Re: [syzbot] [mm?] BUG: stack guard page was hit in compat_sys_open

From: Dmitry Vyukov
Date: Mon Oct 14 2024 - 04:27:23 EST

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On Mon, 14 Oct 2024 at 08:01, syzbot
<syzbot+0e1748603cc9f2dfc87d@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 27cc6fdf7201 Merge tag 'linux_kselftest-fixes-6.12-rc2' of..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=13043307980000
> kernel config: https://syzkaller.appspot.com/x/.config?x=e3e4d87a80ed4297
> dashboard link: https://syzkaller.appspot.com/bug?extid=0e1748603cc9f2dfc87d
> compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> userspace arch: i386
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> Downloadable assets:
> disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-27cc6fdf.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/ae2f7d656e32/vmlinux-27cc6fdf.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/1b06a62cc1e5/bzImage-27cc6fdf.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+0e1748603cc9f2dfc87d@xxxxxxxxxxxxxxxxxxxxxxxxx
>
> BUG: TASK stack guard page was hit at ffffc90002b3ffb8 (stack is ffffc90002b40000..ffffc90002b48000)
> Oops: stack guard page: 0000 [#1] PREEMPT SMP KASAN NOPTI
> CPU: 0 UID: 0 PID: 12425 Comm: syz.2.2179 Not tainted 6.12.0-rc1-syzkaller-00306-g27cc6fdf7201 #0
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
> RIP: 0010:mark_lock+0x25/0xc60 kernel/locking/lockdep.c:4686
> Code: 90 90 90 90 90 55 48 89 e5 41 57 41 56 41 89 d6 48 ba 00 00 00 00 00 fc ff df 41 55 41 54 53 48 83 e4 f0 48 81 ec 10 01 00 00 <48> c7 44 24 30 b3 8a b5 41 48 8d 44 24 30 48 c7 44 24 38 38 51 57
> RSP: 0018:ffffc90002b3ffc0 EFLAGS: 00010086
> RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000003
> RDX: dffffc0000000000 RSI: ffff888021edaf98 RDI: ffff888021eda440
> RBP: ffffc90002b40100 R08: 0000000000000000 R09: 0000000000000006
> R10: ffffffff9698ad37 R11: 0000000000000002 R12: dffffc0000000000
> R13: ffff888021edaf98 R14: 0000000000000008 R15: ffff888021eda440
> FS: 0000000000000000(0000) GS:ffff88802b400000(0063) knlGS:00000000f56f6b40
> CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
> CR2: ffffc90002b3ffb8 CR3: 000000005f61e000 CR4: 0000000000352ef0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> <#DF>
> </#DF>
> <TASK>
> mark_usage kernel/locking/lockdep.c:4646 [inline]
> __lock_acquire+0x906/0x3ce0 kernel/locking/lockdep.c:5156
> lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5825
> rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
> rcu_read_lock include/linux/rcupdate.h:849 [inline]
> page_ext_get+0x3a/0x310 mm/page_ext.c:525
> __set_page_owner+0x9a/0x790 mm/page_owner.c:322
> set_page_owner include/linux/page_owner.h:32 [inline]
> post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1537
> prep_new_page mm/page_alloc.c:1545 [inline]
> get_page_from_freelist+0x101e/0x3070 mm/page_alloc.c:3457
> __alloc_pages_noprof+0x223/0x25c0 mm/page_alloc.c:4733
> alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265
> alloc_slab_page mm/slub.c:2412 [inline]
> allocate_slab mm/slub.c:2578 [inline]
> new_slab+0x2ba/0x3f0 mm/slub.c:2631
> ___slab_alloc+0xd1d/0x16f0 mm/slub.c:3818
> __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3908
> __slab_alloc_node mm/slub.c:3961 [inline]
> slab_alloc_node mm/slub.c:4122 [inline]
> kmem_cache_alloc_noprof+0x2ae/0x2f0 mm/slub.c:4141
> p9_tag_alloc+0x9c/0x870 net/9p/client.c:281
> p9_client_prepare_req+0x19f/0x4d0 net/9p/client.c:644
> p9_client_zc_rpc.constprop.0+0x105/0x880 net/9p/client.c:793
> p9_client_read_once+0x443/0x820 net/9p/client.c:1560
> p9_client_read+0x13f/0x1b0 net/9p/client.c:1524
> v9fs_issue_read+0x115/0x310 fs/9p/vfs_addr.c:74
> netfs_retry_read_subrequests fs/netfs/read_retry.c:60 [inline]
> netfs_retry_reads+0x153a/0x1d00 fs/netfs/read_retry.c:232

+netfs maintainers, looks like infinite recursion in netfs code

#syz set subsystems: netfs

> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_retry_reads+0x155e/0x1d00 fs/netfs/read_retry.c:235
> netfs_rreq_assess+0x5d3/0x870 fs/netfs/read_collect.c:369
> netfs_rreq_terminated+0xe5/0x110 fs/netfs/read_collect.c:405
> netfs_dispatch_unbuffered_reads fs/netfs/direct_read.c:103 [inline]
> netfs_unbuffered_read fs/netfs/direct_read.c:127 [inline]
> netfs_unbuffered_read_iter_locked+0x12f6/0x19b0 fs/netfs/direct_read.c:221
> netfs_unbuffered_read_iter+0xc5/0x100 fs/netfs/direct_read.c:256
> v9fs_file_read_iter+0xbf/0x100 fs/9p/vfs_file.c:361
> __kernel_read+0x3f1/0xb50 fs/read_write.c:527
> integrity_kernel_read+0x7f/0xb0 security/integrity/iint.c:28
> ima_calc_file_hash_tfm+0x2c9/0x3e0 security/integrity/ima/ima_crypto.c:480
> ima_calc_file_shash security/integrity/ima/ima_crypto.c:511 [inline]
> ima_calc_file_hash+0x1ba/0x490 security/integrity/ima/ima_crypto.c:568
> ima_collect_measurement+0x8a7/0xa10 security/integrity/ima/ima_api.c:293
> process_measurement+0x1271/0x2370 security/integrity/ima/ima_main.c:372
> ima_file_check+0xc1/0x110 security/integrity/ima/ima_main.c:572
> security_file_post_open+0x8e/0x210 security/security.c:3127
> do_open fs/namei.c:3776 [inline]
> path_openat+0x1419/0x2d60 fs/namei.c:3933
> do_filp_open+0x1dc/0x430 fs/namei.c:3960
> do_sys_openat2+0x17a/0x1e0 fs/open.c:1415
> do_sys_open fs/open.c:1430 [inline]
> __do_compat_sys_open fs/open.c:1481 [inline]
> __se_compat_sys_open fs/open.c:1479 [inline]
> __ia32_compat_sys_open+0x147/0x1e0 fs/open.c:1479
> do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
> __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
> do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
> entry_SYSENTER_compat_after_hwframe+0x84/0x8e
> RIP: 0023:0xf740e579
> Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
> RSP: 002b:00000000f56f656c EFLAGS: 00000296 ORIG_RAX: 0000000000000005
> RAX: ffffffffffffffda RBX: 0000000020000240 RCX: 0000000000000b00
> RDX: 0000000000000008 RSI: 0000000000000000 RDI: 0000000000000000
> RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:mark_lock+0x25/0xc60 kernel/locking/lockdep.c:4686
> Code: 90 90 90 90 90 55 48 89 e5 41 57 41 56 41 89 d6 48 ba 00 00 00 00 00 fc ff df 41 55 41 54 53 48 83 e4 f0 48 81 ec 10 01 00 00 <48> c7 44 24 30 b3 8a b5 41 48 8d 44 24 30 48 c7 44 24 38 38 51 57
> RSP: 0018:ffffc90002b3ffc0 EFLAGS: 00010086
> RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000003
> RDX: dffffc0000000000 RSI: ffff888021edaf98 RDI: ffff888021eda440
> RBP: ffffc90002b40100 R08: 0000000000000000 R09: 0000000000000006
> R10: ffffffff9698ad37 R11: 0000000000000002 R12: dffffc0000000000
> R13: ffff888021edaf98 R14: 0000000000000008 R15: ffff888021eda440
> FS: 0000000000000000(0000) GS:ffff88802b400000(0063) knlGS:00000000f56f6b40
> CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
> CR2: ffffc90002b3ffb8 CR3: 000000005f61e000 CR4: 0000000000352ef0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> ----------------
> Code disassembly (best guess):
> 0: 90 nop
> 1: 90 nop
> 2: 90 nop
> 3: 90 nop
> 4: 90 nop
> 5: 55 push %rbp
> 6: 48 89 e5 mov %rsp,%rbp
> 9: 41 57 push %r15
> b: 41 56 push %r14
> d: 41 89 d6 mov %edx,%r14d
> 10: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx
> 17: fc ff df
> 1a: 41 55 push %r13
> 1c: 41 54 push %r12
> 1e: 53 push %rbx
> 1f: 48 83 e4 f0 and $0xfffffffffffffff0,%rsp
> 23: 48 81 ec 10 01 00 00 sub $0x110,%rsp
> * 2a: 48 c7 44 24 30 b3 8a movq $0x41b58ab3,0x30(%rsp) <-- trapping instruction
> 31: b5 41
> 33: 48 8d 44 24 30 lea 0x30(%rsp),%rax
> 38: 48 rex.W
> 39: c7 .byte 0xc7
> 3a: 44 24 38 rex.R and $0x38,%al
> 3d: 38 51 57 cmp %dl,0x57(%rcx)
>
>
> ---
> This report is generated by a bot. It may contain errors.
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> syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx.
>
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>
> If the report is already addressed, let syzbot know by replying with:
> #syz fix: exact-commit-title
>
> If you want to overwrite report's subsystems, reply with:
> #syz set subsystems: new-subsystem
> (See the list of subsystem names on the web dashboard)
>
> If the report is a duplicate of another one, reply with:
> #syz dup: exact-subject-of-another-report
>
> If you want to undo deduplication, reply with:
> #syz undup
>
> --
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