RAX: ffffffffffffffda RBX: 0000000000004c88 RCX: 00007f665ddafd59 RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007fff71bf4fe8 R09: 00007fff71bf4fe8 R10: 00007fff71bf4fe8 R11: 0000000000000246 R12: 00007fff71bf4e5c R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 ---[ end trace 113edac549385e7c ]--- general protection fault, probably for non-canonical address 0xdffffc000000001a: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000000d0-0x00000000000000d7] CPU: 1 PID: 387 Comm: syz-executor417 Tainted: G W 5.10.160-syzkaller-01321-g003c389455eb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 RIP: 0010:kill_device drivers/base/core.c:3362 [inline] RIP: 0010:device_del+0xdf/0xf00 drivers/base/core.c:3390 Code: 20 42 80 3c 28 00 74 08 48 89 df e8 6b aa 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:ffffc900009afb60 EFLAGS: 00010202 RAX: 1ffff11020b3621a RBX: ffff8881059b10d0 RCX: ffff8881065d3b40 RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc900009afae0 RBP: ffffc900009afc50 R08: dffffc0000000000 R09: fffff52000135f5d R10: fffff52000135f5d R11: 1ffff92000135f5c R12: 000000000000001a R13: dffffc0000000000 R14: ffff8881059b1108 R15: 00000000000000d0 FS: 00005555558c6300(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f665ddf301d CR3: 00000001061d6000 CR4: 00000000003506a0 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:2190 loop_control_ioctl+0x67f/0x740 drivers/block/loop.c:2289 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+0x61/0xc6 RIP: 0033:0x7f665ddafd59 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:00007fff71bf4e48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000004c88 RCX: 00007f665ddafd59 RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007fff71bf4fe8 R09: 00007fff71bf4fe8 R10: 00007fff71bf4fe8 R11: 0000000000000246 R12: 00007fff71bf4e5c R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 113edac549385e7d ]--- RIP: 0010:kill_device drivers/base/core.c:3362 [inline] RIP: 0010:device_del+0xdf/0xf00 drivers/base/core.c:3390 Code: 20 42 80 3c 28 00 74 08 48 89 df e8 6b aa 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:ffffc900009afb60 EFLAGS: 00010202 RAX: 1ffff11020b3621a RBX: ffff8881059b10d0 RCX: ffff8881065d3b40 RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc900009afae0 RBP: ffffc900009afc50 R08: dffffc0000000000 R09: fffff52000135f5d R10: fffff52000135f5d R11: 1ffff92000135f5c R12: 000000000000001a R13: dffffc0000000000 R14: ffff8881059b1108 R15: 00000000000000d0 FS: 00005555558c6300(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000556c85228230 CR3: 00000001061d6000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 20 42 80 and %al,-0x80(%rdx) 3: 3c 28 cmp $0x28,%al 5: 00 74 08 48 add %dh,0x48(%rax,%rcx,1) 9: 89 df mov %ebx,%edi b: e8 6b aa df fe callq 0xfedfaa7b 10: 4c 89 7c 24 48 mov %r15,0x48(%rsp) 15: 41 bf d0 00 00 00 mov $0xd0,%r15d 1b: 48 89 5c 24 18 mov %rbx,0x18(%rsp) 20: 4c 03 3b add (%rbx),%r15 23: 4d 89 fc mov %r15,%r12 26: 49 c1 ec 03 shr $0x3,%r12 * 2a: 43 8a 04 2c mov (%r12,%r13,1),%al <-- trapping instruction 2e: 84 c0 test %al,%al 30: 0f 85 0d 0d 00 00 jne 0xd43 36: 41 0f b6 1f movzbl (%r15),%ebx 3a: 89 de mov %ebx,%esi 3c: 83 e6 01 and $0x1,%esi 3f: 31 .byte 0x31