Hello, syzbot hit the following crash on upstream commit af3e79d29555b97dd096e2f8e36a0f50213808a8 (Tue Feb 20 18:05:02 2018 +0000) Merge tag 'leds_for-4.16-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds So far this crash happened 15 times on https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/master, net-next. C reproducer is attached. syzkaller reproducer is attached. Raw console output is attached. compiler: gcc (GCC) 7.1.1 20170620 .config is attached. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+6111d5bfd5605f7520cb@syzkaller.appspotmail.com It will help syzbot understand when the bug is fixed. See footer for details. If you forward the report, please keep this part and the footer. audit: type=1400 audit(1519334784.255:7): avc: denied { map } for pid=4107 comm="syzkaller141165" path="/root/syzkaller141165324" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 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: 4107 Comm: syzkaller141165 Not tainted 4.16.0-rc2+ #324 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kernel_sock_shutdown+0x29/0x70 net/socket.c:3250 RSP: 0018:ffff8801c905fcc8 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff846006f4 RDX: 0000000000000005 RSI: 0000000000000002 RDI: 0000000000000028 RBP: ffff8801c905fce0 R08: 0000000000000000 R09: 1ffff1003920bf15 R10: ffff8801c905f870 R11: 0000000000000001 R12: ffff8801c90267d2 R13: 0000000000000002 R14: 0000000000000000 R15: ffff8801c905fd58 FS: 00000000006e6880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc70e02f000 CR3: 00000001ca694005 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: smc_shutdown+0x3ed/0x540 net/smc/af_smc.c:1268 SYSC_shutdown net/socket.c:1901 [inline] SyS_shutdown+0x137/0x290 net/socket.c:1892 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x43fcb9 RSP: 002b:00007ffde8479798 EFLAGS: 00000217 ORIG_RAX: 0000000000000030 RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fcb9 RDX: 000000000043fcb9 RSI: 0000000000000002 RDI: 0000000000000003 RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 00000000004002c8 R11: 0000000000000217 R12: 00000000004015e0 R13: 0000000000401670 R14: 0000000000000000 R15: 0000000000000000 Code: 66 90 55 48 89 e5 41 55 41 54 53 48 89 fb 41 89 f5 e8 dc 04 11 fd 48 8d 7b 28 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 32 4c 8b 63 28 48 b8 00 00 00 00 00 fc ff df 49 RIP: kernel_sock_shutdown+0x29/0x70 net/socket.c:3250 RSP: ffff8801c905fcc8 ---[ end trace 187d9b346b4a5aff ]--- Kernel panic - not syncing: Fatal exception Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds.. --- This bug is generated by a dumb bot. It may contain errors. See https://goo.gl/tpsmEJ for details. Direct all questions to syzkaller@googlegroups.com. syzbot will keep track of this bug report. If you forgot to add the Reported-by tag, once the fix for this bug is merged into any tree, please reply to this email with: #syz fix: exact-commit-title If you want to test a patch for this bug, please reply with: #syz test: git://repo/address.git branch and provide the patch inline or as an attachment. To mark this as a duplicate of another syzbot report, please reply with: #syz dup: exact-subject-of-another-report If it's a one-off invalid bug report, please reply with: #syz invalid Note: if the crash happens again, it will cause creation of a new bug report. Note: all commands must start from beginning of the line in the email body.