MINIX-fs: mounting unchecked file system, running fsck is recommended ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_write include/linux/instrumented.h:71 [inline] BUG: KASAN: null-ptr-deref in test_and_set_bit_lock include/asm-generic/bitops/instrumented-lock.h:55 [inline] BUG: KASAN: null-ptr-deref in trylock_buffer include/linux/buffer_head.h:359 [inline] BUG: KASAN: null-ptr-deref in lock_buffer include/linux/buffer_head.h:365 [inline] BUG: KASAN: null-ptr-deref in alloc_branch fs/minix/itree_common.c:88 [inline] BUG: KASAN: null-ptr-deref in get_block+0x657/0x1380 fs/minix/itree_common.c:191 Write of size 8 at addr 0000000000000000 by task syz-executor801/7039 CPU: 0 PID: 7039 Comm: syz-executor801 Not tainted 5.7.0-rc1-next-20200414-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+0x188/0x20d lib/dump_stack.c:118 __kasan_report.cold+0x5/0x4d mm/kasan/report.c:515 kasan_report+0x33/0x50 mm/kasan/common.c:625 check_memory_region_inline mm/kasan/generic.c:187 [inline] check_memory_region+0x141/0x190 mm/kasan/generic.c:193 instrument_atomic_write include/linux/instrumented.h:71 [inline] test_and_set_bit_lock include/asm-generic/bitops/instrumented-lock.h:55 [inline] trylock_buffer include/linux/buffer_head.h:359 [inline] lock_buffer include/linux/buffer_head.h:365 [inline] alloc_branch fs/minix/itree_common.c:88 [inline] get_block+0x657/0x1380 fs/minix/itree_common.c:191 minix_get_block+0xe5/0x110 fs/minix/inode.c:376 __block_write_begin_int+0x490/0x1b00 fs/buffer.c:2039 __block_write_begin fs/buffer.c:2089 [inline] block_write_begin+0x58/0x2e0 fs/buffer.c:2148 minix_write_begin+0x35/0xe0 fs/minix/inode.c:412 generic_perform_write+0x20a/0x4e0 mm/filemap.c:3308 __generic_file_write_iter+0x24c/0x610 mm/filemap.c:3437 generic_file_write_iter+0x3f3/0x630 mm/filemap.c:3469 call_write_iter include/linux/fs.h:1907 [inline] new_sync_write+0x4a2/0x700 fs/read_write.c:484 __vfs_write+0xc9/0x100 fs/read_write.c:497 vfs_write+0x268/0x5d0 fs/read_write.c:559 ksys_write+0x12d/0x250 fs/read_write.c:612 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x444c19 Code: 0d d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 db d7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fff24751328 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fff24751330 RCX: 0000000000444c19 RDX: 00000000ffffff2e RSI: 0000000020000040 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000401000 R09: 0000000000401000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402880 R13: 0000000000402910 R14: 0000000000000000 R15: 0000000000000000 ==================================================================