attempt to access beyond end of device loop0: rw=0, want=6491538, limit=128 Buffer I/O error on dev loop0, logical block 3245768, async page read ------------[ cut here ]------------ WARNING: CPU: 0 PID: 4021 at fs/inode.c:364 inc_nlink+0x130/0x168 fs/inode.c:364 Modules linked in: CPU: 0 PID: 4021 Comm: syz-executor394 Not tainted 5.15.178-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : inc_nlink+0x130/0x168 fs/inode.c:364 lr : inc_nlink+0x130/0x168 fs/inode.c:364 sp : ffff80001d6a7b50 x29: ffff80001d6a7b50 x28: dfff800000000000 x27: 0000000000000000 x26: 1fffe0001950247a x25: ffff800011f12c88 x24: 00000000000001c0 x23: 1fffe0001bceb010 x22: dfff800000000000 x21: 0000000000000000 x20: ffff0000de758038 x19: ffff0000de758080 x18: 0000000000000000 x17: 00000000000001c0 x16: ffff800011b4da70 x15: 0000000000000000 x14: 00000000ffff8000 x13: 00000000f6c4c19a x12: 0000000000000001 x11: 0000000000000000 x10: 0000000000000000 x9 : ffff0000ca811b40 x8 : ffff8000089ea214 x7 : 0000000000000000 x6 : 000000000000003f x5 : 0000000000000040 x4 : 0000000000000000 x3 : 00000000000001c0 x2 : ffff0000dc1d0bc0 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: inc_nlink+0x130/0x168 fs/inode.c:364 inode_inc_link_count include/linux/fs.h:2499 [inline] sysv_mkdir+0x2c/0x138 fs/sysv/namei.c:119 vfs_mkdir+0x334/0x4e4 fs/namei.c:4065 do_mkdirat+0x20c/0x610 fs/namei.c:4090 __do_sys_mkdirat fs/namei.c:4105 [inline] __se_sys_mkdirat fs/namei.c:4103 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4103 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 irq event stamp: 14806 hardirqs last enabled at (14805): [] kasan_quarantine_put+0xdc/0x204 mm/kasan/quarantine.c:231 hardirqs last disabled at (14806): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396 softirqs last enabled at (14768): [] softirq_handle_end kernel/softirq.c:401 [inline] softirqs last enabled at (14768): [] handle_softirqs+0xb88/0xdbc kernel/softirq.c:586 softirqs last disabled at (14753): [] __do_softirq kernel/softirq.c:592 [inline] softirqs last disabled at (14753): [] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (14753): [] invoke_softirq kernel/softirq.c:439 [inline] softirqs last disabled at (14753): [] __irq_exit_rcu+0x268/0x4d8 kernel/softirq.c:641 ---[ end trace d6291d0f4a50f151 ]--- ================================================================== BUG: KASAN: use-after-free in sysv_new_block+0x618/0x7e4 fs/sysv/balloc.c:113 Read of size 4 at addr ffff00017578b0c8 by task syz-executor394/4021 CPU: 0 PID: 4021 Comm: syz-executor394 Tainted: G W 5.15.178-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x174/0x1e4 mm/kasan/report.c:451 __asan_report_load4_noabort+0x44/0x50 mm/kasan/report_generic.c:308 sysv_new_block+0x618/0x7e4 fs/sysv/balloc.c:113 alloc_branch fs/sysv/itree.c:134 [inline] get_block+0x258/0x1390 fs/sysv/itree.c:253 __block_write_begin_int+0x3ec/0x1608 fs/buffer.c:2012 __block_write_begin+0x40/0x54 fs/buffer.c:2062 sysv_prepare_chunk+0x3c/0x50 fs/sysv/itree.c:468 sysv_make_empty+0x98/0x4f8 fs/sysv/dir.c:257 sysv_mkdir+0x88/0x138 fs/sysv/namei.c:130 vfs_mkdir+0x334/0x4e4 fs/namei.c:4065 do_mkdirat+0x20c/0x610 fs/namei.c:4090 __do_sys_mkdirat fs/namei.c:4105 [inline] __se_sys_mkdirat fs/namei.c:4103 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4103 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 The buggy address belongs to the page: page:0000000011b5b901 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x1b578b flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000000 fffffc0005d5dbc8 fffffc0005d5e508 0000000000000000 raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff00017578af80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff00017578b000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff00017578b080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff00017578b100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff00017578b180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================