#syz dup: general protection fault in ext4_commit_super On Mon 21-12-20 23:54:18, syzbot wrote: > 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 -- Jan Kara <jack@xxxxxxxx> SUSE Labs, CR
