BUG: spinlock bad magic on CPU#0, jfsCommit/124
==================================================================
BUG: KASAN: slab-use-after-free in string+0x231/0x2b0
Read of size 1 at addr ffff8881b45792b0 by task jfsCommit/124

CPU: 0 UID: 0 PID: 124 Comm: jfsCommit Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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+0xe8/0x150
 print_address_description+0x55/0x1e0
 print_report+0x58/0x70
 kasan_report+0x117/0x150
 string+0x231/0x2b0
 vsnprintf+0x739/0xee0
 vprintk_store+0x371/0xd50
 vprintk_emit+0x192/0x560
 _printk+0xdd/0x130
 spin_dump+0x101/0x1a0
 do_raw_spin_lock+0x1e5/0x2f0
 _raw_spin_lock_irqsave+0x4c/0x60
 __wake_up_common_lock+0x2f/0x1f0
 release_metapage+0x13d/0xaa0
 xtTruncate+0xecd/0x2f20
 jfs_free_zero_link+0x35b/0x4c0
 jfs_evict_inode+0x363/0x440
 evict+0x61e/0xb10
 jfs_lazycommit+0x43d/0xaa0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Allocated by task 7928:
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_lru_noprof+0x2b8/0x640
 jfs_alloc_inode+0x28/0x70
 alloc_inode+0x6a/0x1b0
 iget_locked+0x131/0x6a0
 jfs_iget+0x24/0x470
 jfs_fill_super+0x8ad/0xd80
 get_tree_bdev_flags+0x431/0x4f0
 vfs_get_tree+0x92/0x2a0
 do_new_mount+0x341/0xd30
 __se_sys_mount+0x31d/0x420
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 15:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5c/0x80
 kmem_cache_free+0x182/0x650
 rcu_core+0x7cd/0x1070
 handle_softirqs+0x22a/0x840
 run_ksoftirqd+0x36/0x60
 smpboot_thread_fn+0x541/0xa50
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30

Last potentially related work creation:
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 call_rcu+0xee/0x890
 evict+0x95b/0xb10
 evict_inodes+0x75a/0x7f0
 generic_shutdown_super+0xaa/0x2d0
 kill_block_super+0x44/0x90
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x437/0x4d0
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0xed/0x480
 do_syscall_64+0x33e/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff8881b45791c0
 which belongs to the cache jfs_ip of size 2144
The buggy address is located 240 bytes inside of
 freed 2144-byte region [ffff8881b45791c0, ffff8881b4579a20)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8881b457ac60 pfn:0x1b4578
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff8881b457fc41
flags: 0x57ff00000000240(workingset|head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000240 ffff88816044d640 ffff88816044cac8 ffffea0006d19210
raw: ffff8881b457ac60 00000008000e000c 00000000f5000000 ffff8881b457fc41
head: 057ff00000000240 ffff88816044d640 ffff88816044cac8 ffffea0006d19210
head: ffff8881b457ac60 00000008000e000c 00000000f5000000 ffff8881b457fc41
head: 057ff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Reclaimable, gfp_mask 0xd2050(__GFP_RECLAIMABLE|__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5784, tgid 5783 (syz.2.12), ts 66580450099, free_ts 24044916855
 post_alloc_hook+0x231/0x280
 get_page_from_freelist+0x24ba/0x2540
 __alloc_frozen_pages_noprof+0x18d/0x380
 allocate_slab+0x77/0x660
 refill_objects+0x339/0x3d0
 __pcs_replace_empty_main+0x321/0x720
 kmem_cache_alloc_lru_noprof+0x37c/0x640
 jfs_alloc_inode+0x28/0x70
 alloc_inode+0x6a/0x1b0
 new_inode+0x22/0x170
 jfs_fill_super+0x569/0xd80
 get_tree_bdev_flags+0x431/0x4f0
 vfs_get_tree+0x92/0x2a0
 do_new_mount+0x341/0xd30
 __se_sys_mount+0x31d/0x420
 do_syscall_64+0x15f/0xf80
page last free pid 1 tgid 1 stack trace:
 __free_frozen_pages+0xbc7/0xd30
 free_contig_range+0xb7/0x100
 destroy_args+0x4e5/0x570
 debug_vm_pgtable+0x3f8/0x410
 do_one_initcall+0x250/0x870
 do_initcall_level+0x104/0x190
 do_initcalls+0x59/0xa0
 kernel_init_freeable+0x2a6/0x3e0
 kernel_init+0x1d/0x1d0
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30

Memory state around the buggy address:
 ffff8881b4579180: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
 ffff8881b4579200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881b4579280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff8881b4579300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881b4579380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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