On Mon, Dec 31, 2018 at 8:49 AM syzbot <syzbot+84caccb6fb5a9d11b560@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: 5f179793f0a7 Merge tag 'for_linus' of git://git.kernel.org.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=17a713d5400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=8110fb1cd164e8f > dashboard link: https://syzkaller.appspot.com/bug?extid=84caccb6fb5a9d11b560 > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11b8592b400000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+84caccb6fb5a9d11b560@xxxxxxxxxxxxxxxxxxxxxxxxx The repro matches the ones that cause stack overflow during OOMs: #syz dup: kernel panic: corrupted stack end in wb_workfn > device bridge_slave_0 left promiscuous mode > bridge0: port 1(bridge_slave_0) entered disabled state > team0 (unregistering): Port device team_slave_1 removed > team0 (unregistering): Port device team_slave_0 removed > bond0 (unregistering): Releasing backup interface bond_slave_1 > BUG: unable to handle kernel NULL pointer dereference at 00000000000000fc > PGD 1c38c3067 P4D 1c38c3067 PUD 1c38c8067 PMD 0 > Oops: 0000 [#1] PREEMPT SMP KASAN > CPU: 1 PID: 5937 Comm: rs:main Q:Reg Not tainted 4.20.0-rc5+ #146 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > RIP: 0010:qlist_free_all+0x30/0x140 mm/kasan/quarantine.c:163 > Code: 41 56 41 55 41 54 53 48 83 ec 08 48 8b 1f 48 85 db 0f 84 b0 00 00 00 > 49 89 f4 48 89 7d d0 4d 85 e4 4d 89 e7 0f 84 c7 00 00 00 <49> 63 87 fc 00 > 00 00 4c 8b 33 48 29 c3 48 83 3d 53 10 8f 07 00 49 > RSP: 0018:ffff8881b1f0ec28 EFLAGS: 00010246 > RAX: ffffea00001f5400 RBX: ffffffff87d50a40 RCX: ffffea00001f5407 > RDX: 0000000000000000 RSI: ffffffff8139dd66 RDI: 0000000000000007 > RBP: ffff8881b1f0ec58 R08: ffff8881c3bee080 R09: 0000000000000006 > R10: 0000000000000000 R11: ffff8881c3bee080 R12: 0000000000000000 > R13: ffff8881d92d7f18 R14: ffffffff87d50a40 R15: 0000000000000000 > FS: 00007f8d04ccb700(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00000000000000fc CR3: 00000001c4212000 CR4: 00000000001406e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > quarantine_reduce+0x163/0x1a0 mm/kasan/quarantine.c:259 > kasan_kmalloc+0x9b/0xe0 mm/kasan/kasan.c:538 > kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 > slab_post_alloc_hook mm/slab.h:444 [inline] > slab_alloc mm/slab.c:3392 [inline] > kmem_cache_alloc+0x11b/0x730 mm/slab.c:3552 > kmem_cache_zalloc include/linux/slab.h:731 [inline] > alloc_buffer_head+0x7c/0x1b0 fs/buffer.c:3360 > alloc_page_buffers+0x1cd/0x6b0 fs/buffer.c:829 > create_empty_buffers+0xf4/0xdb0 fs/buffer.c:1516 > ext4_block_write_begin+0x11ed/0x1870 fs/ext4/inode.c:1174 > ext4_da_write_begin+0x43b/0x12c0 fs/ext4/inode.c:3108 > generic_perform_write+0x3aa/0x6a0 mm/filemap.c:3140 > __generic_file_write_iter+0x26e/0x630 mm/filemap.c:3265 > ext4_file_write_iter+0x390/0x1420 fs/ext4/file.c:266 > call_write_iter include/linux/fs.h:1857 [inline] > new_sync_write fs/read_write.c:474 [inline] > __vfs_write+0x6b8/0x9f0 fs/read_write.c:487 > vfs_write+0x1fc/0x560 fs/read_write.c:549 > ksys_write+0x101/0x260 fs/read_write.c:598 > __do_sys_write fs/read_write.c:610 [inline] > __se_sys_write fs/read_write.c:607 [inline] > __x64_sys_write+0x73/0xb0 fs/read_write.c:607 > do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x7f8d0672919d > Code: d1 20 00 00 75 10 b8 01 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 > 83 ec 08 e8 be fa ff ff 48 89 04 24 b8 01 00 00 00 0f 05 <48> 8b 3c 24 48 > 89 c2 e8 07 fb ff ff 48 89 d0 48 83 c4 08 48 3d 01 > RSP: 002b:00007f8d04cc9f90 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 > RAX: ffffffffffffffda RBX: 0000000000000400 RCX: 00007f8d0672919d > RDX: 0000000000000400 RSI: 0000000000e8ca90 RDI: 0000000000000005 > RBP: 0000000000e8ca90 R08: 0000000000eae080 R09: 00007f8d060a7440 > R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 > R13: 00007f8d04cca410 R14: 0000000000eae080 R15: 0000000000e8c890 > Modules linked in: > CR2: 00000000000000fc > ---[ end trace ede8d46aa0374d9c ]--- > RIP: 0010:qlist_free_all+0x30/0x140 mm/kasan/quarantine.c:163 > Code: 41 56 41 55 41 54 53 48 83 ec 08 48 8b 1f 48 85 db 0f 84 b0 00 00 00 > 49 89 f4 48 89 7d d0 4d 85 e4 4d 89 e7 0f 84 c7 00 00 00 <49> 63 87 fc 00 > 00 00 4c 8b 33 48 29 c3 48 83 3d 53 10 8f 07 00 49 > kobject: 'rx-0' (0000000047bedca6): kobject_cleanup, parent 0000000004119b11 > RSP: 0018:ffff8881b1f0ec28 EFLAGS: 00010246 > kobject: 'rx-0' (0000000047bedca6): auto cleanup 'remove' event > RAX: ffffea00001f5400 RBX: ffffffff87d50a40 RCX: ffffea00001f5407 > kobject: 'rx-0' (0000000047bedca6): kobject_uevent_env > kobject: 'rx-0' (0000000047bedca6): kobject_uevent_env: uevent_suppress > caused the event to drop! > RDX: 0000000000000000 RSI: ffffffff8139dd66 RDI: 0000000000000007 > kobject: 'rx-0' (0000000047bedca6): auto cleanup kobject_del > RBP: ffff8881b1f0ec58 R08: ffff8881c3bee080 R09: 0000000000000006 > kobject: 'rx-0' (0000000047bedca6): calling ktype release > R10: 0000000000000000 R11: ffff8881c3bee080 R12: 0000000000000000 > R13: ffff8881d92d7f18 R14: ffffffff87d50a40 R15: 0000000000000000 > FS: 00007f8d04ccb700(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000 > kobject: 'rx-0': free name > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > kobject: 'tx-0' (00000000115069f4): kobject_cleanup, parent 0000000004119b11 > CR2: 00000000000000fc CR3: 00000001c4212000 CR4: 00000000001406e0 > kobject: 'tx-0' (00000000115069f4): auto cleanup 'remove' event > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > kobject: 'tx-0' (00000000115069f4): kobject_uevent_env > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > kobject: 'tx-0' (00000000115069f4): kobject_uevent_env: uevent_suppress > caused the event to drop! > kobject: 'tx-0' (00000000115069f4): auto cleanup kobject_del > > > --- > 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. > 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+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/000000000000837814057e4ca571%40google.com. > For more options, visit https://groups.google.com/d/optout.
