On Sat, 1 Oct 2022 at 15:49, syzbot <syzbot+74de79467b28a6242ae0@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: aaa11ce2ffc8 Add linux-next specific files for 20220923 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=10e00d2f080000 > kernel config: https://syzkaller.appspot.com/x/.config?x=186d1ff305f10294 > dashboard link: https://syzkaller.appspot.com/bug?extid=74de79467b28a6242ae0 > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1258b59c880000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10874800880000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/95c7bf83c07e/disk-aaa11ce2.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/b161cd56a7a3/vmlinux-aaa11ce2.xz + drivers/media/rc/imon.c maintainers, I think the culprit is this message printed infinitely: imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+74de79467b28a6242ae0@xxxxxxxxxxxxxxxxxxxxxxxxx > > rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { > 0-.... > } 2686 jiffies s: 481 root: 0x1/. > rcu: blocking rcu_node structures (internal RCU debug): > > Sending NMI from CPU 1 to CPUs 0: > imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > NMI backtrace for cpu 0 > CPU: 0 PID: 3659 Comm: udevd Not tainted 6.0.0-rc6-next-20220923-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 > RIP: 0010:io_serial_out+0x8b/0xa0 drivers/tty/serial/8250/8250_port.c:467 > Code: 48 8d 7d 40 44 89 e1 48 b8 00 00 00 00 00 fc ff df 48 89 fa d3 e3 48 c1 ea 03 80 3c 02 00 75 18 66 03 5d 40 44 89 e8 89 da ee <5b> 5d 41 5c 41 5d c3 e8 09 58 8c fd eb a4 e8 32 58 8c fd eb e1 41 > RSP: 0018:ffffc900000073b0 EFLAGS: 00000002 > RAX: 0000000000000020 RBX: 00000000000003f8 RCX: 0000000000000000 > RDX: 00000000000003f8 RSI: ffffffff843c83b1 RDI: ffffffff91379960 > RBP: ffffffff91379920 R08: 0000000000000001 R09: 000000000000001f > R10: 0000000000000000 R11: 3a30207355504353 R12: 0000000000000000 > R13: 0000000000000020 R14: ffffffff843c8350 R15: 0000000000000000 > FS: 00007f2bfe18b840(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007ffcc9ebd7b8 CR3: 0000000027f7e000 CR4: 00000000003506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <IRQ> > serial_out drivers/tty/serial/8250/8250.h:123 [inline] > serial8250_console_fifo_write drivers/tty/serial/8250/8250_port.c:3352 [inline] > serial8250_console_write+0xc22/0xf10 drivers/tty/serial/8250/8250_port.c:3423 > call_console_driver kernel/printk/printk.c:1945 [inline] > console_emit_next_record.constprop.0+0x3de/0x840 kernel/printk/printk.c:2732 > console_flush_all kernel/printk/printk.c:2794 [inline] > console_unlock+0x3be/0x600 kernel/printk/printk.c:2861 > vprintk_emit+0x1b9/0x5f0 kernel/printk/printk.c:2271 > dev_vprintk_emit+0x36e/0x3b2 drivers/base/core.c:4736 > dev_printk_emit+0xba/0xf1 drivers/base/core.c:4747 > __dev_printk+0xcf/0xf5 drivers/base/core.c:4759 > _dev_warn+0xd7/0x109 drivers/base/core.c:4803 > usb_rx_callback_intf0.cold+0x34/0x43 drivers/media/rc/imon.c:1773 > __usb_hcd_giveback_urb+0x2b0/0x5c0 drivers/usb/core/hcd.c:1671 > usb_hcd_giveback_urb+0x380/0x430 drivers/usb/core/hcd.c:1754 > dummy_timer+0x11ff/0x32c0 drivers/usb/gadget/udc/dummy_hcd.c:1988 > call_timer_fn+0x1da/0x7c0 kernel/time/timer.c:1474 > expire_timers kernel/time/timer.c:1519 [inline] > __run_timers.part.0+0x6a2/0xaf0 kernel/time/timer.c:1790 > __run_timers kernel/time/timer.c:1768 [inline] > run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803 > __do_softirq+0x1f7/0xad8 kernel/softirq.c:571 > invoke_softirq kernel/softirq.c:445 [inline] > __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 > irq_exit_rcu+0x5/0x20 kernel/softirq.c:662 > sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1107 > </IRQ> > <TASK> > asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649 > RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:58 [inline] > RIP: 0010:stack_access_ok+0x17/0x1d0 arch/x86/kernel/unwind_orc.c:347 > Code: e8 de 41 93 00 eb c4 48 89 ef e8 d4 41 93 00 eb de 66 90 48 b8 00 00 00 00 00 fc ff df 41 56 41 55 41 54 49 89 d4 48 89 fa 55 <48> c1 ea 03 48 89 f5 53 48 89 fb 48 83 ec 08 0f b6 04 02 84 c0 74 > RSP: 0018:ffffc90003f9f870 EFLAGS: 00000283 > RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000001 > RDX: ffffc90003f9f958 RSI: ffffc90003f9f9e0 RDI: ffffc90003f9f958 > RBP: ffffc90003f9f9a0 R08: ffffffff8e5e483a R09: ffffc90003f9f98c > R10: fffff520007f3f36 R11: ffffc90003f9f9e8 R12: 0000000000000008 > R13: ffffc90003f9f958 R14: ffffc90003f9f9e0 R15: ffffffff8e5e483e > deref_stack_reg arch/x86/kernel/unwind_orc.c:357 [inline] > unwind_next_frame+0x12b4/0x1cc0 arch/x86/kernel/unwind_orc.c:605 > __unwind_start+0x51b/0x800 arch/x86/kernel/unwind_orc.c:717 > unwind_start arch/x86/include/asm/unwind.h:64 [inline] > arch_stack_walk+0x5c/0xe0 arch/x86/kernel/stacktrace.c:24 > stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:122 > kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 > kasan_set_track+0x21/0x30 mm/kasan/common.c:52 > kasan_save_free_info+0x2a/0x40 mm/kasan/generic.c:511 > ____kasan_slab_free mm/kasan/common.c:236 [inline] > ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 > kasan_slab_free include/linux/kasan.h:177 [inline] > slab_free_hook mm/slub.c:1669 [inline] > slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1695 > slab_free mm/slub.c:3599 [inline] > kmem_cache_free+0xea/0x5b0 mm/slub.c:3621 > seq_release+0x5e/0x80 fs/seq_file.c:356 > kernfs_fop_release+0xf2/0x1e0 fs/kernfs/file.c:802 > __fput+0x27c/0xa90 fs/file_table.c:320 > task_work_run+0x16b/0x270 kernel/task_work.c:179 > resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] > exit_to_user_mode_loop kernel/entry/common.c:171 [inline] > exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:203 > __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] > syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:296 > do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 > entry_SYSCALL_64_after_hwframe+0x63/0xcd > RIP: 0033:0x7f2bfdd2a467 > Code: 44 00 00 48 8b 15 11 aa 0c 00 f7 d8 64 89 02 b8 ff ff ff ff eb bc 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 e1 a9 0c 00 f7 d8 64 89 02 b8 > RSP: 002b:00007ffcc9ec17a8 EFLAGS: 00000202 ORIG_RAX: 0000000000000003 > RAX: 0000000000000000 RBX: 000055c04cd1ee30 RCX: 00007f2bfdd2a467 > RDX: 00007f2bfddf1780 RSI: 0000000000000000 RDI: 0000000000000008 > RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000800000 R11: 0000000000000202 R12: 00007f2bfddf2380 > R13: 0000000000000000 R14: 0000000000000000 R15: 000055c04bcaaa7c > </TASK> > INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 4.629 msecs > imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 2-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 4-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored > imon 3-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
