Hello, syzbot found the following issue on: HEAD commit: 568035b01cfb Linux 6.0-rc1 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=169f00cb080000 kernel config: https://syzkaller.appspot.com/x/.config?x=3b9175e0879a7749 dashboard link: https://syzkaller.appspot.com/bug?extid=90d970f179aab5888426 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+90d970f179aab5888426@xxxxxxxxxxxxxxxxxxxxxxxxx general protection fault, probably for non-canonical address 0xffff000000000800: 0000 [#1] PREEMPT SMP KASAN KASAN: maybe wild-memory-access in range [0xfff8200000004000-0xfff8200000004007] CPU: 0 PID: 24 Comm: kdevtmpfs Not tainted 6.0.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 RIP: 0010:freelist_dereference mm/slub.c:347 [inline] RIP: 0010:get_freepointer mm/slub.c:354 [inline] RIP: 0010:get_freepointer_safe mm/slub.c:368 [inline] RIP: 0010:slab_alloc_node mm/slub.c:3211 [inline] RIP: 0010:slab_alloc mm/slub.c:3251 [inline] RIP: 0010:__kmem_cache_alloc_lru mm/slub.c:3258 [inline] RIP: 0010:kmem_cache_alloc+0xf6/0x3b0 mm/slub.c:3268 Code: 51 08 48 8b 01 48 83 79 10 00 48 89 04 24 0f 84 99 02 00 00 48 85 c0 0f 84 90 02 00 00 49 8b 3c 24 41 8b 4c 24 28 40 f6 c7 0f <48> 8b 1c 08 0f 85 9f 02 00 00 48 8d 4a 08 65 48 0f c7 0f 0f 94 c0 RSP: 0000:ffffc900001efcc0 EFLAGS: 00010246 RAX: ffff000000000000 RBX: 0000000000001000 RCX: 0000000000000800 RDX: 00000000000021e0 RSI: 0000000000000cc0 RDI: 00000000000410f0 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff888140007500 R13: ffffffff81da9ebe R14: 0000000000000cc0 R15: 0000000000000cc0 FS: 0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88823ffff000 CR3: 000000000bc8e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> getname_kernel+0x4e/0x370 fs/namei.c:227 kern_path_create+0x20/0x50 fs/namei.c:3823 handle_create+0xa8/0x4b3 drivers/base/devtmpfs.c:218 handle drivers/base/devtmpfs.c:391 [inline] devtmpfs_work_loop drivers/base/devtmpfs.c:406 [inline] devtmpfsd+0x1a4/0x2a3 drivers/base/devtmpfs.c:448 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:freelist_dereference mm/slub.c:347 [inline] RIP: 0010:get_freepointer mm/slub.c:354 [inline] RIP: 0010:get_freepointer_safe mm/slub.c:368 [inline] RIP: 0010:slab_alloc_node mm/slub.c:3211 [inline] RIP: 0010:slab_alloc mm/slub.c:3251 [inline] RIP: 0010:__kmem_cache_alloc_lru mm/slub.c:3258 [inline] RIP: 0010:kmem_cache_alloc+0xf6/0x3b0 mm/slub.c:3268 Code: 51 08 48 8b 01 48 83 79 10 00 48 89 04 24 0f 84 99 02 00 00 48 85 c0 0f 84 90 02 00 00 49 8b 3c 24 41 8b 4c 24 28 40 f6 c7 0f <48> 8b 1c 08 0f 85 9f 02 00 00 48 8d 4a 08 65 48 0f c7 0f 0f 94 c0 RSP: 0000:ffffc900001efcc0 EFLAGS: 00010246 RAX: ffff000000000000 RBX: 0000000000001000 RCX: 0000000000000800 RDX: 00000000000021e0 RSI: 0000000000000cc0 RDI: 00000000000410f0 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff888140007500 R13: ffffffff81da9ebe R14: 0000000000000cc0 R15: 0000000000000cc0 FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000000bc8e000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 51 push %rcx 1: 08 48 8b or %cl,-0x75(%rax) 4: 01 48 83 add %ecx,-0x7d(%rax) 7: 79 10 jns 0x19 9: 00 48 89 add %cl,-0x77(%rax) c: 04 24 add $0x24,%al e: 0f 84 99 02 00 00 je 0x2ad 14: 48 85 c0 test %rax,%rax 17: 0f 84 90 02 00 00 je 0x2ad 1d: 49 8b 3c 24 mov (%r12),%rdi 21: 41 8b 4c 24 28 mov 0x28(%r12),%ecx 26: 40 f6 c7 0f test $0xf,%dil * 2a: 48 8b 1c 08 mov (%rax,%rcx,1),%rbx <-- trapping instruction 2e: 0f 85 9f 02 00 00 jne 0x2d3 34: 48 8d 4a 08 lea 0x8(%rdx),%rcx 38: 65 48 0f c7 0f cmpxchg16b %gs:(%rdi) 3d: 0f 94 c0 sete %al --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
