On Mon, Nov 26, 2018 at 12:07 AM, Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote: >> > Hello, >> > >> > syzbot found the following crash on: >> > >> > HEAD commit: aea0a897af9e ptp: Fix pass zero to ERR_PTR() in ptp_clock_.. >> > git tree: net-next >> >> If you found it on net-next, I'd suggets cc'ing linux-net ... > > Uh. I meant netdev. Oops. I've filed https://github.com/google/syzkaller/issues/828 for this. Thanks. >> > console output: https://syzkaller.appspot.com/x/log.txt?x=101b91d5400000 >> > kernel config: https://syzkaller.appspot.com/x/.config?x=c36a72af2123e78a >> > dashboard link: https://syzkaller.appspot.com/bug?extid=d89b30c46434c433dbf8 >> > compiler: gcc (GCC) 8.0.1 20180413 (experimental) >> > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=170f6a47400000 >> > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12e1df7b400000 >> > >> > IMPORTANT: if you fix the bug, please add the following tag to the commit: >> > Reported-by: syzbot+d89b30c46434c433dbf8@xxxxxxxxxxxxxxxxxxxxxxxxx >> > >> > ------------[ cut here ]------------ >> > DEBUG_LOCKS_WARN_ON(!hlock->nest_lock) >> > ------------[ cut here ]------------ >> > Bad or missing usercopy whitelist? Kernel memory overwrite attempt detected >> > to SLAB object 'task_struct' (offset 1432, size 2)! >> > WARNING: CPU: 1 PID: 38 at mm/usercopy.c:83 usercopy_warn+0xee/0x110 >> > mm/usercopy.c:78 >> > Kernel panic - not syncing: panic_on_warn set ... >> > list_add corruption. next->prev should be prev (ffff8881daf2d798), but was >> > 0b7e0c8e49cc0400. (next=ffff8881d9b4a4f0). >> > CPU: 1 PID: 38 Comm: ���ف���d ������ Not tainted 4.20.0-rc3+ #312 >> > ------------[ cut here ]------------ >> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS >> > Google 01/01/2011 >> > kernel BUG at lib/list_debug.c:25! >> > ------------[ cut here ]------------ >> > invalid opcode: 0000 [#1] PREEMPT SMP KASAN >> > kernel BUG at mm/slab.c:4425! >> > CPU: 0 PID: 8652 Comm: syz-executor607 Not tainted 4.20.0-rc3+ #312 >> > WARNING: CPU: 1 PID: 38 at kernel/rcu/tree_plugin.h:438 >> > __rcu_read_unlock+0x266/0x2e0 kernel/rcu/tree_plugin.h:432 >> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS >> > Google 01/01/2011 >> > Modules linked in: >> > RIP: 0010:__list_add_valid.cold.2+0xf/0x2a lib/list_debug.c:23 >> > CPU: 1 PID: 38 Comm: ���ف���d ������ Not tainted 4.20.0-rc3+ #312 >> > Code: d1 60 88 e8 a1 37 d2 fd 0f 0b 48 89 de 48 c7 c7 60 d1 60 88 e8 90 37 >> > d2 fd 0f 0b 48 89 d9 48 c7 c7 20 d2 60 88 e8 7f 37 d2 fd <0f> 0b 48 89 f1 48 >> > c7 c7 a0 d2 60 88 48 89 de e8 6b 37 d2 fd 0f 0b >> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS >> > Google 01/01/2011 >> > RSP: 0000:ffff8881dae07588 EFLAGS: 00010082 >> > usercopy: Kernel memory overwrite attempt detected to SLAB object >> > 'signal_cache' (offset 1328, size 23)! >> > RAX: 0000000000000075 RBX: ffff8881d9b4a4f0 RCX: 0000000000000000 >> > ------------[ cut here ]------------ >> > RDX: 0000000000000000 RSI: ffffffff8165eaf5 RDI: 0000000000000005 >> > kernel BUG at mm/usercopy.c:102! >> > RBP: ffff8881dae075a0 R08: ffff8881d25ce100 R09: ffffed103b5c5020 >> > R10: ffffed103b5c5020 R11: ffff8881dae28107 R12: ffff8881bd890230 >> > R13: dffffc0000000000 R14: ffff8881dae07980 R15: ffff8881daf2d798 >> > FS: 000000000083c880(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000 >> > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> > CR2: 00007fff14476600 CR3: 00000001d2a59000 CR4: 00000000001406f0 >> > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >> > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >> > Call Trace: >> > <IRQ> >> > __list_add include/linux/list.h:60 [inline] >> > list_add include/linux/list.h:79 [inline] >> > list_move include/linux/list.h:171 [inline] >> > detach_tasks kernel/sched/fair.c:7298 [inline] >> > load_balance+0x1b8d/0x39a0 kernel/sched/fair.c:8731 >> > rebalance_domains+0x845/0xdc0 kernel/sched/fair.c:9109 >> > run_rebalance_domains+0x38d/0x500 kernel/sched/fair.c:9731 >> > __do_softirq+0x308/0xb7e kernel/softirq.c:292 >> > invoke_softirq kernel/softirq.c:373 [inline] >> > irq_exit+0x17f/0x1c0 kernel/softirq.c:413 >> > exiting_irq arch/x86/include/asm/apic.h:536 [inline] >> > smp_apic_timer_interrupt+0x1cb/0x760 arch/x86/kernel/apic/apic.c:1061 >> > apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:804 >> > </IRQ> >> > RIP: 0033:0x4005dd >> > Code: c9 00 04 00 66 0f 1f 84 00 00 00 00 00 48 8b 05 f1 2e 2d 00 48 85 c0 >> > 74 11 bf 3c e8 4b 00 b9 0e 00 00 00 48 89 c6 f3 a6 75 01 <c3> 48 89 c7 e9 9a >> > ec 01 00 66 2e 0f 1f 84 00 00 00 00 00 8b 05 4a >> > RSP: 002b:00007fff144765a8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 >> > RAX: 0000000000000000 RBX: 0000000000000002 RCX: 00000000006d2190 >> > RDX: 0000000000402410 RSI: 0000000000000000 RDI: 0000000000000000 >> > RBP: 00000000006cc0a8 R08: 0000000000000000 R09: 0000000000000000 >> > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 >> > R13: 00000000006d2180 R14: 0000000000000000 R15: 0000000000000000 >> > Modules linked in: >> > ---[ end trace eeb5734c13709e17 ]--- >> > invalid opcode: 0000 [#2] PREEMPT SMP KASAN >> > CPU: 1 PID: 38 Comm: ���ف���d ������ Tainted: G D 4.20.0-rc3+ >> > #312 >> > RIP: 0010:__list_add_valid.cold.2+0xf/0x2a lib/list_debug.c:23 >> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS >> > Google 01/01/2011 >> > Code: d1 60 88 e8 a1 37 d2 fd 0f 0b 48 89 de 48 c7 c7 60 d1 60 88 e8 90 37 >> > d2 fd 0f 0b 48 89 d9 48 c7 c7 20 d2 60 88 e8 7f 37 d2 fd <0f> 0b 48 89 f1 48 >> > c7 c7 a0 d2 60 88 48 89 de e8 6b 37 d2 fd 0f 0b >> > RIP: 0010:usercopy_abort+0xbb/0xbd mm/usercopy.c:90 >> > RSP: 0000:ffff8881dae07588 EFLAGS: 00010082 >> > Code: c0 e8 f7 dc b1 ff 48 8b 55 c0 49 89 d9 4d 89 f0 ff 75 c8 4c 89 e1 4c >> > 89 ee 48 c7 c7 80 d5 34 88 ff 75 d0 41 57 e8 e7 28 98 ff <0f> 0b e8 cc dc b1 >> > ff e8 97 13 f5 ff 8b 95 e4 fe ff ff 4c 89 e1 31 >> > RAX: 0000000000000075 RBX: ffff8881d9b4a4f0 RCX: 0000000000000000 >> > RSP: 0018:ffff8881d9b49438 EFLAGS: 00010086 >> > RDX: 0000000000000000 RSI: ffffffff8165eaf5 RDI: 0000000000000005 >> > RAX: 0000000000000068 RBX: ffffffff88291020 RCX: 0000000000000000 >> > RBP: ffff8881dae075a0 R08: ffff8881d25ce100 R09: ffffed103b5c5020 >> > RDX: 0000000000000000 RSI: ffffffff8165eaf5 RDI: 0000000000000005 >> > R10: ffffed103b5c5020 R11: ffff8881dae28107 R12: ffff8881bd890230 >> > RBP: ffff8881d9b49490 R08: ffff8881d9b4a440 R09: ffffed103b5e3ef8 >> > R13: dffffc0000000000 R14: ffff8881dae07980 R15: ffff8881daf2d798 >> > R10: ffffed103b5e3ef8 R11: ffff8881daf1f7c7 R12: ffffffff8914da1d >> > FS: 000000000083c880(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000 >> > R13: ffffffff8834d3e0 R14: ffffffff8834d320 R15: ffffffff8834d2e0 >> > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> > FS: 0000000000000000(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000 >> > CR2: 00007fff14476600 CR3: 00000001d2a59000 CR4: 00000000001406f0 >> > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >> > CR2: 0000000000000130 CR3: 00000001d7880000 CR4: 00000000001406e0 >> > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >> > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >> > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >> > Call Trace: >> > Modules linked in: >> > ---[ end trace eeb5734c13709e18 ]--- >> > RIP: 0010:__list_add_valid.cold.2+0xf/0x2a lib/list_debug.c:23 >> > Code: d1 60 88 e8 a1 37 d2 fd 0f 0b 48 89 de 48 c7 c7 60 d1 60 88 e8 90 37 >> > d2 fd 0f 0b 48 89 d9 48 c7 c7 20 d2 60 88 e8 7f 37 d2 fd <0f> 0b 48 89 f1 48 >> > c7 c7 a0 d2 60 88 48 89 de e8 6b 37 d2 fd 0f 0b >> > RSP: 0000:ffff8881dae07588 EFLAGS: 00010082 >> > RAX: 0000000000000075 RBX: ffff8881d9b4a4f0 RCX: 0000000000000000 >> > RDX: 0000000000000000 RSI: ffffffff8165eaf5 RDI: 0000000000000005 >> > RBP: ffff8881dae075a0 R08: ffff8881d25ce100 R09: ffffed103b5c5020 >> > R10: ffffed103b5c5020 R11: ffff8881dae28107 R12: ffff8881bd890230 >> > R13: dffffc0000000000 R14: ffff8881dae07980 R15: ffff8881daf2d798 >> > FS: 0000000000000000(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000 >> > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> > CR2: 0000000000000130 CR3: 00000001d7880000 CR4: 00000000001406e0 >> > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 >> > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 >> > >> > >> > --- >> > This bug is generated by a bot. It may contain errors. >> > See https://goo.gl/tpsmEJ for more information about syzbot. >> > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. >> > >> > syzbot will keep track of this bug report. See: >> > https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with >> > syzbot. >> > syzbot can test patches for this bug, for details see: >> > https://goo.gl/tpsmEJ#testing-patches >> > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/20181125230732.GE3065%40bombadil.infradead.org. > For more options, visit https://groups.google.com/d/optout.
