(networking cc's added) On Thu, 3 May 2018 12:14:50 +0800 kernel test robot <shun.hao@xxxxxxxxx> wrote: > Greetings, > > 0day kernel testing robot got the below dmesg and the first bad commit is > > git://git.cmpxchg.org/linux-mmotm.git master > > commit 486ad79630d0ba0b7205a8db9fe15ba392f5ee32 > Author: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > AuthorDate: Fri Apr 20 22:00:53 2018 +0000 > Commit: Johannes Weiner <hannes@xxxxxxxxxxx> > CommitDate: Fri Apr 20 22:00:53 2018 +0000 > > origin OK, this got confusing. origin.patch is the diff between 4.17-rc3 and current mainline. > > [many lines deleted] > > [main] Setsockopt(101 c 1b24000 a) on fd 177 [3:5:240] > [main] Setsockopt(1 2c 1b24000 4) on fd 178 [5:2:0] > [main] Setsockopt(29 8 1b24000 4) on fd 180 [10:1:0] > [main] Setsockopt(1 20 1b24000 4) on fd 181 [26:2:125] > [main] Setsockopt(11 1 1b24000 4) on fd 183 [2:2:17] > [ 15.532543] BUG: unable to handle kernel NULL pointer dereference at 0000000000000004 > [ 15.534143] PGD 800000001734b067 P4D 800000001734b067 PUD 17350067 PMD 0 > [ 15.535516] Oops: 0002 [#1] PTI > [ 15.536165] Modules linked in: > [ 15.536798] CPU: 0 PID: 363 Comm: trinity-main Not tainted 4.17.0-rc1-00001-g486ad79 #2 > [ 15.538396] RIP: 0010:llc_ui_release+0x3a/0xd0 > [ 15.539293] RSP: 0018:ffffc9000015bd70 EFLAGS: 00010202 > [ 15.540345] RAX: 0000000000000001 RBX: ffff88001fa60008 RCX: 0000000000000006 > [ 15.541802] RDX: 0000000000000006 RSI: ffff88001fdda660 RDI: ffff88001fa60008 > [ 15.543139] RBP: ffffc9000015bd80 R08: 0000000000000000 R09: 0000000000000000 > [ 15.544725] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 > [ 15.546287] R13: ffff88001fa61730 R14: ffff88001e130a60 R15: ffff880019bdb3f0 > [ 15.547962] FS: 00007f2221bb1700(0000) GS:ffffffff82034000(0000) knlGS:0000000000000000 > [ 15.549848] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 15.551186] CR2: 0000000000000004 CR3: 000000001734e000 CR4: 00000000000006b0 > [ 15.552671] DR0: 0000000002232000 DR1: 0000000000000000 DR2: 0000000000000000 > [ 15.554105] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 > [ 15.555534] Call Trace: > [ 15.556049] sock_release+0x14/0x60 > [ 15.556767] sock_close+0xd/0x20 > [ 15.557427] __fput+0xba/0x1f0 > [ 15.558058] ____fput+0x9/0x10 > [ 15.558682] task_work_run+0x73/0xa0 > [ 15.559416] do_exit+0x231/0xab0 > [ 15.560079] do_group_exit+0x3f/0xc0 > [ 15.560810] __x64_sys_exit_group+0x13/0x20 > [ 15.561656] do_syscall_64+0x58/0x2f0 > [ 15.562407] ? trace_hardirqs_off_thunk+0x1a/0x1c > [ 15.563360] entry_SYSCALL_64_after_hwframe+0x49/0xbe > [ 15.564471] RIP: 0033:0x7f2221696408 > [ 15.565264] RSP: 002b:00007ffe5c544c48 EFLAGS: 00000206 ORIG_RAX: 00000000000000e7 > [ 15.566924] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2221696408 > [ 15.568485] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 > [ 15.570046] RBP: 0000000000000000 R08: 00000000000000e7 R09: ffffffffffffffa0 > [ 15.571603] R10: 00007ffe5c5449e0 R11: 0000000000000206 R12: 0000000000000004 > [ 15.573160] R13: 00007ffe5c544e30 R14: 0000000000000000 R15: 0000000000000000 > [ 15.574720] Code: 7b ff 43 78 0f 88 a5 6f 14 00 31 f6 48 89 df e8 ad 33 fb ff 48 89 df e8 55 94 ff ff 85 c0 0f 84 84 00 00 00 4c 8b a3 d8 04 00 00 <41> ff 44 24 04 0f 88 7f 6f 14 00 48 8b 43 58 f6 c4 01 74 58 48 > [ 15.578679] RIP: llc_ui_release+0x3a/0xd0 RSP: ffffc9000015bd70 > [ 15.579874] CR2: 0000000000000004 > [ 15.580553] ---[ end trace 0dd8fdc6b7182234 ]--- > So it's saying that something which got committed into Linus's tree after 4.17-rc3 has caused a NULL deref in sock_release->llc_ui_release+0x3a/0xd0
