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: 6.3.0-next-20230426 Kernel Config: https://drive.google.com/file/d/1xpe7qMUUYvHQFzqZGUzcco9jF97EwTqQ/view?usp=sharing Reproducer: https://drive.google.com/file/d/1Q8ix6EiWrzx0bWLyoGTHP721KE4Ei3qf/view?usp=sharing Thank you! Best regards, Sanan Hasanov general protection fault, probably for non-canonical address 0xdffffc0000000009: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000048-0x000000000000004f] kobject: 'loop6' (00000000df72f20a): kobject_uevent_env CPU: 2 PID: 20787 Comm: syz-executor.4 Not tainted 6.3.0-next-20230426 #1 kobject: 'loop6' (00000000df72f20a): fill_kobj_path: path = '/devices/virtual/block/loop6' Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 RIP: 0010:ext4_update_overhead+0xb3/0x1a0 Code: 00 00 e8 20 cd 57 ff 45 84 ed 0f 85 b1 00 00 00 e8 62 d2 57 ff 4c 8d 73 48 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 c8 00 00 00 4c 8b 6b 48 31 ff 4c 89 ee e8 95 cd RSP: 0018:ffff88801d51fac8 EFLAGS: 00010216 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000009 RSI: ffffffff823198fe RDI: ffffffff823198f0 RBP: ffff88801d51fae8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880516be000 R13: 0000000000000000 R14: 0000000000000048 R15: ffff8880516be000 FS: 00007f442e80f700(0000) GS:ffff88811a300000(0000) knlGS:0000000000000000 kobject: 'loop1' (00000000f3e7cad3): kobject_uevent_env CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kobject: 'loop1' (00000000f3e7cad3): fill_kobj_path: path = '/devices/virtual/block/loop1' CR2: 0000555555bfdc88 CR3: 0000000050354000 CR4: 0000000000350ee0 Call Trace: <TASK> ext4_fill_super+0x30c8/0xb8d0 get_tree_bdev+0x447/0x770 ext4_get_tree+0x21/0x30 vfs_get_tree+0x97/0x370 path_mount+0x6d3/0x1fb0 __x64_sys_mount+0x2b2/0x340 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc RIP: 0033:0x7f442d69176e Code: 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 a5 00 00 00 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:00007f442e80ea08 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f442d69176e RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f442e80ea60 RBP: 00007f442e80eaa0 R08: 00007f442e80eaa0 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f442e80ea60 R15: 00000000200008c0 </TASK> Modules linked in: kobject: 'loop2' (0000000027c67f3b): kobject_uevent_env kobject: 'loop2' (0000000027c67f3b): fill_kobj_path: path = '/devices/virtual/block/loop2' ---[ end trace 0000000000000000 ]--- kobject: 'loop2' (0000000027c67f3b): kobject_uevent_env RIP: 0010:ext4_update_overhead+0xb3/0x1a0 kobject: 'loop2' (0000000027c67f3b): fill_kobj_path: path = '/devices/virtual/block/loop2' Code: 00 00 e8 20 cd 57 ff 45 84 ed 0f 85 b1 00 00 00 e8 62 d2 57 ff 4c 8d 73 48 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 c8 00 00 00 4c 8b 6b 48 31 ff 4c 89 ee e8 95 cd RSP: 0018:ffff88801d51fac8 EFLAGS: 00010216 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000009 RSI: ffffffff823198fe RDI: ffffffff823198f0 RBP: ffff88801d51fae8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880516be000 R13: 0000000000000000 R14: 0000000000000048 R15: ffff8880516be000 kobject: 'loop2' (0000000027c67f3b): kobject_uevent_env FS: 00007f442e80f700(0000) GS:ffff88811a300000(0000) knlGS:0000000000000000 kobject: 'loop2' (0000000027c67f3b): kobject_uevent_env: uevent_suppress caused the event to drop! CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kobject: 'loop2' (0000000027c67f3b): kobject_uevent_env kobject: 'loop2' (0000000027c67f3b): kobject_uevent_env: uevent_suppress caused the event to drop! loop2: detected capacity change from 0 to 64 CR2: 00007f42967bd0b0 CR3: 0000000050354000 CR4: 0000000000350ee0 kobject: 'loop2' (0000000027c67f3b): kobject_uevent_env ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: e8 20 cd 57 ff call 0xff57cd27 7: 45 84 ed test %r13b,%r13b a: 0f 85 b1 00 00 00 jne 0xc1 10: e8 62 d2 57 ff call 0xff57d277 15: 4c 8d 73 48 lea 0x48(%rbx),%r14 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 4c 89 f2 mov %r14,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 c8 00 00 00 jne 0xfc 34: 4c 8b 6b 48 mov 0x48(%rbx),%r13 38: 31 ff xor %edi,%edi 3a: 4c 89 ee mov %r13,%rsi 3d: e8 .byte 0xe8 3e: 95 xchg %eax,%ebp 3f: cd .byte 0xcd
