================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:68 [inline] BUG: KASAN: null-ptr-deref in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline] BUG: KASAN: null-ptr-deref in buffer_busy fs/buffer.c:2886 [inline] BUG: KASAN: null-ptr-deref in drop_buffers+0x65/0x4f0 fs/buffer.c:2898 Read of size 4 at addr 0000000000000060 by task syz.2.8185/11616 CPU: 0 UID: 0 PID: 11616 Comm: syz.2.8185 Not tainted 6.17.0-rc1-syzkaller-00214-g99bade344cfa #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 kasan_report+0x118/0x150 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:68 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline] buffer_busy fs/buffer.c:2886 [inline] drop_buffers+0x65/0x4f0 fs/buffer.c:2898 try_to_free_buffers+0x1e1/0x2d0 fs/buffer.c:2952 shrink_folio_list+0x20ac/0x4cd0 mm/vmscan.c:1518 evict_folios+0x47f2/0x58b0 mm/vmscan.c:4744 try_to_shrink_lruvec+0x8a3/0xb50 mm/vmscan.c:4907 lru_gen_shrink_lruvec mm/vmscan.c:5056 [inline] shrink_lruvec+0x49c/0x2980 mm/vmscan.c:5815 shrink_node_memcgs mm/vmscan.c:6051 [inline] shrink_node+0xa4e/0x3760 mm/vmscan.c:6092 shrink_zones mm/vmscan.c:6336 [inline] do_try_to_free_pages+0x668/0x1960 mm/vmscan.c:6398 try_to_free_mem_cgroup_pages+0x2fa/0x7e0 mm/vmscan.c:6726 try_charge_memcg+0xa40/0x1290 mm/memcontrol.c:2357 obj_cgroup_charge_pages mm/memcontrol.c:2800 [inline] __memcg_kmem_charge_page+0xe1/0x240 mm/memcontrol.c:2844 __alloc_frozen_pages_noprof+0x1b5/0x370 mm/page_alloc.c:5165 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 ___kmalloc_large_node+0x5f/0x1b0 mm/slub.c:4306 __kmalloc_large_node_noprof+0x18/0x90 mm/slub.c:4337 __do_kmalloc_node mm/slub.c:4353 [inline] __kmalloc_node_track_caller_noprof+0x361/0x4e0 mm/slub.c:4384 __do_krealloc mm/slub.c:4942 [inline] krealloc_noprof+0x124/0x340 mm/slub.c:4995 copy_array+0x63/0xf0 kernel/bpf/verifier.c:1388 copy_reference_state kernel/bpf/verifier.c:1429 [inline] copy_verifier_state+0x330/0xf10 kernel/bpf/verifier.c:1752 is_state_visited kernel/bpf/verifier.c:19626 [inline] do_check+0x4017/0xe520 kernel/bpf/verifier.c:20026 do_check_common+0x1949/0x24f0 kernel/bpf/verifier.c:23260 do_check_main kernel/bpf/verifier.c:23343 [inline] bpf_check+0x1746a/0x1d2d0 kernel/bpf/verifier.c:24703 bpf_prog_load+0x1318/0x1930 kernel/bpf/syscall.c:2979 __sys_bpf+0x528/0x870 kernel/bpf/syscall.c:6029 __do_sys_bpf kernel/bpf/syscall.c:6139 [inline] __se_sys_bpf kernel/bpf/syscall.c:6137 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6137 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd99c58ebe9 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:00007fd99d397038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fd99c7b5fa0 RCX: 00007fd99c58ebe9 RDX: 0000000000000094 RSI: 0000200000000700 RDI: 0000000000000005 RBP: 00007fd99c611e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd99c7b6038 R14: 00007fd99c7b5fa0 R15: 00007ffe3dca3818 ==================================================================