RSP: 002b:00007ffc110ebeb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007febf808e069
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000003
RBP: 00007ffc110ebed0 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000004
R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000
---[ end trace 2a683366fa6bdcf8 ]---
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: 375 Comm: syz-executor208 Tainted: G W 5.10.146-syzkaller-01235-g391716695e71 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
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 4b bf 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:ffffc9000099fb60 EFLAGS: 00010202
RAX: 1ffff11020cbe21a RBX: ffff8881065f10d0 RCX: ffff8881067b93c0
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc9000099fae0
RBP: ffffc9000099fc50 R08: dffffc0000000000 R09: fffff52000133f5d
R10: fffff52000133f5d R11: 1ffff92000133f5c R12: 000000000000001a
R13: dffffc0000000000 R14: ffff8881065f1108 R15: 00000000000000d0
FS: 0000555555e41300(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbbcc39a7f0 CR3: 0000000106b98000 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: 0033:0x7febf808e069
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:00007ffc110ebeb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007febf808e069
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000003
RBP: 00007ffc110ebed0 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000004
R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 2a683366fa6bdcf9 ]---
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 4b bf 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:ffffc9000099fb60 EFLAGS: 00010202
RAX: 1ffff11020cbe21a RBX: ffff8881065f10d0 RCX: ffff8881067b93c0
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc9000099fae0
RBP: ffffc9000099fc50 R08: dffffc0000000000 R09: fffff52000133f5d
R10: fffff52000133f5d R11: 1ffff92000133f5c R12: 000000000000001a
R13: dffffc0000000000 R14: ffff8881065f1108 R15: 00000000000000d0
FS: 0000555555e41300(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbbcc39a7f0 CR3: 0000000106b98000 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 4b bf df fe callq 0xfedfbf5b
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