Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6497a13168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f6497baff60 RCX: 00007f6497a9d0e9 RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000004 RBP: 00007f6497af708d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdca8dce8f R14: 00007f6497a13300 R15: 0000000000022000 ---[ end trace da48805da5d4376a ]--- general protection fault, probably for non-canonical address 0xdffffc000000001a: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000000d0-0x00000000000000d7] CPU: 0 PID: 460 Comm: syz-executor.5 Tainted: G W 5.10.101-syzkaller-00009-g0dcfc2c03655 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kill_device drivers/base/core.c:3361 [inline] RIP: 0010:device_del+0xdf/0xf00 drivers/base/core.c:3389 Code: 20 42 80 3c 28 00 74 08 48 89 df e8 eb 42 df fe 4c 89 7c 24 48 41 bf d0 00 00 00 48 89 5c 24 18 4c 03 3b 4d 89 fc 49 c1 ec 03 <43> 8a 04 2c 84 c0 0f 85 0d 0d 00 00 41 0f b6 1f 89 de 83 e6 01 31 RSP: 0018:ffffc90001097b60 EFLAGS: 00010202 RAX: 1ffff110242db01a RBX: ffff8881216d80d0 RCX: ffffffff8491bca6 RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc90001097ae0 RBP: ffffc90001097c50 R08: dffffc0000000000 R09: fffff52000212f5d R10: fffff52000212f5d R11: 1ffff92000212f5c R12: 000000000000001a R13: dffffc0000000000 R14: ffff8881216d8108 R15: 00000000000000d0 FS: 00007f6497a13700(0000) GS:ffff8881f7200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa5ff8ab718 CR3: 000000010f764000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: del_gendisk+0xbf2/0xe20 block/genhd.c:953 loop_remove+0x46/0xb0 drivers/block/loop.c:2185 loop_control_ioctl+0x67f/0x740 drivers/block/loop.c:2284 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl+0x115/0x190 fs/ioctl.c:739 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:739 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f6497a9d0e9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6497a13168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f6497baff60 RCX: 00007f6497a9d0e9 RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000004 RBP: 00007f6497af708d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdca8dce8f R14: 00007f6497a13300 R15: 0000000000022000 Modules linked in: ---[ end trace da48805da5d4376b ]--- RIP: 0010:kill_device drivers/base/core.c:3361 [inline] RIP: 0010:device_del+0xdf/0xf00 drivers/base/core.c:3389 Code: 20 42 80 3c 28 00 74 08 48 89 df e8 eb 42 df fe 4c 89 7c 24 48 41 bf d0 00 00 00 48 89 5c 24 18 4c 03 3b 4d 89 fc 49 c1 ec 03 <43> 8a 04 2c 84 c0 0f 85 0d 0d 00 00 41 0f b6 1f 89 de 83 e6 01 31 RSP: 0018:ffffc90001097b60 EFLAGS: 00010202 RAX: 1ffff110242db01a RBX: ffff8881216d80d0 RCX: ffffffff8491bca6 RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc90001097ae0 RBP: ffffc90001097c50 R08: dffffc0000000000 R09: fffff52000212f5d R10: fffff52000212f5d R11: 1ffff92000212f5c R12: 000000000000001a R13: dffffc0000000000 R14: ffff8881216d8108 R15: 00000000000000d0 FS: 00007f6497a13700(0000) GS:ffff8881f7200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa5ff8ab718 CR3: 000000010f764000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: ff c3 inc %ebx 2: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) 9: 00 00 00 c: 0f 1f 40 00 nopl 0x0(%rax) 10: 48 89 f8 mov %rdi,%rax 13: 48 89 f7 mov %rsi,%rdi 16: 48 89 d6 mov %rdx,%rsi 19: 48 89 ca mov %rcx,%rdx 1c: 4d 89 c2 mov %r8,%r10 1f: 4d 89 c8 mov %r9,%r8 22: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9 27: 0f 05 syscall * 29: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction 2f: 73 01 jae 0x32 31: c3 retq 32: 48 c7 c1 b8 ff ff ff mov $0xffffffffffffffb8,%rcx 39: f7 d8 neg %eax 3b: 64 89 01 mov %eax,%fs:(%rcx) 3e: 48 rex.W