syzbot


WARNING in lru_gen_look_around (2)

Status: upstream: reported C repro on 2025/05/26 12:28
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+68f30a5d113386f5a4e3@syzkaller.appspotmail.com
First crash: 54d, last: 53d
Bug presence (2)
Date Name Commit Repro Result
2025/05/27 linux-6.1.y (ToT) da3c5173c55f C [report] WARNING in lru_gen_look_around
2025/05/27 upstream (ToT) 785cdec46e92 C Didn't crash
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in lru_gen_look_around -1 1 454d 454d 0/3 auto-obsoleted due to no activity on 2024/07/30 05:36
Fix bisection attempts (1)
Created Duration User Patch Repo Result
2025/06/22 13:37 29m fix candidate upstream error job log

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 4299 at mm/vmscan.c:3839 get_pte_pfn mm/vmscan.c:3839 [inline]
WARNING: CPU: 1 PID: 4299 at mm/vmscan.c:3839 lru_gen_look_around+0xb74/0x1330 mm/vmscan.c:4663
Modules linked in:
CPU: 1 PID: 4299 Comm: syz-executor178 Not tainted 6.1.140-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : get_pte_pfn mm/vmscan.c:3839 [inline]
pc : lru_gen_look_around+0xb74/0x1330 mm/vmscan.c:4663
lr : get_pte_pfn mm/vmscan.c:3839 [inline]
lr : lru_gen_look_around+0xb74/0x1330 mm/vmscan.c:4663
sp : ffff800020cb5290
x29: ffff800020cb5320 x28: 0000000020040000 x27: 0160000125001fc3
x26: ffff0000de1c1000 x25: ffff0000d5f52000 x24: 0000000000125001
x23: ffff0000de1c1008 x22: 0100000000000000 x21: 1fffe0001bc38201
x20: dfff800000000000 x19: 0000000020001000 x18: 0000000000000000
x17: ffff8000181a0000 x16: ffff8000082d076c x15: 0000000000000000
x14: 00000000ffffffff x13: 1ffff00002a0e0b1 x12: 0000000000ff0100
x11: ff00800008728cd8 x10: 0000000000000000 x9 : ffff800008728cd8
x8 : ffff0000d1fc0000 x7 : ffff800008737f50 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800008728be0
x2 : 0000000000000001 x1 : 0100000000000000 x0 : 0000000000000000
Call trace:
 get_pte_pfn mm/vmscan.c:3839 [inline]
 lru_gen_look_around+0xb74/0x1330 mm/vmscan.c:4663
 folio_referenced_one+0x368/0x9b4 mm/rmap.c:828
 rmap_walk_anon+0x348/0x4d4 mm/rmap.c:2451
 rmap_walk mm/rmap.c:2527 [inline]
 folio_referenced+0x2dc/0x3e8 mm/rmap.c:933
 folio_check_references mm/vmscan.c:1463 [inline]
 shrink_folio_list+0xb20/0x4448 mm/vmscan.c:1796
 evict_folios+0x387c/0x49d0 mm/vmscan.c:5046
 lru_gen_shrink_lruvec mm/vmscan.c:5229 [inline]
 shrink_lruvec+0x958/0x34e4 mm/vmscan.c:5924
 shrink_node_memcgs mm/vmscan.c:6145 [inline]
 shrink_node+0x52c/0x20ac mm/vmscan.c:6176
 shrink_zones mm/vmscan.c:6417 [inline]
 do_try_to_free_pages+0x550/0x144c mm/vmscan.c:6479
 try_to_free_mem_cgroup_pages+0x2d8/0xa50 mm/vmscan.c:6794
 try_charge_memcg+0x48c/0x1448 mm/memcontrol.c:2686
 obj_cgroup_charge_pages mm/memcontrol.c:3101 [inline]
 __memcg_kmem_charge_page+0x304/0x54c mm/memcontrol.c:3127
 __alloc_pages+0x1fc/0x53c mm/page_alloc.c:5623
 alloc_pages+0x434/0x6f8 mm/mempolicy.c:-1
 vm_area_alloc_pages mm/vmalloc.c:2994 [inline]
 __vmalloc_area_node mm/vmalloc.c:3063 [inline]
 __vmalloc_node_range+0x734/0xe48 mm/vmalloc.c:3235
 kvmalloc_node+0x168/0x1dc mm/util.c:606
 kvmalloc include/linux/slab.h:716 [inline]
 kvzalloc include/linux/slab.h:724 [inline]
 ip_set_alloc+0x2c/0x3c net/netfilter/ipset/ip_set_core.c:261
 hash_netiface_create+0x2c4/0xcb8 net/netfilter/ipset/ip_set_hash_gen.h:1515
 ip_set_create+0x48c/0x1024 net/netfilter/ipset/ip_set_core.c:1111
 nfnetlink_rcv_msg+0x9d4/0xed8 net/netfilter/nfnetlink.c:302
 netlink_rcv_skb+0x208/0x3c4 net/netlink/af_netlink.c:2493
 nfnetlink_rcv+0x1f8/0x1afc net/netfilter/nfnetlink.c:659
 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
 netlink_unicast+0x600/0x818 net/netlink/af_netlink.c:1337
 netlink_sendmsg+0x6e8/0x9b0 net/netlink/af_netlink.c:1859
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x5b8/0x918 net/socket.c:2519
 ___sys_sendmsg net/socket.c:2573 [inline]
 __sys_sendmsg+0x25c/0x320 net/socket.c:2602
 __do_sys_sendmsg net/socket.c:2611 [inline]
 __se_sys_sendmsg net/socket.c:2609 [inline]
 __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2609
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
irq event stamp: 534280
hardirqs last  enabled at (534279): [<ffff800008723098>] count_memcg_events include/linux/memcontrol.h:1066 [inline]
hardirqs last  enabled at (534279): [<ffff800008723098>] count_memcg_folio_events include/linux/memcontrol.h:1084 [inline]
hardirqs last  enabled at (534279): [<ffff800008723098>] shrink_folio_list+0x10b8/0x4448 mm/vmscan.c:2078
hardirqs last disabled at (534280): [<ffff8000119153e0>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (522406): [<ffff8000081a8dc0>] softirq_handle_end kernel/softirq.c:421 [inline]
softirqs last  enabled at (522406): [<ffff8000081a8dc0>] handle_softirqs+0xaf8/0xc6c kernel/softirq.c:606
softirqs last disabled at (522401): [<ffff800008020164>] __do_softirq+0x14/0x20 kernel/softirq.c:612
---[ end trace 0000000000000000 ]---
syz-executor178 invoked oom-killer: gfp_mask=0x402dc2(GFP_KERNEL_ACCOUNT|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_ZERO), order=0, oom_score_adj=1000
CPU: 1 PID: 4299 Comm: syz-executor178 Tainted: G        W          6.1.140-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 dump_header+0xc0/0x724 mm/oom_kill.c:467
 oom_kill_process+0x360/0x674 mm/oom_kill.c:1046
 out_of_memory+0xc5c/0xf68 mm/oom_kill.c:1184
 mem_cgroup_out_of_memory+0x210/0x2bc mm/memcontrol.c:1711
 mem_cgroup_oom mm/memcontrol.c:1941 [inline]
 try_charge_memcg+0xac4/0x1448 mm/memcontrol.c:2734
 obj_cgroup_charge_pages mm/memcontrol.c:3101 [inline]
 __memcg_kmem_charge_page+0x304/0x54c mm/memcontrol.c:3127
 __alloc_pages+0x1fc/0x53c mm/page_alloc.c:5623
 alloc_pages+0x434/0x6f8 mm/mempolicy.c:-1
 vm_area_alloc_pages mm/vmalloc.c:2994 [inline]
 __vmalloc_area_node mm/vmalloc.c:3063 [inline]
 __vmalloc_node_range+0x734/0xe48 mm/vmalloc.c:3235
 kvmalloc_node+0x168/0x1dc mm/util.c:606
 kvmalloc include/linux/slab.h:716 [inline]
 kvzalloc include/linux/slab.h:724 [inline]
 ip_set_alloc+0x2c/0x3c net/netfilter/ipset/ip_set_core.c:261
 hash_netiface_create+0x2c4/0xcb8 net/netfilter/ipset/ip_set_hash_gen.h:1515
 ip_set_create+0x48c/0x1024 net/netfilter/ipset/ip_set_core.c:1111
 nfnetlink_rcv_msg+0x9d4/0xed8 net/netfilter/nfnetlink.c:302
 netlink_rcv_skb+0x208/0x3c4 net/netlink/af_netlink.c:2493
 nfnetlink_rcv+0x1f8/0x1afc net/netfilter/nfnetlink.c:659
 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
 netlink_unicast+0x600/0x818 net/netlink/af_netlink.c:1337
 netlink_sendmsg+0x6e8/0x9b0 net/netlink/af_netlink.c:1859
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x5b8/0x918 net/socket.c:2519
 ___sys_sendmsg net/socket.c:2573 [inline]
 __sys_sendmsg+0x25c/0x320 net/socket.c:2602
 __do_sys_sendmsg net/socket.c:2611 [inline]
 __se_sys_sendmsg net/socket.c:2609 [inline]
 __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2609
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
memory: usage 307200kB, limit 307200kB, failcnt 89
memory+swap: usage 307228kB, limit 9007199254740988kB, failcnt 0
kmem: usage 307196kB, limit 9007199254740988kB, failcnt 0
Memory cgroup stats for /syz0:
anon 0
file 0
kernel 314568704
kernel_stack 32768
pagetables 36864
sec_pagetables 0
percpu 0
sock 0
vmalloc 0
shmem 0
zswap 0
zswapped 0
file_mapped 0
file_dirty 0
file_writeback 0
swapcached 28672
anon_thp 0
file_thp 0
shmem_thp 0
inactive_anon 0
active_anon 0
inactive_file 0
active_file 0
unevictable 0
slab_reclaimable 14120
slab_unreclaimable 31024
slab 45144
Tasks state (memory values in pages):
[  pid  ]   uid  tgid total_vm      rss pgtables_bytes swapents oom_score_adj name
[   4298]     0  4298     4324       13    32768        1             0 syz-executor178
[   4299]     0  4299     4324      104    49152        6          1000 syz-executor178
oom-kill:constraint=CONSTRAINT_MEMCG,nodemask=(null),cpuset=syz0,mems_allowed=0,oom_memcg=/syz0,task_memcg=/syz0,task=syz-executor178,pid=4299,uid=0
Memory cgroup out of memory: Killed process 4299 (syz-executor178) total-vm:17296kB, anon-rss:32kB, file-rss:384kB, shmem-rss:0kB, UID:0 pgtables:48kB oom_score_adj:1000

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/05/26 14:46 linux-6.1.y da3c5173c55f 2d4582d0 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in lru_gen_look_around
2025/05/26 13:34 linux-6.1.y da3c5173c55f 2d4582d0 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in lru_gen_look_around
2025/05/26 12:28 linux-6.1.y da3c5173c55f 2d4582d0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in lru_gen_look_around
2025/05/26 12:27 linux-6.1.y da3c5173c55f 2d4582d0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in lru_gen_look_around
* Struck through repros no longer work on HEAD.