Hello, syzbot found the following issue on: HEAD commit: f99c5f563c17 Merge tag 'nf-24-03-21' of git://git.kernel.o.. git tree: net console+strace: https://syzkaller.appspot.com/x/log.txt?x=12163769180000 kernel config: https://syzkaller.appspot.com/x/.config?x=6fb1be60a193d440 dashboard link: https://syzkaller.appspot.com/bug?extid=c4c6c3dc10cc96bcf723 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=125d023a180000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14a54006180000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/65d3f3eb786e/disk-f99c5f56.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/799cf7f28ff8/vmlinux-f99c5f56.xz kernel image: https://storage.googleapis.com/syzbot-assets/ab26c60c3845/bzImage-f99c5f56.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c4c6c3dc10cc96bcf723@xxxxxxxxxxxxxxxxxxxxxxxxx rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (1 ticks this GP) idle=f744/1/0x4000000000000000 softirq=6822/6822 fqs=0 rcu: (detected by 0, t=10503 jiffies, g=8373, q=658 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4736 Comm: dhcpcd Not tainted 6.8.0-syzkaller-05271-gf99c5f563c17 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:122 [inline] RIP: 0010:lock_release+0x124/0x9d0 kernel/locking/lockdep.c:5767 Code: 00 65 48 8b 04 25 80 ce 03 00 48 89 44 24 18 48 8d 98 d4 0a 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 c3 05 00 00 <83> 3b 00 0f 85 f1 04 00 00 4c 8d b4 24 b0 00 00 00 4c 89 f3 48 c1 RSP: 0018:ffffc90000a08a60 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff888018308ad4 RCX: ffffffff8171c080 RDX: 0000000000000000 RSI: ffffffff8bfec640 RDI: ffffffff8bfec600 RBP: ffffc90000a08b90 R08: ffffffff8f86ae6f R09: 1ffffffff1f0d5cd R10: dffffc0000000000 R11: fffffbfff1f0d5ce R12: 1ffff92000141158 R13: ffffffff84ac5555 R14: ffffc90000a08bc0 R15: dffffc0000000000 FS: 00007f8e49f9b740(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8e4a140b10 CR3: 0000000028508000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <IRQ> __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline] _raw_spin_unlock_irqrestore+0x79/0x140 kernel/locking/spinlock.c:194 debug_object_deactivate+0x2d5/0x390 lib/debugobjects.c:778 debug_hrtimer_deactivate kernel/time/hrtimer.c:428 [inline] debug_deactivate+0x1b/0x200 kernel/time/hrtimer.c:484 __run_hrtimer kernel/time/hrtimer.c:1660 [inline] __hrtimer_run_queues+0x30f/0xd00 kernel/time/hrtimer.c:1756 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1818 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x107/0x3a0 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1043 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:check_kcov_mode kernel/kcov.c:184 [inline] RIP: 0010:write_comp_data kernel/kcov.c:236 [inline] RIP: 0010:__sanitizer_cov_trace_cmp8+0x35/0x90 kernel/kcov.c:284 Code: 0c 25 80 ce 03 00 65 8b 05 a0 db 6e 7e a9 00 01 ff 00 74 10 a9 00 01 00 00 74 57 83 b9 14 16 00 00 00 74 4e 8b 81 f0 15 00 00 <83> f8 03 75 43 48 8b 91 f8 15 00 00 44 8b 89 f4 15 00 00 49 c1 e1 RSP: 0018:ffffc900035ff500 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffffff81000000 RCX: ffff888018308000 RDX: ffffc900035ff615 RSI: ffffffff81000000 RDI: ffffffff81ecc4e1 RBP: ffffffff81ecc4e1 R08: ffffffff81409149 R09: ffffc900035ff6d0 R10: 0000000000000003 R11: ffffffff8180dbc0 R12: ffffc900035ff5e0 R13: ffffc900035ff630 R14: dffffc0000000000 R15: ffffffff81ecc4e2 orc_find arch/x86/kernel/unwind_orc.c:206 [inline] unwind_next_frame+0x1d9/0x2a00 arch/x86/kernel/unwind_orc.c:494 arch_stack_walk+0x151/0x1b0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3813 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmem_cache_alloc_node+0x192/0x380 mm/slub.c:3903 alloc_task_struct_node kernel/fork.c:176 [inline] dup_task_struct+0x57/0x7d0 kernel/fork.c:1106 copy_process+0x5d1/0x3df0 kernel/fork.c:2219 kernel_clone+0x21e/0x8d0 kernel/fork.c:2796 __do_sys_clone kernel/fork.c:2939 [inline] __se_sys_clone kernel/fork.c:2923 [inline] __x64_sys_clone+0x258/0x2a0 kernel/fork.c:2923 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7f8e4a04ba12 Code: 41 5d 41 5e 41 5f c3 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 10 48 8b 15 e7 43 0f 00 f7 d8 64 89 02 48 83 RSP: 002b:00007fff3d31e228 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00005624b41b1601 RCX: 00007f8e4a04ba12 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007fff3d33e798 R08: 0000000000000000 R09: 00005624b41b15d0 R10: 00007f8e49f9ba10 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 00005624b41b1604 </TASK> rcu: rcu_preempt kthread timer wakeup didn't happen for 10502 jiffies! g8373 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=1 timer-softirq=4283 rcu: rcu_preempt kthread starved for 10503 jiffies! g8373 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 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:24656 pid:16 tgid:16 ppid:2 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5409 [inline] __schedule+0x17d3/0x4a20 kernel/sched/core.c:6736 __schedule_loop kernel/sched/core.c:6813 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6828 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2572 rcu_gp_fqs_loop+0x2df/0x1370 kernel/rcu/tree.c:1663 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:1862 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 </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@xxxxxxxxxxxxxxxx. 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 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
