit include/linux/netdevice.h:5002 [inline]
 netdev_start_xmit include/linux/netdevice.h:5011 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3606
 sch_direct_xmit+0x399/0xd40 net/sched/sch_generic.c:343
 qdisc_restart net/sched/sch_generic.c:408 [inline]
 __qdisc_run+0x14da/0x35d0 net/sched/sch_generic.c:416
 __dev_xmit_skb net/core/dev.c:3829 [inline]
 __dev_queue_xmit+0x3154/0x57d0 net/core/dev.c:4400
 bond_start_xmit+0x1c61/0x24f0 drivers/net/bonding/bond_main.c:5605
 __netdev_start_xmit include/linux/netdevice.h:5002 [inline]
 netdev_start_xmit include/linux/netdevice.h:5011 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3606
 __dev_queue_xmit+0x366a/0x57d0 net/core/dev.c:4434
 dev_queue_xmit include/linux/netdevice.h:3168 [inline]
 neigh_hh_output include/net/neighbour.h:523 [inline]
 neigh_output include/net/neighbour.h:537 [inline]
 ip_finish_output2+0x187c/0x1b70 net/ipv4/ip_output.c:236
 __ip_finish_output+0x287/0x810
 ip_finish_output+0x4b/0x600 net/ipv4/ip_output.c:324
 NF_HOOK_COND include/linux/netfilter.h:303 [inline]
 ip_output+0x15f/0x3f0 net/ipv4/ip_output.c:434
 dst_output include/net/dst.h:450 [inline]
 ip_local_out net/ipv4/ip_output.c:130 [inline]
 __ip_queue_xmit+0x1f2a/0x20d0 net/ipv4/ip_output.c:536
 ip_queue_xmit+0x60/0x80 net/ipv4/ip_output.c:550
 __tcp_transmit_skb+0x3cea/0x4900 net/ipv4/tcp_output.c:1466
 tcp_transmit_skb net/ipv4/tcp_output.c:1484 [inline]
 tcp_write_xmit+0x3b90/0x9070 net/ipv4/tcp_output.c:2827
 __tcp_push_pending_frames+0xc4/0x380 net/ipv4/tcp_output.c:3010
 tcp_push+0x755/0x7a0 net/ipv4/tcp.c:751
 tcp_sendmsg_locked+0x6288/0x6e60 net/ipv4/tcp.c:1326
 tcp_sendmsg+0x49/0x90 net/ipv4/tcp.c:1358
 inet_sendmsg+0x142/0x280 net/ipv4/af_inet.c:851
 sock_sendmsg_nosec net/socket.c:711 [inline]
 __sock_sendmsg+0x267/0x380 net/socket.c:726
 sock_write_iter+0x365/0x3d0 net/socket.c:1147
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0xb2b/0x1540 fs/read_write.c:679
 ksys_write+0x240/0x4b0 fs/read_write.c:731
 __do_sys_write fs/read_write.c:742 [inline]
 __se_sys_write fs/read_write.c:739 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:739
 x64_sys_call+0x3161/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 pskb_expand_head+0x305/0x1a60 net/core/skbuff.c:2283
 __skb_cow include/linux/skbuff.h:3740 [inline]
 skb_cow_head include/linux/skbuff.h:3774 [inline]
 ip_tunnel_xmit+0x3644/0x3ec0 net/ipv4/ip_tunnel.c:849
 __gre_xmit+0x19f/0x220 net/ipv4/ip_gre.c:484
 erspan_xmit+0x12cb/0x1cd0 net/ipv4/ip_gre.c:743
 __netdev_start_xmit include/linux/netdevice.h:5002 [inline]
 netdev_start_xmit include/linux/netdevice.h:5011 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3606
 sch_direct_xmit+0x399/0xd40 net/sched/sch_generic.c:343
 qdisc_restart net/sched/sch_generic.c:408 [inline]
 __qdisc_run+0x14da/0x35d0 net/sched/sch_generic.c:416
 __dev_xmit_skb net/core/dev.c:3829 [inline]
 __dev_queue_xmit+0x3154/0x57d0 net/core/dev.c:4400
 bond_start_xmit+0x1c61/0x24f0 drivers/net/bonding/bond_main.c:5605
 __netdev_start_xmit include/linux/netdevice.h:5002 [inline]
 netdev_start_xmit include/linux/netdevice.h:5011 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3606
 __dev_queue_xmit+0x366a/0x57d0 net/core/dev.c:4434
 dev_queue_xmit include/linux/netdevice.h:3168 [inline]
 neigh_hh_output include/net/neighbour.h:523 [inline]
 neigh_output include/net/neighbour.h:537 [inline]
 ip_finish_output2+0x187c/0x1b70 net/ipv4/ip_output.c:236
 __ip_finish_output+0x287/0x810
 ip_finish_output+0x4b/0x600 net/ipv4/ip_output.c:324
 NF_HOOK_COND include/linux/netfilter.h:303 [inline]
 ip_output+0x15f/0x3f0 net/ipv4/ip_output.c:434
 dst_output include/net/dst.h:450 [inline]
 ip_local_out net/ipv4/ip_output.c:130 [inline]
 __ip_queue_xmit+0x1f2a/0x20d0 net/ipv4/ip_output.c:536
 ip_queue_xmit+0x60/0x80 net/ipv4/ip_output.c:550
 __tcp_transmit_skb+0x3cea/0x4900 net/ipv4/tcp_output.c:1466
 tcp_transmit_skb net/ipv4/tcp_output.c:1484 [inline]
 tcp_write_xmit+0x3b90/0x9070 net/ipv4/tcp_output.c:2827
 __tcp_push_pending_frames+0xc4/0x380 net/ipv4/tcp_output.c:3010
 tcp_push+0x755/0x7a0 net/ipv4/tcp.c:751
 tcp_sendmsg_locked+0x6288/0x6e60 net/ipv4/tcp.c:1326
 tcp_sendmsg+0x49/0x90 net/ipv4/tcp.c:1358
 inet_sendmsg+0x142/0x280 net/ipv4/af_inet.c:851
 sock_sendmsg_nosec net/socket.c:711 [inline]
 __sock_sendmsg+0x267/0x380 net/socket.c:726
 sock_write_iter+0x365/0x3d0 net/socket.c:1147
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0xb2b/0x1540 fs/read_write.c:679
 ksys_write+0x240/0x4b0 fs/read_write.c:731
 __do_sys_write fs/read_write.c:742 [inline]
 __se_sys_write fs/read_write.c:739 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:739
 x64_sys_call+0x3161/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 pskb_expand_head+0x305/0x1a60 net/core/skbuff.c:2283
 __skb_cow include/linux/skbuff.h:3740 [inline]
 skb_cow_head include/linux/skbuff.h:3774 [inline]
 erspan_xmit+0x8e2/0x1cd0 net/ipv4/ip_gre.c:715
 __netdev_start_xmit include/linux/netdevice.h:5002 [inline]
 netdev_start_xmit include/linux/netdevice.h:5011 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3606
 sch_direct_xmit+0x399/0xd40 net/sched/sch_generic.c:343
 qdisc_restart net/sched/sch_generic.c:408 [inline]
 __qdisc_run+0x14da/0x35d0 net/sched/sch_generic.c:416
 __dev_xmit_skb net/core/dev.c:3829 [inline]
 __dev_queue_xmit+0x3154/0x57d0 net/core/dev.c:4400
 bond_start_xmit+0x1c61/0x24f0 drivers/net/bonding/bond_main.c:5605
 __netdev_start_xmit include/linux/netdevice.h:5002 [inline]
 netdev_start_xmit include/linux/netdevice.h:5011 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3606
 __dev_queue_xmit+0x366a/0x57d0 net/core/dev.c:4434
 dev_queue_xmit include/linux/netdevice.h:3168 [inline]
 neigh_hh_output include/net/neighbour.h:523 [inline]
 neigh_output include/net/neighbour.h:537 [inline]
 ip_finish_output2+0x187c/0x1b70 net/ipv4/ip_output.c:236
 __ip_finish_output+0x287/0x810
 ip_finish_output+0x4b/0x600 net/ipv4/ip_output.c:324
 NF_HOOK_COND include/linux/netfilter.h:303 [inline]
 ip_output+0x15f/0x3f0 net/ipv4/ip_output.c:434
 dst_output include/net/dst.h:450 [inline]
 ip_local_out net/ipv4/ip_output.c:130 [inline]
 __ip_queue_xmit+0x1f2a/0x20d0 net/ipv4/ip_output.c:536
 ip_queue_xmit+0x60/0x80 net/ipv4/ip_output.c:550
 __tcp_transmit_skb+0x3cea/0x4900 net/ipv4/tcp_output.c:1466
 tcp_transmit_skb net/ipv4/tcp_output.c:1484 [inline]
 tcp_write_xmit+0x3b90/0x9070 net/ipv4/tcp_output.c:2827
 __tcp_push_pending_frames+0xc4/0x380 net/ipv4/tcp_output.c:3010
 tcp_push+0x755/0x7a0 net/ipv4/tcp.c:751
 tcp_sendmsg_locked+0x6288/0x6e60 net/ipv4/tcp.c:1326
 tcp_sendmsg+0x49/0x90 net/ipv4/tcp.c:1358
 inet_sendmsg+0x142/0x280 net/ipv4/af_inet.c:851
 sock_sendmsg_nosec net/socket.c:711 [inline]
 __sock_sendmsg+0x267/0x380 net/socket.c:726
 sock_write_iter+0x365/0x3d0 net/socket.c:1147
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0xb2b/0x1540 fs/read_write.c:679
 ksys_write+0x240/0x4b0 fs/read_write.c:731
 __do_sys_write fs/read_write.c:742 [inline]
 __se_sys_write fs/read_write.c:739 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:739
 x64_sys_call+0x3161/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 pskb_expand_head+0x305/0x1a60 net/core/skbuff.c:2283
 __skb_cow include/linux/skbuff.h:3740 [inline]
 skb_cow_head include/linux/skbuff.h:3774 [inline]
 erspan_xmit+0x8e2/0x1cd0 net/ipv4/ip_gre.c:715
 __netdev_start_xmit include/linux/netdevice.h:5002 [inline]
 netdev_start_xmit include/linux/netdevice.h:5011 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3606
 sch_direct_xmit+0x399/0xd40 net/sched/sch_generic.c:343
 qdisc_restart net/sched/sch_generic.c:408 [inline]
 __qdisc_run+0x14da/0x35d0 net/sched/sch_generic.c:416
 __dev_xmit_skb net/core/dev.c:3829 [inline]
 __dev_queue_xmit+0x3154/0x57d0 net/core/dev.c:4400
 bond_start_xmit+0x1c61/0x24f0 drivers/net/bonding/bond_main.c:5605
 __netdev_start_xmit include/linux/netdevice.h:5002 [inline]
 netdev_start_xmit include/linux/netdevice.h:5011 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3606
 __dev_queue_xmit+0x366a/0x57d0 net/core/dev.c:4434
 dev_queue_xmit include/linux/netdevice.h:3168 [inline]
 neigh_hh_output include/net/neighbour.h:523 [inline]
 neigh_output include/net/neighbour.h:537 [inline]
 ip_finish_output2+0x187c/0x1b70 net/ipv4/ip_output.c:236
 __ip_finish_output+0x287/0x810
 ip_finish_output+0x4b/0x600 net/ipv4/ip_output.c:324
 NF_HOOK_COND include/linux/netfilter.h:303 [inline]
 ip_output+0x15f/0x3f0 net/ipv4/ip_output.c:434
 dst_output include/net/dst.h:450 [inline]
 ip_local_out net/ipv4/ip_output.c:130 [inline]
 __ip_queue_xmit+0x1f2a/0x20d0 net/ipv4/ip_output.c:536
 ip_queue_xmit+0x60/0x80 net/ipv4/ip_output.c:550
 __tcp_transmit_skb+0x3cea/0x4900 net/ipv4/tcp_output.c:1466
 tcp_transmit_skb net/ipv4/tcp_output.c:1484 [inline]
 tcp_write_xmit+0x3b90/0x9070 net/ipv4/tcp_output.c:2827
 __tcp_push_pending_frames+0xc4/0x380 net/ipv4/tcp_output.c:3010
 tcp_push+0x755/0x7a0 net/ipv4/tcp.c:751
 tcp_sendmsg_locked+0x6288/0x6e60 net/ipv4/tcp.c:1326
 tcp_sendmsg+0x49/0x90 net/ipv4/tcp.c:1358
 inet_sendmsg+0x142/0x280 net/ipv4/af_inet.c:851
 sock_sendmsg_nosec net/socket.c:711 [inline]
 __sock_sendmsg+0x267/0x380 net/socket.c:726
 sock_write_iter+0x365/0x3d0 net/socket.c:1147
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0xb2b/0x1540 fs/read_write.c:679
 ksys_write+0x240/0x4b0 fs/read_write.c:731
 __do_sys_write fs/read_write.c:742 [inline]
 __se_sys_write fs/read_write.c:739 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:739
 x64_sys_call+0x3161/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 pskb_expand_head+0x305/0x1a60 net/core/skbuff.c:2283
 __skb_cow include/linux/skbuff.h:3740 [inline]
 skb_cow_head include/linux/skbuff.h:3774 [inline]
 ip_tunnel_xmit+0x3644/0x3ec0 net/ipv4/ip_tunnel.c:849
 __gre_xmit+0x19f/0x220 net/ipv4/ip_gre.c:484
 erspan_xmit+0x12cb/0x1cd0 net/ipv4/ip_gre.c:743
 __netdev_start_xmit include/linux/netdevice.h:5002 [inline]
 netdev_start_xmit include/linux/netdevice.h:5011 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3606
 sch_direct_xmit+0x399/0xd40 net/sched/sch_generic.c:343
 qdisc_restart net/sched/sch_generic.c:408 [inline]
 __qdisc_run+0x14da/0x35d0 net/sched/sch_generic.c:416
 __dev_xmit_skb net/core/dev.c:3829 [inline]
 __dev_queue_xmit+0x3154/0x57d0 net/core/dev.c:4400
 bond_start_xmit+0x1c61/0x24f0 drivers/net/bonding/bond_main.c:5605
 __netdev_start_xmit include/linux/netdevice.h:5002 [inline]
 netdev_start_xmit include/linux/netdevice.h:5011 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3606
 __dev_queue_xmit+0x366a/0x57d0 net/core/dev.c:4434
 dev_queue_xmit include/linux/netdevice.h:3168 [inline]
 neigh_hh_output include/net/neighbour.h:523 [inline]
 neigh_output include/net/neighbour.h:537 [inline]
 ip_finish_output2+0x187c/0x1b70 net/ipv4/ip_output.c:236
 __ip_finish_output+0x287/0x810
 ip_finish_output+0x4b/0x600 net/ipv4/ip_output.c:324
 NF_HOOK_COND include/linux/netfilter.h:303 [inline]
 ip_output+0x15f/0x3f0 net/ipv4/ip_output.c:434
 dst_output include/net/dst.h:450 [inline]
 ip_local_out net/ipv4/ip_output.c:130 [inline]
 __ip_queue_xmit+0x1f2a/0x20d0 net/ipv4/ip_output.c:536
 ip_queue_xmit+0x60/0x80 net/ipv4/ip_output.c:550
 __tcp_transmit_skb+0x3cea/0x4900 net/ipv4/tcp_output.c:1466
 tcp_transmit_skb net/ipv4/tcp_output.c:1484 [inline]
 tcp_write_xmit+0x3b90/0x9070 net/ipv4/tcp_output.c:2827
 __tcp_push_pending_frames+0xc4/0x380 net/ipv4/tcp_output.c:3010
 tcp_push+0x755/0x7a0 net/ipv4/tcp.c:751
 tcp_sendmsg_locked+0x6288/0x6e60 net/ipv4/tcp.c:1326
 tcp_sendmsg+0x49/0x90 net/ipv4/tcp.c:1358
 inet_sendmsg+0x142/0x280 net/ipv4/af_inet.c:851
 sock_sendmsg_nosec net/socket.c:711 [inline]
 __sock_sendmsg+0x267/0x380 net/socket.c:726
 sock_write_iter+0x365/0x3d0 net/socket.c:1147
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0xb2b/0x1540 fs/read_write.c:679
 ksys_write+0x240/0x4b0 fs/read_write.c:731
 __do_sys_write fs/read_write.c:742 [inline]
 __se_sys_write fs/read_write.c:739 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:739
 x64_sys_call+0x3161/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4110 [inline]
 slab_alloc_node mm/slub.c:4153 [inline]
 kmem_cache_alloc_node_noprof+0x907/0xe00 mm/slub.c:4205
 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:587
 __alloc_skb+0x363/0x7b0 net/core/skbuff.c:678
 skb_segment+0x20df/0x7260 net/core/skbuff.c:4859
 tcp_gso_segment+0x818/0x2e70 net/ipv4/tcp_offload.c:176
 tcp4_gso_segment+0xbfd/0x1b90 net/ipv4/tcp_offload.c:126
 inet_gso_segment+0xcae/0x1fd0 net/ipv4/af_inet.c:1420
 skb_mac_gso_segment+0x435/0x800 net/core/gso.c:53
 __skb_gso_segment+0x682/0x840 net/core/gso.c:124
 skb_gso_segment include/net/gso.h:83 [inline]
 validate_xmit_skb+0xca8/0x17b0 net/core/dev.c:3675
 validate_xmit_skb_list+0xf4/0x2f0 net/core/dev.c:3725
 sch_direct_xmit+0xd0/0xd40 net/sched/sch_generic.c:328
 __dev_xmit_skb net/core/dev.c:3827 [inline]
 __dev_queue_xmit+0x30b9/0x57d0 net/core/dev.c:4400
 bond_start_xmit+0x1c61/0x24f0 drivers/net/bonding/bond_main.c:5605
 __netdev_start_xmit include/linux/netdevice.h:5002 [inline]
 netdev_start_xmit include/linux/netdevice.h:5011 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3606
 __dev_queue_xmit+0x366a/0x57d0 net/core/dev.c:4434
 dev_queue_xmit include/linux/netdevice.h:3168 [inline]
 neigh_hh_output include/net/neighbour.h:523 [inline]
 neigh_output include/net/neighbour.h:537 [inline]
 ip_finish_output2+0x187c/0x1b70 net/ipv4/ip_output.c:236
 __ip_finish_output+0x287/0x810
 ip_finish_output+0x4b/0x600 net/ipv4/ip_output.c:324
 NF_HOOK_COND include/linux/netfilter.h:303 [inline]
 ip_output+0x15f/0x3f0 net/ipv4/ip_output.c:434
 dst_output include/net/dst.h:450 [inline]
 ip_local_out net/ipv4/ip_output.c:130 [inline]
 __ip_queue_xmit+0x1f2a/0x20d0 net/ipv4/ip_output.c:536
 ip_queue_xmit+0x60/0x80 net/ipv4/ip_output.c:550
 __tcp_transmit_skb+0x3cea/0x4900 net/ipv4/tcp_output.c:1466
 tcp_transmit_skb net/ipv4/tcp_output.c:1484 [inline]
 tcp_write_xmit+0x3b90/0x9070 net/ipv4/tcp_output.c:2827
 __tcp_push_pending_frames+0xc4/0x380 net/ipv4/tcp_output.c:3010
 tcp_push+0x755/0x7a0 net/ipv4/tcp.c:751
 tcp_sendmsg_locked+0x6288/0x6e60 net/ipv4/tcp.c:1326
 tcp_sendmsg+0x49/0x90 net/ipv4/tcp.c:1358
 inet_sendmsg+0x142/0x280 net/ipv4/af_inet.c:851
 sock_sendmsg_nosec net/socket.c:711 [inline]
 __sock_sendmsg+0x267/0x380 net/socket.c:726
 sock_write_iter+0x365/0x3d0 net/socket.c:1147
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0xb2b/0x1540 fs/read_write.c:679
 ksys_write+0x240/0x4b0 fs/read_write.c:731
 __do_sys_write fs/read_write.c:742 [inline]
 __se_sys_write fs/read_write.c:739 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:739
 x64_sys_call+0x3161/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 5771 Comm: syz-executor Tainted: G        W          6.12.0-syzkaller-11677-g2ba9f676d0a2 #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
=====================================================

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/11/30 10:29 upstream 2ba9f676d0a2 68914665 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in __skb_checksum_complete
2024/11/18 12:26 upstream adc218676eef 571351cb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in __skb_checksum_complete
2024/11/17 20:54 upstream f66d6acccbc0 cfe3a04a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in __skb_checksum_complete
* Struck through repros no longer work on HEAD.