syzbot


general protection fault in finish_task_switch

Status: closed as dup on 2017/12/22 08:26
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+72c44cd8b0e8a1a64b9c03c4396aea93a16465ef@syzkaller.appspotmail.com
First crash: 2291d, last: 2289d
Duplicate of
Title Repro Cause bisect Fix bisect Count Last Reported
KASAN: use-after-free Read in __schedule kvm C 145 2289d 2290d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in finish_task_switch (2) kernel C done 1538 2013d 2057d 12/26 fixed on 2019/08/23 05:31

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] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 4227 Comm: syzkaller244813 Not tainted 4.15.0-rc4-next-20171220+ #77
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__fire_sched_in_preempt_notifiers kernel/sched/core.c:2534 [inline]
RIP: 0010:fire_sched_in_preempt_notifiers kernel/sched/core.c:2540 [inline]
RIP: 0010:finish_task_switch+0x42d/0x740 kernel/sched/core.c:2670
RSP: 0018:ffff8801c284f3b8 EFLAGS: 00010a06
RAX: dffffc0000000000 RBX: ffff8801db22c900 RCX: 1bd5a00000000022
RDX: 0000000000000000 RSI: 1ffff10038509e20 RDI: dead000000000110
RBP: ffff8801c284f468 R08: 1ffff10038661af3 R09: 0000000000000000
R10: ffff8801c284f390 R11: 0000000000000000 R12: ffff8801c2eca100
R13: 1ffff10038509e7c R14: dffffc0000000000 R15: dead000000000100
FS:  00007f7f034c8700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7ee8491e78 CR3: 00000001ca6c9003 CR4: 00000000001626f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 context_switch kernel/sched/core.c:2803 [inline]
 __schedule+0x8f3/0x2060 kernel/sched/core.c:3376
 preempt_schedule_common+0x22/0x60 kernel/sched/core.c:3515
 _cond_resched+0x1d/0x30 kernel/sched/core.c:4852
 zap_pmd_range mm/memory.c:1443 [inline]
 zap_pud_range mm/memory.c:1470 [inline]
 zap_p4d_range mm/memory.c:1491 [inline]
 unmap_page_range+0x872/0x22e0 mm/memory.c:1512
 unmap_single_vma+0x15f/0x2d0 mm/memory.c:1557
 zap_page_range+0x35c/0x5f0 mm/memory.c:1611
 madvise_dontneed_single_vma mm/madvise.c:510 [inline]
 madvise_dontneed_free mm/madvise.c:563 [inline]
 madvise_vma mm/madvise.c:688 [inline]
 SYSC_madvise mm/madvise.c:863 [inline]
 SyS_madvise+0xf9e/0x13d0 mm/madvise.c:791
 entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x448fe7
RSP: 002b:00007f7f034c7dd8 EFLAGS: 00000206 ORIG_RAX: 000000000000001c
RAX: ffffffffffffffda RBX: 00007f7f034c6970 RCX: 0000000000448fe7
RDX: 0000000000000004 RSI: 00000000007fb000 RDI: 00007f7f02cc8000
RBP: 000000000000003f R08: 0000000000000012 R09: 0000000000000000
R10: 00008c0000500000 R11: 0000000000000206 R12: 0000000000000000
R13: 00000000ffffffff R14: ffffffffffffffff R15: 00000000206a2000
Code: ff 11 4c 89 f9 48 c1 e9 03 42 80 3c 31 00 0f 85 1b 02 00 00 4d 8b 3f 4d 85 ff 0f 84 c0 fd ff ff 49 8d 7f 10 48 89 f9 48 c1 e9 03 <42> 80 3c 31 00 74 ae e8 a7 cc 5b 00 eb a7 4c 89 fe 4c 89 e7 e8 
RIP: __fire_sched_in_preempt_notifiers kernel/sched/core.c:2534 [inline] RSP: ffff8801c284f3b8
RIP: fire_sched_in_preempt_notifiers kernel/sched/core.c:2540 [inline] RSP: ffff8801c284f3b8
RIP: finish_task_switch+0x42d/0x740 kernel/sched/core.c:2670 RSP: ffff8801c284f3b8
---[ end trace 4048fa81110fa823 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (266):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2017/12/20 15:13 linux-next 7dc9f647127d 90a46995 .config console log report syz C ci-upstream-next-kasan-gce
2017/12/20 14:19 linux-next 7dc9f647127d 90a46995 .config console log report syz C ci-upstream-next-kasan-gce
2017/12/22 01:03 mmots 75aa5540627f 81fe66b4 .config console log report ci-upstream-mmots-kasan-gce
2017/12/22 00:54 mmots 75aa5540627f 81fe66b4 .config console log report ci-upstream-mmots-kasan-gce
2017/12/22 00:46 mmots 75aa5540627f 81fe66b4 .config console log report ci-upstream-mmots-kasan-gce
2017/12/22 00:20 mmots 75aa5540627f 81fe66b4 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 23:57 mmots 75aa5540627f 81fe66b4 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 23:46 mmots 75aa5540627f 81fe66b4 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 23:35 mmots 75aa5540627f 81fe66b4 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 23:17 mmots 75aa5540627f 81fe66b4 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 23:16 mmots 75aa5540627f 81fe66b4 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 22:45 mmots 75aa5540627f 81fe66b4 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 22:37 mmots 75aa5540627f 81fe66b4 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 22:37 mmots 75aa5540627f 81fe66b4 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 22:21 mmots 75aa5540627f 81fe66b4 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 21:54 mmots 75aa5540627f 81fe66b4 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 21:30 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 21:21 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 21:10 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 20:53 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 20:53 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 20:52 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 20:49 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 20:41 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 20:28 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 20:28 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 20:20 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 20:19 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 19:55 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 19:48 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 19:46 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 19:33 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 19:29 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 19:26 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 19:25 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 18:54 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 18:54 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 18:52 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 18:44 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 18:40 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 18:28 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
2017/12/21 18:24 mmots 75aa5540627f eaadba98 .config console log report ci-upstream-mmots-kasan-gce
* Struck through repros no longer work on HEAD.