Hello, syzbot found the following issue on: HEAD commit: 4f5e5092fdbf Merge tag 'net-6.8-rc5' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12cff3a4180000 kernel config: https://syzkaller.appspot.com/x/.config?x=1d7c92dd8d5c7a1e dashboard link: https://syzkaller.appspot.com/bug?extid=269f9ad9bc32451d5fb5 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=15f4a68a180000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/d430539932db/disk-4f5e5092.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6369586e33b7/vmlinux-4f5e5092.xz kernel image: https://storage.googleapis.com/syzbot-assets/9c1e38f80254/bzImage-4f5e5092.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+269f9ad9bc32451d5fb5@xxxxxxxxxxxxxxxxxxxxxxxxx rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-...D } 2649 jiffies s: 5869 root: 0x1/. rcu: blocking rcu_node structures (internal RCU debug): Sending NMI from CPU 1 to CPUs 0: kthread+0x2ef/0x390 kernel/kthread.c:388 NMI backtrace for cpu 0 CPU: 0 PID: 5441 Comm: syz-executor.0 Not tainted 6.8.0-rc4-syzkaller-00180-g4f5e5092fdbf #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x2e/0x70 kernel/kcov.c:207 Code: 48 8b 04 24 65 48 8b 0d b0 52 70 7e 65 8b 15 b1 52 70 7e f7 c2 00 01 ff 00 74 11 f7 c2 00 01 00 00 74 35 83 b9 fc 15 00 00 00 <74> 2c 8b 91 d8 15 00 00 83 fa 02 75 21 48 8b 91 e0 15 00 00 48 8b RSP: 0018:ffffc90000006128 EFLAGS: 00000046 RAX: ffffffff8b5fbfa4 RBX: 0000000000000131 RCX: ffff88805db05940 RDX: 0000000000000103 RSI: 0000000000000131 RDI: ffffc900000061e0 RBP: ffffc90000006270 R08: ffffffff8b60127a R09: 0000000000000000 R10: ffffc900000061e0 R11: fffff52000000c3f R12: 00000000ffff0a00 R13: dffffc0000000000 R14: ffffc900000061e0 R15: ffffc900000065c1 FS: 0000555555c97480(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe746ba8008 CR3: 000000002f932000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <IRQ> put_dec+0x14/0xe0 lib/vsprintf.c:291 number+0x337/0xf90 lib/vsprintf.c:511 vsnprintf+0x1542/0x1da0 lib/vsprintf.c:2890 sprintf+0xda/0x120 lib/vsprintf.c:3028 print_time kernel/printk/printk.c:1324 [inline] info_print_prefix+0x16b/0x310 kernel/printk/printk.c:1350 record_print_text kernel/printk/printk.c:1399 [inline] printk_get_next_message+0x408/0xce0 kernel/printk/printk.c:2828 console_emit_next_record kernel/printk/printk.c:2868 [inline] console_flush_all+0x42d/0xec0 kernel/printk/printk.c:2967 console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3036 vprintk_emit+0x508/0x720 kernel/printk/printk.c:2303 _printk+0xd5/0x120 kernel/printk/printk.c:2328 printk_stack_address arch/x86/kernel/dumpstack.c:72 [inline] show_trace_log_lvl+0x438/0x520 arch/x86/kernel/dumpstack.c:285 sched_show_task+0x50c/0x6d0 kernel/sched/core.c:9171 show_state_filter+0x19e/0x270 kernel/sched/core.c:9216 kbd_keycode drivers/tty/vt/keyboard.c:1524 [inline] kbd_event+0x30fa/0x4910 drivers/tty/vt/keyboard.c:1543 input_to_handler drivers/input/input.c:132 [inline] input_pass_values+0x945/0x1200 drivers/input/input.c:161 input_event_dispose+0x402/0x650 drivers/input/input.c:389 input_handle_event+0xa71/0xbe0 drivers/input/input.c:406 input_event+0xa4/0xd0 drivers/input/input.c:435 hidinput_hid_event+0x138b/0x1c90 drivers/hid/hid-input.c:1731 hid_process_event+0x439/0x590 drivers/hid/hid-core.c:1541 hid_input_array_field+0x3fb/0x5c0 drivers/hid/hid-core.c:1653 hid_process_report drivers/hid/hid-core.c:1695 [inline] hid_report_raw_event+0xf4f/0x18a0 drivers/hid/hid-core.c:2016 hid_input_report+0x416/0x500 drivers/hid/hid-core.c:2090 hid_irq_in+0x4a0/0x6d0 drivers/hid/usbhid/hid-core.c:284 __usb_hcd_giveback_urb+0x373/0x530 drivers/usb/core/hcd.c:1650 dummy_timer+0x8aa/0x3220 drivers/usb/gadget/udc/dummy_hcd.c:1987 call_timer_fn+0x17e/0x600 kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1751 [inline] __run_timers+0x621/0x830 kernel/time/timer.c:2038 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2051 __do_softirq+0x2bb/0x942 kernel/softirq.c:553 invoke_softirq kernel/softirq.c:427 [inline] __irq_exit_rcu+0xf1/0x1c0 kernel/softirq.c:632 irq_exit_rcu+0x9/0x30 kernel/softirq.c:644 sysvec_apic_timer_interrupt+0x97/0xb0 arch/x86/kernel/apic/apic.c:1076 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:__asan_memcpy+0x3b/0x70 mm/kasan/shadow.c:106 Code: 49 89 ff 48 8b 5c 24 20 48 89 f7 48 89 d6 31 d2 48 89 d9 e8 a7 e3 ff ff 84 c0 74 2c 4c 89 ff 4c 89 e6 ba 01 00 00 00 48 89 d9 <e8> 90 e3 ff ff 84 c0 74 15 4c 89 ff 4c 89 f6 4c 89 e2 5b 41 5c 41 RSP: 0018:ffffc90004e875f8 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffffffff8b5fca58 RCX: ffffffff8b5fca58 RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffffc90004e879c8 RBP: ffffc90004e87710 R08: 0000000000000004 R09: fffffbfff1756eb8 R10: dffffc0000000000 R11: fffffbfff1756eb8 R12: 0000000000000001 R13: dffffc0000000000 R14: ffffffff8bab75c4 R15: ffffc90004e879c8 vsnprintf+0x948/0x1da0 lib/vsprintf.c:2786 sprintf+0xda/0x120 lib/vsprintf.c:3028 print_caller kernel/printk/printk.c:1335 [inline] info_print_prefix+0x204/0x310 kernel/printk/printk.c:1352 get_record_print_text_size kernel/printk/printk.c:1487 [inline] find_first_fitting_seq+0x1b2/0x580 kernel/printk/printk.c:1516 syslog_print_all+0x1ae/0x7e0 kernel/printk/printk.c:1664 do_syslog+0x38d/0x890 kernel/printk/printk.c:1742 __do_sys_syslog kernel/printk/printk.c:1820 [inline] __se_sys_syslog kernel/printk/printk.c:1818 [inline] __x64_sys_syslog+0x7c/0x90 kernel/printk/printk.c:1818 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f92d367dda9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffec8726828 EFLAGS: 00000246 ORIG_RAX: 0000000000000067 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f92d367dda9 RDX: 000000000000003f RSI: 00007ffec8726900 RDI: 0000000000000003 RBP: 00007ffec8726900 R08: 00007ffec87e60b0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffec8726ee8 R13: 00007ffec8726ee8 R14: 0000000000000001 R15: 00000000fffffff1 </TASK> ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242 </TASK> task:kworker/R-bat_e state:I stack:28848 pid:2748 tgid:2748 ppid:2 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5400 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0x149/0x260 kernel/sched/core.c:6817 rescuer_thread+0xc45/0xda0 kernel/workqueue.c:2937 kthread+0x2ef/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242 </TASK> task:kworker/u4:10 state:I stack:25808 pid:2799 tgid:2799 ppid:2 flags:0x00004000 Workqueue: 0x0 (events_unbound) Call Trace: <TASK> context_switch kernel/sched/core.c:5400 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0x149/0x260 kernel/sched/core.c:6817 worker_thread+0xc26/0x1000 kernel/workqueue.c:2802 kthread+0x2ef/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242 </TASK> task:kworker/u4:11 state:I stack:24248 pid:2829 tgid:2829 ppid:2 flags:0x00004000 Workqueue: 0x0 (events_unbound) Call Trace: <TASK> context_switch kernel/sched/core.c:5400 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0x149/0x260 kernel/sched/core.c:6817 worker_thread+0xc26/0x1000 kernel/workqueue.c:2802 kthread+0x2ef/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242 </TASK> task:kworker/u4:12 state:I stack:23024 pid:2849 tgid:2849 ppid:2 flags:0x00004000 Workqueue: 0x0 (events_unbound) Call Trace: <TASK> context_switch kernel/sched/core.c:5400 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0x149/0x260 kernel/sched/core.c:6817 worker_thread+0xc26/0x1000 kernel/workqueue.c:2802 kthread+0x2ef/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242 </TASK> task:kworker/u4:13 state:I stack:26800 pid:2888 tgid:2888 ppid:2 flags:0x00004000 Workqueue: 0x0 (events_unbound) Call Trace: <TASK> context_switch kernel/sched/core.c:5400 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0x149/0x260 kernel/sched/core.c:6817 worker_thread+0xc26/0x1000 kernel/workqueue.c:2802 kthread+0x2ef/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242 </TASK> task:kworker/u4:14 state:I stack:29392 pid:2906 tgid:2906 ppid:2 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5400 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0x149/0x260 kernel/sched/core.c:6817 worker_thread+0xc26/0x1000 kernel/workqueue.c:2802 kthread+0x2ef/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242 </TASK> task:kworker/R-zswap state:I stack:29744 pid:4464 tgid:4464 ppid:2 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5400 [inline] __schedule+0x17d1/0x49f0 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0x149/0x260 kernel/sched/core.c:6817 rescuer_thread+0xc45/0xda0 kernel/workqueue.c:2937 kthread+0x2ef/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 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@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
