================================================================== 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.5.2394/28085 CPU: 1 UID: 0 PID: 28085 Comm: syz.5.2394 Not tainted 6.17.0-rc1-syzkaller-00224-g8d561baae505 #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 try_charge mm/memcontrol.c:2499 [inline] charge_memcg+0x9f/0x180 mm/memcontrol.c:4702 __mem_cgroup_charge+0x25/0x80 mm/memcontrol.c:4719 mem_cgroup_charge include/linux/memcontrol.h:654 [inline] filemap_add_folio+0x49/0x270 mm/filemap.c:964 ra_alloc_folio mm/readahead.c:448 [inline] page_cache_ra_order+0x643/0xd40 mm/readahead.c:506 filemap_readahead mm/filemap.c:2572 [inline] filemap_get_pages+0xb22/0x1ea0 mm/filemap.c:2617 filemap_splice_read+0x581/0xc60 mm/filemap.c:2991 do_splice_read fs/splice.c:979 [inline] splice_direct_to_actor+0x4a9/0xcc0 fs/splice.c:1083 do_splice_direct_actor fs/splice.c:1201 [inline] do_splice_direct+0x181/0x270 fs/splice.c:1227 do_sendfile+0x4da/0x7e0 fs/read_write.c:1370 __do_sys_sendfile64 fs/read_write.c:1431 [inline] __se_sys_sendfile64+0x13e/0x190 fs/read_write.c:1417 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: 0033:0x7f6bc2d8ebe9 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:00007f6bc3c3c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f6bc2fb6180 RCX: 00007f6bc2d8ebe9 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000004 RBP: 00007f6bc2e11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020fffe82 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6bc2fb6218 R14: 00007f6bc2fb6180 R15: 00007ffc2beb56b8 ==================================================================