Messages in this thread | | | From | Dmitry Vyukov <> | Date | Tue, 10 Apr 2018 10:56:10 +0200 | Subject | Re: WARNING: kobject bug in corrupted |
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On Tue, Apr 10, 2018 at 7:02 AM, syzbot <syzbot+dd8fe49d0d1423aa5295@syzkaller.appspotmail.com> wrote: > Hello, > > syzbot hit the following crash on upstream commit > fd40ffc72e2f74c7db61e400903e7d50a88bc0b0 (Mon Apr 9 18:36:05 2018 +0000) > selinux: fix missing dput() before selinuxfs unmount > syzbot dashboard link: > https://syzkaller.appspot.com/bug?extid=dd8fe49d0d1423aa5295 > > C reproducer: https://syzkaller.appspot.com/x/repro.c?id=5710100694040576 > syzkaller reproducer: > https://syzkaller.appspot.com/x/repro.syz?id=5951393567342592 > Raw console output: > https://syzkaller.appspot.com/x/log.txt?id=6276231339180032 > Kernel config: > https://syzkaller.appspot.com/x/.config?id=-771321277174894814 > compiler: gcc (GCC) 8.0.1 20180301 (experimental) > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+dd8fe49d0d1423aa5295@syzkaller.appspotmail.com > 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.
#syz dup: WARNING: kobject bug in sysfs_warn_dup
> Call Trace: > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0x1b9/0x294 lib/dump_stack.c:113 > kobject_add_internal failed for gfs2meta with -EEXIST, don't try to register > things with the same name in the same directory. > sysfs_warn_dup.cold.3+0x1c/0x2b fs/sysfs/dir.c:30 > sysfs_create_dir_ns+0x184/0x1d0 fs/sysfs/dir.c:58 > WARNING: CPU: 1 PID: 4473 at lib/kobject.c:238 > kobject_add_internal+0x8e0/0xba0 lib/kobject.c:236 > create_dir lib/kobject.c:69 [inline] > kobject_add_internal+0x353/0xba0 lib/kobject.c:228 > Kernel panic - not syncing: panic_on_warn set ... > > kobject_add_varg lib/kobject.c:364 [inline] > kobject_init_and_add+0xed/0x130 lib/kobject.c:435 > gfs2_sys_fs_add+0x1ff/0x500 fs/gfs2/sys.c:652 > fill_super+0x8c9/0x1a40 fs/gfs2/ops_fstype.c:1118 > gfs2_mount+0x5e6/0x712 fs/gfs2/ops_fstype.c:1321 > mount_fs+0xae/0x328 fs/super.c:1222 > vfs_kern_mount.part.34+0xd4/0x4d0 fs/namespace.c:1037 > vfs_kern_mount fs/namespace.c:1027 [inline] > do_new_mount fs/namespace.c:2517 [inline] > do_mount+0x564/0x3070 fs/namespace.c:2847 > ksys_mount+0x12d/0x140 fs/namespace.c:3063 > SYSC_mount fs/namespace.c:3077 [inline] > SyS_mount+0x35/0x50 fs/namespace.c:3074 > do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 > entry_SYSCALL_64_after_hwframe+0x42/0xb7 > RIP: 0033:0x4430ca > RSP: 002b:00007fff5f80e158 EFLAGS: 00000297 ORIG_RAX: 00000000000000a5 > RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004430ca > RDX: 0000000020000040 RSI: 0000000020000080 RDI: 00007fff5f80e170 > RBP: 00000000006cb018 R08: 00000000200004c0 R09: 000000000000000a > R10: 0000000000000000 R11: 0000000000000297 R12: 6e5f6b636f6c3d6f > R13: 746f72706b636f6c R14: 0030656c69662f2e R15: 0000000000000004 > CPU: 1 PID: 4473 Comm: syzkaller208561 Not tainted 4.16.0+ #14 > ------------[ cut here ]------------ > 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+0x1b9/0x294 lib/dump_stack.c:113 > kobject_add_internal failed for gfs2meta with -EEXIST, don't try to register > things with the same name in the same directory. > panic+0x22f/0x4de kernel/panic.c:183 > WARNING: CPU: 0 PID: 4470 at lib/kobject.c:238 > kobject_add_internal+0x8e0/0xba0 lib/kobject.c:236 > Modules linked in: > CPU: 0 PID: 4470 Comm: syzkaller208561 Not tainted 4.16.0+ #14 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > RIP: 0010:kobject_add_internal+0x8e0/0xba0 lib/kobject.c:236 > __warn.cold.8+0x163/0x1a3 kernel/panic.c:547 > RSP: 0018:ffff8801af7af480 EFLAGS: 00010286 > report_bug+0x252/0x2d0 lib/bug.c:186 > RAX: 000000000000007d RBX: ffff8801af24d1d0 RCX: ffffffff815f42ed > fixup_bug arch/x86/kernel/traps.c:178 [inline] > do_error_trap+0x1de/0x490 arch/x86/kernel/traps.c:296 > RDX: 0000000000000000 RSI: ffffffff815f8fa1 RDI: ffff8801af7aefe0 > RBP: ffff8801af7af578 R08: ffff8801af794640 R09: 0000000000000006 > R10: ffff8801af794640 R11: 0000000000000000 R12: 00000000ffffffef > R13: ffff8801d3abea48 R14: 1ffff10035ef5e9a R15: ffff8801d3abea00 > FS: 00000000011be880(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007fff0fb79330 CR3: 00000001af480000 CR4: 00000000001406f0 > do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:991 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > RIP: 0010:kobject_add_internal+0x8e0/0xba0 lib/kobject.c:236 > RSP: 0018:ffff8801af4ef480 EFLAGS: 00010286 > RAX: 000000000000007d RBX: ffff8801af2a1210 RCX: ffffffff815f42ed > RDX: 0000000000000000 RSI: ffffffff815f8fa1 RDI: ffff8801af4eefe0 > RBP: ffff8801af4ef578 R08: ffff8801af00c700 R09: 0000000000000006 > R10: ffff8801af00c700 R11: 0000000000000000 R12: 00000000ffffffef > R13: ffff8801d3abea48 R14: 1ffff10035e9de9a R15: ffff8801d3abea00 > kobject_add_varg lib/kobject.c:364 [inline] > kobject_init_and_add+0xed/0x130 lib/kobject.c:435 > gfs2_sys_fs_add+0x1ff/0x500 fs/gfs2/sys.c:652 > kobject_add_varg lib/kobject.c:364 [inline] > kobject_init_and_add+0xed/0x130 lib/kobject.c:435 > gfs2_sys_fs_add+0x1ff/0x500 fs/gfs2/sys.c:652 > fill_super+0x8c9/0x1a40 fs/gfs2/ops_fstype.c:1118 > fill_super+0x8c9/0x1a40 fs/gfs2/ops_fstype.c:1118 > gfs2_mount+0x5e6/0x712 fs/gfs2/ops_fstype.c:1321 > mount_fs+0xae/0x328 fs/super.c:1222 > vfs_kern_mount.part.34+0xd4/0x4d0 fs/namespace.c:1037 > gfs2_mount+0x5e6/0x712 fs/gfs2/ops_fstype.c:1321 > vfs_kern_mount fs/namespace.c:1027 [inline] > do_new_mount fs/namespace.c:2517 [inline] > do_mount+0x564/0x3070 fs/namespace.c:2847 > mount_fs+0xae/0x328 fs/super.c:1222 > vfs_kern_mount.part.34+0xd4/0x4d0 fs/namespace.c:1037 > vfs_kern_mount fs/namespace.c:1027 [inline] > do_new_mount fs/namespace.c:2517 [inline] > do_mount+0x564/0x3070 fs/namespace.c:2847 > ksys_mount+0x12d/0x140 fs/namespace.c:3063 > SYSC_mount fs/namespace.c:3077 [inline] > SyS_mount+0x35/0x50 fs/namespace.c:3074 > do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 > ksys_mount+0x12d/0x140 fs/namespace.c:3063 > SYSC_mount fs/namespace.c:3077 [inline] > SyS_mount+0x35/0x50 fs/namespace.c:3074 > do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 > entry_SYSCALL_64_after_hwframe+0x42/0xb7 > RIP: 0033:0x4430ca > RSP: 002b:00007fff5f80e158 EFLAGS: 00000297 ORIG_RAX: 00000000000000a5 > RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004430ca > RDX: 0000000020000040 RSI: 0000000020000080 RDI: 00007fff5f80e170 > RBP: 00000000006cb018 R08: 00000000200004c0 R09: 000000000000000a > R10: 0000000000000000 R11: 0000000000000297 R12: 6e5f6b636f6c3d6f > entry_SYSCALL_64_after_hwframe+0x42/0xb7 > R13: 746f72706b636f6c R14: 0030656c69662f2e R15: 0000000000000004 > RIP: 0033:0x4430ca > Code: > RSP: 002b:00007fff5f80e158 EFLAGS: 00000297 > 00 > ORIG_RAX: 00000000000000a5 > RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004430ca > 00 > RDX: 0000000020000040 RSI: 0000000020000080 RDI: 00007fff5f80e170 > RBP: 00000000006cb018 R08: 00000000200004c0 R09: 000000000000000a > 00 > R10: 0000000000000000 R11: 0000000000000297 R12: 6e5f6b636f6c3d6f > 00 > R13: 746f72706b636f6c R14: 0030656c69662f2e R15: 0000000000000004 > fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 88 02 00 00 48 8b 13 48 c7 c6 60 1a > 42 88 48 c7 c7 c0 17 42 88 e8 e0 62 fd f9 <0f> 0b e9 47 fb ff ff 4c 89 e7 e8 > f1 1b 6b fa e9 e2 f7 ff ff 4c > ---[ end trace 34ddd5ed728de6e7 ]--- > Dumping ftrace buffer: > (ftrace buffer empty) > Kernel Offset: disabled > Rebooting in 86400 seconds.. > > > --- > This bug is generated by a dumb bot. It may contain errors. > See https://goo.gl/tpsmEJ for details. > Direct all questions to syzkaller@googlegroups.com. > > 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 > If you want to test a patch for this bug, please reply with: > #syz test: git://repo/address.git branch > and provide the patch inline or as an attachment. > 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@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/syzkaller-bugs/00000000000047b6430569776cbc%40google.com. > For more options, visit https://groups.google.com/d/optout.
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