On Mon, Apr 23, 2018 at 10:34 AM, syzbot <syzbot+9d16ae40a3249b00a524@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > Hello, > > syzbot hit the following crash on bpf-next commit > 878a4d328104fed86ea321c48a5245eed44fbe14 (Fri Apr 20 08:05:16 2018 +0000) > libbpf: fixed build error for samples/bpf/ > syzbot dashboard link: > https://syzkaller.appspot.com/bug?extid=9d16ae40a3249b00a524 > > Unfortunately, I don't have any reproducer for this crash yet. > Raw console output: > https://syzkaller.appspot.com/x/log.txt?id=6223576852070400 > Kernel config: > https://syzkaller.appspot.com/x/.config?id=-8733987683919582507 > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+9d16ae40a3249b00a524@xxxxxxxxxxxxxxxxxxxxxxxxx > It will help syzbot understand when the bug is fixed. See footer for > details. > If you forward the report, please keep this part and the footer. This looks like: #syz dup: INFO: rcu detected stall in d_walk > random: crng init done > watchdog: BUG: soft lockup - CPU#1 stuck for 134s! [syz-executor5:4541] > Modules linked in: > irq event stamp: 61201690 > hardirqs last enabled at (61201689): [<ffffffff81c37e8f>] > seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] > hardirqs last enabled at (61201689): [<ffffffff81c37e8f>] > read_seqcount_begin include/linux/seqlock.h:164 [inline] > hardirqs last enabled at (61201689): [<ffffffff81c37e8f>] read_seqbegin > include/linux/seqlock.h:433 [inline] > hardirqs last enabled at (61201689): [<ffffffff81c37e8f>] > read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] > hardirqs last enabled at (61201689): [<ffffffff81c37e8f>] > d_walk+0x80f/0xc80 fs/dcache.c:1248 > hardirqs last disabled at (61201690): [<ffffffff87800901>] > interrupt_entry+0xb1/0xf0 arch/x86/entry/entry_64.S:624 > softirqs last enabled at (22717476): [<ffffffff87a00778>] > __do_softirq+0x778/0xaf5 kernel/softirq.c:311 > softirqs last disabled at (22717407): [<ffffffff8146fce1>] invoke_softirq > kernel/softirq.c:365 [inline] > softirqs last disabled at (22717407): [<ffffffff8146fce1>] > irq_exit+0x1d1/0x200 kernel/softirq.c:405 > CPU: 1 PID: 4541 Comm: syz-executor5 Not tainted 4.16.0+ #8 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:783 > [inline] > RIP: 0010:lock_release+0x4d4/0xa10 kernel/locking/lockdep.c:3942 > RSP: 0018:ffff88019e567880 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 > RAX: dffffc0000000000 RBX: 1ffff10033cacf15 RCX: 1ffff10033cab9dd > RDX: 1ffffffff11a30ed RSI: 0000000000000004 RDI: 0000000000000282 > RBP: ffff88019e5679b0 R08: 1ffff10033cacf19 R09: ffffed003b5e46c2 > R10: 0000000000000003 R11: 0000000000000003 R12: ffff88019e55c6c0 > R13: ffff8801a8c5a7b8 R14: ffff88019e55c6c0 R15: ffff88019e5678c8 > FS: 0000000000e6f940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000000e78978 CR3: 000000019ec29000 CR4: 00000000001406e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > __raw_spin_unlock include/linux/spinlock_api_smp.h:150 [inline] > _raw_spin_unlock+0x1a/0x30 kernel/locking/spinlock.c:176 > spin_unlock include/linux/spinlock.h:350 [inline] > d_walk+0x75f/0xc80 fs/dcache.c:1332 > shrink_dcache_parent+0x179/0x230 fs/dcache.c:1486 > vfs_rmdir+0x202/0x470 fs/namei.c:3850 > do_rmdir+0x523/0x610 fs/namei.c:3911 > SYSC_rmdir fs/namei.c:3929 [inline] > SyS_rmdir+0x1a/0x20 fs/namei.c:3927 > do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 > entry_SYSCALL_64_after_hwframe+0x42/0xb7 > RIP: 0033:0x4550e7 > RSP: 002b:00007fff59f01b28 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 > RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00000000004550e7 > RDX: 0000000000000000 RSI: 00007fff59f038d0 RDI: 00007fff59f038d0 > RBP: 00007fff59f038d0 R08: 0000000000000000 R09: 0000000000000001 > R10: 000000000000000a R11: 0000000000000206 R12: 0000000000e70940 > R13: 0000000000000000 R14: 00000000000001ca R15: 0000000000019a6a > Code: 00 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 a3 03 00 00 48 83 3d > 13 d0 75 07 00 0f 84 b8 02 00 00 48 8b bd e8 fe ff ff 57 9d <0f> 1f 44 00 00 > 48 b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 > > > --- > This bug is generated by a dumb bot. It may contain errors. > See https://goo.gl/tpsmEJ for details. > Direct all questions to syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this bug report. > If you forgot to add the Reported-by tag, once the fix for this bug is > merged > into any tree, please reply to this email with: > #syz fix: exact-commit-title > To mark this as a duplicate of another syzbot report, please reply with: > #syz dup: exact-subject-of-another-report > If it's a one-off invalid bug report, please reply with: > #syz invalid > Note: if the crash happens again, it will cause creation of a new bug > report. > Note: all commands must start from beginning of the line in the email body. > > -- > 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/00000000000068d87d056a7fe601%40google.com. > For more options, visit https://groups.google.com/d/optout.
