Messages in this thread | | | From | Dmitry Vyukov <> | Date | Wed, 11 Apr 2018 17:00:35 +0200 | Subject | Re: WARNING: kobject bug in sysfs_warn_dup |
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On Thu, Apr 5, 2018 at 4:02 AM, syzbot <syzbot+ff87a28e665c163aa7f5@syzkaller.appspotmail.com> wrote: > Hello, > > syzbot hit the following crash on upstream commit > 3e968c9f1401088abc9a19ae6ff571644d37a355 (Wed Apr 4 21:19:24 2018 +0000) > Merge tag 'ext4_for_linus' of > git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 > syzbot dashboard link: > https://syzkaller.appspot.com/bug?extid=ff87a28e665c163aa7f5 > > C reproducer: https://syzkaller.appspot.com/x/repro.c?id=5104666266304512 > syzkaller reproducer: > https://syzkaller.appspot.com/x/repro.syz?id=5683447737614336 > Raw console output: > https://syzkaller.appspot.com/x/log.txt?id=5104818200772608 > Kernel config: > https://syzkaller.appspot.com/x/.config?id=9118669095563550941 > compiler: gcc (GCC) 7.1.1 20170620 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+ff87a28e665c163aa7f5@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 gfs2_sys_fs_add
> R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000000003 > R13: 0000000000000004 R14: 0000000000000000 R15: 0000000000000000 > ------------[ cut here ]------------ > kobject_add_internal failed for nodev( with -EEXIST, don't try to register > things with the same name in the same directory. > sysfs: cannot create duplicate filename '/fs/gfs2/nodev(' > WARNING: CPU: 1 PID: 4473 at lib/kobject.c:238 > kobject_add_internal+0x8d4/0xbc0 lib/kobject.c:235 > CPU: 0 PID: 4474 Comm: syzkaller533472 Not tainted 4.16.0+ #15 > Kernel panic - not syncing: panic_on_warn set ... > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:17 [inline] > dump_stack+0x1a7/0x27d lib/dump_stack.c:53 > sysfs_warn_dup+0x83/0xa0 fs/sysfs/dir.c:30 > sysfs_create_dir_ns+0x178/0x1d0 fs/sysfs/dir.c:58 > create_dir lib/kobject.c:69 [inline] > kobject_add_internal+0x335/0xbc0 lib/kobject.c:227 > kobject_add_varg lib/kobject.c:364 [inline] > kobject_init_and_add+0xf9/0x150 lib/kobject.c:436 > gfs2_sys_fs_add+0x1ff/0x580 fs/gfs2/sys.c:652 > fill_super+0x86f/0x1d70 fs/gfs2/ops_fstype.c:1118 > gfs2_mount+0x587/0x6e0 fs/gfs2/ops_fstype.c:1321 > mount_fs+0x66/0x2d0 fs/super.c:1222 > vfs_kern_mount.part.26+0xc6/0x4a0 fs/namespace.c:1037 > vfs_kern_mount fs/namespace.c:2514 [inline] > do_new_mount fs/namespace.c:2517 [inline] > do_mount+0xea4/0x2b90 fs/namespace.c:2847 > ksys_mount+0xab/0x120 fs/namespace.c:3063 > SYSC_mount fs/namespace.c:3077 [inline] > SyS_mount+0x39/0x50 fs/namespace.c:3074 > do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 > entry_SYSCALL_64_after_hwframe+0x42/0xb7 > RIP: 0033:0x4432fa > RSP: 002b:00007ffda3d84538 EFLAGS: 00000286 ORIG_RAX: 00000000000000a5 > RAX: ffffffffffffffda RBX: 0000000020001a40 RCX: 00000000004432fa > RDX: 0000000020001a00 RSI: 0000000020001a40 RDI: 00007ffda3d84550 > RBP: 0000000000000000 R08: 0000000020001f00 R09: 000000000000000a > R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000000003 > R13: 0000000000000004 R14: 0000000000000000 R15: 0000000000000000 > CPU: 1 PID: 4473 Comm: syzkaller533472 Not tainted 4.16.0+ #15 > ------------[ cut here ]------------ > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:17 [inline] > dump_stack+0x1a7/0x27d lib/dump_stack.c:53 > kobject_add_internal failed for nodev( with -EEXIST, don't try to register > things with the same name in the same directory. > panic+0x1f8/0x42c kernel/panic.c:183 > WARNING: CPU: 0 PID: 4474 at lib/kobject.c:238 > kobject_add_internal+0x8d4/0xbc0 lib/kobject.c:235 > Modules linked in: > __warn+0x1dc/0x200 kernel/panic.c:547 > CPU: 0 PID: 4474 Comm: syzkaller533472 Not tainted 4.16.0+ #15 > report_bug+0x1f4/0x2b0 lib/bug.c:186 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > fixup_bug.part.10+0x37/0x80 arch/x86/kernel/traps.c:178 > RIP: 0010:kobject_add_internal+0x8d4/0xbc0 lib/kobject.c:235 > fixup_bug arch/x86/kernel/traps.c:247 [inline] > do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296 > RSP: 0000:ffff8801addaf470 EFLAGS: 00010282 > RAX: dffffc0000000008 RBX: ffff8801d9661110 RCX: ffffffff815b5d2e > RDX: 0000000000000000 RSI: 1ffff10035bb5e3e RDI: 1ffff10035bb5e13 > RBP: ffff8801addaf568 R08: 1ffff10035bb5dd5 R09: 0000000000000001 > R10: 0000000000000001 R11: 0000000000000000 R12: 1ffff10035bb5e94 > R13: 00000000ffffffef R14: ffff8801d39ae348 R15: 1ffff10035bb5e98 > FS: 0000000001db2880(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 > do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315 > invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:991 > RIP: 0010:kobject_add_internal+0x8d4/0xbc0 lib/kobject.c:235 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00000000019657b0 CR3: 00000001ae0ca000 CR4: 00000000001406f0 > RSP: 0018:ffff8801ade37470 EFLAGS: 00010282 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > RAX: dffffc0000000008 RBX: ffff8801d9459190 RCX: ffffffff815b5d2e > Call Trace: > RDX: 0000000000000000 RSI: 1ffff10035bc6e3e RDI: 1ffff10035bc6e13 > RBP: ffff8801ade37568 R08: 1ffff10035bc6dd5 R09: 0000000000000000 > R10: 0000000000000001 R11: 0000000000000000 R12: 1ffff10035bc6e94 > R13: 00000000ffffffef R14: ffff8801d39ae348 R15: 1ffff10035bc6e98 > kobject_add_varg lib/kobject.c:364 [inline] > kobject_init_and_add+0xf9/0x150 lib/kobject.c:436 > gfs2_sys_fs_add+0x1ff/0x580 fs/gfs2/sys.c:652 > kobject_add_varg lib/kobject.c:364 [inline] > kobject_init_and_add+0xf9/0x150 lib/kobject.c:436 > gfs2_sys_fs_add+0x1ff/0x580 fs/gfs2/sys.c:652 > fill_super+0x86f/0x1d70 fs/gfs2/ops_fstype.c:1118 > fill_super+0x86f/0x1d70 fs/gfs2/ops_fstype.c:1118 > gfs2_mount+0x587/0x6e0 fs/gfs2/ops_fstype.c:1321 > mount_fs+0x66/0x2d0 fs/super.c:1222 > vfs_kern_mount.part.26+0xc6/0x4a0 fs/namespace.c:1037 > gfs2_mount+0x587/0x6e0 fs/gfs2/ops_fstype.c:1321 > vfs_kern_mount fs/namespace.c:2514 [inline] > do_new_mount fs/namespace.c:2517 [inline] > do_mount+0xea4/0x2b90 fs/namespace.c:2847 > mount_fs+0x66/0x2d0 fs/super.c:1222 > vfs_kern_mount.part.26+0xc6/0x4a0 fs/namespace.c:1037 > vfs_kern_mount fs/namespace.c:2514 [inline] > do_new_mount fs/namespace.c:2517 [inline] > do_mount+0xea4/0x2b90 fs/namespace.c:2847 > ksys_mount+0xab/0x120 fs/namespace.c:3063 > SYSC_mount fs/namespace.c:3077 [inline] > SyS_mount+0x39/0x50 fs/namespace.c:3074 > do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 > ksys_mount+0xab/0x120 fs/namespace.c:3063 > SYSC_mount fs/namespace.c:3077 [inline] > SyS_mount+0x39/0x50 fs/namespace.c:3074 > do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 > entry_SYSCALL_64_after_hwframe+0x42/0xb7 > RIP: 0033:0x4432fa > RSP: 002b:00007ffda3d84538 EFLAGS: 00000286 > ORIG_RAX: 00000000000000a5 > RAX: ffffffffffffffda RBX: 0000000020001a40 RCX: 00000000004432fa > RDX: 0000000020001a00 RSI: 0000000020001a40 RDI: 00007ffda3d84550 > RBP: 0000000000000000 R08: 0000000020001f00 R09: 000000000000000a > entry_SYSCALL_64_after_hwframe+0x42/0xb7 > R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000000003 > R13: 0000000000000004 R14: 0000000000000000 R15: 0000000000000000 > RIP: 0033:0x4432fa > RSP: 002b:00007ffda3d84538 EFLAGS: 00000286 > Code: > ORIG_RAX: 00000000000000a5 > RAX: ffffffffffffffda RBX: 0000000020001a40 RCX: 00000000004432fa > 00 > RDX: 0000000020001a00 RSI: 0000000020001a40 RDI: 00007ffda3d84550 > 00 > RBP: 0000000000000000 R08: 0000000020001f00 R09: 000000000000000a > 00 > R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000000003 > R13: 0000000000000004 R14: 0000000000000000 R15: 0000000000000000 > 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 aa 00 00 00 48 8b 13 48 c7 c6 80 > 8b d6 87 48 c7 c7 e0 88 d6 87 e8 3c 33 58 fa <0f> 0b e9 1d fb ff ff e8 60 4c > 88 fa 0f 0b e9 29 fe ff ff e8 54 > ---[ end trace 5eab46a9e10a0c8a ]--- > 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/f4f5e80803d0503e760569105376%40google.com. > For more options, visit https://groups.google.com/d/optout.
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