[syzbot] [ext4?] linux-next test error: general protection fault in __bh_submit
From: syzbot <hidden>
Date: 2026-09-05 16:35:26
Also in:
linux-next, lkml
Hello, syzbot found the following issue on: HEAD commit: 32b6ef9a5d0e Add linux-next specific files for 20260902 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=14b44125580000 kernel config: https://syzkaller.appspot.com/x/.config?x=32ceed1c94c11059 dashboard link: https://syzkaller.appspot.com/bug?extid=5a7a23af225c215902e7 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/9a1f38fb6f24/disk-32b6ef9a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f3152eed43a4/vmlinux-32b6ef9a.xz kernel image: https://storage.googleapis.com/syzbot-assets/e7fbd36e1b12/bzImage-32b6ef9a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5a7a23af225c215902e7@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 UID: 0 PID: 4945 Comm: jbd2/sda1-8 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:const_folio_flags include/linux/page-flags.h:345 [inline] RIP: 0010:folio_test_dropbehind include/linux/page-flags.h:600 [inline] RIP: 0010:__bh_submit+0x22d/0x8d0 fs/buffer.c:1109 Code: c1 e8 03 48 89 44 24 18 42 80 3c 20 00 74 08 48 89 df e8 26 f6 d7 ff 48 89 5c 24 28 48 8b 1b 4c 8d 7b 08 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 04 f6 d7 ff 4d 8b 3f 4c 89 fe 48 RSP: 0018:ffffc9001016f868 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff84b96ff9 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff888075a7a660 RBP: 0000000000009801 R08: ffff888075a7a6bf R09: 1ffff1100eb4f4d7 R10: dffffc0000000000 R11: ffffed100eb4f4d8 R12: dffffc0000000000 R13: ffff888075a7a640 R14: ffff8880123a17e0 R15: 0000000000000008 FS: 0000000000000000(0000) GS:ffff888124ccb000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe1ee627da0 CR3: 0000000074fa8000 CR4: 00000000003526f0 Call Trace: <TASK> jbd2_journal_commit_transaction+0x22a9/0x5cd0 fs/jbd2/commit.c:751 kjournald2+0x3bc/0x750 fs/jbd2/journal.c:200 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:const_folio_flags include/linux/page-flags.h:345 [inline] RIP: 0010:folio_test_dropbehind include/linux/page-flags.h:600 [inline] RIP: 0010:__bh_submit+0x22d/0x8d0 fs/buffer.c:1109 Code: c1 e8 03 48 89 44 24 18 42 80 3c 20 00 74 08 48 89 df e8 26 f6 d7 ff 48 89 5c 24 28 48 8b 1b 4c 8d 7b 08 4c 89 f8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ff e8 04 f6 d7 ff 4d 8b 3f 4c 89 fe 48 RSP: 0018:ffffc9001016f868 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff84b96ff9 RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff888075a7a660 RBP: 0000000000009801 R08: ffff888075a7a6bf R09: 1ffff1100eb4f4d7 R10: dffffc0000000000 R11: ffffed100eb4f4d8 R12: dffffc0000000000 R13: ffff888075a7a640 R14: ffff8880123a17e0 R15: 0000000000000008 FS: 0000000000000000(0000) GS:ffff888124dcb000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f87c696cf80 CR3: 000000000eb48000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: c1 e8 03 shr $0x3,%eax 3: 48 89 44 24 18 mov %rax,0x18(%rsp) 8: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) d: 74 08 je 0x17 f: 48 89 df mov %rbx,%rdi 12: e8 26 f6 d7 ff call 0xffd7f63d 17: 48 89 5c 24 28 mov %rbx,0x28(%rsp) 1c: 48 8b 1b mov (%rbx),%rbx 1f: 4c 8d 7b 08 lea 0x8(%rbx),%r15 23: 4c 89 f8 mov %r15,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 ff mov %r15,%rdi 34: e8 04 f6 d7 ff call 0xffd7f63d 39: 4d 8b 3f mov (%r15),%r15 3c: 4c 89 fe mov %r15,%rsi 3f: 48 rex.W --- 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@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup