On Wed, Jul 18, 2018 at 6:29 AM, syzbot <syzbot+c9ebf7fd9683e40cc...@syzkaller.appspotmail.com> wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: dc989d2ce2c2 tools: bpftool: don't pass FEATURES_DUMP to l.. > git tree: bpf-next > console output: https://syzkaller.appspot.com/x/log.txt?x=10a9a978400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=89129667b46496c3 > dashboard link: https://syzkaller.appspot.com/bug?extid=c9ebf7fd9683e40ccebc > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=11974b2c400000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14de7a58400000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+c9ebf7fd9683e40cc...@syzkaller.appspotmail.com
#syz fix: bpf: sockhash, disallow bpf_tcp_close and update in parallel > random: sshd: uninitialized urandom read (32 bytes read) > random: sshd: uninitialized urandom read (32 bytes read) > random: sshd: uninitialized urandom read (32 bytes read) > random: sshd: uninitialized urandom read (32 bytes read) > IPVS: ftp: loaded support on port[0] = 21 > BUG: unable to handle kernel NULL pointer dereference at 0000000000000072 > ================================================================== > PGD 1acfe1067 > BUG: KASAN: stack-out-of-bounds in rcu_cblist_dequeue+0xaa/0xe0 > kernel/rcu/rcu_segcblist.c:54 > P4D 1acfe1067 > Read of size 8 at addr ffff8801cfe1e340 by task syz-executor568/12240 > PUD 1c551a067 > > PMD 0 > CPU: 0 PID: 12240 Comm: syz-executor568 Not tainted 4.18.0-rc3+ #57 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Oops: 0002 [#1] SMP KASAN > Call Trace: > CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.18.0-rc3+ #57 > <IRQ> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 > RIP: 0010:K512_4+0x6792/0x120eac > Code: > 20 > 36 > 34 > print_address_description+0x6c/0x20b mm/kasan/report.c:256 > 20 > 34 > kasan_report_error mm/kasan/report.c:354 [inline] > kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 > 20 > __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 > 74 > rcu_cblist_dequeue+0xaa/0xe0 kernel/rcu/rcu_segcblist.c:54 > 68 > 69 > rcu_do_batch kernel/rcu/tree.c:2556 [inline] > invoke_rcu_callbacks kernel/rcu/tree.c:2818 [inline] > __rcu_process_callbacks kernel/rcu/tree.c:2785 [inline] > rcu_process_callbacks+0xf7e/0x1850 kernel/rcu/tree.c:2802 > 73 > 20 > 32 > 35 > 36 > 20 > 36 > 34 > 20 > 34 > 20 > __do_softirq+0x2e8/0xb17 kernel/softirq.c:288 > 74 > 68 > 61 > 74 > 20 > 00 > 00 > 00 > 00 > 00 > invoke_softirq kernel/softirq.c:368 [inline] > irq_exit+0x1d1/0x200 kernel/softirq.c:408 > 00 > exiting_irq arch/x86/include/asm/apic.h:527 [inline] > smp_apic_timer_interrupt+0x186/0x730 arch/x86/kernel/apic/apic.c:1052 > 00 > 20 > 30 > 20 > 33 > 32 > 20 > 38 > apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863 > 20 > </IRQ> > 31 > > 32 > Allocated by task 0: > <20> > (stack is not available) > 74 > > 61 > Freed by task 3487688240: > 72 67 65 74 5f 65 6e 74 72 79 20 39 36 20 32 34 20 35 20 > RSP: 0018:ffff8801daf07980 EFLAGS: 00010202 > RAX: ffffffff81674dc6 RBX: ffffffff88bf2c08 RCX: 0000000000000000 > RDX: ffffffff88bf2c08 RSI: 0000000000000000 RDI: ffff8801cfea94a0 > RBP: ffff8801daf07c88 R08: 0000000000000000 R09: 0000000000000000 > R10: fffffbfff157bc71 R11: ffffffff8abde38b R12: ffff8801cfea94a0 > R13: ffff8801cfea94a8 R14: dffffc0000000000 R15: ffff8801daf07c60 > FS: 0000000000000000(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000000000072 CR3: 00000001cae8d000 CR4: 00000000001406e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <IRQ> > __do_softirq+0x2e8/0xb17 kernel/softirq.c:288 > invoke_softirq kernel/softirq.c:368 [inline] > irq_exit+0x1d1/0x200 kernel/softirq.c:408 > exiting_irq arch/x86/include/asm/apic.h:527 [inline] > smp_apic_timer_interrupt+0x186/0x730 arch/x86/kernel/apic/apic.c:1052 > apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863 > </IRQ> > RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54 > Code: c7 48 89 45 d8 e8 8a 2d 23 fa 48 8b 45 d8 e9 d2 fe ff ff 48 89 df e8 > 79 2d 23 fa eb 8a 90 90 90 90 90 90 90 55 48 89 e5 fb f4 <5d> c3 0f 1f 84 00 > 00 00 00 00 55 48 89 e5 f4 5d c3 90 90 90 90 90 > RSP: 0018:ffff8801d9af7c38 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 > RAX: dffffc0000000000 RBX: 1ffff1003b35ef8a RCX: ffffffff81667982 > RDX: 1ffffffff11e3610 RSI: 0000000000000004 RDI: ffffffff88f1b080 > RBP: ffff8801d9af7c38 R08: ffffed003b5e46d7 R09: ffffed003b5e46d6 > R10: ffffed003b5e46d6 R11: ffff8801daf236b3 R12: 0000000000000001 > R13: ffff8801d9af7cf0 R14: ffffffff899ee920 R15: 0000000000000000 > arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline] > default_idle+0xc7/0x450 arch/x86/kernel/process.c:500 > arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:491 > default_idle_call+0x6d/0x90 kernel/sched/idle.c:93 > cpuidle_idle_call kernel/sched/idle.c:153 [inline] > do_idle+0x3aa/0x570 kernel/sched/idle.c:262 > cpu_startup_entry+0x10c/0x120 kernel/sched/idle.c:368 > start_secondary+0x433/0x5d0 arch/x86/kernel/smpboot.c:265 > secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:242 > Modules linked in: > Dumping ftrace buffer: > (ftrace buffer empty) > CR2: 0000000000000072 > ---[ end trace 9d01a82a0b66f200 ]--- > BUG: unable to handle kernel paging request at ffffffff8c3f7968 > PGD 8e6d067 > RIP: 0010:K512_4+0x6792/0x120eac > P4D 8e6d067 > Code: > PUD 8e6e063 > 20 > PMD 0 > 36 > 34 > Thread overran stack, or stack corrupted > 20 34 > Oops: 0000 [#2] SMP KASAN > 20 > CPU: 0 PID: 12240 Comm: syz-executor568 Tainted: G D > 4.18.0-rc3+ #57 > 74 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > 68 > RIP: 0010:depot_fetch_stack+0x10/0x30 lib/stackdepot.c:201 > 69 > Code: > 73 > e8 > 20 > c5 > 32 > 2e > 35 > 47 > 36 > fe > 20 > e9 > 36 > b3 > 34 > fd > 20 > ff > 34 > ff > 20 > e8 > 74 > bb > 68 > 2e > 61 > 47 > 74 > fe > 20 > e9 > 00 > 55 > 00 > fd > 00 > ff > 00 > ff > 00 > 90 > 00 > 90 > 00 > 90 > 20 > 90 > 30 > 90 > 20 > 90 > 33 > 89 > 32 > f8 > 20 > c1 > 38 > ef > 20 > 11 > 31 > 25 > 32 > ff > <20> > ff > 74 > 1f > 61 > 00 > 72 > 81 > 67 > e7 > 65 > f0 > 74 > 3f > 5f > 00 > 65 > 00 > 6e > <48> > 74 > 03 > 72 > 3c > 79 > c5 > 20 > 60 > 39 > 39 > 36 > 43 > 20 > 8b > 32 > 8b > 34 > 47 > 20 > 0c > 35 > 48 > 20 > 83 > c7 > RSP: 0018:ffff8801daf07980 EFLAGS: 00010202 > 18 > c7 > RAX: ffffffff81674dc6 RBX: ffffffff88bf2c08 RCX: 0000000000000000 > 46 10 > RDX: ffffffff88bf2c08 RSI: 0000000000000000 RDI: ffff8801cfea94a0 > 00 > RBP: ffff8801daf07c88 R08: 0000000000000000 R09: 0000000000000000 > 00 > R10: fffffbfff157bc71 R11: ffffffff8abde38b R12: ffff8801cfea94a0 > 00 > R13: ffff8801cfea94a8 R14: dffffc0000000000 R15: ffff8801daf07c60 > 00 > FS: 0000000000000000(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > RSP: 0018:ffff8801dae07898 EFLAGS: 00010006 > CR2: 0000000000000072 CR3: 00000001cae8d000 CR4: 00000000001406e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > RAX: 00000000001f8801 RBX: ffff8801cfe1e514 RCX: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > RDX: 0000000000000000 RSI: ffff8801dae078a0 RDI: 0000000000003ff0 > > > --- > 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 syzkal...@googlegroups.com. > > 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+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/syzkaller-bugs/0000000000008e056605713e8035%40google.com. > For more options, visit https://groups.google.com/d/optout.
