syzbot

iso9660: Unknown parameter '
%';ŗŖ™!ˆ²5†ŠPq¤“ĘėŗB«€œ‰r)š18446744073709551615’0xffffffffffffffff'
FAT-fs (loop1): error, fat_get_cluster: invalid start cluster (i_pos 1, start 00000101)
==================================================================
BUG: KCSAN: data-race in __lru_add_drain_all / folios_put_refs

write to 0xffff888237d26668 of 1 bytes by task 16571 on cpu 1:
 folio_batch_reinit include/linux/pagevec.h:50 [inline]
 folios_put_refs+0x285/0x2d0 mm/swap.c:996
 folios_put include/linux/mm.h:1876 [inline]
 folio_batch_move_lru+0x247/0x270 mm/swap.c:179
 __folio_batch_add_and_move mm/swap.c:196 [inline]
 folio_add_lru+0x149/0x1e0 mm/swap.c:511
 shmem_alloc_and_add_folio mm/shmem.c:2031 [inline]
 shmem_get_folio_gfp+0x7b0/0xd60 mm/shmem.c:2567
 shmem_fault+0xf6/0x250 mm/shmem.c:2768
 __do_fault+0xbc/0x200 mm/memory.c:5363
 do_read_fault mm/memory.c:5798 [inline]
 do_fault mm/memory.c:5932 [inline]
 do_pte_missing mm/memory.c:4477 [inline]
 handle_pte_fault mm/memory.c:6316 [inline]
 __handle_mm_fault mm/memory.c:6454 [inline]
 handle_mm_fault+0x11d7/0x3020 mm/memory.c:6623
 faultin_page mm/gup.c:1126 [inline]
 __get_user_pages+0x1023/0x1ea0 mm/gup.c:1428
 populate_vma_page_range mm/gup.c:1860 [inline]
 __mm_populate+0x242/0x390 mm/gup.c:1963
 mm_populate include/linux/mm.h:3899 [inline]
 vm_mmap_pgoff+0x23b/0x2d0 mm/util.c:586
 ksys_mmap_pgoff+0xc1/0x310 mm/mmap.c:605
 x64_sys_call+0x14df/0x3020 arch/x86/include/generated/asm/syscalls_64.h:10
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888237d26668 of 1 bytes by task 16576 on cpu 0:
 folio_batch_count include/linux/pagevec.h:56 [inline]
 cpu_needs_drain mm/swap.c:780 [inline]
 __lru_add_drain_all+0x17e/0x450 mm/swap.c:877
 lru_cache_disable+0x1f/0x30 mm/swap.c:930
 do_migrate_pages+0x3a/0x640 mm/mempolicy.c:1337
 kernel_migrate_pages mm/mempolicy.c:1926 [inline]
 __do_sys_migrate_pages mm/mempolicy.c:1944 [inline]
 __se_sys_migrate_pages+0x780/0x840 mm/mempolicy.c:1940
 __x64_sys_migrate_pages+0x55/0x70 mm/mempolicy.c:1940
 x64_sys_call+0x2983/0x3020 arch/x86/include/generated/asm/syscalls_64.h:257
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x370 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x01 -> 0x00

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 16576 Comm: syz.1.2513 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
==================================================================