Messages in this thread | | | From | Dmitry Vyukov <> | Date | Thu, 5 Jul 2018 18:21:11 +0200 | Subject | Re: KASAN: stack-out-of-bounds Read in switch_mm_irqs_off |
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On Wed, Jul 4, 2018 at 5:11 PM, syzbot <syzbot+6cea61a6cd1e9ae6b195@syzkaller.appspotmail.com> wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: 2bdea157b999 Merge branch 'sctp-fully-support-for-dscp-and.. > git tree: bpf-next > console output: https://syzkaller.appspot.com/x/log.txt?x=136a7e0c400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=f62553dc846b0692 > dashboard link: https://syzkaller.appspot.com/bug?extid=6cea61a6cd1e9ae6b195 > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > > Unfortunately, I don't have any reproducer for this crash yet. > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+6cea61a6cd1e9ae6b195@syzkaller.appspotmail.com
#syz dup: KASAN: stack-out-of-bounds Read in timerqueue_add
> ================================================================== > BUG: KASAN: stack-out-of-bounds in switch_mm_irqs_off+0x13db/0x16c0 > arch/x86/mm/tlb.c:275 > PANIC: double fault, error_code: 0x0 > Read of size 8 at addr ffff8801957727f0 by task swapper/0/0 > CPU: 1 PID: 6433 Comm: syz-executor2 Not tainted 4.18.0-rc3+ #45 > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.18.0-rc3+ #45 > RIP: 0010:__lock_acquire+0x2e/0x5020 kernel/locking/lockdep.c:3294 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Code: > Call Trace: > 41 57 > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 > 41 > 89 cf > 41 56 > 41 55 > 49 89 > print_address_description+0x6c/0x20b mm/kasan/report.c:256 > fd > 41 > kasan_report_error mm/kasan/report.c:354 [inline] > kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 > 54 > __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 > 45 > switch_mm_irqs_off+0x13db/0x16c0 arch/x86/mm/tlb.c:275 > 89 cc > 53 > 65 > 4c > 8b 34 25 > 40 > ee > 01 00 > 48 > 83 > e4 f0 > context_switch kernel/sched/core.c:2850 [inline] > __schedule+0x79c/0x1ed0 kernel/sched/core.c:3504 > 48 81 > ec > 60 03 > 00 > 00 > 48 > 8b > 45 10 > <89> > schedule_idle+0x45/0x80 kernel/sched/core.c:3575 > 94 24 > do_idle+0x17f/0x570 kernel/sched/idle.c:286 > 80 > 00 > 00 > cpu_startup_entry+0x10c/0x120 kernel/sched/idle.c:368 > 00 > 48 ba > 00 > 00 > rest_init+0xe1/0xe4 init/main.c:442 > 00 00 > start_kernel+0x90e/0x949 init/main.c:738 > 00 > fc > ff df > 48 > 89 84 > 24 98 > x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:452 > x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:433 > RSP: 0018:ffff880193f7eea0 EFLAGS: 00010086 > secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:242 > RAX: 0000000000000000 RBX: 1ffff100327efe50 RCX: 0000000000000002 > > RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff88f92620 > Allocated by task 4496: > RBP: ffff880193f7f228 R08: 0000000000000000 R09: 0000000000000000 > save_stack+0x43/0xd0 mm/kasan/kasan.c:448 > R10: ffff880195aa71b8 R11: ffff8801daf236b3 R12: 0000000000000000 > set_track mm/kasan/kasan.c:460 [inline] > kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 > R13: ffffffff88f92620 R14: ffff8801aa290440 R15: 0000000000000002 > kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 > FS: 00007f39fda9b700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 > kmem_cache_alloc+0x12e/0x760 mm/slab.c:3554 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > dup_mm kernel/fork.c:1234 [inline] > copy_mm kernel/fork.c:1297 [inline] > copy_process.part.40+0x235f/0x7220 kernel/fork.c:1803 > CR2: ffff880193f7ee98 CR3: 00000001d6d6a000 CR4: 00000000001406e0 > copy_process kernel/fork.c:1616 [inline] > _do_fork+0x291/0x12a0 kernel/fork.c:2099 > DR0: 00000000200001c0 DR1: 0000000020000000 DR2: 0000000000000000 > __do_sys_clone kernel/fork.c:2206 [inline] > __se_sys_clone kernel/fork.c:2200 [inline] > __x64_sys_clone+0xbf/0x150 kernel/fork.c:2200 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 > Call Trace: > do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 > > > --- > 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@googlegroups.com. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with > syzbot. > > -- > 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@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/syzkaller-bugs/000000000000c443f505702dd6fb%40google.com. > For more options, visit https://groups.google.com/d/optout.
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