MINIX-fs: mounting unchecked file system, running fsck is recommended
Process accounting resumed
==================================================================
BUG: KASAN: use-after-free in add_chain fs/minix/itree_common.c:14 [inline]
BUG: KASAN: use-after-free in get_branch fs/minix/itree_common.c:52 [inline]
BUG: KASAN: use-after-free in get_block+0x69a/0x1600 fs/minix/itree_common.c:160
Read of size 2 at addr ffff8880a929518a by task syz-executor093/6792

CPU: 1 PID: 6792 Comm: syz-executor093 Not tainted 5.8.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1f0/0x31e lib/dump_stack.c:118
 print_address_description+0x66/0x5a0 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report+0x132/0x1d0 mm/kasan/report.c:530
 add_chain fs/minix/itree_common.c:14 [inline]
 get_branch fs/minix/itree_common.c:52 [inline]
 get_block+0x69a/0x1600 fs/minix/itree_common.c:160
 __block_write_begin_int+0x708/0x1a00 fs/buffer.c:2012
 __block_write_begin fs/buffer.c:2062 [inline]
 block_write_begin+0x59/0x280 fs/buffer.c:2121
 minix_write_begin+0x38/0x1f0 fs/minix/inode.c:412
 generic_perform_write+0x23b/0x4e0 mm/filemap.c:3318
 __generic_file_write_iter+0x22b/0x4e0 mm/filemap.c:3447
 generic_file_write_iter+0x4a6/0x650 mm/filemap.c:3479
 call_write_iter include/linux/fs.h:1908 [inline]
 new_sync_write fs/read_write.c:503 [inline]
 __kernel_write+0x85b/0xa60 fs/read_write.c:530
 do_acct_process+0xec6/0x12b0 kernel/acct.c:522
 slow_acct_process kernel/acct.c:581 [inline]
 acct_process+0x398/0x4a0 kernel/acct.c:607
 do_exit+0x593/0x1f80 kernel/exit.c:795
 do_group_exit+0x161/0x2d0 kernel/exit.c:903
 __do_sys_exit_group+0x13/0x20 kernel/exit.c:914
 __se_sys_exit_group+0x10/0x10 kernel/exit.c:912
 __x64_sys_exit_group+0x37/0x40 kernel/exit.c:912
 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x444fa8
Code: Bad RIP value.
RSP: 002b:00007ffdf96d70e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000444fa8
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00000000004c74d0 R08: 00000000000000e7 R09: ffffffffffffffd4
R10: 00007ffdf96d7000 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000006da5e0 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 6750:
 save_stack mm/kasan/common.c:48 [inline]
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc+0x103/0x140 mm/kasan/common.c:494
 slab_post_alloc_hook mm/slab.h:586 [inline]
 slab_alloc mm/slab.c:3320 [inline]
 kmem_cache_alloc+0x1f5/0x2d0 mm/slab.c:3484
 vm_area_dup kernel/fork.c:359 [inline]
 dup_mmap+0x53c/0xd60 kernel/fork.c:548
 dup_mm+0x98/0x320 kernel/fork.c:1371
 copy_mm kernel/fork.c:1427 [inline]
 copy_process+0x1fa5/0x52f0 kernel/fork.c:2098
 _do_fork+0x134/0x650 kernel/fork.c:2443
 __do_sys_clone kernel/fork.c:2599 [inline]
 __se_sys_clone kernel/fork.c:2580 [inline]
 __x64_sys_clone+0x21c/0x260 kernel/fork.c:2580
 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 6756:
 save_stack mm/kasan/common.c:48 [inline]
 set_track mm/kasan/common.c:56 [inline]
 kasan_set_free_info mm/kasan/common.c:316 [inline]
 __kasan_slab_free+0x114/0x170 mm/kasan/common.c:455
 __cache_free mm/slab.c:3426 [inline]
 kmem_cache_free+0x7e/0xf0 mm/slab.c:3694
 remove_vma mm/mmap.c:184 [inline]
 exit_mmap+0x44d/0x530 mm/mmap.c:3161
 __mmput+0x113/0x370 kernel/fork.c:1093
 exec_mmap fs/exec.c:1119 [inline]
 begin_new_exec+0xa53/0x15c0 fs/exec.c:1365
 load_elf_binary+0x60f/0x48a0 fs/binfmt_elf.c:974
 search_binary_handler fs/exec.c:1749 [inline]
 exec_binprm fs/exec.c:1790 [inline]
 __do_execve_file+0x1550/0x2310 fs/exec.c:1926
 do_execveat_common fs/exec.c:1980 [inline]
 do_execve fs/exec.c:1997 [inline]
 __do_sys_execve fs/exec.c:2073 [inline]
 __se_sys_execve fs/exec.c:2068 [inline]
 __x64_sys_execve+0x90/0xa0 fs/exec.c:2068
 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff8880a9295148
 which belongs to the cache vm_area_struct of size 200
The buggy address is located 66 bytes inside of
 200-byte region [ffff8880a9295148, ffff8880a9295210)
The buggy address belongs to the page:
page:ffffea0002a4a540 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea0002484548 ffffea00028a7088 ffff8880aa5d5700
raw: 0000000000000000 ffff8880a9295040 000000010000000f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a9295080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880a9295100: fb fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb
>ffff8880a9295180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff8880a9295200: fb fb fc fc fc fc fc fc fc fc fb fb fb fb fb fb
 ffff8880a9295280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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