WARNING in __put_task_struct

[syzbot]

Hello,

syzkaller hit the following crash on
6084b576dca2e898f5c101baef151f7bfdbb606d
git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.

Unfortunately, I don't have any reproducer for this bug yet.


binder: 9347:9349 got transaction with invalid handle, 0
WARNING: CPU: 0 PID: 9288 at kernel/fork.c:651
__put_task_struct+0x136/0x160 kernel/fork.c:651
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 9288 Comm: syz-executor3 Not tainted 4.15.0-rc3-next-20171214+
#67
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0xe9/0x14b lib/dump_stack.c:53
panic+0x10e/0x2f8 kernel/panic.c:183
__warn+0x14e/0x150 kernel/panic.c:547
report_bug+0x11e/0x1a0 lib/bug.c:184
fixup_bug.part.11+0x17/0x30 arch/x86/kernel/traps.c:177
fixup_bug arch/x86/kernel/traps.c:246 [inline]
do_error_trap+0x14a/0x180 arch/x86/kernel/traps.c:295
do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:1079
RIP: 0010:__put_task_struct+0x136/0x160 kernel/fork.c:651
RSP: 0018:ffffc90000d57e18 EFLAGS: 00010293
RAX: ffff8801dcd00140 RBX: ffff8801e1c42000 RCX: ffffffff811be336
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8801e1c42000
RBP: ffffc90000d57e30 R08: 0000000000000000 R09: 0000000000000004
R10: ffffc90000d57d68 R11: 0000000000000004 R12: ffff8801e206f000
R13: ffff8801e1c42778 R14: ffff8801e1c42048 R15: ffff8801dcd00140
put_task_struct include/linux/sched/task.h:96 [inline]
mm_update_next_owner+0x2b8/0x2c0 kernel/exit.c:486
exit_mm kernel/exit.c:543 [inline]
do_exit+0x34e/0x1050 kernel/exit.c:856
do_group_exit+0x60/0x100 kernel/exit.c:972
SYSC_exit_group kernel/exit.c:983 [inline]
SyS_exit_group+0x18/0x20 kernel/exit.c:981
entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x452a39
RSP: 002b:0000000000a6fa08 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000758248 RCX: 0000000000452a39
RDX: 0000000000000002 RSI: 00000000007615c8 RDI: 0000000000000000
RBP: 0000000000000017 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000002b R11: 0000000000000202 R12: 00000000000002fb
R13: 0000000000000003 R14: 000000000000aa50 R15: 0000000000000010
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


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[Dmitry Vyukov]

old bug bankruptcy

#syz invalid

On Mon, Dec 18, 2017 at 3:36 PM, syzbot
<bot+44ab438636d3bbd018...@syzkaller.appspotmail.com>
wrote:

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