mount_fs+0xa3/0x30c fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2469 [inline] do_mount+0x113c/0x2f10 fs/namespace.c:2799 kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 23556 Comm: syz-executor.3 Not tainted 4.19.161-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ksys_mount+0xcf/0x130 fs/namespace.c:3015 RIP: 0010:set_rgrp_preferences fs/gfs2/rgrp.c:984 [inline] RIP: 0010:gfs2_ri_update+0x289/0x520 fs/gfs2/rgrp.c:1012 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3026 Code: e0 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 e8 fc 50 51 fe 49 8d 7f 74 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 68 RSP: 0018:ffff888048f97630 EFLAGS: 00010203 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000c17a000 entry_SYSCALL_64_after_hwframe+0x49/0xbe RDX: 000000000000000e RSI: ffffffff83137ef4 RDI: 0000000000000074 RIP: 0033:0x460b4a RBP: ffff888053738800 R08: 0000000000000000 R09: 0000000000000000 Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ad 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 8a 89 fb ff c3 66 0f 1f 84 00 00 00 00 00 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000001 RSP: 002b:00007f51f98caa78 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 R13: 0000000000000000 R14: ffff8880537387fc R15: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f51f98cab10 RCX: 0000000000460b4a FS: 00007f34c6a19700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f51f98caad0 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 RBP: 00007f51f98caad0 R08: 00007f51f98cab10 R09: 0000000020000000 CR2: 00007fc5d662202a CR3: 00000000a6f36000 CR4: 00000000001406e0 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020047a20 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 kobject_add_internal failed for syz:syz with -EEXIST, don't try to register things with the same name in the same directory. Call Trace: gfs2_rindex_update+0x3ba/0x430 fs/gfs2/rgrp.c:1052 init_inodes+0x1061/0x1cf0 fs/gfs2/ops_fstype.c:819 fill_super+0x18a6/0x2550 fs/gfs2/ops_fstype.c:1153 gfs2_mount+0x4c0/0x598 fs/gfs2/ops_fstype.c:1316 mount_fs+0xa3/0x30c fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2469 [inline] do_mount+0x113c/0x2f10 fs/namespace.c:2799 ksys_mount+0xcf/0x130 fs/namespace.c:3015 __do_sys_mount fs/namespace.c:3029 [inline] __se_sys_mount fs/namespace.c:3026 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3026 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x460b4a Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ad 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 8a 89 fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007f34c6a18a78 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f34c6a18b10 RCX: 0000000000460b4a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f34c6a18ad0 RBP: 00007f34c6a18ad0 R08: 00007f34c6a18b10 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000000 R13: 0000000020000100 R14: 0000000020000200 R15: 0000000020047a20 Modules linked in: ---[ end trace 3f34793294fed8c7 ]--- gfs2: fsid=syz:syz: error -17 adding sysfs files RIP: 0010:set_rgrp_preferences fs/gfs2/rgrp.c:984 [inline] RIP: 0010:gfs2_ri_update+0x289/0x520 fs/gfs2/rgrp.c:1012 sysfs: cannot create duplicate filename '/fs/gfs2/syz:syz' CPU: 0 PID: 23586 Comm: syz-executor.4 Tainted: G D 4.19.161-syzkaller #0 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+0x1fc/0x2fe lib/dump_stack.c:118 sysfs_warn_dup.cold+0x1c/0x2d fs/sysfs/dir.c:30 sysfs_create_dir_ns+0x228/0x280 fs/sysfs/dir.c:63 Code: e0 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 e8 fc 50 51 fe 49 8d 7f 74 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 68 RSP: 0018:ffff888048f97630 EFLAGS: 00010203 create_dir lib/kobject.c:88 [inline] kobject_add_internal+0x2a5/0x9c0 lib/kobject.c:247 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000c17a000 kobject_add_varg lib/kobject.c:382 [inline] kobject_init_and_add+0x101/0x160 lib/kobject.c:453 RDX: 000000000000000e RSI: ffffffff83137ef4 RDI: 0000000000000074 gfs2_sys_fs_add+0x18e/0x440 fs/gfs2/sys.c:659 RBP: ffff888053738800 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: ffff8880537387fc R15: 0000000000000000 FS: 00007f34c6a19700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 fill_super+0x1240/0x2550 fs/gfs2/ops_fstype.c:1103 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000002c3aad8 CR3: 00000000a6f36000 CR4: 00000000001406e0 gfs2_mount+0x4c0/0x598 fs/gfs2/ops_fstype.c:1316 mount_fs+0xa3/0x30c fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961 vfs_kern_mount fs/namespace.c:951 [inline] do_new_mount fs/namespace.c:2469 [inline] do_mount+0x113c/0x2f10 fs/namespace.c:2799 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400