Hello, syzbot found the following issue on: HEAD commit: 0d52778b Add linux-next specific files for 20201218 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=16190613500000 kernel config: https://syzkaller.appspot.com/x/.config?x=5c81cc44aa25b5b3 dashboard link: https://syzkaller.appspot.com/bug?extid=3002ac6b4fd242a64228 compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=128f5123500000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14f9f30f500000 The issue was bisected to: commit e810c942a325cf749e859d7aa3a43dc219cea299 Author: Jan Kara <jack@xxxxxxx> Date: Wed Dec 16 10:18:40 2020 +0000 ext4: save error info to sb through journal if available bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12d9df07500000 final oops: https://syzkaller.appspot.com/x/report.txt?x=11d9df07500000 console output: https://syzkaller.appspot.com/x/log.txt?x=16d9df07500000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3002ac6b4fd242a64228@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: e810c942a325 ("ext4: save error info to sb through journal if available") EXT4-fs error (device loop3): ext4_fill_super:4943: inode #2: comm syz-executor723: iget: root inode unallocated EXT4-fs (loop3): get root inode failed EXT4-fs (loop3): mount failed ------------[ cut here ]------------ ODEBUG: free active (active state 0) object type: work_struct hint: flush_stashed_error_work+0x0/0x2a0 fs/ext4/ext4.h:2040 WARNING: CPU: 0 PID: 13670 at lib/debugobjects.c:505 debug_print_object+0x16e/0x250 lib/debugobjects.c:505 Modules linked in: CPU: 0 PID: 13670 Comm: syz-executor723 Not tainted 5.10.0-next-20201218-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:debug_print_object+0x16e/0x250 lib/debugobjects.c:505 Code: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 af 00 00 00 48 8b 14 dd 20 af bf 89 4c 89 ee 48 c7 c7 20 a3 bf 89 e8 30 78 05 05 <0f> 0b 83 05 55 8a b9 09 01 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e c3 RSP: 0018:ffffc90001d0f9b8 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: ffff888024b63600 RSI: ffffffff815b95f5 RDI: fffff520003a1f29 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815b7a4b R11: 0000000000000000 R12: ffffffff896ae040 R13: ffffffff89bfa920 R14: ffffffff814911f0 R15: dffffc0000000000 FS: 000000000163a940(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000043fb60 CR3: 000000001226b000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __debug_check_no_obj_freed lib/debugobjects.c:987 [inline] debug_check_no_obj_freed+0x309/0x430 lib/debugobjects.c:1018 slab_free_hook mm/slub.c:1540 [inline] slab_free_freelist_hook+0x12b/0x1d0 mm/slub.c:1586 slab_free mm/slub.c:3157 [inline] kfree+0xdb/0x3c0 mm/slub.c:4156 ext4_fill_super+0x86c/0xdf40 fs/ext4/super.c:5174 mount_bdev+0x34d/0x410 fs/super.c:1366 legacy_get_tree+0x105/0x220 fs/fs_context.c:592 vfs_get_tree+0x89/0x2f0 fs/super.c:1496 do_new_mount fs/namespace.c:2896 [inline] path_mount+0x12ae/0x1e70 fs/namespace.c:3227 do_mount fs/namespace.c:3240 [inline] __do_sys_mount fs/namespace.c:3448 [inline] __se_sys_mount fs/namespace.c:3425 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3425 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x44873a Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 cd a2 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 aa a2 fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007fff16496da8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fff16496e00 RCX: 000000000044873a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fff16496dc0 RBP: 00007fff16496dc0 R08: 00007fff16496e00 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000006 R13: 0000000000000005 R14: 0000000000000004 R15: 0000000000000004 --- This report 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 issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
