Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc46516738 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f535f7010a9 RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000005 RBP: 00007ffc46516750 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000004 R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 ---[ end trace 24ac1218322fb734 ]--- 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: 412 Comm: syz-executor199 Tainted: G W 5.10.43-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:kill_device drivers/base/core.c:3354 [inline] RIP: 0010:device_del+0xe3/0xd00 drivers/base/core.c:3382 Code: c1 ea 03 80 3c 02 00 0f 85 c5 0a 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 63 68 49 8d bc 24 d0 00 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 06 0f 8e a6 09 00 00 41 0f b6 84 24 d0 00 00 RSP: 0018:ffffc9000053fca0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff88810a302068 RCX: ffffffff84262aa9 RDX: 000000000000001a RSI: 0000000000000008 RDI: 00000000000000d0 RBP: ffffc9000053fd58 R08: 0000000000000001 R09: ffffc9000053fc3f R10: fffff520000a7f87 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88810a302108 R14: fffffbfff0cdf1c8 R15: 0000000000000008 FS: 0000555556c5c300(0000) GS:ffff8881f7200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f535f7309e0 CR3: 0000000117923000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: del_gendisk+0x611/0xa60 block/genhd.c:953 loop_remove drivers/block/loop.c:2194 [inline] loop_control_ioctl drivers/block/loop.c:2293 [inline] loop_control_ioctl+0x30d/0x3d0 drivers/block/loop.c:2259 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x129/0x1a0 fs/ioctl.c:739 do_syscall_64+0x32/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f535f7010a9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc46516738 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f535f7010a9 RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000005 RBP: 00007ffc46516750 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000004 R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 24ac1218322fb735 ]--- RIP: 0010:kill_device drivers/base/core.c:3354 [inline] RIP: 0010:device_del+0xe3/0xd00 drivers/base/core.c:3382 Code: c1 ea 03 80 3c 02 00 0f 85 c5 0a 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 63 68 49 8d bc 24 d0 00 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 06 0f 8e a6 09 00 00 41 0f b6 84 24 d0 00 00 RSP: 0018:ffffc9000053fca0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff88810a302068 RCX: ffffffff84262aa9 RDX: 000000000000001a RSI: 0000000000000008 RDI: 00000000000000d0 RBP: ffffc9000053fd58 R08: 0000000000000001 R09: ffffc9000053fc3f R10: fffff520000a7f87 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88810a302108 R14: fffffbfff0cdf1c8 R15: 0000000000000008 FS: 0000555556c5c300(0000) GS:ffff8881f7200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f535f7309e0 CR3: 0000000117923000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 28 00 sub %al,(%rax) 2: 00 00 add %al,(%rax) 4: 75 05 jne 0xb 6: 48 83 c4 28 add $0x28,%rsp a: c3 retq b: e8 b1 14 00 00 callq 0x14c1 10: 90 nop 11: 48 89 f8 mov %rdi,%rax 14: 48 89 f7 mov %rsi,%rdi 17: 48 89 d6 mov %rdx,%rsi 1a: 48 89 ca mov %rcx,%rdx 1d: 4d 89 c2 mov %r8,%r10 20: 4d 89 c8 mov %r9,%r8 23: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9 28: 0f 05 syscall * 2a: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction 30: 73 01 jae 0x33 32: c3 retq 33: 48 c7 c1 c0 ff ff ff mov $0xffffffffffffffc0,%rcx 3a: f7 d8 neg %eax 3c: 64 89 01 mov %eax,%fs:(%rcx) 3f: 48 rex.W