(cc Jens ;)) On Thu, 21 Feb 2019 06:54:03 -0800 syzbot <syzbot+8e789999f280ccd69...@syzkaller.appspotmail.com> wrote:
> Hello, > > syzbot found the following crash on: > > HEAD commit: c04e2a780caf Merge tag 'fsnotify_for_v5.0-rc4' of git://gi.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=133424c0c00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=505743eba4e4f68 > dashboard link: https://syzkaller.appspot.com/bug?extid=8e789999f280ccd6930f > compiler: gcc (GCC) 9.0.0 20181231 (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+8e789999f280ccd69...@syzkaller.appspotmail.com > > kasan: GPF could be caused by NULL-ptr deref or user memory access > general protection fault: 0000 [#1] PREEMPT SMP KASAN > CPU: 1 PID: 11600 Comm: syz-executor2 Not tainted 5.0.0-rc3+ #42 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > RIP: 0010:relay_switch_subbuf+0x27a/0xad0 kernel/relay.c:753 > Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 e2 07 00 00 48 b8 00 00 00 00 > 00 fc ff df 48 8b 4b 58 48 8d 79 50 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f > 85 c9 07 00 00 48 ba 00 00 00 00 00 fc ff df 49 8b > RSP: 0018:ffff88805e3ef790 EFLAGS: 00010206 > RAX: dffffc0000000000 RBX: ffff88804bc7db40 RCX: 0000000000000000 > RDX: 000000000000000a RSI: ffffffff8182d552 RDI: 0000000000000050 > RBP: ffff88805e3ef850 R08: ffff8880637f0600 R09: fffffbfff133b0b1 > R10: ffff88805e3ef850 R11: ffffffff899d8587 R12: 0000000000000000 > R13: ffff8880a7e05e00 R14: 0000000000000000 R15: 0000000000000000 > FS: 00007f1fdbddd700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000000a50489 CR3: 00000000943a0000 CR4: 00000000001406e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > relay_flush kernel/relay.c:881 [inline] > relay_flush+0x1c4/0x280 kernel/relay.c:865 > __blk_trace_startstop.isra.0+0x28b/0x8b0 kernel/trace/blktrace.c:668 > blk_trace_ioctl+0x1c6/0x300 kernel/trace/blktrace.c:727 > blkdev_ioctl+0x141/0x2120 block/ioctl.c:591 > block_ioctl+0xee/0x130 fs/block_dev.c:1914 > vfs_ioctl fs/ioctl.c:46 [inline] > file_ioctl fs/ioctl.c:509 [inline] > do_vfs_ioctl+0x107b/0x17d0 fs/ioctl.c:696 > ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 > __do_sys_ioctl fs/ioctl.c:720 [inline] > __se_sys_ioctl fs/ioctl.c:718 [inline] > __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 > do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x458099 > Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 > 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff > ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 > RSP: 002b:00007f1fdbddcc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458099 > RDX: 0000000000000000 RSI: 0000000000001275 RDI: 0000000000000005 > RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1fdbddd6d4 > R13: 00000000004bf595 R14: 00000000004d0e88 R15: 00000000ffffffff > Modules linked in: > kobject: 'loop4' (000000005903bd4d): kobject_uevent_env > kobject: 'loop4' (000000005903bd4d): fill_kobj_path: path > = '/devices/virtual/block/loop4' > ---[ end trace d4380d594e5099d1 ]--- > RIP: 0010:relay_switch_subbuf+0x27a/0xad0 kernel/relay.c:753 > Code: 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 e2 07 00 00 48 b8 00 00 00 00 > 00 fc ff df 48 8b 4b 58 48 8d 79 50 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f > 85 c9 07 00 00 48 ba 00 00 00 00 00 fc ff df 49 8b > kobject: 'loop0' (0000000083b22ec7): kobject_uevent_env > kobject: 'loop0' (0000000083b22ec7): fill_kobj_path: path > = '/devices/virtual/block/loop0' > Unknown ioctl 19304 > kobject: 'loop3' (0000000050016e38): kobject_uevent_env > RSP: 0018:ffff88805e3ef790 EFLAGS: 00010206 > kobject: 'loop3' (0000000050016e38): fill_kobj_path: path > = '/devices/virtual/block/loop3' > RAX: dffffc0000000000 RBX: ffff88804bc7db40 RCX: 0000000000000000 > kobject: 'loop1' (000000002962ffee): kobject_uevent_env > kobject: 'loop1' (000000002962ffee): fill_kobj_path: path > = '/devices/virtual/block/loop1' > RDX: 000000000000000a RSI: ffffffff8182d552 RDI: 0000000000000050 > kobject: 'loop4' (000000005903bd4d): kobject_uevent_env > kobject: 'loop4' (000000005903bd4d): fill_kobj_path: path > = '/devices/virtual/block/loop4' > RBP: ffff88805e3ef850 R08: ffff8880637f0600 R09: fffffbfff133b0b1 > kobject: 'loop4' (000000005903bd4d): kobject_uevent_env > R10: ffff88805e3ef850 R11: ffffffff899d8587 R12: 0000000000000000 > kobject: 'loop4' (000000005903bd4d): fill_kobj_path: path > = '/devices/virtual/block/loop4' > R13: ffff8880a7e05e00 R14: 0000000000000000 R15: 0000000000000000 > FS: 00007f1fdbddd700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000000625208 CR3: 00000000943a0000 CR4: 00000000001406f0 > 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 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.
