Hello,
syzkaller hit the following crash on
623ce3456671ea842c0ebda79c38655c8c04af74
git://
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
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:
SELinux: unrecognized netlink message: protocol=4 nlmsg_type=32
sclass=netlink_tcpdiag_socket pig=18822 comm=syz-executor4
(ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 3797 Comm: kworker/u4:5 Not tainted 4.13.0-rc4+ #24
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: events_unbound flush_to_ldisc
task: ffff8801c6abc340 task.stack: ffff8801c6a08000
RIP: 0010:__read_once_size include/linux/compiler.h:250 [inline]
RIP: 0010:n_tty_receive_buf_common+0x154/0x2520 drivers/tty/n_tty.c:1690
RSP: 0018:ffff8801c6a0f130 EFLAGS: 00010202
RAX: 000000000000044c RBX: ffff8801c8c0f680 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff8801c8c0fa28 RDI: 0000000000002260
RBP: ffff8801c6a0f2d8 R08: 0000000000000004 R09: 0000000000000005
R10: ffff8801c6a0ef68 R11: ffffffff8266dad3 R12: ffff8801c73d5b82
R13: ffff8801c73d5c82 R14: dffffc0000000000 R15: ffff8801c73d5b82
SELinux: unrecognized netlink message: protocol=4 nlmsg_type=32
sclass=netlink_tcpdiag_socket pig=18822 comm=syz-executor4
FS: 0000000000000000(0000) GS:ffff8801dc000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000000 CR3: 0000000005021000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
n_tty_receive_buf2+0x33/0x40 drivers/tty/n_tty.c:1746
tty_ldisc_receive_buf+0xa7/0x180 drivers/tty/tty_buffer.c:429
tty_port_default_receive_buf+0x106/0x160 drivers/tty/tty_port.c:37
receive_buf drivers/tty/tty_buffer.c:448 [inline]
flush_to_ldisc+0x3c4/0x590 drivers/tty/tty_buffer.c:497
process_one_work+0xbf3/0x1bc0 kernel/workqueue.c:2097
worker_thread+0x223/0x1860 kernel/workqueue.c:2231
kthread+0x35e/0x430 kernel/kthread.c:231
ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:425
Code: 89 85 18 ff ff ff 48 8d 45 98 48 89 85 e0 fe ff ff e8 71 cb 06 ff 48
8b 85 18 ff ff ff c6 00 00 48 8b 85 a0 fe ff ff 48 c1 e8 03 <42> 80 3c 30
00 0f 85 6d 1e 00 00 48 8b 85 28 ff ff ff 4c 8b a8
RIP: __read_once_size include/linux/compiler.h:250 [inline] RSP:
ffff8801c6a0f130
RIP: n_tty_receive_buf_common+0x154/0x2520 drivers/tty/n_tty.c:1690 RSP:
ffff8801c6a0f130
---[ end trace 1e2f55861d14ef37 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: disabled
---
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