syzbot


general protection fault in futex_wake

Status: auto-closed as invalid on 2020/04/13 04:56
Reported-by: syzbot+e4298a993eff848ba0c4@syzkaller.appspotmail.com
First crash: 1015d, last: 1015d
similar bugs (4):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in futex_wake 1 764d 760d 0/24 auto-closed as invalid on 2020/10/20 15:46
upstream general protection fault in futex_wake (2) 2 428d 432d 0/24 auto-closed as invalid on 2021/10/21 19:26
linux-4.19 general protection fault in futex_wake 1 765d 765d 0/1 auto-closed as invalid on 2020/12/19 07:00
linux-4.19 general protection fault in futex_wake (2) 1 547d 547d 0/1 auto-closed as invalid on 2021/07/25 11:26

Sample crash report:
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 ]---

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-linux-4-14 2019/12/15 04:55 linux-4.14.y a844dc4c5442 eef6e580 .config log report
* Struck through repros no longer work on HEAD.