On Thu, Aug 16, 2018 at 5:26 PM syzbot <syzbot+c441f41d7e2f04ef32d2@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: 31130a16d459 Merge tag 'for-linus-4.19-rc1-tag' of git://g.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=16676be2400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=e8d52931cda051de > dashboard link: https://syzkaller.appspot.com/bug?extid=c441f41d7e2f04ef32d2 > 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+c441f41d7e2f04ef32d2@xxxxxxxxxxxxxxxxxxxxxxxxx > > RDX: 0000000020000380 RSI: 0000000020000c80 RDI: 0000000000000000 > RBP: 00000000009300a0 R08: 0000000020000cc0 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006 > R13: 00000000004d2768 R14: 00000000004c7be5 R15: 000000000000001f > ================================================================== > BUG: KASAN: double-free or invalid-free in fscache_free_cookie+0x230/0x280 > fs/fscache/cookie.c:67 This seems to have been fixed by something (in 9p?). Last happened 4 months ago. Candidate for closure as obsolete. > CPU: 0 PID: 19158 Comm: syz-executor4 Not tainted 4.18.0+ #190 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 > print_address_description+0x6c/0x20b mm/kasan/report.c:256 > kasan_report_invalid_free+0x64/0xa0 mm/kasan/report.c:336 > __kasan_slab_free+0x150/0x170 mm/kasan/kasan.c:501 > kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 > __cache_free mm/slab.c:3498 [inline] > kfree+0xd9/0x260 mm/slab.c:3813 > fscache_free_cookie+0x230/0x280 fs/fscache/cookie.c:67 > fscache_alloc_cookie+0x74c/0x880 fs/fscache/cookie.c:202 > __fscache_acquire_cookie+0x230/0xb00 fs/fscache/cookie.c:303 > fscache_acquire_cookie include/linux/fscache.h:338 [inline] > v9fs_cache_session_get_cookie+0xc4/0x270 fs/9p/cache.c:73 > v9fs_session_init+0x1013/0x1a80 fs/9p/v9fs.c:464 > v9fs_mount+0x7c/0x900 fs/9p/vfs_super.c:135 > mount_fs+0xae/0x328 fs/super.c:1277 > vfs_kern_mount.part.34+0xdc/0x4e0 fs/namespace.c:1046 > vfs_kern_mount fs/namespace.c:1036 [inline] > do_new_mount fs/namespace.c:2542 [inline] > do_mount+0x581/0x30e0 fs/namespace.c:2872 > ksys_mount+0x12d/0x140 fs/namespace.c:3088 > __do_sys_mount fs/namespace.c:3102 [inline] > __se_sys_mount fs/namespace.c:3099 [inline] > __x64_sys_mount+0xbe/0x150 fs/namespace.c:3099 > do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x457089 > Code: fd b4 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 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 > RSP: 002b:00007f7c72566c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 > RAX: ffffffffffffffda RBX: 00007f7c725676d4 RCX: 0000000000457089 > RDX: 0000000020000380 RSI: 0000000020000c80 RDI: 0000000000000000 > RBP: 00000000009300a0 R08: 0000000020000cc0 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000006 > R13: 00000000004d2768 R14: 00000000004c7be5 R15: 000000000000001f > > Allocated by task 17919: > save_stack+0x43/0xd0 mm/kasan/kasan.c:448 > set_track mm/kasan/kasan.c:460 [inline] > kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 > __do_kmalloc mm/slab.c:3718 [inline] > __kmalloc+0x14e/0x760 mm/slab.c:3727 > kmalloc include/linux/slab.h:518 [inline] > kzalloc include/linux/slab.h:707 [inline] > fscache_set_key fs/fscache/cookie.c:101 [inline] > fscache_alloc_cookie+0x701/0x880 fs/fscache/cookie.c:171 > __fscache_acquire_cookie+0x230/0xb00 fs/fscache/cookie.c:303 > fscache_acquire_cookie include/linux/fscache.h:338 [inline] > v9fs_cache_session_get_cookie+0xc4/0x270 fs/9p/cache.c:73 > v9fs_session_init+0x1013/0x1a80 fs/9p/v9fs.c:464 > v9fs_mount+0x7c/0x900 fs/9p/vfs_super.c:135 > mount_fs+0xae/0x328 fs/super.c:1277 > vfs_kern_mount.part.34+0xdc/0x4e0 fs/namespace.c:1046 > vfs_kern_mount fs/namespace.c:1036 [inline] > do_new_mount fs/namespace.c:2542 [inline] > do_mount+0x581/0x30e0 fs/namespace.c:2872 > ksys_mount+0x12d/0x140 fs/namespace.c:3088 > __do_sys_mount fs/namespace.c:3102 [inline] > __se_sys_mount fs/namespace.c:3099 [inline] > __x64_sys_mount+0xbe/0x150 fs/namespace.c:3099 > do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > > Freed by task 17919: > save_stack+0x43/0xd0 mm/kasan/kasan.c:448 > set_track mm/kasan/kasan.c:460 [inline] > __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 > kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 > __cache_free mm/slab.c:3498 [inline] > kfree+0xd9/0x260 mm/slab.c:3813 > fscache_free_cookie+0x230/0x280 fs/fscache/cookie.c:67 > fscache_cookie_put+0x39d/0x850 fs/fscache/cookie.c:889 > __fscache_relinquish_cookie+0x494/0x911 fs/fscache/cookie.c:846 > fscache_relinquish_cookie include/linux/fscache.h:367 [inline] > v9fs_cache_session_put_cookie+0x46/0x90 fs/9p/cache.c:87 > v9fs_session_close+0xf4/0x420 fs/9p/v9fs.c:498 > v9fs_kill_super+0x4e/0xa0 fs/9p/vfs_super.c:233 > deactivate_locked_super+0x97/0x100 fs/super.c:326 > v9fs_mount+0x461/0x900 fs/9p/vfs_super.c:214 > mount_fs+0xae/0x328 fs/super.c:1277 > vfs_kern_mount.part.34+0xdc/0x4e0 fs/namespace.c:1046 > vfs_kern_mount fs/namespace.c:1036 [inline] > do_new_mount fs/namespace.c:2542 [inline] > do_mount+0x581/0x30e0 fs/namespace.c:2872 > ksys_mount+0x12d/0x140 fs/namespace.c:3088 > __do_sys_mount fs/namespace.c:3102 [inline] > __se_sys_mount fs/namespace.c:3099 [inline] > __x64_sys_mount+0xbe/0x150 fs/namespace.c:3099 > do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > > The buggy address belongs to the object at ffff8801d8a4a000 > which belongs to the cache kmalloc-64 of size 64 > The buggy address is located 0 bytes inside of > 64-byte region [ffff8801d8a4a000, ffff8801d8a4a040) > The buggy address belongs to the page: > page:ffffea0007629280 count:1 mapcount:0 mapping:ffff8801dac00340 index:0x0 > flags: 0x2fffc0000000100(slab) > raw: 02fffc0000000100 ffffea0007234b88 ffffea00072fb488 ffff8801dac00340 > raw: 0000000000000000 ffff8801d8a4a000 0000000100000020 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff8801d8a49f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > ffff8801d8a49f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > > ffff8801d8a4a000: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc > ^ > ffff8801d8a4a080: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc > ffff8801d8a4a100: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc > ================================================================== > > > --- > 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/000000000000a22cb205738f0f76%40google.com. > For more options, visit https://groups.google.com/d/optout. -- Linux-cachefs mailing list Linux-cachefs@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cachefs
