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16:25:25 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ac03d65.81dddff3.363068.0002.GAE@google.com> Subject: [syzbot] [raid?] general protection fault in md_handle_request From: syzbot To: linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, song@kernel.org, syzkaller-bugs@googlegroups.com, yukuai@fnnas.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 6474fa070f2b Add linux-next specific files for 20260929 git tree: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git console output: https://syzkaller.appspot.com/x/log.txt?x=14dfe035580000 kernel config: https://syzkaller.appspot.com/x/.config?x=3477d5a04d788556 dashboard link: https://syzkaller.appspot.com/bug?extid=89a9ab2a134d092fffae compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10d876c9580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+89a9ab2a134d092fffae@syzkaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 1 UID: 0 PID: 6372 Comm: syz-executor143 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 RIP: 0010:md_handle_request+0xadd/0xe60 drivers/md/md.c:417 Code: 24 90 00 00 00 48 8b 84 24 a8 00 00 00 42 80 3c 20 00 74 08 48 89 df e8 f1 b2 93 f9 48 8b 1b 48 83 c3 18 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 d4 b2 93 f9 4c 8b 1b 48 8b bc 24 RSP: 0018:ffffc9000415f5c0 EFLAGS: 00010206 RAX: 0000000000000003 RBX: 0000000000000018 RCX: ffff88802b29ddc0 RDX: 0000000000000000 RSI: ffffffff8e9dafe5 RDI: ffff88802b29ddc0 RBP: ffffc9000415f778 R08: ffffffff88a749bc R09: 0000000000000000 R10: 0000000000000009 R11: 0000000000000000 R12: dffffc0000000000 R13: 1ffff9200082bf70 R14: ffff88807e3680c8 R15: ffff88807e368238 FS: 000055556ca3c400(0000) GS:ffff888124723000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8a7dc59000 CR3: 000000007831e000 CR4: 00000000003526f0 Call Trace: __submit_bio+0x27f/0x340 block/blk-core.c:681 __submit_bio_noacct block/blk-core.c:724 [inline] submit_bio_noacct_nocheck+0x4e8/0xa40 block/blk-core.c:792 bio_await block/bio.c:1506 [inline] submit_bio_wait+0x12a/0x250 block/bio.c:1524 __blkdev_direct_IO_simple block/fops.c:115 [inline] blkdev_direct_IO+0x1167/0x18e0 block/fops.c:451 blkdev_read_iter+0x223/0x420 block/fops.c:849 new_sync_read fs/read_write.c:493 [inline] vfs_read+0x595/0xa80 fs/read_write.c:574 ksys_pread64 fs/read_write.c:764 [inline] __do_sys_pread64 fs/read_write.c:772 [inline] __se_sys_pread64 fs/read_write.c:769 [inline] __x64_sys_pread64+0x196/0x220 fs/read_write.c:769 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8a7dca9077 Code: 48 89 fa 4c 89 df e8 98 1e 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffc5a7b78d0 EFLAGS: 00000202 ORIG_RAX: 0000000000000011 RAX: ffffffffffffffda RBX: 000055556ca3c400 RCX: 00007f8a7dca9077 RDX: 0000000000001000 RSI: 000055556ca3e000 RDI: 0000000000000009 RBP: 0000000000000096 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffc5a7b79e0 R13: 00007ffc5a7b79d4 R14: 00007ffc5a7b7954 R15: 00007f8a7dc59000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:md_handle_request+0xadd/0xe60 drivers/md/md.c:417 Code: 24 90 00 00 00 48 8b 84 24 a8 00 00 00 42 80 3c 20 00 74 08 48 89 df e8 f1 b2 93 f9 48 8b 1b 48 83 c3 18 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 d4 b2 93 f9 4c 8b 1b 48 8b bc 24 RSP: 0018:ffffc9000415f5c0 EFLAGS: 00010206 RAX: 0000000000000003 RBX: 0000000000000018 RCX: ffff88802b29ddc0 RDX: 0000000000000000 RSI: ffffffff8e9dafe5 RDI: ffff88802b29ddc0 RBP: ffffc9000415f778 R08: ffffffff88a749bc R09: 0000000000000000 R10: 0000000000000009 R11: 0000000000000000 R12: dffffc0000000000 R13: 1ffff9200082bf70 R14: ffff88807e3680c8 R15: ffff88807e368238 FS: 000055556ca3c400(0000) GS:ffff888124623000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8a7dd14100 CR3: 000000007831e000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 24 90 and $0x90,%al 2: 00 00 add %al,(%rax) 4: 00 48 8b add %cl,-0x75(%rax) 7: 84 24 a8 test %ah,(%rax,%rbp,4) a: 00 00 add %al,(%rax) c: 00 42 80 add %al,-0x80(%rdx) f: 3c 20 cmp $0x20,%al 11: 00 74 08 48 add %dh,0x48(%rax,%rcx,1) 15: 89 df mov %ebx,%edi 17: e8 f1 b2 93 f9 call 0xf993b30d 1c: 48 8b 1b mov (%rbx),%rbx 1f: 48 83 c3 18 add $0x18,%rbx 23: 48 89 d8 mov %rbx,%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: 48 89 df mov %rbx,%rdi 34: e8 d4 b2 93 f9 call 0xf993b30d 39: 4c 8b 1b mov (%rbx),%r11 3c: 48 rex.W 3d: 8b .byte 0x8b 3e: bc .byte 0xbc 3f: 24 .byte 0x24 --- 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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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