general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] CPU: 0 PID: 10533 Comm: syz-executor.5 Not tainted 6.1.25-syzkaller-00068-g60662882b7bd #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 RIP: 0010:idr_remove+0x27/0x60 lib/idr.c:154 Code: 47 0a 00 55 48 89 e5 41 56 53 49 89 f6 48 89 fb e8 7e 3a 78 fc 48 8d 7b 10 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 75 18 8b 43 10 49 29 c6 48 89 df 4c 89 f6 31 d2 RSP: 0018:ffffc9000cae7b78 EFLAGS: 00010202 RAX: 0000000000000004 RBX: 0000000000000010 RCX: dffffc0000000000 RDX: ffffc90001579000 RSI: 0000000000001182 RDI: 0000000000000020 RBP: ffffc9000cae7b88 R08: dffffc0000000000 R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: 1ffff11021c3960f R13: 1ffff11021c39600 R14: 00000000000495e2 R15: ffff88810e1cb000 FS: 00007f075d571700(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f075c410000 CR3: 0000000131218000 CR4: 00000000003526b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 000000000000003b DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: kernfs_put+0x357/0x520 fs/kernfs/dir.c:560 kernfs_remove_by_name_ns+0xf4/0x160 fs/kernfs/dir.c:1637 kernfs_remove_by_name include/linux/kernfs.h:631 [inline] remove_files fs/sysfs/group.c:28 [inline] sysfs_remove_group+0x10c/0x2a0 fs/sysfs/group.c:288 sysfs_remove_groups+0x56/0xb0 fs/sysfs/group.c:312 __kobject_del+0x9b/0x300 lib/kobject.c:587 kobject_del+0x45/0x60 lib/kobject.c:619 blk_unregister_queue+0x13f/0x1c0 block/blk-sysfs.c:927 del_gendisk+0x37e/0x7e0 block/genhd.c:657 loop_remove drivers/block/loop.c:2082 [inline] loop_control_remove drivers/block/loop.c:2137 [inline] loop_control_ioctl+0x5b0/0x760 drivers/block/loop.c:2175 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0x114/0x190 fs/ioctl.c:856 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f075c88c149 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f075d571168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f075c9ac120 RCX: 00007f075c88c149 RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000008 RBP: 00007f075c8e7cad R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd1be378bf R14: 00007f075d571300 R15: 0000000000022000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:idr_remove+0x27/0x60 lib/idr.c:154 Code: 47 0a 00 55 48 89 e5 41 56 53 49 89 f6 48 89 fb e8 7e 3a 78 fc 48 8d 7b 10 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <0f> b6 04 08 84 c0 75 18 8b 43 10 49 29 c6 48 89 df 4c 89 f6 31 d2 RSP: 0018:ffffc9000cae7b78 EFLAGS: 00010202 RAX: 0000000000000004 RBX: 0000000000000010 RCX: dffffc0000000000 RDX: ffffc90001579000 RSI: 0000000000001182 RDI: 0000000000000020 RBP: ffffc9000cae7b88 R08: dffffc0000000000 R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: 1ffff11021c3960f R13: 1ffff11021c39600 R14: 00000000000495e2 R15: ffff88810e1cb000 FS: 00007f075d571700(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f075c410000 CR3: 0000000131218000 CR4: 00000000003526b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 000000000000003b DR6: 00000000ffff0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 47 0a 00 rex.RXB or (%r8),%r8b 3: 55 push %rbp 4: 48 89 e5 mov %rsp,%rbp 7: 41 56 push %r14 9: 53 push %rbx a: 49 89 f6 mov %rsi,%r14 d: 48 89 fb mov %rdi,%rbx 10: e8 7e 3a 78 fc callq 0xfc783a93 15: 48 8d 7b 10 lea 0x10(%rbx),%rdi 19: 48 89 f8 mov %rdi,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 0f b6 04 08 movzbl (%rax,%rcx,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 75 18 jne 0x4a 32: 8b 43 10 mov 0x10(%rbx),%eax 35: 49 29 c6 sub %rax,%r14 38: 48 89 df mov %rbx,%rdi 3b: 4c 89 f6 mov %r14,%rsi 3e: 31 d2 xor %edx,%edx