EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback.
ext4 filesystem being mounted at /0/bus supports timestamps until 2038-01-19 (0x7fffffff)
==================================================================
BUG: KASAN: slab-out-of-bounds in ext4_inode_journal_mode+0x7b/0x480 fs/ext4/ext4_jbd2.c:12
Read of size 8 at addr ffff88801cefc378 by task syz.0.17/5984

CPU: 0 UID: 0 PID: 5984 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x240 mm/kasan/report.c:482
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 ext4_inode_journal_mode+0x7b/0x480 fs/ext4/ext4_jbd2.c:12
 ext4_should_journal_data fs/ext4/ext4_jbd2.h:381 [inline]
 mext_check_validity fs/ext4/move_extent.c:426 [inline]
 ext4_move_extents+0x2bb/0x3630 fs/ext4/move_extent.c:579
 __ext4_ioctl fs/ext4/ioctl.c:1356 [inline]
 ext4_ioctl+0x26a7/0x33c0 fs/ext4/ioctl.c:1616
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:598 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:584
 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: 0033:0x7f6a6678ec29
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:00007ffea3688b38 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6a669d5fa0 RCX: 00007f6a6678ec29
RDX: 0000200000000040 RSI: 00000000c028660f RDI: 0000000000000004
RBP: 00007f6a66811e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6a669d5fa0 R14: 00007f6a669d5fa0 R15: 0000000000000003
 </TASK>

Allocated by task 1:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:388 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:405
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4407
 kmalloc_noprof include/linux/slab.h:905 [inline]
 kzalloc_noprof include/linux/slab.h:1039 [inline]
 shmem_fill_super+0xc8/0x1190 mm/shmem.c:5059
 vfs_get_super fs/super.c:1325 [inline]
 get_tree_nodev+0xbb/0x150 fs/super.c:1344
 vfs_get_tree+0x92/0x2b0 fs/super.c:1815
 fc_mount fs/namespace.c:1247 [inline]
 vfs_kern_mount+0xbe/0x160 fs/namespace.c:1286
 devtmpfs_init+0x98/0x330 drivers/base/devtmpfs.c:484
 driver_init+0x15/0x60 drivers/base/init.c:25
 do_basic_setup+0xf/0x70 init/main.c:1363
 kernel_init_freeable+0x334/0x4b0 init/main.c:1579
 kernel_init+0x1d/0x1d0 init/main.c:1469
 ret_from_fork+0x439/0x7d0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff88801cefc000
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 544 bytes to the right of
 allocated 344-byte region [ffff88801cefc000, ffff88801cefc158)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1cefc
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801a441c80 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801a441c80 dead000000000122 0000000000000000
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea000073bf01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 1877776345, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
 alloc_slab_page mm/slub.c:2492 [inline]
 allocate_slab+0x8a/0x370 mm/slub.c:2660
 new_slab mm/slub.c:2714 [inline]
 ___slab_alloc+0xbeb/0x1420 mm/slub.c:3901
 __slab_alloc mm/slub.c:3992 [inline]
 __slab_alloc_node mm/slub.c:4067 [inline]
 slab_alloc_node mm/slub.c:4228 [inline]
 __kmalloc_cache_noprof+0x296/0x3d0 mm/slub.c:4402
 kmalloc_noprof include/linux/slab.h:905 [inline]
 kzalloc_noprof include/linux/slab.h:1039 [inline]
 shmem_fill_super+0xc8/0x1190 mm/shmem.c:5059
 vfs_get_super fs/super.c:1325 [inline]
 get_tree_nodev+0xbb/0x150 fs/super.c:1344
 vfs_get_tree+0x92/0x2b0 fs/super.c:1815
 fc_mount fs/namespace.c:1247 [inline]
 vfs_kern_mount+0xbe/0x160 fs/namespace.c:1286
 devtmpfs_init+0x98/0x330 drivers/base/devtmpfs.c:484
 driver_init+0x15/0x60 drivers/base/init.c:25
 do_basic_setup+0xf/0x70 init/main.c:1363
 kernel_init_freeable+0x334/0x4b0 init/main.c:1579
 kernel_init+0x1d/0x1d0 init/main.c:1469
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88801cefc200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801cefc280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88801cefc300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                                ^
 ffff88801cefc380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88801cefc400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================