kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 3364 Comm: kmmpd-loop5 Tainted: G W 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:bdevname+0x30/0xb0 block/partition-generic.c:49
Code: 41 56 41 55 41 54 53 48 89 f3 49 89 ff 49 bd 00 00 00 00 00 fc ff df e8 ae b5 49 ff 49 8d bf 80 00 00 00 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 05 e8 c4 af 77 ff 4d 8b b7 80 00 00 00 49 83 c7
RSP: 0018:ffff8881deecfdd8 EFLAGS: 00010202
RAX: 0000000000000010 RBX: ffff8881cd081050 RCX: ffff8881f37f2f40
RDX: 0000000000000000 RSI: ffff8881cd081050 RDI: 0000000000000080
RBP: ffff8881deecfe00 R08: dffffc0000000000 R09: ffffed103c104611
R10: ffffed103c104611 R11: 1ffff1103c104610 R12: ffff8881df1cddc0
R13: dffffc0000000000 R14: 0000000000000005 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001e6ac6000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
kmmpd+0x1e6/0x9a0 fs/ext4/mmp.c:158
kthread+0x31e/0x3a0 kernel/kthread.c:288
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354
Modules linked in:
---[ end trace 1db9df427189b363 ]---
RIP: 0010:bdevname+0x30/0xb0 block/partition-generic.c:49
Code: 41 56 41 55 41 54 53 48 89 f3 49 89 ff 49 bd 00 00 00 00 00 fc ff df e8 ae b5 49 ff 49 8d bf 80 00 00 00 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 05 e8 c4 af 77 ff 4d 8b b7 80 00 00 00 49 83 c7
RSP: 0018:ffff8881deecfdd8 EFLAGS: 00010202
RAX: 0000000000000010 RBX: ffff8881cd081050 RCX: ffff8881f37f2f40
RDX: 0000000000000000 RSI: ffff8881cd081050 RDI: 0000000000000080
RBP: ffff8881deecfe00 R08: dffffc0000000000 R09: ffffed103c104611
R10: ffffed103c104611 R11: 1ffff1103c104610 R12: ffff8881df1cddc0
R13: dffffc0000000000 R14: 0000000000000005 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555558d654a8 CR3: 00000001e2373000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 41 56 push %r14
2: 41 55 push %r13
4: 41 54 push %r12
6: 53 push %rbx
7: 48 89 f3 mov %rsi,%rbx
a: 49 89 ff mov %rdi,%r15
d: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13
14: fc ff df
17: e8 ae b5 49 ff call 0xff49b5ca
1c: 49 8d bf 80 00 00 00 lea 0x80(%r15),%rdi
23: 48 89 f8 mov %rdi,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction
2f: 74 05 je 0x36
31: e8 c4 af 77 ff call 0xff77affa
36: 4d 8b b7 80 00 00 00 mov 0x80(%r15),%r14
3d: 49 rex.WB
3e: 83 .byte 0x83
3f: c7 .byte 0xc7