RBP: 00007f08bdea1189 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff4bfb7d1f R14: 00007f08bddbd300 R15: 0000000000022000 ---[ end trace 0f756e78014ec09e ]--- 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: 430 Comm: syz-executor.0 Tainted: G W 5.10.43-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 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:ffffc900008d7ca0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff88810d567068 RCX: ffffffff84262aa9 RDX: 000000000000001a RSI: 0000000000000008 RDI: 00000000000000d0 RBP: ffffc900008d7d58 R08: 0000000000000001 R09: ffffc900008d7c3f R10: fffff5200011af87 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88810d567108 R14: fffffbfff0cdf1c8 R15: 0000000000000008 FS: 00007f08bddbd700(0000) GS:ffff8881f7300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f08bdf5b0b0 CR3: 000000010c65d000 CR4: 00000000003506a0 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: 0033:0x7f08bde47279 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:00007f08bddbd168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f08bdf59f80 RCX: 00007f08bde47279 RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000003 RBP: 00007f08bdea1189 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff4bfb7d1f R14: 00007f08bddbd300 R15: 0000000000022000 Modules linked in: ---[ end trace 0f756e78014ec09f ]--- 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:ffffc900008d7ca0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff88810d567068 RCX: ffffffff84262aa9 RDX: 000000000000001a RSI: 0000000000000008 RDI: 00000000000000d0 RBP: ffffc900008d7d58 R08: 0000000000000001 R09: ffffc900008d7c3f R10: fffff5200011af87 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88810d567108 R14: fffffbfff0cdf1c8 R15: 0000000000000008 FS: 00007f08bddbd700(0000) GS:ffff8881f7300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f08bdf5b0b0 CR3: 000000010c65d000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: c1 ea 03 shr $0x3,%edx 3: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 7: 0f 85 c5 0a 00 00 jne 0xad2 d: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 14: fc ff df 17: 4c 8b 63 68 mov 0x68(%rbx),%r12 1b: 49 8d bc 24 d0 00 00 lea 0xd0(%r12),%rdi 22: 00 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 74 06 je 0x38 32: 0f 8e a6 09 00 00 jle 0x9de 38: 41 rex.B 39: 0f .byte 0xf 3a: b6 84 mov $0x84,%dh 3c: 24 d0 and $0xd0,%al