On 8/29/23 10:53, syzbot wrote:
Hello, syzbot found the following issue on: HEAD commit: 727dbda16b83 Merge tag 'hardening-v6.6-rc1' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=158c0cdba80000 kernel config: https://syzkaller.appspot.com/x/.config?x=45047a5b8c295201 dashboard link: https://syzkaller.appspot.com/bug?extid=e46fbd5289363464bc13 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=14780797a80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17c1fc9fa80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/3b19428c542a/disk-727dbda1.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/45ed4d6b4633/vmlinux-727dbda1.xz kernel image: https://storage.googleapis.com/syzbot-assets/4c3abf020089/bzImage-727dbda1.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e46fbd5289363464bc13@xxxxxxxxxxxxxxxxxxxxxxxxx rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2663 jiffies s: 873 root: 0x1/. rcu: blocking rcu_node structures (internal RCU debug): Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 5177 Comm: syz-executor273 Not tainted 6.5.0-syzkaller-00453-g727dbda16b83 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline] RIP: 0010:write_comp_data+0x21/0x90 kernel/kcov.c:236 Code: 2e 0f 1f 84 00 00 00 00 00 65 8b 05 01 b2 7d 7e 49 89 f1 89 c6 49 89 d2 81 e6 00 01 00 00 49 89 f8 65 48 8b 14 25 80 b9 03 00 <a9> 00 01 ff 00 74 0e 85 f6 74 59 8b 82 04 16 00 00 85 c0 74 4f 8b RSP: 0018:ffffc90000007bb8 EFLAGS: 00000206 RAX: 0000000000000101 RBX: ffffc9000dc0d140 RCX: ffffffff885893b0 RDX: ffff88807c075940 RSI: 0000000000000100 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffc9000dc0d178 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000555555d54380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6b442f6130 CR3: 000000006fe1c000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <IRQ> pie_calculate_probability+0x480/0x850 net/sched/sch_pie.c:415 fq_pie_timer+0x1da/0x4f0 net/sched/sch_fq_pie.c:387 call_timer_fn+0x1a0/0x580 kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1751 [inline] __run_timers+0x764/0xb10 kernel/time/timer.c:2022 run_timer_softirq+0x58/0xd0 kernel/time/timer.c:2035 __do_softirq+0x218/0x965 kernel/softirq.c:553 invoke_softirq kernel/softirq.c:427 [inline] __irq_exit_rcu kernel/softirq.c:632 [inline] irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1109 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:__x64_sys_close+0x0/0xf0 fs/open.c:1557 Code: 1a 48 83 ec 80 5b 5d 41 5c c3 e8 eb bb f1 ff e9 73 ff ff ff e8 e1 bb f1 ff eb 8b e8 2a 06 4a 08 66 2e 0f 1f 84 00 00 00 00 00 <f3> 0f 1e fa 55 53 48 89 fb e8 c2 81 9d ff 48 8d 7b 70 48 b8 00 00 RSP: 0018:ffffc9000459ff38 EFLAGS: 00000206 RAX: 0000000000000003 RBX: ffffc9000459ff58 RCX: 1ffffffff1d56e59 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: ffffc9000459ff58 RBP: ffffc9000459ff48 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8eaba457 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f6b4427b290 Code: ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 80 3d f1 8d 07 00 00 74 17 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c RSP: 002b:00007ffd4ca6aa18 EFLAGS: 00000202 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00007f6b4427b290 RDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000005 RBP: 00000000000f4240 R08: 0000000055d55610 R09: 0000000055d55610 R10: 0000000000000000 R11: 0000000000000202 R12: 00000000000220c3 R13: 00007ffd4ca6aa24 R14: 00007ffd4ca6aa40 R15: 00007ffd4ca6aa30 </TASK> INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.831 msecs --- 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 bug is already fixed, 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 bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard)
#syz set subsystems: net fq_pie_timer() should not attempt to loop over up to 65536 flows, this takes up to 5 ms on ASAN builds.
If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
