Hello, syzbot found the following issue on: HEAD commit: f0c4d9fc9cc9 Linux 6.1-rc4 git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=1325f951880000 kernel config: https://syzkaller.appspot.com/x/.config?x=ff27f0c8b406726e dashboard link: https://syzkaller.appspot.com/bug?extid=baa30b3f0af34d3b3832 compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12c3890e880000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15d5fede880000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/92c7e839ac32/disk-f0c4d9fc.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b7bedbc08fb4/vmlinux-f0c4d9fc.xz kernel image: https://storage.googleapis.com/syzbot-assets/3fe25e2dfdb7/Image-f0c4d9fc.gz.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/e08ff430eaf4/mount_3.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+baa30b3f0af34d3b3832@xxxxxxxxxxxxxxxxxxxxxxxxx loop0: detected capacity change from 0 to 79 Unable to handle kernel paging request at virtual address ffff8001f1dad000 Mem abort info: ESR = 0x0000000096000005 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x05: level 1 translation fault Data abort info: ISV = 0, ISS = 0x00000005 CM = 0, WnR = 0 swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000001c5630000 [ffff8001f1dad000] pgd=100000023ffff003, p4d=100000023ffff003, pud=0000000000000000 Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 3024 Comm: syz-executor176 Not tainted 6.1.0-rc4-syzkaller-31833-gf0c4d9fc9cc9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __percpu_add_case_32 arch/arm64/include/asm/percpu.h:127 [inline] pc : percpu_up_read include/linux/percpu-rwsem.h:106 [inline] pc : __sb_end_write include/linux/fs.h:1821 [inline] pc : sb_end_write+0xac/0x22c include/linux/fs.h:1853 lr : rcu_sync_is_idle include/linux/rcu_sync.h:36 [inline] lr : percpu_up_read include/linux/percpu-rwsem.h:105 [inline] lr : __sb_end_write include/linux/fs.h:1821 [inline] lr : sb_end_write+0x84/0x22c include/linux/fs.h:1853 sp : ffff800012b9bc00 x29: ffff800012b9bc00 x28: ffff0000cb107888 x27: ffff80000d3182f0 x26: 00000000fffffffb x25: 0000000000000021 x24: 0000000000000001 x23: 0000000020000080 x22: 0000000020000180 x21: ffff0000c6540000 x20: 0000000000000000 x19: ffff0000c97e7000 x18: 00000000000000c0 x17: ffff80000dcec198 x16: ffff80000db2a158 x15: ffff0000c6540000 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff0000c6540000 x11: ff808000085ff1b0 x10: 0000000000000000 x9 : 00000000ffffffff x8 : ffff8001f1dad000 x7 : ffff8000095f3074 x6 : 0000000000000000 x5 : 0000000000000080 x4 : ffff0001feff2950 x3 : 0000000000002bb9 x2 : ffff0000c9558000 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: __sb_end_write include/linux/fs.h:1821 [inline] sb_end_write+0xac/0x22c include/linux/fs.h:1853 mnt_drop_write+0x28/0x38 fs/namespace.c:471 path_setxattr+0x36c/0x414 fs/xattr.c:638 __do_sys_setxattr fs/xattr.c:652 [inline] __se_sys_setxattr fs/xattr.c:648 [inline] __arm64_sys_setxattr+0x2c/0x40 fs/xattr.c:648 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 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:581 Code: f941fe68 d538d089 8b080128 12800009 (b829011f) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: f941fe68 ldr x8, [x19, #1016] 4: d538d089 mrs x9, tpidr_el1 8: 8b080128 add x8, x9, x8 c: 12800009 mov w9, #0xffffffff // #-1 * 10: b829011f stadd w9, [x8] <-- trapping instruction --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
