On Mon, Jun 4, 2018 at 7:31 AM, syzbot <syzbot+be3179e6006280aaf174@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: 325e14f97e0c Merge branch 'fixes' of git://git.kernel.org/.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=166329d7800000 > kernel config: https://syzkaller.appspot.com/x/.config?x=968b0b23c7854c0b > dashboard link: https://syzkaller.appspot.com/bug?extid=be3179e6006280aaf174 > 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+be3179e6006280aaf174@xxxxxxxxxxxxxxxxxxxxxxxxx I guess this is also: #syz fix: restore cond_resched() in shrink_dcache_parent() since this also stopped happening around 90 days ago. > watchdog: BUG: soft lockup - CPU#1 stuck for 134s! [syz-executor4:4588] > Modules linked in: > irq event stamp: 76609500 > hardirqs last enabled at (76609499): [<ffffffff81c66ccf>] > seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] > hardirqs last enabled at (76609499): [<ffffffff81c66ccf>] > read_seqcount_begin include/linux/seqlock.h:164 [inline] > hardirqs last enabled at (76609499): [<ffffffff81c66ccf>] read_seqbegin > include/linux/seqlock.h:433 [inline] > hardirqs last enabled at (76609499): [<ffffffff81c66ccf>] > read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] > hardirqs last enabled at (76609499): [<ffffffff81c66ccf>] > d_walk+0x80f/0xc80 fs/dcache.c:1248 > hardirqs last disabled at (76609500): [<ffffffff87800905>] > interrupt_entry+0xb5/0xf0 arch/x86/entry/entry_64.S:625 > softirqs last enabled at (468244): [<ffffffff87a00778>] > __do_softirq+0x778/0xaf5 kernel/softirq.c:311 > softirqs last disabled at (468177): [<ffffffff814762c1>] invoke_softirq > kernel/softirq.c:365 [inline] > softirqs last disabled at (468177): [<ffffffff814762c1>] > irq_exit+0x1d1/0x200 kernel/softirq.c:405 > CPU: 1 PID: 4588 Comm: syz-executor4 Not tainted 4.17.0-rc7+ #81 > 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:seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] > RIP: 0010:read_seqcount_begin include/linux/seqlock.h:164 [inline] > RIP: 0010:read_seqbegin include/linux/seqlock.h:433 [inline] > RIP: 0010:read_seqbegin_or_lock include/linux/seqlock.h:529 [inline] > RIP: 0010:d_walk+0x840/0xc80 fs/dcache.c:1248 > RSP: 0018:ffff880183f5f9f8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 > RAX: ffff8801b0d3c680 RBX: 0000000000000293 RCX: 1ffff100361a79e5 > RDX: 0000000000000000 RSI: ffffffff81c66cfb RDI: 0000000000000293 > RBP: ffff880183f5fb78 R08: ffff8801b0d3ceb8 R09: 0000000000000006 > R10: ffff8801b0d3c680 R11: 0000000000000000 R12: 0000000000000200 > R13: dffffc0000000000 R14: 1ffff100307ebf82 R15: ffff880183f5fb50 > FS: 000000000217c940(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007ffca8309eac CR3: 0000000183eb2000 CR4: 00000000001406e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > shrink_dcache_parent+0x179/0x230 fs/dcache.c:1486 > vfs_rmdir+0x202/0x470 fs/namei.c:3855 > do_rmdir+0x523/0x610 fs/namei.c:3916 > __do_sys_rmdir fs/namei.c:3934 [inline] > __se_sys_rmdir fs/namei.c:3932 [inline] > __x64_sys_rmdir+0x36/0x40 fs/namei.c:3932 > do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x455777 > RSP: 002b:00007ffca830a5b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000054 > RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 > RDX: 0000000000000000 RSI: 00007ffca830c360 RDI: 00007ffca830c360 > RBP: 00007ffca830c360 R08: 0000000000000000 R09: 0000000000000001 > R10: 0000000000000006 R11: 0000000000000206 R12: 000000000217d940 > R13: 0000000000000000 R14: 0000000000000198 R15: 000000000001f12d > Code: 88 48 89 f8 48 c1 e8 03 42 80 3c 28 00 0f 85 1e 04 00 00 48 83 3d 78 > 20 0b 07 00 0f 84 29 02 00 00 e8 e5 d7 b2 ff 48 89 df 57 9d <0f> 1f 44 00 00 > e8 d6 d7 b2 ff 49 8d 5f 80 48 c1 eb 03 4c 01 eb > Sending NMI from CPU 1 to CPUs 0: > NMI backtrace for cpu 0 > CPU: 0 PID: 4581 Comm: syz-executor6 Not tainted 4.17.0-rc7+ #81 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > RIP: 0010:select_collect+0x249/0x5f0 fs/dcache.c:1443 > RSP: 0018:ffff880189947908 EFLAGS: 00000286 > RAX: 0000000000000000 RBX: ffffed0031328f24 RCX: ffffffff81c5c3b4 > RDX: 0000000000000000 RSI: ffffffff81c5c4fa RDI: ffff880189947c28 > RBP: ffff8801899479e8 R08: ffff88018993e5c0 R09: ffffed0039dde7a4 > R10: ffffed0039dde7a4 R11: ffff8801ceef3d23 R12: 0000000000000000 > R13: 1ffff10031328f28 R14: ffff880189947c18 R15: dffffc0000000000 > FS: 0000000001790940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007ffebea69e9c CR3: 000000018989f000 CR4: 00000000001406f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > d_walk+0x3c3/0xc80 fs/dcache.c:1276 > shrink_dcache_parent+0x179/0x230 fs/dcache.c:1486 > vfs_rmdir+0x202/0x470 fs/namei.c:3855 > do_rmdir+0x523/0x610 fs/namei.c:3916 > __do_sys_rmdir fs/namei.c:3934 [inline] > __se_sys_rmdir fs/namei.c:3932 [inline] > __x64_sys_rmdir+0x36/0x40 fs/namei.c:3932 > do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x455777 > RSP: 002b:00007ffebea6a5a8 EFLAGS: 00000202 ORIG_RAX: 0000000000000054 > RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 0000000000455777 > RDX: 0000000000000000 RSI: 00007ffebea6c350 RDI: 00007ffebea6c350 > RBP: 00007ffebea6c350 R08: 0000000000000000 R09: 0000000000000001 > R10: 0000000000000006 R11: 0000000000000202 R12: 0000000001791940 > R13: 0000000000000000 R14: 0000000000000192 R15: 000000000001f12b > Code: 0f b6 e4 41 83 c4 01 e8 e6 7f b3 ff 48 b8 00 00 00 00 00 fc ff df 48 > 01 c3 44 89 e0 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 <c7> 43 10 00 00 > 00 00 48 81 c4 b8 00 00 00 5b 41 5c 41 5d 41 5e > > > --- > 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. > > -- > 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/00000000000043195b056dca3dad%40google.com. > For more options, visit https://groups.google.com/d/optout.
