BTRFS info (device loop5): auto enabling async discard ================================================================== BUG: KASAN: stack-out-of-bounds in iterate_bvec include/linux/iov_iter.h:116 [inline] BUG: KASAN: stack-out-of-bounds in __copy_from_iter_mc+0x30a/0x3f0 lib/iov_iter.c:262 Read of size 4 at addr ffffc9000a0ff574 by task syz-executor.5/8451 CPU: 0 PID: 8451 Comm: syz-executor.5 Not tainted 6.6.0-rc3-next-20230929-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 iterate_bvec include/linux/iov_iter.h:116 [inline] __copy_from_iter_mc+0x30a/0x3f0 lib/iov_iter.c:262 __copy_from_iter lib/iov_iter.c:271 [inline] copy_page_from_iter_atomic+0x471/0x11e0 lib/iov_iter.c:504 btrfs_copy_from_user+0xe7/0x310 fs/btrfs/file.c:61 btrfs_buffered_write+0xabe/0x12d0 fs/btrfs/file.c:1337 btrfs_do_write_iter+0xa56/0x1120 fs/btrfs/file.c:1686 __kernel_write_iter+0x261/0x7e0 fs/read_write.c:517 dump_emit_page fs/coredump.c:888 [inline] dump_user_range+0x299/0x790 fs/coredump.c:915 elf_core_dump+0x2700/0x3900 fs/binfmt_elf.c:2142 do_coredump+0x2c97/0x3fc0 fs/coredump.c:764 get_signal+0x2434/0x2790 kernel/signal.c:2890 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x60 kernel/entry/common.c:296 do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f2fa447cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2fa51250c8 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffe5 RBX: 00007f2fa459bf80 RCX: 00007f2fa447cae9 RDX: 0000000100000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007f2fa44c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f2fa459bf80 R15: 00007ffd70b99bd8 The buggy address belongs to stack of task syz-executor.5/8451 and is located at offset 108 in frame: dump_user_range+0x0/0x790 fs/coredump.c:482 This frame has 3 objects: [48, 56) 'pos' [80, 96) 'bvec' [112, 152) 'iter' The buggy address belongs to the virtual mapping at [ffffc9000a0f8000, ffffc9000a101000) created by: kernel_clone+0xfd/0x920 kernel/fork.c:2902 The buggy address belongs to the physical page: page:ffffea0001fce280 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7f38a memcg:ffff8880291b7482 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff ffff8880291b7482 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO), pid 8450, tgid 8450 (syz-executor.5), ts 363006042687, free_ts 362824161389 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0x98f/0x32a0 mm/page_alloc.c:3333 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4589 alloc_pages+0x1a9/0x270 mm/mempolicy.c:2304 vm_area_alloc_pages mm/vmalloc.c:3063 [inline] __vmalloc_area_node mm/vmalloc.c:3139 [inline] __vmalloc_node_range+0x8f3/0x1bf0 mm/vmalloc.c:3320 alloc_thread_stack_node kernel/fork.c:309 [inline] dup_task_struct kernel/fork.c:1118 [inline] copy_process+0x13e3/0x74b0 kernel/fork.c:2327 kernel_clone+0xfd/0x920 kernel/fork.c:2902 __do_sys_clone3+0x1f1/0x260 kernel/fork.c:3203 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1134 [inline] free_unref_page_prepare+0x476/0xa40 mm/page_alloc.c:2383 free_unref_page_list+0xe6/0xb30 mm/page_alloc.c:2564 release_pages+0x32a/0x14e0 mm/swap.c:1042 __folio_batch_release+0x77/0xe0 mm/swap.c:1062 folio_batch_release include/linux/pagevec.h:83 [inline] mapping_try_invalidate+0x39a/0x480 mm/truncate.c:535 invalidate_bdev+0xb1/0xd0 block/bdev.c:87 btrfs_close_bdev+0x11a/0x170 fs/btrfs/volumes.c:1017 btrfs_close_one_device fs/btrfs/volumes.c:1041 [inline] close_fs_devices fs/btrfs/volumes.c:1086 [inline] close_fs_devices+0x200/0x980 fs/btrfs/volumes.c:1073 btrfs_close_devices+0x91/0x610 fs/btrfs/volumes.c:1102 btrfs_free_fs_info+0x4b/0x410 fs/btrfs/disk-io.c:1237 deactivate_locked_super+0xbc/0x1a0 fs/super.c:484 deactivate_super+0xde/0x100 fs/super.c:517 cleanup_mnt+0x222/0x3d0 fs/namespace.c:1256 task_work_run+0x14d/0x240 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x215/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x60 kernel/entry/common.c:296 Memory state around the buggy address: ffffc9000a0ff400: f1 f1 f1 00 00 00 00 00 00 f3 f3 f3 f3 00 00 00 ffffc9000a0ff480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc9000a0ff500: 00 f1 f1 f1 f1 f1 f1 00 f2 f2 f2 00 00 f2 f2 00 ^ ffffc9000a0ff580: 00 00 00 00 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 ffffc9000a0ff600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================