================================================================== 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:2882 [inline] BUG: KASAN: null-ptr-deref in drop_buffers+0x6f/0x710 fs/buffer.c:2894 Read of size 4 at addr 0000000000000060 by task syz-executor.2/18556 CPU: 0 PID: 18556 Comm: syz-executor.2 Not tainted 6.7.0-syzkaller-09928-g052d534373b7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_report+0xe6/0x540 mm/kasan/report.c:491 kasan_report+0x142/0x170 mm/kasan/report.c:601 kasan_check_range+0x27e/0x290 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:2882 [inline] drop_buffers+0x6f/0x710 fs/buffer.c:2894 try_to_free_buffers+0x295/0x5f0 fs/buffer.c:2924 shrink_folio_list+0x26f3/0x89c0 mm/vmscan.c:1369 shrink_inactive_list mm/vmscan.c:1914 [inline] shrink_list mm/vmscan.c:2155 [inline] shrink_lruvec+0x16e6/0x2d40 mm/vmscan.c:5681 shrink_node_memcgs mm/vmscan.c:5867 [inline] shrink_node+0x1191/0x28e0 mm/vmscan.c:5902 shrink_zones mm/vmscan.c:6141 [inline] do_try_to_free_pages+0x717/0x19e0 mm/vmscan.c:6203 try_to_free_mem_cgroup_pages+0x455/0xa70 mm/vmscan.c:6518 try_charge_memcg+0x6d8/0x18a0 mm/memcontrol.c:2762 try_charge mm/memcontrol.c:2904 [inline] charge_memcg+0xa2/0x160 mm/memcontrol.c:7241 __mem_cgroup_charge+0x27/0x80 mm/memcontrol.c:7256 mem_cgroup_charge include/linux/memcontrol.h:690 [inline] shmem_alloc_and_add_folio+0x393/0xde0 mm/shmem.c:1677 shmem_get_folio_gfp+0x7c3/0x1ee0 mm/shmem.c:2052 shmem_get_folio mm/shmem.c:2134 [inline] shmem_write_begin+0x170/0x4c0 mm/shmem.c:2717 generic_perform_write+0x31b/0x630 mm/filemap.c:3928 shmem_file_write_iter+0xfc/0x120 mm/shmem.c:2893 call_write_iter include/linux/fs.h:2085 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0x783/0xaf0 fs/read_write.c:590 ksys_write+0x1a0/0x2c0 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7fde2067baef Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 b9 80 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 0c 81 02 00 48 RSP: 002b:00007fde2144ae80 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000200000 RCX: 00007fde2067baef RDX: 0000000000200000 RSI: 00007fde16a00000 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000001ee43 R10: 0000000000003ffe R11: 0000000000000293 R12: 0000000000000003 R13: 00007fde2144af80 R14: 00007fde2144af40 R15: 00007fde16a00000 ==================================================================