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BUG: KASAN: slab-use-after-free in jfs_lazycommit+0x771/0xac0
Read of size 4 at addr ffff8881a4deec94 by task jfsCommit/126

CPU: 1 UID: 0 PID: 126 Comm: jfsCommit 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+0xe8/0x150
 print_address_description+0x55/0x1e0
 print_report+0x58/0x70
 kasan_report+0x117/0x150
 jfs_lazycommit+0x771/0xac0
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Allocated by task 25824:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x321/0x600
 jfs_fill_super+0xc2/0xda0
 get_tree_bdev_flags+0x430/0x4f0
 vfs_get_tree+0x92/0x2a0
 do_new_mount+0x319/0xdc0
 __se_sys_mount+0x31d/0x420
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 10931:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x40/0x50
 __kasan_slab_free+0x5c/0x80
 kfree+0x1c5/0x650
 generic_shutdown_super+0x13d/0x2d0
 kill_block_super+0x44/0xa0
 deactivate_locked_super+0xbc/0x110
 cleanup_mnt+0x3d3/0x460
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0x204/0x770
 do_syscall_64+0x328/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff8881a4deec00
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 148 bytes inside of
 freed 256-byte region [ffff8881a4deec00, ffff8881a4deed00)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1a4dee
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000040 ffff888100041b40 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 057ff00000000040 ffff888100041b40 dead000000000100 dead000000000122
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 057ff00000000001 ffffffffffffff81 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 22380, tgid 22379 (syz.5.6328), ts 592447164048
 post_alloc_hook+0x1f9/0x250
 get_page_from_freelist+0x2209/0x2280
 __alloc_frozen_pages_noprof+0x217/0x5a0
 allocate_slab+0x7d/0x620
 refill_objects+0x2d5/0x350
 __pcs_replace_empty_main+0x2c8/0x6c0
 __kmalloc_noprof+0x47b/0x720
 hash_ipportnet6_add+0x2608/0x3290
 hash_ipportnet6_uadt+0xa57/0xde0
 call_ad+0x365/0xb50
 ip_set_ad+0x82a/0x9d0
 nfnetlink_rcv_msg+0xcc2/0x12b0
 netlink_rcv_skb+0x226/0x4a0
 nfnetlink_rcv+0x2b9/0x28c0
 netlink_unicast+0x7bd/0x940
 netlink_sendmsg+0x813/0xb40
page last free pid 22349 tgid 22346 ts 591153187348 stack trace:
 __free_frozen_pages+0xc93/0xd90
 rcu_core+0x926/0x1260
 handle_softirqs+0x226/0x860
 __irq_exit_rcu+0xcb/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 asm_sysvec_apic_timer_interrupt+0x1a/0x20

Memory state around the buggy address:
 ffff8881a4deeb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881a4deec00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881a4deec80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff8881a4deed00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881a4deed80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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