================================================================== 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.0.6010/31840 CPU: 0 UID: 0 PID: 31840 Comm: syz.0.6010 Not tainted 6.17.0-rc2-syzkaller #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 shrink_one+0x21b/0x7c0 mm/vmscan.c:4952 shrink_many mm/vmscan.c:5015 [inline] lru_gen_shrink_node mm/vmscan.c:5093 [inline] shrink_node+0x314e/0x3760 mm/vmscan.c:6078 shrink_zones mm/vmscan.c:6336 [inline] do_try_to_free_pages+0x668/0x1960 mm/vmscan.c:6398 try_to_free_pages+0x8a2/0xdd0 mm/vmscan.c:6644 __perform_reclaim mm/page_alloc.c:4310 [inline] __alloc_pages_direct_reclaim+0x144/0x300 mm/page_alloc.c:4332 __alloc_pages_slowpath+0x5ff/0xce0 mm/page_alloc.c:4781 __alloc_frozen_pages_noprof+0x319/0x370 mm/page_alloc.c:5161 alloc_pages_mpol+0x1dc/0x4a0 mm/mempolicy.c:2402 folio_alloc_mpol_noprof mm/mempolicy.c:2435 [inline] alloc_migration_target_by_mpol+0x2e6/0x590 mm/mempolicy.c:1388 migrate_folio_unmap mm/migrate.c:1189 [inline] migrate_pages_batch+0x81e/0x3620 mm/migrate.c:1851 migrate_pages_sync mm/migrate.c:2001 [inline] migrate_pages+0x2038/0x2930 mm/migrate.c:2083 do_mbind mm/mempolicy.c:1539 [inline] kernel_mbind mm/mempolicy.c:1682 [inline] __do_sys_mbind mm/mempolicy.c:1756 [inline] __se_sys_mbind+0xa3e/0xc30 mm/mempolicy.c:1752 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: 0033:0x7ff46238ebe9 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:00007ff463259038 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed RAX: ffffffffffffffda RBX: 00007ff4625b6090 RCX: 00007ff46238ebe9 RDX: 0000000000000000 RSI: 0000000000800000 RDI: 0000200000001000 RBP: 00007ff462411e19 R08: 0000000000000000 R09: 0000000000000002 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff4625b6128 R14: 00007ff4625b6090 R15: 00007ffedfee1658 ==================================================================