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Message-ID: <69359b9c.a70a0220.38f243.005d.GAE@google.com> Date: Sun, 07 Dec 2025 07:22:04 -0800 From: syzbot <syzbot+e008db2ac01e282550ee@...kaller.appspotmail.com> To: kartikey406@...il.com, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [mm?] general protection fault in lru_gen_test_recent (2) Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: general protection fault in lru_gen_test_recent DEBUG: memcg_id=0 memcg=0000000000000000 root_mem_cgroup=ffff88801cac8000 DEBUG: memcg is NULL, using root_mem_cgroup DEBUG: after assignment memcg=ffff88801cac8000 DEBUG: about to call mem_cgroup_lruvec with memcg=ffff88801cac8000 Oops: general protection fault, probably for non-canonical address 0xdffffc00000009c0: 0000 [#1] SMP KASAN NOPTI KASAN: probably user-memory-access in range [0x0000000000004e00-0x0000000000004e07] CPU: 0 UID: 0 PID: 6414 Comm: syz.0.20 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:mem_cgroup_lruvec include/linux/memcontrol.h:720 [inline] RIP: 0010:lru_gen_test_recent+0x14a/0x420 mm/workingset.c:282 Code: dc 7f b5 ff 48 85 db 0f 84 a4 01 00 00 e8 ce 7f b5 ff 49 8d be 00 4e 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 10 02 00 00 4d 63 ae 00 4e 00 RSP: 0018:ffffc9000177f828 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff88801cac8000 RCX: ffffffff819c8d55 RDX: 00000000000009c0 RSI: ffffffff820964a2 RDI: 0000000000004e00 RBP: ffffc9000177f8c0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: ffff888026ad8b30 R12: ffffc9000177f8e0 R13: ffffffff90882820 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fb55eb846c0(0000) GS:ffff8880d6909000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000409000000 CR3: 0000000022e91000 CR4: 0000000000352ef0 Call Trace: <TASK> lru_gen_refault mm/workingset.c:303 [inline] workingset_refault+0x251/0xca0 mm/workingset.c:553 filemap_add_folio+0x23d/0x610 mm/filemap.c:981 do_read_cache_folio+0x23c/0x5c0 mm/filemap.c:4063 freader_get_folio+0x33a/0x930 lib/buildid.c:58 freader_fetch+0xbd/0x740 lib/buildid.c:101 __build_id_parse.isra.0+0xdd/0x6c0 lib/buildid.c:289 do_procmap_query+0xb0e/0x1080 fs/proc/task_mmu.c:733 procfs_procmap_ioctl+0x9d/0xe0 fs/proc/task_mmu.c:813 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb55dd8f7c9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb55eb84038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fb55dfe5fa0 RCX: 00007fb55dd8f7c9 RDX: 0000200000000180 RSI: 00000000c0686611 RDI: 0000000000000003 RBP: 00007fb55de13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb55dfe6038 R14: 00007fb55dfe5fa0 R15: 00007ffd3962a3c8 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:mem_cgroup_lruvec include/linux/memcontrol.h:720 [inline] RIP: 0010:lru_gen_test_recent+0x14a/0x420 mm/workingset.c:282 Code: dc 7f b5 ff 48 85 db 0f 84 a4 01 00 00 e8 ce 7f b5 ff 49 8d be 00 4e 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 10 02 00 00 4d 63 ae 00 4e 00 RSP: 0018:ffffc9000177f828 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffff88801cac8000 RCX: ffffffff819c8d55 RDX: 00000000000009c0 RSI: ffffffff820964a2 RDI: 0000000000004e00 RBP: ffffc9000177f8c0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: ffff888026ad8b30 R12: ffffc9000177f8e0 R13: ffffffff90882820 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fb55eb846c0(0000) GS:ffff8880d6909000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000409000000 CR3: 0000000022e91000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: dc 7f b5 fdivrl -0x4b(%rdi) 3: ff 48 85 decl -0x7b(%rax) 6: db 0f fisttpl (%rdi) 8: 84 a4 01 00 00 e8 ce test %ah,-0x31180000(%rcx,%rax,1) f: 7f b5 jg 0xffffffc6 11: ff 49 8d decl -0x73(%rcx) 14: be 00 4e 00 00 mov $0x4e00,%esi 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 74 08 je 0x3a 32: 3c 03 cmp $0x3,%al 34: 0f 8e 10 02 00 00 jle 0x24a 3a: 4d rex.WRB 3b: 63 .byte 0x63 3c: ae scas %es:(%rdi),%al 3d: 00 4e 00 add %cl,0x0(%rsi) Tested on: commit: 37bb2e72 Merge tag 'staging-6.19-rc1' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13dcf21a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=dbcb767d1e1208ac dashboard link: https://syzkaller.appspot.com/bug?extid=e008db2ac01e282550ee compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=14f5a992580000
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