kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 17691 Comm: syz-executor7 Not tainted 4.14.0-rc2-next-20170927+ #30 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801c17ac440 task.stack: ffff88019cf40000 RIP: 0010:__read_once_size include/linux/compiler.h:276 [inline] RIP: 0010:hrtimer_active+0x211/0x410 kernel/time/hrtimer.c:1142 RSP: 0018:ffff88019cf47738 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 1ffff100339e8f14 RCX: ffffc900022c3000 RDX: 0000000000000086 RSI: ffffffff815f7baf RDI: ffff8801ca2a6760 RBP: ffff88019cf47878 R08: ffffffff83ee1af7 R09: ffff88019cf47140 R10: ffff88019cf47be0 R11: 1ffff100382f5b1b R12: 0000000000000000 R13: 0000000000000000 R14: ffffed00339e8ef2 R15: dffffc0000000000 FS: 00007f37500cb700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000042bb00 CR3: 00000001ca782000 CR4: 00000000001426f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: hrtimer_try_to_cancel+0x91/0x5c0 kernel/time/hrtimer.c:1006 hrtimer_cancel+0x22/0x40 kernel/time/hrtimer.c:1032 napi_disable+0x87/0xa0 net/core/dev.c:5502 tun_napi_disable drivers/net/tun.c:290 [inline] __tun_detach+0xe26/0x1570 drivers/net/tun.c:617 tun_detach drivers/net/tun.c:664 [inline] tun_chr_close+0x44/0x60 drivers/net/tun.c:2829 __fput+0x333/0x7f0 fs/file_table.c:210 ____fput+0x15/0x20 fs/file_table.c:244 task_work_run+0x199/0x270 kernel/task_work.c:112 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x296/0x310 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath+0x42f/0x510 arch/x86/entry/common.c:266 entry_SYSCALL_64_fastpath+0xbc/0xbe RIP: 0033:0x4520a9 RSP: 002b:00007f37500cac08 EFLAGS: 00000216 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000718000 RCX: 00000000004520a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000017 RBP: 0000000000000460 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000216 R12: 00000000004dd792 R13: 00000000ffffffff R14: 0000000000000017 R15: 0000000000000000 Code: c6 00 00 48 8b 85 d8 fe ff ff 48 c1 e8 03 42 80 3c 38 00 0f 85 f2 01 00 00 48 8b 85 e8 fe ff ff 4c 8b 60 30 4c 89 e0 48 c1 e8 03 <42> 80 3c 38 00 0f 85 c8 01 00 00 48 8b 85 f0 fe ff ff 49 8b 1c RIP: __read_once_size include/linux/compiler.h:276 [inline] RSP: ffff88019cf47738 RIP: hrtimer_active+0x211/0x410 kernel/time/hrtimer.c:1142 RSP: ffff88019cf47738 ---[ end trace 00798396ac5a5a2e ]---