syzbot


WARNING in get_pte_pfn

Status: fixed on 2024/01/30 15:47
Subsystems: mm io-uring
[Documentation on labels]
Reported-by: syzbot+03fd9b3f71641f0ebf2d@syzkaller.appspotmail.com
Fix commit: c28ac3c7eb94 mm/mglru: skip special VMAs in lru_gen_look_around()
First crash: 164d, last: 150d
Cause bisection: failed (error log, bisect log)
  
Discussions (2)
Title Replies (including bot) Last reply
[syzbot] [mm?] [io-uring?] WARNING in get_pte_pfn 3 (5) 2023/12/23 04:59
[PATCH mm-unstable v1] mm/mglru: skip special VMAs in lru_gen_look_around() 1 (1) 2023/12/23 04:56
Last patch testing requests (3)
Created Duration User Patch Repo Result
2024/01/01 12:03 13m retest repro upstream report log
2024/01/01 11:50 13m retest repro upstream report log
2023/12/23 03:30 14m yuzhao@google.com patch upstream report log

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 5066 at mm/vmscan.c:3242 get_pte_pfn+0x1b5/0x3f0 mm/vmscan.c:3242
Modules linked in:
CPU: 1 PID: 5066 Comm: syz-executor668 Not tainted 6.7.0-rc5-syzkaller-00270-g0e389834672c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:get_pte_pfn+0x1b5/0x3f0 mm/vmscan.c:3242
Code: f3 74 2a e8 6d 78 cb ff 31 ff 48 b8 00 00 00 00 00 00 00 02 48 21 c5 48 89 ee e8 e6 73 cb ff 48 85 ed 74 4e e8 4c 78 cb ff 90 <0f> 0b 90 48 c7 c3 ff ff ff ff e8 3c 78 cb ff 48 b8 00 00 00 00 00
RSP: 0018:ffffc900041e6878 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 000000000007891d RCX: ffffffff81bbf6e3
RDX: ffff88807d813b80 RSI: ffffffff81bbf684 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000200 R11: 0000000000000003 R12: 0000000000000200
R13: 1ffff9200083cd0f R14: 0000000000010b21 R15: 0000000020ffc000
FS:  0000555555f4d480(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000005fbfa000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 lru_gen_look_around+0x70d/0x11a0 mm/vmscan.c:4001
 folio_referenced_one+0x5a2/0xf70 mm/rmap.c:843
 rmap_walk_anon+0x225/0x570 mm/rmap.c:2485
 rmap_walk mm/rmap.c:2562 [inline]
 rmap_walk mm/rmap.c:2557 [inline]
 folio_referenced+0x28a/0x4b0 mm/rmap.c:960
 folio_check_references mm/vmscan.c:829 [inline]
 shrink_folio_list+0x1ace/0x3f00 mm/vmscan.c:1160
 evict_folios+0x6e7/0x1b90 mm/vmscan.c:4499
 try_to_shrink_lruvec+0x638/0xa10 mm/vmscan.c:4704
 lru_gen_shrink_lruvec mm/vmscan.c:4849 [inline]
 shrink_lruvec+0x314/0x2990 mm/vmscan.c:5622
 shrink_node_memcgs mm/vmscan.c:5842 [inline]
 shrink_node+0x811/0x3710 mm/vmscan.c:5877
 shrink_zones mm/vmscan.c:6116 [inline]
 do_try_to_free_pages+0x36c/0x1940 mm/vmscan.c:6178
 try_to_free_mem_cgroup_pages+0x31a/0x770 mm/vmscan.c:6493
 try_charge_memcg+0x3d3/0x11f0 mm/memcontrol.c:2742
 obj_cgroup_charge_pages mm/memcontrol.c:3255 [inline]
 __memcg_kmem_charge_page+0xdd/0x2a0 mm/memcontrol.c:3281
 __alloc_pages+0x263/0x2420 mm/page_alloc.c:4585
 alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133
 __get_free_pages+0xc/0x40 mm/page_alloc.c:4615
 io_mem_alloc+0x33/0x60 io_uring/io_uring.c:2789
 io_allocate_scq_urings io_uring/io_uring.c:3842 [inline]
 io_uring_create io_uring/io_uring.c:4019 [inline]
 io_uring_setup+0x13ed/0x2430 io_uring/io_uring.c:4131
 __do_sys_io_uring_setup io_uring/io_uring.c:4158 [inline]
 __se_sys_io_uring_setup io_uring/io_uring.c:4152 [inline]
 __x64_sys_io_uring_setup+0x98/0x140 io_uring/io_uring.c:4152
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f4b0e4778a9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 1a 00 00 90 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:00007fff814fe868 EFLAGS: 00000202 ORIG_RAX: 00000000000001a9
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f4b0e4778a9
RDX: 0000000020000700 RSI: 0000000020000640 RDI: 0000000000005a19
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000020000700
R10: 00007fff814fe8d0 R11: 0000000000000202 R12: 0000000020000640
R13: 0000000000000000 R14: 0000000000005a19 R15: 0000000020000700
 </TASK>

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/12/18 08:46 upstream 0e389834672c 3222d10c .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in get_pte_pfn
2023/12/18 08:07 upstream 0e389834672c 3222d10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root WARNING in get_pte_pfn
* Struck through repros no longer work on HEAD.