Buffer I/O error on dev loop7, logical block 3245768, async page read ------------[ cut here ]------------ WARNING: CPU: 1 PID: 7207 at fs/inode.c:389 inc_nlink+0x128/0x154 fs/inode.c:389 Modules linked in: CPU: 1 PID: 7207 Comm: syz.7.473 Not tainted 6.1.123-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : inc_nlink+0x128/0x154 fs/inode.c:389 lr : inc_nlink+0x128/0x154 fs/inode.c:389 sp : ffff800021767b70 x29: ffff800021767b70 x28: dfff800000000000 x27: 0000000000000000 x26: 1fffe0001b390815 x25: ffff800012714788 x24: 0000000000000000 x23: 1fffe0001c26e010 x22: dfff800000000000 x21: 0000000000000000 x20: ffff0000e1370038 x19: ffff0000e1370080 x18: ffff8000217673c0 x17: ffff800018b7b000 x16: ffff80001232c52c x15: 0000000000000002 x14: 00000000ffff8000 x13: 000000009aa47d42 x12: 0000000000080000 x11: 000000000001523c x10: ffff800023db9000 x9 : ffff800008aad48c x8 : 000000000001523d x7 : 0000000000000000 x6 : 000000000000003f x5 : 0000000000000040 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff0000e1351a70 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: inc_nlink+0x128/0x154 fs/inode.c:389 inode_inc_link_count include/linux/fs.h:2576 [inline] sysv_mkdir+0x2c/0x138 fs/sysv/namei.c:119 vfs_mkdir+0x334/0x4e4 fs/namei.c:4106 do_mkdirat+0x220/0x510 fs/namei.c:4131 __do_sys_mkdirat fs/namei.c:4146 [inline] __se_sys_mkdirat fs/namei.c:4144 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4144 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 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 irq event stamp: 6028 hardirqs last enabled at (6027): [] kasan_quarantine_put+0xdc/0x204 mm/kasan/quarantine.c:242 hardirqs last disabled at (6028): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (5910): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (5908): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- ================================================================== BUG: KASAN: use-after-free in sysv_new_block+0x618/0x7e4 fs/sysv/balloc.c:113 Read of size 4 at addr ffff0000f8e8b0c8 by task syz.7.473/7207 CPU: 1 PID: 7207 Comm: syz.7.473 Tainted: G W 6.1.123-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x174/0x4c0 mm/kasan/report.c:427 kasan_report+0xd4/0x130 mm/kasan/report.c:531 __asan_report_load4_noabort+0x2c/0x38 mm/kasan/report_generic.c:350 sysv_new_block+0x618/0x7e4 fs/sysv/balloc.c:113 alloc_branch fs/sysv/itree.c:134 [inline] get_block+0x254/0x1360 fs/sysv/itree.c:253 __block_write_begin_int+0x340/0x13b4 fs/buffer.c:1991 __block_write_begin+0x7c/0xa0 fs/buffer.c:2041 sysv_prepare_chunk+0x3c/0x50 fs/sysv/itree.c:468 sysv_make_empty+0x98/0x500 fs/sysv/dir.c:257 sysv_mkdir+0x88/0x138 fs/sysv/namei.c:130 vfs_mkdir+0x334/0x4e4 fs/namei.c:4106 do_mkdirat+0x220/0x510 fs/namei.c:4131 __do_sys_mkdirat fs/namei.c:4146 [inline] __se_sys_mkdirat fs/namei.c:4144 [inline] __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4144 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 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 physical page: page:000000005d0aa92a refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x138e8b flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000000 dead000000000100 dead000000000122 0000000000000000 raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000f8e8af80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff0000f8e8b000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff0000f8e8b080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff0000f8e8b100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff0000f8e8b180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== syz.7.473: attempt to access beyond end of device loop7: rw=0, sector=6491536, nr_sectors = 2 limit=128 Buffer I/O error on dev loop7, logical block 3245768, async page read syz.7.473: attempt to access beyond end of device loop7: rw=0, sector=6491536, nr_sectors = 2 limit=128 Buffer I/O error on dev loop7, logical block 3245768, async page read