syzbot


WARNING in cgroup_exit

Status: fixed on 2019/07/24 12:46
Subsystems: cgroups
[Documentation on labels]
Reported-by: syzbot+f14868630901fc6151d3@syzkaller.appspotmail.com
Fix commit: f2b31bb59824 cgroup: never call do_group_exit() with task->frozen bit set
First crash: 1807d, last: 1804d
Cause bisection: introduced by (bisect log) :
commit e42940e8559c8bbffa8286cc78067c75eb42b374
Author: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Tue May 7 01:03:30 2019 +0000

  Merge remote-tracking branch 'rdma/for-next'

Crash: WARNING: ODEBUG bug in netdev_freemem (log)
Repro: C syz .config
  
Discussions (2)
Title Replies (including bot) Last reply
BUG: soft lockup in kvm_vm_ioctl 8 (9) 2019/05/09 17:52
WARNING in cgroup_exit 1 (3) 2019/05/08 16:52

Sample crash report:
WARNING: CPU: 0 PID: 8653 at kernel/cgroup/cgroup.c:6008 cgroup_exit+0x51a/0x5d0 kernel/cgroup/cgroup.c:6008
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 8653 Comm: syz-executor076 Not tainted 5.1.0-next-20190507 #2
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+0x172/0x1f0 lib/dump_stack.c:113
 panic+0x2cb/0x75a kernel/panic.c:218
 __warn.cold+0x20/0x47 kernel/panic.c:575
 report_bug+0x263/0x2b0 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:179 [inline]
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272
 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:972
RIP: 0010:cgroup_exit+0x51a/0x5d0 kernel/cgroup/cgroup.c:6008
Code: 00 48 c7 c2 20 7f 6d 87 be d3 01 00 00 48 c7 c7 20 80 6d 87 c6 05 01 93 f1 07 01 e8 fb 03 ed ff e9 b1 fb ff ff e8 96 f9 05 00 <0f> 0b e9 75 fc ff ff e8 8a f9 05 00 48 c7 c2 e0 82 6d 87 be 85 02
RSP: 0018:ffff888086c17a80 EFLAGS: 00010093
RAX: ffff88808e99a000 RBX: 0000000000000001 RCX: ffffffff816b0b5e
RDX: 0000000000000000 RSI: ffffffff816b0eea RDI: 0000000000000001
RBP: ffff888086c17b18 R08: ffff88808e99a000 R09: ffffed1010d82f3e
R10: ffffed1010d82f3d R11: 0000000000000003 R12: ffff88808e99a000
R13: ffff8880981c3200 R14: ffff888086c17af0 R15: 1ffff11010d82f52
 do_exit+0x97a/0x2fa0 kernel/exit.c:889
 do_group_exit+0x135/0x370 kernel/exit.c:980
 get_signal+0x425/0x2270 kernel/signal.c:2638
 do_signal+0x87/0x1900 arch/x86/kernel/signal.c:815
 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:163
 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:276 [inline]
 do_syscall_64+0x57e/0x670 arch/x86/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4471e9
Code: e8 3c e6 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 ab 06 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f479f748db8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00000000006dcc38 RCX: 00000000004471e9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dcc38
RBP: 00000000006dcc30 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc3c
R13: 00007ffd1ab0c31f R14: 00007f479f7499c0 R15: 0000000000000001
Shutting down cpus with NMI
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (64):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/05/08 00:30 linux-next 00c3bc00f0ca a7383bfa .config console log report syz C ci-upstream-linux-next-kasan-gce-root
2019/05/10 03:54 linux-next 13b704419877 018207ef .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/10 01:45 linux-next 13b704419877 018207ef .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/09 23:58 linux-next 13b704419877 6fc130d3 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/09 23:52 linux-next 13b704419877 6fc130d3 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/09 22:52 linux-next 13b704419877 6fc130d3 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/09 21:06 linux-next 13b704419877 6fc130d3 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/09 19:43 linux-next 13b704419877 6fc130d3 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/09 17:36 linux-next 13b704419877 6fc130d3 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/09 16:05 linux-next 13b704419877 6fc130d3 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/09 13:58 linux-next 13b704419877 6fc130d3 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/09 09:23 linux-next 31ccad9ba503 1ab4c999 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/09 07:32 linux-next 31ccad9ba503 1ab4c999 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/09 05:43 linux-next 31ccad9ba503 1ab4c999 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/09 01:29 linux-next 31ccad9ba503 1ab4c999 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/09 00:17 linux-next 31ccad9ba503 1ab4c999 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/08 23:18 linux-next 31ccad9ba503 1ab4c999 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/08 23:15 linux-next 31ccad9ba503 1ab4c999 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/08 23:04 linux-next 31ccad9ba503 1ab4c999 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/08 22:14 linux-next 31ccad9ba503 1ab4c999 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/08 22:14 linux-next 31ccad9ba503 1ab4c999 .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/08 19:02 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/08 04:03 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/08 02:54 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 23:32 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 23:18 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 23:14 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 23:08 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 23:08 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 23:01 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 23:00 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 22:56 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 22:56 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 22:41 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 22:41 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 22:41 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 22:28 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 22:28 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 22:27 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 22:22 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 22:19 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 22:10 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 22:09 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 22:07 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 22:06 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 22:02 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 22:02 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 21:59 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 21:59 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 21:53 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 21:47 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 21:41 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
2019/05/07 21:35 linux-next 00c3bc00f0ca a7383bfa .config console log report ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.