Oops: general protection fault, probably for non-canonical address 0xdffffc00000000f4: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x00000000000007a0-0x00000000000007a7] CPU: 0 UID: 0 PID: 8377 Comm: syz.7.447 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:__mem_cgroup_free+0xa1/0x200 mm/memcontrol.c:3940 Code: 49 01 ef 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 a0 e2 f6 ff 4d 8b 3f 4d 8d a7 a0 07 00 00 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 80 e2 f6 ff 49 8b 3c 24 48 85 ff RSP: 0000:ffffc900038d7ad0 EFLAGS: 00010202 RAX: 00000000000000f4 RBX: 1ffffffff202488a RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88801ce8a940 RBP: ffff88801ce8b630 R08: ffffffff8e8b67e3 R09: 1ffffffff1d16cfc R10: dffffc0000000000 R11: fffffbfff1d16cfd R12: 00000000000007a0 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f0f5bf7d6c0(0000) GS:ffff888125448000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc684f6b000 CR3: 000000007939a000 CR4: 00000000003526f0 Call Trace: mem_cgroup_alloc mm/memcontrol.c:4028 [inline] mem_cgroup_css_alloc+0x480/0x1e70 mm/memcontrol.c:4040 css_create kernel/cgroup/cgroup.c:5749 [inline] cgroup_apply_control_enable+0x5cd/0xd50 kernel/cgroup/cgroup.c:3328 cgroup_mkdir+0xcfb/0xf50 kernel/cgroup/cgroup.c:5975 kernfs_iop_mkdir+0x211/0x350 fs/kernfs/dir.c:1286 vfs_mkdir+0x413/0x630 fs/namei.c:5255 filename_mkdirat+0x285/0x510 fs/namei.c:5288 __do_sys_mkdirat fs/namei.c:5309 [inline] __se_sys_mkdirat+0x35/0x150 fs/namei.c:5306 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0f5b19c799 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0f5bf7d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f0f5b415fa0 RCX: 00007f0f5b19c799 RDX: 00000000000001ff RSI: 0000200000000000 RDI: ffffffffffffff9c RBP: 00007f0f5b232c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0f5b416038 R14: 00007f0f5b415fa0 R15: 00007fff99c34518 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__mem_cgroup_free+0xa1/0x200 mm/memcontrol.c:3940 Code: 49 01 ef 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 a0 e2 f6 ff 4d 8b 3f 4d 8d a7 a0 07 00 00 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 80 e2 f6 ff 49 8b 3c 24 48 85 ff RSP: 0000:ffffc900038d7ad0 EFLAGS: 00010202 RAX: 00000000000000f4 RBX: 1ffffffff202488a RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88801ce8a940 RBP: ffff88801ce8b630 R08: ffffffff8e8b67e3 R09: 1ffffffff1d16cfc R10: dffffc0000000000 R11: fffffbfff1d16cfd R12: 00000000000007a0 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f0f5bf7d6c0(0000) GS:ffff888125548000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f39da5e92f8 CR3: 000000007939a000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 49 01 ef add %rbp,%r15 3: 4c 89 f8 mov %r15,%rax 6: 48 c1 e8 03 shr $0x3,%rax a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) f: 74 08 je 0x19 11: 4c 89 ff mov %r15,%rdi 14: e8 a0 e2 f6 ff call 0xfff6e2b9 19: 4d 8b 3f mov (%r15),%r15 1c: 4d 8d a7 a0 07 00 00 lea 0x7a0(%r15),%r12 23: 4c 89 e0 mov %r12,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 e7 mov %r12,%rdi 34: e8 80 e2 f6 ff call 0xfff6e2b9 39: 49 8b 3c 24 mov (%r12),%rdi 3d: 48 85 ff test %rdi,%rdi