Re: [syzbot] [mm?] [bcachefs?] WARNING in lock_list_lru_of_memcg

[syzbot <syzbot+38a0cbd267eff2d286ff@syzkaller.appspotmail.com>]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
general protection fault in call_rcu

Oops: general protection fault, probably for non-canonical address 0xef11a50f048e916c: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: maybe wild-memory-access in range [0x788d487824748b60-0x788d487824748b67]
CPU: 0 UID: 0 PID: 5968 Comm: modprobe Not tainted 6.14.0-rc3-syzkaller-g6537cfb395f3-dirty #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:lookup_object lib/debugobjects.c:423 [inline]
RIP: 0010:lookup_object_or_alloc lib/debugobjects.c:662 [inline]
RIP: 0010:debug_object_activate+0x1bd/0x580 lib/debugobjects.c:820
Code: 89 df e8 06 d5 2c fd 48 89 5c 24 30 4c 8b 3b 45 31 e4 eb 06 4d 8b 3f 41 ff c4 4d 85 ff 74 40 49 8d 5f 18 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 d4 d4 2c fd 48 8b 44 24 10 48 39
RSP: 0018:ffffc9000d09f2c0 EFLAGS: 00010006
RAX: 0f11a90f048e916c RBX: 788d487824748b60 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffffc9000d09f1a0
RBP: ffffc9000d09f3d0 R08: 0000000000000003 R09: fffff52001a13e34
R10: dffffc0000000000 R11: fffff52001a13e34 R12: 0000000000000001
R13: 1ffff92001a13e60 R14: dffffc0000000000 R15: 788d487824748b48
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f7221a9008 CR3: 0000000053bc0000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 debug_rcu_head_queue kernel/rcu/rcu.h:224 [inline]
 __call_rcu_common kernel/rcu/tree.c:3050 [inline]
 call_rcu+0x97/0xac0 kernel/rcu/tree.c:3172
 remove_vma mm/vma.c:419 [inline]
 vms_complete_munmap_vmas+0x65b/0x8f0 mm/vma.c:1202
 do_vmi_align_munmap+0x5ef/0x6f0 mm/vma.c:1445
 do_vmi_munmap+0x24e/0x2d0 mm/vma.c:1493
 __vm_munmap+0x372/0x510 mm/vma.c:2951
 elf_map fs/binfmt_elf.c:389 [inline]
 elf_load+0x2d6/0x700 fs/binfmt_elf.c:414
 load_elf_interp+0x440/0xac0 fs/binfmt_elf.c:681
 load_elf_binary+0x1a87/0x2820 fs/binfmt_elf.c:1241
 search_binary_handler fs/exec.c:1775 [inline]
 exec_binprm fs/exec.c:1807 [inline]
 bprm_execve+0x979/0x1430 fs/exec.c:1859
 kernel_execve+0x931/0xa50 fs/exec.c:2026
 call_usermodehelper_exec_async+0x237/0x380 kernel/umh.c:109
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:lookup_object lib/debugobjects.c:423 [inline]
RIP: 0010:lookup_object_or_alloc lib/debugobjects.c:662 [inline]
RIP: 0010:debug_object_activate+0x1bd/0x580 lib/debugobjects.c:820
Code: 89 df e8 06 d5 2c fd 48 89 5c 24 30 4c 8b 3b 45 31 e4 eb 06 4d 8b 3f 41 ff c4 4d 85 ff 74 40 49 8d 5f 18 48 89 d8 48 c1 e8 03 <42> 80 3c 30 00 74 08 48 89 df e8 d4 d4 2c fd 48 8b 44 24 10 48 39
RSP: 0018:ffffc9000d09f2c0 EFLAGS: 00010006
RAX: 0f11a90f048e916c RBX: 788d487824748b60 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffffc9000d09f1a0
RBP: ffffc9000d09f3d0 R08: 0000000000000003 R09: fffff52001a13e34
R10: dffffc0000000000 R11: fffff52001a13e34 R12: 0000000000000001
R13: 1ffff92001a13e60 R14: dffffc0000000000 R15: 788d487824748b48
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f7221a9008 CR3: 0000000053bc0000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	89 df                	mov    %ebx,%edi
   2:	e8 06 d5 2c fd       	call   0xfd2cd50d
   7:	48 89 5c 24 30       	mov    %rbx,0x30(%rsp)
   c:	4c 8b 3b             	mov    (%rbx),%r15
   f:	45 31 e4             	xor    %r12d,%r12d
  12:	eb 06                	jmp    0x1a
  14:	4d 8b 3f             	mov    (%r15),%r15
  17:	41 ff c4             	inc    %r12d
  1a:	4d 85 ff             	test   %r15,%r15
  1d:	74 40                	je     0x5f
  1f:	49 8d 5f 18          	lea    0x18(%r15),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 30 00       	cmpb   $0x0,(%rax,%r14,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 d4 d4 2c fd       	call   0xfd2cd50d
  39:	48 8b 44 24 10       	mov    0x10(%rsp),%rax
  3e:	48                   	rex.W
  3f:	39                   	.byte 0x39


Tested on:

commit:         6537cfb3 Merge tag 'sound-6.14-rc4' of git://git.kerne..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13732498580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b7bde34acd8f53b1
dashboard link: https://syzkaller.appspot.com/bug?extid=38a0cbd267eff2d286ff
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=10f8e5b0580000