do_vfs_ioctl+0x742/0x1720 fs/ioctl.c:47
ksys_ioctl fs/ioctl.c:742 [inline]
__do_sys_ioctl fs/ioctl.c:749 [inline]
__se_sys_ioctl fs/ioctl.c:747 [inline]
__x64_sys_ioctl+0xd4/0x110 fs/ioctl.c:747
do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
---[ end trace c7de77ef8c43dad5 ]---
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 359 Comm: syz-executor277 Tainted: G W 5.4.254-syzkaller-00011-g2ac128c04e33 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
RIP: 0010:kill_device drivers/base/core.c:3022 [inline]
RIP: 0010:device_del+0xe7/0xfa0 drivers/base/core.c:3049
Code: df e8 6d e7 fd fe 4c 89 7c 24 18 41 bf c8 00 00 00 48 89 5c 24 08 4c 03 3b 4d 89 fc 49 c1 ec 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 04 04 84 c0 0f 85 31 0e 00 00 41 0f b6 1f 89 de 83 e6 01
RSP: 0018:ffff8881de09f9c0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8881dc0650d8 RCX: 1ffff1103b80ca1b
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff8881de09f940
RBP: ffff8881de09fa90 R08: dffffc0000000000 R09: ffffed103bc13f29
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000019
R13: ffff8881dc065070 R14: ffff8881dc065110 R15: 00000000000000c8
FS: 00005555569bf380(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561d46168d60 CR3: 00000001dc0e8000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
del_gendisk+0x9d9/0xc30 block/genhd.c:835
loop_remove+0x42/0xa0 drivers/block/loop.c:2194
loop_control_ioctl+0x564/0x620 drivers/block/loop.c:2293
do_vfs_ioctl+0x742/0x1720 fs/ioctl.c:47
ksys_ioctl fs/ioctl.c:742 [inline]
__do_sys_ioctl fs/ioctl.c:749 [inline]
__se_sys_ioctl fs/ioctl.c:747 [inline]
__x64_sys_ioctl+0xd4/0x110 fs/ioctl.c:747
do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x5c/0xc1
Modules linked in:
---[ end trace c7de77ef8c43dad6 ]---
RIP: 0010:kill_device drivers/base/core.c:3022 [inline]
RIP: 0010:device_del+0xe7/0xfa0 drivers/base/core.c:3049
Code: df e8 6d e7 fd fe 4c 89 7c 24 18 41 bf c8 00 00 00 48 89 5c 24 08 4c 03 3b 4d 89 fc 49 c1 ec 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 04 04 84 c0 0f 85 31 0e 00 00 41 0f b6 1f 89 de 83 e6 01
RSP: 0018:ffff8881de09f9c0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8881dc0650d8 RCX: 1ffff1103b80ca1b
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff8881de09f940
RBP: ffff8881de09fa90 R08: dffffc0000000000 R09: ffffed103bc13f29
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000019
R13: ffff8881dc065070 R14: ffff8881dc065110 R15: 00000000000000c8
FS: 00005555569bf380(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561d46168d60 CR3: 00000001dc0e8000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: df e8 fucomip %st(0),%st
2: 6d insl (%dx),%es:(%rdi)
3: e7 fd out %eax,$0xfd
5: fe 4c 89 7c decb 0x7c(%rcx,%rcx,4)
9: 24 18 and $0x18,%al
b: 41 bf c8 00 00 00 mov $0xc8,%r15d
11: 48 89 5c 24 08 mov %rbx,0x8(%rsp)
16: 4c 03 3b add (%rbx),%r15
19: 4d 89 fc mov %r15,%r12
1c: 49 c1 ec 03 shr $0x3,%r12
20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
27: fc ff df
* 2a: 41 0f b6 04 04 movzbl (%r12,%rax,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 0f 85 31 0e 00 00 jne 0xe68
37: 41 0f b6 1f movzbl (%r15),%ebx
3b: 89 de mov %ebx,%esi
3d: 83 e6 01 and $0x1,%esi