Messages in this thread | | | Date | Wed, 16 Nov 2022 11:49:38 -0800 | Subject | [syzbot] BUG: unable to handle kernel paging request in p9_client_prepare_req | From | syzbot <> |
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Hello,
syzbot found the following issue on:
HEAD commit: 9500fc6e9e60 Merge branch 'for-next/core' into for-kernelci 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=13bdf3f1880000 kernel config: https://syzkaller.appspot.com/x/.config?x=b25c9f218686dd5e dashboard link: https://syzkaller.appspot.com/bug?extid=69c3bf057b7a81f47758 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=17f6d5cd880000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=154f2a45880000
Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1363e60652f7/disk-9500fc6e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/fcc4da811bb6/vmlinux-9500fc6e.xz kernel image: https://storage.googleapis.com/syzbot-assets/0b554298f1fa/Image-9500fc6e.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+69c3bf057b7a81f47758@syzkaller.appspotmail.com
Unable to handle kernel paging request at virtual address bf908d5e7640333a Mem abort info: ESR = 0x0000000096000004 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000004 CM = 0, WnR = 0 [bf908d5e7640333a] address between user and kernel address ranges Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 3084 Comm: syz-executor291 Not tainted 6.1.0-rc5-syzkaller-32269-g9500fc6e9e60 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 pstate: 40400005 (nZcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __kmem_cache_alloc_node+0x17c/0x350 mm/slub.c:3437 lr : slab_pre_alloc_hook mm/slab.h:712 [inline] lr : slab_alloc_node mm/slub.c:3318 [inline] lr : __kmem_cache_alloc_node+0x80/0x350 mm/slub.c:3437 sp : ffff80000ff636c0 x29: ffff80000ff636d0 x28: ffff0000c9848000 x27: 0000000000000000 x26: 0000000000001000 x25: 00000000ffffffff x24: ffff80000bea07bc x23: 0000000000001000 x22: bf908d5e76402b3a x21: 0000000000000000 x20: 0000000000000c40 x19: ffff0000c0001700 x18: 000000000000ba7e x17: 000000000000b67e x16: ffff80000dc18158 x15: ffff0000c9848000 x14: 0000000000000010 x13: 0000000000000000 x12: ffff0000c9848000 x11: 0000000000000001 x10: 0000000000000000 x9 : 0000000000000800 x8 : 00000000000613f9 x7 : ffff8000084c0640 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000061401 x2 : 0000000000000000 x1 : 0000000000000c40 x0 : fffffc00032ed000 Call trace: next_tid mm/slub.c:2349 [inline] slab_alloc_node mm/slub.c:3382 [inline] __kmem_cache_alloc_node+0x17c/0x350 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc+0xb4/0x140 mm/slab_common.c:968 kmalloc include/linux/slab.h:558 [inline] p9_fcall_init net/9p/client.c:228 [inline] p9_tag_alloc net/9p/client.c:293 [inline] p9_client_prepare_req+0x2b0/0x53c net/9p/client.c:631 p9_client_rpc+0xbc/0x548 net/9p/client.c:678 p9_client_flush+0x118/0x1b0 net/9p/client.c:596 p9_client_rpc+0x4cc/0x548 net/9p/client.c:724 p9_client_create+0x4d8/0x758 net/9p/client.c:1015 v9fs_session_init+0xa4/0x9f0 fs/9p/v9fs.c:408 v9fs_mount+0x6c/0x568 fs/9p/vfs_super.c:126 legacy_get_tree+0x30/0x74 fs/fs_context.c:610 vfs_get_tree+0x40/0x140 fs/super.c:1531 do_new_mount+0x1dc/0x4e4 fs/namespace.c:3040 path_mount+0x358/0x890 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __arm64_sys_mount+0x2c4/0x3c4 fs/namespace.c:3568 __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+0x190/0x194 arch/arm64/kernel/entry.S:584 Code: 54000ee1 34000eeb b9402a69 91002103 (f8696ada) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 54000ee1 b.ne 0x1dc // b.any 4: 34000eeb cbz w11, 0x1e0 8: b9402a69 ldr w9, [x19, #40] c: 91002103 add x3, x8, #0x8 * 10: f8696ada ldr x26, [x22, x9] <-- trapping instruction
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