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Fri, 26 Jun 2026 14:29:30 -0700 (PDT) Message-ID: <6a3eef3a.e743daa7.24bfe1.c86e@mx.google.com> Date: Fri, 26 Jun 2026 14:29:30 -0700 (PDT) Subject: general protection fault in reset_interrupt To: efremov@linux.com, axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Cc: syzkaller@googlegroups.com, contact@pgazz.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: sanan.hasanou@gmail.com Good day, dear maintainers, We found a bug using a modified version of syzkaller. Kernel Branch: 7.0-rc1 Kernel Config: Unfortunately, we don't have any reproducer for this bug yet. Thank you! Best regards, Sanan Hasanov floppy0: floppy_shutdown: timeout handler died. floppy0: get result error. Fdc=0 Last status=ffffffff Read bytes=0 floppy driver state ------------------- now=4294939504 last interrupt=4294939495 diff=9 last called handler=reset_interrupt timeout_message=do wakeup last output bytes: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 8 80 4294938128 8 80 4294938128 8 80 4294938128 8 80 4294938128 e 80 4294938128 13 80 4294938128 0 90 4294938128 1a 90 4294938128 0 90 4294938128 12 80 4294938128 0 90 4294938128 14 80 4294938128 18 80 4294938128 8 80 4294939495 last result at 4294939495 last redo_fd_request at 4294939495 status=d0 fdc_busy=0 cont=0000000000000000 current_req=0000000000000000 command_status=-1 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 1 UID: 0 PID: 39 Comm: kworker/u8:3 Not tainted 7.0.0-rc1 #1 PREEMPT(full) Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: floppy floppy_work_workfn RIP: 0010:reset_interrupt+0x136/0x1b0 drivers/block/floppy.c:1790 Code: 62 8d 48 c7 c2 60 ff b9 8b e8 86 98 22 fb e9 3e ff ff ff e8 9c 23 c7 fb 48 8b 1d c5 52 d5 0d 48 83 c3 10 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 6b d4 32 fc 48 8b 33 48 c7 c7 80 RSP: 0018:ffffc90000297ab0 EFLAGS: 00010212 RAX: 0000000000000002 RBX: 0000000000000010 RCX: ffff888015b53a00 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000000 RBP: ffffc90000297ac0 R08: ffffffff8f76bd77 R09: 1ffffffff1eed7ae R10: dffffc0000000000 R11: fffffbfff1eed7af R12: ffff888015718818 R13: ffffffff819609fe R14: dffffc0000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880dbbbb000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000000db2b000 CR4: 00000000000006f0 Call Trace: floppy_work_workfn+0x18/0x20 drivers/block/floppy.c:993 process_one_work kernel/workqueue.c:3275 [inline] process_scheduled_works+0xa30/0x13d0 kernel/workqueue.c:3358 worker_thread+0xacb/0x1060 kernel/workqueue.c:3439 kthread+0x388/0x470 kernel/kthread.c:467 ret_from_fork+0x5e4/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:reset_interrupt+0x136/0x1b0 drivers/block/floppy.c:1790 Code: 62 8d 48 c7 c2 60 ff b9 8b e8 86 98 22 fb e9 3e ff ff ff e8 9c 23 c7 fb 48 8b 1d c5 52 d5 0d 48 83 c3 10 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 6b d4 32 fc 48 8b 33 48 c7 c7 80 RSP: 0018:ffffc90000297ab0 EFLAGS: 00010212 RAX: 0000000000000002 RBX: 0000000000000010 RCX: ffff888015b53a00 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000000 RBP: ffffc90000297ac0 R08: ffffffff8f76bd77 R09: 1ffffffff1eed7ae R10: dffffc0000000000 R11: fffffbfff1eed7af R12: ffff888015718818 R13: ffffffff819609fe R14: dffffc0000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880dbbbb000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000000db2b000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 8d 48 c7 lea -0x39(%rax),%ecx 3: c2 60 ff ret $0xff60 6: b9 8b e8 86 98 mov $0x9886e88b,%ecx b: 22 fb and %bl,%bh d: e9 3e ff ff ff jmp 0xffffff50 12: e8 9c 23 c7 fb call 0xfbc723b3 17: 48 8b 1d c5 52 d5 0d mov 0xdd552c5(%rip),%rbx # 0xdd552e3 1e: 48 83 c3 10 add $0x10,%rbx 22: 48 89 d8 mov %rbx,%rax 25: 48 c1 e8 03 shr $0x3,%rax * 29: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 48 89 df mov %rbx,%rdi 33: e8 6b d4 32 fc call 0xfc32d4a3 38: 48 8b 33 mov (%rbx),%rsi 3b: 48 rex.W 3c: c7 .byte 0xc7 3d: c7 .byte 0xc7 3e: 80 .byte 0x80 <<<<<<<<<<<<<<< tail report >>>>>>>>>>>>>>>