audit: type=1400 audit(1598646290.047:8): avc: denied { execmem } for pid=6466 comm="syz-executor462" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 INFO: task syz-executor462:6467 blocked for more than 140 seconds. Not tainted 4.19.142-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor462 D27216 6467 6460 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0x92d/0xfe0 kernel/time/timer.c:1801 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common+0x29c/0x470 kernel/sched/completion.c:115 usb_start_wait_urb+0x14b/0x2b0 drivers/usb/core/message.c:62 usb_bulk_msg+0x226/0x550 drivers/usb/core/message.c:253 proc_bulk+0x3de/0x860 drivers/usb/core/devio.c:1206 usbdev_do_ioctl+0x696/0x3030 drivers/usb/core/devio.c:2430 usbdev_ioctl+0x21/0x30 drivers/usb/core/devio.c:2580 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x449649 Code: Bad RIP value. RSP: 002b:00007f3602614db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000006dac28 RCX: 0000000000449649 RDX: 0000000020000000 RSI: 00000000c0185502 RDI: 0000000000000003 RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac2c R13: 00007ffd438676bf R14: 00007f36026159c0 R15: 20c49ba5e353f7cf Showing all locks held in the system: 1 lock held by khungtaskd/1090: #0: 00000000686d2974 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4440 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1090 Comm: khungtaskd Not tainted 4.19.142-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2fe lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3702 Comm: systemd-journal Not tainted 4.19.142-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:__ia32_sys_getpid+0x0/0x20 kernel/sys.c:890 Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 0a 48 8b 7b 28 5b e9 42 fc ff ff e8 7d ee 5c 00 eb ef 90 66 2e 0f 1f 84 00 00 00 00 00 8b cd 26 00 31 d2 be 01 00 00 00 65 48 8b 3c 25 40 ee 01 00 e8 RSP: 0018:ffff888094397f20 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 0000000000000027 RCX: ffffffff810098b1 RDX: 1ffffffff0f008f7 RSI: ffffffff810098bf RDI: ffff888094397f58 RBP: ffff888094397f58 R08: 0000000000000000 R09: 0000000000000223 R10: 0000000000000007 R11: 0000000000000000 R12: 0000000000000100 R13: ffffffff88d25b58 R14: 0000000000000000 R15: 0000000000000000 FS: 00007ff89f1278c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff89c4d1000 CR3: 0000000094245000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7ff89e3c0f17 Code: ff ff ff 48 8b 4d a0 0f b7 51 fe 48 8b 4d a8 66 89 54 08 fe e9 1a ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 b8 27 00 00 00 0f 05 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00 RSP: 002b:00007ffcde686a38 EFLAGS: 00000206 ORIG_RAX: 0000000000000027 RAX: ffffffffffffffda RBX: 0000557b0d871200 RCX: 00007ff89e3c0f17 RDX: 0000000000000000 RSI: 00007ffcde686b50 RDI: 0000557b0d871200 RBP: 00007ffcde686b50 R08: 8950659ed57cbdeb R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000e76 R13: 00007ffcde686af8 R14: 00007ffcde686b50 R15: 00007ffcde6870e8