On 7/11/21 6:24 AM, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 3dbdb38e Merge branch 'for-5.14' of git://git.kernel.org/p.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=14cd9efbd00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=a1fcf15a09815757 > dashboard link: https://syzkaller.appspot.com/bug?extid=ba6fcd859210f4e9e109 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13bbf280300000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1111ec9c300000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+ba6fcd859210f4e9e109@xxxxxxxxxxxxxxxxxxxxxxxxx > > INFO: task syz-executor015:8439 blocked for more than 143 seconds. > Tainted: G W 5.13.0-syzkaller #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor015 state:D stack:28184 pid: 8439 ppid: 8438 flags:0x00000004 > Call Trace: > context_switch kernel/sched/core.c:4683 [inline] > __schedule+0x934/0x2710 kernel/sched/core.c:5940 > schedule+0xd3/0x270 kernel/sched/core.c:6019 > io_uring_cancel_generic+0x54d/0x890 fs/io_uring.c:9203 > io_uring_files_cancel include/linux/io_uring.h:16 [inline] > do_exit+0x28b/0x2a50 kernel/exit.c:780 > do_group_exit+0x125/0x310 kernel/exit.c:922 > __do_sys_exit_group kernel/exit.c:933 [inline] > __se_sys_exit_group kernel/exit.c:931 [inline] > __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x43eac9 > RSP: 002b:00007ffc2d1b6378 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 > RAX: ffffffffffffffda RBX: 00000000004b02f0 RCX: 000000000043eac9 > RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 > RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 00000000f0ffffff > R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004b02f0 > R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 > INFO: lockdep is turned off. > NMI backtrace for cpu 0 > CPU: 0 PID: 1650 Comm: khungtaskd Tainted: G W 5.13.0-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:79 [inline] > dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:96 > nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 > nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 > trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] > check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] > watchdog+0xd4b/0xfb0 kernel/hung_task.c:294 > kthread+0x3e5/0x4d0 kernel/kthread.c:319 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 > Sending NMI from CPU 0 to CPUs 1: > NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] > NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] > NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:109 [inline] > NMI backtrace for cpu 1 skipped: idling at acpi_idle_do_entry+0x1c6/0x250 drivers/acpi/processor_idle.c:553 #syz test: git://git.kernel.dk/linux-block io_uring-5.14 -- Jens Axboe
