Good day, dear maintainers, We found a bug using a modified kernel configuration file used by syzbot. We enhanced the coverage of the configuration file using our tool, klocalizer. Kernel Branch: 6.2.0-rc5-next-20230125 Kernel config: https://drive.google.com/file/d/1qDN6q_k12wcgp6dt4jfF4hpk3Ix5FaKX/view?usp=sharing Reproducer: https://drive.google.com/file/d/11bfgp5hzObE2om0k0bNfeSIEf_SciGY1/view?usp=sharing Thank you! Best regards, Sanan Hasanov general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 4 PID: 27585 Comm: syz-executor.5 Not tainted 6.2.0-rc5-next-20230125 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 RIP: 0010:efivar_lock+0x4e/0xa0 Code: a8 28 0f fc 45 85 e4 75 3f e8 ee 2c 0f fc 48 8b 1d b7 aa c5 05 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 08 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 39 48 83 7b 08 00 74 19 e8 c0 2c 0f fc 44 89 e0 5b RSP: 0018:ffff88802549fca8 EFLAGS: 00010212 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90003cb0000 RDX: 0000000000000001 RSI: ffffffff85792a42 RDI: 0000000000000008 RBP: ffff88802549fcb8 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff82595920 R15: 0000000000000000 FS: 00007fafd9f83700(0000) GS:ffff88811a800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9e23270d78 CR3: 00000000233bb000 CR4: 0000000000350ee0 Call Trace: <TASK> efivar_entry_iter+0x29/0x150 efivarfs_kill_sb+0x2f/0x40 deactivate_locked_super+0xa6/0x190 vfs_get_super+0x235/0x2b0 get_tree_single+0x2b/0x40 efivarfs_get_tree+0x21/0x30 vfs_get_tree+0x97/0x370 __do_sys_fsconfig+0x981/0xd20 __x64_sys_fsconfig+0xc1/0x150 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc RIP: 0033:0x7fafd8e8edcd Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 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:00007fafd9f82bf8 EFLAGS: 00000246 ORIG_RAX: 00000000000001af RAX: ffffffffffffffda RBX: 00007fafd8fbbf80 RCX: 00007fafd8e8edcd RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000004 RBP: 00007fafd8efc59c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff23221a7f R14: 00007fff23221c20 R15: 00007fafd9f82d80 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:efivar_lock+0x4e/0xa0 Code: a8 28 0f fc 45 85 e4 75 3f e8 ee 2c 0f fc 48 8b 1d b7 aa c5 05 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 08 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 39 48 83 7b 08 00 74 19 e8 c0 2c 0f fc 44 89 e0 5b RSP: 0018:ffff88802549fca8 EFLAGS: 00010212 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90003cb0000 RDX: 0000000000000001 RSI: ffffffff85792a42 RDI: 0000000000000008 RBP: ffff88802549fcb8 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff82595920 R15: 0000000000000000 FS: 00007fafd9f83700(0000) GS:ffff88811a800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9e23270d78 CR3: 00000000233bb000 CR4: 0000000000350ee0 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 28 0f sub %cl,(%rdi) 2: fc cld 3: 45 85 e4 test %r12d,%r12d 6: 75 3f jne 0x47 8: e8 ee 2c 0f fc call 0xfc0f2cfb d: 48 8b 1d b7 aa c5 05 mov 0x5c5aab7(%rip),%rbx # 0x5c5aacb 14: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1b: fc ff df 1e: 48 8d 7b 08 lea 0x8(%rbx),%rdi 22: 48 89 fa mov %rdi,%rdx 25: 48 c1 ea 03 shr $0x3,%rdx * 29: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2d: 75 39 jne 0x68 2f: 48 83 7b 08 00 cmpq $0x0,0x8(%rbx) 34: 74 19 je 0x4f 36: e8 c0 2c 0f fc call 0xfc0f2cfb 3b: 44 89 e0 mov %r12d,%eax 3e: 5b pop %rbx
