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Message-ID: <00000000000077c77f060b603f2d@google.com> Date: Thu, 30 Nov 2023 07:24:29 -0800 From: syzbot <syzbot+de8e83db70e8beedd556@...kaller.appspotmail.com> To: bp@...en8.de, davem@...emloft.net, edumazet@...gle.com, hpa@...or.com, jhs@...atatu.com, jiri@...nulli.us, kuba@...nel.org, linux-kernel@...r.kernel.org, mingo@...hat.com, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com, tglx@...utronix.de, vinicius.gomes@...el.com, willemdebruijn.kernel@...il.com, x86@...nel.org, xiyou.wangcong@...il.com Subject: [syzbot] [net?] INFO: rcu detected stall in sys_socket (10) Hello, syzbot found the following issue on: HEAD commit: 18d46e76d7c2 Merge tag 'for-6.7-rc3-tag' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16bcc8b4e80000 kernel config: https://syzkaller.appspot.com/x/.config?x=bb39fe85d254f638 dashboard link: https://syzkaller.appspot.com/bug?extid=de8e83db70e8beedd556 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12172952e80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1086b58ae80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/0ce5608c89e8/disk-18d46e76.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/eef847faba9c/vmlinux-18d46e76.xz kernel image: https://storage.googleapis.com/syzbot-assets/6a3df3288860/bzImage-18d46e76.xz The issue was bisected to: commit 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22 Author: Vinicius Costa Gomes <vinicius.gomes@...el.com> Date: Sat Sep 29 00:59:43 2018 +0000 tc: Add support for configuring the taprio scheduler bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16a29b52e80000 final oops: https://syzkaller.appspot.com/x/report.txt?x=15a29b52e80000 console output: https://syzkaller.appspot.com/x/log.txt?x=11a29b52e80000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+de8e83db70e8beedd556@...kaller.appspotmail.com Fixes: 5a781ccbd19e ("tc: Add support for configuring the taprio scheduler") rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=79f4/1/0x4000000000000000 softirq=5546/5548 fqs=1 rcu: (detected by 1, t=10503 jiffies, g=5017, q=384 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 5106 Comm: syz-executor201 Not tainted 6.7.0-rc3-syzkaller-00024-g18d46e76d7c2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1686 [inline] RIP: 0010:__hrtimer_run_queues+0x62e/0xc20 kernel/time/hrtimer.c:1752 Code: fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 fb 04 00 00 45 0f b6 6e 3b 31 ff 44 89 ee <e8> 2d 46 11 00 45 84 ed 0f 84 8e fb ff ff e8 ef 4a 11 00 4c 89 f7 RSP: 0018:ffffc90000007e40 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff8880b982ba40 RCX: ffffffff817642f9 RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000002 R12: ffff8880b982b940 R13: 0000000000000000 R14: ffff88801c43a340 R15: ffffffff88a2daf0 FS: 00005555566fe380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe9404c73b0 CR3: 0000000076e2d000 CR4: 0000000000350ef0 Call Trace: <NMI> </NMI> <IRQ> hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline] __sysvec_apic_timer_interrupt+0x105/0x400 arch/x86/kernel/apic/apic.c:1082 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1076 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:lock_acquire+0x1ef/0x520 kernel/locking/lockdep.c:5722 Code: c1 05 bd 6c 9a 7e 83 f8 01 0f 85 b4 02 00 00 9c 58 f6 c4 02 0f 85 9f 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24 RSP: 0018:ffffc9000432fb00 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: 1ffff92000865f62 RCX: ffffffff81672c0e RDX: 0000000000000001 RSI: ffffffff8accbae0 RDI: ffffffff8b2f0dc0 RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff23e33d0 R10: ffffffff91f19e87 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: ffffffff8d0f0b48 R15: 0000000000000000 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x175/0x9d0 kernel/locking/mutex.c:747 pcpu_alloc+0xbb8/0x1420 mm/percpu.c:1769 packet_alloc_pending net/packet/af_packet.c:1232 [inline] packet_create+0x2b7/0x8e0 net/packet/af_packet.c:3373 __sock_create+0x328/0x800 net/socket.c:1569 sock_create net/socket.c:1620 [inline] __sys_socket_create net/socket.c:1657 [inline] __sys_socket+0x14c/0x260 net/socket.c:1704 __do_sys_socket net/socket.c:1718 [inline] __se_sys_socket net/socket.c:1716 [inline] __x64_sys_socket+0x72/0xb0 net/socket.c:1716 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7fe940479de9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe1bf080b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe940479de9 RDX: 0000000000000000 RSI: 0000000800000003 RDI: 0000000000000011 RBP: 00000000000f4240 R08: 0000000000000000 R09: 0000000100000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe1bf08110 R13: 0000000000030c67 R14: 00007ffe1bf080dc R15: 0000000000000003 </TASK> INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.067 msecs rcu: rcu_preempt kthread timer wakeup didn't happen for 10497 jiffies! g5017 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=2416 rcu: rcu_preempt kthread starved for 10498 jiffies! g5017 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:I stack:27904 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5376 [inline] __schedule+0xedb/0x5af0 kernel/sched/core.c:6688 __schedule_loop kernel/sched/core.c:6763 [inline] schedule+0xe9/0x270 kernel/sched/core.c:6778 schedule_timeout+0x137/0x290 kernel/time/timer.c:2167 rcu_gp_fqs_loop+0x1ec/0xb10 kernel/rcu/tree.c:1631 rcu_gp_kthread+0x24b/0x380 kernel/rcu/tree.c:1830 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 </TASK> --- 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@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title 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. 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
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