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WARNING in __mptcp_move_skbs_from_subflow (2)

Status: upstream: reported C repro on 2024/07/29 14:54
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+81e100c8db9c0ea5a016@syzkaller.appspotmail.com
First crash: 176d, last: 92d
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2024/10/20 linux-5.15.y (ToT) 584a40a22cb9 C [report] WARNING in __mptcp_move_skbs_from_subflow
2024/10/20 upstream (ToT) c55228220dd3 C Didn't crash
▶ ▼ Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in __mptcp_move_skbs_from_subflow 1 378d 378d 0/3 auto-obsoleted due to no activity on 2024/04/18 16:30
linux-5.15 WARNING in __mptcp_move_skbs_from_subflow 1 368d 368d 0/3 auto-obsoleted due to no activity on 2024/04/28 15:28
linux-6.1 WARNING in __mptcp_move_skbs_from_subflow (2) 14 91d 161d 0/3 auto-obsoleted due to no activity on 2025/01/04 07:58
upstream WARNING in __mptcp_move_skbs_from_subflow mptcp C error 90 102d 190d 28/28 fixed on 2024/11/12 23:31
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2024/12/30 10:28 22m retest repro linux-5.15.y OK log
▶ ▼ Fix bisection attempts (1)
Created Duration User Patch Repo Result
2024/10/24 16:55 58m fix candidate upstream error job log

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 4487 at net/mptcp/protocol.c:629 __mptcp_move_skbs_from_subflow+0x2cbc/0x2dac net/mptcp/protocol.c:629
Modules linked in:
CPU: 1 PID: 4487 Comm: syz.3.83 Not tainted 5.15.168-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
pstate: 40400005 (nZcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __mptcp_move_skbs_from_subflow+0x2cbc/0x2dac net/mptcp/protocol.c:629
lr : __mptcp_move_skbs_from_subflow+0x2cbc/0x2dac net/mptcp/protocol.c:629
sp : ffff800020495c90
x29: ffff800020495e20 x28: 0000000000020000 x27: 0000000000020000
x26: dfff800000000000 x25: 0000000000000000 x24: ffff0000c5e71a08
x23: 0000000000000000 x22: ffff0000d1508d70 x21: ffff0000c956684c
x20: 00000000000081e5 x19: 0000000000007d00 x18: 0000000000000102
x17: 0000000000000000 x16: ffff8000084c4250 x15: 0000000000000004
x14: 1ffff0000295606a x13: dfff800000000000 x12: 0000000000000001
x11: 0000000000000303 x10: 0000000000000000 x9 : ffff0000cc119b40
x8 : ffff800011a5f59c x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000008 x3 : ffff800011a5d8d0
x2 : 0000000000000001 x1 : 00000000000081e5 x0 : 0000000000007d00
Call trace:
 __mptcp_move_skbs_from_subflow+0x2cbc/0x2dac net/mptcp/protocol.c:629
 move_skbs_to_msk net/mptcp/protocol.c:741 [inline]
 mptcp_data_ready+0x188/0x4f4 net/mptcp/protocol.c:784
 subflow_data_ready+0x198/0x280 net/mptcp/subflow.c:1337
 tcp_data_ready+0x22c/0x454 net/ipv4/tcp_input.c:5081
 tcp_data_queue+0x1c14/0x5288 net/ipv4/tcp_input.c:5151
 tcp_rcv_established+0xa58/0x1f40 net/ipv4/tcp_input.c:6050
 tcp_v4_do_rcv+0x340/0xc70 net/ipv4/tcp_ipv4.c:1731
 tcp_v4_rcv+0x1fd8/0x2770 net/ipv4/tcp_ipv4.c:2143
 ip_protocol_deliver_rcu+0x36c/0x770 net/ipv4/ip_input.c:204
 ip_local_deliver_finish+0x1b8/0x30c net/ipv4/ip_input.c:231
 NF_HOOK+0x324/0x3d0 include/linux/netfilter.h:302
 ip_local_deliver+0x11c/0x190 net/ipv4/ip_input.c:252
 dst_input include/net/dst.h:453 [inline]
 ip_rcv_finish+0x22c/0x264 net/ipv4/ip_input.c:447
 NF_HOOK+0x324/0x3d0 include/linux/netfilter.h:302
 ip_rcv+0x78/0x98 net/ipv4/ip_input.c:566
 __netif_receive_skb_one_core net/core/dev.c:5489 [inline]
 __netif_receive_skb+0x18c/0x400 net/core/dev.c:5603
 process_backlog+0x3ec/0x7e0 net/core/dev.c:6480
 __napi_poll+0xb4/0x624 net/core/dev.c:7039
 napi_poll net/core/dev.c:7106 [inline]
 net_rx_action+0x500/0xc10 net/core/dev.c:7196
 handle_softirqs+0x384/0xdbc kernel/softirq.c:558
 __do_softirq kernel/softirq.c:592 [inline]
 do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
 do_softirq+0xfc/0x1b0 kernel/softirq.c:459
 __local_bh_enable_ip+0x298/0x470 kernel/softirq.c:383
 local_bh_enable+0x28/0x1d0 include/linux/bottom_half.h:32
 rcu_read_unlock_bh include/linux/rcupdate.h:809 [inline]
 ip_finish_output2+0xe78/0x131c net/ipv4/ip_output.c:229
 __ip_finish_output+0x1b0/0x458
 ip_finish_output+0x40/0x218 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip_output+0x330/0x49c net/ipv4/ip_output.c:430
 dst_output include/net/dst.h:443 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 __ip_queue_xmit+0xe90/0x1a04 net/ipv4/ip_output.c:532
 ip_queue_xmit+0x5c/0x78 net/ipv4/ip_output.c:546
 __tcp_transmit_skb+0x1944/0x31e8 net/ipv4/tcp_output.c:1402
 tcp_transmit_skb net/ipv4/tcp_output.c:1420 [inline]
 tcp_mtu_probe net/ipv4/tcp_output.c:2454 [inline]
 tcp_write_xmit+0x46f8/0x4dc0 net/ipv4/tcp_output.c:2630
 __tcp_push_pending_frames+0x98/0x228 net/ipv4/tcp_output.c:2890
 tcp_push+0x420/0x650 net/ipv4/tcp.c:738
 mptcp_push_release net/mptcp/protocol.c:1559 [inline]
 __mptcp_push_pending+0x5ec/0x85c net/mptcp/protocol.c:1627
 mptcp_sendmsg+0xc74/0x1a1c net/mptcp/protocol.c:1823
 inet_sendmsg+0x15c/0x290 net/ipv4/af_inet.c:836
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 __sys_sendto+0x388/0x4d0 net/socket.c:2063
 __do_sys_sendto net/socket.c:2075 [inline]
 __se_sys_sendto net/socket.c:2071 [inline]
 __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2071
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
irq event stamp: 6891
hardirqs last  enabled at (6890): [<ffff8000088d53bc>] kasan_quarantine_put+0xdc/0x204 mm/kasan/quarantine.c:231
hardirqs last disabled at (6891): [<ffff800011ab7150>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396
softirqs last  enabled at (6860): [<ffff80001066e7b8>] local_bh_enable+0x10/0x1d0 include/linux/bottom_half.h:31
softirqs last disabled at (6861): [<ffff8000081b5ce0>] __do_softirq kernel/softirq.c:592 [inline]
softirqs last disabled at (6861): [<ffff8000081b5ce0>] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
softirqs last disabled at (6861): [<ffff8000081b5ce0>] do_softirq+0xfc/0x1b0 kernel/softirq.c:459
---[ end trace 8be590e5af280727 ]---
------------[ cut here ]------------
WARNING: CPU: 1 PID: 4487 at net/mptcp/protocol.c:632 __mptcp_move_skbs_from_subflow+0x1f6c/0x2dac net/mptcp/protocol.c:632
Modules linked in:
CPU: 1 PID: 4487 Comm: syz.3.83 Tainted: G        W         5.15.168-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
pstate: 40400005 (nZcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __mptcp_move_skbs_from_subflow+0x1f6c/0x2dac net/mptcp/protocol.c:632
lr : __mptcp_move_skbs_from_subflow+0x1f6c/0x2dac net/mptcp/protocol.c:632
sp : ffff800020495c90
x29: ffff800020495e20 x28: 1fffe0001a2a1162 x27: 00000000ffff7e1b
x26: dfff800000000000 x25: 0000000000009955 x24: ffff0000c5e71a08
x23: 0000000000000000 x22: 0000000000000000 x21: 0000000034181ddd
x20: ffff0000d1508ae8 x19: ffff0000c95661c0 x18: 0000000000000102
x17: 0000000000000000 x16: ffff8000084c4250 x15: ffff80000fe62138
x14: 1ffff0000295606a x13: dfff800000000000 x12: ffff700004092bb4
x11: 0000000000000303 x10: 0000000000000000 x9 : ffff0000cc119b40
x8 : ffff800011a5e84c x7 : ffff800011a51c28 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff800008305408
x2 : ffff800020495ea0 x1 : 00000000ffff7e1b x0 : 0000000000001770
Call trace:
 __mptcp_move_skbs_from_subflow+0x1f6c/0x2dac net/mptcp/protocol.c:632
 move_skbs_to_msk net/mptcp/protocol.c:741 [inline]
 mptcp_data_ready+0x188/0x4f4 net/mptcp/protocol.c:784
 subflow_data_ready+0x198/0x280 net/mptcp/subflow.c:1337
 tcp_data_ready+0x22c/0x454 net/ipv4/tcp_input.c:5081
 tcp_data_queue+0x1c14/0x5288 net/ipv4/tcp_input.c:5151
 tcp_rcv_established+0xa58/0x1f40 net/ipv4/tcp_input.c:6050
 tcp_v4_do_rcv+0x340/0xc70 net/ipv4/tcp_ipv4.c:1731
 tcp_v4_rcv+0x1fd8/0x2770 net/ipv4/tcp_ipv4.c:2143
 ip_protocol_deliver_rcu+0x36c/0x770 net/ipv4/ip_input.c:204
 ip_local_deliver_finish+0x1b8/0x30c net/ipv4/ip_input.c:231
 NF_HOOK+0x324/0x3d0 include/linux/netfilter.h:302
 ip_local_deliver+0x11c/0x190 net/ipv4/ip_input.c:252
 dst_input include/net/dst.h:453 [inline]
 ip_rcv_finish+0x22c/0x264 net/ipv4/ip_input.c:447
 NF_HOOK+0x324/0x3d0 include/linux/netfilter.h:302
 ip_rcv+0x78/0x98 net/ipv4/ip_input.c:566
 __netif_receive_skb_one_core net/core/dev.c:5489 [inline]
 __netif_receive_skb+0x18c/0x400 net/core/dev.c:5603
 process_backlog+0x3ec/0x7e0 net/core/dev.c:6480
 __napi_poll+0xb4/0x624 net/core/dev.c:7039
 napi_poll net/core/dev.c:7106 [inline]
 net_rx_action+0x500/0xc10 net/core/dev.c:7196
 handle_softirqs+0x384/0xdbc kernel/softirq.c:558
 __do_softirq kernel/softirq.c:592 [inline]
 do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
 do_softirq+0xfc/0x1b0 kernel/softirq.c:459
 __local_bh_enable_ip+0x298/0x470 kernel/softirq.c:383
 local_bh_enable+0x28/0x1d0 include/linux/bottom_half.h:32
 rcu_read_unlock_bh include/linux/rcupdate.h:809 [inline]
 ip_finish_output2+0xe78/0x131c net/ipv4/ip_output.c:229
 __ip_finish_output+0x1b0/0x458
 ip_finish_output+0x40/0x218 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip_output+0x330/0x49c net/ipv4/ip_output.c:430
 dst_output include/net/dst.h:443 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 __ip_queue_xmit+0xe90/0x1a04 net/ipv4/ip_output.c:532
 ip_queue_xmit+0x5c/0x78 net/ipv4/ip_output.c:546
 __tcp_transmit_skb+0x1944/0x31e8 net/ipv4/tcp_output.c:1402
 tcp_transmit_skb net/ipv4/tcp_output.c:1420 [inline]
 tcp_write_xmit+0x12bc/0x4dc0 net/ipv4/tcp_output.c:2705
 __tcp_push_pending_frames+0x98/0x228 net/ipv4/tcp_output.c:2890
 tcp_push+0x420/0x650 net/ipv4/tcp.c:738
 mptcp_push_release net/mptcp/protocol.c:1559 [inline]
 __mptcp_push_pending+0x5ec/0x85c net/mptcp/protocol.c:1627
 mptcp_sendmsg+0xc74/0x1a1c net/mptcp/protocol.c:1823
 inet_sendmsg+0x15c/0x290 net/ipv4/af_inet.c:836
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 __sys_sendto+0x388/0x4d0 net/socket.c:2063
 __do_sys_sendto net/socket.c:2075 [inline]
 __se_sys_sendto net/socket.c:2071 [inline]
 __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2071
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
irq event stamp: 7043
hardirqs last  enabled at (7042): [<ffff800011b923d0>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
hardirqs last  enabled at (7042): [<ffff800011b923d0>] _raw_spin_unlock_irqrestore+0xac/0x158 kernel/locking/spinlock.c:194
hardirqs last disabled at (7043): [<ffff800011ab7150>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396
softirqs last  enabled at (7014): [<ffff80001066e7b8>] local_bh_enable+0x10/0x1d0 include/linux/bottom_half.h:31
softirqs last disabled at (7015): [<ffff8000081b5ce0>] __do_softirq kernel/softirq.c:592 [inline]
softirqs last disabled at (7015): [<ffff8000081b5ce0>] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
softirqs last disabled at (7015): [<ffff8000081b5ce0>] do_softirq+0xfc/0x1b0 kernel/softirq.c:459
---[ end trace 8be590e5af280728 ]---

Crashes (8):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/10/19 04:22 linux-5.15.y 584a40a22cb9 cd6fc0a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in __mptcp_move_skbs_from_subflow
2024/10/19 04:22 linux-5.15.y 584a40a22cb9 cd6fc0a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in __mptcp_move_skbs_from_subflow
2024/10/18 15:29 linux-5.15.y 584a40a22cb9 666f77ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in __mptcp_move_skbs_from_subflow
2024/10/18 15:27 linux-5.15.y 584a40a22cb9 666f77ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in __mptcp_move_skbs_from_subflow
2024/10/18 15:25 linux-5.15.y 584a40a22cb9 666f77ed .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in __mptcp_move_skbs_from_subflow
2024/10/18 14:46 linux-5.15.y 584a40a22cb9 666f77ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in __mptcp_move_skbs_from_subflow
2024/09/26 23:34 linux-5.15.y 3a5928702e71 9314348a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in __mptcp_move_skbs_from_subflow
2024/07/29 14:53 linux-5.15.y 7e89efd3ae1c 5187fc86 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in __mptcp_move_skbs_from_subflow
* Struck through repros no longer work on HEAD.