blkno = 7400766461, nblocks = 61625f
ERROR: (device loop3): dbUpdatePMap: blocks are outside the map
==================================================================
BUG: KASAN: slab-out-of-bounds in txAllocPMap+0x448/0x5d4 fs/jfs/jfs_txnmgr.c:2412
Read of size 1 at addr ffff0000cff79010 by task jfsCommit/94

CPU: 1 PID: 94 Comm: jfsCommit Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call trace:
 dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 print_address_description+0x88/0x218 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:420
 kasan_report+0xa8/0xfc mm/kasan/report.c:524
 __asan_report_load1_noabort+0x2c/0x38 mm/kasan/report_generic.c:348
 txAllocPMap+0x448/0x5d4 fs/jfs/jfs_txnmgr.c:2412
 txUpdateMap+0x240/0x794 fs/jfs/jfs_txnmgr.c:2309
 txLazyCommit fs/jfs/jfs_txnmgr.c:2665 [inline]
 jfs_lazycommit+0x354/0x908 fs/jfs/jfs_txnmgr.c:2733
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850

Allocated by task 6179:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:53
 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:375 [inline]
 __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:384
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:936 [inline]
 __kmalloc_node_track_caller+0xe0/0x16c mm/slab_common.c:956
 kstrdup mm/util.c:61 [inline]
 kstrdup_const+0x90/0xdc mm/util.c:84
 __kernfs_new_node+0xb0/0x5f4 fs/kernfs/dir.c:610
 kernfs_new_node+0x11c/0x22c fs/kernfs/dir.c:690
 kernfs_create_dir_ns+0x58/0x12c fs/kernfs/dir.c:1046
 sysfs_create_dir_ns+0x120/0x264 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:63 [inline]
 kobject_add_internal+0x598/0xb08 lib/kobject.c:231
 kobject_add_varg lib/kobject.c:366 [inline]
 kobject_add+0x140/0x20c lib/kobject.c:418
 device_add+0x3f8/0xefc drivers/base/core.c:3632
 netdev_register_kobject+0x164/0x2e0 net/core/net-sysfs.c:2013
 register_netdevice+0xf1c/0x1614 net/core/dev.c:10243
 veth_newlink+0x490/0xaa0 drivers/net/veth.c:1725
 rtnl_newlink_create net/core/rtnetlink.c:3428 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3648 [inline]
 rtnl_newlink+0x1050/0x1a54 net/core/rtnetlink.c:3661
 rtnetlink_rcv_msg+0x698/0xcdc net/core/rtnetlink.c:6158
 netlink_rcv_skb+0x218/0x3e8 net/netlink/af_netlink.c:2511
 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6176
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x60c/0x814 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x6f4/0x9c0 net/netlink/af_netlink.c:1872
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 __sys_sendto+0x324/0x440 net/socket.c:2152
 __do_sys_sendto net/socket.c:2164 [inline]
 __se_sys_sendto net/socket.c:2160 [inline]
 __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2160
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

The buggy address belongs to the object at ffff0000cff79000
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 16 bytes inside of
 128-byte region [ffff0000cff79000, ffff0000cff79080)

The buggy address belongs to the physical page:
page:00000000a4271a1b refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10ff79
flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000200 0000000000000000 dead000000000122 ffff0000c0002300
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000cff78f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000cff78f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000cff79000: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                         ^
 ffff0000cff79080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000cff79100: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
blkno = 7400766461, nblocks = 61625f
ERROR: (device loop3): dbUpdatePMap: blocks are outside the map

blkno = 7461625f6f, nblocks = 5f3168
ERROR: (device loop3): dbUpdatePMap: blocks are outside the map