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rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10499 ticks this GP) idle=134c/1/0x4000000000000000 softirq=11883/1852642 fqs=5162 rcu: hardirqs softirqs csw/system rcu: number: 3780000 937838 0 rcu: cputime: 1946 48622 1912 ==> 52490(ms) rcu: (t=10500 jiffies g=9889 q=1884 ncpus=2) CPU: 1 PID: 6312 Comm: syz.2.182 Not tainted 6.6.100-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:variable_ffs arch/x86/include/asm/bitops.h:319 [inline] RIP: 0010:handle_softirqs+0x1b0/0x820 kernel/softirq.c:566 Code: 89 64 24 2c 0f b7 db 48 c7 c7 a0 b2 a9 8a e8 77 99 1b 09 65 66 c7 05 1d 25 b2 7e 00 00 e8 98 63 3a 00 fb 49 c7 c6 c0 a0 a0 8c <89> 5c 24 34 b8 ff ff ff ff 0f bc 44 24 34 41 89 c5 41 ff c5 0f 84 RSP: 0018:ffffc900001f0e40 EFLAGS: 00000286 RAX: fa2fb497ece5f400 RBX: 0000000000000200 RCX: fa2fb497ece5f400 RDX: dffffc0000000000 RSI: ffffffff8aaaba40 RDI: ffffffff8afc6700 RBP: ffffc900001f0f50 R08: ffffffff90da3627 R09: 1ffffffff21b46c4 R10: dffffc0000000000 R11: fffffbfff21b46c5 R12: 000000000000000a R13: 0000000000000000 R14: ffffffff8ca0a0c0 R15: ffff88802c9f0000 FS: 00007f1d236c66c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1d236c5f98 CR3: 000000002e4b5000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: <IRQ> __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0xa1/0xc0 arch/x86/kernel/irq_work.c:17 </IRQ> <TASK> asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:723 RIP: 0010:preempt_schedule_irq+0xb0/0x140 kernel/sched/core.c:7010 Code: 44 24 20 f6 44 24 21 02 74 0b 0f 0b 48 f7 03 08 00 00 00 74 63 bf 01 00 00 00 e8 1b 13 e6 f6 e8 66 99 16 f7 fb bf 01 00 00 00 <e8> db b5 ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24 RSP: 0018:ffffc9000bf774e0 EFLAGS: 00000282 RAX: fa2fb497ece5f400 RBX: 0000000000000000 RCX: fa2fb497ece5f400 RDX: dffffc0000000000 RSI: ffffffff8aaaba40 RDI: 0000000000000001 RBP: ffffc9000bf77580 R08: ffffffff90da3627 R09: 1ffffffff21b46c4 R10: dffffc0000000000 R11: fffffbfff21b46c5 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff920017eee9c irqentry_exit+0x67/0x70 kernel/entry/common.c:438 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:__refcount_add include/linux/refcount.h:198 [inline] RIP: 0010:__refcount_inc include/linux/refcount.h:250 [inline] RIP: 0010:refcount_inc include/linux/refcount.h:267 [inline] RIP: 0010:get_net include/net/net_namespace.h:261 [inline] RIP: 0010:get_net_track include/net/net_namespace.h:359 [inline] RIP: 0010:mptcp_subflow_create_socket+0x643/0xc00 net/mptcp/subflow.c:1712 Code: 4c 8b 74 24 40 49 8d be 54 01 00 00 48 89 7c 24 28 be 04 00 00 00 e8 cc 99 8a f7 41 bc 01 00 00 00 f0 45 0f c1 a6 54 01 00 00 <31> ff 44 89 e6 e8 83 55 33 f7 45 85 e4 0f 84 82 03 00 00 bf fe ff RSP: 0018:ffffc9000bf77640 EFLAGS: 00000206 RAX: 0000000000000001 RBX: ffff88805cea1030 RCX: ffffffff8a524394 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff888078488154 RBP: ffffc9000bf77730 R08: ffff888078488157 R09: 1ffff1100f09102a R10: dffffc0000000000 R11: ffffed100f09102b R12: 0000000000000005 R13: ffff88802e82c238 R14: ffff888078488000 R15: 1ffff1100b9d4206 __mptcp_socket_create net/mptcp/protocol.c:75 [inline] __mptcp_nmpc_sk+0x151/0x730 net/mptcp/protocol.c:107 mptcp_sendmsg_fastopen+0x7f/0x4d0 net/mptcp/protocol.c:1739 mptcp_sendmsg+0x14a3/0x16b0 net/mptcp/protocol.c:1799 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x5bf/0x950 net/socket.c:2595 ___sys_sendmsg+0x220/0x290 net/socket.c:2649 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2687 [inline] __se_sys_sendmsg+0x1a5/0x270 net/socket.c:2685 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f1d2278eb69 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1d236c6038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f1d229b6080 RCX: 00007f1d2278eb69 RDX: 000000003000c041 RSI: 0000200000000080 RDI: 000000000000000b RBP: 00007f1d22811df1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f1d229b6080 R15: 00007ffc6c58e038 </TASK>
| Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025/07/31 17:15 | linux-6.6.y | dbcb8d8e4163 | 0c075d67 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-linux-6-6-kasan-perf | INFO: rcu detected stall in sendmsg |