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With >>> 4K pages, creating a buffer of more than INT_MAX / 8 pages (about 1 >> TB >>> of pinned memory) now makes the two per-page pointer arrays in >>> init_udmabuf() exceed what kvmalloc() can handle: kvmalloc() warns >> and >>> fails when the requested size exceeds INT_MAX bytes >> (WARN_ON_ONCE in >>> __kvmalloc_node_noprof), which is trivially triggerable from >>> unprivileged users through the UDMABUF_CREATE ioctls: >>> >>> WARNING: CPU: 0 PID: 412 at mm/slub.c:7021 >> __kvmalloc_node_noprof >>> Call Trace: >>> udmabuf_create >>> udmabuf_ioctl_create_list >>> >>> Restore a reasonable default limit of 256 MB, which is the value >>> proposed in the RFC discussion that led to commit 44e9eb5a7621 >> >> That is way to low, we want to allocate multiple gigabytes using that >> API. > I am wondering, what is the use-case that would require pinning multiple > Gigabytes of memory via udmabuf? We use that as replacement for driver allocated memory on acceleration devices. Regards, Christian. > > Thanks, > Vivek > >> >> Please make that (((INT_MAX / sizeof(struct folio *)) - 1) >> 20) << >> PAGE_SHIFT. >> >> That should allow to allocate a bit below 1TiB again without triggering >> the issue. >> >> Regards, >> Christian. >> >>> ("dma-buf/udmabuf: Disable the size limit by default") and >> comfortably >>> covers the 8K video use cases cited there, while keeping the >>> kvmalloc() request far below its threshold. The limit remains >>> runtime-tunable via the size_limit_mb module parameter for setups >>> that need more. >>> >>> Fixes: 44e9eb5a7621 ("dma-buf/udmabuf: Disable the size limit by >> default") >>> Assisted-by: OpenCode:DeepSeek-V4-Flash >>> Signed-off-by: Jiakai Xu >>> --- >>> V1 -> V2: >>> - Instead of adding a pgcnt check in udmabuf_create(), restore a >>> reasonable default size limit (256 MB), as suggested by Christian >>> König. >>> - Drop the second Fixes tag; the regression is solely due to >>> 44e9eb5a7621. >>> - Drop the "Cc: stable" tag; 44e9eb5a7621 is only in v7.3-rc1 and has >>> not shipped in any released kernel yet. >>> >>> V1: https://lore.kernel.org/all/20260918013434.1849135-1- >> xujiakai24@mails.ucas.ac.cn/ >>> --- >>> drivers/dma-buf/udmabuf.c | 4 ++-- >>> 1 file changed, 2 insertions(+), 2 deletions(-) >>> >>> diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c >>> index df6dd00462423..4d90c2cb14225 100644 >>> --- a/drivers/dma-buf/udmabuf.c >>> +++ b/drivers/dma-buf/udmabuf.c >>> @@ -20,9 +20,9 @@ static int list_limit = 1024; >>> module_param(list_limit, int, 0644); >>> MODULE_PARM_DESC(list_limit, "udmabuf_create_list->count limit. >> Default is 1024."); >>> >>> -static int size_limit_mb = INT_MAX; >>> +static int size_limit_mb = 256; >>> module_param(size_limit_mb, int, 0644); >>> -MODULE_PARM_DESC(size_limit_mb, "Max size of a dmabuf, in >> megabytes. Default is INT_MAX."); >>> +MODULE_PARM_DESC(size_limit_mb, "Max size of a dmabuf, in >> megabytes. Default is 256."); >>> >>> struct udmabuf { >>> pgoff_t pagecount; >>> -- >>> 2.34.1 >>> >>> -- >>> Below is the crash report: >>> ------------[ cut here ]------------ >>> WARNING: mm/slub.c:7013 at __kvmalloc_node_noprof+0x516/0x5d0 >> home/zzzrrll/tmp/kf_src/linux-7.3-rc2/mm/slub.c:7013, CPU#0: >> syz.5.27938/167363 >>> Modules linked in: >>> CPU: 0 UID: 0 PID: 167363 Comm: syz.5.27938 Tainted: G W L >> 7.3.0-rc2 #1 PREEMPT(full) >>> Tainted: [W]=WARN, [L]=SOFTLOCKUP >>> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0- >> 1 04/01/2014 >>> RIP: 0010:__kvmalloc_node_noprof+0x516/0x5d0 >> home/zzzrrll/tmp/kf_src/linux-7.3-rc2/mm/slub.c:7013 >>> Code: 05 bf fa 2d 08 49 8b 0f c6 04 08 00 65 48 ff 0d 90 fa 2d 08 0f 85 >> 4c fd ff ff e8 05 43 8c ff e9 42 fd ff ff e8 9b 86 0e 04 90 <0f> 0b 90 31 db >> e9 d2 fe ff ff f3 0f 1e fa 65 8b 05 8d fa 2d 08 89 >>> RSP: 0018:ffffc90002bc3cf8 EFLAGS: 00010246 >>> RAX: 0000000000000100 RBX: 0000000000000000 RCX: >> 0000008000000000 >>> RDX: 0000008000000000 RSI: 0000000000000000 RDI: ffffffff835e3226 >>> RBP: 00000000ffffffff R08: 00000000000028c0 R09: 00000000ffffffff >>> R10: 0000000000000006 R11: 0000000000000002 R12: >> 0000008000000000 >>> R13: 00000000000028c0 R14: 0000001000000000 R15: >> 0000008000000000 >>> FS: 00007fc89ae45640(0000) GS:ffff8880f3de4000(0000) >> knlGS:0000000000000000 >>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >>> CR2: 000000110c2ff305 CR3: 000000002b3d4000 CR4: >> 0000000000752ef0 >>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: >> 0000000000006000 >>> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: >> 0000000000000400 >>> PKRU: 80000000 >>> Call Trace: >>> >>> init_udmabuf home/zzzrrll/tmp/kf_src/linux-7.3-rc2/drivers/dma- >> buf/udmabuf.c:193 [inline] >>> udmabuf_create+0x1b6/0x750 home/zzzrrll/tmp/kf_src/linux-7.3- >> rc2/drivers/dma-buf/udmabuf.c:386 >>> udmabuf_ioctl_create home/zzzrrll/tmp/kf_src/linux-7.3- >> rc2/drivers/dma-buf/udmabuf.c:465 [inline] >>> udmabuf_ioctl+0x132/0x1d0 home/zzzrrll/tmp/kf_src/linux-7.3- >> rc2/drivers/dma-buf/udmabuf.c:496 >>> vfs_ioctl home/zzzrrll/tmp/kf_src/linux-7.3-rc2/fs/ioctl.c:51 [inline] >>> __do_sys_ioctl home/zzzrrll/tmp/kf_src/linux-7.3-rc2/fs/ioctl.c:597 >> [inline] >>> __se_sys_ioctl+0xbc/0x130 home/zzzrrll/tmp/kf_src/linux-7.3- >> rc2/fs/ioctl.c:583 >>> do_syscall_x64 home/zzzrrll/tmp/kf_src/linux-7.3- >> rc2/arch/x86/entry/syscall_64.c:61 [inline] >>> do_syscall_64+0x12b/0x350 home/zzzrrll/tmp/kf_src/linux-7.3- >> rc2/arch/x86/entry/syscall_64.c:84 >>> entry_SYSCALL_64_after_hwframe+0x77/0x7f >>> RIP: 0033:0x590d6d >>> Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 48 89 f8 48 89 f7 48 >> 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff >> 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 >>> RSP: 002b:00007fc89ae44fd8 EFLAGS: 00000216 ORIG_RAX: >> 0000000000000010 >>> RAX: ffffffffffffffda RBX: 0000000000611e7f RCX: 0000000000590d6d >>> RDX: 00002000000023c0 RSI: 0000000040187542 RDI: >> 000000000000000a >>> RBP: 00007fc89ae45010 R08: 0000000000000000 R09: >> 0000000000000000 >>> R10: 0000000000000000 R11: 0000000000000216 R12: >> 00007fc89ae45640 >>> R13: 000000000000000b R14: 0000000000528d40 R15: >> 00007fc89ae25000 >>> >>> ---[ end trace 0000000000000000 ]--- >>> --- >>> >