kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 2445 Comm: syz-executor5 Not tainted 4.19.0-rc4-next-20180920+ #76 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:reconfigure_super+0x48e/0xbb0 fs/super.c:981 Code: 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 62 05 00 00 48 ba 00 00 00 00 00 fc ff df 48 8b 03 48 8d 78 30 48 89 f9 48 c1 e9 03 <80> 3c 11 00 0f 85 4d 05 00 00 48 8b 40 30 48 85 c0 48 89 85 20 ff kobject: 'loop2' (0000000050c5219f): kobject_uevent_env RSP: 0018:ffff8801920178d8 EFLAGS: 00010206 RAX: 0000000000000000 RBX: ffff8801920179f8 RCX: 0000000000000006 RDX: dffffc0000000000 RSI: ffffffff81cdb95b RDI: 0000000000000030 RBP: ffff8801920179c8 R08: ffff880197832340 R09: fffffbfff12c24e5 R10: fffffbfff12c24e5 R11: ffffffff8961272b R12: ffff8801c68be140 kobject: 'loop2' (0000000050c5219f): fill_kobj_path: path = '/devices/virtual/block/loop2' R13: 1ffff10032402f20 R14: 0000000000000000 R15: ffff880192017adc FS: 00007f1a0f28d700(0000) GS:ffff8801dac00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000072c000 CR3: 000000019c3c8000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: do_umount_root+0x2b1/0x320 fs/namespace.c:1434 kobject: 'loop2' (0000000050c5219f): kobject_uevent_env do_umount fs/namespace.c:1504 [inline] ksys_umount+0x8b6/0x1230 fs/namespace.c:1620 kobject: 'loop2' (0000000050c5219f): fill_kobj_path: path = '/devices/virtual/block/loop2' __do_sys_umount fs/namespace.c:1631 [inline] __se_sys_umount fs/namespace.c:1629 [inline] __x64_sys_umount+0x54/0x80 fs/namespace.c:1629 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 kobject: 'loop2' (0000000050c5219f): kobject_uevent_env kobject: 'loop2' (0000000050c5219f): fill_kobj_path: path = '/devices/virtual/block/loop2' entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457679 Code: 1d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f1a0f28cc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: ffffffffffffffda RBX: 00007f1a0f28d6d4 RCX: 0000000000457679 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000080 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d81a8 R14: 00000000004c4f0c R15: 0000000000000000 Modules linked in: kobject: 'loop1' (0000000093d2a36e): kobject_uevent_env kobject: 'loop1' (0000000093d2a36e): fill_kobj_path: path = '/devices/virtual/block/loop1' kasan: CONFIG_KASAN_INLINE enabled kobject: 'loop4' (0000000019819d29): kobject_uevent_env kobject: 'loop4' (0000000019819d29): fill_kobj_path: path = '/devices/virtual/block/loop4' kasan: GPF could be caused by NULL-ptr deref or user memory access kobject: 'loop0' (000000009a201cf9): kobject_uevent_env ---[ end trace 6b0b98fa64741334 ]--- general protection fault: 0000 [#2] PREEMPT SMP KASAN kobject: 'loop0' (000000009a201cf9): fill_kobj_path: path = '/devices/virtual/block/loop0' CPU: 0 PID: 2450 Comm: syz-executor5 Tainted: G D 4.19.0-rc4-next-20180920+ #76 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:reconfigure_super+0x48e/0xbb0 fs/super.c:981 RIP: 0010:reconfigure_super+0x48e/0xbb0 fs/super.c:981 Code: 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 62 05 00 00 48 ba 00 00 00 00 00 fc ff df 48 8b 03 48 8d 78 30 48 89 f9 48 c1 e9 03 <80> 3c 11 00 0f 85 4d 05 00 00 48 8b 40 30 48 85 c0 48 89 85 20 ff RSP: 0018:ffff8801b84b78d8 EFLAGS: 00010206 RAX: 0000000000000000 RBX: ffff8801b84b79f8 RCX: 0000000000000006 RDX: dffffc0000000000 RSI: ffffffff81cdb95b RDI: 0000000000000030 kobject: 'loop3' (0000000067789f92): kobject_uevent_env RBP: ffff8801b84b79c8 R08: ffff8801ce52c380 R09: fffffbfff12c24e5 R10: fffffbfff12c24e5 R11: ffffffff8961272b R12: ffff8801c5b8eb00 R13: 1ffff10037096f20 R14: 0000000000000000 R15: ffff8801b84b7adc FS: 00007f1a0f26c700(0000) GS:ffff8801dac00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2fd23000 CR3: 000000019c3c8000 CR4: 00000000001406f0 kobject: 'loop3' (0000000067789f92): fill_kobj_path: path = '/devices/virtual/block/loop3' DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: Code: 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 62 05 00 00 48 ba 00 00 00 00 00 fc ff df 48 8b 03 48 8d 78 30 48 89 f9 48 c1 e9 03 <80> 3c 11 00 0f 85 4d 05 00 00 48 8b 40 30 48 85 c0 48 89 85 20 ff RSP: 0018:ffff8801920178d8 EFLAGS: 00010206 do_umount_root+0x2b1/0x320 fs/namespace.c:1434 do_umount fs/namespace.c:1504 [inline] ksys_umount+0x8b6/0x1230 fs/namespace.c:1620 RAX: 0000000000000000 RBX: ffff8801920179f8 RCX: 0000000000000006 RDX: dffffc0000000000 RSI: ffffffff81cdb95b RDI: 0000000000000030 RBP: ffff8801920179c8 R08: ffff880197832340 R09: fffffbfff12c24e5 R10: fffffbfff12c24e5 R11: ffffffff8961272b R12: ffff8801c68be140 R13: 1ffff10032402f20 R14: 0000000000000000 R15: ffff880192017adc __do_sys_umount fs/namespace.c:1631 [inline] __se_sys_umount fs/namespace.c:1629 [inline] __x64_sys_umount+0x54/0x80 fs/namespace.c:1629 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 FS: 00007f1a0f28d700(0000) GS:ffff8801dad00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 entry_SYSCALL_64_after_hwframe+0x49/0xbe CR2: 00000000013ebe98 CR3: 000000019c3c8000 CR4: 00000000001406e0 RIP: 0033:0x457679 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Code: 1d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f1a0f26bc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 RAX: ffffffffffffffda RBX: 00007f1a0f26c6d4 RCX: 0000000000457679 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000080 RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d81a8 R14: 00000000004c4f0c R15: 0000000000000001