kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN kobject: 'loop2' (ffff8880a40e33e0): fill_kobj_path: path = '/devices/virtual/block/loop2' Modules linked in: CPU: 1 PID: 23045 Comm: syz-executor.5 Not tainted 4.14.158-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8881f8b6e3c0 task.stack: ffff8881f8b48000 RIP: 0010:futex_wake+0x20c/0x430 kernel/futex.c:1679 RSP: 0000:ffff8881f8b4f6b8 EFLAGS: 00010206 nla_parse: 4 callbacks suppressed netlink: 6 bytes leftover after parsing attributes in process `syz-executor.4'. RAX: 00000000e0e00000 RBX: 0000000706ffffe8 RCX: 0000000023386c39 RDX: 0000000000000000 RSI: ffff8881f8b6ec40 RDI: 0000000707000000 RBP: ffff8881f8b4f798 R08: 0000000000004477 R09: ffffffff89581db8 R10: ffff8881f8b6ec40 R11: ffff8881f8b6e3c0 R12: ffff888000167b58 R13: dffffc0000000000 R14: ffff8881f8b4f770 R15: ffff888000167b90 FS: 0000000000000000(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fab90946db8 CR3: 000000020a8c1000 CR4: 00000000001426e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: do_futex+0x290/0x19e0 kernel/futex.c:3907 SYSC_futex kernel/futex.c:3963 [inline] SyS_futex+0x215/0x310 kernel/futex.c:3931 mm_release+0x263/0x2e0 kernel/fork.c:1155 exit_mm_release+0x26/0x30 kernel/fork.c:1172 exit_mm kernel/exit.c:500 [inline] do_exit+0x38c/0x2c80 kernel/exit.c:841 do_group_exit+0x111/0x330 kernel/exit.c:951 get_signal+0x381/0x1cd0 kernel/signal.c:2413 do_signal+0x86/0x19a0 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x15c/0x220 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x458dd1 RSP: 002b:00007ffed596b4d0 EFLAGS: 00000293 ORIG_RAX: 0000000000000023 RAX: fffffffffffffdfc RBX: 000000000008d8ce RCX: 0000000000458dd1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffed596b4e0 RBP: 0000000000000001 R08: 00000000f3fe7653 R09: ffffffffffffffff R10: 00007ffed596b5d0 R11: 0000000000000293 R12: 000000000075bf20 R13: 000000000075c9a0 R14: 0000000000762af0 R15: 000000000075c07c Code: 46 a0 48 89 85 30 ff ff ff 0f 84 7e 01 00 00 49 bd 00 00 00 00 00 fc ff df eb 36 e8 0f 89 09 00 48 8d 7b 18 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 94 01 00 00 48 8b 43 18 49 89 dc 48 83 e8 RIP: futex_wake+0x20c/0x430 kernel/futex.c:1679 RSP: ffff8881f8b4f6b8 ---[ end trace 65eb501247cca63b ]---